def run(self, text, pos=0, search=False):
self._group_defined = False
# TODO - add explicit search if expression starts with constant
result = self._run_from(0, text, pos, search)
if self._group_defined:
raise UnsupportedOperation('groups')
else:
return result
def lookahead(self, next, equal, forwards):
(index, node) = next[1]
# discard old values
if self._lookaheads[0] != self._offset:
self._lookaheads = (self._offset, {})
lookaheads = self._lookaheads[1]
if index not in lookaheads:
# requires complex engine
(reads, _mutates, size) = lookahead_logic(node, forwards, None)
if reads:
raise UnsupportedOperation('lookahead')
# invoke simple engine and cache
self.push()
try:
if forwards:
text = self._text
pos = self._offset
search = False
else:
text = self._text[0:self._offset]
if size is None:
pos = 0
search = True
else:
pos = self._offset - size
search = False
result = bool(self._run_from(index, text, pos,
search)) == equal
finally:
self.pop()
lookaheads[index] = result
if lookaheads[index]:
return 0
else:
raise Fail
def dot(self, multiline):
raise UnsupportedOperation('dot')
def end_of_line(self, next, multiline, state=None):
raise UnsupportedOperation('end_of_line')
def no_match(self):
raise UnsupportedOperation('no_match')
def conditional(self, next, number):
raise UnsupportedOperation('conditional')
def lookahead(self, equal, forwards):
raise UnsupportedOperation('lookahead')
def space(self, inverted):
raise UnsupportedOperation('space')
def checkpoint(self, id):
raise UnsupportedOperation('checkpoint')
def start_of_line(self, multiline):
raise UnsupportedOperation('start_of_line')
def word_boundary(self, inverted):
raise UnsupportedOperation('word_boundary')
def word(self, next, inverted, state=None):
raise UnsupportedOperation('word')
def checkpoint(self, next, id, state=None):
raise UnsupportedOperation('checkpoint')
def space(self, next, inverted, state=None):
raise UnsupportedOperation('space')
def digit(self, next, inverted, state=None):
raise UnsupportedOperation('digit')
def word_boundary(self, next, inverted, state=None):
raise UnsupportedOperation('word_boundary')
def repeat(self, next, node, begin, end, lazy, state=None):
raise UnsupportedOperation('repeat')
def lookahead(self, next, node, equal, forwards, state=None):
raise UnsupportedOperation('lookahead')
def end_of_line(self, multiline):
raise UnsupportedOperation('end_of_line')
def string(self, text):
raise UnsupportedOperation('string')
def digit(self, inverted):
raise UnsupportedOperation('digit')
def character(self, charset):
raise UnsupportedOperation('character')
def word(self, inverted):
raise UnsupportedOperation('word')
def start_group(self, number):
raise UnsupportedOperation('start_group')
def group_reference(self, next, number):
raise UnsupportedOperation('group_reference')
def end_group(self, number):
raise UnsupportedOperation('end_group')
def split(self, next):
raise UnsupportedOperation('split')
def match(self):
raise UnsupportedOperation('match')
def repeat(self, begin, end, lazy):
raise UnsupportedOperation('repeat')
def dot(self, next, multiline, state=None):
raise UnsupportedOperation('dot')
