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/**************************************************************************
**
** Copyright (c) 2013 Konstantin Tokarev <annulen@yandex.ru>
** Contact: http://www.qt-project.org/legal
**
** This file is part of Qt Creator.
**
** 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.
**
****************************************************************************/
#include "bracematcher.h"
#include <QTextDocument>
#include <QTextCursor>
/*!
\class Utils::BraceMatcher
\brief The BraceMatcher class implements a generic autocompleter of braces
and quotes.
This is a helper class for autocompleter implementations. To use it,
define \e brace, \e quote, and \e delimiter characters for a given language.
*/
namespace Utils {
/*!
* Adds a pair of characters, corresponding to \a opening and \a closing braces.
*/
void BraceMatcher::addBraceCharPair(const QChar opening, const QChar closing)
{
m_braceChars[opening] = closing;
}
/*!
* Adds a \a quote character.
*/
void BraceMatcher::addQuoteChar(const QChar quote)
{
m_quoteChars << quote;
}
/*!
* Adds a separator character \a sep that should be skipped when overtyping it.
* For example, it could be ';' or ',' in C-like languages.
*/
void BraceMatcher::addDelimiterChar(const QChar sep)
{
m_delimiterChars << sep;
}
bool BraceMatcher::shouldInsertMatchingText(const QTextCursor &tc) const
{
QTextDocument *doc = tc.document();
return shouldInsertMatchingText(doc->characterAt(tc.selectionEnd()));
}
bool BraceMatcher::shouldInsertMatchingText(const QChar lookAhead) const
{
return lookAhead.isSpace()
|| isQuote(lookAhead)
|| isDelimiter(lookAhead)
|| isClosingBrace(lookAhead);
}
QString BraceMatcher::insertMatchingBrace(const QTextCursor &cursor,
const QString &text,
const QChar la,
int *skippedChars) const
{
if (text.length() != 1)
return QString();
if (!shouldInsertMatchingText(cursor))
return QString();
const QChar ch = text.at(0);
if (isQuote(ch)) {
if (la != ch)
return QString(ch);
++*skippedChars;
return QString();
}
if (isOpeningBrace(ch))
return QString(m_braceChars[ch]);
if (isDelimiter(ch) || isClosingBrace(ch)) {
if (la == ch)
++*skippedChars;
}
return QString();
}
/*!
* Returns true if the character \a c was added as one of character types.
*/
bool BraceMatcher::isKnownChar(const QChar c) const
{
return isQuote(c) || isDelimiter(c) || isOpeningBrace(c) || isClosingBrace(c);
}
} // namespace Utils
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