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Fix #588: Matcher should reject empty pattern.

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This commit is contained in:
Matthew Honnibal 2016-11-03 00:16:44 +01:00
parent 72b9bd57ec
commit f1605df2ec
1 changed files with 6 additions and 0 deletions
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6
spacy/matcher.pyx
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@ -273,6 +273,12 @@ cdef class Matcher:
Returns:
None
"""
token_specs = list(token_specs)
if len(token_specs) == 0:
msg = ("Cannot add pattern for zero tokens to matcher.\n"
"entity_key: {entity_key}\n"
"label: {label}")
raise ValueError(msg.format(entity_key=entity_key, label=label))
entity_key = self.normalize_entity_key(entity_key)
if not self.has_entity(entity_key):
self.add_entity(entity_key)