forked from qt-creator/qt-creator
153 lines
4.5 KiB
C++
153 lines
4.5 KiB
C++
/**************************************************************************
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**
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** This file is part of Qt Creator
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**
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** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
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**
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** Commercial Usage
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**
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt Commercial License Agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Nokia.
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**
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** GNU Lesser General Public License Usage
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**
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** If you are unsure which license is appropriate for your use, please
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** contact the sales department at http://qt.nokia.com/contact.
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**
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**************************************************************************/
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#include "qmlexpressionundercursor.h"
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#include <qmljs/parser/qmljsast_p.h>
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#include <qmljs/qmljsscanner.h>
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#include <QtGui/QTextBlock>
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#include <QDebug>
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using namespace QmlJS;
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using namespace QmlJS::AST;
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namespace {
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class ExpressionUnderCursor
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{
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QTextCursor _cursor;
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Scanner scanner;
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public:
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ExpressionUnderCursor()
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: start(0), end(0)
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{}
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int start, end;
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int startState(const QTextBlock &block) const
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{
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int state = block.previous().userState();
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if (state == -1)
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return 0;
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return state & 0xff;
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}
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QString operator()(const QTextCursor &cursor)
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{
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return process(cursor);
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}
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int startOfExpression(const QList<Token> &tokens) const
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{
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return startOfExpression(tokens, tokens.size() - 1);
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}
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int startOfExpression(const QList<Token> &tokens, int index) const
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{
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if (index != -1) {
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const Token &tk = tokens.at(index);
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if (tk.is(Token::Identifier)) {
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if (index > 0 && tokens.at(index - 1).is(Token::Dot))
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index = startOfExpression(tokens, index - 2);
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} else if (tk.is(Token::RightParenthesis)) {
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do { --index; }
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while (index != -1 && tokens.at(index).isNot(Token::LeftParenthesis));
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if (index > 0 && tokens.at(index - 1).is(Token::Identifier))
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index = startOfExpression(tokens, index - 1);
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} else if (tk.is(Token::RightBracket)) {
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do { --index; }
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while (index != -1 && tokens.at(index).isNot(Token::LeftBracket));
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if (index > 0 && tokens.at(index - 1).is(Token::Identifier))
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index = startOfExpression(tokens, index - 1);
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}
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}
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return index;
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}
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QString process(const QTextCursor &cursor)
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{
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_cursor = cursor;
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QTextBlock block = _cursor.block();
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const QString blockText = block.text().left(cursor.columnNumber());
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scanner.setScanComments(false);
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const QList<Token> tokens = scanner(blockText, startState(block));
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int start = startOfExpression(tokens);
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if (start == -1)
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return QString();
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const Token &tk = tokens.at(start);
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return blockText.mid(tk.begin(), tokens.last().end() - tk.begin());
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}
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};
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} // enf of anonymous namespace
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using namespace QmlJSEditor;
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using namespace QmlJSEditor::Internal;
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QmlExpressionUnderCursor::QmlExpressionUnderCursor()
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: _expressionNode(0), _expressionOffset(0), _expressionLength(0)
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{}
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QmlJS::AST::ExpressionNode *QmlExpressionUnderCursor::operator()(const QTextCursor &cursor)
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{
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_expressionNode = 0;
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_expressionOffset = -1;
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_expressionLength = -1;
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ExpressionUnderCursor expressionUnderCursor;
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_text = expressionUnderCursor(cursor);
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exprDoc = Document::create(QLatin1String("<expression>"));
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exprDoc->setSource(_text);
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exprDoc->parseExpression();
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_expressionNode = exprDoc->expression();
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_expressionOffset = cursor.block().position() + expressionUnderCursor.start;
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_expressionLength = expressionUnderCursor.end - expressionUnderCursor.start;
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return _expressionNode;
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}
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ExpressionNode *QmlExpressionUnderCursor::expressionNode() const
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{
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return _expressionNode;
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}
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