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abdd404ff5ec8539f0d3fd38139eb08ad8a03d66
qt-creator/src/plugins/cpptools/cppcodecompletion.cpp
Friedemann Kleint f672bff338 Fix some code scanning issues. 
foreach()-Loops.
2010-02-01 14:00:07 +01:00

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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://qt.nokia.com/contact.
**
**************************************************************************/
#include "cppcodecompletion.h"
#include "cppmodelmanager.h"
#include "cppdoxygen.h"
#include "cpptoolsconstants.h"
#include "cpptoolseditorsupport.h"
#include <Control.h>
#include <AST.h>
#include <ASTVisitor.h>
#include <CoreTypes.h>
#include <Literals.h>
#include <Names.h>
#include <NameVisitor.h>
#include <Symbols.h>
#include <SymbolVisitor.h>
#include <Scope.h>
#include <TranslationUnit.h>
#include <cplusplus/ResolveExpression.h>
#include <cplusplus/LookupContext.h>
#include <cplusplus/MatchingText.h>
#include <cplusplus/Overview.h>
#include <cplusplus/ExpressionUnderCursor.h>
#include <cplusplus/BackwardsScanner.h>
#include <cplusplus/TokenUnderCursor.h>
#include <coreplugin/icore.h>
#include <coreplugin/mimedatabase.h>
#include <coreplugin/editormanager/editormanager.h>
#include <texteditor/itexteditor.h>
#include <texteditor/itexteditable.h>
#include <texteditor/basetexteditor.h>
#include <projectexplorer/projectexplorer.h>
#include <utils/qtcassert.h>
#include <QtCore/QDebug>
#include <QtCore/QMap>
#include <QtCore/QFile>
#include <QtGui/QAction>
#include <QtGui/QApplication>
#include <QtGui/QDesktopWidget>
#include <QtGui/QKeyEvent>
#include <QtGui/QLabel>
#include <QtGui/QStyleOption>
#include <QtGui/QStylePainter>
#include <QtGui/QTextDocument> // Qt::escape()
#include <QtGui/QToolButton>
#include <QtGui/QVBoxLayout>
using namespace CPlusPlus;
namespace CppTools {
namespace Internal {
class FakeToolTipFrame : public QWidget
{
public:
FakeToolTipFrame(QWidget *parent = 0) :
QWidget(parent, Qt::ToolTip | Qt::WindowStaysOnTopHint)
{
setFocusPolicy(Qt::NoFocus);
setAttribute(Qt::WA_DeleteOnClose);
// Set the window and button text to the tooltip text color, since this
// widget draws the background as a tooltip.
QPalette p = palette();
const QColor toolTipTextColor = p.color(QPalette::Inactive, QPalette::ToolTipText);
p.setColor(QPalette::Inactive, QPalette::WindowText, toolTipTextColor);
p.setColor(QPalette::Inactive, QPalette::ButtonText, toolTipTextColor);
setPalette(p);
}
protected:
void paintEvent(QPaintEvent *e);
void resizeEvent(QResizeEvent *e);
};
class FunctionArgumentWidget : public QLabel
{
Q_OBJECT
public:
FunctionArgumentWidget();
void showFunctionHint(QList<Function *> functionSymbols,
const LookupContext &context,
int startPosition);
protected:
bool eventFilter(QObject *obj, QEvent *e);
private slots:
void nextPage();
void previousPage();
private:
void updateArgumentHighlight();
void updateHintText();
Function *currentFunction() const
{ return m_items.at(m_current); }
int m_startpos;
int m_currentarg;
int m_current;
bool m_escapePressed;
TextEditor::ITextEditor *m_editor;
QWidget *m_pager;
QLabel *m_numberLabel;
FakeToolTipFrame *m_popupFrame;
QList<Function *> m_items;
LookupContext m_context;
};
class ConvertToCompletionItem: protected NameVisitor
{
// The completion collector.
CppCodeCompletion *_collector;
// The completion item.
TextEditor::CompletionItem _item;
// The current symbol.
Symbol *_symbol;
// The pretty printer.
Overview overview;
public:
ConvertToCompletionItem(CppCodeCompletion *collector)
: _collector(collector),
_item(0),
_symbol(0)
{ }
TextEditor::CompletionItem operator()(Symbol *symbol)
{
if (! symbol || ! symbol->name() || symbol->name()->isQualifiedNameId())
return 0;
TextEditor::CompletionItem previousItem = switchCompletionItem(0);
Symbol *previousSymbol = switchSymbol(symbol);
accept(symbol->identity());
if (_item)
_item.data = QVariant::fromValue(symbol);
(void) switchSymbol(previousSymbol);
return switchCompletionItem(previousItem);
}
protected:
Symbol *switchSymbol(Symbol *symbol)
{
Symbol *previousSymbol = _symbol;
_symbol = symbol;
return previousSymbol;
}
TextEditor::CompletionItem switchCompletionItem(TextEditor::CompletionItem item)
{
TextEditor::CompletionItem previousItem = _item;
_item = item;
return previousItem;
}
TextEditor::CompletionItem newCompletionItem(const Name *name)
{
TextEditor::CompletionItem item(_collector);
item.text = overview.prettyName(name);
item.icon = _collector->iconForSymbol(_symbol);
return item;
}
virtual void visit(const NameId *name)
{ _item = newCompletionItem(name); }
virtual void visit(const TemplateNameId *name)
{
_item = newCompletionItem(name);
_item.text = QLatin1String(name->identifier()->chars());
}
virtual void visit(const DestructorNameId *name)
{ _item = newCompletionItem(name); }
virtual void visit(const OperatorNameId *name)
{ _item = newCompletionItem(name); }
virtual void visit(const ConversionNameId *name)
{ _item = newCompletionItem(name); }
virtual void visit(const QualifiedNameId *name)
{ _item = newCompletionItem(name->unqualifiedNameId()); }
};
struct CompleteFunctionDeclaration
{
explicit CompleteFunctionDeclaration(Function *f = 0)
: function(f)
{}
Function *function;
};
} // namespace Internal
} // namespace CppTools
using namespace CppTools::Internal;
Q_DECLARE_METATYPE(CompleteFunctionDeclaration)
void FakeToolTipFrame::paintEvent(QPaintEvent *)
{
QStylePainter p(this);
QStyleOptionFrame opt;
opt.init(this);
p.drawPrimitive(QStyle::PE_PanelTipLabel, opt);
p.end();
}
void FakeToolTipFrame::resizeEvent(QResizeEvent *)
{
QStyleHintReturnMask frameMask;
QStyleOption option;
option.init(this);
if (style()->styleHint(QStyle::SH_ToolTip_Mask, &option, this, &frameMask))
setMask(frameMask.region);
}
FunctionArgumentWidget::FunctionArgumentWidget():
m_startpos(-1),
m_current(0),
m_escapePressed(false)
{
QObject *editorObject = Core::EditorManager::instance()->currentEditor();
m_editor = qobject_cast<TextEditor::ITextEditor *>(editorObject);
m_popupFrame = new FakeToolTipFrame(m_editor->widget());
QToolButton *downArrow = new QToolButton;
downArrow->setArrowType(Qt::DownArrow);
downArrow->setFixedSize(16, 16);
downArrow->setAutoRaise(true);
QToolButton *upArrow = new QToolButton;
upArrow->setArrowType(Qt::UpArrow);
upArrow->setFixedSize(16, 16);
upArrow->setAutoRaise(true);
setParent(m_popupFrame);
setFocusPolicy(Qt::NoFocus);
m_pager = new QWidget;
QHBoxLayout *hbox = new QHBoxLayout(m_pager);
hbox->setMargin(0);
hbox->setSpacing(0);
hbox->addWidget(upArrow);
m_numberLabel = new QLabel;
hbox->addWidget(m_numberLabel);
hbox->addWidget(downArrow);
QHBoxLayout *layout = new QHBoxLayout;
layout->setMargin(0);
layout->setSpacing(0);
layout->addWidget(m_pager);
layout->addWidget(this);
m_popupFrame->setLayout(layout);
connect(upArrow, SIGNAL(clicked()), SLOT(previousPage()));
connect(downArrow, SIGNAL(clicked()), SLOT(nextPage()));
setTextFormat(Qt::RichText);
setMargin(1);
qApp->installEventFilter(this);
}
void FunctionArgumentWidget::showFunctionHint(QList<Function *> functionSymbols,
const LookupContext &context,
int startPosition)
{
Q_ASSERT(!functionSymbols.isEmpty());
if (m_startpos == startPosition)
return;
m_pager->setVisible(functionSymbols.size() > 1);
m_items = functionSymbols;
m_context = context;
m_startpos = startPosition;
m_current = 0;
m_escapePressed = false;
// update the text
m_currentarg = -1;
updateArgumentHighlight();
m_popupFrame->show();
}
void FunctionArgumentWidget::nextPage()
{
m_current = (m_current + 1) % m_items.size();
updateHintText();
}
void FunctionArgumentWidget::previousPage()
{
if (m_current == 0)
m_current = m_items.size() - 1;
else
--m_current;
updateHintText();
}
void FunctionArgumentWidget::updateArgumentHighlight()
{
int curpos = m_editor->position();
if (curpos < m_startpos) {
m_popupFrame->close();
return;
}
QString str = m_editor->textAt(m_startpos, curpos - m_startpos);
int argnr = 0;
int parcount = 0;
SimpleLexer tokenize;
QList<SimpleToken> tokens = tokenize(str);
for (int i = 0; i < tokens.count(); ++i) {
const SimpleToken &tk = tokens.at(i);
if (tk.is(T_LPAREN))
++parcount;
else if (tk.is(T_RPAREN))
--parcount;
else if (! parcount && tk.is(T_COMMA))
++argnr;
}
if (m_currentarg != argnr) {
m_currentarg = argnr;
updateHintText();
}
if (parcount < 0)
m_popupFrame->close();
}
bool FunctionArgumentWidget::eventFilter(QObject *obj, QEvent *e)
{
switch (e->type()) {
case QEvent::ShortcutOverride:
if (static_cast<QKeyEvent*>(e)->key() == Qt::Key_Escape) {
m_escapePressed = true;
}
break;
case QEvent::KeyPress:
if (static_cast<QKeyEvent*>(e)->key() == Qt::Key_Escape) {
m_escapePressed = true;
}
if (m_items.size() > 1) {
QKeyEvent *ke = static_cast<QKeyEvent*>(e);
if (ke->key() == Qt::Key_Up) {
previousPage();
return true;
} else if (ke->key() == Qt::Key_Down) {
nextPage();
return true;
}
return false;
}
break;
case QEvent::KeyRelease:
if (static_cast<QKeyEvent*>(e)->key() == Qt::Key_Escape && m_escapePressed) {
m_popupFrame->close();
return false;
}
updateArgumentHighlight();
break;
case QEvent::WindowDeactivate:
case QEvent::FocusOut:
if (obj != m_editor->widget())
break;
m_popupFrame->close();
break;
case QEvent::MouseButtonPress:
case QEvent::MouseButtonRelease:
case QEvent::MouseButtonDblClick:
case QEvent::Wheel: {
QWidget *widget = qobject_cast<QWidget *>(obj);
if (! (widget == this || m_popupFrame->isAncestorOf(widget))) {
m_popupFrame->close();
}
}
break;
default:
break;
}
return false;
}
void FunctionArgumentWidget::updateHintText()
{
Overview overview;
overview.setShowReturnTypes(true);
overview.setShowArgumentNames(true);
overview.setMarkedArgument(m_currentarg + 1);
Function *f = currentFunction();
const QString prettyMethod = overview(f->type(), f->name());
const int begin = overview.markedArgumentBegin();
const int end = overview.markedArgumentEnd();
QString hintText;
hintText += Qt::escape(prettyMethod.left(begin));
hintText += "<b>";
hintText += Qt::escape(prettyMethod.mid(begin, end - begin));
hintText += "</b>";
hintText += Qt::escape(prettyMethod.mid(end));
setText(hintText);
m_numberLabel->setText(tr("%1 of %2").arg(m_current + 1).arg(m_items.size()));
m_popupFrame->setFixedWidth(m_popupFrame->minimumSizeHint().width());
const QDesktopWidget *desktop = QApplication::desktop();
#ifdef Q_WS_MAC
const QRect screen = desktop->availableGeometry(desktop->screenNumber(m_editor->widget()));
#else
const QRect screen = desktop->screenGeometry(desktop->screenNumber(m_editor->widget()));
#endif
const QSize sz = m_popupFrame->sizeHint();
QPoint pos = m_editor->cursorRect(m_startpos).topLeft();
pos.setY(pos.y() - sz.height() - 1);
if (pos.x() + sz.width() > screen.right())
pos.setX(screen.right() - sz.width());
m_popupFrame->move(pos);
}
CppCodeCompletion::CppCodeCompletion(CppModelManager *manager)
: ICompletionCollector(manager),
m_manager(manager),
m_editor(0),
m_startPosition(-1),
m_caseSensitivity(FirstLetterCaseSensitive),
m_autoInsertBrackets(true),
m_partialCompletionEnabled(true),
m_forcedCompletion(false),
m_completionOperator(T_EOF_SYMBOL),
m_objcEnabled(true)
{
}
QIcon CppCodeCompletion::iconForSymbol(Symbol *symbol) const
{
return m_icons.iconForSymbol(symbol);
}
CppCodeCompletion::CaseSensitivity CppCodeCompletion::caseSensitivity() const
{
return m_caseSensitivity;
}
void CppCodeCompletion::setCaseSensitivity(CaseSensitivity caseSensitivity)
{
m_caseSensitivity = caseSensitivity;
}
bool CppCodeCompletion::autoInsertBrackets() const
{
return m_autoInsertBrackets;
}
void CppCodeCompletion::setAutoInsertBrackets(bool autoInsertBrackets)
{
m_autoInsertBrackets = autoInsertBrackets;
}
bool CppCodeCompletion::isPartialCompletionEnabled() const
{
return m_partialCompletionEnabled;
}
void CppCodeCompletion::setPartialCompletionEnabled(bool partialCompletionEnabled)
{
m_partialCompletionEnabled = partialCompletionEnabled;
}
/*
Searches backwards for an access operator.
*/
static int startOfOperator(TextEditor::ITextEditable *editor,
int pos, unsigned *kind,
bool wantFunctionCall)
{
const QChar ch = pos > -1 ? editor->characterAt(pos - 1) : QChar();
const QChar ch2 = pos > 0 ? editor->characterAt(pos - 2) : QChar();
const QChar ch3 = pos > 1 ? editor->characterAt(pos - 3) : QChar();
int start = pos;
int completionKind = T_EOF_SYMBOL;
switch (ch.toLatin1()) {
case '.':
if (ch2 != QLatin1Char('.')) {
completionKind = T_DOT;
--start;
}
break;
case ',':
completionKind = T_COMMA;
--start;
break;
case '(':
if (wantFunctionCall) {
completionKind = T_LPAREN;
--start;
}
break;
case ':':
if (ch3 != QLatin1Char(':') && ch2 == QLatin1Char(':')) {
completionKind = T_COLON_COLON;
start -= 2;
}
break;
case '>':
if (ch2 == QLatin1Char('-')) {
completionKind = T_ARROW;
start -= 2;
}
break;
case '*':
if (ch2 == QLatin1Char('.')) {
completionKind = T_DOT_STAR;
start -= 2;
} else if (ch3 == QLatin1Char('-') && ch2 == QLatin1Char('>')) {
completionKind = T_ARROW_STAR;
start -= 3;
}
break;
case '\\':
case '@':
if (ch2.isNull() || ch2.isSpace()) {
completionKind = T_DOXY_COMMENT;
--start;
}
break;
case '<':
completionKind = T_ANGLE_STRING_LITERAL;
--start;
break;
case '"':
completionKind = T_STRING_LITERAL;
--start;
break;
case '/':
completionKind = T_SLASH;
--start;
break;
}
if (start == pos)
return start;
TextEditor::BaseTextEditor *edit = qobject_cast<TextEditor::BaseTextEditor *>(editor->widget());
QTextCursor tc(edit->textCursor());
tc.setPosition(pos);
// Include completion: make sure the quote character is the first one on the line
if (completionKind == T_STRING_LITERAL) {
QTextCursor s = tc;
s.movePosition(QTextCursor::StartOfLine, QTextCursor::KeepAnchor);
QString sel = s.selectedText();
if (sel.indexOf(QLatin1Char('"')) < sel.length() - 1) {
completionKind = T_EOF_SYMBOL;
start = pos;
}
}
if (completionKind == T_COMMA) {
ExpressionUnderCursor expressionUnderCursor;
if (expressionUnderCursor.startOfFunctionCall(tc) == -1) {
completionKind = T_EOF_SYMBOL;
start = pos;
}
}
static CPlusPlus::TokenUnderCursor tokenUnderCursor;
const SimpleToken tk = tokenUnderCursor(tc);
if (completionKind == T_DOXY_COMMENT && !(tk.is(T_DOXY_COMMENT) || tk.is(T_CPP_DOXY_COMMENT))) {
completionKind = T_EOF_SYMBOL;
start = pos;
}
// Don't complete in comments or strings, but still check for include completion
else if (tk.is(T_COMMENT) || tk.is(T_CPP_COMMENT) ||
(tk.isLiteral() && (completionKind != T_STRING_LITERAL
&& completionKind != T_ANGLE_STRING_LITERAL
&& completionKind != T_SLASH))) {
completionKind = T_EOF_SYMBOL;
start = pos;
}
// Include completion: can be triggered by slash, but only in a string
else if (completionKind == T_SLASH && (tk.isNot(T_STRING_LITERAL) && tk.isNot(T_ANGLE_STRING_LITERAL))) {
completionKind = T_EOF_SYMBOL;
start = pos;
}
else if (completionKind == T_LPAREN) {
const QList<SimpleToken> &tokens = tokenUnderCursor.tokens();
int i = 0;
for (; i < tokens.size(); ++i) {
const SimpleToken &token = tokens.at(i);
if (token.position() == tk.position()) {
if (i == 0) // no token on the left, but might be on a previous line
break;
const SimpleToken &previousToken = tokens.at(i - 1);
if (previousToken.is(T_IDENTIFIER) || previousToken.is(T_GREATER)
|| previousToken.is(T_SIGNAL) || previousToken.is(T_SLOT))
break;
}
}
if (i == tokens.size()) {
completionKind = T_EOF_SYMBOL;
start = pos;
}
}
// Check for include preprocessor directive
else if (completionKind == T_STRING_LITERAL || completionKind == T_ANGLE_STRING_LITERAL || completionKind == T_SLASH) {
bool include = false;
const QList<SimpleToken> &tokens = tokenUnderCursor.tokens();
if (tokens.size() >= 3) {
if (tokens.at(0).is(T_POUND) && tokens.at(1).is(T_IDENTIFIER) && (tokens.at(2).is(T_STRING_LITERAL) ||
tokens.at(2).is(T_ANGLE_STRING_LITERAL))) {
QStringRef directive = tokens.at(1).text();
if (directive == QLatin1String("include") ||
directive == QLatin1String("include_next") ||
directive == QLatin1String("import")) {
include = true;
}
}
}
if (!include) {
completionKind = T_EOF_SYMBOL;
start = pos;
}
}
if (kind)
*kind = completionKind;
return start;
}
bool CppCodeCompletion::supportsEditor(TextEditor::ITextEditable *editor)
{ return m_manager->isCppEditor(editor); }
TextEditor::ITextEditable *CppCodeCompletion::editor() const
{ return m_editor; }
int CppCodeCompletion::startPosition() const
{ return m_startPosition; }
bool CppCodeCompletion::triggersCompletion(TextEditor::ITextEditable *editor)
{
const int pos = editor->position();
if (startOfOperator(editor, pos, /*token =*/ 0, /*want function call=*/ true) != pos) {
return true;
}
return false;
}
int CppCodeCompletion::startCompletion(TextEditor::ITextEditable *editor)
{
TextEditor::BaseTextEditor *edit = qobject_cast<TextEditor::BaseTextEditor *>(editor->widget());
if (! edit)
return -1;
m_editor = editor;
const int startOfName = findStartOfName();
m_startPosition = startOfName;
m_completionOperator = T_EOF_SYMBOL;
int endOfOperator = m_startPosition;
// Skip whitespace preceding this position
while (editor->characterAt(endOfOperator - 1).isSpace())
--endOfOperator;
int endOfExpression = startOfOperator(editor, endOfOperator,
&m_completionOperator,
/*want function call =*/ true);
Core::IFile *file = editor->file();
QString fileName = file->fileName();
int line = 0, column = 0;
edit->convertPosition(editor->position(), &line, &column);
// qDebug() << "line:" << line << "column:" << column;
if (m_completionOperator == T_DOXY_COMMENT) {
for (int i = 1; i < T_DOXY_LAST_TAG; ++i) {
TextEditor::CompletionItem item(this);
item.text.append(QString::fromLatin1(doxygenTagSpell(i)));
item.icon = m_icons.keywordIcon();
m_completions.append(item);
}
return m_startPosition;
}
// Include completion
if (m_completionOperator == T_STRING_LITERAL
|| m_completionOperator == T_ANGLE_STRING_LITERAL
|| m_completionOperator == T_SLASH) {
QTextCursor c = edit->textCursor();
c.setPosition(endOfExpression);
if (completeInclude(c))
m_startPosition = startOfName;
return m_startPosition;
}
ExpressionUnderCursor expressionUnderCursor;
QTextCursor tc(edit->document());
if (m_completionOperator == T_COMMA) {
tc.setPosition(endOfExpression);
const int start = expressionUnderCursor.startOfFunctionCall(tc);
if (start == -1) {
m_completionOperator = T_EOF_SYMBOL;
return -1;
}
endOfExpression = start;
m_startPosition = start + 1;
m_completionOperator = T_LPAREN;
}
QString expression;
tc.setPosition(endOfExpression);
if (m_completionOperator) {
expression = expressionUnderCursor(tc);
if (m_completionOperator == T_LPAREN) {
if (expression.endsWith(QLatin1String("SIGNAL")))
m_completionOperator = T_SIGNAL;
else if (expression.endsWith(QLatin1String("SLOT")))
m_completionOperator = T_SLOT;
else if (editor->position() != endOfOperator) {
// We don't want a function completion when the cursor isn't at the opening brace
expression.clear();
m_completionOperator = T_EOF_SYMBOL;
m_startPosition = startOfName;
}
}
}
//qDebug() << "***** expression:" << expression;
return startCompletionInternal(edit, fileName, line, column, expression, endOfExpression);
}
int CppCodeCompletion::startCompletionInternal(TextEditor::BaseTextEditor *edit,
const QString fileName,
unsigned line, unsigned column,
const QString &expr,
int endOfExpression)
{
QString expression = expr.trimmed();
const Snapshot snapshot = m_manager->snapshot();
Document::Ptr thisDocument = snapshot.document(fileName);
if (! thisDocument)
return -1;
typeOfExpression.setSnapshot(snapshot);
Symbol *lastVisibleSymbol = thisDocument->findSymbolAt(line, column);
if (expression.isEmpty()) {
if (m_completionOperator == T_EOF_SYMBOL || m_completionOperator == T_COLON_COLON)
return globalCompletion(lastVisibleSymbol, thisDocument, snapshot);
else if (m_completionOperator == T_SIGNAL || m_completionOperator == T_SLOT) {
// Apply signal/slot completion on 'this'
expression = QLatin1String("this");
}
}
QList<LookupItem> results = typeOfExpression(expression, thisDocument, lastVisibleSymbol);
LookupContext context = typeOfExpression.lookupContext();
if (results.isEmpty()) {
if (m_completionOperator == T_SIGNAL || m_completionOperator == T_SLOT) {
if (! (expression.isEmpty() || expression == QLatin1String("this"))) {
expression = QLatin1String("this");
results = typeOfExpression(expression, thisDocument, lastVisibleSymbol);
}
if (results.isEmpty())
return -1;
context = typeOfExpression.lookupContext();
} else if (m_completionOperator == T_LPAREN) {
// Find the expression that precedes the current name
int index = endOfExpression;
while (m_editor->characterAt(index - 1).isSpace())
--index;
index = findStartOfName(index);
QTextCursor tc(edit->document());
tc.setPosition(index);
ExpressionUnderCursor expressionUnderCursor;
const QString baseExpression = expressionUnderCursor(tc);
// Resolve the type of this expression
const QList<LookupItem> results =
typeOfExpression(baseExpression, thisDocument,
lastVisibleSymbol,
TypeOfExpression::Preprocess);
// If it's a class, add completions for the constructors
foreach (const LookupItem &result, results) {
if (result.type()->isClassType()) {
if (completeConstructorOrFunction(results, context, endOfExpression, true))
return m_startPosition;
break;
}
}
return -1;
} else {
// nothing to do.
return -1;
}
}
switch (m_completionOperator) {
case T_LPAREN:
if (completeConstructorOrFunction(results, context, endOfExpression, false))
return m_startPosition;
break;
case T_DOT:
case T_ARROW:
if (completeMember(results, context))
return m_startPosition;
break;
case T_COLON_COLON:
if (completeScope(results, context))
return m_startPosition;
break;
case T_SIGNAL:
if (completeSignal(results, context))
return m_startPosition;
break;
case T_SLOT:
if (completeSlot(results, context))
return m_startPosition;
break;
default:
break;
} // end of switch
// nothing to do.
return -1;
}
int CppCodeCompletion::globalCompletion(Symbol *lastVisibleSymbol,
Document::Ptr thisDocument,
const Snapshot &snapshot)
{
if (m_completionOperator == T_EOF_SYMBOL) {
addKeywords();
addMacros(thisDocument->fileName(), snapshot);
}
Document::Ptr exprDoc = Document::create(QLatin1String("<expression>"));
const LookupContext context(lastVisibleSymbol, exprDoc, thisDocument, snapshot);
const QList<Scope *> scopes = context.expand(context.visibleScopes());
foreach (Scope *scope, scopes) {
for (unsigned i = 0; i < scope->symbolCount(); ++i) {
addCompletionItem(scope->symbolAt(i));
}
}
return m_startPosition;
}
bool CppCodeCompletion::completeConstructorOrFunction(const QList<LookupItem> &results,
const LookupContext &context,
int endOfExpression, bool toolTipOnly)
{
QList<Function *> functions;
foreach (const LookupItem &result, results) {
FullySpecifiedType exprTy = result.type().simplified();
if (Class *klass = exprTy->asClassType()) {
const Name *className = klass->name();
if (! className)
continue; // nothing to do for anonymoous classes.
for (unsigned i = 0; i < klass->memberCount(); ++i) {
Symbol *member = klass->memberAt(i);
const Name *memberName = member->name();
if (! memberName)
continue; // skip anonymous member.
else if (memberName->isQualifiedNameId())
continue; // skip
if (Function *funTy = member->type()->asFunctionType()) {
if (memberName->isEqualTo(className)) {
// it's a ctor.
functions.append(funTy);
}
}
}
break;
}
}
if (functions.isEmpty()) {
foreach (const LookupItem &result, results) {
FullySpecifiedType ty = result.type().simplified();
if (Function *fun = ty->asFunctionType()) {
if (! fun->name())
continue;
else if (! functions.isEmpty() && functions.first()->scope() != fun->scope())
continue; // skip fun, it's an hidden declaration.
bool newOverload = true;
foreach (Function *f, functions) {
if (fun->isEqualTo(f)) {
newOverload = false;
break;
}
}
if (newOverload)
functions.append(fun);
}
}
}
if (functions.isEmpty()) {
ResolveExpression resolveExpression(context);
ResolveClass resolveClass;
const Name *functionCallOp = context.control()->operatorNameId(OperatorNameId::FunctionCallOp);
foreach (const LookupItem &result, results) {
FullySpecifiedType ty = result.type().simplified();
if (NamedType *namedTy = ty->asNamedType()) {
const QList<Symbol *> classObjectCandidates = resolveClass(namedTy->name(), result, context);
foreach (Symbol *classObjectCandidate, classObjectCandidates) {
if (Class *klass = classObjectCandidate->asClass()) {
const QList<LookupItem> overloads =
resolveExpression.resolveMember(functionCallOp, klass,
namedTy->name());
foreach (const LookupItem &overloadResult, overloads) {
FullySpecifiedType overloadTy = overloadResult.type().simplified();
if (Function *funTy = overloadTy->asFunctionType())
functions.append(funTy);
}
}
}
}
}
}
// There are two different kinds of completion we want to provide:
// 1. If this is a function call, we want to pop up a tooltip that shows the user
// the possible overloads with their argument types and names.
// 2. If this is a function definition, we want to offer autocompletion of
// the function signature.
// check if function signature autocompletion is appropriate
if (! functions.isEmpty() && ! toolTipOnly) {
// function definitions will only happen in class or namespace scope,
// so get the current location's enclosing scope.
// get current line and column
TextEditor::BaseTextEditor *edit = qobject_cast<TextEditor::BaseTextEditor *>(m_editor->widget());
int lineSigned = 0, columnSigned = 0;
edit->convertPosition(m_editor->position(), &lineSigned, &columnSigned);
unsigned line = lineSigned, column = columnSigned;
// find a scope that encloses the current location, starting from the lastVisibileSymbol
// and moving outwards
Scope *sc = 0;
if (context.symbol())
sc = context.symbol()->scope();
else if (context.thisDocument())
sc = context.thisDocument()->globalSymbols();
while (sc && sc->enclosingScope()) {
unsigned startLine, startColumn;
context.thisDocument()->translationUnit()->getPosition(sc->owner()->startOffset(), &startLine, &startColumn);
unsigned endLine, endColumn;
context.thisDocument()->translationUnit()->getPosition(sc->owner()->endOffset(), &endLine, &endColumn);
if (startLine <= line && line <= endLine) {
if ((startLine != line || startColumn <= column)
&& (endLine != line || column <= endColumn))
break;
}
sc = sc->enclosingScope();
}
if (sc && (sc->isClassScope() || sc->isNamespaceScope())) {
// It may still be a function call. If the whole line parses as a function
// declaration, we should be certain that it isn't.
bool autocompleteSignature = false;
QTextCursor tc(edit->document());
tc.setPosition(endOfExpression);
BackwardsScanner bs(tc);
QString possibleDecl = bs.mid(bs.startOfLine(bs.startToken())).trimmed().append("();");
Document::Ptr doc = Document::create(QLatin1String("<completion>"));
doc->setSource(possibleDecl.toLatin1());
if (doc->parse(Document::ParseDeclaration)) {
doc->check();
if (SimpleDeclarationAST *sd = doc->translationUnit()->ast()->asSimpleDeclaration()) {
if (sd->declarator_list &&
sd->declarator_list && sd->declarator_list->value->postfix_declarator_list
&& sd->declarator_list->value->postfix_declarator_list->value->asFunctionDeclarator()) {
autocompleteSignature = true;
}
}
}
if (autocompleteSignature) {
// set up signature autocompletion
foreach (Function *f, functions) {
Overview overview;
overview.setShowArgumentNames(true);
// gets: "parameter list) cv-spec",
QString completion = overview(f->type()).mid(1);
TextEditor::CompletionItem item(this);
item.text = completion;
item.data = QVariant::fromValue(CompleteFunctionDeclaration(f));
m_completions.append(item);
}
return true;
}
}
}
if (! functions.empty()) {
// set up function call tooltip
// Recreate if necessary
if (!m_functionArgumentWidget)
m_functionArgumentWidget = new FunctionArgumentWidget;
m_functionArgumentWidget->showFunctionHint(functions,
typeOfExpression.lookupContext(),
m_startPosition);
}
return false;
}
bool CppCodeCompletion::completeMember(const QList<LookupItem> &baseResults,
const LookupContext &context)
{
if (baseResults.isEmpty())
return false;
ResolveExpression resolveExpression(context);
ResolveClass resolveClass;
bool replacedDotOperator = false;
const QList<LookupItem> classObjectResults =
resolveExpression.resolveBaseExpression(baseResults,
m_completionOperator,
&replacedDotOperator);
QList<Symbol *> classObjectCandidates;
foreach (const LookupItem &r, classObjectResults) {
FullySpecifiedType ty = r.type().simplified();
if (Class *klass = ty->asClassType())
classObjectCandidates.append(klass);
else if (NamedType *namedTy = ty->asNamedType()) {
const Name *className = namedTy->name();
const QList<Symbol *> classes = resolveClass(className, r, context);
foreach (Symbol *c, classes) {
if (Class *klass = c->asClass())
classObjectCandidates.append(klass);
}
}
}
if (replacedDotOperator && ! classObjectCandidates.isEmpty()) {
// Replace . with ->
int length = m_editor->position() - m_startPosition + 1;
m_editor->setCurPos(m_startPosition - 1);
m_editor->replace(length, QLatin1String("->"));
++m_startPosition;
}
completeClass(classObjectCandidates, context, /*static lookup = */ false);
if (! m_completions.isEmpty())
return true;
return false;
}
bool CppCodeCompletion::completeScope(const QList<LookupItem> &results,
const LookupContext &context)
{
QList<Symbol *> classes, namespaces;
foreach (const LookupItem &result, results) {
FullySpecifiedType ty = result.type();
if (Class *classTy = ty->asClassType())
classes.append(classTy);
else if (Namespace *namespaceTy = ty->asNamespaceType())
namespaces.append(namespaceTy);
}
if (! classes.isEmpty())
completeClass(classes, context);
else if (! namespaces.isEmpty() && m_completions.isEmpty())
completeNamespace(namespaces, context);
return ! m_completions.isEmpty();
}
void CppCodeCompletion::addKeywords()
{
int keywordLimit = T_FIRST_OBJC_AT_KEYWORD;
if (objcKeywordsWanted())
keywordLimit = T_LAST_OBJC_AT_KEYWORD + 1;
// keyword completion items.
for (int i = T_FIRST_KEYWORD; i < keywordLimit; ++i) {
TextEditor::CompletionItem item(this);
item.text = QLatin1String(Token::name(i));
item.icon = m_icons.keywordIcon();
m_completions.append(item);
}
}
void CppCodeCompletion::addMacros(const QString &fileName, const Snapshot &snapshot)
{
QSet<QString> processed;
QSet<QString> definedMacros;
addMacros_helper(snapshot, fileName, &processed, &definedMacros);
foreach (const QString &macroName, definedMacros) {
TextEditor::CompletionItem item(this);
item.text = macroName;
item.icon = m_icons.macroIcon();
m_completions.append(item);
}
}
void CppCodeCompletion::addMacros_helper(const Snapshot &snapshot,
const QString &fileName,
QSet<QString> *processed,
QSet<QString> *definedMacros)
{
Document::Ptr doc = snapshot.document(fileName);
if (! doc || processed->contains(doc->fileName()))
return;
processed->insert(doc->fileName());
foreach (const Document::Include &i, doc->includes()) {
addMacros_helper(snapshot, i.fileName(), processed, definedMacros);
}
foreach (const Macro &macro, doc->definedMacros()) {
const QString macroName = QString::fromUtf8(macro.name().constData(), macro.name().length());
if (! macro.isHidden())
definedMacros->insert(macroName);
else
definedMacros->remove(macroName);
}
}
void CppCodeCompletion::addCompletionItem(Symbol *symbol)
{
ConvertToCompletionItem toCompletionItem(this);
if (TextEditor::CompletionItem item = toCompletionItem(symbol))
m_completions.append(item);
}
bool CppCodeCompletion::completeInclude(const QTextCursor &cursor)
{
QString directoryPrefix;
if (m_completionOperator == T_SLASH) {
QTextCursor c = cursor;
c.movePosition(QTextCursor::StartOfLine, QTextCursor::KeepAnchor);
QString sel = c.selectedText();
int startCharPos = sel.indexOf(QLatin1Char('"'));
if (startCharPos == -1) {
startCharPos = sel.indexOf(QLatin1Char('<'));
m_completionOperator = T_ANGLE_STRING_LITERAL;
} else {
m_completionOperator = T_STRING_LITERAL;
}
if (startCharPos != -1)
directoryPrefix = sel.mid(startCharPos + 1, sel.length() - 1);
}
// Make completion for all relevant includes
if (ProjectExplorer::Project *project = ProjectExplorer::ProjectExplorerPlugin::instance()->currentProject()) {
QStringList includePaths = m_manager->projectInfo(project).includePaths;
const QString currentFilePath = QFileInfo(m_editor->file()->fileName()).path();
if (!includePaths.contains(currentFilePath))
includePaths.append(currentFilePath);
foreach (const QString &includePath, includePaths) {
QString realPath = includePath;
if (!directoryPrefix.isEmpty()) {
realPath += QLatin1Char('/');
realPath += directoryPrefix;
}
foreach (const QString &itemText, m_manager->includesInPath(realPath)) {
TextEditor::CompletionItem item(this);
item.text += itemText;
// TODO: Icon for include files
item.icon = m_icons.keywordIcon();
m_completions.append(item);
}
}
QStringList frameworkPaths = m_manager->projectInfo(project).frameworkPaths;
foreach (const QString &frameworkPath, frameworkPaths) {
QString realPath = frameworkPath;
if (!directoryPrefix.isEmpty()) {
realPath += QLatin1Char('/');
realPath += directoryPrefix;
realPath += QLatin1String(".framework/Headers");
}
foreach (const QString &itemText, m_manager->includesInPath(realPath)) {
TextEditor::CompletionItem item(this);
item.text += itemText;
// TODO: Icon for include files
item.icon = m_icons.keywordIcon();
m_completions.append(item);
}
}
}
return !m_completions.isEmpty();
}
void CppCodeCompletion::completeNamespace(const QList<Symbol *> &candidates,
const LookupContext &context)
{
QList<Scope *> todo;
QList<Scope *> visibleScopes = context.visibleScopes();
foreach (Symbol *candidate, candidates) {
if (Namespace *ns = candidate->asNamespace())
context.expand(ns->members(), visibleScopes, &todo);
}
foreach (Scope *scope, todo) {
if (! (scope->isNamespaceScope() || scope->isEnumScope()))
continue;
addCompletionItem(scope->owner());
for (unsigned i = 0; i < scope->symbolCount(); ++i) {
addCompletionItem(scope->symbolAt(i));
}
}
}
void CppCodeCompletion::completeClass(const QList<Symbol *> &candidates,
const LookupContext &context,
bool staticLookup)
{
if (candidates.isEmpty())
return;
Class *klass = candidates.first()->asClass();
QList<Scope *> todo;
context.expand(klass->members(), context.visibleScopes(), &todo);
foreach (Scope *scope, todo) {
if (! (scope->isClassScope() || scope->isEnumScope()))
continue;
addCompletionItem(scope->owner());
for (unsigned i = 0; i < scope->symbolCount(); ++i) {
Symbol *symbol = scope->symbolAt(i);
if (symbol->type().isFriend())
continue;
else if (! staticLookup && (symbol->isTypedef() ||
symbol->isEnum() ||
symbol->isClass()))
continue;
addCompletionItem(symbol);
}
}
}
bool CppCodeCompletion::completeQtMethod(const QList<LookupItem> &results,
const LookupContext &context,
bool wantSignals)
{
if (results.isEmpty())
return false;
ResolveClass resolveClass;
ConvertToCompletionItem toCompletionItem(this);
Overview o;
o.setShowReturnTypes(false);
o.setShowArgumentNames(false);
o.setShowFunctionSignatures(true);
QSet<QString> signatures;
foreach (const LookupItem &p, results) {
FullySpecifiedType ty = p.type().simplified();
if (PointerType *ptrTy = ty->asPointerType())
ty = ptrTy->elementType().simplified();
else
continue; // not a pointer or a reference to a pointer.
NamedType *namedTy = ty->asNamedType();
if (! namedTy) // not a class name.
continue;
const QList<Symbol *> classObjects =
resolveClass(namedTy->name(), p, context);
if (classObjects.isEmpty())
continue;
Class *klass = classObjects.first()->asClass();
QList<Scope *> todo;
const QList<Scope *> visibleScopes = context.visibleScopes(p);
context.expand(klass->members(), visibleScopes, &todo);
foreach (Scope *scope, todo) {
if (! scope->isClassScope())
continue;
for (unsigned i = 0; i < scope->symbolCount(); ++i) {
Symbol *member = scope->symbolAt(i);
Function *fun = member->type()->asFunctionType();
if (! fun)
continue;
if (wantSignals && ! fun->isSignal())
continue;
else if (! wantSignals && ! fun->isSlot())
continue;
if (TextEditor::CompletionItem item = toCompletionItem(fun)) {
unsigned count = fun->argumentCount();
while (true) {
TextEditor::CompletionItem ci = item;
QString signature;
signature += overview.prettyName(fun->name());
signature += QLatin1Char('(');
for (unsigned i = 0; i < count; ++i) {
Symbol *arg = fun->argumentAt(i);
if (i != 0)
signature += QLatin1Char(',');
signature += o.prettyType(arg->type());
}
signature += QLatin1Char(')');
const QByteArray normalized =
QMetaObject::normalizedSignature(signature.toLatin1());
signature = QString::fromLatin1(normalized, normalized.size());
if (! signatures.contains(signature)) {
signatures.insert(signature);
ci.text = signature; // fix the completion item.
m_completions.append(ci);
}
if (count && fun->argumentAt(count - 1)->asArgument()->hasInitializer())
--count;
else
break;
}
}
}
}
}
return ! m_completions.isEmpty();
}
void CppCodeCompletion::completions(QList<TextEditor::CompletionItem> *completions)
{
const int length = m_editor->position() - m_startPosition;
const QString key = m_editor->textAt(m_startPosition, length);
if (length == 0)
*completions = m_completions;
else if (length > 0) {
/* Close on the trailing slash for include completion, to enable the slash to
* trigger a new completion list. */
if ((m_completionOperator == T_STRING_LITERAL ||
m_completionOperator == T_ANGLE_STRING_LITERAL) && key.endsWith(QLatin1Char('/')))
return;
if (m_completionOperator != T_LPAREN) {
filter(m_completions, completions, key, m_caseSensitivity);
} else if (m_completionOperator == T_LPAREN ||
m_completionOperator == T_SIGNAL ||
m_completionOperator == T_SLOT) {
foreach (const TextEditor::CompletionItem &item, m_completions) {
if (item.text.startsWith(key, Qt::CaseInsensitive)) {
completions->append(item);
}
}
}
}
}
QList<TextEditor::CompletionItem> CppCodeCompletion::getCompletions()
{
QList<TextEditor::CompletionItem> completionItems;
completions(&completionItems);
qStableSort(completionItems.begin(), completionItems.end(), completionItemLessThan);
// Remove duplicates
QString lastKey;
QList<TextEditor::CompletionItem> uniquelist;
foreach (const TextEditor::CompletionItem &item, completionItems) {
if (item.text != lastKey) {
uniquelist.append(item);
lastKey = item.text;
} else {
TextEditor::CompletionItem &lastItem = uniquelist.last();
Symbol *symbol = qvariant_cast<Symbol *>(item.data);
Symbol *lastSymbol = qvariant_cast<Symbol *>(lastItem.data);
if (symbol && lastSymbol) {
Function *funTy = symbol->type()->asFunctionType();
Function *lastFunTy = lastSymbol->type()->asFunctionType();
if (funTy && lastFunTy) {
if (funTy->argumentCount() == lastFunTy->argumentCount())
continue;
}
}
++lastItem.duplicateCount;
}
}
return uniquelist;
}
void CppCodeCompletion::complete(const TextEditor::CompletionItem &item)
{
Symbol *symbol = 0;
if (item.data.isValid())
symbol = item.data.value<Symbol *>();
QString toInsert;
QString extraChars;
int extraLength = 0;
int cursorOffset = 0;
bool autoParenthesesEnabled = true;
if (m_completionOperator == T_SIGNAL || m_completionOperator == T_SLOT) {
toInsert = item.text;
extraChars += QLatin1Char(')');
} else if (m_completionOperator == T_STRING_LITERAL || m_completionOperator == T_ANGLE_STRING_LITERAL) {
toInsert = item.text;
if (!toInsert.endsWith(QLatin1Char('/')))
extraChars += QLatin1Char((m_completionOperator == T_ANGLE_STRING_LITERAL) ? '>' : '"');
} else {
toInsert = item.text;
//qDebug() << "current symbol:" << overview.prettyName(symbol->name())
//<< overview.prettyType(symbol->type());
if (m_autoInsertBrackets && symbol && symbol->type()) {
if (Function *function = symbol->type()->asFunctionType()) {
// If the member is a function, automatically place the opening parenthesis,
// except when it might take template parameters.
if (! function->hasReturnType() && (function->identity() && !function->identity()->isDestructorNameId())) {
// Don't insert any magic, since the user might have just wanted to select the class
} else if (function->templateParameterCount() != 0) {
// If there are no arguments, then we need the template specification
if (function->argumentCount() == 0) {
extraChars += QLatin1Char('<');
}
} else if (! function->isAmbiguous()) {
extraChars += QLatin1Char('(');
// If the function doesn't return anything, automatically place the semicolon,
// unless we're doing a scope completion (then it might be function definition).
bool endWithSemicolon = function->returnType()->isVoidType() && m_completionOperator != T_COLON_COLON;
// If the function takes no arguments, automatically place the closing parenthesis
if (item.duplicateCount == 0 && ! function->hasArguments()) {
extraChars += QLatin1Char(')');
if (endWithSemicolon)
extraChars += QLatin1Char(';');
} else if (autoParenthesesEnabled) {
const QChar lookAhead = m_editor->characterAt(m_editor->position() + 1);
if (MatchingText::shouldInsertMatchingText(lookAhead)) {
extraChars += QLatin1Char(')');
--cursorOffset;
if (endWithSemicolon) {
extraChars += QLatin1Char(';');
--cursorOffset;
}
}
}
}
}
}
if (m_autoInsertBrackets && item.data.canConvert<CompleteFunctionDeclaration>()) {
// everything from the closing parenthesis on are extra chars, to
// make sure an auto-inserted ")" gets replaced by ") const" if necessary
int closingParen = toInsert.lastIndexOf(QLatin1Char(')'));
extraChars = toInsert.mid(closingParen);
toInsert.truncate(closingParen);
}
}
// Avoid inserting characters that are already there
for (int i = 0; i < extraChars.length(); ++i) {
const QChar a = extraChars.at(i);
const QChar b = m_editor->characterAt(m_editor->position() + i);
if (a == b)
++extraLength;
else
break;
}
toInsert += extraChars;
// Insert the remainder of the name
int length = m_editor->position() - m_startPosition + extraLength;
m_editor->setCurPos(m_startPosition);
m_editor->replace(length, toInsert);
if (cursorOffset)
m_editor->setCurPos(m_editor->position() + cursorOffset);
}
bool CppCodeCompletion::partiallyComplete(const QList<TextEditor::CompletionItem> &completionItems)
{
if (m_completionOperator == T_SIGNAL || m_completionOperator == T_SLOT) {
return false;
} else if (completionItems.count() == 1) {
complete(completionItems.first());
return true;
} else if (m_partialCompletionEnabled && m_completionOperator != T_LPAREN) {
return TextEditor::ICompletionCollector::partiallyComplete(completionItems);
}
return false;
}
void CppCodeCompletion::cleanup()
{
m_completions.clear();
// Set empty map in order to avoid referencing old versions of the documents
// until the next completion
typeOfExpression.setSnapshot(Snapshot());
}
int CppCodeCompletion::findStartOfName(int pos) const
{
if (pos == -1)
pos = m_editor->position();
QChar chr;
// Skip to the start of a name
do {
chr = m_editor->characterAt(--pos);
} while (chr.isLetterOrNumber() || chr == QLatin1Char('_'));
return pos + 1;
}
bool CppCodeCompletion::objcKeywordsWanted() const
{
if (!m_objcEnabled)
return false;
Core::IFile *file = m_editor->file();
QString fileName = file->fileName();
const Core::MimeDatabase *mdb = Core::ICore::instance()->mimeDatabase();
return mdb->findByFile(fileName).type() == CppTools::Constants::OBJECTIVE_CPP_SOURCE_MIMETYPE;
}
#include "cppcodecompletion.moc"
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