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ladybird/AK/JsonParser.cpp
Nico Weber ce95628b7f Unicode: Try s/codepoint/code_point/g again 
This time, without trailing 's'. Ran:

    git grep -l 'codepoint' | xargs sed -ie 's/codepoint/code_point/g
2020-08-05 22:33:42 +02:00

360 lines
9 KiB
C++
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/*
* 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.
*/
#include <AK/JsonArray.h>
#include <AK/JsonObject.h>
#include <AK/JsonParser.h>
#include <AK/Memory.h>
namespace AK {
static inline bool is_whitespace(char ch)
{
return ch == ' ' || ch == '\n' || ch == '\t' || ch == '\v' || ch == '\r';
}
char JsonParser::peek() const
{
if (m_index < m_input.length())
return m_input[m_index];
return '\0';
}
char JsonParser::consume()
{
if (m_index < m_input.length())
return m_input[m_index++];
return '\0';
}
template<typename C>
void JsonParser::consume_while(C condition)
{
while (condition(peek()))
consume();
}
void JsonParser::consume_whitespace()
{
consume_while([](char ch) { return is_whitespace(ch); });
}
bool JsonParser::consume_specific(char expected_ch)
{
char consumed_ch = consume();
return consumed_ch == expected_ch;
}
String JsonParser::consume_quoted_string()
{
if (!consume_specific('"'))
return {};
StringBuilder final_sb;
for (;;) {
size_t peek_index = m_index;
char ch = 0;
for (;;) {
if (peek_index == m_input.length())
break;
ch = m_input[peek_index];
if (ch == '"' || ch == '\\')
break;
++peek_index;
}
if (peek_index != m_index) {
while (peek_index != m_index) {
final_sb.append(m_input.characters_without_null_termination()[m_index]);
m_index++;
}
}
if (m_index == m_input.length())
break;
if (ch == '"')
break;
if (ch != '\\') {
final_sb.append(consume());
continue;
}
consume();
char escaped_ch = consume();
switch (escaped_ch) {
case 'n':
final_sb.append('\n');
break;
case 'r':
final_sb.append('\r');
break;
case 't':
final_sb.append('\t');
break;
case 'b':
final_sb.append('\b');
break;
case 'f':
final_sb.append('\f');
break;
case 'u': {
StringBuilder sb;
sb.append(consume());
sb.append(consume());
sb.append(consume());
sb.append(consume());
auto code_point = AK::StringUtils::convert_to_uint_from_hex(sb.to_string());
if (code_point.has_value()) {
final_sb.append_code_point(code_point.value());
} else {
final_sb.append('?');
}
} break;
default:
final_sb.append(escaped_ch);
break;
}
}
if (!consume_specific('"'))
return {};
return final_sb.to_string();
}
Optional<JsonValue> JsonParser::parse_object()
{
JsonObject object;
if (!consume_specific('{'))
return {};
for (;;) {
consume_whitespace();
if (peek() == '}')
break;
consume_whitespace();
auto name = consume_quoted_string();
if (name.is_null())
return {};
consume_whitespace();
if (!consume_specific(':'))
return {};
consume_whitespace();
auto value = parse_helper();
if (!value.has_value())
return {};
object.set(name, move(value.value()));
consume_whitespace();
if (peek() == '}')
break;
if (!consume_specific(','))
return {};
consume_whitespace();
if (peek() == '}')
return {};
}
if (!consume_specific('}'))
return {};
return object;
}
Optional<JsonValue> JsonParser::parse_array()
{
JsonArray array;
if (!consume_specific('['))
return {};
for (;;) {
consume_whitespace();
if (peek() == ']')
break;
auto element = parse_helper();
if (!element.has_value())
return {};
array.append(element.value());
consume_whitespace();
if (peek() == ']')
break;
if (!consume_specific(','))
return {};
consume_whitespace();
if (peek() == ']')
return {};
}
consume_whitespace();
if (!consume_specific(']'))
return {};
return array;
}
Optional<JsonValue> JsonParser::parse_string()
{
auto result = consume_quoted_string();
if (result.is_null())
return {};
return JsonValue(result);
}
Optional<JsonValue> JsonParser::parse_number()
{
JsonValue value;
Vector<char, 128> number_buffer;
Vector<char, 128> fraction_buffer;
bool is_double = false;
for (;;) {
char ch = peek();
if (ch == '.') {
is_double = true;
++m_index;
continue;
}
if (ch == '-' || (ch >= '0' && ch <= '9')) {
if (is_double)
fraction_buffer.append(ch);
else
number_buffer.append(ch);
++m_index;
continue;
}
break;
}
StringView number_string(number_buffer.data(), number_buffer.size());
StringView fraction_string(fraction_buffer.data(), fraction_buffer.size());
#ifndef KERNEL
if (is_double) {
// FIXME: This logic looks shaky.
int whole = 0;
auto to_signed_result = number_string.to_uint();
if (to_signed_result.has_value()) {
whole = to_signed_result.value();
} else {
auto number = number_string.to_int();
if (!number.has_value())
return {};
whole = number.value();
}
int fraction = fraction_string.to_uint().value();
fraction *= (whole < 0) ? -1 : 1;
auto divider = 1;
for (size_t i = 0; i < fraction_buffer.size(); ++i) {
divider *= 10;
}
value = JsonValue((double)whole + ((double)fraction / divider));
} else {
#endif
auto to_unsigned_result = number_string.to_uint();
if (to_unsigned_result.has_value()) {
value = JsonValue(to_unsigned_result.value());
} else {
auto number = number_string.to_int();
if (!number.has_value())
return {};
value = JsonValue(number.value());
}
#ifndef KERNEL
}
#endif
return value;
}
bool JsonParser::consume_string(const char* str)
{
for (size_t i = 0, length = strlen(str); i < length; ++i) {
if (!consume_specific(str[i]))
return false;
}
return true;
}
Optional<JsonValue> JsonParser::parse_true()
{
if (!consume_string("true"))
return {};
return JsonValue(true);
}
Optional<JsonValue> JsonParser::parse_false()
{
if (!consume_string("false"))
return {};
return JsonValue(false);
}
Optional<JsonValue> JsonParser::parse_null()
{
if (!consume_string("null"))
return {};
return JsonValue(JsonValue::Type::Null);
}
Optional<JsonValue> JsonParser::parse_helper()
{
consume_whitespace();
auto type_hint = peek();
switch (type_hint) {
case '{':
return parse_object();
case '[':
return parse_array();
case '"':
return parse_string();
case '-':
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
return parse_number();
case 'f':
return parse_false();
case 't':
return parse_true();
case 'n':
return parse_null();
}
return {};
}
Optional<JsonValue> JsonParser::parse() {
auto result = parse_helper();
if (!result.has_value())
return {};
consume_whitespace();
if (m_index != m_input.length())
return {};
return result;
}
}
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