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73 lines
2.5 KiB
73 lines
2.5 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/zlib/zlib_regex.h"
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#include <memory>
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#include "utils/base/logging.h"
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#include "utils/flatbuffers/flatbuffers.h"
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#include "utils/utf8/unicodetext.h"
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namespace libtextclassifier3 {
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std::unique_ptr<UniLib::RegexPattern> UncompressMakeRegexPattern(
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const UniLib& unilib, const flatbuffers::String* uncompressed_pattern,
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const CompressedBuffer* compressed_pattern, bool lazy_compile_regex,
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ZlibDecompressor* decompressor, std::string* result_pattern_text) {
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UnicodeText unicode_regex_pattern;
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std::string decompressed_pattern;
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if (compressed_pattern != nullptr &&
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compressed_pattern->buffer() != nullptr) {
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if (decompressor == nullptr ||
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!decompressor->MaybeDecompress(compressed_pattern,
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&decompressed_pattern)) {
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TC3_LOG(ERROR) << "Cannot decompress pattern.";
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return nullptr;
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}
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unicode_regex_pattern =
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UTF8ToUnicodeText(decompressed_pattern.data(),
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decompressed_pattern.size(), /*do_copy=*/false);
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} else {
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if (uncompressed_pattern == nullptr) {
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TC3_LOG(ERROR) << "Cannot load uncompressed pattern.";
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return nullptr;
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}
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unicode_regex_pattern =
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UTF8ToUnicodeText(uncompressed_pattern->c_str(),
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uncompressed_pattern->size(), /*do_copy=*/false);
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}
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if (result_pattern_text != nullptr) {
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*result_pattern_text = unicode_regex_pattern.ToUTF8String();
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}
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std::unique_ptr<UniLib::RegexPattern> regex_pattern;
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if (lazy_compile_regex) {
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regex_pattern = unilib.CreateLazyRegexPattern(unicode_regex_pattern);
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} else {
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regex_pattern = unilib.CreateRegexPattern(unicode_regex_pattern);
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}
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if (!regex_pattern) {
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TC3_LOG(ERROR) << "Could not create pattern: "
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<< unicode_regex_pattern.ToUTF8String();
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}
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return regex_pattern;
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}
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} // namespace libtextclassifier3
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