69 lines
2.1 KiB
C++
69 lines
2.1 KiB
C++
/*
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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/test-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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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 std::unordered_set<char32>& delimiters) {
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const UnicodeText unicode_text = UTF8ToUnicodeText(text, /*do_copy=*/false);
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std::vector<Token> result;
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int token_start_codepoint = 0;
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auto token_start_it = unicode_text.begin();
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int codepoint_idx = 0;
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UnicodeText::const_iterator it;
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for (it = unicode_text.begin(); it < unicode_text.end(); it++) {
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if (delimiters.find(*it) != delimiters.end()) {
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// Only add a token when the string is non-empty.
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if (token_start_it != it) {
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result.push_back(Token{UnicodeText::UTF8Substring(token_start_it, it),
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token_start_codepoint, codepoint_idx});
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}
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token_start_codepoint = codepoint_idx + 1;
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token_start_it = it;
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token_start_it++;
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}
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codepoint_idx++;
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}
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// Only add a token when the string is non-empty.
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if (token_start_it != it) {
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result.push_back(Token{UnicodeText::UTF8Substring(token_start_it, it),
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token_start_codepoint, codepoint_idx});
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}
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return result;
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}
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} // namespace libtextclassifier3
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