def _make_simple_parser():
ParserElement.setDefaultWhitespaceChars(" \n\t\r'")
wordchars = printables
for specialchar in ':+-"':
wordchars = wordchars.replace(specialchar, "")
wordtoken = Combine(Word(wordchars) + ZeroOrMore("." + Word(wordchars)))
# A word-like thing
generalWord = Group(wordtoken).setResultsName("Word")
# A quoted phrase
quotedPhrase = Group(Suppress('"') + CharsNotIn('"') + Suppress('"')).setResultsName("Quotes")
# Units of content
fieldableUnit = quotedPhrase | generalWord
fieldedUnit = Group(Word(alphanums) + Suppress(':') + fieldableUnit).setResultsName("Field")
unit = fieldedUnit | fieldableUnit
# A unit may be "not"-ed.
operatorNot = Group(Suppress(Literal("-")) + unit).setResultsName("Not")
# A unit may be required
operatorReqd = Group(Suppress(Literal("+")) + unit).setResultsName("Required")
generalUnit = operatorNot | operatorReqd | unit
expression = (OneOrMore(generalUnit) | Empty())
toplevel = Group(expression).setResultsName("Toplevel") + StringEnd()
return toplevel.parseString
def _make_simple_parser():
ParserElement.setDefaultWhitespaceChars(" \n\t\r'")
wordToken = Regex(r"(\w|/)+(\.?(\w|\-|/)+)*", re.UNICODE)
# A word-like thing
generalWord = Group(wordToken).setResultsName("Word")
# A quoted phrase
quotedPhrase = Group(Suppress('"') + CharsNotIn('"') +
Suppress('"')).setResultsName("Quotes")
# Units of content
fieldableUnit = quotedPhrase | generalWord
fieldedUnit = Group(Word(alphanums) + Suppress(':') +
fieldableUnit).setResultsName("Field")
unit = fieldedUnit | fieldableUnit
# A unit may be "not"-ed.
operatorNot = Group(Suppress(Literal("-")) + unit).setResultsName("Not")
# A unit may be required
operatorReqd = Group(Suppress(Literal("+")) +
unit).setResultsName("Required")
generalUnit = operatorNot | operatorReqd | unit
expression = (OneOrMore(generalUnit) | Empty())
toplevel = Group(expression).setResultsName("Toplevel") + StringEnd()
return toplevel.parseString
def _make_simple_parser():
ParserElement.setDefaultWhitespaceChars(" \n\t\r'")
wordToken = Regex(r"(\w|/)+(\.?(\w|\-|/)+)*", re.UNICODE)
# A word-like thing
generalWord = Group(wordToken).setResultsName("Word")
# A quoted phrase
quotedPhrase = Group(Suppress('"') + CharsNotIn('"') + Suppress('"')).setResultsName("Quotes")
# Units of content
fieldableUnit = quotedPhrase | generalWord
fieldedUnit = Group(Word(alphanums) + Suppress(':') + fieldableUnit).setResultsName("Field")
unit = fieldedUnit | fieldableUnit
# A unit may be "not"-ed.
operatorNot = Group(Suppress(Literal("-")) + unit).setResultsName("Not")
# A unit may be required
operatorReqd = Group(Suppress(Literal("+")) + unit).setResultsName("Required")
generalUnit = operatorNot | operatorReqd | unit
expression = (OneOrMore(generalUnit) | Empty())
toplevel = Group(expression).setResultsName("Toplevel") + StringEnd()
return toplevel.parseString
def _make_default_parser():
ParserElement.setDefaultWhitespaceChars(" \n\t\r'")
#wordToken = Word(self.wordChars)
wordToken = Regex(r"(\w|/)+(\.?(\w|\-|/)+)*", re.UNICODE)
# A plain old word.
plainWord = Group(wordToken).setResultsName("Word")
# A word ending in a star (e.g. 'render*'), indicating that
# the search should do prefix expansion.
prefixWord = Group(Combine(wordToken + Suppress('*'))).setResultsName("Prefix")
# A wildcard word containing * or ?.
wildcard = Group(Regex(r"\w*(?:[\?\*]\w*)+")).setResultsName("Wildcard")
# A range of terms
range = Group(plainWord + Suppress("..") + plainWord).setResultsName("Range")
# A word-like thing
generalWord = range | prefixWord | wildcard | plainWord
# A quoted phrase
quotedPhrase = Group(Suppress('"') + CharsNotIn('"') + Suppress('"')).setResultsName("Quotes")
expression = Forward()
# Parentheses can enclose (group) any expression
parenthetical = Group((Suppress("(") + expression + Suppress(")"))).setResultsName("Group")
boostableUnit = quotedPhrase | generalWord
boostedUnit = Group(boostableUnit + Suppress("^") + Word("0123456789", ".0123456789")).setResultsName("Boost")
# The user can flag that a parenthetical group, quoted phrase, or word
# should be searched in a particular field by prepending 'fn:', where fn is
# the name of the field.
fieldableUnit = parenthetical | boostedUnit | boostableUnit
fieldedUnit = Group(Word(alphanums) + Suppress(':') + fieldableUnit).setResultsName("Field")
# Units of content
unit = fieldedUnit | fieldableUnit
# A unit may be "not"-ed.
operatorNot = Group(Suppress(Keyword("not", caseless=True)) + unit).setResultsName("Not")
generalUnit = operatorNot | unit
andToken = Keyword("and", caseless=True)
orToken = Keyword("or", caseless=True)
operatorAnd = Group(generalUnit + Suppress(andToken) + expression).setResultsName("And")
operatorOr = Group(generalUnit + Suppress(orToken) + expression).setResultsName("Or")
expression << (OneOrMore(operatorAnd | operatorOr | generalUnit) | Empty())
toplevel = Group(expression).setResultsName("Toplevel") + StringEnd()
return toplevel.parseString
