--- /dev/null
+# The MIT License
+#
+# Copyright 2014, 2015 Piotr Dabkowski
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the 'Software'),
+# to deal in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+# the Software, and to permit persons to whom the Software is furnished to do so, subject
+# to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all copies or
+# substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
+# LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
+# OR THE USE OR OTHER DEALINGS IN THE SOFTWARE
+from __future__ import unicode_literals
+
+import sys
+import unicodedata
+from collections import defaultdict
+
+PY3 = sys.version_info >= (3,0)
+
+if PY3:
+ unichr = chr
+ xrange = range
+ unicode = str
+
+token = {
+ 'BooleanLiteral': 1,
+ 'EOF': 2,
+ 'Identifier': 3,
+ 'Keyword': 4,
+ 'NullLiteral': 5,
+ 'NumericLiteral': 6,
+ 'Punctuator': 7,
+ 'StringLiteral': 8,
+ 'RegularExpression': 9,
+ 'Template': 10
+ }
+
+
+TokenName = dict((v,k) for k,v in token.items())
+
+FnExprTokens = ['(', '{', '[', 'in', 'typeof', 'instanceof', 'new',
+ 'return', 'case', 'delete', 'throw', 'void',
+ # assignment operators
+ '=', '+=', '-=', '*=', '/=', '%=', '<<=', '>>=', '>>>=',
+ '&=', '|=', '^=', ',',
+ # binary/unary operators
+ '+', '-', '*', '/', '%', '++', '--', '<<', '>>', '>>>', '&',
+ '|', '^', '!', '~', '&&', '||', '?', ':', '===', '==', '>=',
+ '<=', '<', '>', '!=', '!==']
+
+syntax= set(('AssignmentExpression',
+ 'AssignmentPattern',
+ 'ArrayExpression',
+ 'ArrayPattern',
+ 'ArrowFunctionExpression',
+ 'BlockStatement',
+ 'BinaryExpression',
+ 'BreakStatement',
+ 'CallExpression',
+ 'CatchClause',
+ 'ClassBody',
+ 'ClassDeclaration',
+ 'ClassExpression',
+ 'ConditionalExpression',
+ 'ContinueStatement',
+ 'DoWhileStatement',
+ 'DebuggerStatement',
+ 'EmptyStatement',
+ 'ExportAllDeclaration',
+ 'ExportDefaultDeclaration',
+ 'ExportNamedDeclaration',
+ 'ExportSpecifier',
+ 'ExpressionStatement',
+ 'ForStatement',
+ 'ForInStatement',
+ 'FunctionDeclaration',
+ 'FunctionExpression',
+ 'Identifier',
+ 'IfStatement',
+ 'ImportDeclaration',
+ 'ImportDefaultSpecifier',
+ 'ImportNamespaceSpecifier',
+ 'ImportSpecifier',
+ 'Literal',
+ 'LabeledStatement',
+ 'LogicalExpression',
+ 'MemberExpression',
+ 'MethodDefinition',
+ 'NewExpression',
+ 'ObjectExpression',
+ 'ObjectPattern',
+ 'Program',
+ 'Property',
+ 'RestElement',
+ 'ReturnStatement',
+ 'SequenceExpression',
+ 'SpreadElement',
+ 'Super',
+ 'SwitchCase',
+ 'SwitchStatement',
+ 'TaggedTemplateExpression',
+ 'TemplateElement',
+ 'TemplateLiteral',
+ 'ThisExpression',
+ 'ThrowStatement',
+ 'TryStatement',
+ 'UnaryExpression',
+ 'UpdateExpression',
+ 'VariableDeclaration',
+ 'VariableDeclarator',
+ 'WhileStatement',
+ 'WithStatement'))
+
+
+# Error messages should be identical to V8.
+messages = {
+ 'UnexpectedToken': 'Unexpected token %s',
+ 'UnexpectedNumber': 'Unexpected number',
+ 'UnexpectedString': 'Unexpected string',
+ 'UnexpectedIdentifier': 'Unexpected identifier',
+ 'UnexpectedReserved': 'Unexpected reserved word',
+ 'UnexpectedTemplate': 'Unexpected quasi %s',
+ '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 \'%s\'',
+ 'Redeclaration': '%s \'%s\' 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.',
+ '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',
+ 'TemplateOctalLiteral': 'Octal literals are not allowed in template strings.',
+ 'ParameterAfterRestParameter': 'Rest parameter must be last formal parameter',
+ 'DefaultRestParameter': 'Unexpected token =',
+ 'ObjectPatternAsRestParameter': 'Unexpected token {',
+ 'DuplicateProtoProperty': 'Duplicate __proto__ fields are not allowed in object literals',
+ 'ConstructorSpecialMethod': 'Class constructor may not be an accessor',
+ 'DuplicateConstructor': 'A class may only have one constructor',
+ 'StaticPrototype': 'Classes may not have static property named prototype',
+ 'MissingFromClause': 'Unexpected token',
+ 'NoAsAfterImportNamespace': 'Unexpected token',
+ 'InvalidModuleSpecifier': 'Unexpected token',
+ 'IllegalImportDeclaration': 'Unexpected token',
+ 'IllegalExportDeclaration': 'Unexpected token'}
+
+PRECEDENCE = {'||':1,
+ '&&':2,
+ '|':3,
+ '^':4,
+ '&':5,
+ '==':6,
+ '!=':6,
+ '===':6,
+ '!==':6,
+ '<':7,
+ '>':7,
+ '<=':7,
+ '>=':7,
+ 'instanceof':7,
+ 'in':7,
+ '<<':8,
+ '>>':8,
+ '>>>':8,
+ '+':9,
+ '-':9,
+ '*':11,
+ '/':11,
+ '%':11}
+
+class Token: pass
+class Syntax: pass
+class Messages: pass
+class PlaceHolders:
+ ArrowParameterPlaceHolder = 'ArrowParameterPlaceHolder'
+
+for k,v in token.items():
+ setattr(Token, k, v)
+
+for e in syntax:
+ setattr(Syntax, e, e)
+
+for k,v in messages.items():
+ setattr(Messages, k, v)
+
+#http://stackoverflow.com/questions/14245893/efficiently-list-all-characters-in-a-given-unicode-category
+BOM = u'\uFEFF'
+ZWJ = u'\u200D'
+ZWNJ = u'\u200C'
+TAB = u'\u0009'
+VT = u'\u000B'
+FF = u'\u000C'
+SP = u'\u0020'
+NBSP = u'\u00A0'
+LF = u'\u000A'
+CR = u'\u000D'
+LS = u'\u2028'
+PS = u'\u2029'
+
+U_CATEGORIES = defaultdict(list)
+for c in map(unichr, range(sys.maxunicode + 1)):
+ U_CATEGORIES[unicodedata.category(c)].append(c)
+UNICODE_LETTER = set(U_CATEGORIES['Lu']+U_CATEGORIES['Ll']+
+ U_CATEGORIES['Lt']+U_CATEGORIES['Lm']+
+ U_CATEGORIES['Lo']+U_CATEGORIES['Nl'])
+UNICODE_COMBINING_MARK = set(U_CATEGORIES['Mn']+U_CATEGORIES['Mc'])
+UNICODE_DIGIT = set(U_CATEGORIES['Nd'])
+UNICODE_CONNECTOR_PUNCTUATION = set(U_CATEGORIES['Pc'])
+IDENTIFIER_START = UNICODE_LETTER.union(set(('$','_', '\\'))) # and some fucking unicode escape sequence
+IDENTIFIER_PART = IDENTIFIER_START.union(UNICODE_COMBINING_MARK).union(UNICODE_DIGIT)\
+ .union(UNICODE_CONNECTOR_PUNCTUATION).union(set((ZWJ, ZWNJ)))
+
+WHITE_SPACE = set((0x20, 0x09, 0x0B, 0x0C, 0xA0, 0x1680,
+ 0x180E, 0x2000, 0x2001, 0x2002, 0x2003,
+ 0x2004, 0x2005, 0x2006, 0x2007, 0x2008,
+ 0x2009, 0x200A, 0x202F, 0x205F, 0x3000,
+ 0xFEFF))
+
+LINE_TERMINATORS = set((0x0A, 0x0D, 0x2028, 0x2029))
+
+def isIdentifierStart(ch):
+ return (ch if isinstance(ch, unicode) else unichr(ch)) in IDENTIFIER_START
+
+def isIdentifierPart(ch):
+ return (ch if isinstance(ch, unicode) else unichr(ch)) in IDENTIFIER_PART
+
+def isWhiteSpace(ch):
+ return (ord(ch) if isinstance(ch, unicode) else ch) in WHITE_SPACE
+
+def isLineTerminator(ch):
+ return (ord(ch) if isinstance(ch, unicode) else ch) in LINE_TERMINATORS
+
+OCTAL = set(('0', '1', '2', '3', '4', '5', '6', '7'))
+DEC = set(('0', '1', '2', '3', '4', '5', '6', '7', '8', '9'))
+HEX = set('0123456789abcdefABCDEF')
+HEX_CONV = dict(('0123456789abcdef'[n],n) for n in xrange(16))
+for i,e in enumerate('ABCDEF', 10):
+ HEX_CONV[e] = i
+
+
+def isDecimalDigit(ch):
+ return (ch if isinstance(ch, unicode) else unichr(ch)) in DEC
+
+def isHexDigit(ch):
+ return (ch if isinstance(ch, unicode) else unichr(ch)) in HEX
+
+def isOctalDigit(ch):
+ return (ch if isinstance(ch, unicode) else unichr(ch)) in OCTAL
+
+def isFutureReservedWord(w):
+ return w in ('enum', 'export', 'import', 'super')
+
+
+RESERVED_WORD = set(('implements', 'interface', 'package', 'private', 'protected', 'public', 'static', 'yield', 'let'))
+def isStrictModeReservedWord(w):
+ return w in RESERVED_WORD
+
+def isRestrictedWord(w):
+ return w in ('eval', 'arguments')
+
+
+KEYWORDS = set(('if', 'in', 'do', 'var', 'for', 'new', 'try', 'let', 'this', 'else', 'case',
+ 'void', 'with', 'enum', 'while', 'break', 'catch', 'throw', 'const', 'yield',
+ 'class', 'super', 'return', 'typeof', 'delete', 'switch', 'export', 'import',
+ 'default', 'finally', 'extends', 'function', 'continue', 'debugger', 'instanceof', 'pyimport'))
+def isKeyword(w):
+ # 'const' is specialized as Keyword in V8.
+ # 'yield' and 'let' are for compatibility with SpiderMonkey and ES.next.
+ # Some others are from future reserved words.
+ return w in KEYWORDS
+
+
+class JsSyntaxError(Exception): pass
+
+if __name__=='__main__':
+ assert isLineTerminator('\n')
+ assert isLineTerminator(0x0A)
+ assert isIdentifierStart('$')
+ assert isIdentifierStart(100)
+ assert isWhiteSpace(' ')
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