mirror of
https://github.com/explosion/spaCy.git
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252 lines
6.8 KiB
Python
252 lines
6.8 KiB
Python
import pytest
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class Vocab(object):
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pass
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class Doc(list):
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def __init__(self, vocab, words=None):
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list.__init__(self)
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self.extend([Token(i, w) for i, w in enumerate(words)])
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class Token(object):
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def __init__(self, i, word):
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self.i = i
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self.text = word
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def find_matches(patterns, doc):
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init_states = [(pattern, 0, None) for pattern in patterns]
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curr_states = []
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matches = []
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for token in doc:
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nexts = []
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for state in (curr_states + init_states):
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matches, nexts = transition(state, token, matches, nexts)
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curr_states = nexts
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return matches
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def transition(state, token, matches, nexts):
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action = get_action(state, token)
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is_match, keep_state, advance_state = [bool(int(c)) for c in action]
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pattern, i, start = state
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if start is None:
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start = token.i
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if is_match:
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matches.append((pattern, start, token.i+1))
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if advance_state:
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nexts.append((pattern, i+1, start))
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if keep_state:
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# TODO: This needs to be zero-width :(.
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nexts.append((pattern, i, start))
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return (matches, nexts)
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def get_action(state, token):
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'''We need to consider:
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a) Does the token match the specification? [Yes, No]
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b) What's the quantifier? [1, 0+, ?]
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c) Is this the last specification? [final, non-final]
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We can transition in the following ways:
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a) Do we emit a match?
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b) Do we add a state with (next state, next token)?
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c) Do we add a state with (next state, same token)?
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d) Do we add a state with (same state, next token)?
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We'll code the actions as boolean strings, so 0000 means no to all 4,
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1000 means match but no states added, etc.
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1:
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Yes, final:
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1000
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Yes, non-final:
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0100
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No, final:
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0000
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No, non-final
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0000
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0+:
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Yes, final:
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1001
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Yes, non-final:
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0111
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No, final:
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1000 (note: Don't include last token!)
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No, non-final:
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0010
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?:
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Yes, final:
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1000
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Yes, non-final:
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0100
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No, final:
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1000 (note: Don't include last token!)
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No, non-final:
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0010
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Problem: If a quantifier is matching, we're adding a lot of open partials
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'''
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is_match = get_is_match(state, token)
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operator = get_operator(state, token)
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is_final = get_is_final(state, token)
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raise NotImplementedError
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def get_is_match(state, token):
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pattern, i, start = state
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is_match = token.text == pattern[i]['spec']
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if pattern[i].get('invert'):
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return not is_match
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else:
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return is_match
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def get_is_final(state, token):
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pattern, i, start = state
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return i == len(pattern)-1
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def get_operator(state, token):
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pattern, i, start = state
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return pattern[i].get('op', '1')
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########################
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# Tests for get_action #
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########################
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def test_get_action_simple_match():
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pattern = [{'spec': 'a', 'op': '1'}]
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doc = Doc(Vocab(), words=['a'])
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state = (pattern, 0, None)
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action = get_action(state, doc[0])
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assert action == '100'
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def test_get_action_simple_reject():
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pattern = [{'spec': 'b', 'op': '1'}]
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doc = Doc(Vocab(), words=['a'])
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state = (pattern, 0, None)
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action = get_action(state, doc[0])
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assert action == '000'
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def test_get_action_simple_match_match():
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pattern = [{'spec': 'a', 'op': '1'}, {'spec': 'a', 'op': '1'}]
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doc = Doc(Vocab(), words=['a', 'a'])
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state = (pattern, 0, None)
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action = get_action(state, doc[0])
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assert action == '001'
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state = (pattern, 1, 0)
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action = get_action(state, doc[1])
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assert action == '100'
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def test_get_action_simple_match_reject():
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pattern = [{'spec': 'a', 'op': '1'}, {'spec': 'b', 'op': '1'}]
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doc = Doc(Vocab(), words=['a', 'a'])
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state = (pattern, 0, None)
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action = get_action(state, doc[0])
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assert action == '001'
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state = (pattern, 1, 0)
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action = get_action(state, doc[1])
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assert action == '000'
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def test_get_action_simple_match_reject():
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pattern = [{'spec': 'a', 'op': '1'}, {'spec': 'b', 'op': '1'}]
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doc = Doc(Vocab(), words=['a', 'a'])
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state = (pattern, 0, None)
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action = get_action(state, doc[0])
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assert action == '001'
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state = (pattern, 1, 0)
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action = get_action(state, doc[1])
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assert action == '000'
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def test_get_action_plus_match():
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pattern = [{'spec': 'a', 'op': '1+'}]
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doc = Doc(Vocab(), words=['a'])
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state = (pattern, 0, None)
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action = get_action(state, doc[0])
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assert action == '110'
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def test_get_action_plus_match_match():
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pattern = [{'spec': 'a', 'op': '1+'}]
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doc = Doc(Vocab(), words=['a', 'a'])
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state = (pattern, 0, None)
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action = get_action(state, doc[0])
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assert action == '110'
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state = (pattern, 0, 0)
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action = get_action(state, doc[1])
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assert action == '110'
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##########################
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# Tests for find_matches #
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##########################
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def test_find_matches_simple_accept():
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pattern = [{'spec': 'a', 'op': '1'}]
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doc = Doc(Vocab(), words=['a'])
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matches = find_matches([pattern], doc)
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assert matches == [(pattern, 0, 1)]
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def test_find_matches_simple_reject():
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pattern = [{'spec': 'a', 'op': '1'}]
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doc = Doc(Vocab(), words=['b'])
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matches = find_matches([pattern], doc)
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assert matches == []
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def test_find_matches_match_twice():
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pattern = [{'spec': 'a', 'op': '1'}]
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doc = Doc(Vocab(), words=['a', 'a'])
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matches = find_matches([pattern], doc)
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assert matches == [(pattern, 0, 1), (pattern, 1, 2)]
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def test_find_matches_longer_pattern():
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pattern = [{'spec': 'a', 'op': '1'}, {'spec': 'b', 'op': '1'}]
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doc = Doc(Vocab(), words=['a', 'b'])
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matches = find_matches([pattern], doc)
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assert matches == [(pattern, 0, 2)]
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def test_find_matches_two_patterns():
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patterns = [[{'spec': 'a', 'op': '1'}], [{'spec': 'b', 'op': '1'}]]
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doc = Doc(Vocab(), words=['a', 'b'])
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matches = find_matches(patterns, doc)
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assert matches == [(patterns[0], 0, 1), (patterns[1], 1, 2)]
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def test_find_matches_two_patterns_overlap():
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patterns = [[{'spec': 'a'}, {'spec': 'b'}],
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[{'spec': 'b'}, {'spec': 'c'}]]
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doc = Doc(Vocab(), words=['a', 'b', 'c'])
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matches = find_matches(patterns, doc)
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assert matches == [(patterns[0], 0, 2), (patterns[1], 1, 3)]
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def test_find_matches_greedy():
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patterns = [[{'spec': 'a', 'op': '1+'}]]
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doc = Doc(Vocab(), words=['a'])
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matches = find_matches(patterns, doc)
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assert matches == [(patterns[0], 0, 1)]
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doc = Doc(Vocab(), words=['a', 'a'])
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matches = find_matches(patterns, doc)
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assert matches == [(patterns[0], 0, 1), (patterns[0], 0, 2), (patterns[0], 1, 2)]
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def test_find_matches_non_greedy():
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patterns = [[{'spec': 'a', 'op': '0+'}, {'spec': 'b', "op": "1"}]]
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doc = Doc(Vocab(), words=['b'])
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matches = find_matches(patterns, doc)
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assert matches == [(patterns[0], 0, 1)]
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