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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"
#include "net/base/escape.h"
namespace {
const char kLeader[] = "$i18n";
const size_t kLeaderSize = arraysize(kLeader) - 1;
const char kKeyOpen = '{';
const char kKeyClose = '}';
} // namespace
namespace ui {
std::string ReplaceTemplateExpressions(
base::StringPiece source,
const TemplateReplacements& replacements) {
std::string formatted;
const size_t kValueLengthGuess = 16;
formatted.reserve(source.length() + replacements.size() * kValueLengthGuess);
// Two position markers are used as cursors through the |source|.
// The |current_pos| will follow behind |next_pos|.
size_t current_pos = 0;
while (true) {
size_t next_pos = source.find(kLeader, current_pos);
if (next_pos == std::string::npos) {
source.substr(current_pos).AppendToString(&formatted);
break;
}
source.substr(current_pos, next_pos - current_pos)
.AppendToString(&formatted);
current_pos = next_pos + kLeaderSize;
size_t context_end = source.find(kKeyOpen, current_pos);
CHECK_NE(context_end, std::string::npos);
std::string context;
source.substr(current_pos, context_end - current_pos)
.AppendToString(&context);
current_pos = context_end + sizeof(kKeyOpen);
size_t key_end = source.find(kKeyClose, current_pos);
CHECK_NE(key_end, std::string::npos);
std::string key =
source.substr(current_pos, key_end - current_pos).as_string();
CHECK(!key.empty());
TemplateReplacements::const_iterator value = replacements.find(key);
CHECK(value != replacements.end()) << "$i18n replacement key \"" << key
<< "\" not found";
std::string replacement = value->second;
if (context.empty()) {
// Make the replacement HTML safe.
replacement = net::EscapeForHTML(replacement);
} else if (context == "Raw") {
// Pass the replacement through unchanged.
} else {
CHECK(false) << "Unknown context " << context;
}
formatted.append(replacement);
current_pos = key_end + sizeof(kKeyClose);
}
return formatted;
}
} // namespace ui
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