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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 ui {
std::string ReplaceTemplateExpressions(
base::StringPiece format_string,
const std::map<base::StringPiece, std::string>& substitutions) {
std::string formatted;
const size_t kValueLengthGuess = 16;
formatted.reserve(format_string.length() +
substitutions.size() * kValueLengthGuess);
base::StringPiece::const_iterator i = format_string.begin();
while (i < format_string.end()) {
if (*i == '$' && i + 2 < format_string.end() && i[1] == '{' &&
i[2] != '}') {
size_t key_start = i + strlen("${") - format_string.begin();
size_t key_length = format_string.find('}', key_start);
if (key_length == base::StringPiece::npos)
NOTREACHED() << "TemplateExpression missing ending brace '}'";
key_length -= key_start;
base::StringPiece key(format_string.begin() + key_start, key_length);
const auto& replacement = substitutions.find(key);
if (replacement != substitutions.end()) {
formatted.append(replacement->second);
i += strlen("${") + key_length + strlen("}");
continue;
} else {
NOTREACHED() << "TemplateExpression key not found: " << key;
}
}
formatted.push_back(*i);
++i;
}
return formatted;
}
} // namespace ui
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