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// 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
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