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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtLocation module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
** This file is part of the Nokia services plugin for the Maps and
** Navigation API. The use of these services, whether by use of the
** plugin or by other means, is governed by the terms and conditions
** described by the file NOKIA_TERMS_AND_CONDITIONS.txt in
** this package, located in the directory containing the Nokia services
** plugin source code.
**
****************************************************************************/
#ifndef JSONPARSER_H
#define JSONPARSER_H
#include <QVariant>
#include <QString>
#include <QRegExp>
QT_BEGIN_NAMESPACE
class JSONParser
{
public:
QString data;
int pos;
JSONParser(QString data) : data(data), pos(0) {}
bool detectString(const QString & string) {
skipWhitespace();
return data.mid(pos, string.size()) == string;
}
void skipWhitespace() {
while (pos < data.size() && data[pos].isSpace())
++pos;
}
char peek() const {
if (pos < data.size())
return data[pos].toLatin1();
else
return -1;
}
QChar peekQ() const {
if (pos < data.size())
return data[pos];
else
return QChar(short(-1));
}
bool next() {
if (pos < data.size()-1) {
++pos;
return true;
}
return false;
}
QVariant parse() {
QVariant ret;
skipWhitespace();
switch (peek()) {
case '{':
ret = parseHash();
break;
case '[':
ret = parseList();
break;
case '"':
ret = parseString();
break;
case 't':
case 'f':
ret = parseBoolean();
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
case '.':
ret = parseNumber();
break;
case -1:
// we went off the end of the string
// return an invalid QVariant
break;
default:
ret = parseUnknown();
break;
}
return ret;
}
QVariantHash parseHash() {
bool hascomma = true;
QVariantHash ret;
Q_ASSERT(peek() == '{');
next();
do {
skipWhitespace();
QString key = parseString();
skipWhitespace();
Q_ASSERT(peek() == ':');
next();
QVariant value = parse();
ret[key] = value;
skipWhitespace();
if (peek() == ',') {
next();
}
else {
hascomma = false;
}
} while (hascomma);
skipWhitespace();
//Q_ASSERT(peek() == '}');
next();
return ret;
}
QVariantList parseList() {
bool hascomma = true;
QVariantList ret;
Q_ASSERT(peek() == '[');
next();
do {
skipWhitespace();
QVariant value = parse();
ret << value;
skipWhitespace();
if (peek() == ',') {
next();
}
else {
hascomma = false;
}
} while (hascomma);
skipWhitespace();
//Q_ASSERT(peek() == ']');
next();
return ret;
}
QString parseString() {
QString ret;
Q_ASSERT(peek() == '"');
while (true) {
if (!next()) return ret;
char c = peek();
switch (c) {
case '"':
next();
return ret;
case '\\':
next();
// fall-through
default:
ret += peekQ();
}
}
}
QVariant parseBoolean() {
bool retbool = detectString("true");
pos += retbool ? 4 : 5;
return retbool;
}
QVariant parseNumber() {
QRegExp r("[^-0-9.e+]");
int newPos = r.indexIn(data, pos, QRegExp::CaretAtOffset);
QVariant ret(data.mid(pos, newPos-pos).toDouble());
pos = newPos;
return ret;
}
QVariant parseUnknown() {
QVariant ret(QString("unknown(")+peekQ()+"|"+QString::number((int)peekQ().unicode())+")");
next();
return ret;
}
};
QT_END_NAMESPACE
#endif // JSONPARSER_H
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