| // Copyright 2015 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "ui/base/template_expressions.h" |
| |
| #include <stddef.h> |
| |
| #include "base/logging.h" |
| |
| namespace { |
| const char kLeader[] = "$i18n{"; |
| const size_t kLeaderSize = arraysize(kLeader) - 1; |
| const char kTail[] = "}"; |
| const size_t kTailSize = arraysize(kTail) - 1; |
| } // namespace |
| |
| namespace ui { |
| |
| std::string ReplaceTemplateExpressions( |
| base::StringPiece source, |
| const TemplateReplacements& replacements) { |
| std::string formatted; |
| const size_t kValueLengthGuess = 16; |
| formatted.reserve(source.length() + replacements.size() * kValueLengthGuess); |
| // Two position markers are used as cursors through the |source|. |
| // The |current_pos| will follow behind |next_pos|. |
| size_t current_pos = 0; |
| while (true) { |
| size_t next_pos = source.find(kLeader, current_pos); |
| |
| if (next_pos == std::string::npos) { |
| source.substr(current_pos).AppendToString(&formatted); |
| break; |
| } |
| |
| source.substr(current_pos, next_pos - current_pos) |
| .AppendToString(&formatted); |
| current_pos = next_pos + kLeaderSize; |
| |
| size_t key_end = source.find(kTail, current_pos); |
| CHECK_NE(key_end, std::string::npos); |
| |
| std::string key = |
| source.substr(current_pos, key_end - current_pos).as_string(); |
| CHECK(!key.empty()); |
| |
| TemplateReplacements::const_iterator replacement = replacements.find(key); |
| CHECK(replacement != replacements.end()); |
| formatted.append(replacement->second); |
| |
| current_pos = key_end + kTailSize; |
| } |
| return formatted; |
| } |
| |
| } // namespace ui |