Create LICENSE

patch test bug incorrectly oriented square brackets
stub working parse of or Operation on sets; phoneList being read as setAlias
2021-04-14 20:34:07 -04:00 · 2020-05-21 19:36:43 -07:00 · 2020-05-21 19:02:18 -07:00 · 2020-05-18 22:37:19 -07:00 · 2020-05-18 22:02:00 -07:00 · 2020-05-09 22:18:07 -07:00
54 changed files with 4638 additions and 230 deletions
--- a/21
+++ b/21
@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2021 Sorrel
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
--- a/README.md
+++ b/README.md
@ -1,6 +1,6 @@
 # Feature Change Applier

-[Try the app!]([https://](https://sorrelbri.github.io/feature-change-applier/))
+[Try the app!](https://sorrelbri.github.io/feature-change-applier/)

 [Inspired by the Zompist Sound Change Applier 2](https://www.zompist.com/sca2.html)

@ -14,6 +14,12 @@ Features:
 - multi-character phone support
 - comparative runs for multiple rule sets

+## What is LATL?
+
+[Read the specification](/src/utils/latl/README.md)
+
+LATL is a JavaScript targeting compiled language for doing linguistic analysis and transformations.
+
 ## How do I use FCA?

 An FCA run requires the user to define three parameters:
@ -30,7 +36,7 @@ FCA does not currently support suprasegmentals by default, however features can
 For example:
 - For tonemes, use IPA tone markers as in `ma˨˩˦` (马)
 - For phonetic length, use IPA length markers as in `ħaːsin` (حَاسِن‎)
- For stress or syllabic breaks, however `ˈɡʊd.nɪs` may result in unpredictable behavior and is best avoided.
+- For stress or syllabic breaks, however `ˈɡʊd.nɪs` may result in unpredictable behavior and is best avoided.  
 See below for defining these features in the feature set.

 #### Future Changes to the Input Lexicon
--- a/grammar.js
+++ b/grammar.js
--- a/package-lock.json
+++ b/package-lock.json
@ -1032,9 +1032,9 @@
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+      "version": "8.5.1",
+      "resolved": "https://registry.npmjs.org/@hapi/hoek/-/hoek-8.5.1.tgz",
+      "integrity": "sha512-yN7kbciD87WzLGc5539Tn0sApjyiGHAJgKvG9W8C7O+6c7qmoQMfVs0W4bX17eqz6C78QJqqFrtgdK5EWf6Qow=="
    },
    "@hapi/joi": {
      "version": "15.1.1",
@ -4857,6 +4857,11 @@
        }
      }
    },
+    "discontinuous-range": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/discontinuous-range/-/discontinuous-range-1.0.0.tgz",
+      "integrity": "sha1-44Mx8IRLukm5qctxx3FYWqsbxlo="
+    },
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      "version": "1.0.0",
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@ -6594,12 +6599,12 @@
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+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/globule/-/globule-1.3.1.tgz",
+      "integrity": "sha512-OVyWOHgw29yosRHCHo7NncwR1hW5ew0W/UrvtwvjefVJeQ26q4/8r8FmPsSF1hJ93IgWkyv16pCTz6WblMzm/g==",
      "requires": {
        "glob": "~7.1.1",
-        "lodash": "~4.17.10",
+        "lodash": "~4.17.12",
        "minimatch": "~3.0.2"
      }
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@ -6613,6 +6618,11 @@
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      "integrity": "sha1-8QdIy+dq+WS3yWyTxrzCivEgwIE="
    },
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+      "resolved": "https://registry.npmjs.org/gud/-/gud-1.0.0.tgz",
+      "integrity": "sha512-zGEOVKFM5sVPPrYs7J5/hYEw2Pof8KCyOwyhG8sAF26mCAeUFAcYPu1mwB7hhpIP29zOIBaDqwuHdLp0jvZXjw=="
+    },
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@ -6759,6 +6769,19 @@
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    },
+    "history": {
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+      "resolved": "https://registry.npmjs.org/history/-/history-4.10.1.tgz",
+      "integrity": "sha512-36nwAD620w12kuzPAsyINPWJqlNbij+hpK1k9XRloDtym8mxzGYl2c17LnV6IAGB2Dmg4tEa7G7DlawS0+qjew==",
+      "requires": {
+        "@babel/runtime": "^7.1.2",
+        "loose-envify": "^1.2.0",
+        "resolve-pathname": "^3.0.0",
+        "tiny-invariant": "^1.0.2",
+        "tiny-warning": "^1.0.0",
+        "value-equal": "^1.0.1"
+      }
+    },
    "hmac-drbg": {
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      "resolved": "https://registry.npmjs.org/hmac-drbg/-/hmac-drbg-1.0.1.tgz",
@ -6769,6 +6792,14 @@
        "minimalistic-crypto-utils": "^1.0.1"
      }
    },
+    "hoist-non-react-statics": {
+      "version": "3.3.2",
+      "resolved": "https://registry.npmjs.org/hoist-non-react-statics/-/hoist-non-react-statics-3.3.2.tgz",
+      "integrity": "sha512-/gGivxi8JPKWNm/W0jSmzcMPpfpPLc3dY/6GxhX2hQ9iGj3aDfklV4ET7NjKpSinLpJ5vafa9iiGIEZg10SfBw==",
+      "requires": {
+        "react-is": "^16.7.0"
+      }
+    },
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      "resolved": "https://registry.npmjs.org/hosted-git-info/-/hosted-git-info-2.8.5.tgz",
@ -7314,12 +7345,9 @@
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-      "integrity": "sha1-zGZ3aVYCvlUO8R6LSqYwU0K20Ko=",
-      "requires": {
-        "number-is-nan": "^1.0.0"
-      }
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/is-finite/-/is-finite-1.1.0.tgz",
+      "integrity": "sha512-cdyMtqX/BOqqNBBiKlIVkytNHm49MtMlYyn1zxzvJKWmFMlGzm+ry5BBfYyeY9YmNKbRSo/o7OX9w9ale0wg3w=="
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    "is-fullwidth-code-point": {
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@ -9228,9 +9256,9 @@
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-      "version": "2.5.1",
-      "resolved": "https://registry.npmjs.org/js-base64/-/js-base64-2.5.1.tgz",
-      "integrity": "sha512-M7kLczedRMYX4L8Mdh4MzyAMM9O5osx+4FcOQuTvr3A9F2D9S5JXheN0ewNbrvK2UatkTRhL5ejGmGSjNMiZuw=="
+      "version": "2.5.2",
+      "resolved": "https://registry.npmjs.org/js-base64/-/js-base64-2.5.2.tgz",
+      "integrity": "sha512-Vg8czh0Q7sFBSUMWWArX/miJeBWYBPpdU/3M/DKSaekLMqrqVPaedp+5mZhie/r0lgrcaYBfwXatEew6gwgiQQ=="
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@ -9825,6 +9853,16 @@
      "integrity": "sha1-z8RcN+nsDY8KDsPdTvf3w6vjklY=",
      "dev": true
    },
+    "mini-create-react-context": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/mini-create-react-context/-/mini-create-react-context-0.3.2.tgz",
+      "integrity": "sha512-2v+OeetEyliMt5VHMXsBhABoJ0/M4RCe7fatd/fBy6SMiKazUSEt3gxxypfnk2SHMkdBYvorHRoQxuGoiwbzAw==",
+      "requires": {
+        "@babel/runtime": "^7.4.0",
+        "gud": "^1.0.0",
+        "tiny-warning": "^1.0.2"
+      }
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@ -9977,6 +10015,11 @@
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+    "moo": {
+      "version": "0.5.1",
+      "resolved": "https://registry.npmjs.org/moo/-/moo-0.5.1.tgz",
+      "integrity": "sha512-I1mnb5xn4fO80BH9BLcF0yLypy2UKl+Cb01Fu0hJRkJjlCRtxZMWkTdAtDd5ZqCOxtCkhmRwyI57vWT+1iZ67w=="
+    },
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@ -10049,6 +10092,18 @@
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      "integrity": "sha1-Sr6/7tdUHywnrPspvbvRXI1bpPc="
    },
+    "nearley": {
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+      "resolved": "https://registry.npmjs.org/nearley/-/nearley-2.19.1.tgz",
+      "integrity": "sha512-xq47GIUGXxU9vQg7g/y1o1xuKnkO7ev4nRWqftmQrLkfnE/FjRqDaGOUakM8XHPn/6pW3bGjU2wgoJyId90rqg==",
+      "requires": {
+        "commander": "^2.19.0",
+        "moo": "^0.5.0",
+        "railroad-diagrams": "^1.0.0",
+        "randexp": "0.4.6",
+        "semver": "^5.4.1"
+      }
+    },
    "negotiator": {
      "version": "0.6.2",
      "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.2.tgz",
@ -10196,9 +10251,9 @@
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-      "version": "4.13.0",
-      "resolved": "https://registry.npmjs.org/node-sass/-/node-sass-4.13.0.tgz",
-      "integrity": "sha512-W1XBrvoJ1dy7VsvTAS5q1V45lREbTlZQqFbiHb3R3OTTCma0XBtuG6xZ6Z4506nR4lmHPTqVRwxT6KgtWC97CA==",
+      "version": "4.13.1",
+      "resolved": "https://registry.npmjs.org/node-sass/-/node-sass-4.13.1.tgz",
+      "integrity": "sha512-TTWFx+ZhyDx1Biiez2nB0L3YrCZ/8oHagaDalbuBSlqXgUPsdkUSzJsVxeDO9LtPB49+Fh3WQl3slABo6AotNw==",
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        "chalk": "^1.1.1",
@ -12136,6 +12191,20 @@
        "performance-now": "^2.1.0"
      }
    },
+    "railroad-diagrams": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/railroad-diagrams/-/railroad-diagrams-1.0.0.tgz",
+      "integrity": "sha1-635iZ1SN3t+4mcG5Dlc3RVnN234="
+    },
+    "randexp": {
+      "version": "0.4.6",
+      "resolved": "https://registry.npmjs.org/randexp/-/randexp-0.4.6.tgz",
+      "integrity": "sha512-80WNmd9DA0tmZrw9qQa62GPPWfuXJknrmVmLcxvq4uZBdYqb1wYoKTmnlGUchvVWe0XiLupYkBoXVOxz3C8DYQ==",
+      "requires": {
+        "discontinuous-range": "1.0.0",
+        "ret": "~0.1.10"
+      }
+    },
    "randombytes": {
      "version": "2.1.0",
      "resolved": "https://registry.npmjs.org/randombytes/-/randombytes-2.1.0.tgz",
@ -12421,6 +12490,52 @@
      "resolved": "https://registry.npmjs.org/react-is/-/react-is-16.12.0.tgz",
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    },
+    "react-router": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/react-router/-/react-router-5.1.2.tgz",
+      "integrity": "sha512-yjEuMFy1ONK246B+rsa0cUam5OeAQ8pyclRDgpxuSCrAlJ1qN9uZ5IgyKC7gQg0w8OM50NXHEegPh/ks9YuR2A==",
+      "requires": {
+        "@babel/runtime": "^7.1.2",
+        "history": "^4.9.0",
+        "hoist-non-react-statics": "^3.1.0",
+        "loose-envify": "^1.3.1",
+        "mini-create-react-context": "^0.3.0",
+        "path-to-regexp": "^1.7.0",
+        "prop-types": "^15.6.2",
+        "react-is": "^16.6.0",
+        "tiny-invariant": "^1.0.2",
+        "tiny-warning": "^1.0.0"
+      },
+      "dependencies": {
+        "isarray": {
+          "version": "0.0.1",
+          "resolved": "https://registry.npmjs.org/isarray/-/isarray-0.0.1.tgz",
+          "integrity": "sha1-ihis/Kmo9Bd+Cav8YDiTmwXR7t8="
+        },
+        "path-to-regexp": {
+          "version": "1.8.0",
+          "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-1.8.0.tgz",
+          "integrity": "sha512-n43JRhlUKUAlibEJhPeir1ncUID16QnEjNpwzNdO3Lm4ywrBpBZ5oLD0I6br9evr1Y9JTqwRtAh7JLoOzAQdVA==",
+          "requires": {
+            "isarray": "0.0.1"
+          }
+        }
+      }
+    },
+    "react-router-dom": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/react-router-dom/-/react-router-dom-5.1.2.tgz",
+      "integrity": "sha512-7BPHAaIwWpZS074UKaw1FjVdZBSVWEk8IuDXdB+OkLb8vd/WRQIpA4ag9WQk61aEfQs47wHyjWUoUGGZxpQXew==",
+      "requires": {
+        "@babel/runtime": "^7.1.2",
+        "history": "^4.9.0",
+        "loose-envify": "^1.3.1",
+        "prop-types": "^15.6.2",
+        "react-router": "5.1.2",
+        "tiny-invariant": "^1.0.2",
+        "tiny-warning": "^1.0.0"
+      }
+    },
    "react-scripts": {
      "version": "3.3.0",
      "resolved": "https://registry.npmjs.org/react-scripts/-/react-scripts-3.3.0.tgz",
@ -12836,6 +12951,11 @@
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      "integrity": "sha1-six699nWiBvItuZTM17rywoYh0g="
    },
+    "resolve-pathname": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/resolve-pathname/-/resolve-pathname-3.0.0.tgz",
+      "integrity": "sha512-C7rARubxI8bXFNB/hqcp/4iUeIXJhJZvFPFPiSPRnhU5UPxzMFIl+2E6yY6c4k9giDJAhtV+enfA+G89N6Csng=="
+    },
    "resolve-url": {
      "version": "0.2.1",
      "resolved": "https://registry.npmjs.org/resolve-url/-/resolve-url-0.2.1.tgz",
@ -14324,6 +14444,16 @@
      "resolved": "https://registry.npmjs.org/timsort/-/timsort-0.3.0.tgz",
      "integrity": "sha1-QFQRqOfmM5/mTbmiNN4R3DHgK9Q="
    },
+    "tiny-invariant": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/tiny-invariant/-/tiny-invariant-1.1.0.tgz",
+      "integrity": "sha512-ytxQvrb1cPc9WBEI/HSeYYoGD0kWnGEOR8RY6KomWLBVhqz0RgTwVO9dLrGz7dC+nN9llyI7OKAgRq8Vq4ZBSw=="
+    },
+    "tiny-warning": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/tiny-warning/-/tiny-warning-1.0.3.tgz",
+      "integrity": "sha512-lBN9zLN/oAf68o3zNXYrdCt1kP8WsiGW8Oo2ka41b2IM5JL/S1CTyX1rW0mb/zSuJun0ZUrDxx4sqvYS2FWzPA=="
+    },
    "tmp": {
      "version": "0.0.33",
      "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.33.tgz",
@ -14747,6 +14877,11 @@
        "spdx-expression-parse": "^3.0.0"
      }
    },
+    "value-equal": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/value-equal/-/value-equal-1.0.1.tgz",
+      "integrity": "sha512-NOJ6JZCAWr0zlxZt+xqCHNTEKOsrks2HQd4MqhP1qy4z1SkbEP467eNx6TgDKXMvUOb+OENfJCZwM+16n7fRfw=="
+    },
    "vary": {
      "version": "1.1.2",
      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
--- a/package.json
+++ b/package.json
@ -7,13 +7,18 @@
    "flow-bin": "^0.113.0",
    "gh-pages": "^2.2.0",
    "local-storage": "^2.0.0",
-    "node-sass": "^4.13.0",
+    "moo": "^0.5.1",
+    "nearley": "^2.19.1",
+    "node-sass": "^4.13.1",
    "react": "^16.12.0",
    "react-dom": "^16.12.0",
+    "react-router-dom": "^5.1.2",
    "react-scripts": "^3.3.0"
  },
  "scripts": {
    "start": "react-scripts start",
+    "compile-grammar": "nearleyc src/utils/latl/grammar.ne -o src/utils/latl/grammar.js",
+    "test-grammar": "nearley-test src/utils/latl/grammar.js --input",
    "flow": "flow",
    "build": "react-scripts build",
    "test": "react-scripts test",
--- a/public/assets/Screen
+++ b/public/assets/Screen
--- a/public/assets/Screen
+++ b/public/assets/Screen
--- a/public/assets/Screen
+++ b/public/assets/Screen
--- a/public/assets/Screen
+++ b/public/assets/Screen
--- a/public/assets/fca-demo.mov
+++ b/public/assets/fca-demo.mov
--- a/public/assets/fca-parseLatl.mov
+++ b/public/assets/fca-parseLatl.mov
--- a/public/index.html
+++ b/public/index.html
@ -7,7 +7,7 @@
    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
    <link rel="stylesheet" href="%PUBLIC_URL%/stylesheets/reset.css">
    <link href="https://fonts.googleapis.com/css?family=Catamaran|Fira+Code&display=swap" rel="stylesheet">
-    <title>Phono Change Applier</title>
+    <title>Feature Change Applier</title>
  </head>
  <body>
    <noscript>You need to enable JavaScript to run this app.</noscript>
--- a/public/latl/ipa.latl
+++ b/public/latl/ipa.latl
@ -0,0 +1,88 @@
+set NASAL_PULMONIC_CONSONANTS               = [ m̥, m, ɱ, n̼, n̥, n, ɳ̊, ɳ, ɲ̊, ɲ, ŋ, ̊ŋ, ɴ ],
+    STOP_PULMONIC_CONSONANTS                = [ p, b, p̪, b̪, t̼, d̼, t, d, ʈ, ɖ, c, ɟ, k, ɡ, q, ɢ, ʡ, ʔ ],
+    S_FRICATIVE_PULMONIC_CONSONANTS         = [ s, z, ʃ, ʒ, ʂ, ʐ, ɕ, ʑ ],
+    FRICATIVE_PULMONIC_CONSONANTS           = [ ɸ, β, f, v, θ̼, ð̼, θ, ð, θ̠, ð̠, ɹ̠̊˔, ɹ̠˔, ɻ˔, ç, ʝ, x, ɣ, χ, ʁ, ħ, ʕ, h, ɦ ],
+    APPROXIMANT_PULMONIC_CONSONANTS         = [ ʋ̥, ʋ, ɹ̥, ɹ, ɻ̊, ɻ, j̊, j, ɰ̊, ɰ, ʔ̞ ],
+    TAP_PULMONIC_CONSONANTS                 = [ ⱱ̟, ⱱ, ɾ̼, ɾ̥, ɾ, ɽ̊, ɽ, ɢ̆, ʡ̆ ],
+    TRILL_PULMONIC_CONSONANTS               = [ ʙ̥, ʙ, r̥, r, ɽ̊r̥, ɽr, ʀ̥, ʀ, ʜ, ʢ ],
+    L_FRICATIVE_PULMONIC_CONSONANTS         = [ ɬ, ɮ, ɭ̊˔, ɭ˔, ʎ̝̊, ʎ̝, ʟ̝̊, ʟ̝ ],
+    L_APPROXIMANT_PULMONIC_CONSONANTS       = [ l̥, l, ɭ̊, ɭ, ʎ̥, ʎ, ʟ̥, ʟ, ʟ̠ ],
+    L_TAP_PULMONIC_CONSONANTS               = [ ɺ, ɭ̆, ʎ̆, ʟ̆ ],
+    AFFRICATE_PULMONIC_CONSONANTS           = [ pɸ, bβ, p̪f, b̪v, t̪θ, d̪ð, tɹ̝̊, dɹ̝, t̠ɹ̠̊˔, d̠ɹ̠˔, cç, ɟʝ, kx, ɡɣ, qχ, ʡʢ, ʔh ],
+    S_AFFRICATE_PULMONIC_CONSONANTS         = [ ts, dz, t̠ʃ, d̠ʒ, ʈʂ, ɖʐ, tɕ, dʑ ],
+    L_AFFRICATE_PULMONIC_CONSONANTS         = [ tɬ, dɮ, ʈɭ̊˔, cʎ̝̊, kʟ̝̊, ɡʟ̝ ],
+    DOUBLE_STOP_PULMONIC_CONSONANTS         = [ t͡p, d͡b, k͡p, ɡ͡b, q͡ʡ ],
+    DOUBLE_NASAL_PULMONIC_CONSONANTS        = [ n͡m, ŋ͡m ],
+    DOUBLE_FRICATIVE_PULMONIC_CONSONANTS    = [ ɧ ],
+    DOUBLE_APPROXIMANT_PULMONIC_CONSONANTS  = [ ʍ, w, ɥ̊, ɥ, ɫ ]
+
+set PULMONIC_CONSONANTS, C            = { NASAL_PULMONIC_CONSONANTS or STOP_PULMONIC_CONSONANTS 
+                                          or S_FRICATIVE_PULMONIC_CONSONANTS or FRICATIVE_PULMONIC_CONSONANTS 
+                                          or APPROXIMANT_PULMONIC_CONSONANTS or TAP_PULMONIC_CONSONANTS 
+                                          or TRILL_PULMONIC_CONSONANTS or L_FRICATIVE_PULMONIC_CONSONANTS 
+                                          or L_APPROXIMANT_PULMONIC_CONSONANTS or L_TAP_PULMONIC_CONSONANTS 
+                                          or AFFRICATE_PULMONIC_CONSONANTS or S_AFFRICATE_PULMONIC_CONSONANTS
+                                          or L_AFFRICATE_PULMONIC_CONSONANTS or DOUBLE_STOP_PULMONIC_CONSONANTS
+                                          or DOUBLE_NASAL_PULMONIC_CONSONANTS or DOUBLE_FRICATIVE_PULMONIC_CONSONANTS
+                                          or DOUBLE_APPROXIMANT_PULMONIC_CONSONANTS
+                                        }
+
+
+set STOP_EJECTIVE_CONSONANTS          = [ pʼ, tʼ, ʈʼ, cʼ, kʼ, qʼ, ʡʼ ],
+    FRICATIVE_EJECTIVE_CONSONANTS     = [ ɸʼ, fʼ, θʼ, sʼ, ʃʼ, ʂʼ, ɕʼ, xʼ, χʼ ],
+    L_FRICATIVE_EJECTIVE_CONSONANTS   = [ ɬʼ ],
+    AFFRICATE_EJECTIVE_CONSONANTS     = [ tsʼ, t̠ʃʼ, ʈʂʼ, kxʼ, qχʼ ],
+    L_AFFRICATE_EJECTIVE_CONSONANTS   = [ tɬʼ, cʎ̝̊ʼ, kʟ̝̊ʼ ]
+  
+set EJECTIVE_CONSONANTS               = { STOP_EJECTIVE_CONSONANTS or FRICATIVE_EJECTIVE_CONSONANTS 
+                                          or L_FRICATIVE_EJECTIVE_CONSONANTS or AFFRICATE_EJECTIVE_CONSONANTS
+                                          or L_AFFRICATE_EJECTIVE_CONSONANTS 
+                                        }
+
+set TENUIS_CLICK_CONSONANTS           = [ ʘ, ǀ, ǃ, ǂ ],
+    VOICED_CLICK_CONSONANTS           = [ ʘ̬, ǀ̬, ǃ̬, ǂ̬ ],
+    NASAL_CLICK_CONSONANTS            = [ ʘ̃, ǀ̃, ǃ̃, ǂ̃ ],
+    L_CLICK_CONSONANTS                = [ ǁ, ǁ̬ ]
+
+set CLICK_CONSONANTS                  = { TENUIS_CLICK_CONSONANTS or VOICED_CLICK_CONSONANTS
+                                          or NASAL_CLICK_CONSONANTS or L_CLICK_CONSONANTS 
+                                        }
+
+set IMPLOSIVE_CONSONANTS              = [ ɓ, ɗ, ᶑ, ʄ, ɠ, ʛ, ɓ̥, ɗ̥, ᶑ̊, ʄ̊, ɠ̊, ʛ̥ ]
+
+set NON_PULMONIC_CONSONANTS           = { EJECTIVE_CONSONANTS or CLICK_CONSONANTS or IMPLOSIVE_CONSONANTS }
+
+set CONSONANTS                        = { PULMONIC_CONSONANTS or NON_PULMONIC_CONSONANTS }
+
+set MODAL_VOWELS                      = [ i, y, ɨ, ʉ, ɯ, u, ɪ, ʏ, ʊ, e, ø ɘ, ɵ ɤ, o, ø̞ ə, o̞, ɛ, œ ɜ, ɞ ʌ, ɔ, æ, ɐ, a, ɶ, ä, ɑ, ɒ ],
+    BREATHY_VOWELS                    = { [ V ] in MODAL_VOWELS yield [ V̤ ] },
+    VOICELESS_VOWELS                  = { [ V ] in MODAL_VOWELS yield [ V̥ ] },
+    CREAKY_VOWELS                     = { [ V ] in MODAL_VOWELS yield [ V̰ ] }
+
+set SHORT_ORAL_VOWELS                 = { MODAL_VOWELS or BREATHY_VOWELS or CREAKY_VOWELS or VOICELESS_VOWELS },
+    LONG_ORAL_VOWELS                  = { [ V ] in SHORT_ORAL_VOWELS [ Vː ] },
+    ORAL_VOWELS                       = { SHORT_ORAL_VOWELS or LONG_ORAL_VOWELS }
+
+set NASAL_VOWELS                      = { [ V ] in ORAL_VOWELS yield [ Ṽ ] },
+    SHORT_NASAL_VOWELS                = { [ Vː ] in NASAL_VOWELS yield [ V ]ː },
+    LONG_NASAL_VOWELS                 = { [ Vː ] in NASAL_VOWELS }
+
+set VOWELS                            = { ORAL_VOWELS or NASAL_VOWELS }
+
+set PHONES                            = { VOWELS or CONSONANTS }
+
+; print [ GLOBAL ]
+
+[lateral
+  +=
+    L_AFFRICATE_EJECTIVE_CONSONANTS, L_AFFRICATE_PULMONIC_CONSONANTS, L_APPROXIMANT_PULMONIC_CONSONANTS,
+    L_CLICK_CONSONANTS, L_FRICATIVE_EJECTIVE_CONSONANTS, L_FRICATIVE_PULMONIC_CONSONANTS, L_TAP_PULMONIC_CONSONANTS
+  -=
+    { not { [+ lateral ] in CONSONANTS } }, VOWELS
+    ; alternative
+    ; { not { [+ lateral ] in PHONES } }
+]
+
+*proto-lang
+
+|child-lang
--- a/public/latl/waffle.latl
+++ b/public/latl/waffle.latl
@ -0,0 +1,644 @@
+; -------- GA ENGLISH PHONETIC INVENTORY
+
+; ---- VOWELS = æ / e / ə / ɑ / ɔ / ɪ̞ / ɛ / ʌ / ʊ̞ / i / u̟ 
+; -- NASAL = æ̃ / ẽ / ə̃ / ɑ̃ / ɔ̃ / ɪ̃ / ɛ̃ / ʌ̃ / ʊ̃ / ĩ / ũ 
+      ; ɪ̞ / ʊ̞ = lowered 
+      ; u̟     = advanced
+; -- LABIAL = u̟ / ʊ̞ / ɔ
+; -- +HIGH  = i / u̟ / ʊ̞ / ɪ̞ 
+; -- -HIGH  = ɑ / æ / e / ə / ɛ / ʌ
+; -- +LOW   = ɑ / æ / ɛ 
+; -- -LOW   = i / u̟ / ʊ̞ / ɪ̞ / e / ə / ʌ
+; -- +BACK  = ɑ / ɔ / ʌ / ʊ̞ / u̟ 
+; -- -BACK  = æ / e / ə / ɪ̞ / ɛ / i
+; -- +TENSE = e / i / u̟ / ɑ 
+; -- -TENSE = æ / ə / ɪ̞ / ɛ / ʌ / ʊ̞ / ɔ
+; ---- DIPHTHONGS = eə / eɪ̯ / ju̟ / äɪ̞ / ɔɪ̞ / oʊ̞ / aʊ̞ / ɑɹ / iɹ / ɛɹ / ɔɹ / ʊɹ 
+
+; ---- CONSONANTS = p (pʰ) / b (b̥) / t (tʰ)(ɾ)(ʔ) / d (d̥)(ɾ) / tʃ / dʒ (d̥ʒ̊) / k (kʰ) / g (g̊) / f / v (v̥) / θ / ð (ð̥) / 
+;                   s / z (z̥) / ʃ / ʒ (ʒ̊) / h (ɦ)(ç) / m (ɱ)(m̩) / n(n̩) / ŋ / l (l̩)/ ɹ (ɹʲ ~ ɹˤ)(ɹ̩) / w (w̥) / j / x / ʔ
+; -- PLOSIVES = p / p' / pʰ / t / t' / tʰ ɾ / k / k' / kʰ
+; -- AFFRICATES = tʃ / dʒ
+; -- FRICATIVES = f / v / θ / ð / s / z / ʃ / ʒ / ç / x
+; -- NASAL OBSTRUENTS =  m ɱ / n / ŋ
+; -- LIQUIDS = l
+; -- RHOTIC LIQUIDS = ɹ ɹʲ  ɹˤ
+; -- SYLLABIC CONSONANTS = m̩ / n̩ / l̩ / ɹ̩
+; -- GLIDES = j / w
+; -- LARYNGEALS = h ɦ / ʔ [- consonantal sonorant +/- LARYNGEAL FEATURES] only
+
+; -------- distinctive groups
+
+set PLOSIVES    = [ p, pʰ, t, tʼ, tʰ, ɾ, kʼ, k, kʰ ]
+    AFFRICATES  = [ tʃʰ, dʒ ]
+    FRICATIVES  = [ f, v, θ, ð, s, z, ʃ, ʒ, ç, x ]
+    NASALS      = [ m, ɱ, n, ŋ ]
+    LIQUIDS     = [ l, ɹ, ɹʲ, ɹˤ ]
+    SYLLABICS   = [ m̩, n̩, l̩, ɹ̩ ]
+    VOWELS      = [ æ, e, ə, ɑ, ɔ, ɪ̞, ɛ, ʌ, ʊ̞, i, u̟ ]
+    GLIDES      = [ j, w ]
+    LARYNGEALS  = [ h, ɦ, ʔ ]
+    VOWELS      = [ æ, e, ə, ɑ, ɔ, ɪ̞, ɛ, ʌ, ʊ̞, i, u̟ ]
+
+; ---- implicit
+; GLOBAL          { all sets }
+
+; ---- set join operations non-mutable! 
+; { SET_A not SET_B }   left anti join
+; { SET_A and SET_B }   inner join
+; { SET_A or SET_B }    full outer join
+; { not SET_A }             = { GLOBAL not SET_A }
+
+; ---- unnecessary sugar
+; { not SET_A nor SET_B }   = { GLOBAL not { SET_A or SET_B } }
+
+; ---- set character operations - non-mutable!
+; { [ Xy ] in SET_A }     FILTER:       where X is any character and y is a filtering character
+; { SET_A yield [ Xy ] }  CONCATENATE:  performs transformation with (prepended or) appended character
+; { SET_A yield [ X concat y ] }
+; { SET_A yield [ y concat X ] }
+; { SET_A yield y[ X ] }  DISSOCIATE:   performs transformation removing prepended (or appended) character
+; { SET_A yield y dissoc [ X ] }
+; { SET_A yield [ X ] dissoc y }
+; { [ Xy ] in SET_A yield [ X ]y }  combined FILTER and DISSOCIATE
+
+; ---- TENTATIVE!
+; ---- set feature operations - non-mutable!
+; { [ + feature1 - feature2 ] in SET_A }    FILTER:       where feature1 and feature2 are filtering features
+; { SET_A yield [ X + feature1 ] }            TRANSFORMATION:  performs transformation with (prepended or) appended character
+; { SET_A yield [ X - feature1 ] }
+; { SET_A yield [ X - feature1 + feature2 ] }
+; { [ X + feature1 - feature2 ] in SET_A yield [ - feature1 + feature2 ] }  combined FILTER and TRANSFORMATION
+
+; ---- MAPPING
+set PLOSIVES = [ p, t, k ],
+    FRICATIVES = [ f, s, x ],
+    ; pairs PLOSIVES with FRICATIVES that have matching features = [ pf, ts, kx ]
+    AFFRICATES = { PLOSIVES yield [ X concat { [ [ X ] - fricative  ] in FRICATIVES } ] }
+
+; ---- example with join, character, and feature operations
+; set SET_C = { [ PHONE +feature1 ] in { SET_A or SET_B } yield [ PHONE concat y ] }
+
+
+; -------- main class features
+
+[consonantal
+  += 
+    PLOSIVES, AFFRICATES, FRICATIVES, NASALS, LIQUIDS, SYLLABICS
+  -= 
+    VOWELS, GLIDES, LARYNGEALS
+]
+
+[sonorant
+  += 
+    VOWELS, GLIDES, LIQUIDS, NASALS, SYLLABICS
+  -= 
+    PLOSIVES, AFFRICATES, FRICATIVES, LARYNGEALS
+]
+
+[approximant
+  += 
+    VOWELS, LIQUIDS, GLIDES,
+    ; SYLLABIC LIQUIDS
+    l̩, ɹ̩
+  -=
+    PLOSIVES, AFFRICATES, FRICATIVES, NASALS,
+    ; SYLLABIC NASALS 
+    m̩, n̩
+]
+
+
+
+; -------- laryngeal features
+
+[voice
+  +=
+    VOWELS, GLIDES, LIQUIDS, NASALS, SYLLABICS,
+    ; VOICED FRICATIVES
+    v, ð, z, ʒ,
+    ; VOICED AFFRICATES
+    dʒ,
+    ; VOICED LARYNGEALS
+    ɦ
+  -= 
+    PLOSIVES,
+    ; VOICELESS AFFRICATES
+    tʃ,
+    ; VOICELESS FRICATIVES
+    f, θ, s, ʃ, ç, x,
+    ; VOICELESS LARYNGEALS
+    h, ʔ
+]
+
+[spreadGlottis
+  += 
+    ; ASPIRATED PLOSIVES
+    pʰ, tʰ, kʰ,
+    ; ASPIRATED AFFRICATES
+    
+    ; SPREAD LARYNGEALS
+    h ɦ  
+  -= 
+    VOWELS, FRICATIVES, NASALS, LIQUIDS, SYLLABICS, GLIDES,
+    ; UNASPIRATED PLOSIVES
+    p, pʼ, t, tʼ, ɾ, k, kʼ,
+    ; UNASPIRATED AFFRICATES 
+    tʃ, dʒ, 
+    ; CONSTRICTED LARYNGEALS
+    ʔ
+]
+
+[constrictedGlottis
+  += 
+    ; LARYNGEALIZED RHOTIC
+    ɹˤ,
+    ; CONSTRICTED LARYNGEAL
+    ʔ, 
+    ; EJECTIVE PLOSIVES
+    pʼ, tʼ, kʼ
+  -=
+    VOWELS, AFFRICATES, FRICATIVES, NASALS, SYLLABICS, GLIDES,
+    ; UNCONSTRICTED PLOSIVES 
+    { PLOSIVES not [ p', t', k' ] },
+    ; NON-CONSTRICTED LIQUIDS 
+    l, ɹ ɹʲ,
+    ; SPREAD LARYNGEALS 
+    h ɦ,
+]
+
+
+; -------- manner features
+
+[continuant
+  +=
+    ; FRICATIVES
+    f, v, θ, ð, s, z, ʃ, ʒ, ç, x,
+    ; VOWELS
+    æ, e, ə, ɑ, ɔ, ɪ̞, ɛ, ʌ, ʊ̞, i, u̟, æ̃, ẽ, ə̃, ɑ̃, ɔ̃, ɪ̃, ɛ̃, ʌ̃, ʊ̃, ĩ, ũ 
+    ; LIQUIDS + RHOTICS
+    l, ɹ ɹʲ ɹˤ,
+    ; GLIDES
+    j, w,
+    ; SYLLABIC LIQUIDS
+    l̩, ɹ̩,
+    ; TAPS
+    ɾ
+  -= 
+    ; NON-TAP PLOSIVES
+    p, pʼ, pʰ, t, tʼ, tʰ, k, kʼ, kʰ,
+    ; AFFRICATES
+    tʃ, dʒ,
+    ; NASALS
+    m ɱ, n, ŋ,
+    ; SYLLABIC NASALS
+    m̩, n̩ 
+]
+
+[nasal
+  +=
+    ; NASALS
+    m ɱ, n, ŋ,
+    ; SYLLABIC NASALS
+    m̩, n̩ 
+  -=
+    ; VOWELS
+    æ, e, ə, ɑ, ɔ, ɪ̞, ɛ, ʌ, ʊ̞, i, u̟, æ̃, ẽ, ə̃, ɑ̃, ɔ̃, ɪ̃, ɛ̃, ʌ̃, ʊ̃, ĩ, ũ 
+    ; FRICATIVES
+    f, v, θ, ð, s, z, ʃ, ʒ, ç, x,
+    ; LIQUIDS + RHOTICS
+    l, ɹ ɹʲ ɹˤ,
+    ; GLIDES
+    j, w,
+    ; SYLLABIC LIQUIDS
+    l̩, ɹ̩,
+    ; PLOSIVES
+    p, pʼ, pʰ, t, tʼ, tʰ ɾ, k, kʼ, kʰ,
+    ; AFFRICATES
+    tʃ, dʒ,
+]
+
+[strident
+  += 
+    ; STRIDENT FRICATIVES
+    f, v, s, z, ʃ, ʒ,
+    ; STRIDENT AFFRICATES
+    tʃ, dʒ
+  -=
+    ; VOWELS 
+    æ̃, ẽ, ə̃, ɑ̃, ɔ̃, ɪ̃, ɛ̃, ʌ̃, ʊ̃, ĩ, ũ 
+    ; PLOSIVES 
+    p, pʼ, pʰ, t, tʼ, tʰ ɾ, k, kʼ, kʰ,
+    ; NON-STRIDENT FRICATIVES
+    θ, ð, ç, x,
+    ; NASAL OBSTRUENTS
+    m ɱ, n, ŋ,
+    ; RHOTICS + LIQUIDS
+    l, ɹ ɹʲ ɹˤ,
+    ; SYLLABIC CONSONANTS 
+    m̩, n̩, l̩, ɹ̩,
+    ; GLIDES 
+    j, w
+]
+
+[lateral
+  += 
+    ; LATERAL LIQUIDS
+    l,
+    ; SYLLABIC LATERALS,
+    l̩
+  -=
+    ; VOWELS
+    æ, e, ə, ɑ, ɔ, ɪ̞, ɛ, ʌ, ʊ̞, i, u̟, æ̃, ẽ, ə̃, ɑ̃, ɔ̃, ɪ̃, ɛ̃, ʌ̃, ʊ̃, ĩ, ũ 
+    ; PLOSIVES 
+    p, pʼ, pʰ, t, tʼ, tʰ ɾ, k, kʼ, kʰ
+    ; AFFRICATES
+    tʃ, dʒ
+    ; FRICATIVES 
+    f, v, θ, ð, s, z, ʃ, ʒ, ç, x
+    ; NASAL OBSTRUENTS 
+    m ɱ, n, ŋ
+    ; RHOTIC LIQUIDS 
+    ɹ ɹʲ ɹˤ
+    ; NON-LIQUID SYLLABIC CONSONANTS 
+    m̩, n̩, ɹ̩
+    ; GLIDES 
+    j, w
+]
+
+
+
+; -------- ---- PLACE features
+; -------- labial features
+[labial
+  +=
+    ; ROUNDED VOWELS 
+    u̟, ʊ̞, ɔ, ʊ̃, ũ, ɔ̃
+    ; LABIAL PLOSIVES
+    p, pʼ, pʰ,
+    ; LABIAL FRICATIVES
+    f, v,
+    ; LABIAL NASALS
+    m ɱ,
+    ; LABIAL SYLLABIC CONSONANTS
+    m̩,
+    ; LABIAL GLIDES
+    w
+  -=
+    ; UNROUNDED VOWELS
+    æ, e, ə, ɑ, ɪ̞, ɛ, ʌ, i, æ̃, ẽ, ə̃, ɑ̃, ɪ̃, ɛ̃, ʌ̃, ĩ,
+    ; NON-LABIAL PLOSIVES 
+    t, tʼ, tʰ ɾ, k, kʼ, kʰ,
+    ; NON-LABIAL AFFRICATES 
+    tʃ, dʒ,
+    ; NON-LABIAL FRICATIVES 
+    θ, ð, s, z, ʃ, ʒ, ç, x,
+    ; NON-LABIAL NASAL OBSTRUENTS 
+    n, ŋ,
+    ; LIQUIDS 
+    l,
+    ; RHOTIC LIQUIDS 
+    ɹ ɹʲ ɹˤ,
+    ; NON-LABIAL SYLLABIC CONSONANTS 
+    n̩, l̩, ɹ̩,
+    ; NON-LABIAL GLIDES 
+    j 
+]
+
+; -------- coronal features
+
+[coronal
+  +=
+    ; CORONAL PLOSIVES
+    t, tʼ, tʰ ɾ,
+    ; CORONAL AFFRICATES
+    tʃ, dʒ,
+    ; CORONAL FRICATIVES
+    θ, ð, s, z, ʃ, ʒ,
+    ; CORONAL NASALS
+    n,
+    ; CORONAL LIQUIDS
+    l
+    ; CORONAL RHOTIC LIQUIDS
+    ɹ 
+    ; CORONAL SYLLABIC CONSONANTS
+    n̩, l̩, ɹ̩
+  -=
+    ; VOWELS
+    æ, e, ə, ɑ, ɔ, ɪ̞, ɛ, ʌ, ʊ̞, i, u̟, æ̃, ẽ, ə̃, ɑ̃, ɔ̃, ɪ̃, ɛ̃, ʌ̃, ʊ̃, ĩ, ũ 
+    ; NON-CORONAL PLOSIVES
+    p, pʼ, pʰ, k, kʼ, kʰ
+    ; NON-CORONAL FRICATIVES
+    f, v, ç, x
+    ; NON-CORONAL NASAL OBSTRUENTS
+    m ɱ, ŋ
+    ; NON-CORONAL RHOTIC LIQUIDS
+    ɹʲ ɹˤ
+    ; NON-CORONAL SYLLABIC CONSONANTS
+    m̩, 
+    ; NON-CORONAL GLIDES
+    j, w
+]
+
+[anterior
+  +=
+    ; ALVEOLAR PLOSIVES
+    t, tʼ, tʰ ɾ,
+    ; ALVEOLAR AFFRICATES
+    tʃ, dʒ,
+    ; DENTAL FRICATIVES
+    θ, ð,
+    ; ALVEOLAR FRICATIVES
+    s, z,
+    ; ALVEOLAR NASALS
+    n,
+    ; ALVEOLAR LIQUIDS
+    l
+    ; ALVEOLAR SYLLABIC CONSONANTS
+    n̩, l̩,
+  -=
+    ; POSTALVEOLAR FRICATIVES
+    ʃ, ʒ,
+    ; POSTALVEOLAR RHOTIC LIQUIDS
+    ɹ,
+    ; POSTALVEOLAR SYLLABIC CONSONANTS
+    ɹ̩,
+    ; -- NON-CORONALs
+    ; VOWELS
+    æ, e, ə, ɑ, ɔ, ɪ̞, ɛ, ʌ, ʊ̞, i, u̟, æ̃, ẽ, ə̃, ɑ̃, ɔ̃, ɪ̃, ɛ̃, ʌ̃, ʊ̃, ĩ, ũ 
+    ; NON-CORONAL PLOSIVES
+    p, pʼ, pʰ, k, kʼ, kʰ
+    ; NON-CORONAL FRICATIVES
+    f, v, ç, x
+    ; NON-CORONAL NASAL OBSTRUENTS
+    m ɱ, ŋ
+    ; NON-CORONAL RHOTIC LIQUIDS
+    ɹʲ ɹˤ
+    ; NON-CORONAL SYLLABIC CONSONANTS
+    m̩, 
+    ; NON-CORONAL GLIDES
+    j, w
+]
+
+[distributed
+  +=
+    ; DENTAL FRICATIVES
+    θ, ð,
+    ; POSTALVEOLAR FRICATIVES
+    ʃ, ʒ,
+    ; POSTALVEOLAR RHOTIC LIQUIDS
+    ɹ,
+    ; POSTALVEOLAR SYLLABIC CONSONANTS
+    ɹ̩,
+  -= 
+    ; apical, retroflex
+    ; ALVEOLAR PLOSIVES
+    t, tʼ, tʰ ɾ,
+    ; ALVEOLAR FRICATIVES
+    s, z,
+    ; ALVEOLAR NASALS
+    n,
+    ; ALVEOLAR LIQUIDS
+    l
+    ; ALVEOLAR SYLLABIC CONSONANTS
+    n̩, l̩,
+    ; -- NON-CORONALS
+    ; VOWELS
+    æ, e, ə, ɑ, ɔ, ɪ̞, ɛ, ʌ, ʊ̞, i, u̟, æ̃, ẽ, ə̃, ɑ̃, ɔ̃, ɪ̃, ɛ̃, ʌ̃, ʊ̃, ĩ, ũ 
+    ; NON-CORONAL PLOSIVES
+    p, pʼ, pʰ, k, kʼ, kʰ
+    ; NON-CORONAL FRICATIVES
+    f, v, ç, x
+    ; NON-CORONAL NASAL OBSTRUENTS
+    m ɱ, ŋ
+    ; NON-CORONAL RHOTIC LIQUIDS
+    ɹʲ ɹˤ
+    ; NON-CORONAL SYLLABIC CONSONANTS
+    m̩, 
+    ; NON-CORONAL GLIDES
+    j, w
+]
+
+; -------- dorsal features
+
+[dorsal
+  +=
+    ; VOWELS
+    æ, e, ə, ɑ, ɔ, ɪ̞, ɛ, ʌ, ʊ̞, i, u̟, æ̃, ẽ, ə̃, ɑ̃, ɔ̃, ɪ̃, ɛ̃, ʌ̃, ʊ̃, ĩ, ũ 
+    ; DORSAL PLOSIVES 
+    k, kʼ, kʰ,
+    ; DORSAL FRICATIVES 
+    ç, x,
+    ; DORSAL NASAL OBSTRUENTS
+    ŋ,
+    ; DORSAL RHOTIC LIQUIDS
+    ɹʲ  ɹˤ
+    ; DORSAL GLIDES
+    j
+  -=
+    ; NON-DORSAL PLOSIVES
+    p, pʼ, pʰ, t, tʼ, tʰ ɾ,
+    ; NON-DORSAL AFFRICATES
+    tʃ, dʒ,
+    ; NON-DORSAL FRICATIVES
+    f, v, θ, ð, s, z, ʃ, ʒ,
+    ; NON-DORSAL NASALS
+    m ɱ, n,
+    ; NON-DORSAL LIQUIDS
+    l
+    ; NON-DORSAL RHOTIC LIQUIDS
+    ɹ 
+    ; NON-DORSAL SYLLABIC CONSONANTS
+    m̩, n̩, l̩, ɹ̩
+    ; NON-DORSAL GLIDES
+    w
+]
+
+[high
+  += 
+    ; HIGH VOWELS
+    i, u̟, ʊ̞, ɪ̞, ĩ, ũ, ʊ̃, ɪ̃
+    ; HIGH DORSAL PLOSIVES 
+    k, kʼ, kʰ,
+    ; HIGH DORSAL FRICATIVES 
+    ç, x,
+    ; HIGH DORSAL NASAL OBSTRUENTS
+    ŋ,
+    ; HIGH RHOTIC LIQUIDS
+    ɹʲ  
+    ; HIGH DORSAL GLIDES
+    j, w
+  -= χ, e, o, a
+    ; NON-HIGH VOWELS 
+    ɑ, æ, e, ə, ɛ, ʌ, æ̃, ẽ, ə̃, ɑ̃, ɔ̃, ɛ̃, ʌ̃,
+    ; NON-HIGH RHOTIC LIQUIDS
+    ɹˤ
+    ; -- NON-DORSALS
+    ; NON-DORSAL PLOSIVES
+    p, pʼ, pʰ, t, tʼ, tʰ ɾ,
+    ; NON-DORSAL AFFRICATES
+    tʃ, dʒ,
+    ; NON-DORSAL FRICATIVES
+    f, v, θ, ð, s, z, ʃ, ʒ,
+    ; NON-DORSAL NASALS
+    m ɱ, n,
+    ; NON-DORSAL LIQUIDS
+    l
+    ; NON-DORSAL RHOTIC LIQUIDS
+    ɹ 
+    ; NON-DORSAL SYLLABIC CONSONANTS
+    m̩, n̩, l̩, ɹ̩
+    ; NON-DORSAL GLIDES
+    w
+]
+
+[low
+  +=
+    ; LOW VOWELS
+    ɑ, æ, ɛ, æ̃, ɑ̃, ɛ̃,
+    ; LOW DORSAL RHOTIC LIQUIDS
+    ɹˤ
+  -= a, ɛ, ɔ
+    ; NON-LOW VOWELS
+    i, u̟, ʊ̞, ɪ̞, e, ə, ʌ, ẽ, ə̃, ɔ̃, ɪ̃, ʌ̃, ʊ̃, ĩ, ũ 
+    ; NON-LOW DORSAL PLOSIVES 
+    k, kʼ, kʰ,
+    ; NON-LOW DORSAL FRICATIVES 
+    ç, x,
+    ; NON-LOW DORSAL NASAL OBSTRUENTS
+    ŋ,
+    ; NON-LOW DORSAL RHOTIC LIQUIDS
+    ɹʲ
+    ; DORSAL GLIDES
+    j
+    ; -- NON-DORSALS
+    ; NON-DORSAL PLOSIVES
+    p, pʼ, pʰ, t, tʼ, tʰ ɾ,
+    ; NON-DORSAL AFFRICATES
+    tʃ, dʒ,
+    ; NON-DORSAL FRICATIVES
+    f, v, θ, ð, s, z, ʃ, ʒ,
+    ; NON-DORSAL NASALS
+    m ɱ, n,
+    ; NON-DORSAL LIQUIDS
+    l
+    ; NON-DORSAL RHOTIC LIQUIDS
+    ɹ 
+    ; NON-DORSAL SYLLABIC CONSONANTS
+    m̩, n̩, l̩, ɹ̩
+    ; NON-DORSAL GLIDES
+    w
+]
+[back
+  += 
+; k, kʼ, ɣ, χ, u, ə, o, ʌ, ɑ
+    ; BACK VOWELS
+    ɑ, ɔ, ʌ, ʊ̞, u̟, ɑ̃, ɔ̃, ʌ̃, ʊ̃, ũ,
+    ; BACK DORSAL PLOSIVES 
+    k, kʼ, kʰ,
+    ; BACK DORSAL FRICATIVES
+    x,
+    ; BACK DORSAL NASAL OBSTRUENTS
+    ŋ,
+    ; BACK DORSAL RHOTIC LIQUIDS
+    ɹˤ
+  -= ç, k̟, i, y, ø, ɛ
+    ; NON-BACK DORSAL FRICATIVES 
+    ç,
+    ; NON-BACK DORSAL RHOTIC LIQUIDS
+    ɹʲ  
+    ; NON-BACK DORSAL GLIDES
+    j
+    ; NON-BACK VOWELS
+    æ, e, ə, ɪ̞, ɛ, i, æ̃, ẽ, ə̃, ɪ̃, ɛ̃, ĩ
+    ; -- NON-DORSALS
+    ; NON-DORSAL PLOSIVES
+    p, pʼ, pʰ, t, tʼ, tʰ ɾ,
+    ; NON-DORSAL AFFRICATES
+    tʃ, dʒ,
+    ; NON-DORSAL FRICATIVES
+    f, v, θ, ð, s, z, ʃ, ʒ,
+    ; NON-DORSAL NASALS
+    m ɱ, n,
+    ; NON-DORSAL LIQUIDS
+    l
+    ; NON-DORSAL RHOTIC LIQUIDS
+    ɹ 
+    ; NON-DORSAL SYLLABIC CONSONANTS
+    m̩, n̩, l̩, ɹ̩
+    ; NON-DORSAL GLIDES
+    w
+]
+[tense ; compare to ATR or RTR
+  += 
+    ; TENSE VOWELS 
+    e, i, u̟, ɑ, ĩ, ũ, ẽ, ɑ̃,
+  -=
+    ; NON-TENSE VOWELS 
+    æ, ə, ɪ̞, ɛ, ʌ, ʊ̞, ɔ, æ̃, ə̃, ɔ̃, ɪ̃, ɛ̃, ʌ̃, ʊ̃,
+    ; DORSAL PLOSIVES 
+    k, kʼ, kʰ,
+    ; DORSAL FRICATIVES 
+    ç, x,
+    ; DORSAL NASAL OBSTRUENTS
+    ŋ,
+    ; DORSAL RHOTIC LIQUIDS
+    ɹʲ  ɹˤ,
+    ; DORSAL GLIDES
+    j
+    ; -- NON-DORSALS
+    ; NON-DORSAL PLOSIVES
+    p, pʼ, pʰ, t, tʼ, tʰ ɾ,
+    ; NON-DORSAL AFFRICATES
+    tʃ, dʒ,
+    ; NON-DORSAL FRICATIVES
+    f, v, θ, ð, s, z, ʃ, ʒ,
+    ; NON-DORSAL NASALS
+    m ɱ, n,
+    ; NON-DORSAL LIQUIDS
+    l
+    ; NON-DORSAL RHOTIC LIQUIDS
+    ɹ 
+    ; NON-DORSAL SYLLABIC CONSONANTS
+    m̩, n̩, l̩, ɹ̩
+    ; NON-DORSAL GLIDES
+    w
+]
+
+*PROTO
+|Gif Lang
+
+*PROTO
+|Jif Lang
+
+; -- Devoicing, all our z's become s's
+  [ + voice consonantal - nasal]>[- voice]/._.
+
+; -- loss of schwa, the is th'
+  ə>0/._.
+
+; -- Ejectivization, all our pits become pit's
+  [+ spreadGlottis - continuant]>[+ constrictedGlottis - spreadGlottis]/._[+ constrictedGlottis]
+  [+ spreadGlottis - continuant]>[+ constrictedGlottis - spreadGlottis]/[+ constrictedGlottis]_.
+  [+ constrictedGlottis]>0/[+ constrictedGlottis - continuant]_.
+  [+ constrictedGlottis]>0/._[+ constrictedGlottis - continuant]
+
+; -- r color spreading, all our reports become rihpahts
+  [- consonantal tense]>[+ tense]/ɹ_.
+  [- consonantal tense]>[+ tense]/._ɹ
+  [- consonantal high]>[+ high]/ɹʲ_.
+  [- consonantal high]>[+ high]/._ɹʲ
+  [- consonantal back]>[+ back]/ɹˤ_.
+  [- consonantal back]>[+ back]/._ɹˤ
+  ɹ>0/._.
+  ɹʲ>0/._.
+  ɹˤ>0/._.
+
+; -- Deaspiration, tiff is diff and diff is tiff
+  [+ spreadGlottis - continuant]>[- spreadGlottis]/._.
+
+
+; "JavaScript"
+; "gif or jif? I say zhaif"
+; "This request returns an empty object"
+; "I love going to waffle js!"
+; "A donut a day makes living with the threat of pandemic easier"
--- a/src/App.js
+++ b/src/App.js
@ -5,7 +5,7 @@ import PhonoChangeApplier from './PhonoChangeApplier';
 function App() {
  return (
    <div className="App" data-testid="App">
-      <h1>Phono Change Applier</h1>
+      <h1 data-testid="App-name">Feature Change Applier</h1>
      <PhonoChangeApplier />
    </div>
  );
--- a/src/App.test.js
+++ b/src/App.test.js
@ -1,5 +1,6 @@
 import React from 'react';
 import ReactDOM from 'react-dom';
+import { HashRouter as Router } from 'react-router-dom';
 import App from './App';
 import renderer from 'react-test-renderer';
 import { exportAllDeclaration } from '@babel/types';
@ -8,13 +9,13 @@ import extendExpect from '@testing-library/jest-dom/extend-expect'

 it('renders App without crashing', () => {
  const div = document.createElement('div');
-  ReactDOM.render(<App />, div);
+  ReactDOM.render(<Router><App /></Router>, div);
  ReactDOM.unmountComponentAtNode(div);
 });

 describe('App', () => {
  it('renders the correct title', () => {
-    const { getByTestId } = render(<App />);
-    expect(getByTestId('App')).toHaveTextContent('Phono Change Applier');
+    const { getByTestId } = render(<Router><App /></Router>);
+    expect(getByTestId('App-name')).toHaveTextContent('Feature Change Applier');
  })
 })
--- a/src/PhonoChangeApplier.js
+++ b/src/PhonoChangeApplier.js
@ -1,4 +1,6 @@
 import React, { useState, useReducer } from 'react';
+import { Link, Route } from 'react-router-dom';
+
 import './PhonoChangeApplier.scss';

 import ProtoLang from './components/ProtoLang';
@ -7,25 +9,43 @@ import Epochs from './components/Epochs';
 import Options from './components/Options';
 import Output from './components/Output';

+import Latl from './components/Latl';
+import LatlOutput from './components/LatlOutput';
+
 import { stateReducer } from './reducers/reducer';
-import { initState } from './reducers/reducer.init';
+import { clearState, waffleState } from './reducers/reducer.init';

 const PhonoChangeApplier = () => {
  const [ state, dispatch ] = useReducer(
    stateReducer,
    {},
-    initState
+    waffleState
  )
-  const { lexicon, phones, phonemes, epochs, options, features, results, errors } = state;
+  const { lexicon, phones, phonemes, epochs, options, features, results, errors, latl, parseResults } = state;

  return (
-    <div className="PhonoChangeApplier" data-testid="PhonoChangeApplier">
-      <ProtoLang lexicon={lexicon} dispatch={dispatch}/>
-      <Features phones={phones} features={features} dispatch={dispatch}/>
-      <Epochs epochs={epochs} errors={errors} dispatch={dispatch} />
-      <Options options={options} dispatch={dispatch}/>
-      <Output results={results} options={options} dispatch={dispatch}/>
-    </div>
+    <>
+
+      <Route exact path="/latl">
+        <Link to="/">Back to GUI</Link>
+        <div className="PhonoChangeApplier PhonoChangeApplier--latl">
+          <Latl latl={latl} dispatch={dispatch}/>
+          <LatlOutput results={results} options={options} parseResults={parseResults} errors={errors} dispatch={dispatch}/>
+        </div>
+      </Route>
+
+      <Route exact path="/">
+        <Link to="/latl">LATL</Link>
+        <div className="PhonoChangeApplier PhonoChangeApplier--gui" data-testid="PhonoChangeApplier">
+          <ProtoLang lexicon={lexicon} dispatch={dispatch}/>
+          <Features phones={phones} features={features} dispatch={dispatch}/>
+          <Epochs epochs={epochs} errors={errors} dispatch={dispatch} />
+          <Options options={options} dispatch={dispatch}/>
+          <Output results={results} options={options} dispatch={dispatch}/>
+        </div>
+      </Route>
+
+    </>
  );
 }

--- a/src/PhonoChangeApplier.scss
+++ b/src/PhonoChangeApplier.scss
@ -1,9 +1,15 @@
+@import '../public/stylesheets/variables';
+
 div.App {
  max-height: 100vh;
  max-width: 100vw;
  line-height: 1.25em;
  padding: 1em;

+  a {
+    color: map-get($colors, 'text-input')
+  }
+
  h1 {
    font-size: 2em;
    padding: 1em 0;
@ -20,18 +26,42 @@ div.App {
    font-weight: 800;
  }

-  div.PhonoChangeApplier {
+  div.PhonoChangeApplier--gui {
    display: grid;
    width: 100%;
    place-items: center center;
-    grid-template-columns: repeat(auto-fit, minmax(20em, 1fr));
+    grid-template-columns: repeat(auto-fit, minmax(25em, 1fr));
    grid-template-rows: repeat(auto-fill, minmax(300px, 1fr));
    
    div {
      max-width: 100%;
-      max-height: 85vh;
+      max-height: 50vh;
      margin: 1em;
      overflow-y: scroll;
    }
  }
+
+  div.PhonoChangeApplier--latl {
+    display: flex;
+    flex-flow: row wrap;
+    
+  }
+
+  button.form, input[type="submit"].form, input[type="button"].form {
+    height: 2em;
+    border-radius: 0.25em;
+    border-color: transparent;
+    margin: 0.2em auto;
+    width: 10em;
+  }
+
+  button.form--add, input[type="submit"].form--add, input[type="button"].form--add{
+    background-color: greenyellow;
+    color: black;
+  }
+  
+  button.form--remove, input[type="submit"].form--remove, input[type="button"].form--remove {
+    background-color: red;
+    color: white;
+  }
 }
--- a/src/PhonoChangeApplier.test.js
+++ b/src/PhonoChangeApplier.test.js
@ -1,5 +1,6 @@
 import React from 'react';
 import ReactDOM from 'react-dom';
+import { HashRouter as Router } from 'react-router-dom';
 import App from './App';
 import PhonoChangeApplier from './PhonoChangeApplier';
 import renderer from 'react-test-renderer';
@ -9,13 +10,13 @@ import extendExpect from '@testing-library/jest-dom/extend-expect'

 it('renders PhonoChangeApplier without crashing', () => {
  const div = document.createElement('div');
-  ReactDOM.render(<PhonoChangeApplier />, div);
+  ReactDOM.render(<Router><PhonoChangeApplier /></Router>, div);
  ReactDOM.unmountComponentAtNode(div);
 });

 describe('App', () => {
  it('renders Proto Language Lexicon', () => {
-    const { getByTestId } = render(<PhonoChangeApplier />);
+    const { getByTestId } = render(<Router><PhonoChangeApplier /></Router>);
    expect(getByTestId('PhonoChangeApplier')).toHaveTextContent('Proto Language Lexicon');
  })
 })
--- a/src/components/Epochs.js
+++ b/src/components/Epochs.js
@ -7,13 +7,12 @@ import { render } from 'react-dom';


 const Epochs = ({epochs, errors, dispatch}) => {
-  
  const addEpoch = e => {
    e.preventDefault()
    let index = epochs.length + 1;
    dispatch({
      type: 'ADD_EPOCH',
-      value: {name: `Epoch ${index}`}
+      value: {name: `epoch ${index}`}
    })
  }

@ -39,32 +38,34 @@ const Epochs = ({epochs, errors, dispatch}) => {
  }
  
  const renderAddEpochButton = index => {
-    if (index === epochs.length - 1 ) return (
+    if (epochs && index === epochs.length - 1 ) return (
      <form onSubmit={e=>addEpoch(e)}>
-        <input type="submit" name="add-epoch" value="Add Epoch" ></input>
+        <input className="form form--add" type="submit" name="add-epoch" value="Add Epoch" ></input>
      </form>
    )
    return <></>
  }

  const renderEpochs = () => {
-    if (epochs.length) return epochs.map((epoch, index) => {
+    if (epochs && epochs.length) {
+      return epochs.map((epoch, index) => {
      const epochError = errors.epoch ? errors.error : null
      return (
-      <div 
-        className="SoundChangeSuite" 
-        data-testid={`${epoch.name}_SoundChangeSuite`}
-        key={`epoch-${index}`}
-      >
-        <SoundChangeSuite 
-          epochIndex={index} epoch={epoch} 
-          updateEpoch={updateEpoch} removeEpoch={removeEpoch}
-          epochs={epochs}
-          error={epochError}
-        />
-        {renderAddEpochButton(index)}
-      </div>
-    )});
+        <div 
+          className="SoundChangeSuite" 
+          data-testid={`${epoch.name}_SoundChangeSuite`}
+          key={`epoch-${index}`}
+        >
+          <SoundChangeSuite 
+            epochIndex={index} epoch={epoch} 
+            updateEpoch={updateEpoch} removeEpoch={removeEpoch}
+            epochs={epochs}
+            error={epochError}
+          />
+          {renderAddEpochButton(index)}
+        </div>
+      )});
+    }
    return renderAddEpochButton(-1)
  }

--- a/src/components/Features.js
+++ b/src/components/Features.js
@ -4,69 +4,6 @@ import './Features.scss';

 import type { featureAction } from '../reducers/reducer.features';

-const parsePhonesFromFeatureObject = featureObject => {
-  const getProperty = property => object => object[property]
-  
-  const getFeatureMap = (featureObject) => {
-    return Object.keys(featureObject).map(feature => {
-      const plusPhones = featureObject[feature].positive.map(getProperty('grapheme')).join(' / ');
-      const minusPhones = featureObject[feature].negative.map(getProperty('grapheme')).join(' / ');
-      return {[feature]: {plus: plusPhones, minus: minusPhones}}
-    })
-  }
-
-  const getFeatureMapJSX = (featureMap) => {
-    return featureMap.map((feature, index) => {
-      const featureName = Object.keys(feature);
-      const { plus, minus } = feature[featureName];
-      return (
-        <li key={`feature__${featureName}`}>
-          <span className="feature--names-and-phones">
-            <span className="feature--feature-name"> 
-              {`[+ ${featureName}]`}
-            </span>
-            <span className="feature--feature-phones">
-              {plus}
-            </span>
-          </span>
-          <span className="feature--names-and-phones">
-            <span className="feature--feature-name"> 
-              {`[- ${featureName}]`}
-            </span>
-            <span className="feature--feature-phones">
-              {minus}
-            </span>
-          </span>
-        </li>
-      )
-    })
-  }
-
-  const featureMap = getFeatureMap(featureObject);
-  const featureMapJSX = getFeatureMapJSX(featureMap);
-  return featureMapJSX;
-}
-
-const parseNewPhones = somePhones => {
-  if (somePhones === '') return [''];
-  return somePhones.split('/').map(phone => phone.trim());
-}
-
-const handleClickDispatch = e => dispatchFunction => actionBuilder => actionParameters => {
-  e.preventDefault();
-  return dispatchFunction(actionBuilder(actionParameters));
-}
-
-const buildAddFeatureAction = ([newPositivePhones, newNegativePhones, feature]): featureAction => (
-  {
-    type: "ADD_FEATURE",
-    value: {
-      positivePhones: parseNewPhones(newPositivePhones),
-      negativePhones: parseNewPhones(newNegativePhones),
-      feature
-    }
-  }
-)

 const Features = ({ phones, features, dispatch }) => {
  const [feature, setFeature] = useState('aspirated')
@ -79,6 +16,80 @@ const Features = ({ phones, features, dispatch }) => {
    setNewPositivePhones('');
    setNewNegativePhones('');
  }
+  
+  const handleDeleteClick = (e, feature) => {
+    e.preventDefault();
+    const deleteFeatureAction = {
+      type: "DELETE_FEATURE",
+      value: feature
+    }
+    return dispatch(deleteFeatureAction);
+  }
+  
+  const parsePhonesFromFeatureObject = featureObject => {
+    const getProperty = property => object => object[property]
+    
+    const getFeatureMap = (featureObject) => {
+      return Object.keys(featureObject).map(feature => {
+        const plusPhones = featureObject[feature].positive.map(getProperty('grapheme')).join(' / ');
+        const minusPhones = featureObject[feature].negative.map(getProperty('grapheme')).join(' / ');
+        return {[feature]: {plus: plusPhones, minus: minusPhones}}
+      })
+    }
+  
+    const getFeatureMapJSX = (featureMap) => {
+      return featureMap.map((feature, index) => {
+        const [featureName] = Object.keys(feature);
+        const { plus, minus } = feature[featureName];
+        return (
+          <li key={`feature__${featureName}`}>
+            <span className="feature--names-and-phones">
+              <span className="feature--feature-name"> 
+                {`[+ ${featureName} ]`}
+              </span>
+              <span className="feature--feature-phones">
+                {plus}
+              </span>
+            </span>
+            <span className="feature--names-and-phones">
+              <span className="feature--feature-name"> 
+                {`[- ${featureName} ]`}
+              </span>
+              <span className="feature--feature-phones">
+                {minus}
+              </span>
+            </span>
+            <button className="delete-feature" onClick={e => handleDeleteClick(e, featureName)}>X</button>
+          </li>
+        )
+      })
+    }
+  
+    const featureMap = getFeatureMap(featureObject);
+    const featureMapJSX = getFeatureMapJSX(featureMap);
+    return featureMapJSX;
+  }
+  
+  const parseNewPhones = somePhones => {
+    if (somePhones === '') return [''];
+    return somePhones.split('/').map(phone => phone.trim());
+  }
+  
+  const handleClickDispatch = e => dispatchFunction => actionBuilder => actionParameters => {
+    e.preventDefault();
+    return dispatchFunction(actionBuilder(actionParameters));
+  }
+  
+  const buildAddFeatureAction = ([newPositivePhones, newNegativePhones, feature]): featureAction => (
+    {
+      type: "ADD_FEATURE",
+      value: {
+        positivePhones: parseNewPhones(newPositivePhones),
+        negativePhones: parseNewPhones(newNegativePhones),
+        feature
+      }
+    }
+  )

  return (
    <div className="Features" data-testid="Features">
@ -114,6 +125,7 @@ const Features = ({ phones, features, dispatch }) => {
        </label>

        <input 
+          className="form form--add"
          type="submit" 
          onClick={e => handleClickDispatch(e)(dispatch)(buildAddFeatureAction)([newPositivePhones, newNegativePhones, feature])} 
          value="Add feature"
--- a/src/components/Features.scss
+++ b/src/components/Features.scss
@ -1,16 +1,24 @@
 div.Features {

-  ul.Features__list li {
-    display: grid;
-    grid-template-columns: 1fr 1fr;
-
-    span.feature--names-and-phones {
+  ul.Features__list {
+    width: 100%;
+    
+    li {
      display: grid;
-      grid-template-columns: repeat(auto-fit, minmax(60px, 1fr));
-    }
-
-    span.feature-name {
-      font-weight: 600;
+      gap: 0.5em;
+      grid-template-columns: 10fr 10fr 1fr;
+      margin: 0.5em 0;
+      place-items: center center;
+      
+      span.feature--names-and-phones {
+        display: grid;
+        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
+        place-items: center center;
+      }
+      
+      span.feature-name {
+        font-weight: 600;
+      }
    }
  }

@ -23,4 +31,12 @@ div.Features {
      font-size: 1em;
    }
  }
+
+  button.delete-feature {
+    background-color: red;
+    border-color: transparent;
+    border-radius: 0.5em;
+    color: white;
+    max-height: 1.5em;
+  }
 }
--- a/src/components/Latl.js
+++ b/src/components/Latl.js
@ -0,0 +1,28 @@
+import React from 'react';
+import './Latl.scss';
+
+const Latl = ({latl, dispatch}) => {
+  const { innerWidth, innerHeight } = window;
+  
+  const handleChange = e => {
+    const setLatlAction = {
+      type: 'SET_LATL',
+      value: e.target.value
+    }
+    dispatch(setLatlAction);
+  }
+
+  return (  
+    <div className="Latl">
+      <h3>.LATL</h3>
+      <textarea name="latl" id="latl" 
+        value={latl}
+        cols={'' + Math.floor(innerWidth / 15)} 
+        rows={'' + Math.floor(innerHeight / 30)}
+        onChange={handleChange}
+      />
+    </div>
+  );
+}
+
+export default Latl;
--- a/src/components/Latl.scss
+++ b/src/components/Latl.scss
@ -0,0 +1,3 @@
+div.Latl {
+  min-width: 80vw;
+}
--- a/src/components/LatlOutput.js
+++ b/src/components/LatlOutput.js
@ -0,0 +1,69 @@
+import React from 'react';
+import './LatlOutput.scss';
+import Output from './Output';
+
+const LatlOutput = ({results, options, dispatch, errors, parseResults}) => {
+  const handleClick = e => dispatchFunc => {
+    e.preventDefault()
+    return dispatchFunc();
+  }
+
+  const dispatchClear = () => {
+    const clearAction = {
+      type: 'CLEAR',
+      value: {}
+    }
+    dispatch(clearAction)
+  }
+
+  const dispatchParse = () => {
+    const parseAction = {
+      type: 'PARSE_LATL',
+      value: {}
+    }
+    dispatch(parseAction)
+  }
+
+  const dispatchRun = () => {
+    const runAction = {
+      type: 'RUN',
+      value: {}
+    }
+    dispatch(runAction)
+  }
+
+  return (
+    <div className="LatlOutput">
+      <h3>Output</h3>
+      <form>
+        <input 
+          className="form form--remove"
+          type="submit"
+          onClick={e=>handleClick(e)(dispatchClear)}
+          value="Clear"
+          />
+
+        <input 
+          id="Parse"
+          name="Parse"
+          className="form form--add"
+          type="submit"
+          onClick={e=>handleClick(e)(dispatchParse)}
+          value="Parse"
+          />
+        
+        <input 
+          id="Run"
+          name="Run"
+          className="form form--add"
+          type="submit"
+          onClick={e=>handleClick(e)(dispatchRun)}
+          value="Run"
+        />
+      </form>
+      <Output results={results} errors={errors} options={options} parseResults={parseResults}/>
+    </div>
+  );
+}
+
+export default LatlOutput;
--- a/src/components/LatlOutput.scss
+++ b/src/components/LatlOutput.scss
@ -0,0 +1,9 @@
+div.LatlOutput {
+  display: flex;
+  flex-flow: column nowrap;
+
+  form {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, min-max(10em, 1fr));
+  }
+}
--- a/src/components/Options.js
+++ b/src/components/Options.js
@ -65,8 +65,8 @@ const Options = ({ options, dispatch }) => {
          <span className="Options__output-example"> *proto > *epoch > output</span>
        </label> */}
        
-        <input type="submit" value="Run Changes"></input>
-        <input type="button" value="Clear Output" onClick={e=>handleOutputClearSubmit(e)}/>
+        <input className="form form--add" type="submit" value="Run Changes"></input>
+        <input className="form form--remove" type="button" value="Clear Output" onClick={e=>handleOutputClearSubmit(e)}/>
      </form>


--- a/src/components/Options.scss
+++ b/src/components/Options.scss
@ -3,6 +3,7 @@ div.Options {
  form {
    display: grid;
    grid-template-columns: 1fr 1fr;
+    gap: 0.5em;
  }

 }
--- a/src/components/Output.js
+++ b/src/components/Output.js
@ -2,7 +2,7 @@ import React from 'react';
 import './Output.scss';

 const Output = props => {
-  const { results, options, errors } = props;
+  const { results, options, errors, parseResults } = props;
  const renderResults = () => {
    switch(options.output) {
      case 'default':
@ -28,6 +28,7 @@ const Output = props => {
    <div className="Output" data-testid="Output">
      <h3>Results of Run</h3>
      <div data-testid="Output-lexicon" className="Output__container">
+        {parseResults ? parseResults : <></>}
        {results && results.length ? renderResults() : <></>}
      </div>
    </div>
--- a/src/components/ProtoLang.js
+++ b/src/components/ProtoLang.js
@ -10,6 +10,17 @@ const ProtoLang = ({ lexicon, dispatch }) => {
    return lexicon.map(getProperty('lexeme')).join('\n');
  }

+  const handleChange = e => {
+    const value = e.target.value.split(/\n/).map(line => {
+      const lexeme = line.split('#')[0].trim();
+      const epoch = line.split('#')[1] || '';
+      return { lexeme, epoch }
+    })
+    dispatch({
+      type: 'SET_LEXICON', 
+      value
+    })
+  }
  return (
    <div className="ProtoLang" data-testid="ProtoLang">
      <h3>Proto Language Lexicon</h3>
@ -21,22 +32,8 @@ const ProtoLang = ({ lexicon, dispatch }) => {
          rows="10"
          data-testid="ProtoLang-Lexicon__textarea"
          value={renderLexicon()}
-          onChange={e=> {
-            console.log(e.target.value.split(/\n/).map(line => {
-              const lexeme = line.split('#')[0].trim();
-              const epoch = line.split('#')[1] || '';
-              return { lexeme, epoch }
-              }))
-            dispatch({
-              type: 'SET_LEXICON', 
-              value: e.target.value.split(/\n/).map(line => {
-                const lexeme = line.split('#')[0].trim();
-                const epoch = line.split('#')[1] || '';
-                return { lexeme, epoch }
-              })
-            })
-          }
-          }>
+          onChange={e => handleChange(e)}
+          >
        </textarea>
      </form>
    </div>
--- a/src/components/SoundChangeSuite.js
+++ b/src/components/SoundChangeSuite.js
@ -48,10 +48,8 @@ const SoundChangeSuite = props => {
          list={`${epoch.name}-parents-list`}
          value={epoch.parent || 'none'}
          onChange={e=>changeHandler(
-            e, ()=>{
-              console.log(e.target.value)
-              setEpoch({...epoch, parent:e.target.value})
-            })
+            e, ()=>setEpoch({...epoch, parent:e.target.value})
+          )
          }
          >
          {parentsOptions()}
@ -103,7 +101,7 @@ const SoundChangeSuite = props => {
        ></textarea>
      </form>
      <form onSubmit={e=>removeEpoch(e, epoch.name)}>
-        <input type="submit" name="remove-epoch" value={`remove ${epoch.name}`}></input>
+        <input className="form form--remove" type="submit" name="remove-epoch" value={`remove ${epoch.name}`}></input>
      </form>
    </>
  );
--- a/src/index.js
+++ b/src/index.js
@ -1,10 +1,12 @@
 import React from 'react';
 import ReactDOM from 'react-dom';
+import { HashRouter as Router } from 'react-router-dom';
 import './index.scss';
 import App from './App';
 import * as serviceWorker from './serviceWorker';

-ReactDOM.render(<App />, document.getElementById('root'));
+ReactDOM.render(<Router><App /></Router>
+  , document.getElementById('root'));

 // If you want your app to work offline and load faster, you can change
 // unregister() to register() below. Note this comes with some pitfalls.
--- a/src/reducers/reducer.clear.js
+++ b/src/reducers/reducer.clear.js
@ -1,3 +1,3 @@
 export const clearOutput = (state, action) => {
-  return { ...state, results: [], errors: {} };
+  return { ...state, results: [], errors: {}, parseResults: '' };
 }
--- a/src/reducers/reducer.epochs.test.js
+++ b/src/reducers/reducer.epochs.test.js
@ -5,8 +5,9 @@ describe('Epochs', () => {
  beforeEach(()=> {
    state.epochs = [
      {
-        name: 'epoch 1',
-        changes: ['']
+        name: 'epoch-1',
+        changes: [''],
+        parent: null
      }
    ]
  })
@ -17,45 +18,45 @@ describe('Epochs', () => {
  });

  it('epochs addition returns new epochs list', () => {
-    const action = {type: 'ADD_EPOCH', value: { name: 'epoch 2', changes: ['']}};
+    const action = {type: 'ADD_EPOCH', value: { name: 'epoch-2', changes: [''], parent: null}};
    expect(stateReducer(state, action)).toEqual({...state, epochs: [...state.epochs, action.value]})
  })
  
-  it('epoch name mutation returns new epochs list with mutation', () => {
-    const firstAction = {type: 'ADD_EPOCH', value: { name: 'epoch 2', changes: ['']}};
+  it('epoch-name mutation returns new epochs list with mutation', () => {
+    const firstAction = {type: 'ADD_EPOCH', value: { name: 'epoch-2', changes: ['']}};
    const secondAction = {type: 'SET_EPOCH', value: { index: 0, name: 'proto-lang'}};
    const secondState = stateReducer(state, firstAction);
    expect(stateReducer(secondState, secondAction)).toEqual(
      {...state, 
        epochs: [
-          {name: 'proto-lang', changes: ['']},
-          {name: 'epoch 2', changes: ['']}
+          {name: 'proto-lang', changes: [''], parent: null},
+          {name: 'epoch-2', changes: [''], parent: null}
        ]
      }
    );
  });
  
  it('epoch changes mutation returns new epochs list with mutation', () => {
-    const firstAction = {type: 'ADD_EPOCH', value: { name: 'epoch 2', changes: ['']}};
+    const firstAction = {type: 'ADD_EPOCH', value: { name: 'epoch-2', changes: ['']}};
    const secondAction = {type: 'SET_EPOCH', value: { index: 0, changes: ['n>t/_#', '[+plosive]>[+nasal -plosive]/_n']}};
    const secondState = stateReducer(state, firstAction);
    expect(stateReducer(secondState, secondAction)).toEqual(
      {...state, 
        epochs: [
-          {name: 'epoch 1', changes: ['n>t/_#', '[+plosive]>[+nasal -plosive]/_n']},
-          {name: 'epoch 2', changes: ['']}
+          {name: 'epoch-1', changes: ['n>t/_#', '[+plosive]>[+nasal -plosive]/_n'], parent: null},
+          {name: 'epoch-2', changes: [''], parent: null}
        ]
      }
      );
    });
    
    it('epochs returned with deleted epoch removed', () => {
-      const firstAction = {type: 'ADD_EPOCH', value: { name: 'epoch 2', changes: ['']}};
+      const firstAction = {type: 'ADD_EPOCH', value: { name: 'epoch-2', changes: ['']}};
      const stateWithTwoEpochs = stateReducer(state, firstAction);
-      const secondAction = {type: 'REMOVE_EPOCH', value: {index: 0, name: 'epoch 1'}}
+      const secondAction = {type: 'REMOVE_EPOCH', value: {index: 0, name: 'epoch-1'}}
      expect(stateReducer(stateWithTwoEpochs, secondAction)).toEqual({
        ...state,
-        epochs: [{ name: 'epoch 2', changes: ['']}]
+        epochs: [{ name: 'epoch-2', changes: [''], parent: null}]
      });
  });

--- a/src/reducers/reducer.features.js
+++ b/src/reducers/reducer.features.js
@ -35,15 +35,22 @@ const findPhone = (phones: {}, phone: string): {} => {
 const addFeatureToPhone = (
  phones: {}, phone: string, featureKey: string, featureValue: boolean
 ): {} => {
-  let node = {}
-  phone.split('').forEach((graph, index) => {
-    node = index === 0 ? phones[graph] : node[graph];
-    
-    if (index === phone.split('').length - 1) {
-      node.features = {...node.features, [featureKey]: featureValue}
-    }
-  });
-  return phones;
+  try {
+    let node = {}
+    phone.split('').forEach((graph, index) => {
+      node = index === 0 ? phones[graph] : node[graph];
+      
+      if (index === phone.split('').length - 1) {
+        node.features = node && node.features 
+        ? {...node.features, [featureKey]: featureValue } 
+        : {[featureKey]: featureValue};
+      }
+    });
+    return phones;
+  }
+  catch (e) {
+    throw { phones, phone, featureKey, featureValue }
+  }
 }

 export const addFeature = (state: stateType, action: featureAction): stateType => {
@ -77,4 +84,12 @@ export const addFeature = (state: stateType, action: featureAction): stateType =
  
  let newFeature = {[action.value.feature]: {positive: positivePhones, negative: negativePhones}};
  return {...state, features:{...state.features, ...newFeature}, phones: newPhoneObject}
+}
+
+export const deleteFeature = (state, action) => {
+  const deletedFeature = state.features[action.value];
+  deletedFeature.positive.forEach(phone => delete phone.features[action.value])
+  deletedFeature.negative.forEach(phone => delete phone.features[action.value])
+  delete state.features[action.value];
+  return state
 }
--- a/src/reducers/reducer.features.test.js
+++ b/src/reducers/reducer.features.test.js
@ -31,4 +31,17 @@ describe('Features', () => {
    );
  });

+  it('feature deletion returns new feature list', () => {
+    const action = {type: 'DELETE_FEATURE', value: 'occlusive'}
+    expect(stateReducer(state, action)).toEqual(
+      {...state,
+        features: {},
+        phones: {
+          a: {features: {}, grapheme: 'a'},
+          n: {features: {}, grapheme: 'n'}
+        }
+      }
+    )
+  })
+
 });
--- a/src/reducers/reducer.init.js
+++ b/src/reducers/reducer.init.js
@ -5,11 +5,39 @@ export type initAction = {
  type: "INIT"
 }

+export const clearState = () => {
+  return {
+    epochs: [],
+    phones: {},
+    options: { output: 'default', save: false },
+    results: [],
+    errors: {},
+    features: {},
+    lexicon: [],
+    latl: '',
+    parseResults: ''
+  }
+}
+
+export const waffleState = () => {
+  return {
+    epochs: [],
+    phones: {},
+    options: { output: 'default', save: false },
+    results: [],
+    errors: {},
+    features: {},
+    lexicon: [],
+    latl: waffleLatl,
+    parseResults: ''
+  }
+}
+
 export const initState = (changesArgument: number): stateType => {
  const state = {
    epochs: [
      {
-        name: 'epoch 1',
+        name: 'epoch-1',
        changes: [
          '[+ occlusive - nasal]>[+ occlusive + nasal]/n_.',
          'a>ɯ/._#',
@ -63,7 +91,9 @@ export const initState = (changesArgument: number): stateType => {
    results: [],
    errors: {},
    features: {},
-    lexicon: []
+    lexicon: [],
+    latl: '',
+    parseResults: ''
  };
  state.features = {
    sonorant: { positive:[ state.phones.a, state.phones.u, state.phones.ɯ, state.phones.ə, state.phones.n], negative: [] },
@ -89,4 +119,621 @@ export const initState = (changesArgument: number): stateType => {
  if(changesArgument > -1) state.epochs[0].changes = state.epochs[0].changes.splice(0, changesArgument)

  return state;
-}
+}
+
+const waffleLatl = `
+; -------- main class features
+
+[consonantal
+  += 
+    ; PLOSIVES
+    p / pʼ / pʰ / t / tʼ / tʰ ɾ / k / kʼ / kʰ /
+    ; AFFRICATES
+    tʃ / dʒ /
+    ; FRICATIVES
+    f / v / θ / ð / s / z / ʃ / ʒ / ç / x /
+    ; NASALS
+    m ɱ / n / ŋ /
+    ; LIQUIDS + RHOTICS
+    l / ɹ ɹʲ ɹˤ /
+    ; SYLLABIC CONSONANTS 
+    m̩ / n̩ / l̩ / ɹ̩
+  -= 
+    ; VOWELS
+    æ / e / ə / ɑ / ɔ / ɪ̞ / ɛ / ʌ / ʊ̞ / i / u̟ /
+    ; GLIDES
+    j / w / 
+    ; LARYNGEALS
+    h ɦ / ʔ
+]
+
+[sonorant
+  += 
+    ; VOWELS
+    æ / e / ə / ɑ / ɔ / ɪ̞ / ɛ / ʌ / ʊ̞ / i / u̟ /
+    ; GLIDES
+    j / w w̥ /
+    ; LIQUIDS + RHOTICS
+    l / ɹ ɹʲ ɹˤ /
+    ; NASALS
+    m ɱ / n / ŋ /
+    ; SYLLABIC CONSONANTS  
+    m̩ / n̩ / l̩ / ɹ̩
+  -= 
+    ; PLOSIVES
+    p / pʼ / pʰ / t / tʼ / tʰ ɾ / k / kʼ / kʰ /
+    ; AFFRICATES
+    tʃ / dʒ /
+    ; FRICATIVES
+    f / v / θ / ð / s / z / ʃ / ʒ / ç / x /
+    ; LARYNGEALS
+    h ɦ / ʔ
+]
+[approximant
+  += 
+    ; VOWELS
+    æ / e / ə / ɑ / ɔ / ɪ̞ / ɛ / ʌ / ʊ̞ / i / u̟ /
+    ; LIQUIDS + RHOTICS
+    l / ɹ ɹʲ ɹˤ /
+    ; GLIDES
+    j / w /
+    ; SYLLABIC LIQUIDS
+    l̩ / ɹ̩
+  -=
+    ; PLOSIVES
+    p / pʼ / pʰ / t / tʼ / tʰ ɾ / k / kʼ / kʰ /
+    ; AFFRICATES
+    tʃ / dʒ /
+    ; FRICATIVES
+    f / v / θ / ð / s / z / ʃ / ʒ / ç / x /
+    ; NASALS
+    m ɱ / n / ŋ /
+    ; SYLLABIC NASALS 
+    m̩ / n̩
+]
+
+
+
+; -------- laryngeal features
+
+[voice
+  +=
+    ; VOWELS
+    æ / e / ə / ɑ / ɔ / ɪ̞ / ɛ / ʌ / ʊ̞ / i / u̟ /
+    ; GLIDES
+    j / w /
+    ; LIQUIDS + RHOTICS
+    l / ɹ ɹʲ ɹˤ /
+    ; NASALS
+    m ɱ / n / ŋ /
+    ; SYLLABIC CONSONANTS  
+    m̩ / n̩ / l̩ / ɹ̩ /
+    ; VOICED FRICATIVES
+    v / ð / z / ʒ /
+    ; VOICED AFFRICATES
+    dʒ /
+    ; VOICED LARYNGEALS
+    ; LARYNGEALS
+    ɦ
+  -= voiceless obstruents
+    ; PLOSIVES
+    p / pʼ / pʰ / t / tʼ / tʰ ɾ / k / kʼ / kʰ /
+    ; VOICELESS AFFRICATES
+    tʃ / /
+    ; VOICELESS FRICATIVES
+    f / θ / s / ʃ / ç / x /
+    ; VOICELESS LARYNGEALS
+    h / ʔ
+]
+
+[spreadGlottis
+  += 
+    ; ASPIRATED PLOSIVES
+    pʰ / tʰ / kʰ /
+    ; ASPIRATED AFFRICATES
+   /
+    ; SPREAD LARYNGEALS
+    h ɦ  
+  -= 
+    ; VOWELS
+    æ / e / ə / ɑ / ɔ / ɪ̞ / ɛ / ʌ / ʊ̞ / i / u̟ /
+    ; UNASPIRATED PLOSIVES
+    p / pʼ / t / tʼ / ɾ / k / kʼ /
+    ; UNASPIRATED AFFRICATES 
+    tʃ / dʒ /
+    ; FRICATIVES 
+    f / v / θ / ð / s / z / ʃ / ʒ / ç / x /
+    ; NASAL OBSTRUENTS 
+     m ɱ / n / ŋ /
+    ; LIQUIDS + RHOTICS
+    l / ɹ ɹʲ ɹˤ /
+    ; SYLLABIC CONSONANTS 
+    m̩ / n̩ / l̩ / ɹ̩ /
+    ; GLIDES 
+    j / w
+    ; CONSTRICTED LARYNGEALS
+    ʔ
+]
+[constrictedGlottis
+  += 
+    ; LARYNGEALIZED RHOTIC
+    ɹˤ /
+    ; CONSTRICTED LARYNGEAL
+    ʔ / 
+    ; EJECTIVE PLOSIVES
+    pʼ / tʼ / kʼ
+  -=
+    ; VOWELS 
+    æ / e / ə / ɑ / ɔ / ɪ̞ / ɛ / ʌ / ʊ̞ / i / u̟ /
+    ; PLOSIVES 
+    p / pʰ / t / tʰ ɾ / k / kʰ /
+    ; AFFRICATES 
+    tʃ / dʒ /
+    ; FRICATIVES 
+    f / v / θ / ð / s / z / ʃ / ʒ / ç / x /
+    ; NASAL OBSTRUENTS 
+    m ɱ / n / ŋ /
+    ; LIQUIDS 
+    l /
+    ; NON-PHARYNGEALIZED RHOTICS 
+    ɹ ɹʲ /
+    ; SYLLABIC CONSONANTS 
+    m̩ / n̩ / l̩ / ɹ̩
+    ; GLIDES
+    j / w
+    ; SPREAD LARYNGEALS 
+    h ɦ /
+]
+
+
+; -------- manner features
+
+[continuant
+  +=
+    ; FRICATIVES
+    f / v / θ / ð / s / z / ʃ / ʒ / ç / x /
+    ; VOWELS
+    æ / e / ə / ɑ / ɔ / ɪ̞ / ɛ / ʌ / ʊ̞ / i / u̟ /
+    ; LIQUIDS + RHOTICS
+    l / ɹ ɹʲ ɹˤ /
+    ; GLIDES
+    j / w /
+    ; SYLLABIC LIQUIDS
+    l̩ / ɹ̩ /
+    ; TAPS
+    ɾ
+  -= 
+    ; NON-TAP PLOSIVES
+    p / pʼ / pʰ / t / tʼ / tʰ / k / kʼ / kʰ /
+    ; AFFRICATES
+    tʃ / dʒ /
+    ; NASALS
+    m ɱ / n / ŋ /
+    ; SYLLABIC NASALS
+    m̩ / n̩ 
+]
+
+[nasal
+  +=
+    ; NASALS
+    m ɱ / n / ŋ /
+    ; SYLLABIC NASALS
+    m̩ / n̩ 
+  -=
+    ; VOWELS
+    æ / e / ə / ɑ / ɔ / ɪ̞ / ɛ / ʌ / ʊ̞ / i / u̟ /
+    ; FRICATIVES
+    f / v / θ / ð / s / z / ʃ / ʒ / ç / x /
+    ; LIQUIDS + RHOTICS
+    l / ɹ ɹʲ ɹˤ /
+    ; GLIDES
+    j / w /
+    ; SYLLABIC LIQUIDS
+    l̩ / ɹ̩ /
+    ; PLOSIVES
+    p / pʼ / pʰ / t / tʼ / tʰ ɾ / k / kʼ / kʰ /
+    ; AFFRICATES
+    tʃ / dʒ /
+]
+
+[strident
+  += 
+    ; STRIDENT FRICATIVES
+    f / v / s / z / ʃ / ʒ /
+    ; STRIDENT AFFRICATES
+    tʃ / dʒ
+  -=
+    ; VOWELS 
+    æ / e / ə / ɑ / ɔ / ɪ̞ / ɛ / ʌ / ʊ̞ / i / u̟ /
+    ; PLOSIVES 
+    p / pʼ / pʰ / t / tʼ / tʰ ɾ / k / kʼ / kʰ /
+    ; NON-STRIDENT FRICATIVES
+    θ / ð / ç / x /
+    ; NASAL OBSTRUENTS
+    m ɱ / n / ŋ /
+    ; RHOTICS + LIQUIDS
+    l / ɹ ɹʲ ɹˤ /
+    ; SYLLABIC CONSONANTS 
+    m̩ / n̩ / l̩ / ɹ̩ /
+    ; GLIDES 
+    j / w
+]
+
+[lateral
+  += 
+    ; LATERAL LIQUIDS
+    l /
+    ; SYLLABIC LATERALS /
+    l̩
+  -=
+    ; VOWELS
+    æ / e / ə / ɑ / ɔ / ɪ̞ / ɛ / ʌ / ʊ̞ / i / u̟ /
+    ; PLOSIVES 
+    p / pʼ / pʰ / t / tʼ / tʰ ɾ / k / kʼ / kʰ
+    ; AFFRICATES
+    tʃ / dʒ
+    ; FRICATIVES 
+    f / v / θ / ð / s / z / ʃ / ʒ / ç / x
+    ; NASAL OBSTRUENTS 
+    m ɱ / n / ŋ
+    ; RHOTIC LIQUIDS 
+    ɹ ɹʲ ɹˤ
+    ; NON-LIQUID SYLLABIC CONSONANTS 
+    m̩ / n̩ / ɹ̩
+    ; GLIDES 
+    j / w
+]
+
+
+
+; -------- ---- PLACE features
+; -------- labial features
+[labial
+  +=
+    ; ROUNDED VOWELS 
+    u̟ / ʊ̞ / ɔ /
+    ; LABIAL PLOSIVES
+    p / pʼ / pʰ /
+    ; LABIAL FRICATIVES
+    f / v /
+    ; LABIAL NASALS
+    m ɱ /
+    ; LABIAL SYLLABIC CONSONANTS
+    m̩ /
+    ; LABIAL GLIDES
+    w
+  -=
+    ; UNROUNDED VOWELS
+    æ / e / ə / ɑ / ɪ̞ / ɛ / ʌ / i /
+    ; NON-LABIAL PLOSIVES 
+    t / tʼ / tʰ ɾ / k / kʼ / kʰ /
+    ; NON-LABIAL AFFRICATES 
+    tʃ / dʒ /
+    ; NON-LABIAL FRICATIVES 
+    θ / ð / s / z / ʃ / ʒ / ç / x /
+    ; NON-LABIAL NASAL OBSTRUENTS 
+    n / ŋ /
+    ; LIQUIDS 
+    l /
+    ; RHOTIC LIQUIDS 
+    ɹ ɹʲ ɹˤ /
+    ; NON-LABIAL SYLLABIC CONSONANTS 
+    n̩ / l̩ / ɹ̩ /
+    ; NON-LABIAL GLIDES 
+    j 
+]
+
+; -------- coronal features
+
+[coronal
+  +=
+    ; CORONAL PLOSIVES
+    t / tʼ / tʰ ɾ /
+    ; CORONAL AFFRICATES
+    tʃ / dʒ /
+    ; CORONAL FRICATIVES
+    θ / ð / s / z / ʃ / ʒ /
+    ; CORONAL NASALS
+    n /
+    ; CORONAL LIQUIDS
+    l
+    ; CORONAL RHOTIC LIQUIDS
+    ɹ 
+    ; CORONAL SYLLABIC CONSONANTS
+    n̩ / l̩ / ɹ̩
+  -=
+    ; VOWELS
+    æ / e / ə / ɑ / ɔ / ɪ̞ / ɛ / ʌ / ʊ̞ / i / u̟ /
+    ; NON-CORONAL PLOSIVES
+    p / pʼ / pʰ / k / kʼ / kʰ
+    ; NON-CORONAL FRICATIVES
+    f / v / ç / x
+    ; NON-CORONAL NASAL OBSTRUENTS
+    m ɱ / ŋ
+    ; NON-CORONAL RHOTIC LIQUIDS
+    ɹʲ ɹˤ
+    ; NON-CORONAL SYLLABIC CONSONANTS
+    m̩ / 
+    ; NON-CORONAL GLIDES
+    j / w
+]
+
+[anterior
+  +=
+    ; ALVEOLAR PLOSIVES
+    t / tʼ / tʰ ɾ /
+    ; ALVEOLAR AFFRICATES
+    tʃ / dʒ /
+    ; DENTAL FRICATIVES
+    θ / ð /
+    ; ALVEOLAR FRICATIVES
+    s / z /
+    ; ALVEOLAR NASALS
+    n /
+    ; ALVEOLAR LIQUIDS
+    l
+    ; ALVEOLAR SYLLABIC CONSONANTS
+    n̩ / l̩ /
+  -=
+    ; POSTALVEOLAR FRICATIVES
+    ʃ / ʒ /
+    ; POSTALVEOLAR RHOTIC LIQUIDS
+    ɹ /
+    ; POSTALVEOLAR SYLLABIC CONSONANTS
+    ɹ̩ /
+    ; -- NON-CORONALs
+    ; VOWELS
+    æ / e / ə / ɑ / ɔ / ɪ̞ / ɛ / ʌ / ʊ̞ / i / u̟ /
+    ; NON-CORONAL PLOSIVES
+    p / pʼ / pʰ / k / kʼ / kʰ
+    ; NON-CORONAL FRICATIVES
+    f / v / ç / x
+    ; NON-CORONAL NASAL OBSTRUENTS
+    m ɱ / ŋ
+    ; NON-CORONAL RHOTIC LIQUIDS
+    ɹʲ ɹˤ
+    ; NON-CORONAL SYLLABIC CONSONANTS
+    m̩ / 
+    ; NON-CORONAL GLIDES
+    j / w
+]
+
+[distributed
+  +=
+    ; DENTAL FRICATIVES
+    θ / ð /
+    ; POSTALVEOLAR FRICATIVES
+    ʃ / ʒ /
+    ; POSTALVEOLAR RHOTIC LIQUIDS
+    ɹ /
+    ; POSTALVEOLAR SYLLABIC CONSONANTS
+    ɹ̩ /
+  -= 
+    ; apical / retroflex
+    ; ALVEOLAR PLOSIVES
+    t / tʼ / tʰ ɾ /
+    ; ALVEOLAR FRICATIVES
+    s / z /
+    ; ALVEOLAR NASALS
+    n /
+    ; ALVEOLAR LIQUIDS
+    l
+    ; ALVEOLAR SYLLABIC CONSONANTS
+    n̩ / l̩ /
+    ; -- NON-CORONALS
+    ; VOWELS
+    æ / e / ə / ɑ / ɔ / ɪ̞ / ɛ / ʌ / ʊ̞ / i / u̟ /
+    ; NON-CORONAL PLOSIVES
+    p / pʼ / pʰ / k / kʼ / kʰ
+    ; NON-CORONAL FRICATIVES
+    f / v / ç / x
+    ; NON-CORONAL NASAL OBSTRUENTS
+    m ɱ / ŋ
+    ; NON-CORONAL RHOTIC LIQUIDS
+    ɹʲ ɹˤ
+    ; NON-CORONAL SYLLABIC CONSONANTS
+    m̩ / 
+    ; NON-CORONAL GLIDES
+    j / w
+]
+
+; -------- dorsal features
+
+[dorsal
+  +=
+    ; VOWELS
+    æ / e / ə / ɑ / ɔ / ɪ̞ / ɛ / ʌ / ʊ̞ / i / u̟ /
+    ; DORSAL PLOSIVES 
+    k / kʼ / kʰ /
+    ; DORSAL FRICATIVES 
+    ç / x /
+    ; DORSAL NASAL OBSTRUENTS
+    ŋ /
+    ; DORSAL RHOTIC LIQUIDS
+    ɹʲ  ɹˤ
+    ; DORSAL GLIDES
+    j
+  -=
+    ; NON-DORSAL PLOSIVES
+    p / pʼ / pʰ / t / tʼ / tʰ ɾ /
+    ; NON-DORSAL AFFRICATES
+    tʃ / dʒ /
+    ; NON-DORSAL FRICATIVES
+    f / v / θ / ð / s / z / ʃ / ʒ /
+    ; NON-DORSAL NASALS
+    m ɱ / n /
+    ; NON-DORSAL LIQUIDS
+    l
+    ; NON-DORSAL RHOTIC LIQUIDS
+    ɹ 
+    ; NON-DORSAL SYLLABIC CONSONANTS
+    m̩ / n̩ / l̩ / ɹ̩
+    ; NON-DORSAL GLIDES
+    w
+]
+
+[high
+  += 
+    ; HIGH VOWELS
+    i / u̟ / ʊ̞ / ɪ̞
+    ; HIGH DORSAL PLOSIVES 
+    k / kʼ / kʰ /
+    ; HIGH DORSAL FRICATIVES 
+    ç / x /
+    ; HIGH DORSAL NASAL OBSTRUENTS
+    ŋ /
+    ; HIGH RHOTIC LIQUIDS
+    ɹʲ  
+    ; HIGH DORSAL GLIDES
+    j / w
+  -= χ / e / o / a
+    ; NON-HIGH VOWELS 
+    ɑ / æ / e / ə / ɛ / ʌ
+    ; NON-HIGH RHOTIC LIQUIDS
+    ɹˤ
+    ; -- NON-DORSALS
+    ; NON-DORSAL PLOSIVES
+    p / pʼ / pʰ / t / tʼ / tʰ ɾ /
+    ; NON-DORSAL AFFRICATES
+    tʃ / dʒ /
+    ; NON-DORSAL FRICATIVES
+    f / v / θ / ð / s / z / ʃ / ʒ /
+    ; NON-DORSAL NASALS
+    m ɱ / n /
+    ; NON-DORSAL LIQUIDS
+    l
+    ; NON-DORSAL RHOTIC LIQUIDS
+    ɹ 
+    ; NON-DORSAL SYLLABIC CONSONANTS
+    m̩ / n̩ / l̩ / ɹ̩
+    ; NON-DORSAL GLIDES
+    w
+]
+
+[low
+  +=
+    ; LOW VOWELS
+    ɑ / æ / ɛ /
+    ; LOW DORSAL RHOTIC LIQUIDS
+    ɹˤ
+  -= a / ɛ / ɔ
+    ; NON-LOW VOWELS
+    i / u̟ / ʊ̞ / ɪ̞ / e / ə / ʌ
+    ; NON-LOW DORSAL PLOSIVES 
+    k / kʼ / kʰ /
+    ; NON-LOW DORSAL FRICATIVES 
+    ç / x /
+    ; NON-LOW DORSAL NASAL OBSTRUENTS
+    ŋ /
+    ; NON-LOW DORSAL RHOTIC LIQUIDS
+    ɹʲ
+    ; DORSAL GLIDES
+    j
+    ; -- NON-DORSALS
+    ; NON-DORSAL PLOSIVES
+    p / pʼ / pʰ / t / tʼ / tʰ ɾ /
+    ; NON-DORSAL AFFRICATES
+    tʃ / dʒ /
+    ; NON-DORSAL FRICATIVES
+    f / v / θ / ð / s / z / ʃ / ʒ /
+    ; NON-DORSAL NASALS
+    m ɱ / n /
+    ; NON-DORSAL LIQUIDS
+    l
+    ; NON-DORSAL RHOTIC LIQUIDS
+    ɹ 
+    ; NON-DORSAL SYLLABIC CONSONANTS
+    m̩ / n̩ / l̩ / ɹ̩
+    ; NON-DORSAL GLIDES
+    w
+]
+[back
+  += 
+    ; BACK VOWELS
+    ɑ / ɔ / ʌ / ʊ̞ / u̟ /
+    ; BACK DORSAL PLOSIVES 
+    k / kʼ / kʰ /
+    ; BACK DORSAL FRICATIVES
+    x /
+    ; BACK DORSAL NASAL OBSTRUENTS
+    ŋ /
+    ; BACK DORSAL RHOTIC LIQUIDS
+    ɹˤ
+  -=
+    ; NON-BACK DORSAL FRICATIVES 
+    ç /
+    ; NON-BACK DORSAL RHOTIC LIQUIDS
+    ɹʲ  
+    ; NON-BACK DORSAL GLIDES
+    j
+    ; NON-BACK VOWELS
+    æ / e / ə / ɪ̞ / ɛ / i
+    ; -- NON-DORSALS
+    ; NON-DORSAL PLOSIVES
+    p / pʼ / pʰ / t / tʼ / tʰ ɾ /
+    ; NON-DORSAL AFFRICATES
+    tʃ / dʒ /
+    ; NON-DORSAL FRICATIVES
+    f / v / θ / ð / s / z / ʃ / ʒ /
+    ; NON-DORSAL NASALS
+    m ɱ / n /
+    ; NON-DORSAL LIQUIDS
+    l
+    ; NON-DORSAL RHOTIC LIQUIDS
+    ɹ 
+    ; NON-DORSAL SYLLABIC CONSONANTS
+    m̩ / n̩ / l̩ / ɹ̩
+    ; NON-DORSAL GLIDES
+    w
+]
+[tense ; compare to ATR or RTR
+  += 
+    ; TENSE VOWELS 
+    e / i / u̟ / ɑ 
+  -=
+    ; NON-TENSE VOWELS 
+    æ / ə / ɪ̞ / ɛ / ʌ / ʊ̞ / ɔ /
+    ; DORSAL PLOSIVES 
+    k / kʼ / kʰ /
+    ; DORSAL FRICATIVES 
+    ç / x /
+    ; DORSAL NASAL OBSTRUENTS
+    ŋ /
+    ; DORSAL RHOTIC LIQUIDS
+    ɹʲ  ɹˤ /
+    ; DORSAL GLIDES
+    j
+    ; -- NON-DORSALS
+    ; NON-DORSAL PLOSIVES
+    p / pʼ / pʰ / t / tʼ / tʰ ɾ /
+    ; NON-DORSAL AFFRICATES
+    tʃ / dʒ /
+    ; NON-DORSAL FRICATIVES
+    f / v / θ / ð / s / z / ʃ / ʒ /
+    ; NON-DORSAL NASALS
+    m ɱ / n /
+    ; NON-DORSAL LIQUIDS
+    l
+    ; NON-DORSAL RHOTIC LIQUIDS
+    ɹ 
+    ; NON-DORSAL SYLLABIC CONSONANTS
+    m̩ / n̩ / l̩ / ɹ̩
+    ; NON-DORSAL GLIDES
+    w
+]
+
+*PROTO
+  ; -- Devoicing, all our z's become s's
+  [+ voice - continuant]>[- voice]/._.
+  ; -- Reduction of schwa
+  ə>0/._.
+|Gif Lang
+
+*PROTO
+  ; -- Ejectivization, all our pits become pit's
+  [+ spreadGlottis - continuant]>[+ constrictedGlottis - spreadGlottis]/._[+ constrictedGlottis]
+  [+ spreadGlottis - continuant]>[+ constrictedGlottis - spreadGlottis]/[+ constrictedGlottis]_.
+  [+ constrictedGlottis]>0/[+ constrictedGlottis - continuant]_.
+  [+ constrictedGlottis]>0/._[+ constrictedGlottis - continuant]
+|Jif Lang
+`
--- a/src/reducers/reducer.js
+++ b/src/reducers/reducer.js
@ -3,7 +3,7 @@ import { addLexeme, setLexicon } from './reducer.lexicon';
 import type { lexiconAction } from './reducer.lexicon';
 import { addEpoch, setEpoch, removeEpoch } from './reducer.epochs';
 import type { epochAction } from './reducer.epochs';
-import { addFeature } from './reducer.features';
+import { addFeature, deleteFeature } from './reducer.features';
 import type { featureAction } from './reducer.features';
 import type { optionsAction } from './reducer.options';
 import { setOptions } from './reducer.options';
@ -12,6 +12,7 @@ import type { resultsAction } from './reducer.results'
 import { initState } from './reducer.init';
 import type { initAction } from './reducer.init';
 import { clearOutput } from './reducer.clear';
+import { setLatl, parseLatl } from './reducer.latl';

 export type stateType = {
  lexicon: Array<{lexeme: string, epoch: epochType}>,
@ -56,8 +57,14 @@ export const stateReducer = (state: stateType, action: actionType): stateType =>

    case 'ADD_FEATURE': return addFeature(state, action);

+    case 'DELETE_FEATURE': return deleteFeature(state, action);
+
    case 'SET_OPTIONS': return setOptions(state, action);

+    case 'SET_LATL': return setLatl(state, action);
+
+    case 'PARSE_LATL': return parseLatl(state, action);
+
    case 'CLEAR': return clearOutput(state, action);

    case 'RUN': return run(state, action);
--- a/src/reducers/reducer.latl.js
+++ b/src/reducers/reducer.latl.js
@ -0,0 +1,529 @@
+import { stateReducer } from './reducer';
+
+export const setLatl = (state, action) => {
+  let latl = action.value;
+  return {...state, latl, parseResults: ''};
+}
+
+const getOneToken = (latl, tokens) => {
+  for (const [type, regEx] of tokenTypes) {
+    const newRegEx = new RegExp(`^(${regEx})`);
+    const match = latl.match(newRegEx) || null;
+    if (match) {
+      const newTokens = [...tokens, {type, value: match[0].trim()}]
+      const newLatl = latl.slice(match[0].length ,);
+      return [newLatl, newTokens]
+    }
+  }
+  throw `Unexpected token at ${latl.split('\n')[0]}` 
+}
+
+export const tokenize = latl => {
+  let i = 0;
+  let tokens = [];
+  let newLatl = latl.trim();
+  try {
+    while(newLatl.length) {
+      [newLatl, tokens] = getOneToken(newLatl, tokens)
+    }
+    return tokens;
+  } 
+  catch (err) {
+    return {errors: 'tokenization error', message: err, newLatl}
+  }
+}
+
+const parseLineBreak = (tree, token, index, tokens) => {
+  const lastNode = tree[tree.length - 1];
+  if (!lastNode) return tree;
+  switch (lastNode.type) {
+    case 'rule': {
+      if (tree[tree.length - 2].type === 'ruleSet') {
+        const ruleValue = lastNode.value;
+        tree[tree.length - 2].value.push(ruleValue);
+        tree.pop()
+        return tree;
+      }
+      if (tree[tree.length - 2].type === 'epoch') {
+        const newNode = { type: 'ruleSet', value: [ lastNode.value ] }
+        tree[tree.length - 1] = newNode;
+        return tree;
+      }
+    }
+    case 'feature--plus': {
+      // tree[tree.length - 1].type === 'feature';
+      return tree;
+    }
+    case 'feature--minus': {
+      // tree[tree.length - 1].type === 'feature';
+      return tree;
+    }
+    default:
+      return tree;
+  }
+}
+
+const parseWhiteSpace = (tree, token, index, tokens) => {
+  const lastNode = tree[tree.length - 1];
+  switch (lastNode.type) {
+    case 'rule': {
+      tree[tree.length - 1] = {...lastNode, value: lastNode.value + ' ' }
+      return tree;
+    }
+    default:
+      return tree;
+  }
+}
+
+const parseStar = (tree, token, index, tokens) => {
+  const nextToken = tokens[index + 1];
+  if (nextToken.type === 'referent') {
+    return [...tree, { type: 'epoch-parent' }]
+  }
+}
+
+const parsePipe = (tree, token, index, tokens) => {
+  const nextToken = tokens[index + 1];
+  if (nextToken.type === 'referent') {
+    const ruleToken = tree[tree.length - 1];
+    const epochToken = tree[tree.length - 2];
+    if (ruleToken.type === 'rule' || ruleToken.type === 'ruleSet') {
+      if (epochToken.type === 'epoch') {
+        tree[tree.length - 2] = {
+          ...epochToken,
+          changes: [...ruleToken.value],
+          type: 'epoch-name'
+        }
+        tree.pop();
+        return tree;
+      }
+    }
+  }
+  return [...tree, 'unexpected pipe']
+}
+
+const parseReferent = (tree, token, index, tokens) => {
+  const lastNode = tree[tree.length - 1];
+  switch (lastNode.type) {
+    case 'epoch-parent': {
+      tree[tree.length - 1] = {...lastNode, parent: token.value, type: 'epoch' }
+      return tree;
+    }
+    case 'epoch-name': {
+      tree[tree.length - 1] = {...lastNode, name: token.value, type: 'epoch' }
+      return [...tree, { type: 'main'}];
+    }
+    case 'epoch': {
+      return [...tree, { type: 'rule', value: token.value } ]
+    }
+    case 'rule': {
+      tree[tree.length - 1] = {...lastNode, value: lastNode.value + token.value }
+      return tree;
+    }
+    case 'ruleSet': {
+      return [...tree, { type: 'rule', value: token.value }]
+    }
+    case 'feature': {
+      if (!lastNode.value) {
+        tree[tree.length - 1].value = token.value;
+        return tree;
+      }
+    }
+    case 'feature--plus': {
+      if (lastNode.value) {
+        lastNode.positivePhones = [...lastNode.positivePhones, token.value ]
+      }
+      else {
+        lastNode.value = token.value;
+      }
+      tree[tree.length - 1] = lastNode;
+      return [...tree]
+    }
+    case 'feature--minus': {
+      if (lastNode.value) {
+        lastNode.negativePhones = [...lastNode.negativePhones, token.value ]
+      }
+      else {
+        lastNode.value = token.value;
+      }
+      tree[tree.length - 1] = lastNode;
+      return [...tree]
+    }
+    case 'lexicon': {
+      if (!lastNode.epoch) {
+        tree[tree.length - 1].epoch = token.value;
+      }
+      else {
+        tree[tree.length - 1].value.push(token.value)
+      }
+      return tree;
+    }
+    default:
+      return [...tree, `unexpected referent ${token.value}`]
+    }
+  }
+  
+const parsePhone = (tree, token, index, tokens) => {
+  const lastNode = tree[tree.length - 1];
+  switch(lastNode.type) {
+    case 'rule': {
+      tree[tree.length - 1] = {...lastNode, value: lastNode.value + token.value }
+      return tree;
+    }
+    case 'ruleSet': {
+      return [...tree, { type: 'rule', value: token.value }]
+    }
+    case 'feature--plus':
+      lastNode.positivePhones = [...lastNode.positivePhones, token.value ];
+      tree[tree.length - 1] = lastNode;
+      return tree;
+    case 'feature--minus':
+      lastNode.negativePhones = [...lastNode.negativePhones, token.value ];
+      tree[tree.length - 1] = lastNode;
+      return tree;
+    default:
+      return [...tree, `unexpected phone ${token.value}`]
+  }
+}
+  
+const parseOpenBracket = (tree, token, index, tokens) => {
+  const lastNode = tree[tree.length - 1];
+  if (lastNode) {
+    switch (lastNode.type) {
+      case 'epoch':
+        return [...tree, {type: 'rule', value: token.value}]
+      case 'rule':
+        tree[tree.length - 1] = {...lastNode, value: lastNode.value + token.value }
+        return tree;
+      case 'ruleSet':
+        return [...tree, {type: 'rule', value: token.value}];
+      // case 'feature':
+      //   return [{type: 'feature', positivePhones: [], negativePhones: []}];
+      case 'feature--plus':
+        return [...tree, {type: 'feature', positivePhones: [], negativePhones: []}];
+      case 'feature--minus':
+        return [...tree, {type: 'feature', positivePhones: [], negativePhones: []}];
+      case 'main':
+        return [...tree, {type: 'feature', positivePhones: [], negativePhones: []}];
+      default:
+        return [...tree, 'unexpected open bracket']
+    }
+  }
+  return [{type: 'feature', positivePhones: [], negativePhones: []}]
+}
+      
+const parseCloseBracket = (tree, token, index, tokens) => {
+  const lastNode = tree[tree.length - 1];
+  switch (lastNode.type) {
+    case 'rule':
+      tree[tree.length - 1] = {...lastNode, value: lastNode.value + token.value }
+      return tree;
+    case 'feature--plus':
+      return tree;
+    case 'feature--minus':
+      return tree;
+    default:
+      return [...tree, 'unexpected close bracket']
+  }
+}
+
+const parsePositiveAssignment = (tree, token, index, tokens) => {
+  const lastNode = tree[tree.length - 1];
+  switch (lastNode.type) {
+    case 'feature':
+      tree[tree.length - 1].type = 'feature--plus'
+      return tree;
+    default:
+      return [...tree, 'unexpected positive assignment']
+  }
+}
+
+const parseNegativeAssignment = (tree, token, index, tokens) => {
+  const lastNode = tree[tree.length - 1];
+  switch (lastNode.type) {
+    case 'feature':
+      tree[tree.length - 1].type = 'feature--minus'
+      return tree;
+    case 'feature--plus':
+      tree[tree.length - 1].type = 'feature--minus';
+      return tree;
+    default:
+      return [...tree, 'unexpected negative assignment']
+  }
+}
+
+const parsePlus = (tree, token, index, tokens) => {
+  const lastNode = tree[tree.length - 1];
+  switch (lastNode.type) {
+    case 'rule':
+      tree[tree.length - 1] = {...lastNode, value: lastNode.value + token.value}
+      return tree;
+    case 'feature':
+      tree[tree.length - 1] = {...lastNode, type: 'feature--plus'}
+      return tree;
+    case 'feature--minus':
+      tree[tree.length - 1] = {...lastNode, type: 'feature--minus'}
+      return tree;
+    default:
+      return [...tree, 'unexpected plus']
+  }
+}
+    
+const parseMinus = (tree, token, index, tokens) => {
+  const lastNode = tree[tree.length - 1];
+  switch (lastNode.type) {
+    case 'rule':
+      tree[tree.length - 1] = {...lastNode, value: lastNode.value + token.value}
+      return tree;
+    case 'feature':
+      tree[tree.length - 1] = {...lastNode, type: 'feature--minus'}
+      return tree;
+    default:
+      return [...tree, 'unexpected minus']
+  }
+}
+
+const parseEqual = (tree, token, index, tokens) => {
+  const lastNode = tree[tree.length - 1];
+  switch (lastNode.type) {
+    case 'feature--plus':
+      return tree;
+    case 'feature--minus':
+      return tree;
+    default:
+      return [...tree, 'unexpected equal'];
+  }
+}
+
+const parseGreaterThan = (tree, token, index, tokens) => {
+  const lastNode = tree[tree.length - 1];
+  switch (lastNode.type) {
+    case 'rule':
+      tree[tree.length - 1] = {...lastNode, value: lastNode.value + token.value}
+      return tree;
+    default:
+      return [...tree, 'unexpected greater than']
+  }
+}
+
+const parseSlash = (tree, token, index, tokens) => {
+  const lastNode = tree[tree.length - 1];
+  if (lastNode) {
+    switch (lastNode.type) {
+      case 'rule':
+        tree[tree.length - 1] = {...lastNode, value: lastNode.value + token.value}
+        return tree;
+      case 'feature--plus':
+        return tree;
+      case 'feature--minus':
+        return tree;
+      case 'lexicon':
+        return [...tree, { }];
+      case 'main':
+        return [...tree, { type: 'lexicon', value: []}]
+      default:
+        return [...tree, 'unexpected slash']
+    }
+  }
+  return [...tree, { type: 'lexicon', value: []}]
+}
+    
+const parseHash = (tree, token, index, tokens) => {
+  const lastNode = tree[tree.length - 1];
+  switch (lastNode.type) {
+    case 'rule':
+      tree[tree.length - 1] = {...lastNode, value: lastNode.value + token.value}
+      return tree;
+    default:
+      return [...tree, 'unexpected hash']
+  }
+}
+
+const parseDot = (tree, token, index, tokens) => {
+  const lastNode = tree[tree.length - 1];
+  switch (lastNode.type) {
+    case 'rule':
+      tree[tree.length - 1] = {...lastNode, value: lastNode.value + token.value}
+      return tree;
+    default:
+      return [...tree, 'unexpected dot']
+  }
+}
+
+const parseUnderScore = (tree, token, index, tokens) => {
+  const lastNode = tree[tree.length - 1];
+  switch (lastNode.type) {
+    case 'rule':
+      tree[tree.length - 1] = {...lastNode, value: lastNode.value + token.value}
+      return tree;
+    default:
+      return [...tree, 'unexpected underscore']
+  }
+}
+
+const generateNode = (tree, token, index, tokens) => {
+  switch (token.type) {
+    // if comment, consume without effect
+    case 'semicolon':
+      return [...tree]
+    case 'lineBreak':
+      return parseLineBreak(tree, token, index, tokens);
+    case 'whiteSpace':
+      return parseWhiteSpace(tree, token, index, tokens);
+    // if *PROTO consume token:* and add epochs: [ { parent: 'PROTO' } ]
+    case 'star': 
+      return parseStar(tree, token, index, tokens);
+    case 'pipe':
+      return parsePipe(tree, token, index, tokens);
+    case 'referent':
+      return parseReferent(tree, token, index, tokens);
+    case 'phone':
+      return parsePhone(tree, token, index, tokens);
+    case 'openBracket':
+      return parseOpenBracket(tree, token, index, tokens);
+    case 'closeBracket':
+      return parseCloseBracket(tree, token, index, tokens);
+    case 'positiveAssignment':
+      return parsePositiveAssignment(tree, token, index, tokens);
+    case 'negativeAssignment':
+      return parseNegativeAssignment(tree, token, index, tokens);
+    case 'plus':
+      return parsePlus(tree, token, index, tokens);
+    case 'minus':
+      return parseMinus(tree, token, index, tokens);
+    case 'equal':
+      return parseEqual(tree, token, index, tokens);
+    case 'greaterThan':
+      return parseGreaterThan(tree, token, index, tokens);
+    case 'slash':
+      return parseSlash(tree, token, index, tokens);
+    case 'hash':
+      return parseHash(tree, token, index, tokens);
+    case 'dot':
+      return parseDot(tree, token, index, tokens);
+    case 'underscore':
+      return parseUnderScore(tree, token, index, tokens);
+    default:
+      return [...tree, { ...token }]
+  }
+}
+
+const addToken = (tree, token, index, tokens) => generateNode(tree, token, index, tokens);
+
+const connectNodes = (tree, node, index, nodes) => {
+  switch (node.type) {
+    case 'epoch':
+      delete node.type;
+      return {...tree, epochs: [...tree.epochs, {...node, index: tree.epochs.length } ] }
+    case 'feature':
+      node.feature = node.value;
+      delete node.value;    
+      delete node.type;
+      return {...tree, features: [...tree.features, {...node } ] }
+    case 'feature--minus':
+      node.feature = node.value;
+      delete node.value;    
+      delete node.type;
+      if (tree.features.length && tree.features[tree.features.length - 1].feature === node.feature) {
+        tree.features[tree.features.length - 1].negativePhones = node.negativePhones
+        return tree;
+      }
+      return {...tree, features: [...tree.features, {...node} ] }
+    case 'feature--plus':
+      delete node.type;
+      node.feature = node.value;
+      delete node.value;
+      if (tree.features.length && tree.features[tree.features.length - 1].feature === node.feature) {
+        tree.features[tree.features.length - 1].positivePhones = node.positivePhones
+        return tree;
+      }
+      return {...tree, features: [...tree.features, {...node} ] }
+    case 'lexicon':
+      delete node.type;
+      return {...tree, lexicon: [...tree.lexicon, node]}
+    default:
+      return tree;
+  }
+}
+
+export const buildTree = tokens => {
+  const bareTree = {
+    epochs: [],
+    features: [],
+    lexicon: []
+  }
+  const nodes = tokens.reduce(addToken, []);
+  // return nodes
+  const tree = nodes.reduce(connectNodes, bareTree);
+  const filterProps = Object.entries(tree).filter(([key, value]) => !value.length)
+    .map(([key, value]) => key)
+  return filterProps.reduce((tree, badProp) => {
+    delete tree[badProp];
+    return tree;
+  }, tree);
+}
+
+export const generateAST = latl => {
+  // tokenize
+  const tokens = tokenize(latl.trim());
+  // build tree
+  const tree = buildTree(tokens);
+  return tree;
+}
+
+export const parseLatl = (state, action) => {
+  try {
+    const latl = state.latl;
+    const AST = generateAST(latl);
+    const features = AST.features;
+    if (features) {
+      if (state.features) {
+        state = Object.keys(state.features).reduce((state, feature) => {
+          return stateReducer(state, {type: 'DELETE_FEATURE', value: feature})
+        }, state)
+      }
+      state = features.reduce((state, feature) => stateReducer(state, {type:'ADD_FEATURE', value: feature}), state);
+    }
+    delete AST.features;
+    const lexicon = AST.lexicon;
+    if (lexicon) {
+      if (state.lexicon) {
+        state.lexicon = [];
+      }
+      state = lexicon.reduce((state, epoch) => {
+        return epoch.value.reduce((reducedState, lexeme) => {
+          return stateReducer(reducedState, {type: 'ADD_LEXEME', value: { lexeme, epoch: epoch.epoch }})
+        }, state)
+      }, state)
+    }
+    delete AST.lexicon;
+    Object.entries(AST).forEach(([key, value]) => state[key] = value);
+    return { ...state, parseResults: 'latl parsed successfully', results:[] }
+  }
+  catch (e) {
+    console.log(e)
+    return { ...state, parseResults: 'error parsing', errors: e}
+  }
+}
+
+const tokenTypes = [
+  ['semicolon', ';.*\n'],
+  [`star`, `\\*`],
+  ['pipe', `\\|`],
+  ['openBracket', `\\[`],
+  ['closeBracket', `\\]`],
+  ['positiveAssignment', `\\+=`],
+  ['negativeAssignment', `\\-=`],
+  ['plus', `\\+`],
+  ['minus', `\\-`],
+  ['greaterThan', `\\>`],
+  ['hash', `#`],
+  ['slash', `\/`],
+  ['dot', `\\.`],
+  ['underscore', `\\_`],
+  [`referent`, `[A-Za-z]+[\u00c0-\u03FFA-Za-z0-9\\-\\_]*`],
+  [`phone`, `[\u00c0-\u03FFA-Za-z0]+`],
+  ['equal', `=`],
+  [`lineBreak`, `\\n`],
+  [`whiteSpace`, `\\s+`]
+]
--- a/src/reducers/reducer.latl.test.js
+++ b/src/reducers/reducer.latl.test.js
@ -0,0 +1,520 @@
+import { stateReducer } from './reducer';
+import { initState } from './reducer.init';
+import { tokenize, buildTree, parseLatl } from './reducer.latl';
+
+describe('LATL', () => {
+  it('returns state unaltered with no action body', () => {
+    const state = initState();
+    const action = {
+      type: 'SET_LATL',
+      value: ''
+    }
+    const returnedState = stateReducer(state, action)
+    expect(returnedState).toStrictEqual(state);
+  })
+
+  it('returns tokens from well-formed latl epoch definition', () => {
+    const tokens = tokenize(epochDefinitionLatl);
+    expect(tokens).toStrictEqual(tokenizedEpoch)
+  });
+  
+  it('returns tokens from well-formed latl feature definition', () => {
+    const tokens = tokenize(featureDefinitionLatl);
+    expect(tokens).toStrictEqual(tokenizedFeature);
+  });
+
+  it('returns tokens from well-formed latl lexicon definition', () => {
+    const tokens = tokenize(lexiconDefinitionLatl);
+    expect(tokens).toStrictEqual(tokenizedLexicon);
+  });
+  
+  it('returns tokens from well-formed latl epoch, feature, and lexicon definitions', () => {
+    const latl = epochDefinitionLatl + '\n' + featureDefinitionLatl + '\n' + lexiconDefinitionLatl;
+    const tokens = tokenize(latl);
+    const lineBreaks = [{ type: 'lineBreak', value: '' },{ type: 'lineBreak', value: '' },{ type: 'lineBreak', value: '' }]
+    const tokenizedLatl = [...tokenizedEpoch, ...lineBreaks, ...tokenizedFeature, ...lineBreaks, ...tokenizedLexicon];
+    expect(tokens).toStrictEqual(tokenizedLatl);
+  });
+
+  it('returns AST from well-formed epoch tokens', () => {
+    const tree = buildTree(tokenizedEpoch);
+    expect(tree).toStrictEqual(treeEpoch);
+  })
+
+  it('returns AST from well-formed feature tokens', () => {
+    const tree = buildTree(tokenizedFeature);
+    expect(tree).toStrictEqual(treeFeature);
+  })
+
+  it('returns AST from well-formed lexicon tokens', () => {
+    const tree = buildTree(tokenizedLexicon);
+    expect(tree).toStrictEqual(treeLexicon);
+  })
+
+  it('parse returns state from well-formed feature latl', () => {
+    const state = initState();
+    const setAction = {
+      type: 'SET_LATL',
+      value: featureDefinitionLatl
+    }
+    const latlState = stateReducer(state, setAction);
+    const parseState = parseLatl(latlState, {});
+    expect(parseState).toStrictEqual(featureState)
+  })
+
+  it('returns run from well-formed epoch latl', () => {
+    const state = initState();
+    const setAction = {
+      type: 'SET_LATL',
+      value: runEpochLatl
+    }
+    const latlState = stateReducer(state, setAction);
+    const parseState = parseLatl(latlState, {})
+    // expect(parseState).toStrictEqual(epochState);
+    parseState.lexicon[0].epoch = 'PROTO'
+    const runState = stateReducer(parseState, {type: 'RUN', value:{}})
+    expect(runState).toStrictEqual({...runState, results: runEpochResults})
+  })
+
+  it('returns state from well-formed lexicon latl', () => {
+    const state = initState();
+    const setAction = {
+      type: 'SET_LATL',
+      value: lexiconDefinitionLatl
+    }
+    const latlState = stateReducer(state, setAction);
+    const parseState = parseLatl(latlState, {});
+    expect(parseState).toStrictEqual(lexiconState)
+
+  })
+
+  // it('returns state from well formed latl', () => {
+  //   const state = initState();
+  //   const setAction = {
+  //     type: 'SET_LATL',
+  //     value: totalLatl
+  //   }
+  //   const latlState = stateReducer(state, setAction);
+  //   const parseState = parseLatl(latlState, {});
+  //   expect(parseState).toStrictEqual(totalLatlState)
+  // })
+
+})
+const epochDefinitionLatl = `
+; comment
+*PROTO
+  [+ FEATURE]>[- FEATURE]/._.
+  n>m/#_.
+|CHILD
+`
+
+const runEpochLatl = `
+; comment
+*PROTO
+  a>u/._.
+|epoch-1
+`
+
+const runEpochResults = [
+  {
+    pass: 'epoch-1',
+    parent: 'PROTO',
+    lexicon: [ 'untu', 'unut', 'unət', 'unnu', 'tun', 'əntu' ]
+  }
+]
+
+const tokenizedEpoch = [ 
+  { type: "semicolon", value: "; comment" },
+  { type: "star", value: "*" }, { type: "referent", value: "PROTO" }, { type: 'lineBreak', value: '' }, { type: "whiteSpace", value: "" },
+    { type: "openBracket", value: "[" }, { type: "plus", value: "+" }, { type: "whiteSpace", value: "" }, { type: "referent", value: "FEATURE" }, { type: "closeBracket", value: "]" }, 
+      { type: "greaterThan", value: ">" }, { type: "openBracket", value: "[" }, { type: "minus", value: "-" }, { type: "whiteSpace", value: "" }, { type: "referent", value: "FEATURE" }, { type: "closeBracket", value: "]" }, 
+      { type: "slash", value: "/" }, { type: "dot", value: "." }, 
+      { type: "underscore", value: "_" }, { type: "dot", value: "." }, { type: 'lineBreak', value: '' }, { type: "whiteSpace", value: "" },
+    { type: "referent", value: "n" },
+      { type: "greaterThan", value: ">" }, { type: "referent", value: "m" },
+      { type: "slash", value: "/" }, { type: "hash", value: "#" },
+      { type: "underscore", value: "_" }, { type: "dot", value: "." }, { type: 'lineBreak', value: '' },
+  { type: "pipe", value: "|" }, { type: "referent", value: "CHILD" }
+]
+
+const treeEpoch = {
+  epochs: [
+    {
+      parent: 'PROTO',
+      name: 'CHILD',
+      index: 0,
+      changes: [
+        '[+ FEATURE]>[- FEATURE]/._.',
+        'n>m/#_.'
+      ]
+    }
+  ]
+}
+
+const epochState = {
+  ...initState(),
+  epochs: treeEpoch.epochs,
+  latl: epochDefinitionLatl
+}
+
+const featureDefinitionLatl = `
+[+ PLOSIVE] = kp/p/b/d/t/g/k
+[- PLOSIVE] = m/n/s/z
+[SONORANT
+  += m/n
+  -= s/z/kp/p/b/d/t/g/k
+]
+`
+
+const tokenizedFeature = [
+  {type: "openBracket", value: "[" }, { type: "plus", value: "+" }, { type: "whiteSpace", value: "" }, { type: "referent", value: "PLOSIVE" }, { type: "closeBracket", value: "]" }, { type: "whiteSpace", value: "" },
+    { type: "equal", value: "=" }, { type: "whiteSpace", value: "" }, { type: "referent", value: "kp" }, { type: "slash", value: "/" }, { type: "referent", value: "p" }, { type: "slash", value: "/" }, { type: "referent", value: "b" }, { type: "slash", value: "/" }, { type: "referent", value: "d" }, { type: "slash", value: "/" }, { type: "referent", value: "t" }, { type: "slash", value: "/" }, { type: "referent", value: "g" }, { type: "slash", value: "/" }, { type: "referent", value: "k" }, { type: 'lineBreak', value: '' },
+  {type: "openBracket", value: "[" }, { type: "minus", value: "-" }, { type: "whiteSpace", value: "" }, { type: "referent", value: "PLOSIVE" }, { type: "closeBracket", value: "]" }, { type: "whiteSpace", value: "" },
+    { type: "equal", value: "=" }, { type: "whiteSpace", value: "" }, { type: "referent", value: "m" }, { type: "slash", value: "/" }, { type: "referent", value: "n" }, { type: "slash", value: "/" }, { type: "referent", value: "s" }, { type: "slash", value: "/" }, { type: "referent", value: "z" }, { type: 'lineBreak', value: '' },
+  {type: "openBracket", value: "[" }, { type: "referent", value: "SONORANT" }, { type: 'lineBreak', value: '' },
+    { type: "whiteSpace", value: "" }, { type: "positiveAssignment", value: "+=" }, { type: "whiteSpace", value: "" },
+      { type: "referent", value: "m" }, { type: "slash", value: "/" }, { type: "referent", value: "n" }, { type: 'lineBreak', value: '' },
+    { type: "whiteSpace", value: "" }, { type: "negativeAssignment", value: "-=" }, { type: "whiteSpace", value: "" },
+      { type: "referent", value: "s" }, { type: "slash", value: "/" }, { type: "referent", value: "z" }, { type: "slash", value: "/" }, { type: "referent", value: "kp" }, { type: "slash", value: "/" }, { type: "referent", value: "p" }, { type: "slash", value: "/" }, { type: "referent", value: "b" }, { type: "slash", value: "/" }, { type: "referent", value: "d" }, { type: "slash", value: "/" }, { type: "referent", value: "t" }, { type: "slash", value: "/" }, { type: "referent", value: "g" }, { type: "slash", value: "/" }, { type: "referent", value: "k" }, { type: 'lineBreak', value: '' },
+    { type: "closeBracket", value: "]" },
+]
+
+const treeFeature = { features: [
+  {
+    feature: 'PLOSIVE',
+    positivePhones: ['kp', 'p', 'b', 'd', 't', 'g', 'k'],
+    negativePhones: ['m', 'n', 's', 'z']
+  },
+  {
+    feature: 'SONORANT',
+    positivePhones: ['m', 'n'],
+    negativePhones: ['s' ,'z' ,'kp' ,'p' ,'b' ,'d' ,'t' ,'g' ,'k']
+  }
+]}
+
+const featureState = {
+  ...initState(),
+  features: {
+    PLOSIVE: {
+      negative:  [
+        {
+          features: {
+            PLOSIVE: false,
+            SONORANT: true,
+      },
+        grapheme: "m",
+    },
+     {
+          features: {
+            PLOSIVE: false,
+          SONORANT: true,
+      },
+        grapheme: "n",
+    },
+     {
+          features: {
+            PLOSIVE: false,
+          SONORANT: false,
+      },
+        grapheme: "s",
+    },
+     {
+          features: {
+            PLOSIVE: false,
+          SONORANT: false,
+      },
+        grapheme: "z",
+    },
+  ],
+    positive:  [
+       {
+          features: {
+            PLOSIVE: true,
+      },
+        grapheme: "kp",
+    },
+     {
+          features: {
+            PLOSIVE: true,
+          SONORANT: false,
+      },
+        grapheme: "p",
+    },
+     {
+          features: {
+            PLOSIVE: true,
+          SONORANT: false,
+      },
+        grapheme: "b",
+    },
+     {
+          features: {
+            PLOSIVE: true,
+          SONORANT: false,
+      },
+        grapheme: "d",
+    },
+     {
+          features: {
+            PLOSIVE: true,
+          SONORANT: false,
+      },
+        grapheme: "t",
+        ʰ: {
+            features: {},
+          grapheme: "tʰ",
+      },
+    },
+     {
+          features: {
+            PLOSIVE: true,
+          SONORANT: false,
+      },
+        grapheme: "g",
+    },
+     {
+          features: {
+            PLOSIVE: true,
+          SONORANT: false,
+      },
+        grapheme: "k",
+        p: {
+            features: {
+              SONORANT: false,
+        },
+          grapheme: "kp",
+      },
+    },
+  ],
+},
+  SONORANT: {
+      negative:  [
+       {
+          features: {
+            PLOSIVE: false,
+          SONORANT: false,
+      },
+        grapheme: "s",
+    },
+     {
+          features: {
+            PLOSIVE: false,
+          SONORANT: false,
+      },
+        grapheme: "z",
+    },
+     {
+          features: {
+            SONORANT: false,
+      },
+        grapheme: "kp",
+    },
+     {
+          features: {
+            PLOSIVE: true,
+          SONORANT: false,
+      },
+        grapheme: "p",
+    },
+     {
+          features: {
+            PLOSIVE: true,
+          SONORANT: false,
+      },
+        grapheme: "b",
+    },
+     {
+          features: {
+            PLOSIVE: true,
+          SONORANT: false,
+      },
+        grapheme: "d",
+    },
+     {
+          features: {
+            PLOSIVE: true,
+          SONORANT: false,
+      },
+        grapheme: "t",
+        ʰ: {
+            features: {},
+          grapheme: "tʰ",
+      },
+    },
+     {
+          features: {
+            PLOSIVE: true,
+          SONORANT: false,
+      },
+        grapheme: "g",
+    },
+     {
+          features: {
+            PLOSIVE: true,
+          SONORANT: false,
+      },
+        grapheme: "k",
+        p: {
+            features: {
+              SONORANT: false,
+        },
+          grapheme: "kp",
+      },
+    },
+  ],
+    positive:  [
+       {
+          features: {
+            PLOSIVE: false,
+          SONORANT: true,
+      },
+        grapheme: "m",
+    },
+     {
+          features: {
+            PLOSIVE: false,
+          SONORANT: true,
+      },
+        grapheme: "n",
+    },
+  ],
+},  },
+  parseResults: 'latl parsed successfully',
+  latl: featureDefinitionLatl,
+  phones: {
+    a: {
+        features: {},
+      grapheme: "a",
+  },
+    b: {
+        features: {
+          PLOSIVE: true,
+        SONORANT: false,
+    },
+      grapheme: "b",
+  },
+    d: {
+        features: {
+          PLOSIVE: true,
+        SONORANT: false,
+    },
+      grapheme: "d",
+  },
+    g: {
+        features: {
+          PLOSIVE: true,
+        SONORANT: false,
+    },
+      grapheme: "g",
+  },
+    k: {
+        features: {
+          PLOSIVE: true,
+        SONORANT: false,
+    },
+      grapheme: "k",
+      p: {
+          features: {
+            SONORANT: false,
+      },
+        grapheme: "kp",
+    },
+  },
+    m: {
+        features: {
+          PLOSIVE: false,
+        SONORANT: true,
+    },
+      grapheme: "m",
+  },
+    n: {
+        features: {
+          PLOSIVE: false,
+        SONORANT: true,
+    },
+      grapheme: "n",
+  },
+    p: {
+        features: {
+          PLOSIVE: true,
+        SONORANT: false,
+    },
+      grapheme: "p",
+  },
+    s: {
+        features: {
+          PLOSIVE: false,
+        SONORANT: false,
+    },
+      grapheme: "s",
+  },
+    t: {
+        features: {
+          PLOSIVE: true,
+        SONORANT: false,
+    },
+      grapheme: "t",
+      ʰ: {
+          features: {},
+        grapheme: "tʰ",
+    },
+  },
+    u: {
+        features: {},
+      grapheme: "u",
+  },
+    z: {
+        features: {
+          PLOSIVE: false,
+        SONORANT: false,
+    },
+      grapheme: "z",
+  },
+    ə: {
+        features: {},
+      grapheme: "ə",
+  },
+    ɯ: {
+        features: {},
+      grapheme: "ɯ",
+  },
+  }
+}
+
+const lexiconDefinitionLatl = `
+/PROTO
+  kpn
+  sm
+/
+`
+
+const tokenizedLexicon = [
+  { type: "slash", value: "/" }, { type: "referent", value: "PROTO" }, { type: 'lineBreak', value: '' },
+    { type: "whiteSpace", value:"" }, { type: "referent", value: "kpn" }, { type: 'lineBreak', value: '' },
+    { type: "whiteSpace", value:"" }, { type: "referent", value: "sm" }, { type: 'lineBreak', value: '' },
+  { type: "slash", value: "/" }
+]
+
+const treeLexicon = {lexicon: [{epoch: "PROTO", value: ["kpn", "sm"]}]};
+
+const lexiconState = {
+  ...initState(),
+  latl: lexiconDefinitionLatl,
+  lexicon: [
+    { lexeme: 'kpn', epoch: 'PROTO'},
+    { lexeme: 'sm', epoch: 'PROTO'}
+  ],
+  parseResults: 'latl parsed successfully'
+}
+
+const totalLatl = `${epochDefinitionLatl}\n\n${featureDefinitionLatl}\n\n${lexiconDefinitionLatl}`
+
+const totalLatlState = {
+  ...initState(),
+  latl: totalLatl,
+  phonemes: {},
+  features: featureState.features,
+  epochs: treeEpoch.epochs,
+  lexicon: lexiconState.lexicon,
+  parseResults: 'latl parsed successfully'
+}
--- a/src/reducers/reducer.lexicon.js
+++ b/src/reducers/reducer.lexicon.js
@ -20,8 +20,10 @@ const makeLexeme = (lexeme: string, epochName: ?string, state: stateType) => {
  const newLexeme = {lexeme: lexeme, epoch: state.epochs[0]};
  if (epochName) {
    const epochIndex = state.epochs.findIndex(epoch => epoch.name === epochName);
-    if (epochIndex > 0) {
+    if (epochIndex > -1) {
      newLexeme.epoch = state.epochs[epochIndex];
+    } else {
+      newLexeme.epoch = epochName;
    };
  }
  return newLexeme;
--- a/src/reducers/reducer.lexicon.test.js
+++ b/src/reducers/reducer.lexicon.test.js
@ -3,8 +3,8 @@ import {stateReducer} from './reducer';
 describe('Lexicon', () => {
  const state = {
    epochs: [
-      { name: 'epoch 1', changes:[''] }, 
-      { name: 'epoch 2', changes:[''] }
+      { name: 'epoch-1', changes:[''] }, 
+      { name: 'epoch-2', changes:[''] }
    ]
  }
  state.lexicon = [
@ -28,16 +28,16 @@ describe('Lexicon', () => {
  });
  
  it('lexicon addition with epoch returns updated lexicon with correct epoch', () => {
-    const action = {type: 'ADD_LEXEME', value: {lexeme:'ntʰa', epoch: 'epoch 2'}}
+    const action = {type: 'ADD_LEXEME', value: {lexeme:'ntʰa', epoch: 'epoch-2'}}
    expect(stateReducer(state, action)).toEqual({...state, lexicon:[...state.lexicon, {lexeme:'ntʰa', epoch:state.epochs[1]}]});  
  });

  it('lexicon set returns updated lexicon with correct epoch', () => {
    const newLexicon = [
-      {lexeme:'anta', epoch:'epoch 1'},
-      {lexeme:'anat', epoch:'epoch 1'},
-      {lexeme:'anət', epoch:'epoch 1'},
-      {lexeme:'anna', epoch:'epoch 1'}
+      {lexeme:'anta', epoch:'epoch-1'},
+      {lexeme:'anat', epoch:'epoch-1'},
+      {lexeme:'anət', epoch:'epoch-1'},
+      {lexeme:'anna', epoch:'epoch-1'}
    ]
    const action = {type: 'SET_LEXICON', value: newLexicon}
    expect(stateReducer(state, action)).toEqual({...state, lexicon:[
@ -58,7 +58,7 @@ describe('Lexicon', () => {
    const inputLexicon = [
      {lexeme:'anta'},
      {lexeme:'anat'},
-      {lexeme:'anət', epoch:'epoch 2'},
+      {lexeme:'anət', epoch:'epoch-2'},
      {lexeme:'anna'}
    ]
    const action = {type: 'SET_LEXICON', value: inputLexicon}
--- a/src/reducers/reducer.results.js
+++ b/src/reducers/reducer.results.js
@ -32,7 +32,8 @@ const findFeaturesFromLexeme = (phones: {}, lexeme:string): [] => {
  let lastIndex = lexeme.length - 1;
  let node = {};
  [...lexeme].forEach((graph, index) => {
-    if (!index) return node = phones[graph]
+    try {
+    if (!index ) return node = phones[graph]
    if (index === lastIndex) return node[graph] 
      ? featureBundle.push(node[graph])
      : featureBundle.push(node, phones[graph])
@ -40,8 +41,12 @@ const findFeaturesFromLexeme = (phones: {}, lexeme:string): [] => {
      featureBundle.push(node)
      return node = phones[graph]
    }
-    if (!node[graph])
+    if (!node) return node = phones[graph]
    return node = node[graph]
+    }
+    catch (e) {
+      throw {e, 'phones[graph]':phones[graph], index, lexeme }
+    }
  })
  return featureBundle;
 }
@ -211,7 +216,7 @@ const transformLexemeInitial = (newLexeme, pre, post, position, phoneme, index,
  if (!isEnvironmentBoundByRule(lexemeBundle.slice(index + position.length, index + post.length + position.length), post)) return [...newLexeme, phoneme];
  const newPhoneme = transformPhoneme(phoneme, newFeatures[0], features);
  // if deletion occurs
-  if (!newPhoneme.grapheme) return [ ...newLexeme] ;
+  if (!newPhoneme || !newPhoneme.grapheme) return [ ...newLexeme] ;
  return [...newLexeme, newPhoneme];
 }

@ -221,7 +226,7 @@ const transformLexemeCoda = (newLexeme, pre, post, position, phoneme, index, lex
  if (!isEnvironmentBoundByRule([phoneme], position)) return [...newLexeme, phoneme];
  const newPhoneme = transformPhoneme(phoneme, newFeatures[0], features);
  // if deletion occurs
-  if (!newPhoneme.grapheme) return [ ...newLexeme] ;
+  if (!newPhoneme || !newPhoneme.grapheme) return [ ...newLexeme] ;
  return [...newLexeme, newPhoneme];
 }

@ -264,11 +269,14 @@ export const run = (state: stateType, action: resultsAction): stateType => {
      const { phones, features, lexicon } = state;
      let lexiconBundle;
      if ( epoch.parent ) {
-        lexiconBundle = results.find(result => result.pass === epoch.parent).lexicon
+        lexiconBundle = results.find(result => result.pass === epoch.parent)
      }
-      if (!epoch.parent) {
+      if (!lexiconBundle) {
        lexiconBundle = formBundleFromLexicon(lexicon)(phones); 
      }
+      else {
+        lexiconBundle = lexiconBundle.lexicon
+      }
      const ruleBundle = decomposeRules(epoch, phones);
      const passResults = transformLexicon(lexiconBundle)(ruleBundle)(features)
      const pass = { pass: epoch.name, lexicon: passResults }
@ -277,9 +285,9 @@ export const run = (state: stateType, action: resultsAction): stateType => {
    }, []);
    
    const results = passResults.map(stringifyResults);
-    return {...state, results, errors: {} }
+    return {...state, results, errors: {}, parseResults: '' }
  } catch (err) {
    console.log(err)
-    return {...state, errors: err, results:[] };
+    return {...state, errors: err, results:[], parseResults: '' };
  }
 }
--- a/src/reducers/reducer.results.test.js
+++ b/src/reducers/reducer.results.test.js
@ -22,43 +22,99 @@ describe('Results', () => {
  it('rule without ">" returns helpful error message', () => {
    const { phones } = initState();
    const epoch = { name: 'error epoch', changes: [ 't/n/_' ] }
-    expect(decomposeRules(epoch, phones)).toEqual("Error in line 1: Insert '>' operator between target and result");
+    const errorMessage = {epoch: 'error epoch', error: "Error in line 1: Insert '>' operator between target and result"};
+    let receivedError;
+    try {
+      decomposeRules(epoch, phones)
+    }
+    catch (err) {
+      receivedError=err;
+    }
+    expect(receivedError).toStrictEqual(errorMessage);
  })
-
+  
  it('rule with too many ">" returns helpful error message', () => {
    const { phones } = initState();
    const epoch = { name: 'error epoch', changes: [ 't>n>/_' ] }
-    expect(decomposeRules(epoch, phones)).toEqual("Error in line 1: Too many '>' operators");
+    const errorMessage = {epoch: 'error epoch', error: "Error in line 1: Too many '>' operators"};
+    let receivedError;
+    try {
+      decomposeRules(epoch, phones)
+    }
+    catch (err) {
+      receivedError=err;
+    }
+    expect(receivedError).toStrictEqual(errorMessage);
  })
-
+  
  it('rule without "/" returns helpful error message', () => {
    const { phones } = initState();
    const epoch = { name: 'error epoch', changes: [ 't>n_' ] }
-    expect(decomposeRules(epoch, phones)).toEqual("Error in line 1: Insert '/' operator between change and environment");
+    const errorMessage = {epoch: 'error epoch', error: "Error in line 1: Insert '/' operator between change and environment"};
+    let receivedError;
+    try {
+      decomposeRules(epoch, phones)
+    }
+    catch (err) {
+      receivedError=err;
+    }
+    expect(receivedError).toStrictEqual(errorMessage);
  })
-
+  
  it('rule with too many "/" returns helpful error message', () => {
    const { phones } = initState();
    const epoch = { name: 'error epoch', changes: [ 't>n/_/' ] }
-    expect(decomposeRules(epoch, phones)).toEqual("Error in line 1: Too many '/' operators");
+    const errorMessage = {epoch: 'error epoch', error: "Error in line 1: Too many '/' operators"};
+    let receivedError;
+    try {
+      decomposeRules(epoch, phones)
+    }
+    catch (err) {
+      receivedError=err;
+    }
+    expect(receivedError).toStrictEqual(errorMessage);
  })
-
+  
  it('rule without "_" returns helpful error message', () => {
    const { phones } = initState();
    const epoch = { name: 'error epoch', changes: [ 't>n/' ] }
-    expect(decomposeRules(epoch, phones)).toEqual("Error in line 1: Insert '_' operator in environment");
+    const errorMessage = {epoch: 'error epoch', error: "Error in line 1: Insert '_' operator in environment"};
+    let receivedError;
+    try {
+      decomposeRules(epoch, phones)
+    }
+    catch (err) {
+      receivedError=err;
+    }
+    expect(receivedError).toStrictEqual(errorMessage);
  })
-
+  
  it('rule with too many "_" returns helpful error message', () => {
    const { phones } = initState();
    const epoch = { name: 'error epoch', changes: [ 't>n/__' ] }
-    expect(decomposeRules(epoch, phones)).toEqual("Error in line 1: Too many '_' operators");
+    const errorMessage = {epoch: 'error epoch', error: "Error in line 1: Too many '_' operators"};
+    let receivedError;
+    try {
+      decomposeRules(epoch, phones)
+    }
+    catch (err) {
+      receivedError=err;
+    }
+    expect(receivedError).toStrictEqual(errorMessage);
  })
-
+  
  it('rule with incorrect feature syntax returns helpful error message', () => {
    const { phones } = initState();
    const epoch = { name: 'error epoch', changes: [ '[+ occlusive - nasal = obstruent]>n/_' ] }
-    expect(decomposeRules(epoch, phones)).toEqual("Error in line 1: Unknown token '='");
+    const errorMessage = {epoch: 'error epoch', error: "Error in line 1: Unknown token '='"};
+    let receivedError;
+    try {
+      decomposeRules(epoch, phones)
+    }
+    catch (err) {
+      receivedError=err;
+    }
+    expect(receivedError).toStrictEqual(errorMessage);
  })

  it('expect transform lexeme to apply rule to lexeme', () => {
@ -74,7 +130,7 @@ describe('Results', () => {
    state = initState(1)
    expect(stateReducer(state, action).results).toEqual([
      {
-        pass: 'epoch 1',
+        pass: 'epoch-1',
        lexicon: [
          'anna', 'anat', 'anət', 'anna', 'tan', 'ənna'
        ]
@ -87,7 +143,7 @@ describe('Results', () => {
    state = initState(2)
    expect(stateReducer(state, action).results).toEqual([
      {
-        pass: 'epoch 1',
+        pass: 'epoch-1',
        lexicon: [
          'annɯ', 'anat', 'anət', 'annɯ', 'tan', 'ənnɯ'
        ]
@ -100,7 +156,7 @@ describe('Results', () => {
    state = initState(3)
    expect(stateReducer(state, action).results).toEqual([
      {
-        pass: 'epoch 1',
+        pass: 'epoch-1',
        lexicon: [
          'annɯ', 'anat', 'ant', 'annɯ', 'tan', 'nnɯ'
        ]
@ -113,7 +169,7 @@ describe('Results', () => {
    state = initState(4)
    expect(stateReducer(state, action).results).toEqual([
      {
-        pass: 'epoch 1',
+        pass: 'epoch-1',
        lexicon: [
          'annɯ', 'anat', 'ant', 'annɯ', 'tʰan', 'nnɯ'
        ]
@ -126,7 +182,7 @@ describe('Results', () => {
    state = initState(5)
    expect(stateReducer(state, action).results).toEqual([
      {
-        pass: 'epoch 1',
+        pass: 'epoch-1',
        lexicon: [
          'annu', 'anat', 'ant', 'annu', 'tʰan', 'nnu'
        ]
@ -139,7 +195,7 @@ describe('Results', () => {
  //   state = initState(6)
  //   expect(stateReducer(state, action).results).toEqual([
  //     {
-  //       pass: 'epoch 1',
+  //       pass: 'epoch-1',
  //       lexicon: [
  //         'annu', 'anta', 'ant', 'annu', 'tʰan', 'nnu'
  //       ]
@ -151,7 +207,7 @@ describe('Results', () => {
    const action = {type: 'RUN'};
    state = initState(5);
    const newEpoch = {
-      name: 'epoch 2',
+      name: 'epoch-2',
      changes: [
        '[+ sonorant ]>0/#_.',
        'n>0/#_n'
@ -160,13 +216,13 @@ describe('Results', () => {
    state.epochs = [ ...state.epochs, newEpoch ]
    expect(stateReducer(state, action).results).toEqual([
      {
-        pass: 'epoch 1',
+        pass: 'epoch-1',
        lexicon: [
          'annu', 'anat', 'ant', 'annu', 'tʰan', 'nnu'
        ]
      },
      {
-        pass: 'epoch 2',
+        pass: 'epoch-2',
        lexicon: [
          'nta', 'nat', 'nət', 'na', 'tan', 'nta'
        ]
@ -178,8 +234,8 @@ describe('Results', () => {
    const action = {type: 'RUN'};
    state = initState(5);
    const newEpoch = {
-      name: 'epoch 2',
-      parent: 'epoch 1',
+      name: 'epoch-2',
+      parent: 'epoch-1',
      changes: [
        '[+ sonorant ]>0/#_.'
      ]
@ -187,14 +243,14 @@ describe('Results', () => {
    state.epochs = [ ...state.epochs, newEpoch ]
    expect(stateReducer(state, action).results).toEqual([
      {
-        pass: 'epoch 1',
+        pass: 'epoch-1',
        lexicon: [
          'annu', 'anat', 'ant', 'annu', 'tʰan', 'nnu'
        ]
      },
      {
-        pass: 'epoch 2',
-        parent: 'epoch 1',
+        pass: 'epoch-2',
+        parent: 'epoch-1',
        lexicon: [
          'nnu', 'nat', 'nt', 'nnu', 'tʰan', 'nu'
        ]
--- a/src/utils/latl/README.md
+++ b/src/utils/latl/README.md
@ -0,0 +1,75 @@
+# LATL specification
+
+## Feature Definition
+
+## Rule Definition
+ex. 
+```
+(
+  `Unmotivated A to C`
+  A -> B / _
+  A -> C / _
+  ``A becomes C in all environments with a intermediate state of B``
+)
+```
+### Rule Body
+#### Sound Definition
+#### Change Definition
+#### Environment Definition
+##### Null Environment
+Valid syntaxes:
+```
+A -> B          ; no indicated environment
+A -> B / _      ; environment indicated wth underscore
+A -> B / . _ .  ; environment indicated with underscore and placeholder dots
+```
+### Rule Metadata
+#### Rule Title
+#### Rule Description
+
+## Language Primitives
+## Data Structures
+### Sets
+Sets are collections of pointers to phones. The GLOBAL set contains all phones, making all other sets subsets of GLOBAL.
+#### Global Set
+[ GLOBAL ] is a shorthand for [ GLOBAL.SETS ]
+#### Set Definition
+Sets are defined with the set keyword followed by an equal sign and a set expression:
+```
+set SHORT_VOWELS = [ a, i, u ]
+```
+
+A single alias can be provided to the set during definition:
+```
+; the alias N can be used to refer to this set
+set NASAL_PULMONIC_CONSONANTS, N            = [ m, ɱ, n̼, n, ɳ, ɲ, ŋ, ɴ ]
+```
+
+Lists of sets can be defined using a comma followed by whitespace syntax
+```
+set PLOSIVES = [ p, t, k ],
+    FRICATIVES = [ f, s, x ],
+    LABIALIZED_PLOSIVES = { PLOSIVES yield [ X concat ʷ ] }
+```
+#### Set Usage
+#### Set Operations
+##### 'and' Operation
+##### 'or' Operation
+##### 'not' Operation
+##### 'nor' Operation
+##### 'in' Operation
+##### 'yield' Operation
+### Lexemes
+#### Lexeme Operations
+### Phone
+For set of phones 'a', 'b', and 'ab':
+```
+GLOBAL ┬▻ <Key: a> ┬▻ <Key: b> ┬▻ { feature: <Boolean>, ... }
+       │           │           └▻ grapheme: <String: 'ab'>
+       │           └┬▻ { feature: <Boolean>, ... }
+       │            └▻ grapheme: <String: 'a'>
+       └┬▻ { feature: <Boolean>, ... }
+        └▻ grapheme: <String: 'b'>
+```
+#### Phone Operations
+### Epochs
--- a/src/utils/latl/codeGenerator.js
+++ b/src/utils/latl/codeGenerator.js
@ -0,0 +1,19 @@
+import { parser } from './parser';
+
+export const codeGenerator = (latl) => {
+  const results = parser().feed(latl).results;
+  
+  const nodeReader = (code, node) => {
+    if (node.length) {
+      return results.reduce(nodeReader, code)
+    }
+    if (!node) return code;
+    if (node.main) {
+      return nodeReader(code, node.main)
+    }
+    return code + node;
+  }
+
+  return nodeReader('', results)
+
+}
--- a/src/utils/latl/grammar.js
+++ b/src/utils/latl/grammar.js
@ -0,0 +1,120 @@
+// Generated automatically by nearley, version 2.19.1
+// http://github.com/Hardmath123/nearley
+(function () {
+function id(x) { return x[0]; }
+
+  const { lexer } = require('./lexer.js');
+  const getTerminal = d => d ? d[0] : null;
+  const getAll = d => d.map((item, i) => ({ [i]: item }));
+  const flag = token => d => d.map(item => ({ [token]: item }))
+  const clearNull = d => d.filter(t => !!t && (t.length !== 1 || t[0])).map(t => t.length ? clearNull(t) : t);
+  const flagIndex = d => d.map((item, i) => ({[i]: item}))
+  const remove = _ => null;
+  const append = d => d.join('');
+  const constructSet =  d => d.reduce((acc, t) => { 
+    if (t && t.type === 'setIdentifier') acc.push({set: t});
+    if (t && t.length) acc[acc.length - 1].phones = t;
+    return acc;
+  }, []);
+  const pipe = (...funcs) => d => funcs.reduce((acc, func) => func(acc), d);
+  const objFromArr = d => d.reduce((obj, item) => ({ ...obj, ...item }), {});
+var grammar = {
+    Lexer: lexer,
+    ParserRules: [
+    {"name": "main$ebnf$1", "symbols": []},
+    {"name": "main$ebnf$1$subexpression$1", "symbols": ["_", "statement"]},
+    {"name": "main$ebnf$1", "symbols": ["main$ebnf$1", "main$ebnf$1$subexpression$1"], "postprocess": function arrpush(d) {return d[0].concat([d[1]]);}},
+    {"name": "main", "symbols": ["main$ebnf$1", "_"], "postprocess":  pipe(
+          clearNull,
+          // recursive call to fix repeat?
+          d => d.map(t => t && t.length === 1 && t[0] ? t[0] : t),
+          d => d.map(t => t && t.length === 1 && t[0] ? t[0] : t),
+          flag('main'), 
+          getTerminal,
+        ) },
+    {"name": "_$ebnf$1$subexpression$1", "symbols": [(lexer.has("whiteSpace") ? {type: "whiteSpace"} : whiteSpace)]},
+    {"name": "_$ebnf$1", "symbols": ["_$ebnf$1$subexpression$1"], "postprocess": id},
+    {"name": "_$ebnf$1", "symbols": [], "postprocess": function(d) {return null;}},
+    {"name": "_", "symbols": ["_$ebnf$1"], "postprocess": remove},
+    {"name": "__", "symbols": [(lexer.has("whiteSpace") ? {type: "whiteSpace"} : whiteSpace)], "postprocess": remove},
+    {"name": "equal", "symbols": [(lexer.has("equal") ? {type: "equal"} : equal)], "postprocess": remove},
+    {"name": "statement", "symbols": ["comment"]},
+    {"name": "statement", "symbols": ["definition"], "postprocess":  pipe(
+          d => d.flatMap(u => u && u.length ? u.filter(t => t && t.type !== 'comma' && t.type !== 'kwSet') : u),
+          // recursive call to fit repeat?
+          d => d.map(t => t && t.length === 1 && t[0] ? t[0] : t),
+          d => d.map(t => t && t.length === 1 && t[0] ? t[0] : t),
+          // may split from other definition statements
+          d => d.map(t => t && t.length > 1 ? ({ type: 'set', ...objFromArr(t) }) :  null)
+        ) },
+    {"name": "comment", "symbols": [(lexer.has("comment") ? {type: "comment"} : comment)], "postprocess": pipe(getTerminal, remove)},
+    {"name": "definition$ebnf$1", "symbols": []},
+    {"name": "definition$ebnf$1$subexpression$1", "symbols": ["setDefinition", (lexer.has("comma") ? {type: "comma"} : comma), "__"]},
+    {"name": "definition$ebnf$1", "symbols": ["definition$ebnf$1", "definition$ebnf$1$subexpression$1"], "postprocess": function arrpush(d) {return d[0].concat([d[1]]);}},
+    {"name": "definition", "symbols": [(lexer.has("kwSet") ? {type: "kwSet"} : kwSet), "__", "definition$ebnf$1", "setDefinition"], "postprocess":  pipe(
+          // not yet sure why this call is required twice
+          d => d.map(u => u && u.length ? u.filter(t => t && t.type !== 'comma' && t.type !== 'kwSet') : u),
+          d => d.map(u => u && u.length ? u.filter(t => t && t.type !== 'comma' && t.type !== 'kwSet') : u),
+          d => d.map(u => u && u.length ? u.map(v => v.length ? v.filter(t => t && t.type !== 'comma' && t.type !== 'kwSet')[0] : v) : u),
+          clearNull,
+        ) },
+    {"name": "setDefinition$ebnf$1$subexpression$1", "symbols": ["setAlias"]},
+    {"name": "setDefinition$ebnf$1", "symbols": ["setDefinition$ebnf$1$subexpression$1"], "postprocess": id},
+    {"name": "setDefinition$ebnf$1", "symbols": [], "postprocess": function(d) {return null;}},
+    {"name": "setDefinition", "symbols": [(lexer.has("setIdentifier") ? {type: "setIdentifier"} : setIdentifier), "setDefinition$ebnf$1", "__", "equal", "__", "setExpression"], "postprocess":  
+        pipe(
+          d => d.filter(t => !!t && t.length !== 0),
+          d => d.map(u => u && u.length ? u.map(t => t && t.length ? t.filter(v => v && v.type !== 'comma') : t) : u),
+          d => d.map(t => t.type === 'setIdentifier' ? { setIdentifier: t.toString() } : t),
+          d => d.map(t => t && t.length && t[0].hasOwnProperty('setExpression') ? t[0] : t),
+          d => d.map(t => t.length ?
+            // pretty ugly ([ { type: 'aias', alias: [ string ] }] ) => { setAlias: str }
+            { setAlias: t.reduce((aliases, token) => token && token.type === 'alias' ? [...aliases, ...token.alias] : aliases, [])[0] }
+          : t),
+        )    
+                        },
+    {"name": "setExpression", "symbols": [(lexer.has("openSquareBracket") ? {type: "openSquareBracket"} : openSquareBracket), "_", "phoneList", "_", (lexer.has("closeSquareBracket") ? {type: "closeSquareBracket"} : closeSquareBracket)]},
+    {"name": "setExpression$ebnf$1$subexpression$1", "symbols": ["setOperation"]},
+    {"name": "setExpression$ebnf$1", "symbols": ["setExpression$ebnf$1$subexpression$1"], "postprocess": id},
+    {"name": "setExpression$ebnf$1", "symbols": [], "postprocess": function(d) {return null;}},
+    {"name": "setExpression", "symbols": [(lexer.has("openCurlyBracket") ? {type: "openCurlyBracket"} : openCurlyBracket), "_", "setExpression$ebnf$1", "_", (lexer.has("closeCurlyBracket") ? {type: "closeCurlyBracket"} : closeCurlyBracket)], "postprocess":  
+        pipe(
+          // filters commas and whitespace
+          d => d.filter(t => t && t.length),
+          d => d.map(t => t.map(u => u[0])),
+          flag('setExpression') 
+        ) },
+    {"name": "setAlias", "symbols": [(lexer.has("comma") ? {type: "comma"} : comma), "_", (lexer.has("setIdentifier") ? {type: "setIdentifier"} : setIdentifier)], "postprocess":  pipe(
+          d => d && d.length ? d.filter(t => !!t) : d,
+          d => d.map(t => t.type === 'setIdentifier' ? t.toString() : null),
+          d => d.filter(t => !!t),
+          d => ({type: 'alias', alias: d }),
+        ) },
+    {"name": "phoneList$ebnf$1", "symbols": []},
+    {"name": "phoneList$ebnf$1$subexpression$1$ebnf$1", "symbols": []},
+    {"name": "phoneList$ebnf$1$subexpression$1$ebnf$1$subexpression$1", "symbols": [(lexer.has("comma") ? {type: "comma"} : comma), "_"]},
+    {"name": "phoneList$ebnf$1$subexpression$1$ebnf$1", "symbols": ["phoneList$ebnf$1$subexpression$1$ebnf$1", "phoneList$ebnf$1$subexpression$1$ebnf$1$subexpression$1"], "postprocess": function arrpush(d) {return d[0].concat([d[1]]);}},
+    {"name": "phoneList$ebnf$1$subexpression$1", "symbols": [(lexer.has("phone") ? {type: "phone"} : phone), "phoneList$ebnf$1$subexpression$1$ebnf$1"]},
+    {"name": "phoneList$ebnf$1", "symbols": ["phoneList$ebnf$1", "phoneList$ebnf$1$subexpression$1"], "postprocess": function arrpush(d) {return d[0].concat([d[1]]);}},
+    {"name": "phoneList", "symbols": ["phoneList$ebnf$1"], "postprocess":  
+        pipe(
+          d => d ? d[0].map(t => t.filter(u => u.type === 'phone').map(u => u.toString())) : d
+        )
+                        },
+    {"name": "setOperation", "symbols": ["orOperation"]},
+    {"name": "setOperation", "symbols": [(lexer.has("identifier") ? {type: "identifier"} : identifier)], "postprocess":  pipe(
+          d => d.type ? d : ({ identifier: d.toString(), type: 'identifier' })
+        )},
+    {"name": "orOperation", "symbols": ["_", "setOperation", "__", (lexer.has("kwSetOr") ? {type: "kwSetOr"} : kwSetOr), "__", "setOperation", "_"], "postprocess":  pipe(
+          d => d.filter(d => !!d),
+          d => ({ type: 'operator', operator: 'or', operands: [ d[0], d[2] ] }),
+        ) }
+]
+  , ParserStart: "main"
+}
+if (typeof module !== 'undefined'&& typeof module.exports !== 'undefined') {
+   module.exports = grammar;
+} else {
+   window.grammar = grammar;
+}
+})();
--- a/src/utils/latl/grammar.ne
+++ b/src/utils/latl/grammar.ne
@ -0,0 +1,109 @@
+@{%
+  const { lexer } = require('./lexer.js');
+  const getTerminal = d => d ? d[0] : null;
+  const getAll = d => d.map((item, i) => ({ [i]: item }));
+  const flag = token => d => d.map(item => ({ [token]: item }))
+  const clearNull = d => d.filter(t => !!t && (t.length !== 1 || t[0])).map(t => t.length ? clearNull(t) : t);
+  const flagIndex = d => d.map((item, i) => ({[i]: item}))
+  const remove = _ => null;
+  const append = d => d.join('');
+  const constructSet =  d => d.reduce((acc, t) => { 
+    if (t && t.type === 'setIdentifier') acc.push({set: t});
+    if (t && t.length) acc[acc.length - 1].phones = t;
+    return acc;
+  }, []);
+  const pipe = (...funcs) => d => funcs.reduce((acc, func) => func(acc), d);
+  const objFromArr = d => d.reduce((obj, item) => ({ ...obj, ...item }), {});
+%}
+
+@lexer lexer
+
+main            -> (_ statement):* _
+  {% pipe(
+    clearNull,
+    // recursive call to fix repeat?
+    d => d.map(t => t && t.length === 1 && t[0] ? t[0] : t),
+    d => d.map(t => t && t.length === 1 && t[0] ? t[0] : t),
+    flag('main'), 
+    getTerminal,
+  ) %}
+
+_               -> (%whiteSpace):? 
+  {% remove %}
+
+__              -> %whiteSpace 
+  {% remove %}
+
+equal           -> %equal
+  {% remove %}
+
+statement       -> comment | definition
+  {% pipe(
+    d => d.flatMap(u => u && u.length ? u.filter(t => t && t.type !== 'comma' && t.type !== 'kwSet') : u),
+    // recursive call to fit repeat?
+    d => d.map(t => t && t.length === 1 && t[0] ? t[0] : t),
+    d => d.map(t => t && t.length === 1 && t[0] ? t[0] : t),
+    // may split from other definition statements
+    d => d.map(t => t && t.length > 1 ? ({ type: 'set', ...objFromArr(t) }) :  null)
+  ) %}
+
+comment         -> %comment 
+  {% pipe(getTerminal, remove) %}
+
+# SETS
+definition      -> %kwSet __ (setDefinition %comma __):* setDefinition
+                {% pipe(
+                  // not yet sure why this call is required twice
+                  d => d.map(u => u && u.length ? u.filter(t => t && t.type !== 'comma' && t.type !== 'kwSet') : u),
+                  d => d.map(u => u && u.length ? u.filter(t => t && t.type !== 'comma' && t.type !== 'kwSet') : u),
+                  d => d.map(u => u && u.length ? u.map(v => v.length ? v.filter(t => t && t.type !== 'comma' && t.type !== 'kwSet')[0] : v) : u),
+                  clearNull,
+                ) %}
+setDefinition   -> %setIdentifier (setAlias):? __ equal __ setExpression
+                {% 
+                  pipe(
+                    d => d.filter(t => !!t && t.length !== 0),
+                    d => d.map(u => u && u.length ? u.map(t => t && t.length ? t.filter(v => v && v.type !== 'comma') : t) : u),
+                    d => d.map(t => t.type === 'setIdentifier' ? { setIdentifier: t.toString() } : t),
+                    d => d.map(t => t && t.length && t[0].hasOwnProperty('setExpression') ? t[0] : t),
+                    d => d.map(t => t.length ?
+                      // pretty ugly ([ { type: 'aias', alias: [ string ] }] ) => { setAlias: str }
+                      { setAlias: t.reduce((aliases, token) => token && token.type === 'alias' ? [...aliases, ...token.alias] : aliases, [])[0] }
+                    : t),
+                  )    
+                %}
+setExpression   -> %openSquareBracket _ phoneList _ %closeSquareBracket
+                | %openCurlyBracket _ (setOperation):? _ %closeCurlyBracket
+                {% 
+                  pipe(
+                    // filters commas and whitespace
+                    d => d.filter(t => t && t.length),
+                    d => d.map(t => t.map(u => u[0])),
+                    flag('setExpression') 
+                  ) %}
+
+setAlias        -> %comma _ %setIdentifier
+                {% pipe(
+                  d => d && d.length ? d.filter(t => !!t) : d,
+                  d => d.map(t => t.type === 'setIdentifier' ? t.toString() : null),
+                  d => d.filter(t => !!t),
+                  d => ({type: 'alias', alias: d }),
+                ) %}
+
+phoneList       -> (%phone (%comma _):* ):*
+                {% 
+                  pipe(
+                    d => d ? d[0].map(t => t.filter(u => u.type === 'phone').map(u => u.toString())) : d
+                  )
+                %}
+setOperation    -> orOperation 
+                |  %identifier
+                {% pipe(
+                  d => d.type ? d : ({ identifier: d.toString(), type: 'identifier' })
+                )%}
+
+orOperation     -> _ setOperation __ %kwSetOr __ setOperation _
+                {% pipe(
+                  d => d.filter(d => !!d),
+                  d => ({ type: 'operator', operator: 'or', operands: [ d[0], d[2] ] }),
+                ) %}
--- a/src/utils/latl/lexer.js
+++ b/src/utils/latl/lexer.js
@ -0,0 +1,124 @@
+const moo = require("moo");
+
+const lexer = moo.states({
+  main: {
+    comment: /;.*$/,
+    star: { match: /\*/, push: "epoch" },
+    slash: { match: /\//, push: "lexicon" },
+    // change so that identifiers are always upper, keywords are always lower, phones are always lower
+    kwSet: {
+      match: "set",
+      type: moo.keywords({ kwSet: "set " }),
+      push: "setDefinition",
+    },
+    identifier: { match: /[A-Za-z]+[\u00c0-\u03FFA-Za-z0-9\\-\\_]*/ },
+    openBracket: { match: /\[/, push: "feature" },
+    whiteSpace: { match: /\s+/, lineBreaks: true },
+    newLine: { match: /\n+/, lineBreaks: true },
+  },
+
+  epoch: {
+    identifier: {
+      match: /[A-Za-z]+[\u00c0-\u03FFA-Za-z0-9\\-\\_]*/,
+      push: "rule",
+    },
+    openParen: { match: /\(/, push: "ruleDefinition" },
+    pipe: { match: /\|/, pop: true },
+    greaterThan: /\>/,
+    arrow: /\-\>/,
+    hash: /#/,
+    slash: /\//,
+    dot: /\./,
+    underscore: /\_/,
+    newLine: { match: /\n/, lineBreaks: true },
+  },
+
+  ruleDefinition: {
+    doubleTick: { match: /``/, push: "ruleName" },
+    singleTick: { match: /`/, push: "ruleDescription" },
+    // push rule
+    closeParen: { match: /\)/, pop: true },
+    newLine: { match: /\n/, lineBreaks: true },
+  },
+
+  ruleName: {
+    ruleName: { match: /.+(?=``)/ },
+    doubleTick: { match: /``/, pop: true },
+  },
+
+  ruleDescription: {
+    ruleDescription: { match: /.+(?=`)/ },
+    singleTick: { match: /`/, pop: true },
+  },
+
+  rule: {
+    openSquareBracket: { match: /\[/, push: "ruleFeature" },
+    // whiteSpace:           { match: /\s/ },
+    newLine: { match: /\n/, pop: true, lineBreaks: true },
+  },
+
+  ruleFeature: {
+    ruleFeature: { match: /[A-Za-z]+[\u00c0-\u03FFA-Za-z0-9\\-\\_]*/ },
+    closeBracket: { match: /\]/, pop: true },
+    newLine: { match: /\n/, lineBreaks: true },
+  },
+
+  lexicon: {
+    slash: { match: /\//, pop: true },
+    newLine: { match: /\n/, lineBreaks: true },
+  },
+
+  feature: {
+    closeBracket: { match: /\]/, pop: true },
+    positiveAssignment: /\+=/,
+    negativeAssignment: /\-=/,
+    newLine: { match: /\n/, lineBreaks: true },
+  },
+
+  setDefinition: {
+    comment: /;.*$/,
+    setIdentifier: { match: /[A-Z]+[A-Z_]*/ },
+    openCurlyBracket: { match: /\{/, push: "setOperation" },
+    equal: /=/,
+    openSquareBracket: /\[/,
+    phone: /[\u00c0-\u03FFa-z]+/,
+    closeSquareBracket: { match: /\]/ },
+    comma: { match: /,/, push: "commaOperation" },
+    whiteSpace: { match: /[\t ]+/ },
+    newLine: { match: /\n/, pop: true, lineBreaks: true },
+  },
+
+  setOperation: {
+    closeCurlyBracket: { match: /\}/, pop: true },
+    // ! restrict identifiers
+    keyword: {
+      match: ["not", "and", "or", "nor", "in", "yield", "concat", "dissoc"],
+      type: moo.keywords({
+        kwSetNot: "not",
+        kwSetAnd: "and",
+        kwSetOr: "or",
+        kwSetNor: "nor",
+        kwSetIn: "in",
+        kwSetYield: "yield",
+        kwSetConcat: "concat",
+        kwSetDissoc: "dissoc",
+      }),
+    },
+    identifier: /[A-Z]+[A-Z_]+/,
+    whiteSpace: { match: /\s+/, lineBreaks: true },
+    openSquareBracket: /\[/,
+    closeSquareBracket: /\]/,
+    identifier: /[A-Z]+[A-Z_]*/,
+    phone: /[\u00c0-\u03FFa-z]+/,
+  },
+
+  commaOperation: {
+    // if comma is detected during a definition, the commaOperation consumes all white space and pops back to definition
+    // this prevents popping back to main
+    comment: /\s*;.*$/,
+    whiteSpace: { match: /\s+/, lineBreaks: true, pop: true },
+    newLine: { match: /\n/, lineBreaks: true, pop: true },
+  },
+});
+
+module.exports = { lexer };
--- a/src/utils/latl/parser.js
+++ b/src/utils/latl/parser.js
@ -0,0 +1,4 @@
+const nearley = require("nearley");
+const grammar = require("./grammar.js");
+
+export const parser = () => new nearley.Parser(nearley.Grammar.fromCompiled(grammar));
--- a/src/utils/latl/test/assertionData.js
+++ b/src/utils/latl/test/assertionData.js
@ -0,0 +1,810 @@
+export const assertionData = {
+  simpleComment: {
+    latl: `; comment`,
+    tokens: [{ type: "comment", value: "; comment" }],
+    AST: {
+      main: [],
+    },
+    code: "",
+  },
+  simpleSetDefinition: {
+    latl: `set NASAL_PULMONIC_CONSONANTS = [ m̥, m, ɱ ]`,
+    tokens: [
+      { type: "kwSet", value: "set" },
+      { type: "whiteSpace", value: " " },
+      { type: "setIdentifier", value: "NASAL_PULMONIC_CONSONANTS" },
+      { type: "whiteSpace", value: " " },
+      { type: "equal", value: "=" },
+      { type: "whiteSpace", value: " " },
+      { type: "openSquareBracket", value: "[" },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "m̥" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "m" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "ɱ" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeSquareBracket", value: "]" },
+    ],
+    AST: {
+      main: [
+        {
+          type: "set",
+          setIdentifier: "NASAL_PULMONIC_CONSONANTS",
+          setExpression: ["m̥", "m", "ɱ"],
+        },
+      ],
+    },
+    code: "",
+  },
+  commaSetDefinition: {
+    latl: `
+set NASAL_PULMONIC_CONSONANTS               = [ m̥, m, ɱ, n̼, n̥, n, ɳ̊, ɳ, ɲ̊, ɲ, ŋ, ̊ŋ, ɴ ],
+    STOP_PULMONIC_CONSONANTS                = [ p, b, p̪, b̪, t̼, d̼, t, d, ʈ, ɖ, c, ɟ, k, ɡ, q, ɢ, ʡ, ʔ ]`,
+    tokens: [
+      { type: "whiteSpace", value: "\n" },
+      { type: "kwSet", value: "set" },
+      { type: "whiteSpace", value: " " },
+      { type: "setIdentifier", value: "NASAL_PULMONIC_CONSONANTS" },
+      { type: "whiteSpace", value: "               " },
+      { type: "equal", value: "=" },
+      { type: "whiteSpace", value: " " },
+      { type: "openSquareBracket", value: "[" },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "m̥" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "m" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "ɱ" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "n̼" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "n̥" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "n" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "ɳ̊" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "ɳ" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "ɲ̊" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "ɲ" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "ŋ" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "̊ŋ" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "ɴ" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeSquareBracket", value: "]" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: "\n    " },
+      { type: "setIdentifier", value: "STOP_PULMONIC_CONSONANTS" },
+      { type: "whiteSpace", value: "                " },
+      { type: "equal", value: "=" },
+      { type: "whiteSpace", value: " " },
+      { type: "openSquareBracket", value: "[" },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "p" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "b" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "p̪" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "b̪" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "t̼" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "d̼" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "t" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "d" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "ʈ" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "ɖ" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "c" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "ɟ" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "k" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "ɡ" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "q" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "ɢ" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "ʡ" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "ʔ" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeSquareBracket", value: "]" },
+    ],
+    AST: {
+      main: [
+        {
+          type: "set",
+          setIdentifier: "NASAL_PULMONIC_CONSONANTS",
+          setExpression: [
+            "m̥",
+            "m",
+            "ɱ",
+            "n̼",
+            "n̥",
+            "n",
+            "ɳ̊",
+            "ɳ",
+            "ɲ̊",
+            "ɲ",
+            "ŋ",
+            "̊ŋ",
+            "ɴ",
+          ],
+        },
+        {
+          type: "set",
+          setIdentifier: "STOP_PULMONIC_CONSONANTS",
+          setExpression: [
+            "p",
+            "b",
+            "p̪",
+            "b̪",
+            "t̼",
+            "d̼",
+            "t",
+            "d",
+            "ʈ",
+            "ɖ",
+            "c",
+            "ɟ",
+            "k",
+            "ɡ",
+            "q",
+            "ɢ",
+            "ʡ",
+            "ʔ",
+          ],
+        },
+      ],
+    },
+  },
+  setAliasDefinition: {
+    latl: `
+set NASAL_PULMONIC_CONSONANTS, N            = [ m̥, m, ɱ, n̼, n̥, n, ɳ̊, ɳ, ɲ̊, ɲ, ŋ, ̊ŋ, ɴ ]`,
+    tokens: [
+      { type: "whiteSpace", value: "\n" },
+      { type: "kwSet", value: "set" },
+      { type: "whiteSpace", value: " " },
+      { type: "setIdentifier", value: "NASAL_PULMONIC_CONSONANTS" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "setIdentifier", value: "N" },
+      { type: "whiteSpace", value: "            " },
+      { type: "equal", value: "=" },
+      { type: "whiteSpace", value: " " },
+      { type: "openSquareBracket", value: "[" },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "m̥" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "m" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "ɱ" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "n̼" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "n̥" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "n" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "ɳ̊" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "ɳ" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "ɲ̊" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "ɲ" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "ŋ" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "̊ŋ" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "ɴ" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeSquareBracket", value: "]" },
+    ],
+    AST: {
+      main: [
+        {
+          type: "set",
+          setIdentifier: "NASAL_PULMONIC_CONSONANTS",
+          setAlias: "N",
+          setExpression: [
+            "m̥",
+            "m",
+            "ɱ",
+            "n̼",
+            "n̥",
+            "n",
+            "ɳ̊",
+            "ɳ",
+            "ɲ̊",
+            "ɲ",
+            "ŋ",
+            "̊ŋ",
+            "ɴ",
+          ],
+        },
+      ],
+    },
+  },
+  setDefinitionJoin: {
+    latl: `
+set CLICK_CONSONANTS  = { TENUIS_CLICK_CONSONANTS or VOICED_CLICK_CONSONANTS }`,
+    tokens: [
+      { type: "whiteSpace", value: "\n" },
+      { type: "kwSet", value: "set" },
+      { type: "whiteSpace", value: " " },
+      { type: "setIdentifier", value: "CLICK_CONSONANTS" },
+      { type: "whiteSpace", value: "  " },
+      { type: "equal", value: "=" },
+      { type: "whiteSpace", value: " " },
+      { type: "openCurlyBracket", value: "{" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "TENUIS_CLICK_CONSONANTS" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetOr", value: "or" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "VOICED_CLICK_CONSONANTS" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeCurlyBracket", value: "}" },
+    ],
+    AST: {
+      main: [
+        {
+          type: "set",
+          setIdentifier: "CLICK_CONSONANTS",
+          setExpression: [
+            {
+              type: "operator",
+              operator: "or",
+              operands: [
+                {
+                  type: "identifier",
+                  identifier: "TENUIS_CLICK_CONSONANTS",
+                },
+                {
+                  type: "identifier",
+                  identifier: "VOICED_CLICK_CONSONANTS",
+                },
+              ],
+            },
+          ],
+        },
+      ],
+    },
+  },
+  setDefinitionMultiJoin: {
+    latl: `
+set CLICK_CONSONANTS  = { TENUIS_CLICK_CONSONANTS or VOICED_CLICK_CONSONANTS
+                          or NASAL_CLICK_CONSONANTS or L_CLICK_CONSONANTS 
+                        }`,
+    tokens: [
+      { type: "whiteSpace", value: "\n" },
+      { type: "kwSet", value: "set" },
+      { type: "whiteSpace", value: " " },
+      { type: "setIdentifier", value: "CLICK_CONSONANTS" },
+      { type: "whiteSpace", value: "  " },
+      { type: "equal", value: "=" },
+      { type: "whiteSpace", value: " " },
+      { type: "openCurlyBracket", value: "{" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "TENUIS_CLICK_CONSONANTS" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetOr", value: "or" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "VOICED_CLICK_CONSONANTS" },
+      { type: "whiteSpace", value: "\n                          " },
+      { type: "kwSetOr", value: "or" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "NASAL_CLICK_CONSONANTS" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetOr", value: "or" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "L_CLICK_CONSONANTS" },
+      { type: "whiteSpace", value: " \n                        " },
+      { type: "closeCurlyBracket", value: "}" },
+    ],
+    AST: {
+      main: [
+        {
+          type: "set",
+          setIdentifier: "CLICK_CONSONANTS",
+          setExpression: [
+            {
+              type: "operator",
+              operator: "or ",
+              operands: [
+                {
+                  type: "identifier",
+                  identifier: "TENUIS_CLICK_CONSONANTS",
+                },
+                {
+                  type: "operator",
+                  operator: "or",
+                  operands: [
+                    {
+                      type: "identifier",
+                      identifier: "VOICED_CLICK_CONSONANTS",
+                    },
+                    {
+                      type: "operator",
+                      operator: "or",
+                      operands: [
+                        {
+                          type: "identifier",
+                          identifier: "NASAL_CLICK_CONSONANTS",
+                        },
+                        {
+                          type: "identifier",
+                          operands: "L_CLICK_CONSONANTS",
+                        },
+                      ],
+                    },
+                  ],
+                },
+              ],
+            },
+          ],
+        },
+      ],
+    },
+  },
+  setDefinitionYield: {
+    latl: `
+set NASAL_VOWELS                      = { [ V ] in ORAL_VOWELS yield [ Ṽ ] },
+    SHORT_NASAL_VOWELS                = { [ Vː ] in NASAL_VOWELS yield [ V ]ː },
+    LONG_NASAL_VOWELS                 = { [ Vː ] in NASAL_VOWELS }`,
+    tokens: [
+      { type: "whiteSpace", value: "\n" },
+      { type: "kwSet", value: "set" },
+      { type: "whiteSpace", value: " " },
+      { type: "setIdentifier", value: "NASAL_VOWELS" },
+      { type: "whiteSpace", value: "                      " },
+      { type: "equal", value: "=" },
+      { type: "whiteSpace", value: " " },
+      { type: "openCurlyBracket", value: "{" },
+      { type: "whiteSpace", value: " " },
+      { type: "openSquareBracket", value: "[" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "V" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeSquareBracket", value: "]" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetIn", value: "in" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "ORAL_VOWELS" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetYield", value: "yield" },
+      { type: "whiteSpace", value: " " },
+      { type: "openSquareBracket", value: "[" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "V" },
+      { type: "phone", value: "̃" }, // test display for COMBINING TILDE OVERLAY is deceiving
+      { type: "whiteSpace", value: " " },
+      { type: "closeSquareBracket", value: "]" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeCurlyBracket", value: "}" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: "\n    " },
+      { type: "setIdentifier", value: "SHORT_NASAL_VOWELS" },
+      { type: "whiteSpace", value: "                " },
+      { type: "equal", value: "=" },
+      { type: "whiteSpace", value: " " },
+      { type: "openCurlyBracket", value: "{" },
+      { type: "whiteSpace", value: " " },
+      { type: "openSquareBracket", value: "[" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "V" },
+      { type: "phone", value: "ː" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeSquareBracket", value: "]" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetIn", value: "in" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "NASAL_VOWELS" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetYield", value: "yield" },
+      { type: "whiteSpace", value: " " },
+      { type: "openSquareBracket", value: "[" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "V" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeSquareBracket", value: "]" },
+      { type: "phone", value: "ː" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeCurlyBracket", value: "}" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: "\n    " },
+      { type: "setIdentifier", value: "LONG_NASAL_VOWELS" },
+      { type: "whiteSpace", value: "                 " },
+      { type: "equal", value: "=" },
+      { type: "whiteSpace", value: " " },
+      { type: "openCurlyBracket", value: "{" },
+      { type: "whiteSpace", value: " " },
+      { type: "openSquareBracket", value: "[" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "V" },
+      { type: "phone", value: "ː" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeSquareBracket", value: "]" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetIn", value: "in" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "NASAL_VOWELS" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeCurlyBracket", value: "}" },
+    ],
+  },
+
+  setOperationsJoin: {
+    latl: `
+; ---- set join operations non-mutable! 
+set SET_C = { SET_A not SET_B }, ;  left anti join
+    SET_D = { SET_A and SET_B }, ;  inner join
+    SET_E = { SET_A or SET_B },  ;  full outer join
+    SET_F = { not SET_A },           ;  = { GLOBAL not SET_A }
+    SET_G = { not SET_A nor SET_B } ;  = { GLOBAL not { SET_A or SET_B } }`,
+    tokens: [
+      { type: "whiteSpace", value: "\n" },
+      { type: "comment", value: "; ---- set join operations non-mutable! " },
+      { type: "whiteSpace", value: "\n" },
+      { type: "kwSet", value: "set" },
+      { type: "whiteSpace", value: " " },
+      { type: "setIdentifier", value: "SET_C" },
+      { type: "whiteSpace", value: " " },
+      { type: "equal", value: "=" },
+      { type: "whiteSpace", value: " " },
+      { type: "openCurlyBracket", value: "{" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "SET_A" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetNot", value: "not" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "SET_B" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeCurlyBracket", value: "}" },
+      { type: "comma", value: "," },
+      { type: "comment", value: " ;  left anti join" },
+      { type: "whiteSpace", value: "\n    " },
+      { type: "setIdentifier", value: "SET_D" },
+      { type: "whiteSpace", value: " " },
+      { type: "equal", value: "=" },
+      { type: "whiteSpace", value: " " },
+      { type: "openCurlyBracket", value: "{" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "SET_A" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetAnd", value: "and" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "SET_B" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeCurlyBracket", value: "}" },
+      { type: "comma", value: "," },
+      { type: "comment", value: " ;  inner join" },
+      { type: "whiteSpace", value: "\n    " },
+      { type: "setIdentifier", value: "SET_E" },
+      { type: "whiteSpace", value: " " },
+      { type: "equal", value: "=" },
+      { type: "whiteSpace", value: " " },
+      { type: "openCurlyBracket", value: "{" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "SET_A" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetOr", value: "or" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "SET_B" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeCurlyBracket", value: "}" },
+      { type: "comma", value: "," },
+      { type: "comment", value: "  ;  full outer join" },
+      { type: "whiteSpace", value: "\n    " },
+      { type: "setIdentifier", value: "SET_F" },
+      { type: "whiteSpace", value: " " },
+      { type: "equal", value: "=" },
+      { type: "whiteSpace", value: " " },
+      { type: "openCurlyBracket", value: "{" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetNot", value: "not" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "SET_A" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeCurlyBracket", value: "}" },
+      { type: "comma", value: "," },
+      { type: "comment", value: "           ;  = { GLOBAL not SET_A }" },
+      { type: "whiteSpace", value: "\n    " },
+      { type: "setIdentifier", value: "SET_G" },
+      { type: "whiteSpace", value: " " },
+      { type: "equal", value: "=" },
+      { type: "whiteSpace", value: " " },
+      { type: "openCurlyBracket", value: "{" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetNot", value: "not" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "SET_A" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetNor", value: "nor" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "SET_B" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeCurlyBracket", value: "}" },
+      { type: "whiteSpace", value: " " },
+      { type: "comment", value: ";  = { GLOBAL not { SET_A or SET_B } }" },
+    ],
+  },
+
+  setOperations: {
+    latl: `
+; ---- set character operations - non-mutable!
+set SET_B = { [ Xy ] in SET_A },    ; FILTER:       where X is any character and y is a filtering character
+    SET_C = { SET_A yield [ Xy ] }, ; CONCATENATE:  performs transformation with (prepended or) appended character
+    SET_D = { SET_A yield [ X concat y ] },
+    SET_E = { SET_A yield [ y concat X ] },
+    SET_F = { SET_A yield y[ X ] }, ; DISSOCIATE:   performs transformation removing prepended (or appended) character
+    SET_G = { SET_A yield y dissoc [ X ] },
+    SET_H = { SET_A yield [ X ] dissoc y },
+    SET_I = { [ Xy ] in SET_A yield [ X ]y } ; combined FILTER and DISSOCIATE`,
+    tokens: [
+      { type: "whiteSpace", value: "\n" },
+      {
+        type: "comment",
+        value: "; ---- set character operations - non-mutable!",
+      },
+      { type: "whiteSpace", value: "\n" },
+      { type: "kwSet", value: "set" },
+      { type: "whiteSpace", value: " " },
+      { type: "setIdentifier", value: "SET_B" },
+      { type: "whiteSpace", value: " " },
+      { type: "equal", value: "=" },
+      { type: "whiteSpace", value: " " },
+      { type: "openCurlyBracket", value: "{" },
+      { type: "whiteSpace", value: " " },
+      { type: "openSquareBracket", value: "[" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "X" },
+      { type: "phone", value: "y" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeSquareBracket", value: "]" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetIn", value: "in" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "SET_A" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeCurlyBracket", value: "}" },
+      { type: "comma", value: "," },
+      {
+        type: "comment",
+        value:
+          "    ; FILTER:       where X is any character and y is a filtering character",
+      },
+      { type: "whiteSpace", value: "\n    " },
+      { type: "setIdentifier", value: "SET_C" },
+      { type: "whiteSpace", value: " " },
+      { type: "equal", value: "=" },
+      { type: "whiteSpace", value: " " },
+      { type: "openCurlyBracket", value: "{" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "SET_A" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetYield", value: "yield" },
+      { type: "whiteSpace", value: " " },
+      { type: "openSquareBracket", value: "[" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "X" },
+      { type: "phone", value: "y" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeSquareBracket", value: "]" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeCurlyBracket", value: "}" },
+      { type: "comma", value: "," },
+      {
+        type: "comment",
+        value:
+          " ; CONCATENATE:  performs transformation with (prepended or) appended character",
+      },
+      { type: "whiteSpace", value: "\n    " },
+      { type: "setIdentifier", value: "SET_D" },
+      { type: "whiteSpace", value: " " },
+      { type: "equal", value: "=" },
+      { type: "whiteSpace", value: " " },
+      { type: "openCurlyBracket", value: "{" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "SET_A" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetYield", value: "yield" },
+      { type: "whiteSpace", value: " " },
+      { type: "openSquareBracket", value: "[" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "X" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetConcat", value: "concat" },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "y" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeSquareBracket", value: "]" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeCurlyBracket", value: "}" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: "\n    " },
+      { type: "setIdentifier", value: "SET_E" },
+      { type: "whiteSpace", value: " " },
+      { type: "equal", value: "=" },
+      { type: "whiteSpace", value: " " },
+      { type: "openCurlyBracket", value: "{" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "SET_A" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetYield", value: "yield" },
+      { type: "whiteSpace", value: " " },
+      { type: "openSquareBracket", value: "[" },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "y" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetConcat", value: "concat" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "X" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeSquareBracket", value: "]" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeCurlyBracket", value: "}" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: "\n    " },
+      { type: "setIdentifier", value: "SET_F" },
+      { type: "whiteSpace", value: " " },
+      { type: "equal", value: "=" },
+      { type: "whiteSpace", value: " " },
+      { type: "openCurlyBracket", value: "{" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "SET_A" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetYield", value: "yield" },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "y" },
+      { type: "openSquareBracket", value: "[" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "X" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeSquareBracket", value: "]" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeCurlyBracket", value: "}" },
+      { type: "comma", value: "," },
+      {
+        type: "comment",
+        value:
+          " ; DISSOCIATE:   performs transformation removing prepended (or appended) character",
+      },
+      { type: "whiteSpace", value: "\n    " },
+      { type: "setIdentifier", value: "SET_G" },
+      { type: "whiteSpace", value: " " },
+      { type: "equal", value: "=" },
+      { type: "whiteSpace", value: " " },
+      { type: "openCurlyBracket", value: "{" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "SET_A" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetYield", value: "yield" },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "y" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetDissoc", value: "dissoc" },
+      { type: "whiteSpace", value: " " },
+      { type: "openSquareBracket", value: "[" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "X" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeSquareBracket", value: "]" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeCurlyBracket", value: "}" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: "\n    " },
+      { type: "setIdentifier", value: "SET_H" },
+      { type: "whiteSpace", value: " " },
+      { type: "equal", value: "=" },
+      { type: "whiteSpace", value: " " },
+      { type: "openCurlyBracket", value: "{" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "SET_A" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetYield", value: "yield" },
+      { type: "whiteSpace", value: " " },
+      { type: "openSquareBracket", value: "[" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "X" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeSquareBracket", value: "]" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetDissoc", value: "dissoc" },
+      { type: "whiteSpace", value: " " },
+      { type: "phone", value: "y" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeCurlyBracket", value: "}" },
+      { type: "comma", value: "," },
+      { type: "whiteSpace", value: "\n    " },
+      { type: "setIdentifier", value: "SET_I" },
+      { type: "whiteSpace", value: " " },
+      { type: "equal", value: "=" },
+      { type: "whiteSpace", value: " " },
+      { type: "openCurlyBracket", value: "{" },
+      { type: "whiteSpace", value: " " },
+      { type: "openSquareBracket", value: "[" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "X" },
+      { type: "phone", value: "y" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeSquareBracket", value: "]" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetIn", value: "in" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "SET_A" },
+      { type: "whiteSpace", value: " " },
+      { type: "kwSetYield", value: "yield" },
+      { type: "whiteSpace", value: " " },
+      { type: "openSquareBracket", value: "[" },
+      { type: "whiteSpace", value: " " },
+      { type: "identifier", value: "X" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeSquareBracket", value: "]" },
+      { type: "phone", value: "y" },
+      { type: "whiteSpace", value: " " },
+      { type: "closeCurlyBracket", value: "}" },
+      { type: "whiteSpace", value: " " },
+      { type: "comment", value: "; combined FILTER and DISSOCIATE" },
+    ],
+  },
+};
--- a/src/utils/latl/test/codeGenerator.test.js
+++ b/src/utils/latl/test/codeGenerator.test.js
@ -0,0 +1,10 @@
+import { assertionData } from './assertionData';
+import { codeGenerator } from '../codeGenerator';
+
+describe('codeGenerator', () => {
+  it('parses simple comment', () => {
+    const { latl, code } = assertionData.simpleComment;
+    const generatedCode = codeGenerator(latl);
+    expect(generatedCode).toEqual(code);
+  });
+})
--- a/src/utils/latl/test/lexer.test.js
+++ b/src/utils/latl/test/lexer.test.js
@ -0,0 +1,71 @@
+import { lexer } from '../lexer';
+import { assertionData } from './assertionData';
+
+describe('lexer', () => {
+  const getToken    = obj => obj ? formatToken(obj) : null;
+  const formatToken = obj => ({ type: obj.type, value: obj.value });
+  const getStream   = latl => {
+    lexer.reset(latl);
+    let token = getToken(lexer.next());
+    let stream = [];
+    do {
+      stream = [...stream, token]
+      token = getToken(lexer.next());
+    } while (token);
+    return stream;
+  }
+
+  it('lexes simple comment', () => {
+    const { latl, tokens } = assertionData.simpleComment;
+    const stream           = getStream(latl);
+    expect(stream).toStrictEqual(tokens);
+  });
+
+  // it('lexes simple * and identifier', () => {
+  //   lexer.reset('*proto');
+  //   const stream = [ getToken(lexer.next()), getToken(lexer.next()) ];
+  //   expect(stream).toStrictEqual([ { type: 'star', value: '*' }, { type: 'identifier', value: 'proto' } ]);
+  // })
+
+  it('lexes set and identifier', () => {
+    const { latl, tokens } = assertionData.simpleSetDefinition;
+    const stream           = getStream(latl);
+    expect(stream).toStrictEqual(tokens);
+  })
+
+  it('lexes multiple set definitions with comma operator', () => {
+    const { latl, tokens } = assertionData.commaSetDefinition;
+    const stream           = getStream(latl);
+    expect(stream).toStrictEqual(tokens);
+  });
+
+  it('lexes set definition with alias', () => {
+    const { latl, tokens } = assertionData.setAliasDefinition;
+    const stream           = getStream(latl);
+    expect(stream).toStrictEqual(tokens);
+  });
+
+  it('lexes set definition with set join', () => {
+    const { latl, tokens } = assertionData.setDefinitionJoin;
+    const stream           = getStream(latl);
+    expect(stream).toStrictEqual(tokens);
+  });
+
+  it('lexes set definition with yield operation', () => {
+    const { latl, tokens } = assertionData.setDefinitionYield;
+    const stream           = getStream(latl);
+    expect(stream).toStrictEqual(tokens);
+  });
+
+  it('lexes all set join operations', () => {
+    const { latl, tokens } = assertionData.setOperationsJoin;
+    const stream           = getStream(latl);
+    expect(stream).toStrictEqual(tokens);
+  });
+
+  it('lexes set filter, concat, and dissoc operations', () => {
+    const { latl, tokens } = assertionData.setOperations;
+    const stream           = getStream(latl);
+    expect(stream).toStrictEqual(tokens);
+  })
+})
--- a/src/utils/latl/test/parser.test.js
+++ b/src/utils/latl/test/parser.test.js
@ -0,0 +1,180 @@
+import { lexer } from "../lexer";
+import { parser } from "../parser";
+import { assertionData } from "./assertionData";
+
+describe("parser", () => {
+  it("parses simple comment", () => {
+    const { latl, AST } = assertionData.simpleComment;
+    const feedResults = parser().feed(latl).results;
+    expect(feedResults.length).toBe(1);
+    expect(feedResults[0]).toStrictEqual(AST);
+  });
+
+  it("parses simple set definition", () => {
+    const { latl, AST } = assertionData.simpleSetDefinition;
+    const feedResults = parser().feed(latl).results;
+    expect(feedResults.length).toBe(1);
+    expect(feedResults[0]).toStrictEqual(AST);
+  });
+
+  it("parses multiple set definitions with comma operator", () => {
+    const { latl, AST } = assertionData.commaSetDefinition;
+    const feedResults = parser().feed(latl).results;
+    expect(feedResults.length).toBe(1);
+    expect(feedResults[0]).toStrictEqual(AST);
+  });
+
+  it("lexes set definition with alias", () => {
+    const { latl, AST } = assertionData.setAliasDefinition;
+    const feedResults = parser().feed(latl).results;
+    expect(feedResults[0]).toStrictEqual(AST);
+  });
+
+  it.skip("lexes set definition with set join", () => {
+    const { latl, AST } = assertionData.setDefinitionJoin;
+    const feedResults = parser().feed(latl).results;
+    expect(feedResults[0]).toStrictEqual(AST);
+  });
+
+  it.todo(
+    "lexes set definition with yield operation"
+    // , () => {
+    //   const { latl, tokens } = assertionData.setDefinitionYield;
+    //   const stream           = getStream(latl);
+    //   expect(stream).toStrictEqual(tokens);
+    // }
+  );
+
+  it.todo(
+    "lexes all set join operations"
+    // , () => {
+    //   const { latl, tokens } = assertionData.setOperationsJoin;
+    //   const stream           = getStream(latl);
+    //   expect(stream).toStrictEqual(tokens);
+    // }
+  );
+
+  it.todo(
+    "lexes set filter, concat, and dissoc operations"
+    // , () => {
+    //   const { latl, tokens } = assertionData.setOperations;
+    //   const stream           = getStream(latl);
+    //   expect(stream).toStrictEqual(tokens);
+    // }
+  );
+});
+
+// {
+//   "set":
+//     [
+//       [
+//         [
+//           {
+//             "col": 5,
+//             "line": 2,
+//             "lineBreaks": 0,
+//             "offset": 5,
+//             "text": "NASAL_PULMONIC_CONSONANTS",
+//             "toString": [tokenToString],
+//             "type": "setIdentifier",
+//             "value": "NASAL_PULMONIC_CONSONANTS",
+//           },
+//           null,
+//           {
+//             "col": 45,
+//             "line": 2,
+//             "lineBreaks": 0,
+//             "offset": 45,
+//             "text": "=",
+//             "toString": [tokenToString],
+//             "type": "equal",
+//             "value": "=",
+//           },
+//           null,
+//           [
+//             [
+//               {
+//                 "col": 49,
+//                 "line": 2,
+//                 "lineBreaks": 0,
+//                 "offset": 49,
+//                 "text": "m̥",
+//                 "toString": [tokenToString],
+//                 "type": "phone",
+//                 "value": "m̥",
+//               },
+//               {
+//                 "col": 91,
+//                 "line": 2,
+//                 "lineBreaks": 0,
+//                 "offset": 91,
+//                 "text": "ɴ",
+//                 "toString": [tokenToString],
+//                 "type": "phone",
+//                 "value": "ɴ",
+//               },
+//             ],
+//           ],
+//           {
+//             "col": 94,
+//             "line": 2,
+//             "lineBreaks": 0,
+//             "offset": 94,
+//             "text": ",",
+//             "toString": [tokenToString],
+//             "type": "comma",
+//             "value": ",",
+//           },
+//           null,
+//         ],
+//               ],
+//     -         "setIdentifier": "STOP_PULMONIC_CONSONANTS",
+//       {
+//         "col": 5,
+//         "line": 3,
+//         "lineBreaks": 0,
+//         "offset": 100,
+//         "text": "STOP_PULMONIC_CONSONANTS",
+//         "toString": [tokenToString],
+//         "type": "setIdentifier",
+//         "value": "STOP_PULMONIC_CONSONANTS",
+//       },
+//       null,
+//       {
+//         "col": 45,
+//         "line": 3,
+//         "lineBreaks": 0,
+//         "offset": 140,
+//         "text": "=",
+//         "toString": [tokenToString],
+//         "type": "equal",
+//         "value": "=",
+//               },
+//       null,
+//       [
+//         [
+//           {
+//             "col": 49,
+//             "line": 3,
+//             "lineBreaks": 0,
+//             "offset": 144,
+//             "text": "p",
+//             "toString": [tokenToString],
+//             "type": "phone",
+//             "value": "p",
+//           },
+//           {
+//             "col": 104,
+//             "line": 3,
+//             "lineBreaks": 0,
+//             "offset": 199,
+//             "text": "ʔ",
+//             "toString": [tokenToString],
+//             "type": "phone",
+//             "value": "ʔ",
+//           },
+//         ],
+//       ],
+//     ],
+//     "token": "kwSet",
+//   }
Author	SHA1	Message	Date
Sorrel	96bbb274df	Create LICENSE	2021-04-14 20:34:07 -04:00
Sorrel Bri	bb69a9ffa4	patch test bug incorrectly oriented square brackets	2020-05-21 19:36:43 -07:00
Sorrel Bri	dfae87e408	stub working parse of or Operation on sets; phoneList being read as setAlias	2020-05-21 19:02:18 -07:00
Sorrel Bri	c264b56c2e	stub AST results for set definition with join	2020-05-18 22:37:19 -07:00
Sorrel Bri	73761e6f60	fix syntax errors in example latl file	2020-05-18 22:02:00 -07:00
Sorrel Bri	bb8c05a579	add support for set aliases	2020-05-09 22:18:07 -07:00
Sorrel Bri	9619b4a07c	update latl README with set definition	2020-05-09 16:24:00 -07:00
Sorrel Bri	abfe14b410	construct AST properly for multi set definitions	2020-05-09 15:22:01 -07:00
Sorrel Bri	40aec30537	parse AST for single set definition	2020-05-08 23:32:49 -07:00
Sorrel Bri	3d4d1cd66e	hack set definition postprocessors	2020-05-07 23:24:19 -07:00
Sorrel Bri	dee27b0d30	init codeGenerator in latl	2020-05-06 22:31:15 -07:00
Sorrel Bri	432630e600	add postprocessors to grammar.ne for cleaning tree of empty nodes	2020-04-14 22:03:56 -07:00
Sorrel Bri	aa19d42a11	stub parser	2020-03-27 15:55:45 -07:00
Sorrel Bri	7c75be543f	define tokens for lexing set [concat], [dissoc] operations	2020-03-15 21:40:31 -07:00
Sorrel Bri	a7dad0d3e5	define tokens for lexing set [] in, yield [] operations	2020-03-14 23:06:15 -07:00
Sorrel Bri	2634e35a01	define tokens for lexing set definitions, aliases, or operation, and aliases	2020-03-14 22:14:31 -07:00
Sorrel Bri	6e230de7f0	stub language spec and example files	2020-03-13 14:13:01 -07:00
Sorrel Bri	f5a712557c	init parser with nearley	2020-03-12 12:38:52 -07:00
Sorrel Bri	e08500a047	init lexer with moo	2020-03-11 21:09:41 -07:00
Sorrel Bri	3f2c822c55	patch phoneme feature bug, add initWaffleState	2020-03-04 16:27:26 -08:00
Sorrel Bri	ad364bbd07	debug for waffle present	2020-03-04 15:15:07 -08:00
Sorrel Bri	c653653ba1	support for epoch and features, lexicon support still buggy	2020-03-03 20:32:54 -08:00
Sorrel Bri	20bede405f	patch issues with phone token context	2020-03-03 18:12:38 -08:00
Sorrel Bri	5c2138e04f	patch for improved character support in spacing modifier range	2020-03-03 01:33:28 -08:00
Sorrel Bri	d3ebe61577	add latl parse for features	2020-03-03 01:20:06 -08:00
Sorrel Bri	da45699c59	debug parse_latl, hook up Output to state	2020-03-02 22:46:08 -08:00
Sorrel Bri	78b513c9be	add support for extended IPA, greek characters, etc, with phone token	2020-03-02 20:48:42 -08:00
Sorrel Bri	4ee5bc0f78	hook input on LatlOutput to dispatch function	2020-03-02 19:14:51 -08:00
Sorrel Bri	49419a39ee	test green for run from parsed epoch latl	2020-03-02 19:06:21 -08:00
Sorrel Bri	35f815a9c9	add AST parsing support for epoch definitions	2020-03-02 15:06:59 -08:00
Sorrel Bri	64b2b5d332	stub AST parser	2020-03-01 23:17:57 -08:00
Sorrel Bri	686a1b1ffc	refactor tokenize to return token objects	2020-03-01 23:03:33 -08:00
Sorrel Bri	6bd425ac34	add tokenizer for epoch, feature, and lexicon tokens	2020-03-01 22:42:35 -08:00
Sorrel Bri	d5d1eb2fa2	stub parse_latl reducer action	2020-03-01 20:55:23 -08:00
Sorrel Bri	6bdd0a9d65	patch revert some of Epoch refactor	2020-03-01 15:49:56 -08:00
Sorrel Bri	74bbca028f	refactor Epoch component	2020-03-01 15:41:25 -08:00
Sorrel Bri	c13cc33697	patch to fix error messaging tests	2020-03-01 12:59:41 -08:00
Sorrel Bri	22b4adb547	add router to componenet tests	2020-02-29 12:59:33 -08:00
Sorrel Bri	201b4ca8b9	stub latl reducer	2020-02-29 12:52:20 -08:00
Sorrel Bri	ff681e6223	stub style for latl	2020-02-29 12:44:02 -08:00
Sorrel Bri	b9b30014c7	stub #/latl route components	2020-02-28 18:41:42 -08:00
Sorrel Bri	4b77f69cd3	init latl	2020-02-28 17:44:36 -08:00
Sorrel Bri	ca7aea4ce3	patch with updated name and title	2020-02-28 17:07:20 -08:00
Sorrel Bri	2d31a20f4b	patch grid gap style	2020-02-28 13:30:48 -08:00
Sorrel Bri	156b05ec42	patch typos in readme	2020-02-28 13:27:55 -08:00
Sorrel Bri	0dfd40dff3	patch typos in readme	2020-02-28 13:14:29 -08:00
Sorrel Bri	e570bdfeff	add feature remove button, style buttons	2020-02-28 13:12:19 -08:00