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gta5view/qjson4/QJsonParser.cpp

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/*****************************************************************************
* gta5sync GRAND THEFT AUTO V SYNC
* Copyright (C) 2016 Syping
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*****************************************************************************/
#include "QJsonParser.h"
#include "QJsonArray.h"
#include "QJsonObject.h"
#include "QJsonValue.h"
#if QT_VERSION < 0x050000
#include <cctype>
#include <QScopedPointer>
#include <QVector>
namespace {
unsigned int to_hex(int ch) {
static const int hexval[256] = {
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0
};
if(static_cast<unsigned int>(ch) < 256) {
return hexval[static_cast<unsigned int>(ch)];
} else {
return 0;
}
}
}
//------------------------------------------------------------------------------
// Name: QJsonParser
//------------------------------------------------------------------------------
QJsonParser::QJsonParser(const char *begin, const char *end) : begin_(begin), end_(end), p_(begin) {
state_.error = QJsonParseError::NoError;
state_.offset = 0;
}
//------------------------------------------------------------------------------
// Name: parse
//------------------------------------------------------------------------------
QJsonRoot *QJsonParser::parse() {
if(begin_ == end_) {
return 0;
}
QJsonRoot *ret = 0;
try {
const char ch = peek();
switch(ch) {
case ArrayBegin:
ret = getArray();
break;
case ObjectBegin:
ret = getObject();
break;
default:
state_.error = QJsonParseError::IllegalValue;
state_.offset = p_ - begin_;
break;
}
} catch(const QJsonParseError &e) {
state_ = e;
}
if(ret) {
// eat up trailing white space...
while(p_ != end_ && std::isspace(*p_)) {
++p_;
}
//detect trailing garbage
if(p_ != end_) {
state_.error = QJsonParseError::GarbageAtEnd;
state_.offset = p_ - begin_;
}
}
return ret;
}
//------------------------------------------------------------------------------
// Name: peek
//------------------------------------------------------------------------------
char QJsonParser::peek() {
// first eat up some whitespace
while(p_ != end_ && std::isspace(*p_)) {
++p_;
}
return *p_;
}
//------------------------------------------------------------------------------
// Name: getValue
//------------------------------------------------------------------------------
QJsonValue QJsonParser::getValue() {
switch(peek()) {
case ObjectBegin:
{
QScopedPointer<QJsonObject> obj(getObject());
return QJsonValue(*obj);
}
case ArrayBegin:
{
QScopedPointer<QJsonArray> arr(getArray());
return QJsonValue(*arr);
}
case Quote:
return QJsonValue(getString());
case 't':
return getTrue();
case 'f':
return getFalse();
case 'n':
return getNull();
default:
return getNumber();
}
throwError(QJsonParseError::MissingObject);
return QJsonValue();
}
//------------------------------------------------------------------------------
// Name: getObject
//------------------------------------------------------------------------------
QJsonObject *QJsonParser::getObject() {
QScopedPointer<QJsonObject> obj(new QJsonObject);
char tok = peek();
if(tok != ObjectBegin) {
throwError(QJsonParseError::IllegalValue);
}
++p_;
// handle empty object
tok = peek();
if(peek() == ObjectEnd) {
++p_;
} else {
do {
QPair<QString, QJsonValue> p = getPair();
obj->values_.insert(p.first, p.second);
tok = peek();
++p_;
} while(tok == ValueSeparator);
}
if(tok != ObjectEnd) {
throwError(QJsonParseError::UnterminatedObject);
}
return obj.take();
}
//------------------------------------------------------------------------------
// Name: getArray
//------------------------------------------------------------------------------
QJsonArray *QJsonParser::getArray() {
QScopedPointer<QJsonArray> arr(new QJsonArray);
char tok = peek();
if(tok != ArrayBegin) {
throwError(QJsonParseError::IllegalValue);
}
++p_;
// handle empty object
tok = peek();
if(tok == ArrayEnd) {
++p_;
} else {
do {
arr->values_.push_back(getValue());
tok = peek();
++p_;
} while(tok == ValueSeparator);
}
if(tok != ArrayEnd) {
throwError(QJsonParseError::MissingValueSeparator);
}
return arr.take();
}
//------------------------------------------------------------------------------
// Name: getPair
//------------------------------------------------------------------------------
QPair<QString, QJsonValue> QJsonParser::getPair() {
QString key = getString();
if(peek() != NameSeparator) {
throwError(QJsonParseError::MissingNameSeparator);
}
++p_;
return qMakePair(key, getValue());
}
//------------------------------------------------------------------------------
// Name: getString
//------------------------------------------------------------------------------
QString QJsonParser::getString() {
if(peek() != Quote) {
throwError(QJsonParseError::IllegalUTF8String);
}
++p_;
QByteArray s;
while(p_ != end_ && *p_ != Quote && *p_ != '\n') {
if(*p_ == '\\') {
++p_;
if(p_ != end_) {
switch(*p_) {
case '"': s.append('"'); break;
case '\\': s.append('\\'); break;
case '/': s.append('/'); break;
case 'b': s.append('\b'); break;
case 'f': s.append('\f'); break;
case 'n': s.append('\n'); break;
case 'r': s.append('\r'); break;
case 't': s.append('\t'); break;
case 'u':
{
QString hexChar;
// convert \uXXXX escape sequences to UTF-8
char hex[4];
if(p_ == end_) { throwError(QJsonParseError::IllegalEscapeSequence); } hex[0] = *++p_;
if(p_ == end_) { throwError(QJsonParseError::IllegalEscapeSequence); } hex[1] = *++p_;
if(p_ == end_) { throwError(QJsonParseError::IllegalEscapeSequence); } hex[2] = *++p_;
if(p_ == end_) { throwError(QJsonParseError::IllegalEscapeSequence); } hex[3] = *++p_;
if(!std::isxdigit(hex[0])) throwError(QJsonParseError::IllegalUTF8String);
if(!std::isxdigit(hex[1])) throwError(QJsonParseError::IllegalUTF8String);
if(!std::isxdigit(hex[2])) throwError(QJsonParseError::IllegalUTF8String);
if(!std::isxdigit(hex[3])) throwError(QJsonParseError::IllegalUTF8String);
quint16 w1 = 0;
quint16 w2 = 0;
w1 |= (to_hex(hex[0]) << 12);
w1 |= (to_hex(hex[1]) << 8);
w1 |= (to_hex(hex[2]) << 4);
w1 |= (to_hex(hex[3]));
hexChar.append(QChar(w1));
if((w1 & 0xfc00) == 0xdc00) {
throwError(QJsonParseError::IllegalUTF8String);
}
if((w1 & 0xfc00) == 0xd800) {
// part of a surrogate pair
if(p_ == end_ || *++p_ != '\\') { throwError(QJsonParseError::IllegalEscapeSequence); }
if(p_ == end_ || *++p_ != 'u') { throwError(QJsonParseError::IllegalEscapeSequence); }
// convert \uXXXX escape sequences to UTF-8
if(p_ == end_) { throwError(QJsonParseError::IllegalEscapeSequence); } hex[0] = *++p_;
if(p_ == end_) { throwError(QJsonParseError::IllegalEscapeSequence); } hex[1] = *++p_;
if(p_ == end_) { throwError(QJsonParseError::IllegalEscapeSequence); } hex[2] = *++p_;
if(p_ == end_) { throwError(QJsonParseError::IllegalEscapeSequence); } hex[3] = *++p_;
if(!std::isxdigit(hex[0])) throwError(QJsonParseError::IllegalUTF8String);
if(!std::isxdigit(hex[1])) throwError(QJsonParseError::IllegalUTF8String);
if(!std::isxdigit(hex[2])) throwError(QJsonParseError::IllegalUTF8String);
if(!std::isxdigit(hex[3])) throwError(QJsonParseError::IllegalUTF8String);
w2 |= (to_hex(hex[0]) << 12);
w2 |= (to_hex(hex[1]) << 8);
w2 |= (to_hex(hex[2]) << 4);
w2 |= (to_hex(hex[3]));
hexChar.append(QChar(w2));
}
s.append(hexChar.toUtf8());
}
break;
default:
s.append('\\');
break;
}
}
} else {
s.append(*p_);
}
++p_;
}
if(*p_ != Quote || p_ == end_) {
throwError(QJsonParseError::UnterminatedString);
}
++p_;
return QString::fromUtf8(s, s.size());
}
//------------------------------------------------------------------------------
// Name: getNull
//------------------------------------------------------------------------------
QJsonValue QJsonParser::getNull() {
if(p_ == end_ || *p_++ != 'n') { throwError(QJsonParseError::IllegalValue); }
if(p_ == end_ || *p_++ != 'u') { throwError(QJsonParseError::IllegalValue); }
if(p_ == end_ || *p_++ != 'l') { throwError(QJsonParseError::IllegalValue); }
if(p_ == end_ || *p_++ != 'l') { throwError(QJsonParseError::IllegalValue); }
return QJsonValue();
}
//------------------------------------------------------------------------------
// Name: getTrue
//------------------------------------------------------------------------------
QJsonValue QJsonParser::getTrue() {
if(p_ == end_ || *p_++ != 't') { throwError(QJsonParseError::IllegalValue); }
if(p_ == end_ || *p_++ != 'r') { throwError(QJsonParseError::IllegalValue); }
if(p_ == end_ || *p_++ != 'u') { throwError(QJsonParseError::IllegalValue); }
if(p_ == end_ || *p_++ != 'e') { throwError(QJsonParseError::IllegalValue); }
return QJsonValue(true);
}
//------------------------------------------------------------------------------
// Name: getFalse
//------------------------------------------------------------------------------
QJsonValue QJsonParser::getFalse() {
if(p_ == end_ || *p_++ != 'f') { throwError(QJsonParseError::IllegalValue); }
if(p_ == end_ || *p_++ != 'a') { throwError(QJsonParseError::IllegalValue); }
if(p_ == end_ || *p_++ != 'l') { throwError(QJsonParseError::IllegalValue); }
if(p_ == end_ || *p_++ != 's') { throwError(QJsonParseError::IllegalValue); }
if(p_ == end_ || *p_++ != 'e') { throwError(QJsonParseError::IllegalValue); }
return QJsonValue(false);
}
//------------------------------------------------------------------------------
// Name: getNumber
//------------------------------------------------------------------------------
QJsonValue QJsonParser::getNumber() {
// JSON numbers fit the regex: -?(0|[1-9][0-9]*)(\.[0-9]+)?([eE][+-]?[0-9]+)?
const char *const first = p_;
// -?
if(p_ != end_ && *p_ == '-') {
++p_;
}
// (0|[1-9][0-9]*)
if(p_ != end_) {
if(*p_ >= '1' && *p_ <= '9') {
while(p_ != end_ && std::isdigit(*p_)) {
++p_;
}
} else if(*p_ == '0') {
++p_;
} else {
throwError(QJsonParseError::IllegalNumber);
}
}
// (\.[0-9]+)?
if(p_ != end_ && *p_ == '.') {
++p_;
if(!std::isdigit(*p_)) {
throwError(QJsonParseError::IllegalNumber);
}
while(p_ != end_ && std::isdigit(*p_)) {
++p_;
}
}
// ([eE][+-]?[0-9]+)?
if(p_ != end_ && (*p_ == 'e' || *p_ == 'E')) {
++p_;
if(p_ != end_ && (*p_ == '+' || *p_ == '-')) {
++p_;
}
if(!std::isdigit(*p_)) {
throwError(QJsonParseError::IllegalNumber);
}
while(p_ != end_ && std::isdigit(*p_)) {
++p_;
}
}
if(p_ == end_) {
throwError(QJsonParseError::TerminationByNumber);
}
return QJsonValue(QByteArray::fromRawData(first, p_ - first).toDouble());
}
//------------------------------------------------------------------------------
// Name: state
//------------------------------------------------------------------------------
QJsonParseError QJsonParser::state() const {
return state_;
}
//------------------------------------------------------------------------------
// Name: throwError
//------------------------------------------------------------------------------
void QJsonParser::throwError(QJsonParseError::ParseError e) {
QJsonParseError err;
err.error = e;
err.offset = p_ - begin_;
throw err;
}
#endif
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