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208 lines
8.1 KiB
Cython
208 lines
8.1 KiB
Cython
# cython: infer_types
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from libc.string cimport memset
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import srsly
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from collections import Counter
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import numpy
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import warnings
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from .attrs cimport POS, IS_SPACE
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from .parts_of_speech cimport SPACE
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from .lexeme cimport Lexeme
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from .strings import get_string_id
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from .attrs import LEMMA, intify_attrs
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from .parts_of_speech import IDS as POS_IDS
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from .errors import Errors, Warnings
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from .util import ensure_path
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from . import symbols
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cdef class Morphology:
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"""Store the possible morphological analyses for a language, and index them
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by hash.
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To save space on each token, tokens only know the hash of their
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morphological analysis, so queries of morphological attributes are delegated
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to this class.
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"""
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FEATURE_SEP = "|"
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FIELD_SEP = "="
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VALUE_SEP = ","
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# not an empty string so we can distinguish unset morph from empty morph
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EMPTY_MORPH = symbols.NAMES[symbols._]
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def __init__(self, StringStore strings):
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self.mem = Pool()
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self.strings = strings
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self.tags = PreshMap()
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def __reduce__(self):
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tags = set([self.get(self.strings[s]) for s in self.strings])
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tags -= set([""])
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return (unpickle_morphology, (self.strings, sorted(tags)), None, None)
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def add(self, features):
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"""Insert a morphological analysis in the morphology table, if not
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already present. The morphological analysis may be provided in the UD
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FEATS format as a string or in the tag map dict format.
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Returns the hash of the new analysis.
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"""
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cdef MorphAnalysisC* tag_ptr
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if isinstance(features, str):
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if features == "":
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features = self.EMPTY_MORPH
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tag_ptr = <MorphAnalysisC*>self.tags.get(<hash_t>self.strings[features])
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if tag_ptr != NULL:
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return tag_ptr.key
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features = self.feats_to_dict(features)
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if not isinstance(features, dict):
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warnings.warn(Warnings.W100.format(feature=features))
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features = {}
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string_features = {self.strings.as_string(field): self.strings.as_string(values) for field, values in features.items()}
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# intified ("Field", "Field=Value") pairs
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field_feature_pairs = []
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for field in sorted(string_features):
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values = string_features[field]
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for value in values.split(self.VALUE_SEP):
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field_feature_pairs.append((
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self.strings.add(field),
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self.strings.add(field + self.FIELD_SEP + value),
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))
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cdef MorphAnalysisC tag = self.create_morph_tag(field_feature_pairs)
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# the hash key for the tag is either the hash of the normalized UFEATS
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# string or the hash of an empty placeholder
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norm_feats_string = self.normalize_features(features)
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tag.key = self.strings.add(norm_feats_string)
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self.insert(tag)
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return tag.key
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def normalize_features(self, features):
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"""Create a normalized FEATS string from a features string or dict.
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features (Union[dict, str]): Features as dict or UFEATS string.
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RETURNS (str): Features as normalized UFEATS string.
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"""
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if isinstance(features, str):
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features = self.feats_to_dict(features)
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if not isinstance(features, dict):
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warnings.warn(Warnings.W100.format(feature=features))
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features = {}
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features = self.normalize_attrs(features)
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string_features = {self.strings.as_string(field): self.strings.as_string(values) for field, values in features.items()}
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# normalized UFEATS string with sorted fields and values
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norm_feats_string = self.FEATURE_SEP.join(sorted([
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self.FIELD_SEP.join([field, values])
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for field, values in string_features.items()
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]))
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return norm_feats_string or self.EMPTY_MORPH
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def normalize_attrs(self, attrs):
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"""Convert attrs dict so that POS is always by ID, other features are
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by string. Values separated by VALUE_SEP are sorted.
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"""
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out = {}
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attrs = dict(attrs)
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for key, value in attrs.items():
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# convert POS value to ID
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if key == POS or (isinstance(key, str) and key.upper() == "POS"):
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if isinstance(value, str) and value.upper() in POS_IDS:
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value = POS_IDS[value.upper()]
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elif isinstance(value, int) and value not in POS_IDS.values():
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warnings.warn(Warnings.W100.format(feature={key: value}))
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continue
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out[POS] = value
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# accept any string or ID fields and values and convert to strings
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elif isinstance(key, (int, str)) and isinstance(value, (int, str)):
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key = self.strings.as_string(key)
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value = self.strings.as_string(value)
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# sort values
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if self.VALUE_SEP in value:
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value = self.VALUE_SEP.join(sorted(value.split(self.VALUE_SEP)))
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out[key] = value
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else:
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warnings.warn(Warnings.W100.format(feature={key: value}))
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return out
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cdef MorphAnalysisC create_morph_tag(self, field_feature_pairs) except *:
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"""Creates a MorphAnalysisC from a list of intified
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("Field", "Field=Value") tuples where fields with multiple values have
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been split into individual tuples, e.g.:
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[("Field1", "Field1=Value1"), ("Field1", "Field1=Value2"),
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("Field2", "Field2=Value3")]
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"""
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cdef MorphAnalysisC tag
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tag.length = len(field_feature_pairs)
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if tag.length > 0:
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tag.fields = <attr_t*>self.mem.alloc(tag.length, sizeof(attr_t))
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tag.features = <attr_t*>self.mem.alloc(tag.length, sizeof(attr_t))
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for i, (field, feature) in enumerate(field_feature_pairs):
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tag.fields[i] = field
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tag.features[i] = feature
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return tag
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cdef int insert(self, MorphAnalysisC tag) except -1:
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cdef hash_t key = tag.key
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if self.tags.get(key) == NULL:
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tag_ptr = <MorphAnalysisC*>self.mem.alloc(1, sizeof(MorphAnalysisC))
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tag_ptr[0] = tag
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self.tags.set(key, <void*>tag_ptr)
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def get(self, hash_t morph):
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tag = <MorphAnalysisC*>self.tags.get(morph)
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if tag == NULL:
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return ""
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else:
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return self.strings[tag.key]
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@staticmethod
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def feats_to_dict(feats):
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if not feats or feats == Morphology.EMPTY_MORPH:
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return {}
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return {field: Morphology.VALUE_SEP.join(sorted(values.split(Morphology.VALUE_SEP))) for field, values in
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[feat.split(Morphology.FIELD_SEP) for feat in feats.split(Morphology.FEATURE_SEP)]}
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@staticmethod
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def dict_to_feats(feats_dict):
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if len(feats_dict) == 0:
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return ""
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return Morphology.FEATURE_SEP.join(sorted([Morphology.FIELD_SEP.join([field, Morphology.VALUE_SEP.join(sorted(values.split(Morphology.VALUE_SEP)))]) for field, values in feats_dict.items()]))
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cdef int check_feature(const MorphAnalysisC* morph, attr_t feature) nogil:
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cdef int i
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for i in range(morph.length):
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if morph.features[i] == feature:
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return True
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return False
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cdef list list_features(const MorphAnalysisC* morph):
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cdef int i
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features = []
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for i in range(morph.length):
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features.append(morph.features[i])
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return features
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cdef np.ndarray get_by_field(const MorphAnalysisC* morph, attr_t field):
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cdef np.ndarray results = numpy.zeros((morph.length,), dtype="uint64")
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n = get_n_by_field(<uint64_t*>results.data, morph, field)
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return results[:n]
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cdef int get_n_by_field(attr_t* results, const MorphAnalysisC* morph, attr_t field) nogil:
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cdef int n_results = 0
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cdef int i
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for i in range(morph.length):
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if morph.fields[i] == field:
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results[n_results] = morph.features[i]
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n_results += 1
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return n_results
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def unpickle_morphology(strings, tags):
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cdef Morphology morphology = Morphology(strings)
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for tag in tags:
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morphology.add(tag)
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return morphology
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