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Diffstat (limited to 'src/script/qscriptcontext.cpp')
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diff --git a/src/script/qscriptcontext.cpp b/src/script/qscriptcontext.cpp deleted file mode 100644 index aed69d3..0000000 --- a/src/script/qscriptcontext.cpp +++ /dev/null @@ -1,571 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). -** Contact: Nokia Corporation (qt-info@nokia.com) -** -** This file is part of the QtScript module of the Qt Toolkit. -** -** $QT_BEGIN_LICENSE:LGPL$ -** No Commercial Usage -** This file contains pre-release code and may not be distributed. -** You may use this file in accordance with the terms and conditions -** contained in the either Technology Preview License Agreement or the -** Beta Release License Agreement. -** -** 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, Nokia gives you certain -** additional rights. These rights are described in the Nokia Qt LGPL -** Exception version 1.0, 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. -** -** If you are unsure which license is appropriate for your use, please -** contact the sales department at http://qt.nokia.com/contact. -** $QT_END_LICENSE$ -** -****************************************************************************/ - -#include "qscriptcontext.h" - -#ifndef QT_NO_SCRIPT - -#include "qscriptcontextinfo.h" -#include "qscriptengine_p.h" -#include "qscriptvalueimpl_p.h" -#include "qscriptcontext_p.h" -#include "qscriptmember_p.h" -#include "qscriptobject_p.h" - -QT_BEGIN_NAMESPACE - -/*! - \since 4.3 - \class QScriptContext - - \brief The QScriptContext class represents a Qt Script function invocation. - - \ingroup script - - - A QScriptContext provides access to the `this' object and arguments - passed to a script function. You typically want to access this - information when you're writing a native (C++) function (see - QScriptEngine::newFunction()) that will be called from script - code. For example, when the script code - - \snippet doc/src/snippets/code/src_script_qscriptcontext.cpp 0 - - is evaluated, a QScriptContext will be created, and the context will - carry the arguments as QScriptValues; in this particular case, the - arguments will be one QScriptValue containing the number 20.5, a second - QScriptValue containing the string \c{"hello"}, and a third QScriptValue - containing a Qt Script object. - - Use argumentCount() to get the number of arguments passed to the - function, and argument() to get an argument at a certain index. The - argumentsObject() function returns a Qt Script array object - containing all the arguments; you can use the QScriptValueIterator - to iterate over its elements, or pass the array on as arguments to - another script function using QScriptValue::call(). - - Use thisObject() to get the `this' object associated with the function call, - and setThisObject() to set the `this' object. If you are implementing a - native "instance method", you typically fetch the thisObject() and access - one or more of its properties: - - \snippet doc/src/snippets/code/src_script_qscriptcontext.cpp 1 - - Use isCalledAsConstructor() to determine if the function was called - as a constructor (e.g. \c{"new foo()"} (as constructor) or just - \c{"foo()"}). When a function is called as a constructor, the - thisObject() contains the newly constructed object that the function - is expected to initialize. - - Use throwValue() or throwError() to throw an exception. - - Use callee() to obtain the QScriptValue that represents the function being - called. This can for example be used to call the function recursively. - - Use parentContext() to get a pointer to the context that precedes - this context in the activation stack. This is mostly useful for - debugging purposes (e.g. when constructing some form of backtrace). - - The activationObject() function returns the object that is used to - hold the local variables associated with this function call. You can - replace the activation object by calling setActivationObject(). A - typical usage of these functions is when you want script code to be - evaluated in the context of the parent context, e.g. to implement an - include() function: - - \snippet doc/src/snippets/code/src_script_qscriptcontext.cpp 2 - - Use backtrace() to get a human-readable backtrace associated with - this context. This can be useful for debugging purposes when - implementing native functions. The toString() function provides a - string representation of the context. (QScriptContextInfo provides - more detailed debugging-related information about the - QScriptContext.) - - Use engine() to obtain a pointer to the QScriptEngine that this context - resides in. - - \sa QScriptContextInfo, QScriptEngine::newFunction(), QScriptable -*/ - -/*! - \enum QScriptContext::ExecutionState - - This enum specifies the execution state of the context. - - \value NormalState The context is in a normal state. - - \value ExceptionState The context is in an exceptional state. -*/ - -/*! - \enum QScriptContext::Error - - This enum specifies types of error. - - \value ReferenceError A reference error. - - \value SyntaxError A syntax error. - - \value TypeError A type error. - - \value RangeError A range error. - - \value URIError A URI error. - - \value UnknownError An unknown error. -*/ - -/*! - Throws an exception with the given \a value. - Returns the value thrown (the same as the argument). - - \sa throwError(), state() -*/ -QScriptValue QScriptContext::throwValue(const QScriptValue &value) -{ - Q_D(QScriptContext); - d->m_result = d->engine()->toImpl(value); - d->m_state = QScriptContext::ExceptionState; -#ifndef Q_SCRIPT_NO_EVENT_NOTIFY - d->engine()->notifyException(d); -#endif - return value; -} - -/*! - Throws an \a error with the given \a text. - Returns the created error object. - - The \a text will be stored in the \c{message} property of the error - object. - - The error object will be initialized to contain information about - the location where the error occurred; specifically, it will have - properties \c{lineNumber}, \c{fileName} and \c{stack}. These - properties are described in \l {QtScript Extensions to ECMAScript}. - - \sa throwValue(), state() -*/ -QScriptValue QScriptContext::throwError(Error error, const QString &text) -{ - Q_D(QScriptContext); - return d->engine()->toPublic(d->throwError(error, text)); -} - -/*! - \overload - - Throws an error with the given \a text. - Returns the created error object. - - \sa throwValue(), state() -*/ -QScriptValue QScriptContext::throwError(const QString &text) -{ - Q_D(QScriptContext); - return d->engine()->toPublic(d->throwError(text)); -} - -/*! - \internal -*/ -QScriptContext::QScriptContext(): - d_ptr(new QScriptContextPrivate()) -{ - d_ptr->q_ptr = this; -} - -/*! - Destroys this QScriptContext. -*/ -QScriptContext::~QScriptContext() -{ - delete d_ptr; - d_ptr = 0; -} - -/*! - Returns the QScriptEngine that this QScriptContext belongs to. -*/ -QScriptEngine *QScriptContext::engine() const -{ - Q_D(const QScriptContext); - return QScriptEnginePrivate::get(d->engine()); -} - -/*! - Returns the function argument at the given \a index. - - If \a index >= argumentCount(), a QScriptValue of - the primitive type Undefined is returned. - - \sa argumentCount() -*/ -QScriptValue QScriptContext::argument(int index) const -{ - Q_D(const QScriptContext); - if (index < 0) - return QScriptValue(); - return d->engine()->toPublic(d->argument(index)); -} - -/*! - Returns the callee. The callee is the function object that this - QScriptContext represents an invocation of. -*/ -QScriptValue QScriptContext::callee() const -{ - Q_D(const QScriptContext); - return d->engine()->toPublic(d->m_callee); -} - -/*! - Returns the arguments object of this QScriptContext. - - The arguments object has properties \c callee (equal to callee()) - and \c length (equal to argumentCount()), and properties \c 0, \c 1, - ..., argumentCount() - 1 that provide access to the argument - values. Initially, property \c P (0 <= \c P < argumentCount()) has - the same value as argument(\c P). In the case when \c P is less - than the number of formal parameters of the function, \c P shares - its value with the corresponding property of the activation object - (activationObject()). This means that changing this property changes - the corresponding property of the activation object and vice versa. - - \sa argument(), activationObject() -*/ -QScriptValue QScriptContext::argumentsObject() const -{ - Q_D(const QScriptContext); - return d->engine()->toPublic(d->argumentsObject()); -} - -/*! - Returns true if the function was called as a constructor - (e.g. \c{"new foo()"}); otherwise returns false. - - When a function is called as constructor, the thisObject() - contains the newly constructed object to be initialized. -*/ -bool QScriptContext::isCalledAsConstructor() const -{ - Q_D(const QScriptContext); - return d->m_calledAsConstructor; -} - -/*! - Returns the parent context of this QScriptContext. -*/ -QScriptContext *QScriptContext::parentContext() const -{ - Q_D(const QScriptContext); - return QScriptContextPrivate::get(d->previous); -} - -/*! - Returns the number of arguments passed to the function - in this invocation. - - Note that the argument count can be different from the - formal number of arguments (the \c{length} property of - callee()). - - \sa argument() -*/ -int QScriptContext::argumentCount() const -{ - Q_D(const QScriptContext); - return d->argc; -} - -/*! - \internal -*/ -QScriptValue QScriptContext::returnValue() const -{ - Q_D(const QScriptContext); - return d->engine()->toPublic(d->m_result); -} - -/*! - \internal -*/ -void QScriptContext::setReturnValue(const QScriptValue &result) -{ - Q_D(QScriptContext); - d->m_result = d->engine()->toImpl(result); -} - -/*! - Returns the activation object of this QScriptContext. The activation - object provides access to the local variables associated with this - context. - - \sa argument(), argumentsObject() -*/ -QScriptValue QScriptContext::activationObject() const -{ - Q_D(const QScriptContext); - return d->engine()->toPublic(d->activationObject()); -} - -/*! - Sets the activation object of this QScriptContext to be the given \a - activation. - - If \a activation is not an object, this function does nothing. -*/ -void QScriptContext::setActivationObject(const QScriptValue &activation) -{ - Q_D(QScriptContext); - if (!activation.isObject()) { - return; - } else if (activation.engine() != engine()) { - qWarning("QScriptContext::setActivationObject() failed: " - "cannot set an object created in " - "a different engine"); - } else { - d->m_activation = d->engine()->toImpl(activation); - } -} - -/*! - Returns the `this' object associated with this QScriptContext. -*/ -QScriptValue QScriptContext::thisObject() const -{ - Q_D(const QScriptContext); - return d->engine()->toPublic(d->m_thisObject); -} - -/*! - Sets the `this' object associated with this QScriptContext to be - \a thisObject. - - If \a thisObject is not an object, this function does nothing. -*/ -void QScriptContext::setThisObject(const QScriptValue &thisObject) -{ - Q_D(QScriptContext); - if (!thisObject.isObject()) { - } else if (thisObject.engine() != engine()) { - qWarning("QScriptContext::setThisObject() failed: " - "cannot set an object created in " - "a different engine"); - } else { - d->m_thisObject = d->engine()->toImpl(thisObject); - } -} - -/*! - Returns the execution state of this QScriptContext. -*/ -QScriptContext::ExecutionState QScriptContext::state() const -{ - Q_D(const QScriptContext); - return d->m_state; -} - -/*! - Returns a human-readable backtrace of this QScriptContext. - - Each line is of the form \c{<function-name>(<arguments>)@<file-name>:<line-number>}. - - To access individual pieces of debugging-related information (for - example, to construct your own backtrace representation), use - QScriptContextInfo. - - \sa QScriptEngine::uncaughtExceptionBacktrace(), QScriptContextInfo, toString() -*/ -QStringList QScriptContext::backtrace() const -{ - Q_D(const QScriptContext); - return d->backtrace(); -} - -static QString safeValueToString(const QScriptValue &value) -{ - if (value.isObject()) - return QLatin1String("[object Object]"); - else - return value.toString(); -} - -/*! - \since 4.4 - - Returns a string representation of this context. - This is useful for debugging. - - \sa backtrace() -*/ -QString QScriptContext::toString() const -{ - QScriptContextInfo info(this); - QString result; - - QString functionName = info.functionName(); - if (functionName.isEmpty()) { - if (parentContext()) { - if (info.functionType() == QScriptContextInfo::ScriptFunction) - result.append(QLatin1String("<anonymous>")); - else - result.append(QLatin1String("<native>")); - } else { - result.append(QLatin1String("<global>")); - } - } else { - result.append(functionName); - } - - QStringList parameterNames = info.functionParameterNames(); - result.append(QLatin1String(" (")); - for (int i = 0; i < argumentCount(); ++i) { - if (i > 0) - result.append(QLatin1String(", ")); - if (i < parameterNames.count()) { - result.append(parameterNames.at(i)); - result.append(QLatin1Char('=')); - } - QScriptValue arg = argument(i); - result.append(safeValueToString(arg)); - } - result.append(QLatin1Char(')')); - - QString fileName = info.fileName(); - int lineNumber = info.lineNumber(); - result.append(QLatin1String(" at ")); - if (!fileName.isEmpty()) { - result.append(fileName); - result.append(QLatin1Char(':')); - } - result.append(QString::number(lineNumber)); - return result; -} - -/*! - \internal - \since 4.5 - - Returns the scope chain of this QScriptContext. -*/ -QScriptValueList QScriptContext::scopeChain() const -{ - Q_D(const QScriptContext); - // make sure arguments properties are initialized - const QScriptContextPrivate *ctx = d; - while (ctx) { - (void)ctx->activationObject(); - ctx = ctx->previous; - } - QScriptValueList result; - QScriptEnginePrivate *eng_p = QScriptEnginePrivate::get(engine()); - QScriptValueImpl scope = d->m_scopeChain; - while (scope.isObject()) { - if (scope.classInfo() == eng_p->m_class_with) - result.append(eng_p->toPublic(scope.prototype())); - else - result.append(eng_p->toPublic(scope)); - scope = scope.scope(); - } - return result; -} - -/*! - \internal - \since 4.5 - - Adds the given \a object to the front of this context's scope chain. - - If \a object is not an object, this function does nothing. -*/ -void QScriptContext::pushScope(const QScriptValue &object) -{ - Q_D(QScriptContext); - if (!object.isObject()) { - return; - } else if (object.engine() != engine()) { - qWarning("QScriptContext::pushScope() failed: " - "cannot push an object created in " - "a different engine"); - return; - } - QScriptEnginePrivate *eng_p = QScriptEnginePrivate::get(engine()); - if (!d->m_scopeChain.isValid()) { - d->m_scopeChain = eng_p->toImpl(object); - } else { - QScriptValueImpl withObject; - eng_p->newObject(&withObject, eng_p->toImpl(object), eng_p->m_class_with); - withObject.m_object_value->m_scope = d->m_scopeChain; - withObject.setInternalValue(1); // to differentiate from with-statement objects - d->m_scopeChain = withObject; - } -} - -/*! - \internal - \since 4.5 - - Removes the front object from this context's scope chain, and - returns the removed object. - - If the scope chain is already empty, this function returns an - invalid QScriptValue. -*/ -QScriptValue QScriptContext::popScope() -{ - Q_D(QScriptContext); - if (!d->m_scopeChain.isObject()) - return QScriptValue(); - QScriptValueImpl result; - QScriptEnginePrivate *eng_p = QScriptEnginePrivate::get(engine()); - if (d->m_scopeChain.classInfo() != eng_p->m_class_with) - result = d->m_scopeChain; - else - result = d->m_scopeChain.prototype(); - d->m_scopeChain = d->m_scopeChain.m_object_value->m_scope; - return eng_p->toPublic(result); -} - -QT_END_NAMESPACE - -#endif // QT_NO_SCRIPT |