Initial import

src/libs/cplusplus/TokenUnderCursor.cpp

@@ -0,0 +1,75 @@
+/***************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact:  Qt Software Information (qt-info@nokia.com)
+**
+** 
+** Non-Open Source Usage  
+** 
+** Licensees may use this file in accordance with the Qt Beta Version
+** License Agreement, Agreement version 2.2 provided with the Software or,
+** alternatively, in accordance with the terms contained in a written
+** agreement between you and Nokia.  
+** 
+** GNU General Public License Usage 
+** 
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License versions 2.0 or 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 GNU
+** General Public Licensing requirements will be met:
+**
+** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt GPL Exception version
+** 1.2, included in the file GPL_EXCEPTION.txt in this package.  
+** 
+***************************************************************************/
+
+#include "TokenUnderCursor.h"
+#include <Token.h>
+
+#include <QTextCursor>
+#include <QTextBlock>
+#include <climits>
+
+using namespace CPlusPlus;
+
+TokenUnderCursor::TokenUnderCursor()
+{ }
+
+TokenUnderCursor::~TokenUnderCursor()
+{ }
+
+SimpleToken TokenUnderCursor::operator()(const QTextCursor &cursor) const
+{
+    SimpleLexer tokenize;
+    QTextBlock block = cursor.block();
+    int column = cursor.columnNumber();
+
+    QList<SimpleToken> tokens = tokenize(block.text(), previousBlockState(block));
+    for (int index = tokens.size() - 1; index != -1; --index) {
+        const SimpleToken &tk = tokens.at(index);
+        if (tk.position() < column)
+            return tk;
+    }
+
+    return SimpleToken();
+}
+
+int TokenUnderCursor::previousBlockState(const QTextBlock &block) const
+{
+    const QTextBlock prevBlock = block.previous();
+    if (prevBlock.isValid()) {
+        int state = prevBlock.userState();
+
+        if (state != -1)
+            return state;
+    }
+    return 0;
+}