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SudachiPy/sudachipy/dictionarylib/doublearraylexicon.py
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# Copyright (c) 2019 Works Applications Co., Ltd. | |
# | |
# Licensed under the Apache License, Version 2.0 (the "License"); | |
# you may not use this file except in compliance with the License. | |
# You may obtain a copy of the License at | |
# | |
# http://www.apache.org/licenses/LICENSE-2.0 | |
# | |
# Unless required by applicable law or agreed to in writing, software | |
# distributed under the License is distributed on an "AS IS" BASIS, | |
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
# See the License for the specific language governing permissions and | |
# limitations under the License. | |
import mmap | |
from dartsclone import DoubleArray | |
from . import wordidtable | |
from . import wordinfolist | |
from . import wordparameterlist | |
from .lexicon import Lexicon | |
class DoubleArrayLexicon(Lexicon): | |
__SIGNED_SHORT_MIN = -32768 | |
__SIGNED_SHORT_MAX = 32767 | |
__USER_DICT_COST_PER_MORPH = -20 | |
trie = None | |
word_id_table = None | |
word_params = None | |
def __init__(self, bytes_: mmap.mmap, offset: int): | |
self.trie = DoubleArray() | |
bytes_.seek(offset) | |
size = int.from_bytes(bytes_.read(4), 'little') | |
offset += 4 | |
array = memoryview(bytes_)[offset:offset + size * 4] | |
self.trie.set_array(array, size) | |
offset += self.trie.total_size() | |
self.word_id_table = wordidtable.WordIdTable(bytes_, offset) | |
offset += self.word_id_table.storage_size() | |
self.word_params = wordparameterlist.WordParameterList(bytes_, offset) | |
offset += self.word_params.storage_size() | |
self.word_infos = wordinfolist.WordInfoList(bytes_, offset, self.word_params.get_size()) | |
def __del__(self): | |
del self.word_params | |
def lookup(self, text: bytes, offset: int) -> Lexicon.Itr: | |
key = text[offset:] | |
result = self.trie.common_prefix_search(key, length=len(key)) | |
for index, length in result: | |
word_ids = self.word_id_table.get(index) | |
length += offset | |
for word_id in word_ids: | |
yield (word_id, length) | |
def get_left_id(self, word_id: int) -> int: | |
return self.word_params.get_left_id(word_id) | |
def get_right_id(self, word_id: int) -> int: | |
return self.word_params.get_right_id(word_id) | |
def get_cost(self, word_id: int) -> int: | |
return self.word_params.get_cost(word_id) | |
def get_word_info(self, word_id: int) -> 'WordInfo': # noqa: F821 | |
return self.word_infos.get_word_info(word_id) | |
def size(self) -> int: | |
return self.word_params.size | |
def get_word_id(self, headword: str, pos_id: int, reading_form: str) -> int: | |
for wid in range(self.word_infos.size()): | |
info = self.word_infos.get_word_info(wid) | |
if info.surface == headword \ | |
and info.pos_id == pos_id \ | |
and info.reading_form == reading_form: | |
return wid | |
return -1 | |
def get_dictionary_id(self, word_id: int) -> int: | |
return 0 | |
def calculate_cost(self, tokenizer) -> None: | |
for wid in range(self.word_params.size): | |
if self.get_cost(wid) != self.__SIGNED_SHORT_MIN: | |
continue | |
surface = self.get_word_info(wid).surface | |
ms = tokenizer.tokenize(surface, None) | |
cost = ms.get_internal_cost() + self.__USER_DICT_COST_PER_MORPH * len(ms) | |
cost = min(cost, self.__SIGNED_SHORT_MAX) | |
cost = max(cost, self.__SIGNED_SHORT_MIN) | |
self.word_params.set_cost(wid, cost) |