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diff --git a/src/script/parser/qscriptsyntaxchecker_p.h b/src/script/parser/qscriptsyntaxchecker_p.h
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+/****************************************************************************
+**
+** 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 QtScript module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL-ONLY$
+** 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.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QSCRIPTSYNTAXCHECKER_H
+#define QSCRIPTSYNTAXCHECKER_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/qstring.h>
+
+#include "qscriptgrammar_p.h"
+
+QT_BEGIN_NAMESPACE
+
+namespace QScript {
+
+class Lexer;
+
+class SyntaxChecker: protected QScriptGrammar
+{
+public:
+    enum State {
+        Error,
+        Intermediate,
+        Valid,
+    };
+
+    struct Result {
+        Result(State s, int ln, int col, const QString &msg)
+            : state(s), errorLineNumber(ln), errorColumnNumber(col),
+              errorMessage(msg) {}
+        State state;
+        int errorLineNumber;
+        int errorColumnNumber;
+        QString errorMessage;
+    };
+
+    SyntaxChecker();
+    ~SyntaxChecker();
+
+    Result checkSyntax(const QString &code);
+
+protected:
+    bool automatic(QScript::Lexer *lexer, int token) const;
+    inline void reallocateStack();
+
+protected:
+    int tos;
+    int stack_size;
+    int *state_stack;
+};
+
+inline void SyntaxChecker::reallocateStack()
+{
+    if (! stack_size)
+        stack_size = 128;
+    else
+        stack_size <<= 1;
+
+    state_stack = reinterpret_cast<int*> (qRealloc(state_stack, stack_size * sizeof(int)));
+}
+
+} // namespace QScript
+
+QT_END_NAMESPACE
+
+#endif