add postprocessors to grammar.ne for cleaning tree of empty nodes

src/utils/latl/grammar.js

@@ -5,47 +5,46 @@ 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 getAll = d => d.map((item, i) => ({ [i]: item }));
-  const flag = token => d => d.map(item => ({[token]: item}))
+  const flag = token => d => d.map(item => ({ [token]: item }))
   const clearNull = d => d.filter(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.type === 'setIdentifier') acc.push({set: t});
     if (t && t.length) acc[acc.length - 1].phones = t;
     return acc;
   }, []);
-  const compose = (...funcs) => d => funcs.reduce((acc, func) => func(acc), d)
+  const pipe = (...funcs) => d => funcs.reduce((acc, func) => func(acc), d);
 var grammar = {
     Lexer: lexer,
     ParserRules: [
     {"name": "main$ebnf$1", "symbols": []},
-    {"name": "main$ebnf$1$subexpression$1", "symbols": ["statement"]},
+    {"name": "main$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$1"], "postprocess": compose(flag('main'), getTerminal)},
+    {"name": "main", "symbols": ["main$ebnf$1"], "postprocess": pipe(clearNull, flag('main'), getTerminal)},
     {"name": "_$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$1"], "postprocess": remove},
     {"name": "__", "symbols": [(lexer.has("whiteSpace") ? {type: "whiteSpace"} : whiteSpace)], "postprocess": remove},
     {"name": "statement", "symbols": ["comment"]},
-    {"name": "statement", "symbols": ["definition"], "postprocess": compose(clearNull, getTerminal)},
+    {"name": "statement", "symbols": ["definition"], "postprocess": getTerminal, clearNull},
-    {"name": "comment", "symbols": [(lexer.has("comment") ? {type: "comment"} : comment)], "postprocess": compose(remove, getTerminal)},
+    {"name": "comment", "symbols": [(lexer.has("comment") ? {type: "comment"} : comment)], "postprocess": pipe(getTerminal, remove)},
-    {"name": "definition", "symbols": [(lexer.has("kwSet") ? {type: "kwSet"} : kwSet), "__", "setDefinition"], "postprocess": d => ({token: 'setDefinition', sets: d[2]})},
+    {"name": "definition", "symbols": [(lexer.has("kwSet") ? {type: "kwSet"} : kwSet), "__", "setDefinition"], "postprocess": d => ({token: d[0].type, [d[0].value]: d[2]})},
     {"name": "setDefinition$ebnf$1", "symbols": []},
     {"name": "setDefinition$ebnf$1$subexpression$1", "symbols": [(lexer.has("setIdentifier") ? {type: "setIdentifier"} : setIdentifier), "__", (lexer.has("equal") ? {type: "equal"} : equal), "__", "setExpression", (lexer.has("comma") ? {type: "comma"} : comma), "__"]},
     {"name": "setDefinition$ebnf$1", "symbols": ["setDefinition$ebnf$1", "setDefinition$ebnf$1$subexpression$1"], "postprocess": function arrpush(d) {return d[0].concat([d[1]]);}},
-    {"name": "setDefinition", "symbols": ["setDefinition$ebnf$1", (lexer.has("setIdentifier") ? {type: "setIdentifier"} : setIdentifier), "__", (lexer.has("equal") ? {type: "equal"} : equal), "__", "setExpression"], "postprocess": constructSet},
+    {"name": "setDefinition", "symbols": ["setDefinition$ebnf$1", (lexer.has("setIdentifier") ? {type: "setIdentifier"} : setIdentifier), "__", (lexer.has("equal") ? {type: "equal"} : equal), "__", "setExpression"]},
     {"name": "setExpression", "symbols": [(lexer.has("openSquareBracket") ? {type: "openSquareBracket"} : openSquareBracket), "_", "phoneList", "_", (lexer.has("closeSquareBracket") ? {type: "closeSquareBracket"} : closeSquareBracket)], "postprocess": d => d.filter(t => t && t.length)},
     {"name": "phoneList$ebnf$1", "symbols": []},
     {"name": "phoneList$ebnf$1$subexpression$1", "symbols": [(lexer.has("phone") ? {type: "phone"} : phone), (lexer.has("comma") ? {type: "comma"} : comma), "_"]},
     {"name": "phoneList$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$1", (lexer.has("phone") ? {type: "phone"} : phone)], "postprocess":  d => d.filter(t => t && (t.type === 'phone' || t.length) )
+    {"name": "phoneList", "symbols": ["phoneList$ebnf$1", (lexer.has("phone") ? {type: "phone"} : phone)], "postprocess":  d => d.filter(t => t && (t.type === 'phone' || t[0]) )
-        .map(t => {
+        .flatMap(t => {
           if (!t.length) return t;
-          t.filter(st => st && st.type === 'phone')
+          return t[0].filter(st => st && st.type === 'phone')
-          return t;
         }) }
 ]
   , ParserStart: "main"

src/utils/latl/grammar.ne

@@ -1,24 +1,24 @@
 @{%
   const { lexer } = require('./lexer.js');
   const getTerminal = d => d ? d[0] : null;
-  const getAll = d => d.map((item, i) => ({[i]: item}));
+  const getAll = d => d.map((item, i) => ({ [i]: item }));
-  const flag = token => d => d.map(item => ({[token]: item}))
+  const flag = token => d => d.map(item => ({ [token]: item }))
   const clearNull = d => d.filter(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.type === 'setIdentifier') acc.push({set: t});
     if (t && t.length) acc[acc.length - 1].phones = t;
     return acc;
   }, []);
-  const compose = (...funcs) => d => funcs.reduce((acc, func) => func(acc), d)
+  const pipe = (...funcs) => d => funcs.reduce((acc, func) => func(acc), d);
 %}
 
 @lexer lexer
 
-main            -> (statement):* 
+main            -> (_ statement _):* 
-  {% compose(flag('main'), getTerminal) %}
+  {% pipe(clearNull, flag('main'), getTerminal) %}
 
 _               -> (%whiteSpace):? 
   {% remove %}
@@ -27,23 +27,26 @@ __              -> %whiteSpace
   {% remove %}
 
 statement       -> comment | definition
-  {% compose(clearNull, getTerminal) %}
+  {% getTerminal, clearNull %}
 
 comment         -> %comment 
-  {% compose(remove, getTerminal) %}
+  {% pipe(getTerminal, remove) %}
 
 # SETS
-definition      -> %kwSet __ setDefinition {% d => ({token: 'setDefinition', sets: d[2]}) %}
+definition      -> %kwSet __ setDefinition 
+                {% d => ({token: d[0].type, [d[0].value]: d[2]}) %}
 setDefinition   -> (%setIdentifier __ %equal __ setExpression %comma __):* %setIdentifier __ %equal __ setExpression
-  {% constructSet %}
+                # {% pipe(
+                #   //constructSet, 
+                #   getTerminal) %}
 setExpression   -> %openSquareBracket _ phoneList _ %closeSquareBracket
   {% d => d.filter(t => t && t.length) %}
 phoneList       -> (%phone %comma _):* %phone
-  {% d => d.filter(t => t && (t.type === 'phone' || t.length) )
+                # {% clearNull %}
-  .map(t => {
+  {% d => d.filter(t => t && (t.type === 'phone' || t[0]) )
+  .flatMap(t => {
     if (!t.length) return t;
-    t.filter(st => st && st.type === 'phone')
+    return t[0].filter(st => st && st.type === 'phone')
-    return t;
   }) %}
 
 

src/utils/latl/test/parser.test.js

@@ -7,15 +7,14 @@ describe('parser', () => {
     const { latl } = assertionData.simpleComment;
     const AST = parser().feed(latl).results;
     expect(AST.length).toBe(1);
-    console.log(AST[0])
+    expect(AST[0]).toStrictEqual({ main: [ null ]})
-    // expect(AST[0]).toStrictEqual()
   })
 
-  // it('parses multiple set definitions with comma operator', () => {
+  it('parses multiple set definitions with comma operator', () => {
-  //   const { latl } = assertionData.commaSetDefinition;
+    const { latl } = assertionData.commaSetDefinition;
-  //   const AST = parser().feed(latl)
+    const AST = parser().feed(latl).results;
-  //   console.log(AST)
+    console.log(AST[0])
-  // });
+  });
 
   // it('lexes set definition with alias', () => {
   //   const { latl, tokens } = assertionData.setAliasDefinition;