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74 lines
2.7 KiB
74 lines
2.7 KiB
# Copyright 2013 Dean Gardiner <gardiner91@gmail.com>
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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class CaptureConstraint(object):
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def __init__(self, capture_group, comparisons=None, **kwargs):
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"""Capture constraint object
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:type capture_group: CaptureGroup
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"""
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self.capture_group = capture_group
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self.comparisons = comparisons if comparisons else []
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for key, value in kwargs.items():
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key = key.split('__')
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if len(key) != 2:
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continue
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name, method = key
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method = '_compare_' + method
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if not hasattr(self, method):
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continue
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self.comparisons.append((name, getattr(self, method), value))
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def _compare_eq(self, fragment, name, expected):
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if not hasattr(fragment, name):
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return 1.0, False
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return 1.0, getattr(fragment, name) == expected
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def _compare_re(self, fragment, name, arg):
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if name == 'fragment':
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group, minimum_weight = arg if type(arg) is tuple and len(arg) > 1 else (arg, 0)
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weight, match, num_fragments = self.capture_group.parser.matcher.fragment_match(fragment, group)
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return weight, weight > minimum_weight
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elif type(arg).__name__ == 'SRE_Pattern':
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return 1.0, arg.match(getattr(fragment, name)) is not None
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elif hasattr(fragment, name):
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match = self.capture_group.parser.matcher.value_match(getattr(fragment, name), arg, single=True)
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return 1.0, match is not None
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if not hasattr(fragment, name):
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raise ValueError("Unable to find fragment with name '%s'" % name)
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else:
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raise ValueError("Unexpected argument type")
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def execute(self, fragment):
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results = []
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total_weight = 0
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for name, method, argument in self.comparisons:
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weight, success = method(fragment, name, argument)
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total_weight += weight
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results.append(success)
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return total_weight / float(len(results)), all(results) if len(results) > 0 else False
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def __repr__(self):
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return "CaptureConstraint(comparisons=%s)" % repr(self.comparisons)
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