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** This file is part of the QtDeclarative module of the Qt Toolkit.

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****************************************************************************/

#include "qdeclarativeexpression.h"

#include "private/qdeclarativeexpression_p.h"

#include "private/qdeclarativeengine_p.h"

#include "private/qdeclarativecontext_p.h"

#include "private/qdeclarativerewrite_p.h"

#include "private/qdeclarativecompiler_p.h"

#include "private/qdeclarativeglobalscriptclass_p.h"

#include <QtCore/qdebug.h>

#include <QtScript/qscriptprogram.h>

#include <private/qscriptdeclarativeclass_p.h>

QT_BEGIN_NAMESPACE

bool QDeclarativeDelayedError::addError(QDeclarativeEnginePrivate *e)

{

    if (!e) return false;

    if (e->inProgressCreations == 0) return false; // Not in construction

    if (prevError) return true; // Already in error chain

    prevError = &e->erroredBindings;

    nextError = e->erroredBindings;

    e->erroredBindings = this;

    if (nextError) nextError->prevError = &nextError;

    return true;

}

{

}

{

    if (guardList) { delete [] guardList; guardList = 0; }

    if (dataRef) dataRef->release();

}

QDeclarativeExpressionPrivate::QDeclarativeExpressionPrivate()

{

}

QDeclarativeExpressionPrivate::~QDeclarativeExpressionPrivate()

{

}

void QDeclarativeExpressionPrivate::init(QDeclarativeContextData *ctxt, const QString &expr, 

                                         QObject *me)

{

}

{

    quint32 *exprData = (quint32 *)expr;

    QDeclarativeCompiledData *dd = (QDeclarativeCompiledData *)rc;

    int progIdx = *(exprData);

    progIdx &= 0x7FFFFFFF;

    QDeclarativeEngine *engine = ctxt->engine;

    QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(engine);

    QScriptEngine *scriptEngine = QDeclarativeEnginePrivate::getScriptEngine(engine);

        if (!dd->cachedClosures.at(progIdx)) {

            QScriptContext *scriptContext = QScriptDeclarativeClass::pushCleanContext(scriptEngine);

            scriptContext->pushScope(ep->contextClass->newSharedContext());

            scriptEngine->popContext();

        }

    } else {

#if !defined(Q_OS_SYMBIAN) //XXX Why doesn't this work?

        if (!dd->cachedPrograms.at(progIdx)) {

        }

#else

#endif

    }

}

QScriptValue QDeclarativeExpressionPrivate::evalInObjectScope(QDeclarativeContextData *context, QObject *object, 

                                                              const QString &program, const QString &fileName,

                                                              int lineNumber, QScriptValue *contextObject)

{

    QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(context->engine);

    QScriptContext *scriptContext = QScriptDeclarativeClass::pushCleanContext(&ep->scriptEngine);

    if (contextObject) {

        *contextObject = ep->contextClass->newContext(context, object);

        scriptContext->pushScope(*contextObject);

    } else {

        scriptContext->pushScope(ep->contextClass->newContext(context, object));

    }

    QScriptValue rv = ep->scriptEngine.evaluate(program, fileName, lineNumber);

    ep->scriptEngine.popContext();

    return rv;

}

QScriptValue QDeclarativeExpressionPrivate::evalInObjectScope(QDeclarativeContextData *context, QObject *object, 

                                                              const QScriptProgram &program, 

                                                              QScriptValue *contextObject)

{

    QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(context->engine);

    QScriptContext *scriptContext = QScriptDeclarativeClass::pushCleanContext(&ep->scriptEngine);

    if (contextObject) {

        *contextObject = ep->contextClass->newContext(context, object);

        scriptContext->pushScope(*contextObject);

    } else {

        scriptContext->pushScope(ep->contextClass->newContext(context, object));

    }

    QScriptValue rv = ep->scriptEngine.evaluate(program);

    ep->scriptEngine.popContext();

    return rv;

}

/*!

    \class QDeclarativeExpression

    \brief The QDeclarativeExpression class evaluates JavaScript in a QML context.

*/

/*!

    Create an invalid QDeclarativeExpression.

    As the expression will not have an associated QDeclarativeContext, this will be a

    null expression object and its value will always be an invalid QVariant.

 */

QDeclarativeExpression::QDeclarativeExpression()

: QObject(*new QDeclarativeExpressionPrivate, 0)

{

}

/*!  \internal */

QDeclarativeExpression::QDeclarativeExpression(QDeclarativeContextData *ctxt, void *expr,

                                               QDeclarativeRefCount *rc, QObject *me, 

                                               const QString &url, int lineNumber,

                                               QDeclarativeExpressionPrivate &dd)

: QObject(dd, 0)

{

    Q_D(QDeclarativeExpression);

    d->init(ctxt, expr, rc, me, url, lineNumber);

}

/*!

    Create a QDeclarativeExpression object that is a child of \a parent.

    The \a expression JavaScript will be executed in the \a ctxt QDeclarativeContext.

    If specified, the \a scope object's properties will also be in scope during

    the expression's execution.

*/

QDeclarativeExpression::QDeclarativeExpression(QDeclarativeContext *ctxt,

                                               QObject *scope,

                                               const QString &expression,

                                               QObject *parent)

: QObject(*new QDeclarativeExpressionPrivate, parent)

{

    Q_D(QDeclarativeExpression);

    d->init(QDeclarativeContextData::get(ctxt), expression, scope);

}

/*! 

    \internal

*/

QDeclarativeExpression::QDeclarativeExpression(QDeclarativeContextData *ctxt, QObject *scope,

                                               const QString &expression)

: QObject(*new QDeclarativeExpressionPrivate, 0)

{

    Q_D(QDeclarativeExpression);

    d->init(ctxt, expression, scope);

}

/*!  \internal */

QDeclarativeExpression::QDeclarativeExpression(QDeclarativeContextData *ctxt, QObject *scope,

                                               const QString &expression, QDeclarativeExpressionPrivate &dd)

: QObject(dd, 0)

{

    Q_D(QDeclarativeExpression);

    d->init(ctxt, expression, scope);

}

/*!

    Destroy the QDeclarativeExpression instance.

*/

QDeclarativeExpression::~QDeclarativeExpression()

{

}

/*!

    Returns the QDeclarativeEngine this expression is associated with, or 0 if there

    is no association or the QDeclarativeEngine has been destroyed.

*/

QDeclarativeEngine *QDeclarativeExpression::engine() const

{

    Q_D(const QDeclarativeExpression);

}

/*!

    Returns the QDeclarativeContext this expression is associated with, or 0 if there

    is no association or the QDeclarativeContext has been destroyed.

*/

QDeclarativeContext *QDeclarativeExpression::context() const

{

    Q_D(const QDeclarativeExpression);

    return data?data->asQDeclarativeContext():0;

}

/*!

    Returns the expression string.

*/

QString QDeclarativeExpression::expression() const

{

    Q_D(const QDeclarativeExpression);

}

/*!

    Set the expression to \a expression.

*/

void QDeclarativeExpression::setExpression(const QString &expression)

{

    Q_D(QDeclarativeExpression);

}

void QDeclarativeExpressionPrivate::exceptionToError(QScriptEngine *scriptEngine, 

                                            QDeclarativeError &error)

{

    if (scriptEngine->hasUncaughtException() && 

        scriptEngine->uncaughtException().isError()) {

        QString fileName;

        int lineNumber = scriptEngine->uncaughtExceptionLineNumber();

        QScriptValue exception = scriptEngine->uncaughtException();

        QLatin1String fileNameProp("fileName");

        if (!exception.property(fileNameProp).toString().isEmpty()){

            fileName = exception.property(fileNameProp).toString();

        } else {

            fileName = QLatin1String("<Unknown File>");

        }

        error.setUrl(QUrl(fileName));

        error.setLine(lineNumber);

        error.setColumn(-1);

        error.setDescription(exception.toString());

    } else {

        error = QDeclarativeError();

    }

}

{

    QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(engine);

    QScriptEngine *scriptEngine = QDeclarativeEnginePrivate::getScriptEngine(engine);

    QDeclarativeContextData *oldSharedContext = 0;

    QObject *oldSharedScope = 0;

    QObject *oldOverride = 0;

        oldSharedContext = ep->sharedContext;

        oldSharedScope = ep->sharedScope;

    } else {

    }

        ep->sharedContext = oldSharedContext;

        ep->sharedScope = oldSharedScope;

    }

    if (isUndefined)

        *isUndefined = svalue.isUndefined() || scriptEngine->hasUncaughtException();

    // Handle exception

    if (scriptEngine->hasUncaughtException()) {

       scriptEngine->clearExceptions();

       return QScriptValue();

    } else {

        return svalue;

    }

}