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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the tools applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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, Nokia gives you certain additional
** rights. These rights are described in the Nokia 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.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "json.h"
#ifdef TODO_USE_CREATOR
#include <utils/qtcassert.h>
#endif // TODO_USE_CREATOR
#include <QtCore/QByteArray>
#include <QtCore/QTextStream>
#include <QtCore/QDebug>
#include <QtCore/QStringList>
#include <QtCore/QVariant>
#include <ctype.h>
//#define DEBUG_JASON
#ifdef DEBUG_JASON
#define JDEBUG(s) qDebug() << s
#else
#define JDEBUG(s)
#endif
namespace Coda {
static void skipSpaces(const char *&from, const char *to)
{
while (from != to && isspace(*from))
++from;
}
QTextStream &operator<<(QTextStream &os, const JsonValue &mi)
{
return os << mi.toString();
}
void JsonValue::parsePair(const char *&from, const char *to)
{
skipSpaces(from, to);
JDEBUG("parsePair: " << QByteArray(from, to - from));
m_name = parseCString(from, to);
skipSpaces(from, to);
while (from < to && *from != ':') {
JDEBUG("not a colon" << *from);
++from;
}
++from;
parseValue(from, to);
skipSpaces(from, to);
}
QByteArray JsonValue::parseNumber(const char *&from, const char *to)
{
QByteArray result;
if (from < to && *from == '-') // Leading '-'.
result.append(*from++);
while (from < to && *from >= '0' && *from <= '9')
result.append(*from++);
return result;
}
QByteArray JsonValue::parseCString(const char *&from, const char *to)
{
QByteArray result;
const char * const fromSaved = from;
JDEBUG("parseCString: " << QByteArray(from, to - from));
if (*from != '"') {
qDebug() << "JSON Parse Error, double quote expected";
++from; // So we don't hang
return QByteArray();
}
const char *ptr = from;
++ptr;
while (ptr < to) {
if (*ptr == '"') {
++ptr;
result = QByteArray(from + 1, ptr - from - 2);
break;
}
if (*ptr == '\\') {
++ptr;
if (ptr == to) {
qWarning("JSON Parse Error, unterminated backslash escape in '%s'",
QByteArray(fromSaved, to - fromSaved).constData());
from = ptr; // So we don't hang
return QByteArray();
}
}
++ptr;
}
from = ptr;
int idx = result.indexOf('\\');
if (idx >= 0) {
char *dst = result.data() + idx;
const char *src = dst + 1, *end = result.data() + result.length();
do {
char c = *src++;
switch (c) {
case 'a': *dst++ = '\a'; break;
case 'b': *dst++ = '\b'; break;
case 'f': *dst++ = '\f'; break;
case 'n': *dst++ = '\n'; break;
case 'r': *dst++ = '\r'; break;
case 't': *dst++ = '\t'; break;
case 'v': *dst++ = '\v'; break;
case '"': *dst++ = '"'; break;
case '\\': *dst++ = '\\'; break;
case 'u': { // 4 digit hex escape as in '\u000a'
if (end - src < 4) {
qWarning("JSON Parse Error, too few hex digits in \\u-escape in '%s' obtained from '%s'",
result.constData(), QByteArray(fromSaved, to - fromSaved).constData());
return QByteArray();
}
bool ok;
const uchar prod = QByteArray(src, 4).toUInt(&ok, 16);
if (!ok) {
qWarning("JSON Parse Error, invalid hex digits in \\u-escape in '%s' obtained from '%s'",
result.constData(), QByteArray(fromSaved, to - fromSaved).constData());
return QByteArray();
}
*dst++ = prod;
src += 4;
}
break;
default: { // Up to 3 decimal digits: Not sure if this is supported in JSON?
int chars = 0;
uchar prod = 0;
forever {
if (c < '0' || c > '7') {
--src;
break;
}
prod = prod * 8 + c - '0';
if (++chars == 3 || src == end)
break;
c = *src++;
}
if (!chars) {
qWarning("JSON Parse Error, unrecognized backslash escape in string '%s' obtained from '%s'",
result.constData(), QByteArray(fromSaved, to - fromSaved).constData());
return QByteArray();
}
*dst++ = prod;
}
}
while (src != end) {
char c = *src++;
if (c == '\\')
break;
*dst++ = c;
}
} while (src != end);
*dst = 0;
result.truncate(dst - result.data());
}
JDEBUG("parseCString, got " << result);
return result;
}
void JsonValue::parseValue(const char *&from, const char *to)
{
JDEBUG("parseValue: " << QByteArray(from, to - from));
switch (*from) {
case '{':
parseObject(from, to);
break;
case 't':
if (to - from >= 4 && qstrncmp(from, "true", 4) == 0) {
m_data = QByteArray(from, 4);
from += m_data.size();
m_type = Boolean;
}
break;
case 'f':
if (to - from >= 5 && qstrncmp(from, "false", 5) == 0) {
m_data = QByteArray(from, 5);
from += m_data.size();
m_type = Boolean;
}
break;
case 'n':
if (to - from >= 4 && qstrncmp(from, "null", 4) == 0) {
m_data = QByteArray(from, 4);
from += m_data.size();
m_type = NullObject;
}
break;
case '[':
parseArray(from, to);
break;
case '"':
m_type = String;
m_data = parseCString(from, to);
break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
case '-':
m_type = Number;
m_data = parseNumber(from, to);
default:
break;
}
}
void JsonValue::parseObject(const char *&from, const char *to)
{
JDEBUG("parseObject: " << QByteArray(from, to - from));
#ifdef TODO_USE_CREATOR
QTC_ASSERT(*from == '{', /**/);
#endif
++from;
m_type = Object;
while (from < to) {
if (*from == '}') {
++from;
break;
}
JsonValue child;
child.parsePair(from, to);
if (!child.isValid())
return;
m_children += child;
if (*from == ',')
++from;
}
}
void JsonValue::parseArray(const char *&from, const char *to)
{
JDEBUG("parseArray: " << QByteArray(from, to - from));
#ifdef TODO_USE_CREATOR
QTC_ASSERT(*from == '[', /**/);
#endif
++from;
m_type = Array;
while (from < to) {
if (*from == ']') {
++from;
break;
}
JsonValue child;
child.parseValue(from, to);
if (child.isValid())
m_children += child;
if (*from == ',')
++from;
}
}
void JsonValue::setStreamOutput(const QByteArray &name, const QByteArray &content)
{
if (content.isEmpty())
return;
JsonValue child;
child.m_type = String;
child.m_name = name;
child.m_data = content;
m_children += child;
if (m_type == Invalid)
m_type = Object;
}
static QByteArray ind(int indent)
{
return QByteArray(2 * indent, ' ');
}
void JsonValue::dumpChildren(QByteArray * str, bool multiline, int indent) const
{
for (int i = 0; i < m_children.size(); ++i) {
if (i != 0) {
*str += ',';
if (multiline)
*str += '\n';
}
if (multiline)
*str += ind(indent);
*str += m_children.at(i).toString(multiline, indent);
}
}
class MyString : public QString {
public:
ushort at(int i) const { return constData()[i].unicode(); }
};
template<class ST, typename CT>
inline ST escapeCStringTpl(const ST &ba)
{
ST ret;
ret.reserve(ba.length() * 2);
for (int i = 0; i < ba.length(); ++i) {
CT c = ba.at(i);
switch (c) {
case '\\': ret += "\\\\"; break;
case '\a': ret += "\\a"; break;
case '\b': ret += "\\b"; break;
case '\f': ret += "\\f"; break;
case '\n': ret += "\\n"; break;
case '\r': ret += "\\r"; break;
case '\t': ret += "\\t"; break;
case '\v': ret += "\\v"; break;
case '"': ret += "\\\""; break;
default:
if (c < 32 || c == 127) {
ret += '\\';
ret += '0' + (c >> 6);
ret += '0' + ((c >> 3) & 7);
ret += '0' + (c & 7);
} else {
ret += c;
}
}
}
return ret;
}
QString JsonValue::escapeCString(const QString &ba)
{
return escapeCStringTpl<MyString, ushort>(static_cast<const MyString &>(ba));
}
QByteArray JsonValue::escapeCString(const QByteArray &ba)
{
return escapeCStringTpl<QByteArray, uchar>(ba);
}
QByteArray JsonValue::toString(bool multiline, int indent) const
{
QByteArray result;
switch (m_type) {
case Invalid:
if (multiline)
result += ind(indent) + "Invalid\n";
else
result += "Invalid";
break;
case String:
if (!m_name.isEmpty())
result += m_name + '=';
result += '"' + escapeCString(m_data) + '"';
break;
case Number:
if (!m_name.isEmpty())
result += '"' + m_name + "\":";
result += m_data;
break;
case Boolean:
case NullObject:
if (!m_name.isEmpty())
result += '"' + m_name + "\":";
result += m_data;
break;
case Object:
if (!m_name.isEmpty())
result += m_name + '=';
if (multiline) {
result += "{\n";
dumpChildren(&result, multiline, indent + 1);
result += '\n' + ind(indent) + '}';
} else {
result += '{';
dumpChildren(&result, multiline, indent + 1);
result += '}';
}
break;
case Array:
if (!m_name.isEmpty())
result += m_name + '=';
if (multiline) {
result += "[\n";
dumpChildren(&result, multiline, indent + 1);
result += '\n' + ind(indent) + ']';
} else {
result += '[';
dumpChildren(&result, multiline, indent + 1);
result += ']';
}
break;
}
return result;
}
QVariant JsonValue::toVariant() const
{
switch (m_type) {
case String:
return QString(m_data);
case Number: {
bool ok;
qint64 val = QString(m_data).toLongLong(&ok);
if (ok)
return val;
return QVariant();
}
case Object: {
QHash<QString, QVariant> hash;
for (int i = 0; i < m_children.size(); ++i) {
QString name(m_children[i].name());
QVariant val = m_children[i].toVariant();
hash.insert(name, val);
}
return hash;
}
case Array: {
QList<QVariant> list;
for (int i = 0; i < m_children.size(); ++i) {
list.append(m_children[i].toVariant());
}
return list;
}
case Boolean:
return data() == QByteArray("true");
case Invalid:
case NullObject:
default:
return QVariant();
}
}
void JsonValue::fromString(const QByteArray &ba)
{
const char *from = ba.constBegin();
const char *to = ba.constEnd();
parseValue(from, to);
}
JsonValue JsonValue::findChild(const char *name) const
{
for (int i = 0; i < m_children.size(); ++i)
if (m_children.at(i).m_name == name)
return m_children.at(i);
return JsonValue();
}
void JsonInputStream::appendCString(const char *s)
{
m_target.append('"');
for (const char *p = s; *p; p++) {
if (*p == '"' || *p == '\\')
m_target.append('\\');
m_target.append(*p);
}
m_target.append('"');
}
void JsonInputStream::appendString(const QString &in)
{
if (in.isEmpty()) {
m_target.append("\"\"");
return;
}
const QChar doubleQuote('"');
const QChar backSlash('\\');
QString rc;
const int inSize = in.size();
rc.reserve(in.size() + 5);
rc.append(doubleQuote);
for (int i = 0; i < inSize; i++) {
const QChar c = in.at(i);
if (c == doubleQuote || c == backSlash)
rc.append(backSlash);
rc.append(c);
}
rc.append(doubleQuote);
m_target.append(rc.toUtf8());
return;
}
JsonInputStream &JsonInputStream::operator<<(const QStringList &in)
{
m_target.append('[');
const int count = in.size();
for (int i = 0 ; i < count; i++) {
if (i)
m_target.append(',');
appendString(in.at(i));
}
m_target.append(']');
return *this;
}
JsonInputStream &JsonInputStream::operator<<(const QVector<QByteArray> &ba)
{
m_target.append('[');
const int count = ba.size();
for (int i = 0 ; i < count; i++) {
if (i)
m_target.append(',');
appendCString(ba.at(i).constData());
}
m_target.append(']');
return *this;
}
JsonInputStream &JsonInputStream::operator<<(bool b)
{
m_target.append(b ? "true" : "false");
return *this;
}
} // namespace Coda
|