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75 lines
2.3 KiB
75 lines
2.3 KiB
1 week ago
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from typing import Iterator, Tuple, Union
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from ...errors import Errors
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from ...symbols import NOUN, PRON, PROPN
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from ...tokens import Doc, Span
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def noun_chunks(doclike: Union[Doc, Span]) -> Iterator[Tuple[int, int, int]]:
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"""
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Detect base noun phrases from a dependency parse for Haitian Creole.
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Works on both Doc and Span objects.
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"""
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# Core nominal dependencies common in Haitian Creole
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labels = [
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"nsubj",
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"obj",
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"obl",
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"nmod",
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"appos",
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"ROOT",
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]
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# Modifiers to optionally include in chunk (to the right)
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post_modifiers = ["compound", "flat", "flat:name", "fixed"]
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doc = doclike.doc
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if not doc.has_annotation("DEP"):
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raise ValueError(Errors.E029)
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np_deps = {doc.vocab.strings.add(label) for label in labels}
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np_mods = {doc.vocab.strings.add(mod) for mod in post_modifiers}
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conj_label = doc.vocab.strings.add("conj")
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np_label = doc.vocab.strings.add("NP")
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adp_pos = doc.vocab.strings.add("ADP")
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cc_pos = doc.vocab.strings.add("CCONJ")
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prev_end = -1
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for i, word in enumerate(doclike):
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if word.pos not in (NOUN, PROPN, PRON):
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continue
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if word.left_edge.i <= prev_end:
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continue
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if word.dep in np_deps:
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right_end = word
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# expand to include known modifiers to the right
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for child in word.rights:
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if child.dep in np_mods:
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right_end = child.right_edge
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elif child.pos == NOUN:
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right_end = child.right_edge
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left_index = word.left_edge.i
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# Skip prepositions at the start
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if word.left_edge.pos == adp_pos:
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left_index += 1
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prev_end = right_end.i
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yield left_index, right_end.i + 1, np_label
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elif word.dep == conj_label:
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head = word.head
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while head.dep == conj_label and head.head.i < head.i:
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head = head.head
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if head.dep in np_deps:
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left_index = word.left_edge.i
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if word.left_edge.pos == cc_pos:
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left_index += 1
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prev_end = word.i
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yield left_index, word.i + 1, np_label
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SYNTAX_ITERATORS = {"noun_chunks": noun_chunks}
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