63 lines
2.6 KiB
Python
63 lines
2.6 KiB
Python
from __future__ import unicode_literals
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import re
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__DECIMAL_RE = r'(?:[1-9][0-9]*)|0'
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__OCTAL_RE = r'0[0-7]+'
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__HEXADECIMAL_RE = r'0[xX][0-9a-fA-F]+'
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__ESC_UNICODE_RE = r'u[0-9a-fA-F]{4}'
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__ESC_HEX_RE = r'x[0-9a-fA-F]{2}'
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# NOTE order is fixed due to regex matching, does not represent any precedence
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_punctuations = ['{', '}', '(', ')', '[', ']', '.', ';', ',', '?', ':']
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_logical_operator = ['||', '&&']
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_unary_operator = ['++', '--', '!', '~', 'delete', 'void', 'typeof']
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_relation = ['===', '!==', '==', '!=', '<=', '>=', '<', '>']
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_operator = ['|', '^', '&', '>>>', '>>', '<<', '-', '+', '%', '/', '*']
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_assign_operator = [op + '=' for op in _operator]
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_assign_operator.append('=')
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# XXX add support for unicode chars
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_NAME_RE = r'[a-zA-Z_$][a-zA-Z_$0-9]*'
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# non-escape char also can be escaped, but line continuation and quotes has to be
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# XXX unicode and hexadecimal escape sequences should be validated
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_SINGLE_QUOTED_RE = r"""'(?:(?:\\'|\n)|[^'\n])*'"""
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_DOUBLE_QUOTED_RE = r'''"(?:(?:\\"|\n)|[^"\n])*"'''
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_STRING_RE = r'(?:%s)|(?:%s)' % (_SINGLE_QUOTED_RE, _DOUBLE_QUOTED_RE)
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_INTEGER_RE = r'(?:%(hex)s)|(?:%(dec)s)|(?:%(oct)s)' % {'hex': __HEXADECIMAL_RE, 'dec': __DECIMAL_RE, 'oct': __OCTAL_RE}
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_FLOAT_RE = r'(?:(?:%(dec)s\.[0-9]*)|(?:\.[0-9]+))(?:[eE][+-]?[0-9]+)?' % {'dec': __DECIMAL_RE}
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_BOOL_RE = r'true|false'
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_NULL_RE = r'null'
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# XXX early validation might needed
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# r'''/(?!\*)
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# (?:(?:\\(?:[tnvfr0.\\+*?^$\[\]{}()|/]|[0-7]{3}|x[0-9A-Fa-f]{2}|u[0-9A-Fa-f]{4}|c[A-Z]|))|[^/\n])*
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# /(?:(?![gimy]*(?P<flag>[gimy])[gimy]*(?P=flag))[gimy]{0,4}\b|\s|$)'''
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_REGEX_FLAGS_RE = r'(?![gimy]*(?P<reflag>[gimy])[gimy]*(?P=reflag))(?P<reflags>[gimy]{0,4}\b)'
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_REGEX_RE = r'/(?!\*)(?P<rebody>(?:[^/\n]|(?:\\/))*)/(?:(?:%s)|(?:\s|$))' % _REGEX_FLAGS_RE
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_TOKENS = [
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('null', _NULL_RE),
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('bool', _BOOL_RE),
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('id', _NAME_RE),
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('str', _STRING_RE),
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('int', _INTEGER_RE),
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('float', _FLOAT_RE),
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('regex', _REGEX_RE)
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]
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COMMENT_RE = r'(?P<comment>/\*(?:(?!\*/)(?:\n|.))*\*/)'
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TOKENS_RE = r'|'.join('(?P<%(id)s>%(value)s)' % {'id': name, 'value': value}
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for name, value in _TOKENS)
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PUNCTUATIONS_RE = r'(?P<punc>%s)' % r'|'.join(re.escape(value) for value in _punctuations)
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LOGICAL_OPERATORS_RE = r'(?P<lop>%s)' % r'|'.join(re.escape(value) for value in _logical_operator)
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UNARY_OPERATORS_RE = r'(?P<uop>%s)' % r'|'.join(re.escape(value) for value in _unary_operator)
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RELATIONS_RE = r'(?P<rel>%s)' % r'|'.join(re.escape(value) for value in _relation)
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OPERATORS_RE = r'(?P<op>%s)' % r'|'.join(re.escape(value) for value in _operator)
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ASSIGN_OPERATORS_RE = r'(?P<aop>%s)' % r'|'.join(re.escape(value) for value in _assign_operator)
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