1 files changed, 119 insertions, 0 deletions
diff --git a/src/qml/qml/v4/qv4syntaxchecker.cpp b/src/qml/qml/v4/qv4syntaxchecker.cpp
new file mode 100644
index 0000000000..fcda486af2
--- /dev/null
+++ b/src/qml/qml/v4/qv4syntaxchecker.cpp
@@ -0,0 +1,119 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the V4VM module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** 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, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, 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.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qv4syntaxchecker_p.h"
+
+using namespace QQmlJS;
+
+SyntaxChecker::SyntaxChecker()
+    : Lexer(&m_engine)
+    , m_stateStack(128)
+{
+}
+
+void QQmlJS::SyntaxChecker::clearText()
+{
+    m_code.clear();
+    m_tokens.clear();
+}
+
+void SyntaxChecker::appendText(const QString &text)
+{
+    m_code += text;
+}
+
+QString SyntaxChecker::text() const
+{
+    return m_code;
+}
+
+bool SyntaxChecker::canEvaluate()
+{
+    int yyaction = 0;
+    int yytoken = -1;
+    int yytos = -1;
+
+    setCode(m_code, 1);
+
+    m_tokens.clear();
+    m_tokens.append(T_FEED_JS_PROGRAM);
+
+    do {
+        if (++yytos == m_stateStack.size())
+            m_stateStack.resize(m_stateStack.size() * 2);
+
+        m_stateStack[yytos] = yyaction;
+
+again:
+        if (yytoken == -1 && action_index[yyaction] != -TERMINAL_COUNT) {
+            if (m_tokens.isEmpty())
+                yytoken = lex();
+            else
+                yytoken = m_tokens.takeFirst();
+        }
+
+        yyaction = t_action(yyaction, yytoken);
+        if (yyaction > 0) {
+            if (yyaction == ACCEPT_STATE) {
+                --yytos;
+                return true;
+            }
+            yytoken = -1;
+        } else if (yyaction < 0) {
+            const int ruleno = -yyaction - 1;
+            yytos -= rhs[ruleno];
+            yyaction = nt_action(m_stateStack[yytos], lhs[ruleno] - TERMINAL_COUNT);
+        }
+    } while (yyaction);
+
+    const int errorState = m_stateStack[yytos];
+    if (t_action(errorState, T_AUTOMATIC_SEMICOLON) && canInsertAutomaticSemicolon(yytoken)) {
+        yyaction = errorState;
+        m_tokens.prepend(yytoken);
+        yytoken = T_SEMICOLON;
+        goto again;
+    }
+
+    if (yytoken != EOF_SYMBOL)
+        return true;
+
+    return false;
+}