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/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** Commercial Usage
**
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** 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.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
**
**************************************************************************/
#include "completionsupport.h"
#include "completionwidget.h"
#include "icompletioncollector.h"
#include <coreplugin/icore.h>
#include <extensionsystem/pluginmanager.h>
#include <texteditor/itexteditable.h>
#include <utils/qtcassert.h>
#include <QtCore/QString>
#include <QtCore/QList>
#include <algorithm>
using namespace TextEditor;
using namespace TextEditor::Internal;
CompletionSupport *CompletionSupport::instance()
{
static CompletionSupport *m_instance = 0;
if (!m_instance)
m_instance = new CompletionSupport;
return m_instance;
}
CompletionSupport::CompletionSupport()
: QObject(Core::ICore::instance()),
m_completionList(0),
m_startPosition(0),
m_checkCompletionTrigger(false),
m_editor(0),
m_completionCollector(0)
{
m_completionCollectors = ExtensionSystem::PluginManager::instance()
->getObjects<ICompletionCollector>();
}
void CompletionSupport::performCompletion(const CompletionItem &item)
{
item.m_collector->complete(item);
m_checkCompletionTrigger = true;
}
void CompletionSupport::cleanupCompletions()
{
if (m_completionList)
disconnect(m_completionList, SIGNAL(destroyed(QObject*)),
this, SLOT(cleanupCompletions()));
m_completionList = 0;
m_completionCollector->cleanup();
if (m_checkCompletionTrigger) {
m_checkCompletionTrigger = false;
// Only check for completion trigger when some text was entered
if (m_editor->position() > m_startPosition)
autoComplete(m_editor, false);
}
}
void CompletionSupport::autoComplete(ITextEditable *editor, bool forced)
{
autoComplete_helper(editor, forced, /*quickFix = */ false);
}
void CompletionSupport::quickFix(ITextEditable *editor)
{
autoComplete_helper(editor,
/*forced = */ true,
/*quickFix = */ true);
}
void CompletionSupport::autoComplete_helper(ITextEditable *editor, bool forced,
bool quickFix)
{
m_completionCollector = 0;
foreach (ICompletionCollector *collector, m_completionCollectors) {
if (quickFix)
collector = qobject_cast<IQuickFixCollector *>(collector);
if (collector && collector->supportsEditor(editor)) {
m_completionCollector = collector;
break;
}
}
if (!m_completionCollector)
return;
m_editor = editor;
QList<CompletionItem> completionItems;
if (!m_completionList) {
if (!forced && !m_completionCollector->triggersCompletion(editor))
return;
m_startPosition = m_completionCollector->startCompletion(editor);
completionItems = getCompletions();
QTC_ASSERT(!(m_startPosition == -1 && completionItems.size() > 0), return);
if (completionItems.isEmpty()) {
cleanupCompletions();
return;
}
m_completionList = new CompletionWidget(this, editor);
m_completionList->setQuickFix(quickFix);
connect(m_completionList, SIGNAL(itemSelected(TextEditor::CompletionItem)),
this, SLOT(performCompletion(TextEditor::CompletionItem)));
connect(m_completionList, SIGNAL(completionListClosed()),
this, SLOT(cleanupCompletions()));
// Make sure to clean up the completions if the list is destroyed without
// emitting completionListClosed (can happen when no focus out event is received,
// for example when switching applications on the Mac)
connect(m_completionList, SIGNAL(destroyed(QObject*)),
this, SLOT(cleanupCompletions()));
} else {
completionItems = getCompletions();
if (completionItems.isEmpty()) {
m_completionList->closeList();
return;
}
}
m_completionList->setCompletionItems(completionItems);
// Partially complete when completion was forced
if (forced && m_completionCollector->partiallyComplete(completionItems)) {
m_checkCompletionTrigger = true;
m_completionList->closeList();
} else {
m_completionList->showCompletions(m_startPosition);
}
}
static bool compareChar(const QChar &l, const QChar &r)
{
if (l == QLatin1Char('_'))
return false;
else if (r == QLatin1Char('_'))
return true;
else
return l < r;
}
static bool lessThan(const QString &l, const QString &r)
{
return std::lexicographical_compare(l.begin(), l.end(),
r.begin(), r.end(),
compareChar);
}
static bool completionItemLessThan(const CompletionItem &i1, const CompletionItem &i2)
{
// The order is case-insensitive in principle, but case-sensitive when this would otherwise mean equality
const QString lower1 = i1.m_text.toLower();
const QString lower2 = i2.m_text.toLower();
if (lower1 == lower2)
return lessThan(i1.m_text, i2.m_text);
else
return lessThan(lower1, lower2);
}
QList<CompletionItem> CompletionSupport::getCompletions() const
{
QList<CompletionItem> completionItems;
m_completionCollector->completions(&completionItems);
qStableSort(completionItems.begin(), completionItems.end(), completionItemLessThan);
// Remove duplicates
QString lastKey;
QList<CompletionItem> uniquelist;
foreach (const CompletionItem &item, completionItems) {
if (item.m_text != lastKey) {
uniquelist.append(item);
lastKey = item.m_text;
} else {
uniquelist.last().m_duplicateCount++;
}
}
return uniquelist;
}
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