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92 lines
2.6 KiB
92 lines
2.6 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/strings/substitute.h"
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#include <algorithm>
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#include "utils/base/logging.h"
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namespace libtextclassifier3 {
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namespace strings {
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bool Substitute(const StringPiece format, const std::vector<StringPiece>& args,
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std::string* output) {
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// Determine total size needed.
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size_t size = 0;
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for (size_t i = 0; i < format.size(); i++) {
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if (format[i] == '$') {
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if (i + 1 >= format.size()) {
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TC3_LOG(ERROR) << "Invalid format string: " << format.ToString();
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return false;
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} else if (isdigit(format[i + 1])) {
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int index = format[i + 1] - '0';
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if (static_cast<size_t>(index) >= args.size()) {
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TC3_LOG(ERROR) << "Asked for " << index << ", but only "
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<< args.size() << " arguments given";
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return false;
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}
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size += args[index].size();
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++i; // Skip next char.
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} else if (format[i + 1] == '$') {
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++size;
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++i; // Skip next char.
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} else {
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TC3_LOG(ERROR) << "Invalid format string: " << format.ToString();
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return false;
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}
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} else {
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++size;
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}
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}
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if (size == 0) {
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output->clear();
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return true;
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}
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// Build the string.
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output->resize(size);
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char* target = &(*output)[0];
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for (size_t i = 0; i < format.size(); i++) {
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if (format[i] == '$') {
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if (isdigit(format[i + 1])) {
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const StringPiece src = args[format[i + 1] - '0'];
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target = std::copy(src.data(), src.data() + src.size(), target);
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++i; // Skip next char.
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} else if (format[i + 1] == '$') {
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*target++ = '$';
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++i; // Skip next char.
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}
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} else {
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*target++ = format[i];
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}
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}
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return true;
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}
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std::string Substitute(const StringPiece format,
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const std::vector<StringPiece>& args) {
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std::string result;
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if (!Substitute(format, args, &result)) {
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return "";
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}
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return result;
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}
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} // namespace strings
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} // namespace libtextclassifier3
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