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/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** 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.
**
**************************************************************************/
#include "qmlexpressionundercursor.h"
#include <qmljs/parser/qmljsast_p.h>
#include <qmljs/qmljsscanner.h>
#include <QtGui/QTextBlock>
#include <QDebug>
using namespace QmlJS;
using namespace QmlJS::AST;
namespace {
class ExpressionUnderCursor
{
QTextCursor _cursor;
Scanner scanner;
public:
ExpressionUnderCursor()
: start(0), end(0)
{}
int start, end;
int startState(const QTextBlock &block) const
{
int state = block.previous().userState();
if (state == -1)
return 0;
return state & 0xff;
}
QString operator()(const QTextCursor &cursor)
{
return process(cursor);
}
int startOfExpression(const QList<Token> &tokens) const
{
return startOfExpression(tokens, tokens.size() - 1);
}
int startOfExpression(const QList<Token> &tokens, int index) const
{
if (index != -1) {
const Token &tk = tokens.at(index);
if (tk.is(Token::Identifier)) {
if (index > 0 && tokens.at(index - 1).is(Token::Dot))
index = startOfExpression(tokens, index - 2);
} else if (tk.is(Token::RightParenthesis)) {
do { --index; }
while (index != -1 && tokens.at(index).isNot(Token::LeftParenthesis));
if (index > 0 && tokens.at(index - 1).is(Token::Identifier))
index = startOfExpression(tokens, index - 1);
} else if (tk.is(Token::RightBracket)) {
do { --index; }
while (index != -1 && tokens.at(index).isNot(Token::LeftBracket));
if (index > 0 && tokens.at(index - 1).is(Token::Identifier))
index = startOfExpression(tokens, index - 1);
}
}
return index;
}
QString process(const QTextCursor &cursor)
{
_cursor = cursor;
QTextBlock block = _cursor.block();
const QString blockText = block.text().left(cursor.positionInBlock());
scanner.setScanComments(false);
const QList<Token> tokens = scanner(blockText, startState(block));
int start = startOfExpression(tokens);
if (start == -1)
return QString();
const Token &tk = tokens.at(start);
return blockText.mid(tk.begin(), tokens.last().end() - tk.begin());
}
};
} // enf of anonymous namespace
using namespace QmlJSEditor;
using namespace QmlJSEditor::Internal;
QmlExpressionUnderCursor::QmlExpressionUnderCursor()
: _expressionNode(0), _expressionOffset(0), _expressionLength(0)
{}
QmlJS::AST::ExpressionNode *QmlExpressionUnderCursor::operator()(const QTextCursor &cursor)
{
_expressionNode = 0;
_expressionOffset = -1;
_expressionLength = -1;
ExpressionUnderCursor expressionUnderCursor;
_text = expressionUnderCursor(cursor);
exprDoc = Document::create(QLatin1String("<expression>"));
exprDoc->setSource(_text);
exprDoc->parseExpression();
_expressionNode = exprDoc->expression();
_expressionOffset = cursor.block().position() + expressionUnderCursor.start;
_expressionLength = expressionUnderCursor.end - expressionUnderCursor.start;
return _expressionNode;
}
ExpressionNode *QmlExpressionUnderCursor::expressionNode() const
{
return _expressionNode;
}
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