escape_for_html.cpp

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/*
 * Copyright 2023 MusicScience37 (Kenta Kabashima)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include "stat_bench/util/escape_for_html.h"
 
#include <cstddef>
#include <string>
#include <string_view>
 
namespace stat_bench {
namespace util {
 
auto escape_for_html(const StringView& input) -> std::string {
    const auto input_view = std::string_view(input.data(), input.size());
    std::string output;
    // Heuristics to prevent resize.
    const std::size_t reserved_size =
        input_view.size() + input_view.size() / 5U;
    output.reserve(reserved_size);
    for (const char c : input_view) {
        switch (c) {
        case '&':
            output.append("&amp;");
            break;
        case '<':
            output.append("&lt;");
            break;
        case '>':
            output.append("&gt;");
            break;
        case '\"':
            output.append("&quot;");
            break;
        case '\'':
            output.append("&#x27;");
            break;
        default:
            output.push_back(c);
        }
    }
    return output;
}
 
}  // namespace util
}  // namespace stat_bench