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// Copyright (c) 2021 Xingchen Song sxc19@mails.tsinghua.edu.cn
// 2023 Jing Du (thuduj12@163.com)
//
// 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
#include "post_processor/post_processor.h"
#include <sstream>
#include <vector>
#include "utils/string.h"
namespace wenet {
std::string PostProcessor::ProcessSpace(const std::string& str) { std::string result = str; // 1. remove ' ' if needed
// only spaces between mandarin words need to be removed, please note that
// if str contains '_', we assume that the decoding type must be
// `CtcPrefixBeamSearch` and this branch will do nothing since str must be
// obtained via "".join() (in function `AsrDecoder::UpdateResult()`)
if (opts_.language_type == kMandarinEnglish && !str.empty()) { result.clear(); // split str by ' '
std::vector<std::string> words; std::stringstream ss(str); std::string tmp; while (ss >> tmp) { words.push_back(tmp); } // check english word
bool is_englishword_prev = false; bool is_englishword_now = false; for (std::string& w : words) { is_englishword_now = CheckEnglishWord(w); if (is_englishword_prev && is_englishword_now) { result += (' ' + w); } else { result += (w); } is_englishword_prev = is_englishword_now; } } // 2. replace '_' with ' '
// this should be done for all cases (both kMandarinEnglish and kIndoEuropean)
result = ProcessBlank(result, opts_.lowercase); return result;}
std::string del_substr(const std::string& str, const std::string& sub) { std::string result = str; int pos = 0; while (string::npos != (pos = result.find(sub))) { result.erase(pos, sub.size()); } return result;}
std::string PostProcessor::ProcessSymbols(const std::string& str) { std::string result = str; result = del_substr(result, "<unk>"); result = del_substr(result, "<context>"); result = del_substr(result, "</context>"); return result;}
std::string PostProcessor::Process(const std::string& str, bool finish) { std::string result; // remove symbols with "<>" first
result = ProcessSymbols(str); result = ProcessSpace(result); // TODO(xcsong): do punctuation if finish == true
// if (finish == true && opts_.itn) {
// if (nullptr != itn_resource) {
// result = itn_resource->Normalize(result);
// }
// }
return result;}
} // namespace wenet
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