mirror of
https://github.com/SerenityOS/serenity
synced 2024-07-22 02:26:11 +00:00
327 lines
8.2 KiB
C++
327 lines
8.2 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/JsonArray.h>
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#include <AK/JsonObject.h>
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#include <AK/JsonParser.h>
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#include <AK/Memory.h>
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namespace AK {
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static inline bool is_whitespace(char ch)
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{
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return ch == ' ' || ch == '\n' || ch == '\t' || ch == '\v' || ch == '\r';
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}
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char JsonParser::peek() const
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{
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if (m_index < m_input.length())
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return m_input[m_index];
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return '\0';
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}
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char JsonParser::consume()
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{
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if (m_index < m_input.length())
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return m_input[m_index++];
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return '\0';
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}
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template<typename C>
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void JsonParser::consume_while(C condition)
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{
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while (condition(peek()))
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consume();
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}
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void JsonParser::consume_whitespace()
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{
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consume_while([](char ch) { return is_whitespace(ch); });
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}
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void JsonParser::consume_specific(char expected_ch)
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{
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char consumed_ch = consume();
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ASSERT(consumed_ch == expected_ch);
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}
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String JsonParser::consume_quoted_string()
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{
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consume_specific('"');
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Vector<char, 1024> buffer;
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for (;;) {
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size_t peek_index = m_index;
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char ch = 0;
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for (;;) {
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if (peek_index == m_input.length())
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break;
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ch = m_input[peek_index];
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if (ch == '"' || ch == '\\')
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break;
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++peek_index;
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}
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if (peek_index != m_index) {
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buffer.append(m_input.characters_without_null_termination() + m_index, peek_index - m_index);
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m_index = peek_index;
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}
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if (m_index == m_input.length())
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break;
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if (ch == '"')
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break;
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if (ch != '\\') {
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buffer.append(consume());
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continue;
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}
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consume();
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char escaped_ch = consume();
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switch (escaped_ch) {
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case 'n':
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buffer.append('\n');
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break;
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case 'r':
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buffer.append('\r');
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break;
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case 't':
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buffer.append('\t');
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break;
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case 'b':
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buffer.append('\b');
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break;
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case 'f':
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buffer.append('\f');
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break;
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case 'u': {
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StringBuilder sb;
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sb.append(consume());
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sb.append(consume());
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sb.append(consume());
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sb.append(consume());
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bool ok;
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u32 codepoint = AK::StringUtils::convert_to_uint_from_hex(sb.to_string(), ok);
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if (ok && codepoint < 128) {
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buffer.append((char)codepoint);
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} else {
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// FIXME: This is obviously not correct, but we don't have non-ASCII support so meh.
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buffer.append('?');
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}
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} break;
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default:
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buffer.append(escaped_ch);
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break;
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}
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}
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consume_specific('"');
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if (buffer.is_empty())
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return String::empty();
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auto& last_string_starting_with_character = m_last_string_starting_with_character[(u8)buffer.first()];
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if (last_string_starting_with_character.length() == buffer.size()) {
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if (!memcmp(last_string_starting_with_character.characters(), buffer.data(), buffer.size()))
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return last_string_starting_with_character;
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}
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last_string_starting_with_character = String::copy(buffer);
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return last_string_starting_with_character;
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}
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JsonObject JsonParser::parse_object()
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{
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JsonObject object;
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consume_specific('{');
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for (;;) {
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consume_whitespace();
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if (peek() == '}')
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break;
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consume_whitespace();
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auto name = consume_quoted_string();
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consume_whitespace();
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consume_specific(':');
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consume_whitespace();
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auto value = parse();
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object.set(name, move(value));
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consume_whitespace();
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if (peek() == '}')
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break;
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consume_specific(',');
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}
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consume_specific('}');
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return object;
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}
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JsonArray JsonParser::parse_array()
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{
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JsonArray array;
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consume_specific('[');
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for (;;) {
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consume_whitespace();
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if (peek() == ']')
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break;
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array.append(parse());
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consume_whitespace();
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if (peek() == ']')
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break;
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consume_specific(',');
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}
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consume_whitespace();
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consume_specific(']');
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return array;
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}
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JsonValue JsonParser::parse_string()
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{
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return consume_quoted_string();
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}
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JsonValue JsonParser::parse_number()
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{
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bool ok;
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JsonValue value;
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Vector<char, 128> number_buffer;
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Vector<char, 128> fraction_buffer;
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bool is_double = false;
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for (;;) {
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char ch = peek();
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if (ch == '.') {
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is_double = true;
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++m_index;
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continue;
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}
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if (ch == '-' || (ch >= '0' && ch <= '9')) {
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if (is_double)
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fraction_buffer.append(ch);
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else
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number_buffer.append(ch);
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++m_index;
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continue;
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}
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break;
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}
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StringView number_string(number_buffer.data(), number_buffer.size());
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StringView fraction_string(fraction_buffer.data(), fraction_buffer.size());
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#ifndef KERNEL
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if (is_double) {
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int whole = number_string.to_uint(ok);
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if (!ok)
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whole = number_string.to_int(ok);
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ASSERT(ok);
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int fraction = fraction_string.to_uint(ok);
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fraction *= (whole < 0) ? -1 : 1;
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ASSERT(ok);
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auto divider = 1;
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for (size_t i = 0; i < fraction_buffer.size(); ++i) {
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divider *= 10;
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}
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value = JsonValue((double)whole + ((double)fraction / divider));
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} else {
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#endif
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value = JsonValue(number_string.to_uint(ok));
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if (!ok)
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value = JsonValue(number_string.to_int(ok));
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ASSERT(ok);
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#ifndef KERNEL
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}
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#endif
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return value;
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}
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void JsonParser::consume_string(const char* str)
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{
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for (size_t i = 0, length = strlen(str); i < length; ++i)
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consume_specific(str[i]);
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}
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JsonValue JsonParser::parse_true()
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{
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consume_string("true");
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return JsonValue(true);
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}
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JsonValue JsonParser::parse_false()
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{
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consume_string("false");
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return JsonValue(false);
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}
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JsonValue JsonParser::parse_null()
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{
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consume_string("null");
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return JsonValue(JsonValue::Type::Null);
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}
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JsonValue JsonParser::parse_undefined()
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{
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consume_string("undefined");
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return JsonValue(JsonValue::Type::Undefined);
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}
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JsonValue JsonParser::parse()
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{
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consume_whitespace();
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auto type_hint = peek();
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switch (type_hint) {
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case '{':
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return parse_object();
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case '[':
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return parse_array();
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case '"':
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return parse_string();
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case '-':
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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return parse_number();
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case 'f':
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return parse_false();
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case 't':
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return parse_true();
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case 'n':
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return parse_null();
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case 'u':
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return parse_undefined();
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}
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return JsonValue();
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}
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}
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