From 64b2b5d33237599cbc048b1990154832a775c556 Mon Sep 17 00:00:00 2001
From: Sorrel Bri <sorrel.bri.june@gmail.com>
Date: Sun, 1 Mar 2020 23:17:57 -0800
Subject: [PATCH] stub AST parser

---
 src/reducers/reducer.latl.js      | 11 +++++++++++
 src/reducers/reducer.latl.test.js | 21 ++++++++++++++++++++-
 2 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/src/reducers/reducer.latl.js b/src/reducers/reducer.latl.js
index cf74b31..84bb3fe 100644
--- a/src/reducers/reducer.latl.js
+++ b/src/reducers/reducer.latl.js
@@ -38,12 +38,23 @@ export const tokenize = latl => {
   }
 }
 
+const addToken = (tree, token, index, tokens) => {
+  console.log(tokens[index - 1], token)
+  return tree;
+}
+
+export const buildTree = tokens => {
+  return tokens.reduce(addToken, {})
+}
+
 export const generateAST = latl => {
   // tokenize
   const tokens = tokenize(latl);
 
   // build tree
+  const tree = buildTree(tokens);
 
+  return tree;
 }
 
 const tokenTypes = [
diff --git a/src/reducers/reducer.latl.test.js b/src/reducers/reducer.latl.test.js
index 36769d9..f786835 100644
--- a/src/reducers/reducer.latl.test.js
+++ b/src/reducers/reducer.latl.test.js
@@ -1,6 +1,6 @@
 import { stateReducer } from './reducer';
 import { initState } from './reducer.init';
-import { tokenize } from './reducer.latl';
+import { tokenize, buildTree } from './reducer.latl';
 
 describe('LATL', () => {
   it('returns state unaltered with no action body', () => {
@@ -35,6 +35,11 @@ describe('LATL', () => {
     expect(tokens).toStrictEqual(tokenizedLatl);
   });
 
+  it('returns AST from well-formed epoch tokens', () => {
+    const tree = buildTree(tokenizedEpoch);
+    expect(tree).toStrictEqual(treeEpoch);
+  })
+
 })
 const epochDefinitionLatl = `
 *PROTO
@@ -56,6 +61,20 @@ const tokenizedEpoch = [
   { type: "pipe", value: "|" }, { type: "variable", value: "CHILD" }
 ]
 
+const treeEpoch = {
+  epochs: [
+    {
+      parent: 'PROTO',
+      name: 'CHILD',
+      index: 0,
+      changes: [
+        '[+ FEATURE]>[- FEATURE]/._.',
+        'n>m/#_.'
+      ]
+    }
+  ]
+}
+
 const featureDefinitionLatl = `
 [+ PLOSIVE] = kp / p / b / d / t / g / k
 [- PLOSIVE] = m / n / s / z