forked from qt-creator/qt-creator
106 lines
3.5 KiB
C++
106 lines
3.5 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) 2009 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 "BackwardsScanner.h"
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#include <QtGui/QTextCursor>
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using namespace CPlusPlus;
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BackwardsScanner::BackwardsScanner(const QTextCursor &cursor, int maxBlockCount)
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: _offset(0)
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, _blocksTokenized(0)
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, _block(cursor.block())
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, _maxBlockCount(maxBlockCount)
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{
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_tokenize.setSkipComments(true);
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_text = _block.text().left(cursor.position() - cursor.block().position());
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_tokens.append(_tokenize(_text, previousBlockState(_block)));
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}
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QList<SimpleToken> BackwardsScanner::tokens() const
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{ return _tokens; }
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const SimpleToken &BackwardsScanner::operator[](int i)
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{
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while (_offset + i < 0) {
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_block = _block.previous();
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if (_blocksTokenized == _maxBlockCount || !_block.isValid()) {
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++_offset;
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_tokens.prepend(SimpleToken()); // sentinel
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break;
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} else {
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++_blocksTokenized;
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QString blockText = _block.text();
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_text.prepend(blockText);
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QList<SimpleToken> adaptedTokens;
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for (int i = 0; i < _tokens.size(); ++i) {
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const SimpleToken &t = _tokens.at(i);
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const int position = t.position() + blockText.length();
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adaptedTokens.append(SimpleToken(t.kind(),
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position,
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t.length(),
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_text.midRef(position, t.length())));
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}
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_tokens = _tokenize(blockText, previousBlockState(_block));
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_offset += _tokens.size();
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_tokens += adaptedTokens;
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}
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}
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return _tokens.at(_offset + i);
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}
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int BackwardsScanner::startPosition() const
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{ return _block.position(); }
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const QString &BackwardsScanner::text() const
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{ return _text; }
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QString BackwardsScanner::text(int begin, int end) const
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{
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const SimpleToken &firstToken = _tokens.at(begin + _offset);
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const SimpleToken &lastToken = _tokens.at(end + _offset - 1);
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return _text.mid(firstToken.begin(), lastToken.end() - firstToken.begin());
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}
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int BackwardsScanner::previousBlockState(const QTextBlock &block)
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{
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const QTextBlock prevBlock = block.previous();
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if (prevBlock.isValid()) {
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int state = prevBlock.userState();
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if (state != -1)
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return state;
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}
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return 0;
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}
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