Say hello to QScriptProgram :-)

QScriptProgram encapsulates a Qt Script program (AKA a script).
It retains the compiled representation of the script, so that
repeated evaluation of the same script becomes faster.

An overload of QScriptEngine::evaluate() that takes a QScriptProgram
has been added.

Reviewed-by: Olivier Goffart

1 files changed, 225 insertions, 0 deletions

diff --git a/src/script/api/qscriptprogram.cpp b/src/script/api/qscriptprogram.cpp
new file mode 100644
index 0000000..c30f381
--- /dev/null
+++ b/src/script/api/qscriptprogram.cpp
@@ -0,0 +1,225 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** 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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "config.h"
+#include "qscriptprogram.h"
+#include "qscriptprogram_p.h"
+#include "qscriptengine.h"
+#include "qscriptengine_p.h"
+
+#include "Executable.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+  \internal
+
+  \since 4.6
+  \class QScriptProgram
+
+  \brief The QScriptProgram class encapsulates a Qt Script program.
+
+  \ingroup script
+
+  QScriptProgram retains the compiled representation of the script if
+  possible. Thus, QScriptProgram can be used to evaluate the same
+  script multiple times more efficiently.
+
+  \code
+  QScriptEngine engine;
+  QScriptProgram program("1 + 2");
+  QScriptValue result = engine.evaluate(program);
+  \endcode
+*/
+
+QScriptProgramPrivate::QScriptProgramPrivate(const QString &src,
+                                             const QString &fn,
+                                             int ln)
+    : sourceCode(src), fileName(fn), firstLineNumber(ln),
+      engine(0), _executable(0), sourceId(-1), isCompiled(false)
+{
+    ref = 0;
+}
+
+QScriptProgramPrivate::~QScriptProgramPrivate()
+{
+    delete _executable;
+}
+
+QScriptProgramPrivate *QScriptProgramPrivate::get(const QScriptProgram &q)
+{
+    return const_cast<QScriptProgramPrivate*>(q.d_func());
+}
+
+JSC::EvalExecutable *QScriptProgramPrivate::executable(JSC::ExecState *exec,
+                                                       QScriptEnginePrivate *eng)
+{
+    if (_executable) {
+        if (eng == engine)
+            return _executable;
+        delete _executable;
+    }
+    WTF::PassRefPtr<QScript::UStringSourceProviderWithFeedback> provider
+        = QScript::UStringSourceProviderWithFeedback::create(sourceCode, fileName, firstLineNumber, eng);
+    sourceId = provider->asID();
+    JSC::SourceCode source(provider, firstLineNumber); //after construction of SourceCode provider variable will be null.
+    _executable = new JSC::EvalExecutable(exec, source);
+    engine = eng;
+    isCompiled = false;
+    return _executable;
+}
+
+/*!
+  Constructs a null QScriptProgram.
+*/
+QScriptProgram::QScriptProgram()
+    : d_ptr(0)
+{
+}
+
+/*!
+  Constructs a new QScriptProgram with the given \a sourceCode, \a
+  fileName and \a firstLineNumber.
+*/
+QScriptProgram::QScriptProgram(const QString &sourceCode,
+                               const QString fileName,
+                               int firstLineNumber)
+    : d_ptr(new QScriptProgramPrivate(sourceCode, fileName, firstLineNumber))
+{
+}
+
+/*!
+  Constructs a new QScriptProgram that is a copy of \a other.
+*/
+QScriptProgram::QScriptProgram(const QScriptProgram &other)
+    : d_ptr(other.d_ptr)
+{
+}
+
+/*!
+  Destroys this QScriptProgram.
+*/
+QScriptProgram::~QScriptProgram()
+{
+    Q_D(QScriptProgram);
+    //    if (d->engine && (d->ref == 1))
+    //      d->engine->unregisterScriptProgram(d);
+}
+
+/*!
+  Assigns the \a other value to this QScriptProgram.
+*/
+QScriptProgram &QScriptProgram::operator=(const QScriptProgram &other)
+{
+  //    if (d_func() && d_func()->engine && (d_func()->ref == 1))
+      //        d_func()->engine->unregisterScriptProgram(d_func());
+  //    }
+    d_ptr = other.d_ptr;
+    return *this;
+}
+
+/*!
+  Returns true if this QScriptProgram is null; otherwise
+  returns false.
+*/
+bool QScriptProgram::isNull() const
+{
+    Q_D(const QScriptProgram);
+    return (d == 0);
+}
+
+/*!
+  Returns the source code of this program.
+*/
+QString QScriptProgram::sourceCode() const
+{
+    Q_D(const QScriptProgram);
+    if (!d)
+        return QString();
+    return d->sourceCode;
+}
+
+/*!
+  Returns the filename associated with this program.
+*/
+QString QScriptProgram::fileName() const
+{
+    Q_D(const QScriptProgram);
+    if (!d)
+        return QString();
+    return d->fileName;
+}
+
+/*!
+  Returns the line number associated with this program.
+*/
+int QScriptProgram::firstLineNumber() const
+{
+    Q_D(const QScriptProgram);
+    if (!d)
+        return -1;
+    return d->firstLineNumber;
+}
+
+/*!
+  Returns true if this QScriptProgram is equal to \a other;
+  otherwise returns false.
+*/
+bool QScriptProgram::operator==(const QScriptProgram &other) const
+{
+    Q_D(const QScriptProgram);
+    if (d == other.d_func())
+        return true;
+    return (sourceCode() == other.sourceCode())
+        && (fileName() == other.fileName())
+        && (firstLineNumber() == other.firstLineNumber());
+}
+
+/*!
+  Returns true if this QScriptProgram is not equal to \a other;
+  otherwise returns false.
+*/
+bool QScriptProgram::operator!=(const QScriptProgram &other) const
+{
+    return !operator==(other);
+}
+
+QT_END_NAMESPACE