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241
src/plugins/texteditor/tabsettings.cpp
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241
src/plugins/texteditor/tabsettings.cpp
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/***************************************************************************
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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) 2008 Nokia Corporation and/or its subsidiary(-ies).
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**
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** Contact: Qt Software Information (qt-info@nokia.com)
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**
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**
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** Non-Open Source Usage
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**
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** Licensees may use this file in accordance with the Qt Beta Version
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** License Agreement, Agreement version 2.2 provided with the Software or,
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** alternatively, in accordance with the terms contained in a written
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** agreement between you and Nokia.
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**
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** GNU General Public License Usage
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**
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** Alternatively, this file may be used under the terms of the GNU General
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** Public License versions 2.0 or 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the packaging
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** of this file. Please review the following information to ensure GNU
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** General Public Licensing requirements will be met:
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**
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** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
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** http://www.gnu.org/copyleft/gpl.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt GPL Exception version
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** 1.2, included in the file GPL_EXCEPTION.txt in this package.
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**
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***************************************************************************/
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#include "tabsettings.h"
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#include <QtCore/QSettings>
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#include <QtCore/QString>
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#include <QtGui/QTextCursor>
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#include <QtGui/QTextDocument>
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#include <QDebug>
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static const char* spacesForTabsKey = "SpacesForTabs";
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static const char* smartBackspaceKey = "SmartBackspace";
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static const char* autoIndentKey = "AutoIndent";
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static const char* tabSizeKey = "TabSize";
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static const char* indentSizeKey = "IndentSize";
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static const char* groupPostfix = "TabSettings";
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namespace TextEditor {
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TabSettings::TabSettings() :
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m_spacesForTabs(true),
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m_autoIndent(true),
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m_smartBackspace(false),
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m_tabSize(8),
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m_indentSize(4)
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{
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}
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void TabSettings::toSettings(const QString &category, QSettings *s) const
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{
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QString group = QLatin1String(groupPostfix);
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if (!category.isEmpty())
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group.insert(0, category);
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s->beginGroup(group);
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s->setValue(QLatin1String(spacesForTabsKey), m_spacesForTabs);
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s->setValue(QLatin1String(autoIndentKey), m_autoIndent);
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s->setValue(QLatin1String(smartBackspaceKey), m_smartBackspace);
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s->setValue(QLatin1String(tabSizeKey), m_tabSize);
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s->setValue(QLatin1String(indentSizeKey), m_indentSize);
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s->endGroup();
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}
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void TabSettings::fromSettings(const QString &category, const QSettings *s)
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{
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QString group = QLatin1String(groupPostfix);
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if (!category.isEmpty())
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group.insert(0, category);
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group += QLatin1Char('/');
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*this = TabSettings(); // Assign defaults
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m_spacesForTabs = s->value(group + QLatin1String(spacesForTabsKey), m_spacesForTabs).toBool();
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m_autoIndent = s->value(group + QLatin1String(autoIndentKey), m_autoIndent).toBool();
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m_smartBackspace = s->value(group + QLatin1String(smartBackspaceKey), m_smartBackspace).toBool();
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m_tabSize = s->value(group + QLatin1String(tabSizeKey), m_tabSize).toInt();
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m_indentSize = s->value(group + QLatin1String(indentSizeKey), m_indentSize).toInt();
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}
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int TabSettings::lineIndentPosition(const QString &text) const
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{
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int i = 0;
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while (i < text.size()) {
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if (!text.at(i).isSpace())
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break;
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++i;
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}
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int column = columnAt(text, i);
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return i - (column % m_indentSize);
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}
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int TabSettings::firstNonSpace(const QString &text) const
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{
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int i = 0;
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while (i < text.size()) {
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if (!text.at(i).isSpace())
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return i;
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++i;
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}
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return i;
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}
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int TabSettings::trailingWhitespaces(const QString &text) const
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{
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int i = 0;
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while (i < text.size()) {
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if (!text.at(text.size()-1-i).isSpace())
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return i;
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++i;
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}
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return i;
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}
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bool TabSettings::isIndentationClean(const QString &text) const
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{
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int i = 0;
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int spaceCount = 0;
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while (i < text.size()) {
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QChar c = text.at(i);
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if (!c.isSpace())
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return true;
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if (c == QLatin1Char(' ')) {
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++spaceCount;
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if (spaceCount == m_tabSize)
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return false;
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} else if (c == QLatin1Char('\t')) {
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if (m_spacesForTabs || spaceCount != m_indentSize)
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return false;
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spaceCount = 0;
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}
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++i;
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}
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return true;
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}
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int TabSettings::columnAt(const QString &text, int position) const
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{
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int column = 0;
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for (int i = 0; i < position; ++i) {
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if (text.at(i) == QLatin1Char('\t'))
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column = column - (column % m_tabSize) + m_tabSize;
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else
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++column;
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}
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return column;
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}
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int TabSettings::spacesLeftFromPosition(const QString &text, int position) const
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{
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int i = position;
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while (i > 0) {
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if (!text.at(i-1).isSpace())
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break;
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--i;
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}
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return position - i;
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}
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int TabSettings::indentedColumn(int column, bool doIndent) const
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{
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int aligned = (column / m_indentSize) * m_indentSize;
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if (doIndent)
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return aligned + m_indentSize;
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if (aligned < column)
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return aligned;
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return qMax(0, aligned - m_indentSize);
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}
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QString TabSettings::indentationString(int startColumn, int targetColumn) const
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{
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targetColumn = qMax(startColumn, targetColumn);
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if (m_spacesForTabs)
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return QString(targetColumn - startColumn, QLatin1Char(' '));
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QString s;
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int alignedStart = startColumn - (startColumn % m_tabSize) + m_tabSize;
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if (alignedStart > startColumn && alignedStart <= targetColumn) {
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s += QLatin1Char('\t');
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startColumn = alignedStart;
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}
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if (int columns = targetColumn - startColumn) {
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int tabs = columns / m_tabSize;
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s += QString(tabs, QLatin1Char('\t'));
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s += QString(columns - tabs * m_tabSize, QLatin1Char(' '));
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}
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return s;
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}
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void TabSettings::indentLine(QTextBlock block, int newIndent) const
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{
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const QString text = block.text();
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const int oldBlockLength = text.size();
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// Quickly check whether indenting is required.
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if (oldBlockLength == 0 && newIndent == 0)
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return;
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const QString indentString = indentationString(0, newIndent);
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newIndent = indentString.length();
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if (oldBlockLength == indentString.length() && text == indentString)
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return;
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if (oldBlockLength > indentString.length() &&
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text.startsWith(indentString) &&
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!text.at(indentString.length()).isSpace()) {
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return;
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}
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QTextCursor cursor(block);
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cursor.beginEditBlock();
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cursor.movePosition(QTextCursor::StartOfBlock);
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cursor.movePosition(QTextCursor::NextCharacter, QTextCursor::KeepAnchor, firstNonSpace(text));
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cursor.removeSelectedText();
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cursor.insertText(indentString);
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cursor.endEditBlock();
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}
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bool TabSettings::equals(const TabSettings &ts) const
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{
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return m_spacesForTabs == ts.m_spacesForTabs
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&& m_autoIndent == ts.m_autoIndent
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&& m_smartBackspace == ts.m_smartBackspace
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&& m_tabSize == ts.m_tabSize
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&& m_indentSize == ts.m_indentSize;
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}
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} // namespace TextEditor
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