js.pegjs

// Lite Grammar (Modified by duangsuse from JavaScript PEG.js Grammar)
//
// ==================
//
// Some rules from PEG.js JavaScript parser is Based on grammar from ECMA-262, 5.1 Edition [1].
//
// Many thanks to inimino [3] for his grammar [4] which helped me to solve some
// problems (such as automatic semicolon insertion) and also served to double
// check that I converted the original grammar correctly.
//
// [1] http://www.ecma-international.org/publications/standards/Ecma-262.htm
// [2] https://github.com/estree/estree
// [3] http://inimino.org/~inimino/blog/
// [4] http://boshi.inimino.org/3box/asof/1270029991384/PEG/ECMAScript_unified.peg

// Complete Lite Desugared Syntax（DNF 范式, 是 duangsuse 设计的一种即使没有规则你们也能看懂的无上下文词条流模式文法描述）

// Lite 的一个比较特殊的地方在于使用缩进语义, 我也是为了好看... 不过如果使用递归下降法, 解析不是问题耶
// Lite Desugared 不包含特殊的字符串语法糖，也不包含缩进语义，标准 Lite 语法经过 Lite Lexer 和 Flatter 处理后可以交由此 JavaScript Parser 解析序列化 AST
// 强制你使用 duangsuse 喜欢的 2 空格缩进代码风格, 语言本身类似 Ruby（Ruby 岛国语言好耶）
// 有趣的语法: ![str1 str2 str3].each { |e| puts e } if a == 1 & b === :c

// math -> expr Maybe( '+' OR '-' OR '*' OR '/' OR '**' OR '%' OR '<' OR '<=' OR '>' OR '>=' OR '&' OR '|' OR '==' OR '===' OR '!=' OR '<<' OR 'and' OR 'or' ) expr
// binary -> math | cast | dot | in | square | arrow | range
// range -> expr '..' expr
// paren_expression -> '(' expression ')'
// expression -> binary | list | table | value | incDec | not | negative | call | identifier | index | bracket_block | do_block | paren_expression
// statement -> def | for | scope | while | when | if | simple_statement
// simple_statement -> break | next | import | require | return | assignment | indexLet | square | arrow | dot | incDec | call Maybe( IF expression )
// block -> Ary( statement NEWLINE ) END
// for -> FOR identifier IN expression NEWLINE block
// while -> WHILE expression NEWLINE block
// scope -> SCOPE Maybe( label ) NEWLINE block
// when -> WHEN expression NEWLINE Ary( expression Maybe( expression ) NEWLINE block ) END | when_is
// when_is -> WHEN expression NEWLINE Ary( IS Ary( expression OR ) NEWLINE block ) END
// indexLet -> expression '[' expression ']' '=' expression
// index -> expression '[' expression ']'
// if -> IF expression NEWLINE block Maybe( Ary( ELIF expression NEWLINE block ) ) Maybe( ELSE NEWLINE block )
// identifier -> Maybe( AT ) label
// def -> DEF identifier Maybe( nameList ) NEWLINE block
// call -> identifier Maybe( CALL OR exprList )
// assignment -> identifier '=' expression
// not -> '!' expression
// negative -> '-' expression
// incDec -> identifier Maybe( '++' OR '--' )
// return -> RETURN expression
// require -> REQUIRE tokensAsString()
// next -> NEXT
// break -> BREAK
// import -> IMPORT tokensAsString()
// value -> TRUE | FALSE | NIL | Number | string
// string -> '"' data '"' | stringB | stringC
// stringB -> "'" data "'"
// stringC -> ':' data
// list -> Maybe( '!' ) '[' exprList ']'
// table -> '{' kvList '}'
// kvList -> Ary( label ':' expression Maybe( ',' OR NEWLINE ) )
// arrow -> expression '->' label expression
// square -> expression '::' label
// in -> expression IN expression
// dot -> expression '.' label Maybe( '()' OR exprList )
// cast -> expression AS label
// exprList -> Ary( expr Maybe( ' ' OR ',' ) )
// nameList -> Maybe( '(' ) Ary( name Maybe( ',' OR ' ' ) ) Maybe( ')' ) | nameListB
// nameListB -> '|' Ary( name Maybe( ',' OR ' ' ) ) '|'
// bracket_block -> '{' Maybe( nameListB ) Ary( ':' simple_statement ) '}'
// do_block -> DO Maybe ( nameListB ) block

// JavaScript Helper code from PEG.js JavaScript parser
{
  var TYPES_TO_PROPERTY_NAMES = {
    CallExpression:   "callee",
    MemberExpression: "object",
  };

  function filledArray(count, value) {
    return Array.apply(null, new Array(count))
      .map(function() { return value; });
  }

  function extractOptional(optional, index) {
    return optional ? optional[index] : null;
  }

  function extractList(list, index) {
    return list.map(function(element) { return element[index]; });
  }

  function buildList(head, tail, index) {
    return [head].concat(extractList(tail, index));
  }

  function buildBinaryExpression(head, tail) {
    return tail.reduce(function(result, element) {
      return {
        type: "BinaryExpression",
        operator: element[1],
        left: result,
        right: element[3]
      };
    }, head);
  }

  function buildLogicalExpression(head, tail) {
    return tail.reduce(function(result, element) {
      return {
        type: "LogicalExpression",
        operator: element[1],
        left: result,
        right: element[3]
      };
    }, head);
  }

  function optionalList(value) {
    return value !== null ? value : [];
  }
}

// Begin parser description

Start
  = __ program:Program __ { return program; }

// ----- A.1 Lexical Grammar -----

SourceCharacter
  = .

WhiteSpace "whitespace"
  = "\t"
  / "\v"
  / "\f"
  / " "
  / "\u00A0"
  / "\uFEFF"
  / Zs

LineTerminator
  = [\n\r\u2028\u2029]

LineTerminatorSequence "end of line"
  = "\n"
  / "\r\n"
  / "\r"
  / "\u2028"
  / "\u2029"

Comment "comment"
  = MultiLineComment
  / SingleLineComment

MultiLineComment
  = "####>" (!"####<" SourceCharacter)* "####<"

MultiLineCommentNoLineTerminator
  = "####>" (!("####<" / LineTerminator) SourceCharacter)* "####<"

SingleLineComment
  = "#" (!LineTerminator SourceCharacter)*

Identifier
  = !ReservedWord name:IdentifierName { return name; }

IdentifierName "identifier"
  = head:IdentifierStart tail:IdentifierPart* {
      return {
        type: "Identifier",
        name: head + tail.join("")
      };
    }

IdentifierStart
  = UnicodeLetter
  / "$"
  / "_"
  / "\\" sequence:UnicodeEscapeSequence { return sequence; }

IdentifierPart
  = IdentifierStart
  / UnicodeCombiningMark
  / UnicodeDigit
  / UnicodeConnectorPunctuation
  / "\u200C"
  / "\u200D"

UnicodeLetter
  = Lu
  / Ll
  / Lt
  / Lm
  / Lo
  / Nl

UnicodeCombiningMark
  = Mn
  / Mc

UnicodeDigit
  = Nd

UnicodeConnectorPunctuation
  = Pc

Keyword
  = BreakToken
  / CaseToken
  / CatchToken
  / ContinueToken
  / DebuggerToken
  / DefaultToken
  / DeleteToken
  / DoToken
  / ElseToken
  / FinallyToken
  / ForToken
  / FunctionToken
  / IfToken
  / InstanceofToken
  / InToken
  / NewToken
  / ReturnToken
  / SwitchToken
  / ThisToken
  / ThrowToken
  / TryToken
  / TypeofToken
  / VarToken
  / VoidToken
  / WhileToken
  / WithToken

ReservedWord
  = Keyword
  / NullLiteral
  / BooleanLiteral

// Primitives

Literal
  = NullLiteral
  / BooleanLiteral
  / NumericLiteral
  / StringLiteral

NullLiteral
  = NullToken { return { type: "Literal", value: null }; }

BooleanLiteral
  = TrueToken  { return { type: "Literal", value: true  }; }
  / FalseToken { return { type: "Literal", value: false }; }

// The "!(IdentifierStart / DecimalDigit)" predicate is not part of the official
// grammar, it comes from text in section 7.8.3.
NumericLiteral "number"
  = literal:HexIntegerLiteral !(IdentifierStart / DecimalDigit) {
      return literal;
    }
  / literal:DecimalLiteral !(IdentifierStart / DecimalDigit) {
      return literal;
    }

DecimalLiteral
  = DecimalIntegerLiteral "." DecimalDigit* ExponentPart? {
      return { type: "Literal", value: parseFloat(text()) };
    }
  / "." DecimalDigit+ ExponentPart? {
      return { type: "Literal", value: parseFloat(text()) };
    }
  / DecimalIntegerLiteral ExponentPart? {
      return { type: "Literal", value: parseFloat(text()) };
    }

DecimalIntegerLiteral
  = "0"
  / NonZeroDigit DecimalDigit*

DecimalDigit
  = [0-9]

NonZeroDigit
  = [1-9]

ExponentPart
  = ExponentIndicator SignedInteger

ExponentIndicator
  = "e"i

SignedInteger
  = [+-]? DecimalDigit+

HexIntegerLiteral
  = "0x"i digits:$HexDigit+ {
      return { type: "Literal", value: parseInt(digits, 16) };
     }

HexDigit
  = [0-9a-f]i

StringLiteral "string"
  = '"' chars:DoubleStringCharacter* '"' {
      return { type: "Literal", value: chars.join("") };
    }
  / "'" chars:SingleStringCharacter* "'" {
      return { type: "Literal", value: chars.join("") };
    }

DoubleStringCharacter
  = !('"' / "\\" / LineTerminator) SourceCharacter { return text(); }
  / "\\" sequence:EscapeSequence { return sequence; }
  / LineContinuation

SingleStringCharacter
  = !("'" / "\\" / LineTerminator) SourceCharacter { return text(); }
  / "\\" sequence:EscapeSequence { return sequence; }
  / LineContinuation

LineContinuation
  = "\\" LineTerminatorSequence { return ""; }

EscapeSequence
  = CharacterEscapeSequence
  / "0" !DecimalDigit { return "\0"; }
  / HexEscapeSequence
  / UnicodeEscapeSequence

CharacterEscapeSequence
  = SingleEscapeCharacter
  / NonEscapeCharacter

SingleEscapeCharacter
  = "'"
  / '"'
  / "\\"
  / "b"  { return "\b"; }
  / "f"  { return "\f"; }
  / "n"  { return "\n"; }
  / "r"  { return "\r"; }
  / "t"  { return "\t"; }
  / "v"  { return "\v"; }

NonEscapeCharacter
  = !(EscapeCharacter / LineTerminator) SourceCharacter { return text(); }

EscapeCharacter
  = SingleEscapeCharacter
  / DecimalDigit
  / "x"
  / "u"

HexEscapeSequence
  = "x" digits:$(HexDigit HexDigit) {
      return String.fromCharCode(parseInt(digits, 16));
    }

UnicodeEscapeSequence
  = "u" digits:$(HexDigit HexDigit HexDigit HexDigit) {
      return String.fromCharCode(parseInt(digits, 16));
    }

// Unicode Character Categories
//
// Extracted from the following Unicode Character Database file:
//
//   http://www.unicode.org/Public/8.0.0/ucd/extracted/DerivedGeneralCategory.txt
//
// Unix magic used:
//
//   grep "; $CATEGORY" DerivedGeneralCategory.txt |   # Filter characters
//     cut -f1 -d " " |                                # Extract code points
//     grep -v '[0-9a-fA-F]\{5\}' |                    # Exclude non-BMP characters
//     sed -e 's/\.\./-/' |                            # Adjust formatting
//     sed -e 's/\([0-9a-fA-F]\{4\}\)/\\u\1/g' |       # Adjust formatting
//     tr -d '\n'                                      # Join lines
//
// ECMA-262 allows using Unicode 3.0 or later, version 8.0.0 was the latest one
// at the time of writing.
//
// Non-BMP characters are completely ignored to avoid surrogate pair handling
// (detecting surrogate pairs isn't possible with a simple character class and
// other methods would degrade performance). I don't consider it a big deal as
// even parsers in JavaScript engines of common browsers seem to ignore them.

// Letter, Lowercase
Ll = [\u0061-\u007A\u00B5\u00DF-\u00F6\u00F8-\u00FF\u0101\u0103\u0105\u0107\u0109\u010B\u010D\u010F\u0111\u0113\u0115\u0117\u0119\u011B\u011D\u011F\u0121\u0123\u0125\u0127\u0129\u012B\u012D\u012F\u0131\u0133\u0135\u0137-\u0138\u013A\u013C\u013E\u0140\u0142\u0144\u0146\u0148-\u0149\u014B\u014D\u014F\u0151\u0153\u0155\u0157\u0159\u015B\u015D\u015F\u0161\u0163\u0165\u0167\u0169\u016B\u016D\u016F\u0171\u0173\u0175\u0177\u017A\u017C\u017E-\u0180\u0183\u0185\u0188\u018C-\u018D\u0192\u0195\u0199-\u019B\u019E\u01A1\u01A3\u01A5\u01A8\u01AA-\u01AB\u01AD\u01B0\u01B4\u01B6\u01B9-\u01BA\u01BD-\u01BF\u01C6\u01C9\u01CC\u01CE\u01D0\u01D2\u01D4\u01D6\u01D8\u01DA\u01DC-\u01DD\u01DF\u01E1\u01E3\u01E5\u01E7\u01E9\u01EB\u01ED\u01EF-\u01F0\u01F3\u01F5\u01F9\u01FB\u01FD\u01FF\u0201\u0203\u0205\u0207\u0209\u020B\u020D\u020F\u0211\u0213\u0215\u0217\u0219\u021B\u021D\u021F\u0221\u0223\u0225\u0227\u0229\u022B\u022D\u022F\u0231\u0233-\u0239\u023C\u023F-\u0240\u0242\u0247\u0249\u024B\u024D\u024F-\u0293\u0295-\u02AF\u0371\u0373\u0377\u037B-\u037D\u0390\u03AC-\u03CE\u03D0-\u03D1\u03D5-\u03D7\u03D9\u03DB\u03DD\u03DF\u03E1\u03E3\u03E5\u03E7\u03E9\u03EB\u03ED\u03EF-\u03F3\u03F5\u03F8\u03FB-\u03FC\u0430-\u045F\u0461\u0463\u0465\u0467\u0469\u046B\u046D\u046F\u0471\u0473\u0475\u0477\u0479\u047B\u047D\u047F\u0481\u048B\u048D\u048F\u0491\u0493\u0495\u0497\u0499\u049B\u049D\u049F\u04A1\u04A3\u04A5\u04A7\u04A9\u04AB\u04AD\u04AF\u04B1\u04B3\u04B5\u04B7\u04B9\u04BB\u04BD\u04BF\u04C2\u04C4\u04C6\u04C8\u04CA\u04CC\u04CE-\u04CF\u04D1\u04D3\u04D5\u04D7\u04D9\u04DB\u04DD\u04DF\u04E1\u04E3\u04E5\u04E7\u04E9\u04EB\u04ED\u04EF\u04F1\u04F3\u04F5\u04F7\u04F9\u04FB\u04FD\u04FF\u0501\u0503\u0505\u0507\u0509\u050B\u050D\u050F\u0511\u0513\u0515\u0517\u0519\u051B\u051D\u051F\u0521\u0523\u0525\u0527\u0529\u052B\u052D\u052F\u0561-\u0587\u13F8-\u13FD\u1D00-\u1D2B\u1D6B-\u1D77\u1D79-\u1D9A\u1E01\u1E03\u1E05\u1E07\u1E09\u1E0B\u1E0D\u1E0F\u1E11\u1E13\u1E15\u1E17\u1E19\u1E1B\u1E1D\u1E1F\u1E21\u1E23\u1E25\u1E27\u1E29\u1E2B\u1E2D\u1E2F\u1E31\u1E33\u1E35\u1E37\u1E39\u1E3B\u1E3D\u1E3F\u1E41\u1E43\u1E45\u1E47\u1E49\u1E4B\u1E4D\u1E4F\u1E51\u1E53\u1E55\u1E57\u1E59\u1E5B\u1E5D\u1E5F\u1E61\u1E63\u1E65\u1E67\u1E69\u1E6B\u1E6D\u1E6F\u1E71\u1E73\u1E75\u1E77\u1E79\u1E7B\u1E7D\u1E7F\u1E81\u1E83\u1E85\u1E87\u1E89\u1E8B\u1E8D\u1E8F\u1E91\u1E93\u1E95-\u1E9D\u1E9F\u1EA1\u1EA3\u1EA5\u1EA7\u1EA9\u1EAB\u1EAD\u1EAF\u1EB1\u1EB3\u1EB5\u1EB7\u1EB9\u1EBB\u1EBD\u1EBF\u1EC1\u1EC3\u1EC5\u1EC7\u1EC9\u1ECB\u1ECD\u1ECF\u1ED1\u1ED3\u1ED5\u1ED7\u1ED9\u1EDB\u1EDD\u1EDF\u1EE1\u1EE3\u1EE5\u1EE7\u1EE9\u1EEB\u1EED\u1EEF\u1EF1\u1EF3\u1EF5\u1EF7\u1EF9\u1EFB\u1EFD\u1EFF-\u1F07\u1F10-\u1F15\u1F20-\u1F27\u1F30-\u1F37\u1F40-\u1F45\u1F50-\u1F57\u1F60-\u1F67\u1F70-\u1F7D\u1F80-\u1F87\u1F90-\u1F97\u1FA0-\u1FA7\u1FB0-\u1FB4\u1FB6-\u1FB7\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FC7\u1FD0-\u1FD3\u1FD6-\u1FD7\u1FE0-\u1FE7\u1FF2-\u1FF4\u1FF6-\u1FF7\u210A\u210E-\u210F\u2113\u212F\u2134\u2139\u213C-\u213D\u2146-\u2149\u214E\u2184\u2C30-\u2C5E\u2C61\u2C65-\u2C66\u2C68\u2C6A\u2C6C\u2C71\u2C73-\u2C74\u2C76-\u2C7B\u2C81\u2C83\u2C85\u2C87\u2C89\u2C8B\u2C8D\u2C8F\u2C91\u2C93\u2C95\u2C97\u2C99\u2C9B\u2C9D\u2C9F\u2CA1\u2CA3\u2CA5\u2CA7\u2CA9\u2CAB\u2CAD\u2CAF\u2CB1\u2CB3\u2CB5\u2CB7\u2CB9\u2CBB\u2CBD\u2CBF\u2CC1\u2CC3\u2CC5\u2CC7\u2CC9\u2CCB\u2CCD\u2CCF\u2CD1\u2CD3\u2CD5\u2CD7\u2CD9\u2CDB\u2CDD\u2CDF\u2CE1\u2CE3-\u2CE4\u2CEC\u2CEE\u2CF3\u2D00-\u2D25\u2D27\u2D2D\uA641\uA643\uA645\uA647\uA649\uA64B\uA64D\uA64F\uA651\uA653\uA655\uA657\uA659\uA65B\uA65D\uA65F\uA661\uA663\uA665\uA667\uA669\uA66B\uA66D\uA681\uA683\uA685\uA687\uA689\uA68B\uA68D\uA68F\uA691\uA693\uA695\uA697\uA699\uA69B\uA723\uA725\uA727\uA729\uA72B\uA72D\uA72F-\uA731\uA733\uA735\uA737\uA739\uA73B\uA73D\uA73F\uA741\uA743\uA745\uA747\uA749\uA74B\uA74D\uA74F\uA751\uA753\uA755\uA757\uA759\uA75B\uA75D\uA75F\uA761\uA763\uA765\uA767\uA769\uA76B\uA76D\uA76F\uA771-\uA778\uA77A\uA77C\uA77F\uA781\uA783\uA785\uA787\uA78C\uA78E\uA791\uA793-\uA795\uA797\uA799\uA79B\uA79D\uA79F\uA7A1\uA7A3\uA7A5\uA7A7\uA7A9\uA7B5\uA7B7\uA7FA\uAB30-\uAB5A\uAB60-\uAB65\uAB70-\uABBF\uFB00-\uFB06\uFB13-\uFB17\uFF41-\uFF5A]

// Letter, Modifier
Lm = [\u02B0-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0374\u037A\u0559\u0640\u06E5-\u06E6\u07F4-\u07F5\u07FA\u081A\u0824\u0828\u0971\u0E46\u0EC6\u10FC\u17D7\u1843\u1AA7\u1C78-\u1C7D\u1D2C-\u1D6A\u1D78\u1D9B-\u1DBF\u2071\u207F\u2090-\u209C\u2C7C-\u2C7D\u2D6F\u2E2F\u3005\u3031-\u3035\u303B\u309D-\u309E\u30FC-\u30FE\uA015\uA4F8-\uA4FD\uA60C\uA67F\uA69C-\uA69D\uA717-\uA71F\uA770\uA788\uA7F8-\uA7F9\uA9CF\uA9E6\uAA70\uAADD\uAAF3-\uAAF4\uAB5C-\uAB5F\uFF70\uFF9E-\uFF9F]

// Letter, Other
Lo = [\u00AA\u00BA\u01BB\u01C0-\u01C3\u0294\u05D0-\u05EA\u05F0-\u05F2\u0620-\u063F\u0641-\u064A\u066E-\u066F\u0671-\u06D3\u06D5\u06EE-\u06EF\u06FA-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u07A5\u07B1\u07CA-\u07EA\u0800-\u0815\u0840-\u0858\u08A0-\u08B4\u0904-\u0939\u093D\u0950\u0958-\u0961\u0972-\u0980\u0985-\u098C\u098F-\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2\u09B6-\u09B9\u09BD\u09CE\u09DC-\u09DD\u09DF-\u09E1\u09F0-\u09F1\u0A05-\u0A0A\u0A0F-\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32-\u0A33\u0A35-\u0A36\u0A38-\u0A39\u0A59-\u0A5C\u0A5E\u0A72-\u0A74\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8\u0AAA-\u0AB0\u0AB2-\u0AB3\u0AB5-\u0AB9\u0ABD\u0AD0\u0AE0-\u0AE1\u0AF9\u0B05-\u0B0C\u0B0F-\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32-\u0B33\u0B35-\u0B39\u0B3D\u0B5C-\u0B5D\u0B5F-\u0B61\u0B71\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99-\u0B9A\u0B9C\u0B9E-\u0B9F\u0BA3-\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0BD0\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C39\u0C3D\u0C58-\u0C5A\u0C60-\u0C61\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8\u0CAA-\u0CB3\u0CB5-\u0CB9\u0CBD\u0CDE\u0CE0-\u0CE1\u0CF1-\u0CF2\u0D05-\u0D0C\u0D0E-\u0D10\u0D12-\u0D3A\u0D3D\u0D4E\u0D5F-\u0D61\u0D7A-\u0D7F\u0D85-\u0D96\u0D9A-\u0DB1\u0DB3-\u0DBB\u0DBD\u0DC0-\u0DC6\u0E01-\u0E30\u0E32-\u0E33\u0E40-\u0E45\u0E81-\u0E82\u0E84\u0E87-\u0E88\u0E8A\u0E8D\u0E94-\u0E97\u0E99-\u0E9F\u0EA1-\u0EA3\u0EA5\u0EA7\u0EAA-\u0EAB\u0EAD-\u0EB0\u0EB2-\u0EB3\u0EBD\u0EC0-\u0EC4\u0EDC-\u0EDF\u0F00\u0F40-\u0F47\u0F49-\u0F6C\u0F88-\u0F8C\u1000-\u102A\u103F\u1050-\u1055\u105A-\u105D\u1061\u1065-\u1066\u106E-\u1070\u1075-\u1081\u108E\u10D0-\u10FA\u10FD-\u1248\u124A-\u124D\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D\u1290-\u12B0\u12B2-\u12B5\u12B8-\u12BE\u12C0\u12C2-\u12C5\u12C8-\u12D6\u12D8-\u1310\u1312-\u1315\u1318-\u135A\u1380-\u138F\u1401-\u166C\u166F-\u167F\u1681-\u169A\u16A0-\u16EA\u16F1-\u16F8\u1700-\u170C\u170E-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176C\u176E-\u1770\u1780-\u17B3\u17DC\u1820-\u1842\u1844-\u1877\u1880-\u18A8\u18AA\u18B0-\u18F5\u1900-\u191E\u1950-\u196D\u1970-\u1974\u1980-\u19AB\u19B0-\u19C9\u1A00-\u1A16\u1A20-\u1A54\u1B05-\u1B33\u1B45-\u1B4B\u1B83-\u1BA0\u1BAE-\u1BAF\u1BBA-\u1BE5\u1C00-\u1C23\u1C4D-\u1C4F\u1C5A-\u1C77\u1CE9-\u1CEC\u1CEE-\u1CF1\u1CF5-\u1CF6\u2135-\u2138\u2D30-\u2D67\u2D80-\u2D96\u2DA0-\u2DA6\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE\u2DD0-\u2DD6\u2DD8-\u2DDE\u3006\u303C\u3041-\u3096\u309F\u30A1-\u30FA\u30FF\u3105-\u312D\u3131-\u318E\u31A0-\u31BA\u31F0-\u31FF\u3400-\u4DB5\u4E00-\u9FD5\uA000-\uA014\uA016-\uA48C\uA4D0-\uA4F7\uA500-\uA60B\uA610-\uA61F\uA62A-\uA62B\uA66E\uA6A0-\uA6E5\uA78F\uA7F7\uA7FB-\uA801\uA803-\uA805\uA807-\uA80A\uA80C-\uA822\uA840-\uA873\uA882-\uA8B3\uA8F2-\uA8F7\uA8FB\uA8FD\uA90A-\uA925\uA930-\uA946\uA960-\uA97C\uA984-\uA9B2\uA9E0-\uA9E4\uA9E7-\uA9EF\uA9FA-\uA9FE\uAA00-\uAA28\uAA40-\uAA42\uAA44-\uAA4B\uAA60-\uAA6F\uAA71-\uAA76\uAA7A\uAA7E-\uAAAF\uAAB1\uAAB5-\uAAB6\uAAB9-\uAABD\uAAC0\uAAC2\uAADB-\uAADC\uAAE0-\uAAEA\uAAF2\uAB01-\uAB06\uAB09-\uAB0E\uAB11-\uAB16\uAB20-\uAB26\uAB28-\uAB2E\uABC0-\uABE2\uAC00-\uD7A3\uD7B0-\uD7C6\uD7CB-\uD7FB\uF900-\uFA6D\uFA70-\uFAD9\uFB1D\uFB1F-\uFB28\uFB2A-\uFB36\uFB38-\uFB3C\uFB3E\uFB40-\uFB41\uFB43-\uFB44\uFB46-\uFBB1\uFBD3-\uFD3D\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDFB\uFE70-\uFE74\uFE76-\uFEFC\uFF66-\uFF6F\uFF71-\uFF9D\uFFA0-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC]

// Letter, Titlecase
Lt = [\u01C5\u01C8\u01CB\u01F2\u1F88-\u1F8F\u1F98-\u1F9F\u1FA8-\u1FAF\u1FBC\u1FCC\u1FFC]

// Letter, Uppercase
Lu = [\u0041-\u005A\u00C0-\u00D6\u00D8-\u00DE\u0100\u0102\u0104\u0106\u0108\u010A\u010C\u010E\u0110\u0112\u0114\u0116\u0118\u011A\u011C\u011E\u0120\u0122\u0124\u0126\u0128\u012A\u012C\u012E\u0130\u0132\u0134\u0136\u0139\u013B\u013D\u013F\u0141\u0143\u0145\u0147\u014A\u014C\u014E\u0150\u0152\u0154\u0156\u0158\u015A\u015C\u015E\u0160\u0162\u0164\u0166\u0168\u016A\u016C\u016E\u0170\u0172\u0174\u0176\u0178-\u0179\u017B\u017D\u0181-\u0182\u0184\u0186-\u0187\u0189-\u018B\u018E-\u0191\u0193-\u0194\u0196-\u0198\u019C-\u019D\u019F-\u01A0\u01A2\u01A4\u01A6-\u01A7\u01A9\u01AC\u01AE-\u01AF\u01B1-\u01B3\u01B5\u01B7-\u01B8\u01BC\u01C4\u01C7\u01CA\u01CD\u01CF\u01D1\u01D3\u01D5\u01D7\u01D9\u01DB\u01DE\u01E0\u01E2\u01E4\u01E6\u01E8\u01EA\u01EC\u01EE\u01F1\u01F4\u01F6-\u01F8\u01FA\u01FC\u01FE\u0200\u0202\u0204\u0206\u0208\u020A\u020C\u020E\u0210\u0212\u0214\u0216\u0218\u021A\u021C\u021E\u0220\u0222\u0224\u0226\u0228\u022A\u022C\u022E\u0230\u0232\u023A-\u023B\u023D-\u023E\u0241\u0243-\u0246\u0248\u024A\u024C\u024E\u0370\u0372\u0376\u037F\u0386\u0388-\u038A\u038C\u038E-\u038F\u0391-\u03A1\u03A3-\u03AB\u03CF\u03D2-\u03D4\u03D8\u03DA\u03DC\u03DE\u03E0\u03E2\u03E4\u03E6\u03E8\u03EA\u03EC\u03EE\u03F4\u03F7\u03F9-\u03FA\u03FD-\u042F\u0460\u0462\u0464\u0466\u0468\u046A\u046C\u046E\u0470\u0472\u0474\u0476\u0478\u047A\u047C\u047E\u0480\u048A\u048C\u048E\u0490\u0492\u0494\u0496\u0498\u049A\u049C\u049E\u04A0\u04A2\u04A4\u04A6\u04A8\u04AA\u04AC\u04AE\u04B0\u04B2\u04B4\u04B6\u04B8\u04BA\u04BC\u04BE\u04C0-\u04C1\u04C3\u04C5\u04C7\u04C9\u04CB\u04CD\u04D0\u04D2\u04D4\u04D6\u04D8\u04DA\u04DC\u04DE\u04E0\u04E2\u04E4\u04E6\u04E8\u04EA\u04EC\u04EE\u04F0\u04F2\u04F4\u04F6\u04F8\u04FA\u04FC\u04FE\u0500\u0502\u0504\u0506\u0508\u050A\u050C\u050E\u0510\u0512\u0514\u0516\u0518\u051A\u051C\u051E\u0520\u0522\u0524\u0526\u0528\u052A\u052C\u052E\u0531-\u0556\u10A0-\u10C5\u10C7\u10CD\u13A0-\u13F5\u1E00\u1E02\u1E04\u1E06\u1E08\u1E0A\u1E0C\u1E0E\u1E10\u1E12\u1E14\u1E16\u1E18\u1E1A\u1E1C\u1E1E\u1E20\u1E22\u1E24\u1E26\u1E28\u1E2A\u1E2C\u1E2E\u1E30\u1E32\u1E34\u1E36\u1E38\u1E3A\u1E3C\u1E3E\u1E40\u1E42\u1E44\u1E46\u1E48\u1E4A\u1E4C\u1E4E\u1E50\u1E52\u1E54\u1E56\u1E58\u1E5A\u1E5C\u1E5E\u1E60\u1E62\u1E64\u1E66\u1E68\u1E6A\u1E6C\u1E6E\u1E70\u1E72\u1E74\u1E76\u1E78\u1E7A\u1E7C\u1E7E\u1E80\u1E82\u1E84\u1E86\u1E88\u1E8A\u1E8C\u1E8E\u1E90\u1E92\u1E94\u1E9E\u1EA0\u1EA2\u1EA4\u1EA6\u1EA8\u1EAA\u1EAC\u1EAE\u1EB0\u1EB2\u1EB4\u1EB6\u1EB8\u1EBA\u1EBC\u1EBE\u1EC0\u1EC2\u1EC4\u1EC6\u1EC8\u1ECA\u1ECC\u1ECE\u1ED0\u1ED2\u1ED4\u1ED6\u1ED8\u1EDA\u1EDC\u1EDE\u1EE0\u1EE2\u1EE4\u1EE6\u1EE8\u1EEA\u1EEC\u1EEE\u1EF0\u1EF2\u1EF4\u1EF6\u1EF8\u1EFA\u1EFC\u1EFE\u1F08-\u1F0F\u1F18-\u1F1D\u1F28-\u1F2F\u1F38-\u1F3F\u1F48-\u1F4D\u1F59\u1F5B\u1F5D\u1F5F\u1F68-\u1F6F\u1FB8-\u1FBB\u1FC8-\u1FCB\u1FD8-\u1FDB\u1FE8-\u1FEC\u1FF8-\u1FFB\u2102\u2107\u210B-\u210D\u2110-\u2112\u2115\u2119-\u211D\u2124\u2126\u2128\u212A-\u212D\u2130-\u2133\u213E-\u213F\u2145\u2183\u2C00-\u2C2E\u2C60\u2C62-\u2C64\u2C67\u2C69\u2C6B\u2C6D-\u2C70\u2C72\u2C75\u2C7E-\u2C80\u2C82\u2C84\u2C86\u2C88\u2C8A\u2C8C\u2C8E\u2C90\u2C92\u2C94\u2C96\u2C98\u2C9A\u2C9C\u2C9E\u2CA0\u2CA2\u2CA4\u2CA6\u2CA8\u2CAA\u2CAC\u2CAE\u2CB0\u2CB2\u2CB4\u2CB6\u2CB8\u2CBA\u2CBC\u2CBE\u2CC0\u2CC2\u2CC4\u2CC6\u2CC8\u2CCA\u2CCC\u2CCE\u2CD0\u2CD2\u2CD4\u2CD6\u2CD8\u2CDA\u2CDC\u2CDE\u2CE0\u2CE2\u2CEB\u2CED\u2CF2\uA640\uA642\uA644\uA646\uA648\uA64A\uA64C\uA64E\uA650\uA652\uA654\uA656\uA658\uA65A\uA65C\uA65E\uA660\uA662\uA664\uA666\uA668\uA66A\uA66C\uA680\uA682\uA684\uA686\uA688\uA68A\uA68C\uA68E\uA690\uA692\uA694\uA696\uA698\uA69A\uA722\uA724\uA726\uA728\uA72A\uA72C\uA72E\uA732\uA734\uA736\uA738\uA73A\uA73C\uA73E\uA740\uA742\uA744\uA746\uA748\uA74A\uA74C\uA74E\uA750\uA752\uA754\uA756\uA758\uA75A\uA75C\uA75E\uA760\uA762\uA764\uA766\uA768\uA76A\uA76C\uA76E\uA779\uA77B\uA77D-\uA77E\uA780\uA782\uA784\uA786\uA78B\uA78D\uA790\uA792\uA796\uA798\uA79A\uA79C\uA79E\uA7A0\uA7A2\uA7A4\uA7A6\uA7A8\uA7AA-\uA7AD\uA7B0-\uA7B4\uA7B6\uFF21-\uFF3A]

// Mark, Spacing Combining
Mc = [\u0903\u093B\u093E-\u0940\u0949-\u094C\u094E-\u094F\u0982-\u0983\u09BE-\u09C0\u09C7-\u09C8\u09CB-\u09CC\u09D7\u0A03\u0A3E-\u0A40\u0A83\u0ABE-\u0AC0\u0AC9\u0ACB-\u0ACC\u0B02-\u0B03\u0B3E\u0B40\u0B47-\u0B48\u0B4B-\u0B4C\u0B57\u0BBE-\u0BBF\u0BC1-\u0BC2\u0BC6-\u0BC8\u0BCA-\u0BCC\u0BD7\u0C01-\u0C03\u0C41-\u0C44\u0C82-\u0C83\u0CBE\u0CC0-\u0CC4\u0CC7-\u0CC8\u0CCA-\u0CCB\u0CD5-\u0CD6\u0D02-\u0D03\u0D3E-\u0D40\u0D46-\u0D48\u0D4A-\u0D4C\u0D57\u0D82-\u0D83\u0DCF-\u0DD1\u0DD8-\u0DDF\u0DF2-\u0DF3\u0F3E-\u0F3F\u0F7F\u102B-\u102C\u1031\u1038\u103B-\u103C\u1056-\u1057\u1062-\u1064\u1067-\u106D\u1083-\u1084\u1087-\u108C\u108F\u109A-\u109C\u17B6\u17BE-\u17C5\u17C7-\u17C8\u1923-\u1926\u1929-\u192B\u1930-\u1931\u1933-\u1938\u1A19-\u1A1A\u1A55\u1A57\u1A61\u1A63-\u1A64\u1A6D-\u1A72\u1B04\u1B35\u1B3B\u1B3D-\u1B41\u1B43-\u1B44\u1B82\u1BA1\u1BA6-\u1BA7\u1BAA\u1BE7\u1BEA-\u1BEC\u1BEE\u1BF2-\u1BF3\u1C24-\u1C2B\u1C34-\u1C35\u1CE1\u1CF2-\u1CF3\u302E-\u302F\uA823-\uA824\uA827\uA880-\uA881\uA8B4-\uA8C3\uA952-\uA953\uA983\uA9B4-\uA9B5\uA9BA-\uA9BB\uA9BD-\uA9C0\uAA2F-\uAA30\uAA33-\uAA34\uAA4D\uAA7B\uAA7D\uAAEB\uAAEE-\uAAEF\uAAF5\uABE3-\uABE4\uABE6-\uABE7\uABE9-\uABEA\uABEC]

// Mark, Nonspacing
Mn = [\u0300-\u036F\u0483-\u0487\u0591-\u05BD\u05BF\u05C1-\u05C2\u05C4-\u05C5\u05C7\u0610-\u061A\u064B-\u065F\u0670\u06D6-\u06DC\u06DF-\u06E4\u06E7-\u06E8\u06EA-\u06ED\u0711\u0730-\u074A\u07A6-\u07B0\u07EB-\u07F3\u0816-\u0819\u081B-\u0823\u0825-\u0827\u0829-\u082D\u0859-\u085B\u08E3-\u0902\u093A\u093C\u0941-\u0948\u094D\u0951-\u0957\u0962-\u0963\u0981\u09BC\u09C1-\u09C4\u09CD\u09E2-\u09E3\u0A01-\u0A02\u0A3C\u0A41-\u0A42\u0A47-\u0A48\u0A4B-\u0A4D\u0A51\u0A70-\u0A71\u0A75\u0A81-\u0A82\u0ABC\u0AC1-\u0AC5\u0AC7-\u0AC8\u0ACD\u0AE2-\u0AE3\u0B01\u0B3C\u0B3F\u0B41-\u0B44\u0B4D\u0B56\u0B62-\u0B63\u0B82\u0BC0\u0BCD\u0C00\u0C3E-\u0C40\u0C46-\u0C48\u0C4A-\u0C4D\u0C55-\u0C56\u0C62-\u0C63\u0C81\u0CBC\u0CBF\u0CC6\u0CCC-\u0CCD\u0CE2-\u0CE3\u0D01\u0D41-\u0D44\u0D4D\u0D62-\u0D63\u0DCA\u0DD2-\u0DD4\u0DD6\u0E31\u0E34-\u0E3A\u0E47-\u0E4E\u0EB1\u0EB4-\u0EB9\u0EBB-\u0EBC\u0EC8-\u0ECD\u0F18-\u0F19\u0F35\u0F37\u0F39\u0F71-\u0F7E\u0F80-\u0F84\u0F86-\u0F87\u0F8D-\u0F97\u0F99-\u0FBC\u0FC6\u102D-\u1030\u1032-\u1037\u1039-\u103A\u103D-\u103E\u1058-\u1059\u105E-\u1060\u1071-\u1074\u1082\u1085-\u1086\u108D\u109D\u135D-\u135F\u1712-\u1714\u1732-\u1734\u1752-\u1753\u1772-\u1773\u17B4-\u17B5\u17B7-\u17BD\u17C6\u17C9-\u17D3\u17DD\u180B-\u180D\u18A9\u1920-\u1922\u1927-\u1928\u1932\u1939-\u193B\u1A17-\u1A18\u1A1B\u1A56\u1A58-\u1A5E\u1A60\u1A62\u1A65-\u1A6C\u1A73-\u1A7C\u1A7F\u1AB0-\u1ABD\u1B00-\u1B03\u1B34\u1B36-\u1B3A\u1B3C\u1B42\u1B6B-\u1B73\u1B80-\u1B81\u1BA2-\u1BA5\u1BA8-\u1BA9\u1BAB-\u1BAD\u1BE6\u1BE8-\u1BE9\u1BED\u1BEF-\u1BF1\u1C2C-\u1C33\u1C36-\u1C37\u1CD0-\u1CD2\u1CD4-\u1CE0\u1CE2-\u1CE8\u1CED\u1CF4\u1CF8-\u1CF9\u1DC0-\u1DF5\u1DFC-\u1DFF\u20D0-\u20DC\u20E1\u20E5-\u20F0\u2CEF-\u2CF1\u2D7F\u2DE0-\u2DFF\u302A-\u302D\u3099-\u309A\uA66F\uA674-\uA67D\uA69E-\uA69F\uA6F0-\uA6F1\uA802\uA806\uA80B\uA825-\uA826\uA8C4\uA8E0-\uA8F1\uA926-\uA92D\uA947-\uA951\uA980-\uA982\uA9B3\uA9B6-\uA9B9\uA9BC\uA9E5\uAA29-\uAA2E\uAA31-\uAA32\uAA35-\uAA36\uAA43\uAA4C\uAA7C\uAAB0\uAAB2-\uAAB4\uAAB7-\uAAB8\uAABE-\uAABF\uAAC1\uAAEC-\uAAED\uAAF6\uABE5\uABE8\uABED\uFB1E\uFE00-\uFE0F\uFE20-\uFE2F]

// Number, Decimal Digit
Nd = [\u0030-\u0039\u0660-\u0669\u06F0-\u06F9\u07C0-\u07C9\u0966-\u096F\u09E6-\u09EF\u0A66-\u0A6F\u0AE6-\u0AEF\u0B66-\u0B6F\u0BE6-\u0BEF\u0C66-\u0C6F\u0CE6-\u0CEF\u0D66-\u0D6F\u0DE6-\u0DEF\u0E50-\u0E59\u0ED0-\u0ED9\u0F20-\u0F29\u1040-\u1049\u1090-\u1099\u17E0-\u17E9\u1810-\u1819\u1946-\u194F\u19D0-\u19D9\u1A80-\u1A89\u1A90-\u1A99\u1B50-\u1B59\u1BB0-\u1BB9\u1C40-\u1C49\u1C50-\u1C59\uA620-\uA629\uA8D0-\uA8D9\uA900-\uA909\uA9D0-\uA9D9\uA9F0-\uA9F9\uAA50-\uAA59\uABF0-\uABF9\uFF10-\uFF19]

// Number, Letter
Nl = [\u16EE-\u16F0\u2160-\u2182\u2185-\u2188\u3007\u3021-\u3029\u3038-\u303A\uA6E6-\uA6EF]

// Punctuation, Connector
Pc = [\u005F\u203F-\u2040\u2054\uFE33-\uFE34\uFE4D-\uFE4F\uFF3F]

// Separator, Space
Zs = [\u0020\u00A0\u1680\u2000-\u200A\u202F\u205F\u3000]

// Tokens

BreakToken      = "break"      !IdentifierPart
CaseToken       = "case"       !IdentifierPart
CatchToken      = "catch"      !IdentifierPart
ClassToken      = "class"      !IdentifierPart
ConstToken      = "const"      !IdentifierPart
ContinueToken   = "continue"   !IdentifierPart
DebuggerToken   = "debugger"   !IdentifierPart
DefaultToken    = "default"    !IdentifierPart
DeleteToken     = "delete"     !IdentifierPart
DoToken         = "do"         !IdentifierPart
ElseToken       = "else"       !IdentifierPart
EnumToken       = "enum"       !IdentifierPart
ExportToken     = "export"     !IdentifierPart
ExtendsToken    = "extends"    !IdentifierPart
FalseToken      = "false"      !IdentifierPart
FinallyToken    = "finally"    !IdentifierPart
ForToken        = "for"        !IdentifierPart
FunctionToken   = "function"   !IdentifierPart
GetToken        = "get"        !IdentifierPart
IfToken         = "if"         !IdentifierPart
ImportToken     = "import"     !IdentifierPart
InstanceofToken = "instanceof" !IdentifierPart
InToken         = "in"         !IdentifierPart
NewToken        = "new"        !IdentifierPart
NullToken       = "null"       !IdentifierPart
ReturnToken     = "return"     !IdentifierPart
SetToken        = "set"        !IdentifierPart
SuperToken      = "super"      !IdentifierPart
SwitchToken     = "switch"     !IdentifierPart
ThisToken       = "this"       !IdentifierPart
ThrowToken      = "throw"      !IdentifierPart
TrueToken       = "true"       !IdentifierPart
TryToken        = "try"        !IdentifierPart
TypeofToken     = "typeof"     !IdentifierPart
VarToken        = "var"        !IdentifierPart
VoidToken       = "void"       !IdentifierPart
WhileToken      = "while"      !IdentifierPart
WithToken       = "with"       !IdentifierPart

// Skipped

__
  = (WhiteSpace / LineTerminatorSequence / Comment)*

_
  = (WhiteSpace / MultiLineCommentNoLineTerminator)*

// Automatic Semicolon Insertion

EOS
  = __ ";"
  / _ SingleLineComment? LineTerminatorSequence
  / _ &"}"
  / __ EOF

EOF
  = !.

// ----- A.2 Number Conversions -----

// Irrelevant.

// ----- A.3 Expressions -----

PrimaryExpression
  = ThisToken { return { type: "ThisExpression" }; }
  / Identifier
  / Literal
  / ArrayLiteral
  / "(" __ expression:MultiplicativeExpression __ ")" { return expression; }

ArrayLiteral
  = "[" __ elision:(Elision __)? "]" {
      return {
        type: "ArrayExpression",
        elements: optionalList(extractOptional(elision, 0))
      };
    }

Elision
  = "," commas:(__ ",")* { return filledArray(commas.length + 1, null); }

// Begin operator part

UnaryOperator
  = $DeleteToken
  / $VoidToken
  / $TypeofToken
  / "++"
  / "--"
  / $("+" !"=")
  / $("-" !"=")
  / "~"
  / "!"

UnaryExpression
  = operator:UnaryOperator __ argument:UnaryExpression {
      var type = (operator === "++" || operator === "--")
        ? "UpdateExpression"
        : "UnaryExpression";

      return {
        type: type,
        operator: operator,
        argument: argument,
        prefix: true
      };
    }

MultiplicativeExpression
  = head:UnaryExpression
    tail:(__ MultiplicativeOperator __ UnaryExpression)*
    { return buildBinaryExpression(head, tail); }

MultiplicativeOperator
  = $("*" !"=")
  / $("/" !"=")
  / $("%" !"=")

AdditiveExpression
  = head:MultiplicativeExpression
    tail:(__ AdditiveOperator __ MultiplicativeExpression)*
    { return buildBinaryExpression(head, tail); }

AdditiveOperator
  = $("+" ![+=])
  / $("-" ![-=])

ShiftExpression
  = head:AdditiveExpression
    tail:(__ ShiftOperator __ AdditiveExpression)*
    { return buildBinaryExpression(head, tail); }

ShiftOperator
  = $("<<"  !"=")

RelationalExpression
  = head:ShiftExpression
    tail:(__ RelationalOperator __ ShiftExpression)*
    { return buildBinaryExpression(head, tail); }

RelationalOperator
  = "<="
  / ">="
  / $("<" !"<")
  / $(">" !">")
  / $InstanceofToken
  / $InToken

RelationalExpressionNoIn
  = head:ShiftExpression
    tail:(__ RelationalOperatorNoIn __ ShiftExpression)*
    { return buildBinaryExpression(head, tail); }

RelationalOperatorNoIn
  = "<="
  / ">="
  / $("<" !"<")
  / $(">" !">")
  / $InstanceofToken

EqualityExpression
  = head:RelationalExpression
    tail:(__ EqualityOperator __ RelationalExpression)*
    { return buildBinaryExpression(head, tail); }

EqualityExpressionNoIn
  = head:RelationalExpressionNoIn
    tail:(__ EqualityOperator __ RelationalExpressionNoIn)*
    { return buildBinaryExpression(head, tail); }

EqualityOperator
  = "==="
  / "!=="
  / "=="
  / "!="

BitwiseANDExpression
  = head:EqualityExpression
    tail:(__ BitwiseANDOperator __ EqualityExpression)*
    { return buildBinaryExpression(head, tail); }

BitwiseANDExpressionNoIn
  = head:EqualityExpressionNoIn
    tail:(__ BitwiseANDOperator __ EqualityExpressionNoIn)*
    { return buildBinaryExpression(head, tail); }

BitwiseANDOperator
  = $("&" ![&=])

BitwiseXORExpression
  = head:BitwiseANDExpression
    tail:(__ BitwiseXOROperator __ BitwiseANDExpression)*
    { return buildBinaryExpression(head, tail); }

BitwiseXORExpressionNoIn
  = head:BitwiseANDExpressionNoIn
    tail:(__ BitwiseXOROperator __ BitwiseANDExpressionNoIn)*
    { return buildBinaryExpression(head, tail); }

BitwiseXOROperator
  = $("^" !"=")

BitwiseORExpression
  = head:BitwiseXORExpression
    tail:(__ BitwiseOROperator __ BitwiseXORExpression)*
    { return buildBinaryExpression(head, tail); }

BitwiseORExpressionNoIn
  = head:BitwiseXORExpressionNoIn
    tail:(__ BitwiseOROperator __ BitwiseXORExpressionNoIn)*
    { return buildBinaryExpression(head, tail); }

BitwiseOROperator
  = $("|" ![|=])

// ----- A.4 Statements -----

Block
  = "{" __ body:(StatementList __)? "}" {
      return {
        type: "BlockStatement",
        body: optionalList(extractOptional(body, 0))
      };
    }

Statement
  = Block

StatementList
  = head:Statement tail:(__ Statement)* { return buildList(head, tail, 1); }

IfStatement
  = IfToken __ "(" __ test:MultiplicativeExpression __ ")" __
    consequent:Statement __
    ElseToken __
    alternate:Statement
    {
      return {
        type: "IfStatement",
        test: test,
        consequent: consequent,
        alternate: alternate
      };
    }
  / IfToken __ "(" __ test:MultiplicativeExpression __ ")" __
    consequent:Statement {
      return {
        type: "IfStatement",
        test: test,
        consequent: consequent,
        alternate: null
      };
    }

ForStatement
  = ForToken __
    "(" __
    left:Identifier __
    InToken __
    right:MultiplicativeExpression __
    ")" __
    body:Statement
    {
      return {
        type: "ForInStatement",
        left: left,
        right: right,
        body: body
      };
    }

ContinueStatement
  = ContinueToken EOS {
      return { type: "ContinueStatement", label: null };
    }
  / ContinueToken _ label:Identifier EOS {
      return { type: "ContinueStatement", label: label };
    }

BreakStatement
  = BreakToken EOS {
      return { type: "BreakStatement", label: null };
    }
  / BreakToken _ label:Identifier EOS {
      return { type: "BreakStatement", label: label };
    }

ReturnStatement
  = ReturnToken EOS {
      return { type: "ReturnStatement", argument: null };
    }
  / ReturnToken _ argument:MultiplicativeExpression EOS {
      return { type: "ReturnStatement", argument: argument };
    }

FunctionDeclaration
  = FunctionToken __ id:Identifier __
    "(" __ params:(FormalParameterList __)? ")" __
    "{" __ body:FunctionBody __ "}"
    {
      return {
        type: "FunctionDeclaration",
        id: id,
        params: optionalList(extractOptional(params, 0)),
        body: body
      };
    }

FunctionExpression
  = FunctionToken __ id:(Identifier __)?
    "(" __ params:(FormalParameterList __)? ")" __
    "{" __ body:FunctionBody __ "}"
    {
      return {
        type: "FunctionExpression",
        id: extractOptional(id, 0),
        params: optionalList(extractOptional(params, 0)),
        body: body
      };
    }

FormalParameterList
  = head:Identifier tail:(__ "," __ Identifier)* {
      return buildList(head, tail, 3);
    }

FunctionBody
  = body:SourceElements? {
      return {
        type: "BlockStatement",
        body: optionalList(body)
      };
    }

Program
  = body:SourceElements? {
      return {
        type: "Program",
        body: optionalList(body)
      };
    }

SourceElements
  = head:SourceElement tail:(__ SourceElement)* {
      return buildList(head, tail, 1);
    }

SourceElement
  = Statement
  / FunctionDeclaration