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57 lines
1.9 KiB
57 lines
1.9 KiB
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "utils/tokenizer-utils.h"
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#include <iterator>
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#include "utils/codepoint-range.h"
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#include "utils/strings/utf8.h"
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#include "utils/utf8/unicodetext.h"
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#include "utils/utf8/unilib-common.h"
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#include "absl/container/flat_hash_set.h"
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namespace libtextclassifier3 {
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using libtextclassifier3::Token;
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std::vector<Token> TokenizeOnSpace(const std::string& text) {
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return TokenizeOnDelimiters(text, {' '});
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}
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std::vector<Token> TokenizeOnDelimiters(
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const std::string& text, const absl::flat_hash_set<char32>& delimiters,
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bool create_tokens_for_non_space_delimiters) {
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return TokenizeWithFilter(text, [&](char32 codepoint) {
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bool to_split = delimiters.find(codepoint) != delimiters.end();
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bool to_keep =
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(create_tokens_for_non_space_delimiters) ? codepoint != ' ' : false;
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return FilterResult{to_split, to_keep};
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});
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}
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std::vector<Token> TokenizeOnWhiteSpacePunctuationAndChineseLetter(
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const absl::string_view text) {
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return TokenizeWithFilter(text, [](char32 codepoint) {
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bool is_whitespace = IsWhitespace(codepoint);
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bool to_split =
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is_whitespace || IsPunctuation(codepoint) || IsChineseLetter(codepoint);
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bool to_keep = !is_whitespace;
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return FilterResult{to_split, to_keep};
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});
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}
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} // namespace libtextclassifier3
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