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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing
**
** 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 The Qt Company. For licensing terms and
** conditions see http://www.qt.io/terms-conditions. For further information
** use the contact form at http://www.qt.io/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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
****************************************************************************/
#include "clangcompletioncontextanalyzer.h"
#include "activationsequenceprocessor.h"
#include "activationsequencecontextprocessor.h"
#include <texteditor/codeassist/assistinterface.h>
#include <cplusplus/BackwardsScanner.h>
#include <cplusplus/ExpressionUnderCursor.h>
#include <cplusplus/SimpleLexer.h>
#include <utils/qtcassert.h>
#include <QDebug>
#include <QTextBlock>
#include <QTextCursor>
using namespace CPlusPlus;
namespace {
bool isTokenForIncludePathCompletion(unsigned tokenKind)
{
return tokenKind == T_STRING_LITERAL
|| tokenKind == T_ANGLE_STRING_LITERAL
|| tokenKind == T_SLASH;
}
bool isTokenForPassThrough(unsigned tokenKind)
{
return tokenKind == T_EOF_SYMBOL
|| tokenKind == T_DOT
|| tokenKind == T_COLON_COLON
|| tokenKind == T_ARROW
|| tokenKind == T_DOT_STAR;
}
} // anonymous namespace
namespace ClangCodeModel {
namespace Internal {
ClangCompletionContextAnalyzer::ClangCompletionContextAnalyzer(
const ClangCompletionAssistInterface *assistInterface,
CPlusPlus::LanguageFeatures languageFeatures)
: m_interface(assistInterface)
, m_languageFeatures(languageFeatures)
{
}
void ClangCompletionContextAnalyzer::analyze()
{
QTC_ASSERT(m_interface, return);
setActionAndClangPosition(PassThroughToLibClang, -1);
ActivationSequenceContextProcessor activationSequenceContextProcessor(m_interface);
m_completionOperator = activationSequenceContextProcessor.completionKind();
int afterOperatorPosition = activationSequenceContextProcessor.positionAfterOperator();
m_positionEndOfExpression = activationSequenceContextProcessor.positionBeforeOperator();
m_positionForProposal = activationSequenceContextProcessor.positionAfterOperator();
const bool actionIsSet = handleNonFunctionCall(afterOperatorPosition);
if (!actionIsSet) {
handleCommaInFunctionCall();
handleFunctionCall(afterOperatorPosition);
}
}
ClangCompletionContextAnalyzer::FunctionInfo ClangCompletionContextAnalyzer::analyzeFunctionCall(
int endOfOperator) const
{
int index = skipPrecedingWhitespace(endOfOperator);
QTextCursor textCursor(m_interface->textDocument());
textCursor.setPosition(index);
ExpressionUnderCursor euc(m_languageFeatures);
index = euc.startOfFunctionCall(textCursor);
const int functionNameStart = findStartOfName(index);
QTextCursor textCursor2(m_interface->textDocument());
textCursor2.setPosition(functionNameStart);
textCursor2.setPosition(index, QTextCursor::KeepAnchor);
FunctionInfo info;
info.functionNamePosition = functionNameStart;
info.functionName = textCursor2.selectedText().trimmed();
return info;
}
int ClangCompletionContextAnalyzer::findStartOfName(int position) const
{
if (position == -1)
position = m_interface->position();
QChar chr;
do {
chr = m_interface->characterAt(--position);
// TODO: Check also chr.isHighSurrogate() / ch.isLowSurrogate()?
// See also CppTools::isValidFirstIdentifierChar
} while (chr.isLetterOrNumber() || chr == QLatin1Char('_'));
return position + 1;
}
int ClangCompletionContextAnalyzer::skipPrecedingWhitespace(int position) const
{
QTC_ASSERT(position >= 0, return position);
while (m_interface->characterAt(position - 1).isSpace())
--position;
return position;
}
void ClangCompletionContextAnalyzer::setActionAndClangPosition(CompletionAction action,
int position)
{
QTC_CHECK(position >= -1);
m_completionAction = action;
m_positionForClang = position;
}
void ClangCompletionContextAnalyzer::setAction(ClangCompletionContextAnalyzer::CompletionAction action)
{
setActionAndClangPosition(action, -1);
}
void ClangCompletionContextAnalyzer::handleCommaInFunctionCall()
{
if (m_completionOperator == T_COMMA) {
ExpressionUnderCursor expressionUnderCursor(m_languageFeatures);
QTextCursor textCursor(m_interface->textDocument());
textCursor.setPosition(m_positionEndOfExpression);
const int start = expressionUnderCursor.startOfFunctionCall(textCursor);
m_positionEndOfExpression = start;
m_positionForProposal = start + 1; // After '(' of function call
m_completionOperator = T_LPAREN;
}
}
void ClangCompletionContextAnalyzer::handleFunctionCall(int afterOperatorPosition)
{
if (m_completionOperator == T_LPAREN) {
ExpressionUnderCursor expressionUnderCursor(m_languageFeatures);
QTextCursor textCursor(m_interface->textDocument());
textCursor.setPosition(m_positionEndOfExpression);
const QString expression = expressionUnderCursor(textCursor);
if (expression.endsWith(QLatin1String("SIGNAL"))) {
setActionAndClangPosition(CompleteSignal, afterOperatorPosition);
} else if (expression.endsWith(QLatin1String("SLOT"))) {
setActionAndClangPosition(CompleteSlot, afterOperatorPosition);
} else if (m_interface->position() != afterOperatorPosition) {
// No function completion if cursor is not after '(' or ','
m_positionForProposal = afterOperatorPosition;
setActionAndClangPosition(PassThroughToLibClang, afterOperatorPosition);
} else {
const FunctionInfo functionInfo = analyzeFunctionCall(afterOperatorPosition);
m_functionName = functionInfo.functionName;
setActionAndClangPosition(PassThroughToLibClangAfterLeftParen,
functionInfo.functionNamePosition);
}
}
}
bool ClangCompletionContextAnalyzer::handleNonFunctionCall(int position)
{
if (isTokenForPassThrough(m_completionOperator)) {
setActionAndClangPosition(PassThroughToLibClang, position);
return true;
} else if (m_completionOperator == T_DOXY_COMMENT) {
setAction(CompleteDoxygenKeyword);
return true;
} else if (m_completionOperator == T_POUND) {
// TODO: Check if libclang can complete preprocessor directives
setAction(CompletePreprocessorDirective);
return true;
} else if (isTokenForIncludePathCompletion(m_completionOperator)) {
setAction(CompleteIncludePath);
return true;
}
return false;
}
} // namespace Internal
} // namespace ClangCodeModel
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