Actualizados
- allcalidad: Cambio de dominio - animeflv: Correción - streamcloud - Actualización interna
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Intel1
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from pyjsparser.pyjsparserdata import *
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REGEXP_SPECIAL_SINGLE = {'\\', '^', '$', '*', '+', '?', '.'}
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NOT_PATTERN_CHARS = {
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'^', '$', '\\', '.', '*', '+', '?', '(', ')', '[', ']', '|'
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} # what about '{', '}', ???
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CHAR_CLASS_ESCAPE = {'d', 'D', 's', 'S', 'w', 'W'}
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CONTROL_ESCAPE_CHARS = {'f', 'n', 'r', 't', 'v'}
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CONTROL_LETTERS = {
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'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
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'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D',
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'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S',
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'T', 'U', 'V', 'W', 'X', 'Y', 'Z'
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}
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def SpecialChar(char):
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return {'type': 'SpecialChar', 'content': char}
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def isPatternCharacter(char):
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return char not in NOT_PATTERN_CHARS
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class JsRegExpParser:
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def __init__(self, source, flags):
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self.source = source
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self.flags = flags
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self.index = 0
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self.length = len(source)
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self.lineNumber = 0
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self.lineStart = 0
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def parsePattern(self):
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'''Perform sctring escape - for regexp literals'''
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return {'type': 'Pattern', 'contents': self.parseDisjunction()}
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def parseDisjunction(self):
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alternatives = []
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while True:
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alternatives.append(self.parseAlternative())
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if not self.isEOF():
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self.expect_character('|')
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else:
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break
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return {'type': 'Disjunction', 'contents': alternatives}
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def isEOF(self):
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if self.index >= self.length:
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return True
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return False
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def expect_character(self, character):
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if self.source[self.index] != character:
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self.throwUnexpected(character)
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self.index += 1
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def parseAlternative(self):
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contents = []
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while not self.isEOF() and self.source[self.index] != '|':
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contents.append(self.parseTerm())
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return {'type': 'Alternative', 'contents': contents}
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def follows(self, chars):
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for i, c in enumerate(chars):
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if self.index + i >= self.length or self.source[self.index +
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i] != c:
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return False
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return True
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def parseTerm(self):
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assertion = self.parseAssertion()
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if assertion:
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return assertion
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else:
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return {
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'type': 'Term',
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'contents': self.parseAtom()
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} # quantifier will go inside atom!
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def parseAssertion(self):
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if self.follows('$'):
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content = SpecialChar('$')
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self.index += 1
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elif self.follows('^'):
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content = SpecialChar('^')
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self.index += 1
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elif self.follows('\\b'):
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content = SpecialChar('\\b')
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self.index += 2
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elif self.follows('\\B'):
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content = SpecialChar('\\B')
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self.index += 2
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elif self.follows('(?='):
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self.index += 3
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dis = self.parseDisjunction()
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self.expect_character(')')
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content = {'type': 'Lookached', 'contents': dis, 'negated': False}
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elif self.follows('(?!'):
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self.index += 3
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dis = self.parseDisjunction()
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self.expect_character(')')
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content = {'type': 'Lookached', 'contents': dis, 'negated': True}
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else:
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return None
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return {'type': 'Assertion', 'content': content}
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def parseAtom(self):
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if self.follows('.'):
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content = SpecialChar('.')
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self.index += 1
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elif self.follows('\\'):
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self.index += 1
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content = self.parseAtomEscape()
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elif self.follows('['):
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content = self.parseCharacterClass()
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elif self.follows('(?:'):
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self.index += 3
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dis = self.parseDisjunction()
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self.expect_character(')')
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content = 'idk'
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elif self.follows('('):
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self.index += 1
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dis = self.parseDisjunction()
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self.expect_character(')')
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content = 'idk'
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elif isPatternCharacter(self.source[self.index]):
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content = self.source[self.index]
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self.index += 1
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else:
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return None
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quantifier = self.parseQuantifier()
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return {'type': 'Atom', 'content': content, 'quantifier': quantifier}
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def parseQuantifier(self):
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prefix = self.parseQuantifierPrefix()
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if not prefix:
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return None
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greedy = True
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if self.follows('?'):
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self.index += 1
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greedy = False
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return {'type': 'Quantifier', 'contents': prefix, 'greedy': greedy}
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def parseQuantifierPrefix(self):
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if self.isEOF():
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return None
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if self.follows('+'):
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content = '+'
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self.index += 1
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elif self.follows('?'):
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content = '?'
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self.index += 1
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elif self.follows('*'):
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content = '*'
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self.index += 1
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elif self.follows(
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'{'
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): # try matching otherwise return None and restore the state
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i = self.index
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self.index += 1
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digs1 = self.scanDecimalDigs()
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# if no minimal number of digs provided then return no quantifier
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if not digs1:
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self.index = i
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return None
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# scan char limit if provided
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if self.follows(','):
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self.index += 1
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digs2 = self.scanDecimalDigs()
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else:
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digs2 = ''
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# must be valid!
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if not self.follows('}'):
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self.index = i
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return None
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else:
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self.expect_character('}')
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content = int(digs1), int(digs2) if digs2 else None
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else:
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return None
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return content
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def parseAtomEscape(self):
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ch = self.source[self.index]
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if isDecimalDigit(ch) and ch != 0:
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digs = self.scanDecimalDigs()
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elif ch in CHAR_CLASS_ESCAPE:
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self.index += 1
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return SpecialChar('\\' + ch)
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else:
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return self.parseCharacterEscape()
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def parseCharacterEscape(self):
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ch = self.source[self.index]
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if ch in CONTROL_ESCAPE_CHARS:
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return SpecialChar('\\' + ch)
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if ch == 'c':
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'ok, fuck this shit.'
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def scanDecimalDigs(self):
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s = self.index
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while not self.isEOF() and isDecimalDigit(self.source[self.index]):
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self.index += 1
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return self.source[s:self.index]
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a = JsRegExpParser('a(?=x)', '')
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print(a.parsePattern())
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