diff options
author | Lars Knoll <lars.knoll@nokia.com> | 2012-01-18 10:12:50 +0100 |
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committer | Qt by Nokia <qt-info@nokia.com> | 2012-01-24 15:28:20 +0100 |
commit | 37a7b035f8feb248d25741b22e22ffb0ec7463d6 (patch) | |
tree | 8f323ed9ef5554d8debae92ba0a95f05d6162d3b /src/corelib/json/qjsonvalue.cpp | |
parent | 4b8ceb41aed352f10d36db5284453f425dbc5f3f (diff) |
Import json support from playground/qtbinaryjson
This imports the JSON support for Qt 5 from
playground/qtbinaryjson.
It adds a fast, fully compliant json parser, a
convenient C++ API, conversion to and from
QVariants and a binary format for JSON that is
extremely fast to use together with the C++ API.
Change-Id: If9e3a21a4241d388d0abaa446b6824f9cc6edb1c
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Diffstat (limited to 'src/corelib/json/qjsonvalue.cpp')
-rw-r--r-- | src/corelib/json/qjsonvalue.cpp | 569 |
1 files changed, 569 insertions, 0 deletions
diff --git a/src/corelib/json/qjsonvalue.cpp b/src/corelib/json/qjsonvalue.cpp new file mode 100644 index 0000000000..bd93cbfeb1 --- /dev/null +++ b/src/corelib/json/qjsonvalue.cpp @@ -0,0 +1,569 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtCore module 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 <qjsonobject.h> +#include <qjsonvalue.h> +#include <qjsonarray.h> +#include <qjsonarray.h> +#include <qvariant.h> +#include <qstringlist.h> +#include <qdebug.h> + +#include "qjson_p.h" + +QT_BEGIN_NAMESPACE + +/*! + \class QJsonValue + \ingroup json + \reentrant + \since 5.0 + + \brief The QJsonValue class encapsulates a value in JSON. + + A value in JSON can be one of 6 basic types: + + JSON is a format to store structured data. It has 6 basic data types: + + \list + \o bool QJsonValue::Bool + \o double QJsonValue::Double + \o string QJsonValue::String + \o array QJsonValue::Array + \o object QJsonValue::Object + \o null QJsonValue::Null + \endlist + + A value can represent any of the above data types. In addition, QJsonValue has one special + flag to represent undefined values. This can be queried with isUndefined(). + + The type of the value can be queried with type() or accessors like isBool(), isString(), and so on. + Likewise, the value can be converted to the type stored in it using the toBool(), toString() and so on. + + Values are strictly typed internally and contrary to QVariant will not attempt to do any implicit type + conversions. This implies that converting to a type that is not stored in the value will return a default + constructed return value. +*/ + +/*! + Creates a QJsonValue of type \a type. + + The default is to create a Null value. + */ +QJsonValue::QJsonValue(Type type) + : ui(0), d(0), t(type) +{ +} + +/*! + \internal + */ +QJsonValue::QJsonValue(QJsonPrivate::Data *data, QJsonPrivate::Base *base, const QJsonPrivate::Value &v) + : d(0) +{ + t = (Type)(uint)v.type; + switch (t) { + case Undefined: + case Null: + dbl = 0; + break; + case Bool: + b = v.toBoolean(); + break; + case Double: + dbl = v.toDouble(base); + break; + case String: { + QString s = v.toString(base); + stringData = s.data_ptr(); + stringData->ref.ref(); + break; + } + case Array: + case Object: + d = data; + this->base = v.base(base); + break; + } + if (d) + d->ref.ref(); +} + +/*! + Creates a value of type Bool, with value \a b. + */ +QJsonValue::QJsonValue(bool b) + : d(0), t(Bool) +{ + this->b = b; +} + +/*! + Creates a value of type Double, with value \a n. + */ +QJsonValue::QJsonValue(double n) + : d(0), t(Double) +{ + this->dbl = n; +} + +/*! + \overload + Creates a value of type Double, with value \a n. + */ +QJsonValue::QJsonValue(int n) + : d(0), t(Double) +{ + this->dbl = n; +} + +/*! + Creates a value of type String, with value \a s. + */ +QJsonValue::QJsonValue(const QString &s) + : d(0), t(String) +{ + stringData = *(QStringData **)(&s); + stringData->ref.ref(); +} + +/*! + Creates a value of type String, with value \a s. + */ +QJsonValue::QJsonValue(const QLatin1String &s) + : d(0), t(String) +{ + // ### FIXME: Avoid creating the temp QString below + QString str(s); + stringData = *(QStringData **)(&str); + stringData->ref.ref(); +} + +/*! + Creates a value of type Array, with value \a a. + */ +QJsonValue::QJsonValue(const QJsonArray &a) + : d(a.d), t(Array) +{ + base = a.a; + if (d) + d->ref.ref(); +} + +/*! + Creates a value of type Object, with value \a o. + */ +QJsonValue::QJsonValue(const QJsonObject &o) + : d(o.d), t(Object) +{ + base = o.o; + if (d) + d->ref.ref(); +} + + +/*! + Destroys the value. + */ +QJsonValue::~QJsonValue() +{ + if (t == String && stringData && !stringData->ref.deref()) + free(stringData); + + if (d && !d->ref.deref()) + delete d; +} + +/*! + Creates a copy of \a other. + */ +QJsonValue::QJsonValue(const QJsonValue &other) +{ + t = other.t; + d = other.d; + ui = other.ui; + if (d) + d->ref.ref(); + + if (t == String && stringData) + stringData->ref.ref(); +} + +/*! + Assigns the value stored in \a other to this object. + */ +QJsonValue &QJsonValue::operator =(const QJsonValue &other) +{ + if (t == String && stringData && !stringData->ref.deref()) + free(stringData); + + t = other.t; + dbl = other.dbl; + + if (d != other.d) { + + if (d && !d->ref.deref()) + delete d; + d = other.d; + if (d) + d->ref.ref(); + + } + + if (t == String && stringData) + stringData->ref.ref(); + + return *this; +} + +/*! + Converts \a variant to a QJsonValue and returns it. + + The conversion will convert QVariant types as follows: + + \list + \o QVariant::Bool to Bool + \o QVariant::Int + \o QVariant::Double + \o QVariant::LongLong + \o QVariant::ULongLong + \o QVariant::UInt to Double + \o QVariant::String to String + \o QVariant::StringList + \o QVariant::VariantList to Array + \o QVariant::VariantMap to Object + \endlist + + For all other QVariant types a conversion to a QString will be attempted. If the returned string + is empty, a Null QJsonValue will be stored, otherwise a String value using the returned QString. + + \sa toVariant() + */ +QJsonValue QJsonValue::fromVariant(const QVariant &variant) +{ + switch (variant.type()) { + case QVariant::Bool: + return QJsonValue(variant.toBool()); + case QVariant::Int: + case QVariant::Double: + case QVariant::LongLong: + case QVariant::ULongLong: + case QVariant::UInt: + return QJsonValue(variant.toDouble()); + case QVariant::String: + return QJsonValue(variant.toString()); + case QVariant::StringList: + return QJsonValue(QJsonArray::fromStringList(variant.toStringList())); + case QVariant::List: + return QJsonValue(QJsonArray::fromVariantList(variant.toList())); + case QVariant::Map: + return QJsonValue(QJsonObject::fromVariantMap(variant.toMap())); + default: + break; + } + QString string = variant.toString(); + if (string.isEmpty()) + return QJsonValue(); + return QJsonValue(string); +} + +/*! + Converts the value to a QVariant. + + The QJsonValue types will be converted as follows: + + \value Null QVariant() + \value Bool QVariant::Bool + \value Double QVariant::Double + \value String QVariant::String + \value Array QVariantList + \value Object QVariantMap + \value Undefined QVariant() + + \sa fromVariant() + */ +QVariant QJsonValue::toVariant() const +{ + switch (t) { + case Bool: + return b; + case Double: + return dbl; + case String: + return toString(); + case Array: + return QJsonArray(d, static_cast<QJsonPrivate::Array *>(base)).toVariantList(); + case Object: + return QJsonObject(d, static_cast<QJsonPrivate::Object *>(base)).toVariantMap(); + case Null: + case Undefined: + break; + } + return QVariant(); +} + +/*! + \enum QJsonValue::Type + + This enum describes the type of the JSON value. + + \value Null A Null value + \value Bool A boolean value. Use toBool() to convert to a bool. + \value Double A double. Use toDouble() to convert to a double. + \value String A string. Use toString() to convert to a QString. + \value Array An array. Use toArray() to convert to a QJsonArray. + \value Object An object. Use toObject() to convert to a QJsonObject. + \value Undefined The value is undefined. This is usually returned as an + error condition, when trying to read an out of bounds value + in an array or a non existant key in an object. +*/ + +/*! + Returns the type of the value. + + \sa QJsonValue::Type + */ +QJsonValue::Type QJsonValue::type() const +{ + return t; +} + +/*! + Converts the value to a bool and returns it. + + If type() is not bool, false will be returned. + */ +bool QJsonValue::toBool() const +{ + if (t != Bool) + return false; + return b; +} + +/*! + Converts the value to a double and returns it. + + If type() is not Double, 0. will be returned. + */ +double QJsonValue::toDouble() const +{ + if (t != Double) + return 0; + return dbl; +} + +/*! + Converts the value to a QString and returns it. + + If type() is not String, a QString() will be returned. + */ +QString QJsonValue::toString() const +{ + if (t != String) + return QString(); + stringData->ref.ref(); // the constructor below doesn't add a ref. + return QString(*(const QConstStringData<1> *)stringData); +} + +/*! + Converts the value to an array and returns it. + + If type() is not Array, a QJsonArray() will be returned. + */ +QJsonArray QJsonValue::toArray() const +{ + if (!d || t != Array) + return QJsonArray(); + + return QJsonArray(d, static_cast<QJsonPrivate::Array *>(base)); +} + +/*! + Converts the value to an object and returns it. + + If type() is not Object, a QJsonObject() will be returned. + */ +QJsonObject QJsonValue::toObject() const +{ + if (!d || t != Object) + return QJsonObject(); + + return QJsonObject(d, static_cast<QJsonPrivate::Object *>(base)); +} + +/*! + Returns true if the value is equal to \a other. + */ +bool QJsonValue::operator==(const QJsonValue &other) const +{ + if (t != other.t) + return false; + + switch (t) { + case Undefined: + case Null: + break; + case Bool: + return b == other.b; + case Double: + return dbl == other.dbl; + case String: + return toString() == other.toString(); + case Array: + return QJsonArray(d, static_cast<QJsonPrivate::Array *>(base)) + == QJsonArray(other.d, static_cast<QJsonPrivate::Array *>(other.base)); + case Object: + return QJsonObject(d, static_cast<QJsonPrivate::Object *>(base)) + == QJsonObject(other.d, static_cast<QJsonPrivate::Object *>(other.base)); + } + return true; +} + +/*! + Returns true if the value is not equal to \a other. + */ +bool QJsonValue::operator!=(const QJsonValue &other) const +{ + return !(*this == other); +} + +/*! + \internal + */ +void QJsonValue::detach() +{ + if (!d) + return; + + QJsonPrivate::Data *x = d->clone(base); + x->ref.ref(); + if (!d->ref.deref()) + delete d; + d = x; + base = static_cast<QJsonPrivate::Object *>(d->header->root()); +} + + +/*! + \class QJsonValueRef + \reentrant + \brief The QJsonValueRef class is a helper class for QJsonValue. + + \internal + + \ingroup json + + When you get an object of type QJsonValueRef, if you can assign to it, + the assignment will apply to the character in the string from + which you got the reference. That is its whole purpose in life. + + You can use it exactly in the same way as a reference to a QJsonValue. + + The QJsonValueRef becomes invalid once modifications are made to the + string: if you want to keep the character, copy it into a QJsonValue. + + Most of the QJsonValue member functions also exist in QJsonValueRef. + However, they are not explicitly documented here. +*/ + + +QJsonValueRef &QJsonValueRef::operator =(const QJsonValue &val) +{ + if (is_object) + o->setValueAt(index, val); + else + a->replace(index, val); + + return *this; +} + +QJsonArray QJsonValueRef::toArray() const +{ + return toValue().toArray(); +} + +QJsonObject QJsonValueRef::toObject() const +{ + return toValue().toObject(); +} + +QJsonValue QJsonValueRef::toValue() const +{ + if (!is_object) + return a->at(index); + return o->valueAt(index); +} + +#ifndef QT_NO_DEBUG_STREAM +QDebug operator<<(QDebug dbg, const QJsonValue &o) +{ + switch (o.t) { + case QJsonValue::Undefined: + dbg.nospace() << "QJsonValue(undefined)"; + break; + case QJsonValue::Null: + dbg.nospace() << "QJsonValue(null)"; + break; + case QJsonValue::Bool: + dbg.nospace() << "QJsonValue(bool, " << o.toBool() << ")"; + break; + case QJsonValue::Double: + dbg.nospace() << "QJsonValue(double, " << o.toDouble() << ")"; + break; + case QJsonValue::String: + dbg.nospace() << "QJsonValue(string, " << o.toString() << ")"; + break; + case QJsonValue::Array: + dbg.nospace() << "QJsonValue(array, "; + dbg.nospace() << o.toArray(); + dbg.nospace() << ")"; + break; + case QJsonValue::Object: + dbg.nospace() << "QJsonValue(object, "; + dbg.nospace() << o.toObject(); + dbg.nospace() << ")"; + break; + } + return dbg.space(); +} +#endif + +QT_END_NAMESPACE |