serenity/AK/JsonParser.h

/*
 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include <AK/JsonValue.h>

namespace AK {

class JsonParser {
public:
    explicit JsonParser(const StringView& input)
        : m_input(input)
    {
    }
    ~JsonParser()
    {
    }

    JsonValue parse();

private:
    char peek() const;
    char consume();
    void consume_whitespace();
    void consume_specific(char expected_ch);
    void consume_string(const char*);
    String consume_quoted_string();
    JsonArray parse_array();
    JsonObject parse_object();
    JsonValue parse_number();
    JsonValue parse_string();
    JsonValue parse_false();
    JsonValue parse_true();
    JsonValue parse_null();
    JsonValue parse_undefined();

    template<typename C>
    void consume_while(C);

    StringView m_input;
    size_t m_index { 0 };

    String m_last_string_starting_with_character[256];
};

}

using AK::JsonParser;