Class: RubyRunJs::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/ruby_run_js/jsparser.rb

Constant Summary collapse

Token = 
{
    BooleanLiteral: 1,
    EOF: 2,
    Identifier: 3,
    Keyword: 4,
    NullLiteral: 5,
    NumericLiteral: 6,
    Punctuator: 7,
    StringLiteral: 8
}
TokenName = 
{
    Token[:BooleanLiteral] => 'Boolean',
    Token[:EOF] => '<end>',
    Token[:Identifier] => 'Identifier',
    Token[:Keyword] => 'Keyword',
    Token[:NullLiteral] => 'Null',
    Token[:NumericLiteral] => 'Numeric',
    Token[:Punctuator] => 'Punctuator',
    Token[:StringLiteral] => 'String'
}
Syntax = 
{
    AssignmentExpression: 'AssignmentExpression',
    ArrayExpression: 'ArrayExpression',
    BlockStatement: 'BlockStatement',
    BinaryExpression: 'BinaryExpression',
    BreakStatement: 'BreakStatement',
    CallExpression: 'CallExpression',
    CatchClause: 'CatchClause',
    ConditionalExpression: 'ConditionalExpression',
    ContinueStatement: 'ContinueStatement',
    DoWhileStatement: 'DoWhileStatement',
    DebuggerStatement: 'DebuggerStatement',
    EmptyStatement: 'EmptyStatement',
    ExpressionStatement: 'ExpressionStatement',
    ForStatement: 'ForStatement',
    ForInStatement: 'ForInStatement',
    FunctionDeclaration: 'FunctionDeclaration',
    FunctionExpression: 'FunctionExpression',
    Identifier: 'Identifier',
    IfStatement: 'IfStatement',
    Literal: 'Literal',
    LabeledStatement: 'LabeledStatement',
    LogicalExpression: 'LogicalExpression',
    MemberExpression: 'MemberExpression',
    NewExpression: 'NewExpression',
    ObjectExpression: 'ObjectExpression',
    Program: 'Program',
    Property: 'Property',
    ReturnStatement: 'ReturnStatement',
    SequenceExpression: 'SequenceExpression',
    SwitchStatement: 'SwitchStatement',
    SwitchCase: 'SwitchCase',
    ThisExpression: 'ThisExpression',
    ThrowStatement: 'ThrowStatement',
    TryStatement: 'TryStatement',
    UnaryExpression: 'UnaryExpression',
    UpdateExpression: 'UpdateExpression',
    VariableDeclaration: 'VariableDeclaration',
    VariableDeclarator: 'VariableDeclarator',
    WhileStatement: 'WhileStatement',
    WithStatement: 'WithStatement'
}
PropertyKind = 
{
    Data: 1,
    Get: 2,
    Set: 4
}
Messages =

Error messages should be identical to V8.

{
    UnexpectedToken:  'Unexpected token %0',
    UnexpectedNumber:  'Unexpected number',
    UnexpectedString:  'Unexpected string',
    UnexpectedIdentifier:  'Unexpected identifier',
    UnexpectedReserved:  'Unexpected reserved word',
    UnexpectedEOS:  'Unexpected end of input',
    NewlineAfterThrow:  'Illegal newline after throw',
    InvalidRegExp: 'Invalid regular expression',
    UnterminatedRegExp:  'Invalid regular expression: missing /',
    InvalidLHSInAssignment:  'Invalid left-hand side in assignment',
    InvalidLHSInForIn:  'Invalid left-hand side in for-in',
    MultipleDefaultsInSwitch: 'More than one default clause in switch statement',
    NoCatchOrFinally:  'Missing catch or finally after try',
    UnknownLabel: 'Undefined label \'%0\'',
    Redeclaration: '%0 \'%1\' has already been declared',
    IllegalContinue: 'Illegal continue statement',
    IllegalBreak: 'Illegal break statement',
    IllegalReturn: 'Illegal return statement',
    StrictModeWith:  'Strict mode code may not include a with statement',
    StrictCatchVariable:  'Catch variable may not be eval or arguments in strict mode',
    StrictVarName:  'Variable name may not be eval or arguments in strict mode',
    StrictParamName:  'Parameter name eval or arguments is not allowed in strict mode',
    StrictParamDupe: 'Strict mode function may not have duplicate parameter names',
    StrictFunctionName:  'Function name may not be eval or arguments in strict mode',
    StrictOctalLiteral:  'Octal literals are not allowed in strict mode.',
    StrictDelete:  'Delete of an unqualified identifier in strict mode.',
    StrictDuplicateProperty:  'Duplicate data property in object literal not allowed in strict mode',
    AccessorDataProperty:  'Object literal may not have data and accessor property with the same name',
    AccessorGetSet:  'Object literal may not have multiple get/set accessors with the same name',
    StrictLHSAssignment:  'Assignment to eval or arguments is not allowed in strict mode',
    StrictLHSPostfix:  'Postfix increment/decrement may not have eval or arguments operand in strict mode',
    StrictLHSPrefix:  'Prefix increment/decrement may not have eval or arguments operand in strict mode',
    StrictReservedWord:  'Use of future reserved word in strict mode'
}

Instance Method Summary collapse

Instance Method Details

#addComment(type, value, start, end1, loc) ⇒ Object

The following defs are needed only when the option to preserve the comments is active.



2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
 
# File 'lib/ruby_run_js/jsparser.rb', line 2939

def addComment(type, value, start, end1, loc) 
    assert(start.instance_of? Fixnum, 'Comment must have valid position')

    # Because the way the actual token is scanned, often the comments
    # (if any) are skipped twice during the lexical analysis.
    # Thus, we need to skip adding a comment if the comment array already
    # handled it.
    if (@extra[:comments].length > 0) 
        if (@extra[:comments][@extra[:comments].length - 1][:range][1] > start) 
            return
        end
    end

    @extra[:comments].push({
        type: type,
        value: value,
        range: [start, end1],
        loc: loc
    })
end

#advance ⇒ Object 



934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
 
# File 'lib/ruby_run_js/jsparser.rb', line 934

def advance()
    skipComment()

    if (@index >= @length) 
        return {
            type: Token[:EOF],
            lineNumber: @lineNumber,
            lineStart: @lineStart,
            range: [@index, @index]
        }
    end

    token = scanPunctuator()
    if token != nil
        return token
    end

    ch = @source[@index]

    if (ch == "'" || ch == '"') 
        return scanStringLiteral()
    end

    if (ch == '.' || isDecimalDigit(ch)) 
        return scanNumericLiteral()
    end

    token = scanIdentifier()
    if token != nil
        return token
    end

    throwError(nil, Messages[:UnexpectedToken], 'ILLEGAL')
end

#assert(condition, message) ⇒ Object

Ensure the condition is true, otherwise throw an error. This is only to have a better contract semantic, i. another safety net to catch a logic error. The condition shall be fulfilled in normal case. Do NOT use this to enforce a certain condition on any user input.



124
125
126
127
128
 
# File 'lib/ruby_run_js/jsparser.rb', line 124

def assert(condition, message)
    if (!condition) 
        raise SyntaxError.new 'ASSERT: ' + message
    end
end

#collectRegex ⇒ Object 



3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
 
# File 'lib/ruby_run_js/jsparser.rb', line 3131

def collectRegex() 
    skipComment()

    pos = @index
    loc = {
        start: {
            line: @lineNumber,
            column: @index - @lineStart
        }
    }

    regex = @extra.scanRegExp()
    loc[:end] = {
        line: @lineNumber,
        column: @index - @lineStart
    }

    # Pop the previous token, which is likely '/' or '/='
    if (@extra[:tokens].length > 0) 
        token = @extra[:tokens][@extra[:tokens].length - 1]
        if (token[:range][0] == pos && token[:type] == 'Punctuator') 
            if (token[:value] == '/' || token[:value] == '/=') 
                @extra[:tokens].pop()
            end
        end
    end

    @extra[:tokens].push({
        type: 'RegularExpression',
        value: regex[:literal],
        range: [pos, @index],
        loc: loc
    })

    return regex
end

#collectToken ⇒ Object 



3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
 
# File 'lib/ruby_run_js/jsparser.rb', line 3101

def collectToken() 
    skipComment()
    start = @index
    loc = {
        start: {
            line: @lineNumber,
            column: @index - @lineStart
        }
    }

    token = @extra.advance()
    loc[:end] = {
        line: @lineNumber,
        column: @index - @lineStart
    }

    if (token[:type] != Token[:EOF]) 
        range = [token[:range][0], token[:range][1]]
        value = sliceSource(token[:range][0], token[:range][1])
        @extra[:tokens].push({
            type: TokenName[token[:type]],
            value: value,
            range: range,
            loc: loc
        })
    end

    return token
end

#consumeSemicolon ⇒ Object 



1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
 
# File 'lib/ruby_run_js/jsparser.rb', line 1125

def consumeSemicolon() 
    # Catch the very common case first.
    if (@source[@index] == ';') 
        lex()
        return
    end

    line = @lineNumber
    skipComment()
    if (@lineNumber != line) 
        return
    end

    if (match(';')) 
        lex()
        return
    end

    token = lookahead()
    if (token[:type] != Token[:EOF] && !match('}')) 
        throwUnexpected(token)
    end
end

#createLiteral(token) ⇒ Object 



3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
 
# File 'lib/ruby_run_js/jsparser.rb', line 3189

def createLiteral(token)
    unless @extra[:raw]
        return {
            type: Syntax[:Literal],
            value: token[:value]
        }
    end

    return {
        type: Syntax[:Literal],
        value: token[:value],
        raw: sliceSource(token[:range][0], token[:range][1])
    }
end

#createLocationMarker ⇒ Object 



3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
 
# File 'lib/ruby_run_js/jsparser.rb', line 3204

def createLocationMarker() 
    marker = {}

    marker[:range] = [@index, @index]
    marker[:loc] = {
        start: {
            line: @lineNumber,
            column: @index - @lineStart
        },
        end: {
            line: @lineNumber,
            column: @index - @lineStart
        }
    }

    marker[:end] = lambda {
        this.range[1] = @index
        this[:loc][:end][:line] = @lineNumber
        this[:loc][:end][:column] = @index - @lineStart
    }

    marker[:applyGroup] = lambda do |node| 
        if (@extra[:range]) 
            node[:groupRange] = [this.range[0], this.range[1]]
        end
        if (@extra[:loc]) 
            node[:groupLoc] = {
                start: {
                    line: this[:loc].start[:line],
                    column: this[:loc][:start][:column]
                },
                end: {
                    line: this[:loc].end[:line],
                    column: this[:loc][:end][:column]
                }
            }
        end
    end

    marker[:apply] = lambda do |node| 
        if (@extra[:range]) 
            node[:range] = [this.range[0], this.range[1]]
        end
        if (@extra[:loc]) 
            node[:loc] = {
                start: {
                    line: this[:loc].start[:line],
                    column: this[:loc][:start][:column]
                },
                end: {
                    line: this[:loc].end[:line],
                    column: this[:loc][:end][:column]
                }
            }
        end
    end

    return marker
end

#curCharAndMoveNext ⇒ Object 



234
235
236
237
238
 
# File 'lib/ruby_run_js/jsparser.rb', line 234

def curCharAndMoveNext
    c = @source[@index]
    @index += 1
    c
end

#expect(value) ⇒ Object

Expect the next token to match the specified punctuator. If not, an exception will be thrown.



1071
1072
1073
1074
1075
1076
 
# File 'lib/ruby_run_js/jsparser.rb', line 1071

def expect(value) 
    token = lex()
    if (token[:type] != Token[:Punctuator] || token[:value] != value) 
        throwUnexpected(token)
    end
end

#expectKeyword(keyword) ⇒ Object

Expect the next token to match the specified keyword. If not, an exception will be thrown.



1081
1082
1083
1084
1085
1086
 
# File 'lib/ruby_run_js/jsparser.rb', line 1081

def expectKeyword(keyword) 
    token = lex()
    if (token[:type] != Token[:Keyword] || token[:value] != keyword) 
        throwUnexpected(token)
    end
end

#filterCommentLocation ⇒ Object 



3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
 
# File 'lib/ruby_run_js/jsparser.rb', line 3080

def filterCommentLocation() 
    comments = []

    @extra[:comments].length.times do |i|
        entry = @extra.comments[i]
        comment = {
            type: entry[:type],
            value: entry[:value]
        }
        if (@extra[:range]) 
            comment[:range] = entry[:range]
        end
        if (@extra[:loc]) 
            comment[:loc] = entry[:loc]
        end
        comments.push(comment)
    end

    @extra[:comments] = comments
end

#filterTokenLocation ⇒ Object 



3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
 
# File 'lib/ruby_run_js/jsparser.rb', line 3168

def filterTokenLocation() 
    tokens = []

    @extra[:tokens].length.times do |i|
        entry = @extra[:tokens][i]
        token = {
            type: entry[:type],
            value: entry[:value]
        }
        if (@extra[:range]) 
            token[:range] = entry[:range]
        end
        if (@extra[:loc]) 
            token[:loc] = entry[:loc]
        end
        tokens.push(token)
    end

    @extra[:tokens] = tokens
end

#isDecimalDigit(ch) ⇒ Object 



134
135
136
 
# File 'lib/ruby_run_js/jsparser.rb', line 134

def isDecimalDigit(ch) 
    return ch && '0123456789'.include?(ch)
end

#isFutureReservedWord(id) ⇒ Object

7.6.1.2 Future Reserved Words



180
181
182
 
# File 'lib/ruby_run_js/jsparser.rb', line 180

def isFutureReservedWord(id)
    %w(class enum export extends import super).include? id
end

#isHexDigit(ch) ⇒ Object 



138
139
140
 
# File 'lib/ruby_run_js/jsparser.rb', line 138

def isHexDigit(ch)
    return ch && '0123456789abcdefABCDEF'.include?(ch)
end

#isIdentifierName(token) ⇒ Object 



927
928
929
930
931
932
 
# File 'lib/ruby_run_js/jsparser.rb', line 927

def isIdentifierName(token) 
    return token[:type] == Token[:Identifier] ||
        token[:type] == Token[:Keyword] ||
        token[:type] == Token[:BooleanLiteral] ||
        token[:type] == Token[:NullLiteral]
end

#isIdentifierPart(ch) ⇒ Object 



171
172
173
174
175
176
 
# File 'lib/ruby_run_js/jsparser.rb', line 171

def isIdentifierPart(ch) 
    return (ch == "$") || (ch == "_") || (ch == "\\") ||
        (ch >= "a" && ch <= "z") || (ch >= "A" && ch <= "Z") ||
        ((ch >= "0") && (ch <= "9")) ||
      false#  ((ch.ord() >= 0x80) && NonAsciiIdentifierPart.match?(ch))
end

#isIdentifierStart(ch) ⇒ Object

7.6 Identifier Names and Identifiers



165
166
167
168
169
 
# File 'lib/ruby_run_js/jsparser.rb', line 165

def isIdentifierStart(ch) 
    return (ch == "$") || (ch == "_") || (ch == "\\") ||
        (ch >= "a" && ch <= "z") || (ch >= "A" && ch <= "Z") ||
     false#  ((ch.ord() >= 0x80) && NonAsciiIdentifierStart.match?(ch))
end

#isKeyword(id) ⇒ Object

7.6.1.1 Keywords



194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
 
# File 'lib/ruby_run_js/jsparser.rb', line 194

def isKeyword(id)
    keyword = false
    case id.length
    when 2
        keyword = (id == 'if') || (id == 'in') || (id == 'do')
    when 3
        keyword = (id == 'var') || (id == 'for') || (id == 'new') || (id == 'try')
    when 4
        keyword = (id == 'this') || (id == 'else') || (id == 'case') || (id == 'void') || (id == 'with')
    when 5
        keyword = (id == 'while') || (id == 'break') || (id == 'catch') || (id == 'throw')
    when 6
        keyword = (id == 'return') || (id == 'typeof') || (id == 'delete') || (id == 'switch')
    when 7
        keyword = (id == 'default') || (id == 'finally')
    when 8
        keyword = (id == 'function') || (id == 'continue') || (id == 'debugger')
    when 10
        keyword = (id == 'instanceof')
    end

    return true if keyword

    case id
    # Future reserved words.
    # 'const' is specialized as Keyword in V8.
    when 'const'
        return true
    # For compatiblity to SpiderMonkey and ES[:next]
    when 'yield','let'
        return true
    end

    if (@strict && isStrictModeReservedWord(id)) 
        return true
    end

    return isFutureReservedWord(id)
end

#isLeftHandSide(expr) ⇒ Object

Return true if provided expression is LeftHandSideExpression



1151
1152
1153
 
# File 'lib/ruby_run_js/jsparser.rb', line 1151

def isLeftHandSide(expr) 
    return expr[:type] == Syntax[:Identifier] || expr[:type] == Syntax[:MemberExpression]
end

#isLineTerminator(ch) ⇒ Object

7.3 Line Terminators



159
160
161
 
# File 'lib/ruby_run_js/jsparser.rb', line 159

def isLineTerminator(ch)
    ["\n", "\r" ,"\u2028", "\u2029"].include?(ch)
end

#isOctalDigit(ch) ⇒ Object 



142
143
144
 
# File 'lib/ruby_run_js/jsparser.rb', line 142

def isOctalDigit(ch)
    return ch && '01234567'.include?(ch)
end

#isRestrictedWord(id) ⇒ Object 



188
189
190
 
# File 'lib/ruby_run_js/jsparser.rb', line 188

def isRestrictedWord(id) 
    return id == 'eval' || id == 'arguments'
end

#isStrictModeReservedWord(id) ⇒ Object 



184
185
186
 
# File 'lib/ruby_run_js/jsparser.rb', line 184

def isStrictModeReservedWord(id)
    %w(implements interface package private protected public static yield let).include? id
end

#isWhiteSpace(ch) ⇒ Object

7.2 White Space



149
150
151
152
153
154
155
 
# File 'lib/ruby_run_js/jsparser.rb', line 149

def isWhiteSpace(ch) 
    return false unless ch
    return (ch == " ") || (ch == "\u0009") || (ch == "\u000B") ||
        (ch == "\u000C") || (ch == "\u00A0") ||
        (ch.ord() >= 0x1680 &&
        "\u1680\u180E\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\uFEFF".include?(ch))
end

#lex ⇒ Object 



969
970
971
972
973
974
975
976
977
978
979
980
981
982
 
# File 'lib/ruby_run_js/jsparser.rb', line 969

def lex()

    if (@buffer) 
        @index = @buffer[:range][1]
        @lineNumber = @buffer[:lineNumber]
        @lineStart = @buffer[:lineStart]
        token = @buffer
        @buffer = nil
        return token
    end

    @buffer = nil
    return advance()
end

#lookahead ⇒ Object 



984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
 
# File 'lib/ruby_run_js/jsparser.rb', line 984

def lookahead() 

    if (@buffer != nil) 
        return @buffer
    end

    pos = @index
    line = @lineNumber
    start = @lineStart
    @buffer = advance()
    @index = pos
    @lineNumber = line
    @lineStart = start

    return @buffer
end

#match(value) ⇒ Object

Return true if the next token matches the specified punctuator.



1090
1091
1092
1093
 
# File 'lib/ruby_run_js/jsparser.rb', line 1090

def match(value) 
    token = lookahead()
    return token[:type] == Token[:Punctuator] && token[:value] == value
end

#matchAssign ⇒ Object

Return true if the next token is an assignment operator



1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
 
# File 'lib/ruby_run_js/jsparser.rb', line 1104

def matchAssign() 
    token = lookahead()
    op = token[:value]

    if (token[:type] != Token[:Punctuator]) 
        return false
    end
    return op == '=' ||
        op == '*=' ||
        op == '/=' ||
        op == '%=' ||
        op == '+=' ||
        op == '-=' ||
        op == '<<=' ||
        op == '>>=' ||
        op == '>>>=' ||
        op == '&=' ||
        op == '^=' ||
        op == '|='
end

#matchKeyword(keyword) ⇒ Object

Return true if the next token matches the specified keyword



1097
1098
1099
1100
 
# File 'lib/ruby_run_js/jsparser.rb', line 1097

def matchKeyword(keyword) 
    token = lookahead()
    return token[:type] == Token[:Keyword] && token[:value] == keyword
end

#parse(code, options = nil) ⇒ Object

def filterGroup(node) 

    n = (node.instance_of?(Array)) ? [] : {}
    for (i in node) {
        if (node.hasOwnProperty(i) && i != 'groupRange' && i != 'groupLoc') 
            entry = node[i]
            if (entry == nil || typeof entry != 'object' || entry instanceof RegExp) 
                n[i] = entry
            else
                n[i] = filterGroup(entry)
            end
        end
    end
    return n
end



3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
 
# File 'lib/ruby_run_js/jsparser.rb', line 3368

def parse(code, options = nil)
    @source = code
    @index = 0
    @lineNumber = (@source.length > 0) ? 1 : 0
    @lineStart = 0
    @length = @source.length
    @buffer = nil
    @state = {
        allowIn: true,
        labelSet: {},
        indefBody: false,
        inIteration: false,
        inSwitch: false
    }

    @extra = {}

    @extra[:range] = false
    @extra[:loc] = false
    @extra[:raw] = false

    if (options) 
        @extra[:range] = options[:range] == true
        @extra[:loc] = options[:loc] == true
        @extra[:raw] = options[:raw] = true
        if (options[:tokens]) 
            @extra[:tokens] = []
        end
        if (options[:comment]) 
            @extra[:comments] = []
        end
        if (options[:tolerant]) 
            @extra[:errors] = []
        end
    end

    
    program = parseProgram()

    if (@extra[:comments]) 
        filterCommentLocation()
        program[:comments] = @extra[:comments]
    end
    if (@extra[:tokens]) 
        filterTokenLocation()
        program[:tokens] = @extra[:tokens]
    end
    if (@extra[:errors]) 
        program[:errors] = @extra[:errors]
    end
    if (@extra[:range] || @extra[:loc]) 
 #       program[:body] = filterGroup(program[:body])
    end

    return program
end

#parseAdditiveExpression ⇒ Object

11.6 Additive Operators



1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
 
# File 'lib/ruby_run_js/jsparser.rb', line 1647

def parseAdditiveExpression() 
    expr = parseMultiplicativeExpression()

    while (match('+') || match('-')) 
        expr = {
            type: Syntax[:BinaryExpression],
            operator: lex()[:value],
            left: expr,
            right: parseMultiplicativeExpression()
        }
    end

    return expr
end

#parseArguments ⇒ Object

11.2 Left-Hand-Side Expressions



1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
 
# File 'lib/ruby_run_js/jsparser.rb', line 1419

def parseArguments() 
    args = []

    expect('(')

    if (!match(')')) 
        while (@index < @length) 
            args.push(parseAssignmentExpression())
            if (match(')')) 
                break
            end
            expect(',')
        end
    end

    expect(')')

    return args
end

#parseArrayInitialiser ⇒ Object

11.1.4 Array Initialiser



1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
 
# File 'lib/ruby_run_js/jsparser.rb', line 1157

def parseArrayInitialiser() 
    elements = []

    expect('[')

    while (!match(']')) 
        if (match(',')) 
            lex()
            elements.push(nil)
        else
            elements.push(parseAssignmentExpression())

            if (!match(']')) 
                expect(',')
            end
        end
    end

    expect(']')

    return {
        type: Syntax[:ArrayExpression],
        elements: elements
    }
end

#parseAssignmentExpression ⇒ Object

11.13 Assignment Operators



1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
 
# File 'lib/ruby_run_js/jsparser.rb', line 1827

def parseAssignmentExpression()

    token = lookahead()
    expr = parseConditionalExpression()

    if (matchAssign()) 
        # LeftHandSideExpression
        if (!isLeftHandSide(expr)) 
            throwErrorTolerant(nil, Messages[:InvalidLHSInAssignment])
        end

        # 11.13.1
        if (@strict && expr[:type] == Syntax[:Identifier] && isRestrictedWord(expr[:name])) 
            throwErrorTolerant(token, Messages[:StrictLHSAssignment])
        end

        expr = {
            type: Syntax[:AssignmentExpression],
            operator: lex()[:value],
            left: expr,
            right: parseAssignmentExpression()
        }
    end

    return expr
end

#parseBitwiseANDExpression ⇒ Object

11.10 Binary Bitwise Operators



1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
 
# File 'lib/ruby_run_js/jsparser.rb', line 1718

def parseBitwiseANDExpression() 
    expr = parseEqualityExpression()

    while (match('&')) 
        lex()
        expr = {
            type: Syntax[:BinaryExpression],
            operator: '&',
            left: expr,
            right: parseEqualityExpression()
        }
    end

    return expr
end

#parseBitwiseORExpression ⇒ Object 



1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
 
# File 'lib/ruby_run_js/jsparser.rb', line 1750

def parseBitwiseORExpression() 
    expr = parseBitwiseXORExpression()

    while (match('|')) 
        lex()
        expr = {
            type: Syntax[:BinaryExpression],
            operator: '|',
            left: expr,
            right: parseBitwiseXORExpression()
        }
    end

    return expr
end

#parseBitwiseXORExpression ⇒ Object 



1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
 
# File 'lib/ruby_run_js/jsparser.rb', line 1734

def parseBitwiseXORExpression() 
    expr = parseBitwiseANDExpression()

    while (match('^')) 
        lex()
        expr = {
            type: Syntax[:BinaryExpression],
            operator: '^',
            left: expr,
            right: parseBitwiseANDExpression()
        }
    end

    return expr
end

#parseBlock ⇒ Object 



1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
 
# File 'lib/ruby_run_js/jsparser.rb', line 1897

def parseBlock() 

    expect('{')

    block = parseStatementList()

    expect('}')

    return {
        type: Syntax[:BlockStatement],
        body: block
    }
end

#parseBreakStatement ⇒ Object

12.8 The break @statement



2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
 
# File 'lib/ruby_run_js/jsparser.rb', line 2257

def parseBreakStatement() 
    token = nil
    label = nil

    expectKeyword('break')

    # Optimize the most common form: 'break'.
    if (@source[@index] == ';') 
        lex()

        if (!(@state[:inIteration] || @state[:inSwitch])) 
            throwError(nil, Messages[:IllegalBreak])
        end

        return {
            type: Syntax[:BreakStatement],
            label: nil
        }
    end

    if (peekLineTerminator()) 
        if (!(@state[:inIteration] || @state[:inSwitch])) 
            throwError(nil, Messages[:IllegalBreak])
        end

        return {
            type: Syntax[:BreakStatement],
            label: nil
        }
    end

    token = lookahead()
    if (token[:type] == Token[:Identifier]) 
        label = parseVariableIdentifier()

        if (false) 
            throwError(nil, Messages[:UnknownLabel], label[:name])
        end
    end

    consumeSemicolon()

    if (label == nil && !(@state[:inIteration] || @state[:inSwitch])) 
        throwError(nil, Messages[:IllegalBreak])
    end

    return {
        type: Syntax[:BreakStatement],
        label: label
    }
end

#parseCatchClause ⇒ Object

12.14 The try @statement



2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
 
# File 'lib/ruby_run_js/jsparser.rb', line 2486

def parseCatchClause()

    expectKeyword('catch')

    expect('(')
    if (match(')')) 
        throwUnexpected(lookahead())
    end

    param = parseVariableIdentifier()
    # 12.14.1
    if (@strict && isRestrictedWord(param[:name])) 
        throwErrorTolerant(nil, Messages[:StrictCatchVariable])
    end

    expect(')')

    return {
        type: Syntax[:CatchClause],
        param: param,
        body: parseBlock()
    }
end

#parseComputedMember ⇒ Object 



1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
 
# File 'lib/ruby_run_js/jsparser.rb', line 1458

def parseComputedMember()

    expect('[')

    expr = parseExpression()

    expect(']')

    return expr
end

#parseConditionalExpression ⇒ Object

11.12 Conditional Operator



1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
 
# File 'lib/ruby_run_js/jsparser.rb', line 1802

def parseConditionalExpression()

    expr = parseLogicalORExpression()

    if (match('?')) 
        lex()
        previousAllowIn = @state[:allowIn]
        @state[:allowIn] = true
        consequent = parseAssignmentExpression()
        @state[:allowIn] = previousAllowIn
        expect(':')

        expr = {
            type: Syntax[:ConditionalExpression],
            test: expr,
            consequent: consequent,
            alternate: parseAssignmentExpression()
        }
    end

    return expr
end

#parseConstLetDeclaration(kind) ⇒ Object

kind may be ‘const` or `let` Both are experimental and not in the specification yet. see #wiki[:ecmascript].org/doku.php?id=harmony:const and #wiki[:ecmascript].org/doku.php?id=harmony:let



1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
 
# File 'lib/ruby_run_js/jsparser.rb', line 1982

def parseConstLetDeclaration(kind) 

    expectKeyword(kind)

    declarations = parseVariableDeclarationList(kind)

    consumeSemicolon()

    return {
        type: Syntax[:VariableDeclaration],
        declarations: declarations,
        kind: kind
    }
end

#parseContinueStatement ⇒ Object

12.7 The continue @statement



2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
 
# File 'lib/ruby_run_js/jsparser.rb', line 2203

def parseContinueStatement() 
    token = nil
    label = nil

    expectKeyword('continue')

    # Optimize the most common form: 'continue'.
    if (@source[@index] == ';') 
        lex()

        if (!@state[:inIteration]) 
            throwError(nil, Messages[:IllegalContinue])
        end

        return {
            type: Syntax[:ContinueStatement],
            label: nil
        }
    end

    if (peekLineTerminator()) 
        if (!@state[:inIteration]) 
            throwError(nil, Messages[:IllegalContinue])
        end

        return {
            type: Syntax[:ContinueStatement],
            label: nil
        }
    end

    token = lookahead()
    if (token[:type] == Token[:Identifier]) 
        label = parseVariableIdentifier()

        if (false) 
            throwError(nil, Messages[:UnknownLabel], label[:name])
        end
    end

    consumeSemicolon()

    if (label == nil && !@state[:inIteration]) 
        throwError(nil, Messages[:IllegalContinue])
    end

    return {
        type: Syntax[:ContinueStatement],
        label: label
    }
end

#parseDebuggerStatement ⇒ Object

12.15 The debugger @statement



2542
2543
2544
2545
2546
2547
2548
2549
2550
 
# File 'lib/ruby_run_js/jsparser.rb', line 2542

def parseDebuggerStatement() 
    expectKeyword('debugger')

    consumeSemicolon()

    return {
        type: Syntax[:DebuggerStatement]
    }
end

#parseDoWhileStatement ⇒ Object

12.6 Iteration Statements



2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
 
# File 'lib/ruby_run_js/jsparser.rb', line 2051

def parseDoWhileStatement() 
    expectKeyword('do')

    oldInIteration = @state[:inIteration]
    @state[:inIteration] = true

    body = parseStatement()

    @state[:inIteration] = oldInIteration

    expectKeyword('while')

    expect('(')

    test = parseExpression()

    expect(')')

    if (match(';')) 
        lex()
    end

    return {
        type: Syntax[:DoWhileStatement],
        body: body,
        test: test
    }
end

#parseEmptyStatement ⇒ Object

12.3 Empty Statement



1999
2000
2001
2002
2003
2004
2005
 
# File 'lib/ruby_run_js/jsparser.rb', line 1999

def parseEmptyStatement() 
    expect(';')

    return {
        type: Syntax[:EmptyStatement]
    }
end

#parseEqualityExpression ⇒ Object

11.9 Equality Operators



1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
 
# File 'lib/ruby_run_js/jsparser.rb', line 1701

def parseEqualityExpression() 
    expr = parseRelationalExpression()

    while (match('==') || match('!=') || match('===') || match('!==')) 
        expr = {
            type: Syntax[:BinaryExpression],
            operator: lex()[:value],
            left: expr,
            right: parseRelationalExpression()
        }
    end

    return expr
end

#parseExpression ⇒ Object

11.14 Comma Operator



1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
 
# File 'lib/ruby_run_js/jsparser.rb', line 1856

def parseExpression() 
    expr = parseAssignmentExpression()

    if (match(','))
        expr = {
            type: Syntax[:SequenceExpression],
            expressions: [ expr ]
        }

        while (@index < @length)
            if (!match(','))
                break
            end
            lex()
            expr[:expressions].push(parseAssignmentExpression())
        end

    end
    return expr
end

#parseExpressionStatement ⇒ Object

12.4 Expression Statement



2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
 
# File 'lib/ruby_run_js/jsparser.rb', line 2009

def parseExpressionStatement() 
    expr = parseExpression()

    consumeSemicolon()

    return {
        type: Syntax[:ExpressionStatement],
        expression: expr
    }
end

#parseForStatement ⇒ Object 



2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
 
# File 'lib/ruby_run_js/jsparser.rb', line 2114

def parseForStatement() 
    init = nil
    test = nil
    update = nil
    left = nil

    expectKeyword('for')

    expect('(')

    if (match(';')) 
        lex()
    else
        if (matchKeyword('var') || matchKeyword('let')) 
            @state[:allowIn] = false
            init = parseForVariableDeclaration()
            @state[:allowIn] = true

            if (init[:declarations].length == 1 && matchKeyword('in')) 
                lex()
                left = init
                right = parseExpression()
                init = nil
            end
        else
            @state[:allowIn] = false
            init = parseExpression()
            @state[:allowIn] = true

            if (matchKeyword('in')) 
                # LeftHandSideExpression
                if (!isLeftHandSide(init))
                    throwErrorTolerant(nil, Messages[:InvalidLHSInForIn])
                end

                lex()
                left = init
                right = parseExpression()
                init = nil
            end
        end

        if (left == nil) 
            expect(';')
        end
    end

    if (left == nil) 

        if (!match(';')) 
            test = parseExpression()
        end
        expect(';')

        if (!match(')')) 
            update = parseExpression()
        end
    end

    expect(')')

    oldInIteration = @state[:inIteration]
    @state[:inIteration] = true

    body = parseStatement()

    @state[:inIteration] = oldInIteration

    if (left == nil) 
        return {
            type: Syntax[:ForStatement],
            init: init,
            test: test,
            update: update,
            body: body
        }
    end

    return {
        type: Syntax[:ForInStatement],
        left: left,
        right: right,
        body: body,
        each: false
    }
end

#parseForVariableDeclaration ⇒ Object 



2104
2105
2106
2107
2108
2109
2110
2111
2112
 
# File 'lib/ruby_run_js/jsparser.rb', line 2104

def parseForVariableDeclaration() 
    token = lex()

    return {
        type: Syntax[:VariableDeclaration],
        declarations: parseVariableDeclarationList(),
        kind: token[:value]
    }
end

#parseFunctionDeclaration ⇒ Object 



2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
 
# File 'lib/ruby_run_js/jsparser.rb', line 2701

def parseFunctionDeclaration() 
    params = []

    expectKeyword('function')
    token = lookahead()
    id = parseVariableIdentifier()
    if (@strict) 
        if (isRestrictedWord(token[:value])) 
            throwErrorTolerant(token, Messages[:StrictFunctionName])
        end
    else
        if (isRestrictedWord(token[:value])) 
            firstRestricted = token
            message = Messages[:StrictFunctionName]
        elsif (isStrictModeReservedWord(token[:value])) 
            firstRestricted = token
            message = Messages[:StrictReservedWord]
        end
    end

    expect('(')

    if (!match(')')) 
        paramSet = {}
        while (@index < @length) 
            token = lookahead()
            param = parseVariableIdentifier()
            if (@strict) 
                if (isRestrictedWord(token[:value])) 
                    stricted = token
                    message = Messages[:StrictParamName]
                end
                if (false)
                    stricted = token
                    message = Messages[:StrictParamDupe]
                end
            elsif (!firstRestricted) 
                if (isRestrictedWord(token[:value])) 
                    firstRestricted = token
                    message = Messages[:StrictParamName]
                elsif (isStrictModeReservedWord(token[:value])) 
                    firstRestricted = token
                    message = Messages[:StrictReservedWord]
                elsif (false) 
                    firstRestricted = token
                    message = Messages[:StrictParamDupe]
                end
            end
            params.push(param)
            paramSet[param[:name]] = true
            if (match(')')) 
                break
            end
            expect(',')
        end
    end

    expect(')')

    previousStrict = @strict
    body = parseFunctionSourceElements()
    if (@strict && firstRestricted) 
        throwError(firstRestricted, message)
    end
    if (@strict && stricted) 
        throwErrorTolerant(stricted, message)
    end
    @strict = previousStrict

    return {
        type: Syntax[:FunctionDeclaration],
        id: id,
        params: params,
        defaults: [],
        body: body,
        rest: nil,
        generator: false,
        expression: false
    }
end

#parseFunctionExpression ⇒ Object 



2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
 
# File 'lib/ruby_run_js/jsparser.rb', line 2782

def parseFunctionExpression() 
     id = nil
     params = []

    expectKeyword('function')

    if (!match('(')) 
        token = lookahead()
        id = parseVariableIdentifier()
        if (@strict) 
            if (isRestrictedWord(token[:value])) 
                throwErrorTolerant(token, Messages[:StrictFunctionName])
            end
        else
            if (isRestrictedWord(token[:value])) 
                firstRestricted = token
                message = Messages[:StrictFunctionName]
            elsif (isStrictModeReservedWord(token[:value])) 
                firstRestricted = token
                message = Messages[:StrictReservedWord]
            end
        end
    end

    expect('(')

    if (!match(')')) 
        paramSet = {}
        while (@index < @length) 
            token = lookahead()
            param = parseVariableIdentifier()
            if (@strict) 
                if (isRestrictedWord(token[:value])) 
                    stricted = token
                    message = Messages[:StrictParamName]
                end
                if (false) 
                    stricted = token
                    message = Messages[:StrictParamDupe]
                end
            elsif (!firstRestricted) 
                if (isRestrictedWord(token[:value])) 
                    firstRestricted = token
                    message = Messages[:StrictParamName]
                elsif (isStrictModeReservedWord(token[:value])) 
                    firstRestricted = token
                    message = Messages[:StrictReservedWord]
                elsif (false) 
                    firstRestricted = token
                    message = Messages[:StrictParamDupe]
                end
            end
            params.push(param)
            paramSet[param[:name]] = true
            if (match(')')) 
                break
            end
            expect(',')
        end
    end

    expect(')')

    previousStrict = @strict
    body = parseFunctionSourceElements()
    if (@strict && firstRestricted) 
        throwError(firstRestricted, message)
    end
    if (@strict && stricted) 
        throwErrorTolerant(stricted, message)
    end
    @strict = previousStrict

    return {
        type: Syntax[:FunctionExpression],
        id: id,
        params: params,
        defaults: [],
        body: body,
        rest: nil,
        generator: false,
        expression: false
    }
end

#parseFunctionSourceElements ⇒ Object

13 Function Definition



2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
 
# File 'lib/ruby_run_js/jsparser.rb', line 2636

def parseFunctionSourceElements() 
    sourceElements = []
    firstRestricted = nil

    expect('{')

    while (@index < @length) 
        token = lookahead()
        if (token[:type] != Token[:StringLiteral]) 
            break
        end

        sourceElement = parseSourceElement()
        sourceElements.push(sourceElement)
        if (sourceElement[:expression][:type] != Syntax[:Literal]) 
            # this is not directive
            break
        end
        directive = sliceSource(token[:range][0] + 1, token[:range][1] - 1)
        if (directive == 'use strict') 
            @strict = true
            if (firstRestricted) 
                throwErrorTolerant(firstRestricted, Messages[:StrictOctalLiteral])
            end
        else
            if (!firstRestricted && token[:octal]) 
                firstRestricted = token
            end
        end
    end

    oldLabelSet = @state[:labelSet]
    oldInIteration = @state[:inIteration]
    oldInSwitch = @state[:inSwitch]
    oldIndefBody = @state[:indefBody]

    @state[:labelSet] = {}
    @state[:inIteration] = false
    @state[:inSwitch] = false
    @state[:indefBody] = true

    while (@index < @length) 
        if (match('}')) 
            break
        end
        sourceElement = parseSourceElement()
        if (sourceElement == nil)
            break
        end
        sourceElements.push(sourceElement)
    end

    expect('}')

    @state[:labelSet] = oldLabelSet
    @state[:inIteration] = oldInIteration
    @state[:inSwitch] = oldInSwitch
    @state[:indefBody] = oldIndefBody

    return {
        type: Syntax[:BlockStatement],
        body: sourceElements
    }
end

#parseGroupExpression ⇒ Object

11.1.6 The Grouping Operator



1342
1343
1344
1345
1346
1347
1348
1349
1350
 
# File 'lib/ruby_run_js/jsparser.rb', line 1342

def parseGroupExpression() 
    expect('(')

    expr = parseExpression()

    expect(')')

    return expr
end

#parseIfStatement ⇒ Object

12.5 If @statement



2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
 
# File 'lib/ruby_run_js/jsparser.rb', line 2022

def parseIfStatement()

    expectKeyword('if')

    expect('(')

    test = parseExpression()

    expect(')')

    consequent = parseStatement()

    if (matchKeyword('else')) 
        lex()
        alternate = parseStatement()
    else
        alternate = nil
    end

    return {
        type: Syntax[:IfStatement],
        test: test,
        consequent: consequent,
        alternate: alternate
    }
end

#parseLeftHandSideExpression ⇒ Object 



1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
 
# File 'lib/ruby_run_js/jsparser.rb', line 1517

def parseLeftHandSideExpression() 

    expr = matchKeyword('new') ? parseNewExpression() : parsePrimaryExpression()

    while (match('.') || match('[')) 
        if (match('[')) 
            expr = {
                type: Syntax[:MemberExpression],
                computed: true,
                object: expr,
                property: parseComputedMember()
            }
        else
            expr = {
                type: Syntax[:MemberExpression],
                computed: false,
                object: expr,
                property: parseNonComputedMember()
            }
        end
    end

    return expr
end

#parseLeftHandSideExpressionAllowCall ⇒ Object 



1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
 
# File 'lib/ruby_run_js/jsparser.rb', line 1485

def parseLeftHandSideExpressionAllowCall() 

    expr = matchKeyword('new') ? parseNewExpression() : parsePrimaryExpression()

    while (match('.') || match('[') || match('(')) 
        if (match('(')) 
            expr = {
                type: Syntax[:CallExpression],
                callee: expr,
                arguments: parseArguments()
            }
        elsif (match('[')) 
            expr = {
                type: Syntax[:MemberExpression],
                computed: true,
                object: expr,
                property: parseComputedMember()
            }
        else
            expr = {
                type: Syntax[:MemberExpression],
                computed: false,
                object: expr,
                property: parseNonComputedMember()
            }
        end
    end

    return expr
end

#parseLogicalANDExpression ⇒ Object

11.11 Binary Logical Operators



1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
 
# File 'lib/ruby_run_js/jsparser.rb', line 1768

def parseLogicalANDExpression() 
    expr = parseBitwiseORExpression()

    while (match('&&')) 
        lex()
        expr = {
            type: Syntax[:LogicalExpression],
            operator: '&&',
            left: expr,
            right: parseBitwiseORExpression()
        }
    end

    return expr
end

#parseLogicalORExpression ⇒ Object 



1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
 
# File 'lib/ruby_run_js/jsparser.rb', line 1784

def parseLogicalORExpression() 
    expr = parseLogicalANDExpression()

    while (match('||')) 
        lex()
        expr = {
            type: Syntax[:LogicalExpression],
            operator: '||',
            left: expr,
            right: parseLogicalANDExpression()
        }
    end

    return expr
end

#parseMultiplicativeExpression ⇒ Object

11.5 Multiplicative Operators



1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
 
# File 'lib/ruby_run_js/jsparser.rb', line 1630

def parseMultiplicativeExpression() 
    expr = parseUnaryExpression()

    while (match('*') || match('/') || match('%')) 
        expr = {
            type: Syntax[:BinaryExpression],
            operator: lex()[:value],
            left: expr,
            right: parseUnaryExpression()
        }
    end

    return expr
end

#parseNewExpression ⇒ Object 



1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
 
# File 'lib/ruby_run_js/jsparser.rb', line 1469

def parseNewExpression() 
    expectKeyword('new')

    expr = {
        type: Syntax[:NewExpression],
        callee: parseLeftHandSideExpression(),
        arguments: []
    }

    if (match('(')) 
        expr[:arguments] = parseArguments()
    end

    return expr
end

#parseNonComputedMember ⇒ Object 



1452
1453
1454
1455
1456
 
# File 'lib/ruby_run_js/jsparser.rb', line 1452

def parseNonComputedMember() 
    expect('.')

    return parseNonComputedProperty()
end

#parseNonComputedProperty ⇒ Object 



1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
 
# File 'lib/ruby_run_js/jsparser.rb', line 1439

def parseNonComputedProperty()
    token = lex()

    if (!isIdentifierName(token)) 
        throwUnexpected(token)
    end

    return {
        type: Syntax[:Identifier],
        name: token[:value]
    }
end

#parseObjectInitialiser ⇒ Object 



1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
 
# File 'lib/ruby_run_js/jsparser.rb', line 1291

def parseObjectInitialiser() 
    properties = []
    map = {}

    expect('{')

    while (!match('}')) 
        property = parseObjectProperty()

        if (property[:key][:type] == Syntax[:Identifier]) 
            name = property[:key][:name]
        else
            name = (property[:key][:value]).to_s
        end
        kind = (property[:kind] == 'init') ? PropertyKind[:Data] : (property[:kind] == 'get') ? PropertyKind[:Get] : PropertyKind[:Set]
        if (false)
            if (map[name] == PropertyKind[:Data]) 
                if (@strict && kind == PropertyKind[:Data]) 
                    throwErrorTolerant(nil, Messages[:StrictDuplicateProperty])
                elsif (kind != PropertyKind[:Data]) 
                    throwErrorTolerant(nil, Messages[:AccessorDataProperty])
                end
            else
                if (kind == PropertyKind[:Data]) 
                    throwErrorTolerant(nil, Messages[:AccessorDataProperty])
                elsif (map[name] & kind) 
                    throwErrorTolerant(nil, Messages[:AccessorGetSet])
                end
            end
            map[name] |= kind
        else
            map[name] = kind
        end

        properties.push(property)

        if (!match('}')) 
            expect(',')
        end
    end

    expect('}')

    return {
        type: Syntax[:ObjectExpression],
        properties: properties
    }
end

#parseObjectProperty ⇒ Object 



1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
 
# File 'lib/ruby_run_js/jsparser.rb', line 1225

def parseObjectProperty()

    token = lookahead()

    if (token[:type] == Token[:Identifier]) 

        id = parseObjectPropertyKey()

        # Property Assignment: Getter and Setter.

        if (token[:value] == 'get' && !match(':')) 
            key = parseObjectPropertyKey()
            expect('(')
            expect(')')
            return {
                type: Syntax[:Property],
                key: key,
                value: parsePropertydef([]),
                kind: 'get'
            }
        elsif (token[:value] == 'set' && !match(':')) 
            key = parseObjectPropertyKey()
            expect('(')
            token = lookahead()
            if (token[:type] != Token[:Identifier]) 
                expect(')')
                throwErrorTolerant(token, Messages[:UnexpectedToken], token[:value])
                return {
                    type: Syntax[:Property],
                    key: key,
                    value: parsePropertydef([]),
                    kind: 'set'
                }
            else
                param = [ parseVariableIdentifier() ]
                expect(')')
                return {
                    type: Syntax[:Property],
                    key: key,
                    value: parsePropertydef(param, token),
                    kind: 'set'
                }
            end
        else
            expect(':')
            return {
                type: Syntax[:Property],
                key: id,
                value: parseAssignmentExpression(),
                kind: 'init'
            }
        end
    elsif (token[:type] == Token[:EOF] || token[:type] == Token[:Punctuator]) 
        throwUnexpected(token)
    else
        key = parseObjectPropertyKey()
        expect(':')
        return {
            type: Syntax[:Property],
            key: key,
            value: parseAssignmentExpression(),
            kind: 'init'
        }
    end
end

#parseObjectPropertyKey ⇒ Object 



1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
 
# File 'lib/ruby_run_js/jsparser.rb', line 1206

def parseObjectPropertyKey() 
    token = lex()

    # Note: This def is called only from parseObjectProperty(), where
    # EOF and Punctuator tokens are already filtered out.

    if (token[:type] == Token[:StringLiteral] || token[:type] == Token[:NumericLiteral]) 
        if (@strict && token[:octal]) 
            throwErrorTolerant(token, Messages[:StrictOctalLiteral])
        end
        return createLiteral(token)
    end

    return {
        type: Syntax[:Identifier],
        name: token[:value]
    }
end

#parsePostfixExpression ⇒ Object

11.3 Postfix Expressions



1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
 
# File 'lib/ruby_run_js/jsparser.rb', line 1544

def parsePostfixExpression() 
    expr = parseLeftHandSideExpressionAllowCall()

    token = lookahead()
    if (token[:type] != Token[:Punctuator]) 
        return expr
    end

    if ((match('++') || match('--')) && !peekLineTerminator()) 
        # 11.3.1, 11.3.2
        if (@strict && expr[:type] == Syntax[:Identifier] && isRestrictedWord(expr[:name])) 
            throwErrorTolerant(nil, Messages[:StrictLHSPostfix])
        end
        if (!isLeftHandSide(expr)) 
            throwErrorTolerant(nil, Messages[:InvalidLHSInAssignment])
        end

        expr = {
            type: Syntax[:UpdateExpression],
            operator: lex()[:value],
            argument: expr,
            prefix: false
        }
    end

    return expr
end

#parsePrimaryExpression ⇒ Object

11.1 Primary Expressions



1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
 
# File 'lib/ruby_run_js/jsparser.rb', line 1355

def parsePrimaryExpression() 
    token = lookahead()
    type = token[:type]

    if (type == Token[:Identifier]) 
        return {
            type: Syntax[:Identifier],
            name: lex()[:value]
        }
    end

    if (type == Token[:StringLiteral] || type == Token[:NumericLiteral]) 
        if (@strict && token[:octal])
            throwErrorTolerant(token, Messages[:StrictOctalLiteral])
        end
        return createLiteral(lex())
    end

    if (type == Token[:Keyword]) 
        if (matchKeyword('this')) 
            lex()
            return {
                type: Syntax[:ThisExpression]
            }
        end

        if (matchKeyword('function')) 
            return parseFunctionExpression()
        end
    end

    if (type == Token[:BooleanLiteral]) 
        lex()
        token[:value] = (token[:value] == 'true')
        return createLiteral(token)
    end

    if (type == Token[:NullLiteral]) 
        lex()
        token[:value] = nil
        return createLiteral(token)
    end

    if (match('[')) 
        return parseArrayInitialiser()
    end

    if (match('{')) 
        return parseObjectInitialiser()
    end

    if (match('(')) 
        return parseGroupExpression()
    end

    if (match('/') || match('/=')) 
        return createLiteral(scanRegExp())
    end

    return throwUnexpected(lex())
end

#parseProgram ⇒ Object 



2927
2928
2929
2930
2931
2932
2933
2934
 
# File 'lib/ruby_run_js/jsparser.rb', line 2927

def parseProgram() 
    @strict = false
    program = {
        type: Syntax[:Program],
        body: parseSourceElements()
    }
    return program
end

#parsePropertydef(param, first = nil) ⇒ Object

11.1.5 Object Initialiser



1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
 
# File 'lib/ruby_run_js/jsparser.rb', line 1185

def parsePropertydef(param, first = nil)

    previousStrict = @strict
    body = parseFunctionSourceElements()
    if (first && @strict && isRestrictedWord(param[0][:name])) 
        throwErrorTolerant(first, Messages[:StrictParamName])
    end
    @strict = previousStrict

    return {
        type: Syntax[:FunctionExpression],
        id: nil,
        params: param,
        defaults: [],
        body: body,
        rest: nil,
        generator: false,
        expression: false
    }
end

#parseRelationalExpression ⇒ Object

11.8 Relational Operators



1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
 
# File 'lib/ruby_run_js/jsparser.rb', line 1680

def parseRelationalExpression()
    previousAllowIn = @state[:allowIn]
    @state[:allowIn] = true

    expr = parseShiftExpression()

    while (match('<') || match('>') || match('<=') || match('>=') || (previousAllowIn && matchKeyword('in')) || matchKeyword('instanceof')) 
        expr = {
            type: Syntax[:BinaryExpression],
            operator: lex()[:value],
            left: expr,
            right: parseShiftExpression()
        }
    end

    @state[:allowIn] = previousAllowIn
    return expr
end

#parseReturnStatement ⇒ Object

12.9 The return @statement



2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
 
# File 'lib/ruby_run_js/jsparser.rb', line 2311

def parseReturnStatement() 
    token = nil
    argument = nil

    expectKeyword('return')

    if (!@state[:indefBody]) 
        throwErrorTolerant(nil, Messages[:IllegalReturn])
    end

    # 'return' followed by a space and an identifier is very common.
    if (@source[@index] == ' ') 
        if (isIdentifierStart(@source[@index + 1])) 
            argument = parseExpression()
            consumeSemicolon()
            return {
                type: Syntax[:ReturnStatement],
                argument: argument
            }
        end
    end

    if (peekLineTerminator()) 
        return {
            type: Syntax[:ReturnStatement],
            argument: nil
        }
    end

    if (!match(';')) 
        token = lookahead()
        if (!match('}') && token[:type] != Token[:EOF]) 
            argument = parseExpression()
        end
    end

    consumeSemicolon()

    return {
        type: Syntax[:ReturnStatement],
        argument: argument
    }
end

#parseShiftExpression ⇒ Object

11.7 Bitwise Shift Operators



1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
 
# File 'lib/ruby_run_js/jsparser.rb', line 1664

def parseShiftExpression() 
    expr = parseAdditiveExpression()

    while (match('<<') || match('>>') || match('>>>')) 
        expr = {
            type: Syntax[:BinaryExpression],
            operator: lex()[:value],
            left: expr,
            right: parseAdditiveExpression()
        }
    end

    return expr
end

#parseSourceElement ⇒ Object

14 Program



2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
 
# File 'lib/ruby_run_js/jsparser.rb', line 2869

def parseSourceElement() 
    token = lookahead()

    if (token[:type] == Token[:Keyword]) 
        case (token[:value])
        when 'const','let'
            return parseConstLetDeclaration(token[:value])
        when 'function'
            return parseFunctionDeclaration()
        else
            return parseStatement()
        end
    end

    if (token[:type] != Token[:EOF]) 
        return parseStatement()
    end
end

#parseSourceElements ⇒ Object 



2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
 
# File 'lib/ruby_run_js/jsparser.rb', line 2888

def parseSourceElements() 
    sourceElements = []
    firstRestricted = nil

    while (@index < @length) 
        token = lookahead()
        if (token[:type] != Token[:StringLiteral]) 
            break
        end

        sourceElement = parseSourceElement()
        sourceElements.push(sourceElement)
        if (sourceElement[:expression][:type] != Syntax[:Literal]) 
            # this is not directive
            break
        end
        directive = sliceSource(token[:range][0] + 1, token[:range][1] - 1)
        if (directive == 'use strict') 
            @strict = true
            if (firstRestricted) 
                throwErrorTolerant(firstRestricted, Messages[:StrictOctalLiteral])
            end
        else
            if (!firstRestricted && token[:octal]) 
                firstRestricted = token
            end
        end
    end

    while (@index < @length) 
        sourceElement = parseSourceElement()
        if (sourceElement == nil) 
            break
        end
        sourceElements.push(sourceElement)
    end
    return sourceElements
end

#parseStatement ⇒ Object

12 Statements



2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
 
# File 'lib/ruby_run_js/jsparser.rb', line 2554

def parseStatement() 
    token = lookahead()

    if (token[:type] == Token[:EOF]) 
        throwUnexpected(token)
    end

    if (token[:type] == Token[:Punctuator]) 
        case token[:value]
        when ';'
            return parseEmptyStatement()
        when '{'
            return parseBlock()
        when '('
            return parseExpressionStatement()
        end
    end

    if (token[:type] == Token[:Keyword]) 
        case token[:value]
        when 'break'
            return parseBreakStatement()
        when 'continue'
            return parseContinueStatement()
        when 'debugger'
            return parseDebuggerStatement()
        when 'do'
            return parseDoWhileStatement()
        when 'for'
            return parseForStatement()
        when 'function'
            return parseFunctionDeclaration()
        when 'if'
            return parseIfStatement()
        when 'return'
            return parseReturnStatement()
        when 'switch'
            return parseSwitchStatement()
        when 'throw'
            return parseThrowStatement()
        when 'try'
            return parseTryStatement()
        when 'var'
            return parseVariableStatement()
        when 'while'
            return parseWhileStatement()
        when 'with'
            return parseWithStatement()
        end
    end

    expr = parseExpression()

    # 12.12 Labelled Statements
    if ((expr[:type] == Syntax[:Identifier]) && match(':')) 
        lex()

        if (false) 
            throwError(nil, Messages[:Redeclaration], 'Label', expr[:name])
        end

        @state[:labelSet][expr[:name]] = true
        labeledBody = parseStatement()
        @state[:labelSet].delete(expr[:name])

        return {
            type: Syntax[:LabeledStatement],
            label: expr,
            body: labeledBody
        }
    end

    consumeSemicolon()

    return {
        type: Syntax[:ExpressionStatement],
        expression: expr
    }
end

#parseStatementList ⇒ Object

12.1 Block



1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
 
# File 'lib/ruby_run_js/jsparser.rb', line 1879

def parseStatementList()
    list = []
    statement = nil

    while (@index < @length)
        if (match('}'))
            break
        end
        statement = parseSourceElement()
        unless (statement)
            break
        end
        list.push(statement)
    end

    return list
end

#parseSwitchCase ⇒ Object

12.10 The swith @statement



2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
 
# File 'lib/ruby_run_js/jsparser.rb', line 2381

def parseSwitchCase() 
    consequent = []
    statement = nil

    if (matchKeyword('default')) 
        lex()
        test = nil
    else
        expectKeyword('case')
        test = parseExpression()
    end
    expect(':')

    while (@index < @length) 
        if (match('}') || matchKeyword('default') || matchKeyword('case')) 
            break
        end
        statement = parseStatement()
        if (statement == nil) 
            break
        end
        consequent.push(statement)
    end

    return {
        type: Syntax[:SwitchCase],
        test: test,
        consequent: consequent
    }
end

#parseSwitchStatement ⇒ Object 



2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
 
# File 'lib/ruby_run_js/jsparser.rb', line 2412

def parseSwitchStatement()

    expectKeyword('switch')

    expect('(')

    discriminant = parseExpression()

    expect(')')

    expect('{')

    cases = []

    if (match('}')) 
        lex()
        return {
            type: Syntax[:SwitchStatement],
            discriminant: discriminant,
            cases: cases
        }
    end

    oldInSwitch = @state[:inSwitch]
    @state[:inSwitch] = true
    defaultFound = false

    while (@index < @length) 
        if (match('}')) 
            break
        end
        clause = parseSwitchCase()
        if (clause[:test] == nil) 
            if (defaultFound) 
                throwError(nil, Messages[:MultipleDefaultsInSwitch])
            end
            defaultFound = true
        end
        cases.push(clause)
    end

    @state[:inSwitch] = oldInSwitch

    expect('}')

    return {
        type: Syntax[:SwitchStatement],
        discriminant: discriminant,
        cases: cases
    }
end

#parseThrowStatement ⇒ Object

12.13 The throw @statement



2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
 
# File 'lib/ruby_run_js/jsparser.rb', line 2466

def parseThrowStatement()

    expectKeyword('throw')

    if (peekLineTerminator()) 
        throwError(nil, Messages[:NewlineAfterThrow])
    end

    argument = parseExpression()

    consumeSemicolon()

    return {
        type: Syntax[:ThrowStatement],
        argument: argument
    }
end

#parseTryStatement ⇒ Object 



2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
 
# File 'lib/ruby_run_js/jsparser.rb', line 2510

def parseTryStatement() 
    handlers = []
    finalizer = nil

    expectKeyword('try')

    block = parseBlock()

    if (matchKeyword('catch')) 
        handlers.push(parseCatchClause())
    end

    if (matchKeyword('finally')) 
        lex()
        finalizer = parseBlock()
    end

    if (handlers.length == 0 && !finalizer) 
        throwError(nil, Messages[:NoCatchOrFinally])
    end

    return {
        type: Syntax[:TryStatement],
        block: block,
        guardedHandlers: [],
        handlers: handlers,
        finalizer: finalizer
    }
end

#parseUnaryExpression ⇒ Object

11.4 Unary Operators



1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
 
# File 'lib/ruby_run_js/jsparser.rb', line 1574

def parseUnaryExpression()

    token = lookahead()
    if (token[:type] != Token[:Punctuator] && token[:type] != Token[:Keyword]) 
        return parsePostfixExpression()
    end

    if (match('++') || match('--')) 
        token = lex()
        expr = parseUnaryExpression()
        # 11.4.4, 11.4.5
        if (@strict && expr[:type] == Syntax[:Identifier] && isRestrictedWord(expr[:name])) 
            throwErrorTolerant(nil, Messages[:StrictLHSPrefix])
        end

        if (!isLeftHandSide(expr))
            throwErrorTolerant(nil, Messages[:InvalidLHSInAssignment])
        end

        expr = {
            type: Syntax[:UpdateExpression],
            operator: token[:value],
            argument: expr,
            prefix: true
        }
        return expr
    end

    if (match('+') || match('-') || match('~') || match('!')) 
        expr = {
            type: Syntax[:UnaryExpression],
            operator: lex()[:value],
            argument: parseUnaryExpression(),
            prefix: true
        }
        return expr
    end

    if (matchKeyword('delete') || matchKeyword('void') || matchKeyword('typeof')) 
        expr = {
            type: Syntax[:UnaryExpression],
            operator: lex()[:value],
            argument: parseUnaryExpression(),
            prefix: true
        }
        if (@strict && expr[:operator] == 'delete' && expr[:argument][:type] == Syntax[:Identifier]) 
            throwErrorTolerant(nil, Messages[:StrictDelete])
        end
        return expr
    end

    return parsePostfixExpression()
end

#parseVariableDeclaration(kind = nil) ⇒ Object 



1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
 
# File 'lib/ruby_run_js/jsparser.rb', line 1926

def parseVariableDeclaration(kind=nil) 
    id = parseVariableIdentifier()
    init = nil

    # 12.2.1
    if (@strict && isRestrictedWord(id[:name])) 
        throwErrorTolerant(nil, Messages[:StrictVarName])
    end

    if (kind == 'const') 
        expect('=')
        init = parseAssignmentExpression()
    elsif (match('=')) 
        lex()
        init = parseAssignmentExpression()
    end

    return {
        type: Syntax[:VariableDeclarator],
        id: id,
        init: init
    }
end

#parseVariableDeclarationList(kind = nil) ⇒ Object 



1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
 
# File 'lib/ruby_run_js/jsparser.rb', line 1950

def parseVariableDeclarationList(kind = nil) 
    list = []

    begin
        list.push(parseVariableDeclaration(kind))
        if (!match(',')) 
            break
        end
        lex()
    end while (@index < @length)

    return list
end

#parseVariableIdentifier ⇒ Object

12.2 Variable Statement



1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
 
# File 'lib/ruby_run_js/jsparser.rb', line 1913

def parseVariableIdentifier() 
    token = lex()

    if (token[:type] != Token[:Identifier])
        throwUnexpected(token)
    end

    return {
        type: Syntax[:Identifier],
        name: token[:value]
    }
end

#parseVariableStatement ⇒ Object 



1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
 
# File 'lib/ruby_run_js/jsparser.rb', line 1964

def parseVariableStatement()
    expectKeyword('var')

    declarations = parseVariableDeclarationList()

    consumeSemicolon()

    return {
        type: Syntax[:VariableDeclaration],
        declarations: declarations,
        kind: 'var'
    }
end

#parseWhileStatement ⇒ Object 



2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
 
# File 'lib/ruby_run_js/jsparser.rb', line 2080

def parseWhileStatement()

    expectKeyword('while')

    expect('(')

    test = parseExpression()

    expect(')')

    oldInIteration = @state[:inIteration]
    @state[:inIteration] = true

    body = parseStatement()

    @state[:inIteration] = oldInIteration

    return {
        type: Syntax[:WhileStatement],
        test: test,
        body: body
    }
end

#parseWithStatement ⇒ Object

12.10 The with @statement



2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
 
# File 'lib/ruby_run_js/jsparser.rb', line 2357

def parseWithStatement() 
    if (@strict) 
        throwErrorTolerant(nil, Messages[:StrictModeWith])
    end

    expectKeyword('with')

    expect('(')

    object = parseExpression()

    expect(')')

    body = parseStatement()

    return {
        type: Syntax[:WithStatement],
        object: object,
        body: body
    }
end

#peekLineTerminator ⇒ Object

Return true if there is a line terminator before the next token.



1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
 
# File 'lib/ruby_run_js/jsparser.rb', line 1003

def peekLineTerminator() 
    pos = @index
    line = @lineNumber
    start = @lineStart
    skipComment()
    found = @lineNumber != line
    @index = pos
    @lineNumber = line
    @lineStart = start
    return found
end

#scanComment ⇒ Object 



2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
 
# File 'lib/ruby_run_js/jsparser.rb', line 2960

def scanComment() 
    comment = ''
    blockComment = false
    lineComment = false

    while (@index < @length) 
        ch = @source[@index]

        if (lineComment) 
            ch = curCharAndMoveNext
            if (isLineTerminator(ch)) 
                loc[:end] = {
                    line: @lineNumber,
                    column: @index - @lineStart - 1
                }
                lineComment = false
                addComment('Line', comment, start, @index - 1, loc)
                if (ch == "\r" && @source[@index] == "\n") 
                    @index += 1
                end
                @lineNumber += 1
                @lineStart = @index
                comment = ''
            elsif (@index >= @length) 
                lineComment = false
                comment += ch
                loc[:end] = {
                    line: @lineNumber,
                    column: @length - @lineStart
                }
                addComment('Line', comment, start, @length, loc)
            else
                comment += ch
            end
        elsif (blockComment) 
            if (isLineTerminator(ch)) 
                if (ch == "\r" && @source[@index + 1] == "\n") 
                    @index += 1
                    comment += "\r\n"
                else
                    comment += ch
                end
                @lineNumber += 1
                @index += 1
                @lineStart = @index
                if (@index >= @length)
                    throwError(nil, Messages[:UnexpectedToken], 'ILLEGAL')
                end
            else
                ch = curCharAndMoveNext
                if (@index >= @length) 
                    throwError(nil, Messages[:UnexpectedToken], 'ILLEGAL')
                end
                comment += ch
                if (ch == '*') 
                    ch = @source[@index]
                    if (ch == '/') 
                        comment = comment.substr(0, comment.length - 1)
                        blockComment = false
                        @index += 1
                        loc[:end] = {
                            line: @lineNumber,
                            column: @index - @lineStart
                        }
                        addComment('Block', comment, start, @index, loc)
                        comment = ''
                    end
                end
            end
        elsif (ch == '/') 
            ch = @source[@index + 1]
            if (ch == '/') 
                loc = {
                    start: {
                        line: @lineNumber,
                        column: @index - @lineStart
                    }
                }
                start = @index
                @index += 2
                lineComment = true
                if (@index >= @length) 
                    loc[:end] = {
                        line: @lineNumber,
                        column: @index - @lineStart
                    }
                    lineComment = false
                    addComment('Line', comment, start, @index, loc)
                end
            elsif (ch == '*') 
                start = @index
                @index += 2
                blockComment = true
                loc = {
                    start: {
                        line: @lineNumber,
                        column: @index - @lineStart - 2
                    }
                }
                if (@index >= @length) 
                    throwError(nil, Messages[:UnexpectedToken], 'ILLEGAL')
                end
            else
                break
            end
        elsif (isWhiteSpace(ch)) 
            @index += 1
        elsif (isLineTerminator(ch)) 
            @index += 1
            if (ch ==  "\r" && @source[@index] == "\n") 
                @index += 1
            end
            @lineNumber += 1
            @lineStart = @index
        else
            break
        end
    end
end

#scanHexEscape(prefix) ⇒ Object 



313
314
315
316
317
318
319
320
321
322
323
324
325
326
 
# File 'lib/ruby_run_js/jsparser.rb', line 313

def scanHexEscape(prefix) 
    code = 0

    len = (prefix == 'u') ? 4 : 2
    len.times do |i|
        if (@index < @length && isHexDigit(@source[@index])) 
            ch = curCharAndMoveNext
            code = code * 16 + '0123456789abcdef'.index(ch.downcase())
        else
            return nil
        end
    end
    return [code].pack('U*')
end

#scanIdentifier ⇒ Object 



328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
 
# File 'lib/ruby_run_js/jsparser.rb', line 328

def scanIdentifier()

    ch = @source[@index]
    if (!isIdentifierStart(ch)) 
        return
    end

    start = @index
    if (ch == "\\") 
        @index += 1
        if (@source[@index] != 'u') 
            return
        end
        @index += 1
        restore = @index
        ch = scanHexEscape('u')
        if (ch) 
            if (ch == "\\" || !isIdentifierStart(ch)) 
                return
            end
            id = ch
        else
            @index = restore
            id = 'u'
        end
    else
        id = curCharAndMoveNext
    end

    while (@index < @length) do
        ch = @source[@index]
        if (!isIdentifierPart(ch)) 
            break
        end
        if (ch == "\\") 
            @index += 1
            if (@source[@index] != 'u') 
                return
            end
            @index += 1
            restore = @index
            ch = scanHexEscape('u')
            if (ch) 
                if (ch == "\\" || !isIdentifierPart(ch)) 
                    return
                end
                id += ch
            else
                @index = restore
                id += 'u'
            end
        else
            id += curCharAndMoveNext
        end
    end

    # There is no keyword or literal with only one character.
    # Thus, it must be an identifier.
    if (id.length == 1) 
        return {
            type: Token[:Identifier],
            value: id,
            lineNumber: @lineNumber,
            lineStart: @lineStart,
            range: [start, @index]
        }
    end

    if (isKeyword(id)) 
        return {
            type: Token[:Keyword],
            value: id,
            lineNumber: @lineNumber,
            lineStart: @lineStart,
            range: [start, @index]
        }
    end


    # 7.8.1 Null Literals

    if (id == 'null') 
        return {
            type: Token[:NullLiteral],
            value: id,
            lineNumber: @lineNumber,
            lineStart: @lineStart,
            range: [start, @index]
        }
    end

    # 7.8.2 Boolean Literals

    if (id == 'true' || id == 'false') 
        return {
            type: Token[:BooleanLiteral],
            value: id,
            lineNumber: @lineNumber,
            lineStart: @lineStart,
            range: [start, @index]
        }
    end

    return {
        type: Token[:Identifier],
        value: id,
        lineNumber: @lineNumber,
        lineStart: @lineStart,
        range: [start, @index]
    }
end

#scanNumericLiteral ⇒ Object

7.8.3 Numeric Literals



605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
 
# File 'lib/ruby_run_js/jsparser.rb', line 605

def scanNumericLiteral()

    ch = @source[@index]
    assert(isDecimalDigit(ch) || (ch == '.'),
        'Numeric literal must start with a decimal digit or a decimal point')

    start = @index
    number = ''
    if (ch != '.') 
        number = curCharAndMoveNext
        ch = @source[@index]

        # Hex number starts with '0x'.
        # Octal number starts with '0'.
        if (number == '0') 
            if (ch == 'x' || ch == 'X') 
                number += curCharAndMoveNext
                while (@index < @length) 
                    ch = @source[@index]
                    if (!isHexDigit(ch)) 
                        break
                    end
                    number += curCharAndMoveNext
                end

                if (number.length <= 2) 
                    # only 0x
                    throwError(nil, Messages[:UnexpectedToken], 'ILLEGAL')
                end

                if (@index < @length) 
                    ch = @source[@index]
                    if (isIdentifierStart(ch)) 
                        throwError(nil, Messages[:UnexpectedToken], 'ILLEGAL')
                    end
                end
                return {
                    type: Token[:NumericLiteral],
                    value: number.to_i(16),
                    lineNumber: @lineNumber,
                    lineStart: @lineStart,
                    range: [start, @index]
                }
            elsif (isOctalDigit(ch)) 
                number += curCharAndMoveNext
                while (@index < @length) 
                    ch = @source[@index]
                    if (!isOctalDigit(ch)) 
                        break
                    end
                    number += curCharAndMoveNext
                end

                if (@index < @length) 
                    ch = @source[@index]
                    if (isIdentifierStart(ch) || isDecimalDigit(ch)) 
                        throwError(nil, Messages[:UnexpectedToken], 'ILLEGAL')
                    end
                end
                return {
                    type: Token[:NumericLiteral],
                    value: number.to_i(8),
                    octal: true,
                    lineNumber: @lineNumber,
                    lineStart: @lineStart,
                    range: [start, @index]
                }
            end

            # decimal number starts with '0' such as '09' is illegal.
            if (isDecimalDigit(ch)) 
                throwError(nil, Messages[:UnexpectedToken], 'ILLEGAL')
            end
        end

        while (@index < @length) 
            ch = @source[@index]
            if (!isDecimalDigit(ch)) 
                break
            end
            number += curCharAndMoveNext
        end
    end

    if (ch == '.') 
        number += curCharAndMoveNext
        while (@index < @length) 
            ch = @source[@index]
            if (!isDecimalDigit(ch)) 
                break
            end
            number += curCharAndMoveNext
        end
    end

    if (ch == 'e' || ch == 'E') 
        number += curCharAndMoveNext

        ch = @source[@index]
        if (ch == '+' || ch == '-') 
            number += curCharAndMoveNext
        end

        ch = @source[@index]
        if (isDecimalDigit(ch)) 
            number += curCharAndMoveNext
            while (@index < @length) 
                ch = @source[@index]
                if (!isDecimalDigit(ch)) 
                    break
                end
                number += curCharAndMoveNext
            end
        else
            throwError(nil, Messages[:UnexpectedToken], 'ILLEGAL')
        end
    end

    if (@index < @length) 
        ch = @source[@index]
        if (isIdentifierStart(ch)) 
            throwError(nil, Messages[:UnexpectedToken], 'ILLEGAL')
        end
    end

    return {
        type: Token[:NumericLiteral],
        value: number.to_f,
        lineNumber: @lineNumber,
        lineStart: @lineStart,
        range: [start, @index]
    }
end

#scanPunctuator ⇒ Object

7.7 Punctuators



442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
 
# File 'lib/ruby_run_js/jsparser.rb', line 442

def scanPunctuator() 
    start = @index
    ch1 = @source[@index]

    # Check for most common single-character punctuators.

    if (ch1 == ';' || ch1 == '{' || ch1 == '}') 
        @index += 1
        return {
            type: Token[:Punctuator],
            value: ch1,
            lineNumber: @lineNumber,
            lineStart: @lineStart,
            range: [start, @index]
        }
    end

    if (ch1 == ',' || ch1 == '(' || ch1 == ')') 
        @index += 1
        return {
            type: Token[:Punctuator],
            value: ch1,
            lineNumber: @lineNumber,
            lineStart: @lineStart,
            range: [start, @index]
        }
    end

    # Dot (.) can also start a floating-point number, hence the need
    # to check the next character.

    ch2 = @source[@index + 1]
    if (ch1 == '.' && !isDecimalDigit(ch2)) 
        return {
            type: Token[:Punctuator],
            value: curCharAndMoveNext,
            lineNumber: @lineNumber,
            lineStart: @lineStart,
            range: [start, @index]
        }
    end

    # Peek more characters.

    ch3 = @source[@index + 2]
    ch4 = @source[@index + 3]

    # 4-character punctuator: >>>=

    if (ch1 == '>' && ch2 == '>' && ch3 == '>') 
        if (ch4 == '=') 
            @index += 4
            return {
                type: Token[:Punctuator],
                value: '>>>=',
                lineNumber: @lineNumber,
                lineStart: @lineStart,
                range: [start, @index]
            }
        end
    end

    # 3-character punctuators: == != >>> <<= >>=

    if (ch1 == '=' && ch2 == '=' && ch3 == '=') 
        @index += 3
        return {
            type: Token[:Punctuator],
            value: '===',
            lineNumber: @lineNumber,
            lineStart: @lineStart,
            range: [start, @index]
        }
    end

    if (ch1 == '!' && ch2 == '=' && ch3 == '=') 
        @index += 3
        return {
            type: Token[:Punctuator],
            value: '!==',
            lineNumber: @lineNumber,
            lineStart: @lineStart,
            range: [start, @index]
        }
    end

    if (ch1 == '>' && ch2 == '>' && ch3 == '>') 
        @index += 3
        return {
            type: Token[:Punctuator],
            value: '>>>',
            lineNumber: @lineNumber,
            lineStart: @lineStart,
            range: [start, @index]
        }
    end

    if (ch1 == '<' && ch2 == '<' && ch3 == '=') 
        @index += 3
        return {
            type: Token[:Punctuator],
            value: '<<=',
            lineNumber: @lineNumber,
            lineStart: @lineStart,
            range: [start, @index]
        }
    end

    if (ch1 == '>' && ch2 == '>' && ch3 == '=') 
        @index += 3
        return {
            type: Token[:Punctuator],
            value: '>>=',
            lineNumber: @lineNumber,
            lineStart: @lineStart,
            range: [start, @index]
        }
    end

    # 2-character punctuators: <= >= == != ++ -- << >> && ||
    # += -= *= %= &= |= ^= /=

    if (ch2 == '=') 
        if ('<>=!+-*%&|^/'.include?(ch1)) 
            @index += 2
            return {
                type: Token[:Punctuator],
                value: ch1 + ch2,
                lineNumber: @lineNumber,
                lineStart: @lineStart,
                range: [start, @index]
            }
        end
    end

    if (ch1 == ch2 && ('+-<>&|'.include?(ch1))) 
        if ('+-<>&|'.include?(ch2)) 
            @index += 2
            return {
                type: Token[:Punctuator],
                value: ch1 + ch2,
                lineNumber: @lineNumber,
                lineStart: @lineStart,
                range: [start, @index]
            }
        end
    end

    # The remaining 1-character punctuators.

    if ('[]<>+-*%&|^!~?:=/'.include?(ch1)) 
        return {
            type: Token[:Punctuator],
            value: curCharAndMoveNext,
            lineNumber: @lineNumber,
            lineStart: @lineStart,
            range: [start, @index]
        }
    end
end

#scanRegExp ⇒ Object 



836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
 
# File 'lib/ruby_run_js/jsparser.rb', line 836

def scanRegExp() 
    classMarker = false
    terminated = false

    @buffer = nil
    skipComment()

    start = @index
    ch = @source[@index]
    assert(ch == '/', 'Regular expression literal must start with a slash')
    str = curCharAndMoveNext

    while (@index < @length) 
        ch = curCharAndMoveNext
        str += ch
        if (ch == "\\") 
            ch = curCharAndMoveNext
            # ECMA-262 7.8.5
            if (isLineTerminator(ch)) 
                throwError(nil, Messages[:UnterminatedRegExp])
            end
            str += ch
        elsif (classMarker) 
            if (ch == ']') 
                classMarker = false
            end
        else
            if (ch == '/') 
                terminated = true
                break
            elsif (ch == '[') 
                classMarker = true
            elsif (isLineTerminator(ch)) 
                throwError(nil, Messages[:UnterminatedRegExp])
            end
        end
    end

    if (!terminated) 
        throwError(nil, Messages[:UnterminatedRegExp])
    end

    # Exclude leading and trailing slash.
    pattern = str[1, str.length - 2]

    flags = ''
    while (@index < @length) 
        ch = @source[@index]
        if (!isIdentifierPart(ch)) 
            break
        end

        @index += 1
        if (ch == "\\" && @index < @length) 
            ch = @source[@index]
            if (ch == 'u') 
                @index += 1
                restore = @index
                ch = scanHexEscape('u')
                if (ch)
                    flags += ch
                    str += "\\u"
                    while (restore < @index)
                        str += @source[restore]
                        restore += 1
                    end
                else
                    @index = restore
                    flags += 'u'
                    str += "\\u"
                end
            else
                str += "\\"
            end
        else
            flags += ch
            str += ch
        end
    end

    return {
        literal: str,
        value: sliceSource(start,@index),
        regexp: {
            pattern: str,
            flags: flags
        },
        range: [start, @index]
    }
end

#scanStringLiteral ⇒ Object

7.8.4 String Literals



741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
 
# File 'lib/ruby_run_js/jsparser.rb', line 741

def scanStringLiteral() 
    str = ''
    octal = false

    quote = @source[@index]
    assert((quote == "'" || quote == '"'),
        'String literal must starts with a quote')

    start = @index
    @index += 1

    while (@index < @length) 
        ch = curCharAndMoveNext

        if (ch == quote) 
            quote = ''
            break
        elsif (ch == "\\") 
            ch = curCharAndMoveNext
            if (!isLineTerminator(ch)) 
                case ch
                when 'n'
                    str += "\n"
                when 'r'
                    str += "\r"
                when 't'
                    str += "\t"
                when 'u','x'
                    restore = @index
                    unescaped = scanHexEscape(ch)
                    if (unescaped) 
                        str += unescaped
                    else
                        @index = restore
                        str += ch
                    end
                when 'b'
                    str += "\b"
                when 'f'
                    str += "\f"
                when 'v'
                    str += "\x0B"
                else
                    if (isOctalDigit(ch)) 
                        code = '01234567'.index(ch)

                        # \0 is not octal escape sequence
                        if (code != 0) 
                            octal = true
                        end

                        if (@index < @length && isOctalDigit(@source[@index])) 
                            octal = true
                            code = code * 8 + '01234567'.index(curCharAndMoveNext)

                            # 3 digits are only allowed when string starts
                            # with 0, 1, 2, 3
                            if ('0123'.include?(ch) &&
                                    @index < @length &&
                                    isOctalDigit(@source[@index])) then
                                code = code * 8 + '01234567'.index(curCharAndMoveNext)
                            end
                        end
                        str += [code].pack('U*')
                    else
                        str += ch || ''
                    end
                end
            else
                @lineNumber += 1
                if (ch ==  "\r" && @source[@index] == "\n") 
                    @index += 1
                end
            end
        elsif (isLineTerminator(ch)) 
            break
        else
            str += ch
        end
    end

    if (quote != '') 
        throwError(nil, Messages[:UnexpectedToken], 'ILLEGAL')
    end

    return {
        type: Token[:StringLiteral],
        value: str,
        octal: octal,
        lineNumber: @lineNumber,
        lineStart: @lineStart,
        range: [start, @index]
    }
end

#skipComment ⇒ Object

7.4 Comments



242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
 
# File 'lib/ruby_run_js/jsparser.rb', line 242

def skipComment()

    blockComment = false
    lineComment = false

    while (@index < @length) do
        ch = @source[@index]

        if (lineComment) 
            ch = curCharAndMoveNext
            if (isLineTerminator(ch)) 
                lineComment = false
                if (ch == "\r" && @source[@index] == "\n")
                    @index += 1
                end
                @lineNumber += 1
                @lineStart = @index
            end
        elsif (blockComment)
            if (isLineTerminator(ch))
                if (ch == "\r" && @source[@index + 1] == "\n") 
                    @index += 1
                end
                @lineNumber += 1
                @index += 1
                @lineStart = @index
                if (@index >= @length)
                    throwError(nil, Messages[:UnexpectedToken], 'ILLEGAL')
                end
            else
                ch = curCharAndMoveNext
                if (@index >= @length) 
                    throwError(nil, Messages[:UnexpectedToken], 'ILLEGAL')
                end
                if (ch == '*') 
                    ch = @source[@index]
                    if (ch == '/')
                        @index += 1
                        blockComment = false
                    end
                end
            end
        elsif (ch == '/') 
            ch = @source[@index + 1]
            if (ch == '/') 
                @index += 2
                lineComment = true
            elsif (ch == '*') 
                @index += 2
                blockComment = true
                if (@index >= @length) 
                    throwError(nil, Messages[:UnexpectedToken], 'ILLEGAL')
                end
            else
                break
            end
        elsif (isWhiteSpace(ch)) 
            @index += 1
        elsif (isLineTerminator(ch)) 
            @index += 1
            if (ch == "\r" && @source[@index] == "\n") 
                @index += 1
            end
            @lineNumber += 1
            @lineStart = @index
        else
            break
        end
    end
end

#sliceSource(from, to) ⇒ Object 



130
131
132
 
# File 'lib/ruby_run_js/jsparser.rb', line 130

def sliceSource(from, to) 
    return @source[from...to]
end

#throwError(token, messageFormat, *args) ⇒ Object

Throw an exception



1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
 
# File 'lib/ruby_run_js/jsparser.rb', line 1017

def throwError(token, messageFormat,*args)
    msg = messageFormat.gsub(/%(\d)/) do |i|
        args[i.to_i] || ''
    end

    if (token != nil) 
       # raise "Line #{token[:lineNumber]} at #{(token[:range][0] - token[:lineNumber] + 1)} : #{msg}"
        raise SyntaxError.new "Error: Line #{token[:lineNumber]}: #{msg}"
    else
      #  raise "Line #{@lineNumber} at #{@index - @lineStart + 1} : #{msg}"
        raise SyntaxError.new "Error: Line #{@lineNumber}: #{msg}"
    end
end

#throwErrorTolerant(token, messageFormat, *args) ⇒ Object 



1031
1032
1033
 
# File 'lib/ruby_run_js/jsparser.rb', line 1031

def throwErrorTolerant(token, messageFormat,*args)
    throwError(token,messageFormat,*args)
end

#throwUnexpected(token) ⇒ Object

Throw an exception because of the token.



1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
 
# File 'lib/ruby_run_js/jsparser.rb', line 1037

def throwUnexpected(token) 
    if (token[:type] == Token[:EOF]) 
        throwError(token, Messages[:UnexpectedEOS])
    end

    if (token[:type] == Token[:NumericLiteral]) 
        throwError(token, Messages[:UnexpectedNumber])
    end

    if (token[:type] == Token[:StringLiteral]) 
        throwError(token, Messages[:UnexpectedString])
    end

    if (token[:type] == Token[:Identifier]) 
        throwError(token, Messages[:UnexpectedIdentifier])
    end

    if (token[:type] == Token[:Keyword]) 
        if (isFutureReservedWord(token[:value])) 
            throwError(token, Messages[:UnexpectedReserved])
        elsif (@strict && isStrictModeReservedWord(token[:value])) 
            throwErrorTolerant(token, Messages[:StrictReservedWord])
            return
        end
        throwError(token, Messages[:UnexpectedToken], token[:value])
    end

    # BooleanLiteral, NullLiteral, or Punctuator.
    throwError(token, Messages[:UnexpectedToken], token[:value])
end

#trackGroupExpression ⇒ Object 



3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
 
# File 'lib/ruby_run_js/jsparser.rb', line 3264

def trackGroupExpression()

    skipComment()
    marker = createLocationMarker()
    expect('(')

    expr = parseExpression()

    expect(')')

    marker[:end].call()
    marker[:applyGroup].call(expr)

    return expr
end

#trackLeftHandSideExpression ⇒ Object 



3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
 
# File 'lib/ruby_run_js/jsparser.rb', line 3280

def trackLeftHandSideExpression() 

    skipComment()
    marker = createLocationMarker()

    expr = matchKeyword('new') ? parseNewExpression() : parsePrimaryExpression()

    while (match('.') || match('[')) 
        if (match('[')) 
            expr = {
                type: Syntax[:MemberExpression],
                computed: true,
                object: expr,
                property: parseComputedMember()
            }
            marker[:end].call()
            marker[:apply].call(expr)
        else
            expr = {
                type: Syntax[:MemberExpression],
                computed: false,
                object: expr,
                property: parseNonComputedMember()
            }
            marker[:end].call()
            marker[:apply].call(expr)
        end
    end

    return expr
end

#trackLeftHandSideExpressionAllowCall ⇒ Object 



3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
 
# File 'lib/ruby_run_js/jsparser.rb', line 3312

def trackLeftHandSideExpressionAllowCall()

    skipComment()
    marker = createLocationMarker()

    expr = matchKeyword('new') ? parseNewExpression() : parsePrimaryExpression()

    while (match('.') || match('[') || match('(')) 
        if (match('(')) 
            expr = {
                type: Syntax[:CallExpression],
                callee: expr,
                arguments: parseArguments()
            }
            marker[:end].call()
            marker[:apply].call(expr)
        elsif (match('[')) 
            expr = {
                type: Syntax[:MemberExpression],
                computed: true,
                object: expr,
                property: parseComputedMember()
            }
            marker[:end].call()
            marker[:apply].call(expr)
        else
            expr = {
                type: Syntax[:MemberExpression],
                computed: false,
                object: expr,
                property: parseNonComputedMember()
            }
            marker[:end].call()
            marker[:apply].call(expr)
        end
    end

    return expr
end