1 files changed, 273 insertions, 0 deletions
diff --git a/src/declarative/qml/qdeclarativerewrite.cpp b/src/declarative/qml/qdeclarativerewrite.cpp
new file mode 100644
index 0000000000..6311e01d43
--- /dev/null
+++ b/src/declarative/qml/qdeclarativerewrite.cpp
@@ -0,0 +1,273 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative 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 "private/qdeclarativerewrite_p.h"
+
+#include "private/qdeclarativeglobal_p.h"
+
+#include <QtCore/qdebug.h>
+
+QT_BEGIN_NAMESPACE
+
+DEFINE_BOOL_CONFIG_OPTION(rewriteDump, QML_REWRITE_DUMP);
+
+namespace QDeclarativeRewrite {
+
+bool SharedBindingTester::isSharable(const QString &code)
+{
+    Engine engine;
+    NodePool pool(QString(), &engine);
+    Lexer lexer(&engine);
+    Parser parser(&engine);
+    lexer.setCode(code, 0);
+    parser.parseStatement();
+    if (!parser.statement()) 
+        return false;
+
+    return isSharable(parser.statement());
+}
+
+bool SharedBindingTester::isSharable(AST::Node *node)
+{
+    _sharable = true;
+    AST::Node::acceptChild(node, this);
+    return _sharable;
+}
+
+QString RewriteBinding::operator()(const QString &code, bool *ok, bool *sharable)
+{
+    Engine engine;
+    NodePool pool(QString(), &engine);
+    Lexer lexer(&engine);
+    Parser parser(&engine);
+    lexer.setCode(code, 0);
+    parser.parseStatement();
+    if (!parser.statement()) {
+        if (ok) *ok = false;
+        return QString();
+    } else {
+        if (ok) *ok = true;
+        if (sharable) {
+            SharedBindingTester tester;
+            *sharable = tester.isSharable(parser.statement());
+        }
+    }
+    return rewrite(code, 0, parser.statement());
+}
+
+QString RewriteBinding::operator()(QDeclarativeJS::AST::Node *node, const QString &code, bool *sharable)
+{
+    if (!node)
+        return code;
+
+    if (sharable) {
+        SharedBindingTester tester;
+        *sharable = tester.isSharable(node);
+    }
+
+    QDeclarativeJS::AST::ExpressionNode *expression = node->expressionCast();
+    QDeclarativeJS::AST::Statement *statement = node->statementCast();
+    if(!expression && !statement)
+        return code;
+
+    TextWriter w;
+    _writer = &w;
+    _position = expression ? expression->firstSourceLocation().begin() : statement->firstSourceLocation().begin();
+    _inLoop = 0;
+
+    accept(node);
+
+    unsigned startOfStatement = 0;
+    unsigned endOfStatement = (expression ? expression->lastSourceLocation().end() : statement->lastSourceLocation().end()) - _position;
+
+    QString startString = QLatin1String("(function ") + QString::fromUtf8(_name) + QLatin1String("() { ");
+    if (expression)
+        startString += QLatin1String("return ");
+    _writer->replace(startOfStatement, 0, startString);
+    _writer->replace(endOfStatement, 0, QLatin1String(" })"));
+
+    if (rewriteDump()) {
+        qWarning() << "=============================================================";
+        qWarning() << "Rewrote:";
+        qWarning() << qPrintable(code);
+    }
+
+    QString codeCopy = code;
+    w.write(&codeCopy);
+
+    if (rewriteDump()) {
+        qWarning() << "To:";
+        qWarning() << qPrintable(code);
+        qWarning() << "=============================================================";
+    }
+
+    return codeCopy;
+}
+
+void RewriteBinding::accept(AST::Node *node)
+{
+    AST::Node::acceptChild(node, this);
+}
+
+QString RewriteBinding::rewrite(QString code, unsigned position,
+                                AST::Statement *node)
+{
+    TextWriter w;
+    _writer = &w;
+    _position = position;
+    _inLoop = 0;
+
+    accept(node);
+
+    unsigned startOfStatement = node->firstSourceLocation().begin() - _position;
+    unsigned endOfStatement = node->lastSourceLocation().end() - _position;
+
+    _writer->replace(startOfStatement, 0, QLatin1String("(function ") + QString::fromUtf8(_name) + QLatin1String("() { "));
+    _writer->replace(endOfStatement, 0, QLatin1String(" })"));
+
+    if (rewriteDump()) {
+        qWarning() << "=============================================================";
+        qWarning() << "Rewrote:";
+        qWarning() << qPrintable(code);
+    }
+
+    w.write(&code);
+
+    if (rewriteDump()) {
+        qWarning() << "To:";
+        qWarning() << qPrintable(code);
+        qWarning() << "=============================================================";
+    }
+
+    return code;
+}
+
+bool RewriteBinding::visit(AST::Block *ast)
+{
+    for (AST::StatementList *it = ast->statements; it; it = it->next) {
+        if (! it->next) {
+            // we need to rewrite only the last statement of a block.
+            accept(it->statement);
+        }
+    }
+
+    return false;
+}
+
+bool RewriteBinding::visit(AST::ExpressionStatement *ast)
+{
+    if (! _inLoop) {
+        unsigned startOfExpressionStatement = ast->firstSourceLocation().begin() - _position;
+        _writer->replace(startOfExpressionStatement, 0, QLatin1String("return "));
+    }
+
+    return false;
+}
+
+bool RewriteBinding::visit(AST::DoWhileStatement *)
+{
+    ++_inLoop;
+    return true;
+}
+
+void RewriteBinding::endVisit(AST::DoWhileStatement *)
+{
+    --_inLoop;
+}
+
+bool RewriteBinding::visit(AST::WhileStatement *)
+{
+    ++_inLoop;
+    return true;
+}
+
+void RewriteBinding::endVisit(AST::WhileStatement *)
+{
+    --_inLoop;
+}
+
+bool RewriteBinding::visit(AST::ForStatement *)
+{
+    ++_inLoop;
+    return true;
+}
+
+void RewriteBinding::endVisit(AST::ForStatement *)
+{
+    --_inLoop;
+}
+
+bool RewriteBinding::visit(AST::LocalForStatement *)
+{
+    ++_inLoop;
+    return true;
+}
+
+void RewriteBinding::endVisit(AST::LocalForStatement *)
+{
+    --_inLoop;
+}
+
+bool RewriteBinding::visit(AST::ForEachStatement *)
+{
+    ++_inLoop;
+    return true;
+}
+
+void RewriteBinding::endVisit(AST::ForEachStatement *)
+{
+    --_inLoop;
+}
+
+bool RewriteBinding::visit(AST::LocalForEachStatement *)
+{
+    ++_inLoop;
+    return true;
+}
+
+void RewriteBinding::endVisit(AST::LocalForEachStatement *)
+{
+    --_inLoop;
+}
+
+} // namespace QDeclarativeRewrite
+
+QT_END_NAMESPACE