mirror of
https://github.com/clinton-hall/nzbToMedia.git
synced 2024-11-14 09:30:21 -08:00
381 lines
12 KiB
Python
381 lines
12 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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Chain patterns and handle repetiting capture group
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"""
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# pylint: disable=super-init-not-called
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import itertools
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from .builder import Builder
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from .loose import call
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from .match import Match, Matches
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from .pattern import Pattern, filter_match_kwargs, BasePattern
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from .remodule import re
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class _InvalidChainException(Exception):
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"""
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Internal exception raised when a chain is not valid
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"""
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pass
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class Chain(Pattern, Builder):
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"""
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Definition of a pattern chain to search for.
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"""
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def __init__(self, parent, chain_breaker=None, **kwargs):
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Builder.__init__(self)
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call(Pattern.__init__, self, **kwargs)
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self._kwargs = kwargs
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self._match_kwargs = filter_match_kwargs(kwargs)
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if callable(chain_breaker):
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self.chain_breaker = chain_breaker
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else:
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self.chain_breaker = None
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self.parent = parent
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self.parts = []
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def pattern(self, *pattern):
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"""
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:param pattern:
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:return:
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"""
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if not pattern:
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raise ValueError("One pattern should be given to the chain")
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if len(pattern) > 1:
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raise ValueError("Only one pattern can be given to the chain")
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part = ChainPart(self, pattern[0])
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self.parts.append(part)
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return part
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def close(self):
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"""
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Deeply close the chain
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:return: Rebulk instance
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"""
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parent = self.parent
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while isinstance(parent, Chain):
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parent = parent.parent
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return parent
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def _match(self, pattern, input_string, context=None):
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# pylint: disable=too-many-locals,too-many-nested-blocks
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chain_matches = []
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chain_input_string = input_string
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offset = 0
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while offset < len(input_string):
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chain_found = False
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current_chain_matches = []
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valid_chain = True
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for chain_part in self.parts:
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try:
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chain_part_matches, raw_chain_part_matches = chain_part.matches(chain_input_string,
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context,
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with_raw_matches=True)
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chain_found, chain_input_string, offset = \
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self._to_next_chain_part(chain_part, chain_part_matches, raw_chain_part_matches, chain_found,
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input_string, chain_input_string, offset, current_chain_matches)
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except _InvalidChainException:
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valid_chain = False
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if current_chain_matches:
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offset = current_chain_matches[0].raw_end
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break
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if not chain_found:
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break
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if current_chain_matches and valid_chain:
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match = self._build_chain_match(current_chain_matches, input_string)
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chain_matches.append(match)
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return chain_matches
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def _to_next_chain_part(self, chain_part, chain_part_matches, raw_chain_part_matches, chain_found,
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input_string, chain_input_string, offset, current_chain_matches):
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Chain._fix_matches_offset(chain_part_matches, input_string, offset)
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Chain._fix_matches_offset(raw_chain_part_matches, input_string, offset)
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if raw_chain_part_matches:
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grouped_matches_dict = self._group_by_match_index(chain_part_matches)
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grouped_raw_matches_dict = self._group_by_match_index(raw_chain_part_matches)
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for match_index, grouped_raw_matches in grouped_raw_matches_dict.items():
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chain_found = True
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offset = grouped_raw_matches[-1].raw_end
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chain_input_string = input_string[offset:]
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if not chain_part.is_hidden:
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grouped_matches = grouped_matches_dict.get(match_index, [])
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if self._chain_breaker_eval(current_chain_matches + grouped_matches):
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current_chain_matches.extend(grouped_matches)
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return chain_found, chain_input_string, offset
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def _process_match(self, match, match_index, child=False):
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"""
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Handle a match
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:param match:
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:type match:
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:param match_index:
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:type match_index:
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:param child:
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:type child:
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:return:
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:rtype:
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"""
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# pylint: disable=too-many-locals
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ret = super(Chain, self)._process_match(match, match_index, child=child)
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if ret:
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return True
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if match.children:
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last_pattern = match.children[-1].pattern
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last_pattern_groups = self._group_by_match_index(
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[child_ for child_ in match.children if child_.pattern == last_pattern]
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)
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if last_pattern_groups:
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original_children = Matches(match.children)
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original_end = match.end
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for index in reversed(list(last_pattern_groups)):
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last_matches = last_pattern_groups[index]
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for last_match in last_matches:
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match.children.remove(last_match)
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match.end = match.children[-1].end if match.children else match.start
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ret = super(Chain, self)._process_match(match, match_index, child=child)
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if ret:
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return True
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match.children = original_children
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match.end = original_end
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return False
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def _build_chain_match(self, current_chain_matches, input_string):
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start = None
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end = None
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for match in current_chain_matches:
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if start is None or start > match.start:
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start = match.start
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if end is None or end < match.end:
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end = match.end
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match = call(Match, start, end, pattern=self, input_string=input_string, **self._match_kwargs)
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for chain_match in current_chain_matches:
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if chain_match.children:
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for child in chain_match.children:
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match.children.append(child)
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if chain_match not in match.children:
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match.children.append(chain_match)
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chain_match.parent = match
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return match
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def _chain_breaker_eval(self, matches):
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return not self.chain_breaker or not self.chain_breaker(Matches(matches))
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@staticmethod
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def _fix_matches_offset(chain_part_matches, input_string, offset):
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for chain_part_match in chain_part_matches:
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if chain_part_match.input_string != input_string:
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chain_part_match.input_string = input_string
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chain_part_match.end += offset
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chain_part_match.start += offset
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if chain_part_match.children:
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Chain._fix_matches_offset(chain_part_match.children, input_string, offset)
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@staticmethod
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def _group_by_match_index(matches):
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grouped_matches_dict = dict()
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for match_index, match in itertools.groupby(matches, lambda m: m.match_index):
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grouped_matches_dict[match_index] = list(match)
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return grouped_matches_dict
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@property
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def match_options(self):
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return {}
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@property
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def patterns(self):
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return [self]
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def __repr__(self):
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defined = ""
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if self.defined_at:
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defined = "@%s" % (self.defined_at,)
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return "<%s%s:%s>" % (self.__class__.__name__, defined, self.parts)
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class ChainPart(BasePattern):
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"""
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Part of a pattern chain.
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"""
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def __init__(self, chain, pattern):
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self._chain = chain
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self.pattern = pattern
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self.repeater_start = 1
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self.repeater_end = 1
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self._hidden = False
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@property
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def _is_chain_start(self):
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return self._chain.parts[0] == self
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def matches(self, input_string, context=None, with_raw_matches=False):
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matches, raw_matches = self.pattern.matches(input_string, context=context, with_raw_matches=True)
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matches = self._truncate_repeater(matches, input_string)
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raw_matches = self._truncate_repeater(raw_matches, input_string)
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self._validate_repeater(raw_matches)
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if with_raw_matches:
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return matches, raw_matches
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return matches
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def _truncate_repeater(self, matches, input_string):
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if not matches:
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return matches
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if not self._is_chain_start:
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separator = input_string[0:matches[0].initiator.raw_start]
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if separator:
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return []
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j = 1
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for i in range(0, len(matches) - 1):
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separator = input_string[matches[i].initiator.raw_end:
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matches[i + 1].initiator.raw_start]
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if separator:
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break
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j += 1
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truncated = matches[:j]
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if self.repeater_end is not None:
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truncated = [m for m in truncated if m.match_index < self.repeater_end]
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return truncated
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def _validate_repeater(self, matches):
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max_match_index = -1
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if matches:
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max_match_index = max([m.match_index for m in matches])
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if max_match_index + 1 < self.repeater_start:
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raise _InvalidChainException
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def chain(self):
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"""
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Add patterns chain, using configuration from this chain
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:return:
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:rtype:
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"""
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return self._chain.chain()
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def hidden(self, hidden=True):
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"""
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Hide chain part results from global chain result
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:param hidden:
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:type hidden:
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:return:
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:rtype:
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"""
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self._hidden = hidden
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return self
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@property
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def is_hidden(self):
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"""
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Check if the chain part is hidden
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:return:
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:rtype:
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"""
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return self._hidden
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def regex(self, *pattern, **kwargs):
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"""
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Add re pattern
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:param pattern:
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:type pattern:
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:param kwargs:
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:type kwargs:
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:return:
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:rtype:
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"""
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return self._chain.regex(*pattern, **kwargs)
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def functional(self, *pattern, **kwargs):
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"""
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Add functional pattern
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:param pattern:
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:type pattern:
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:param kwargs:
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:type kwargs:
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:return:
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:rtype:
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"""
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return self._chain.functional(*pattern, **kwargs)
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def string(self, *pattern, **kwargs):
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"""
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Add string pattern
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:param pattern:
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:type pattern:
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:param kwargs:
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:type kwargs:
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:return:
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:rtype:
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"""
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return self._chain.string(*pattern, **kwargs)
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def close(self):
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"""
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Close the chain builder to continue registering other patterns
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:return:
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:rtype:
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"""
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return self._chain.close()
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def repeater(self, value):
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"""
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Define the repeater of the current chain part.
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:param value:
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:type value:
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:return:
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:rtype:
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"""
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try:
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value = int(value)
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self.repeater_start = value
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self.repeater_end = value
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return self
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except ValueError:
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pass
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if value == '+':
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self.repeater_start = 1
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self.repeater_end = None
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if value == '*':
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self.repeater_start = 0
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self.repeater_end = None
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elif value == '?':
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self.repeater_start = 0
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self.repeater_end = 1
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else:
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match = re.match(r'\{\s*(\d*)\s*,?\s*(\d*)\s*\}', value)
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if match:
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start = match.group(1)
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end = match.group(2)
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if start or end:
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self.repeater_start = int(start) if start else 0
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self.repeater_end = int(end) if end else None
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return self
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def __repr__(self):
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return "%s({%s,%s})" % (self.pattern, self.repeater_start, self.repeater_end)
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