/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2014 by Bart Kiers (original author) and Alexandre Vitorelli (contributor -> ported to CSharp)
 * Copyright (c) 2017-2020 by Ivan Kochurkin (Positive Technologies):
    added ECMAScript 6 support, cleared and transformed to the universal grammar.
 * Copyright (c) 2018 by Juan Alvarez (contributor -> ported to Go)
 * Copyright (c) 2019 by Student Main (contributor -> ES2020)
 *
 * 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.
 */
lexer grammar JavaScriptLexer;

channels { ERROR }

options { superClass=JavaScriptBaseLexer; }

HashBangLine:                   { self.isStartOfFile()}? '#!' ~[\r\n\u2028\u2029]*; // only allowed at start
MultiLineComment:               '/*' .*? '*/'             -> channel(HIDDEN);
SingleLineComment:              '//' ~[\r\n\u2028\u2029]* -> channel(HIDDEN);
RegularExpressionLiteral:       '/' RegularExpressionFirstChar RegularExpressionChar* {self.isRegexPossible()}? '/' IdentifierPart*;

OpenBracket:                    '[';
CloseBracket:                   ']';
OpenParen:                      '(';
CloseParen:                     ')';
OpenBrace:                      '{' {self.processOpenBrace()};
CloseBrace:                     '}' {self.processCloseBrace()};
SemiColon:                      ';';
Comma:                          ',';
Assign:                         '=';
QuestionMark:                   '?';
Colon:                          ':';
Ellipsis:                       '...';
Dot:                            '.';
PlusPlus:                       '++';
MinusMinus:                     '--';
Plus:                           '+';
Minus:                          '-';
BitNot:                         '~';
Not:                            '!';
Multiply:                       '*';
Divide:                         '/';
Modulus:                        '%';
Power:                          '**';
NullCoalesce:                   '??';
Hashtag:                        '#';
RightShiftArithmetic:           '>>';
LeftShiftArithmetic:            '<<';
RightShiftLogical:              '>>>';
LessThan:                       '<';
MoreThan:                       '>';
LessThanEquals:                 '<=';
GreaterThanEquals:              '>=';
Equals_:                        '==';
NotEquals:                      '!=';
IdentityEquals:                 '===';
IdentityNotEquals:              '!==';
BitAnd:                         '&';
BitXOr:                         '^';
BitOr:                          '|';
And:                            '&&';
Or:                             '||';
MultiplyAssign:                 '*=';
DivideAssign:                   '/=';
ModulusAssign:                  '%=';
PlusAssign:                     '+=';
MinusAssign:                    '-=';
LeftShiftArithmeticAssign:      '<<=';
RightShiftArithmeticAssign:     '>>=';
RightShiftLogicalAssign:        '>>>=';
BitAndAssign:                   '&=';
BitXorAssign:                   '^=';
BitOrAssign:                    '|=';
PowerAssign:                    '**=';
ARROW:                          '=>';

/// Null Literals

NullLiteral:                    'null';

/// Boolean Literals

BooleanLiteral:                 'true'
              |                 'false';

/// Numeric Literals

DecimalLiteral:                 DecimalIntegerLiteral '.' [0-9] [0-9_]* ExponentPart?
              |                 '.' [0-9] [0-9_]* ExponentPart?
              |                 DecimalIntegerLiteral ExponentPart?
              ;

/// Numeric Literals

HexIntegerLiteral:              '0' [xX] [0-9a-fA-F] HexDigit*;
OctalIntegerLiteral:            '0' [0-7]+ {not self.isStrictMode()}?;
OctalIntegerLiteral2:           '0' [oO] [0-7] [_0-7]*;
BinaryIntegerLiteral:           '0' [bB] [01] [_01]*;

BigHexIntegerLiteral:           '0' [xX] [0-9a-fA-F] HexDigit* 'n';
BigOctalIntegerLiteral:         '0' [oO] [0-7] [_0-7]* 'n';
BigBinaryIntegerLiteral:        '0' [bB] [01] [_01]* 'n';
BigDecimalIntegerLiteral:       DecimalIntegerLiteral 'n';

/// Keywords

Break:                          'break';
Do:                             'do';
Typeof:                         'typeof';
Else:                           'else';
New:                            'new';
Var:                            'var';
Return:                         'return';
Void:                           'void';
Continue:                       'continue';
For:                            'for';
While:                          'while';
Function:                       'function';
This:                           'this';
Default:                        'default';
If:                             'if';
Delete:                         'delete';
In:                             'in';
As:                             'as';
From:                           'from';

/// Unused words in this project

//Instanceof:                     'instanceof';
//Case:                           'case';
//Catch:                          'catch';
//Finally:                        'finally';
//Switch:                         'switch';
//Debugger:                       'debugger';
//With:                           'with';
//Try:                            'try';
//Throw:                          'throw';

/// Future Reserved Words

Class:                          'class';
Enum:                           'enum';
Extends:                        'extends';
Super:                          'super';
Const:                          'const';
Export:                         'export';
Import:                         'import';

//Async:                          'async';
//Await:                          'await';

/// The following tokens are also considered to be FutureReservedWords
/// when parsing strict mode

Implements:                     'implements' {self.isStrictMode()}?;
StrictLet:                      'let' {self.isStrictMode()}?;
NonStrictLet:                   'let' {not self.isStrictMode()}?;
Private:                        'private' {self.isStrictMode()}?;
Public:                         'public' {self.isStrictMode()}?;
Interface:                      'interface' {self.isStrictMode()}?;
Package:                        'package' {self.isStrictMode()}?;
Protected:                      'protected' {self.isStrictMode()}?;
Static:                         'static' {self.isStrictMode()}?;
//Yield:                          'yield' {self.isStrictMode()}?;

/// Identifier Names and Identifiers

Identifier:                     IdentifierStart IdentifierPart*;
/// String Literals
StringLiteral:                 ('"' DoubleStringCharacter* '"'
             |                  '\'' SingleStringCharacter* '\'') {self.processStringLiteral()}
             ;

// TODO: `${`tmp`}`
//TemplateStringLiteral:          '`' ('\\`' | ~'`')* '`';

WhiteSpaces:                    [\t\u000B\u000C\u0020\u00A0]+ -> channel(HIDDEN);

LineTerminator:                 [\r\n\u2028\u2029] -> channel(HIDDEN);

/// Comments


HtmlComment:                    '<!--' .*? '-->' -> channel(HIDDEN);
CDataComment:                   '<![CDATA[' .*? ']]>' -> channel(HIDDEN);
UnexpectedCharacter:            . -> channel(ERROR);

// Fragment rules

fragment DoubleStringCharacter
    : ~["\\\r\n]
    | '\\' EscapeSequence
    | LineContinuation
    ;

fragment SingleStringCharacter
    : ~['\\\r\n]
    | '\\' EscapeSequence
    | LineContinuation
    ;

fragment EscapeSequence
    : CharacterEscapeSequence
    | '0' // no digit ahead! TODO
    | HexEscapeSequence
    | UnicodeEscapeSequence
    | ExtendedUnicodeEscapeSequence
    ;

fragment CharacterEscapeSequence
    : SingleEscapeCharacter
    | NonEscapeCharacter
    ;

fragment HexEscapeSequence
    : 'x' HexDigit HexDigit
    ;

fragment UnicodeEscapeSequence
    : 'u' HexDigit HexDigit HexDigit HexDigit
    | 'u' '{' HexDigit HexDigit+ '}'
    ;

fragment ExtendedUnicodeEscapeSequence
    : 'u' '{' HexDigit+ '}'
    ;

fragment SingleEscapeCharacter
    : ['"\\bfnrtv]
    ;

fragment NonEscapeCharacter
    : ~['"\\bfnrtv0-9xu\r\n]
    ;

fragment EscapeCharacter
    : SingleEscapeCharacter
    | [0-9]
    | [xu]
    ;

fragment LineContinuation
    : '\\' [\r\n\u2028\u2029]
    ;

fragment HexDigit
    : [_0-9a-fA-F]
    ;

fragment DecimalIntegerLiteral
    : '0'
    | [1-9] [0-9_]*
    ;

fragment ExponentPart
    : [eE] [+-]? [0-9_]+
    ;

fragment IdentifierPart
    : IdentifierStart
    | UnicodeCombiningMark
    | UnicodeDigit
    | UnicodeConnectorPunctuation
    | '\u200C'
    | '\u200D'
    ;

fragment IdentifierStart
    : UnicodeLetter
    | [$_]
    | '\\' UnicodeEscapeSequence
    ;

fragment UnicodeLetter
    : [\u0041-\u005A]
    | [\u0061-\u007A]
    | [\u00AA]
    | [\u00B5]
    | [\u00BA]
    | [\u00C0-\u00D6]
    | [\u00D8-\u00F6]
    | [\u00F8-\u021F]
    | [\u0222-\u0233]
    | [\u0250-\u02AD]
    | [\u02B0-\u02B8]
    | [\u02BB-\u02C1]
    | [\u02D0-\u02D1]
    | [\u02E0-\u02E4]
    | [\u02EE]
    | [\u037A]
    | [\u0386]
    | [\u0388-\u038A]
    | [\u038C]
    | [\u038E-\u03A1]
    | [\u03A3-\u03CE]
    | [\u03D0-\u03D7]
    | [\u03DA-\u03F3]
    | [\u0400-\u0481]
    | [\u048C-\u04C4]
    | [\u04C7-\u04C8]
    | [\u04CB-\u04CC]
    | [\u04D0-\u04F5]
    | [\u04F8-\u04F9]
    | [\u0531-\u0556]
    | [\u0559]
    | [\u0561-\u0587]
    | [\u05D0-\u05EA]
    | [\u05F0-\u05F2]
    | [\u0621-\u063A]
    | [\u0640-\u064A]
    | [\u0671-\u06D3]
    | [\u06D5]
    | [\u06E5-\u06E6]
    | [\u06FA-\u06FC]
    | [\u0710]
    | [\u0712-\u072C]
    | [\u0780-\u07A5]
    | [\u0905-\u0939]
    | [\u093D]
    | [\u0950]
    | [\u0958-\u0961]
    | [\u0985-\u098C]
    | [\u098F-\u0990]
    | [\u0993-\u09A8]
    | [\u09AA-\u09B0]
    | [\u09B2]
    | [\u09B6-\u09B9]
    | [\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-\u0A8B]
    | [\u0A8D]
    | [\u0A8F-\u0A91]
    | [\u0A93-\u0AA8]
    | [\u0AAA-\u0AB0]
    | [\u0AB2-\u0AB3]
    | [\u0AB5-\u0AB9]
    | [\u0ABD]
    | [\u0AD0]
    | [\u0AE0]
    | [\u0B05-\u0B0C]
    | [\u0B0F-\u0B10]
    | [\u0B13-\u0B28]
    | [\u0B2A-\u0B30]
    | [\u0B32-\u0B33]
    | [\u0B36-\u0B39]
    | [\u0B3D]
    | [\u0B5C-\u0B5D]
    | [\u0B5F-\u0B61]
    | [\u0B85-\u0B8A]
    | [\u0B8E-\u0B90]
    | [\u0B92-\u0B95]
    | [\u0B99-\u0B9A]
    | [\u0B9C]
    | [\u0B9E-\u0B9F]
    | [\u0BA3-\u0BA4]
    | [\u0BA8-\u0BAA]
    | [\u0BAE-\u0BB5]
    | [\u0BB7-\u0BB9]
    | [\u0C05-\u0C0C]
    | [\u0C0E-\u0C10]
    | [\u0C12-\u0C28]
    | [\u0C2A-\u0C33]
    | [\u0C35-\u0C39]
    | [\u0C60-\u0C61]
    | [\u0C85-\u0C8C]
    | [\u0C8E-\u0C90]
    | [\u0C92-\u0CA8]
    | [\u0CAA-\u0CB3]
    | [\u0CB5-\u0CB9]
    | [\u0CDE]
    | [\u0CE0-\u0CE1]
    | [\u0D05-\u0D0C]
    | [\u0D0E-\u0D10]
    | [\u0D12-\u0D28]
    | [\u0D2A-\u0D39]
    | [\u0D60-\u0D61]
    | [\u0D85-\u0D96]
    | [\u0D9A-\u0DB1]
    | [\u0DB3-\u0DBB]
    | [\u0DBD]
    | [\u0DC0-\u0DC6]
    | [\u0E01-\u0E30]
    | [\u0E32-\u0E33]
    | [\u0E40-\u0E46]
    | [\u0E81-\u0E82]
    | [\u0E84]
    | [\u0E87-\u0E88]
    | [\u0E8A]
    | [\u0E8D]
    | [\u0E94-\u0E97]
    | [\u0E99-\u0E9F]
    | [\u0EA1-\u0EA3]
    | [\u0EA5]
    | [\u0EA7]
    | [\u0EAA-\u0EAB]
    | [\u0EAD-\u0EB0]
    | [\u0EB2-\u0EB3]
    | [\u0EBD-\u0EC4]
    | [\u0EC6]
    | [\u0EDC-\u0EDD]
    | [\u0F00]
    | [\u0F40-\u0F6A]
    | [\u0F88-\u0F8B]
    | [\u1000-\u1021]
    | [\u1023-\u1027]
    | [\u1029-\u102A]
    | [\u1050-\u1055]
    | [\u10A0-\u10C5]
    | [\u10D0-\u10F6]
    | [\u1100-\u1159]
    | [\u115F-\u11A2]
    | [\u11A8-\u11F9]
    | [\u1200-\u1206]
    | [\u1208-\u1246]
    | [\u1248]
    | [\u124A-\u124D]
    | [\u1250-\u1256]
    | [\u1258]
    | [\u125A-\u125D]
    | [\u1260-\u1286]
    | [\u1288]
    | [\u128A-\u128D]
    | [\u1290-\u12AE]
    | [\u12B0]
    | [\u12B2-\u12B5]
    | [\u12B8-\u12BE]
    | [\u12C0]
    | [\u12C2-\u12C5]
    | [\u12C8-\u12CE]
    | [\u12D0-\u12D6]
    | [\u12D8-\u12EE]
    | [\u12F0-\u130E]
    | [\u1310]
    | [\u1312-\u1315]
    | [\u1318-\u131E]
    | [\u1320-\u1346]
    | [\u1348-\u135A]
    | [\u13A0-\u13B0]
    | [\u13B1-\u13F4]
    | [\u1401-\u1676]
    | [\u1681-\u169A]
    | [\u16A0-\u16EA]
    | [\u1780-\u17B3]
    | [\u1820-\u1877]
    | [\u1880-\u18A8]
    | [\u1E00-\u1E9B]
    | [\u1EA0-\u1EE0]
    | [\u1EE1-\u1EF9]
    | [\u1F00-\u1F15]
    | [\u1F18-\u1F1D]
    | [\u1F20-\u1F39]
    | [\u1F3A-\u1F45]
    | [\u1F48-\u1F4D]
    | [\u1F50-\u1F57]
    | [\u1F59]
    | [\u1F5B]
    | [\u1F5D]
    | [\u1F5F-\u1F7D]
    | [\u1F80-\u1FB4]
    | [\u1FB6-\u1FBC]
    | [\u1FBE]
    | [\u1FC2-\u1FC4]
    | [\u1FC6-\u1FCC]
    | [\u1FD0-\u1FD3]
    | [\u1FD6-\u1FDB]
    | [\u1FE0-\u1FEC]
    | [\u1FF2-\u1FF4]
    | [\u1FF6-\u1FFC]
    | [\u207F]
    | [\u2102]
    | [\u2107]
    | [\u210A-\u2113]
    | [\u2115]
    | [\u2119-\u211D]
    | [\u2124]
    | [\u2126]
    | [\u2128]
    | [\u212A-\u212D]
    | [\u212F-\u2131]
    | [\u2133-\u2139]
    | [\u2160-\u2183]
    | [\u3005-\u3007]
    | [\u3021-\u3029]
    | [\u3031-\u3035]
    | [\u3038-\u303A]
    | [\u3041-\u3094]
    | [\u309D-\u309E]
    | [\u30A1-\u30FA]
    | [\u30FC-\u30FE]
    | [\u3105-\u312C]
    | [\u3131-\u318E]
    | [\u31A0-\u31B7]
    | [\u3400-\u4DBF]
    | [\u4E00-\u9FFF]
    | [\uA000-\uA48C]
    | [\uAC00]
    | [\uD7A3]
    | [\uF900-\uFA2D]
    | [\uFB00-\uFB06]
    | [\uFB13-\uFB17]
    | [\uFB1D]
    | [\uFB1F-\uFB28]
    | [\uFB2A-\uFB36]
    | [\uFB38-\uFB3C]
    | [\uFB3E]
    | [\uFB40-\uFB41]
    | [\uFB43-\uFB44]
    | [\uFB46-\uFBB1]
    | [\uFBD3-\uFD3D]
    | [\uFD50-\uFD8F]
    | [\uFD92-\uFDC7]
    | [\uFDF0-\uFDFB]
    | [\uFE70-\uFE72]
    | [\uFE74]
    | [\uFE76-\uFEFC]
    | [\uFF21-\uFF3A]
    | [\uFF41-\uFF5A]
    | [\uFF66-\uFFBE]
    | [\uFFC2-\uFFC7]
    | [\uFFCA-\uFFCF]
    | [\uFFD2-\uFFD7]
    | [\uFFDA-\uFFDC]
    ;

fragment UnicodeCombiningMark
    : [\u0300-\u034E]
    | [\u0360-\u0362]
    | [\u0483-\u0486]
    | [\u0591-\u05A1]
    | [\u05A3-\u05B9]
    | [\u05BB-\u05BD]
    | [\u05BF]
    | [\u05C1-\u05C2]
    | [\u05C4]
    | [\u064B-\u0655]
    | [\u0670]
    | [\u06D6-\u06DC]
    | [\u06DF-\u06E4]
    | [\u06E7-\u06E8]
    | [\u06EA-\u06ED]
    | [\u0711]
    | [\u0730-\u074A]
    | [\u07A6-\u07B0]
    | [\u0901-\u0903]
    | [\u093C]
    | [\u093E-\u094D]
    | [\u0951-\u0954]
    | [\u0962-\u0963]
    | [\u0981-\u0983]
    | [\u09BC-\u09C4]
    | [\u09C7-\u09C8]
    | [\u09CB-\u09CD]
    | [\u09D7]
    | [\u09E2-\u09E3]
    | [\u0A02]
    | [\u0A3C]
    | [\u0A3E-\u0A42]
    | [\u0A47-\u0A48]
    | [\u0A4B-\u0A4D]
    | [\u0A70-\u0A71]
    | [\u0A81-\u0A83]
    | [\u0ABC]
    | [\u0ABE-\u0AC5]
    | [\u0AC7-\u0AC9]
    | [\u0ACB-\u0ACD]
    | [\u0B01-\u0B03]
    | [\u0B3C]
    | [\u0B3E-\u0B43]
    | [\u0B47-\u0B48]
    | [\u0B4B-\u0B4D]
    | [\u0B56-\u0B57]
    | [\u0B82-\u0B83]
    | [\u0BBE-\u0BC2]
    | [\u0BC6-\u0BC8]
    | [\u0BCA-\u0BCD]
    | [\u0BD7]
    | [\u0C01-\u0C03]
    | [\u0C3E-\u0C44]
    | [\u0C46-\u0C48]
    | [\u0C4A-\u0C4D]
    | [\u0C55-\u0C56]
    | [\u0C82-\u0C83]
    | [\u0CBE-\u0CC4]
    | [\u0CC6-\u0CC8]
    | [\u0CCA-\u0CCD]
    | [\u0CD5-\u0CD6]
    | [\u0D02-\u0D03]
    | [\u0D3E-\u0D43]
    | [\u0D46-\u0D48]
    | [\u0D4A-\u0D4D]
    | [\u0D57]
    | [\u0D82-\u0D83]
    | [\u0DCA]
    | [\u0DCF-\u0DD4]
    | [\u0DD6]
    | [\u0DD8-\u0DDF]
    | [\u0DF2-\u0DF3]
    | [\u0E31]
    | [\u0E34-\u0E3A]
    | [\u0E47-\u0E4E]
    | [\u0EB1]
    | [\u0EB4-\u0EB9]
    | [\u0EBB-\u0EBC]
    | [\u0EC8-\u0ECD]
    | [\u0F18-\u0F19]
    | [\u0F35]
    | [\u0F37]
    | [\u0F39]
    | [\u0F3E-\u0F3F]
    | [\u0F71-\u0F84]
    | [\u0F86-\u0F87]
    | [\u0F90-\u0F97]
    | [\u0F99-\u0FBC]
    | [\u0FC6]
    | [\u102C-\u1032]
    | [\u1036-\u1039]
    | [\u1056-\u1059]
    | [\u17B4-\u17D3]
    | [\u18A9]
    | [\u20D0-\u20DC]
    | [\u20E1]
    | [\u302A-\u302F]
    | [\u3099-\u309A]
    | [\uFB1E]
    | [\uFE20-\uFE23]
    ;

fragment UnicodeDigit
    : [\u0030-\u0039]
    | [\u0660-\u0669]
    | [\u06F0-\u06F9]
    | [\u0966-\u096F]
    | [\u09E6-\u09EF]
    | [\u0A66-\u0A6F]
    | [\u0AE6-\u0AEF]
    | [\u0B66-\u0B6F]
    | [\u0BE7-\u0BEF]
    | [\u0C66-\u0C6F]
    | [\u0CE6-\u0CEF]
    | [\u0D66-\u0D6F]
    | [\u0E50-\u0E59]
    | [\u0ED0-\u0ED9]
    | [\u0F20-\u0F29]
    | [\u1040-\u1049]
    | [\u1369-\u1371]
    | [\u17E0-\u17E9]
    | [\u1810-\u1819]
    | [\uFF10-\uFF19]
    ;

fragment UnicodeConnectorPunctuation
    : [\u005F]
    | [\u203F-\u2040]
    | [\u30FB]
    | [\uFE33-\uFE34]
    | [\uFE4D-\uFE4F]
    | [\uFF3F]
    | [\uFF65]
    ;

fragment RegularExpressionFirstChar
    : ~[*\r\n\u2028\u2029\\/[]
    | RegularExpressionBackslashSequence
    | '[' RegularExpressionClassChar* ']'
    ;

fragment RegularExpressionChar
    : ~[\r\n\u2028\u2029\\/[]
    | RegularExpressionBackslashSequence
    | '[' RegularExpressionClassChar* ']'
    ;

fragment RegularExpressionClassChar
    : ~[\r\n\u2028\u2029\]\\]
    | RegularExpressionBackslashSequence
    ;

fragment RegularExpressionBackslashSequence
    : '\\' ~[\r\n\u2028\u2029]
    ;