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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
#include "clangcompletioncontextanalyzer.h"
#include "clangactivationsequencecontextprocessor.h"
#include "clangactivationsequenceprocessor.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>
#include <QTextDocument>
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(
QTextDocument *document, int position, bool isFunctionHint,
CPlusPlus::LanguageFeatures languageFeatures)
: m_document(document), m_position(position), m_isFunctionHint(isFunctionHint),
m_languageFeatures(languageFeatures)
{
}
void ClangCompletionContextAnalyzer::analyze()
{
QTC_ASSERT(m_document, return);
setActionAndClangPosition(PassThroughToLibClang, -1);
ActivationSequenceContextProcessor activationSequenceContextProcessor(
m_document, m_position, m_languageFeatures);
m_completionOperator = activationSequenceContextProcessor.completionKind();
int afterOperatorPosition = activationSequenceContextProcessor.startOfNamePosition();
m_positionEndOfExpression = activationSequenceContextProcessor.operatorStartPosition();
m_positionForProposal = activationSequenceContextProcessor.startOfNamePosition();
const bool actionIsSet = !m_isFunctionHint && handleNonFunctionCall(afterOperatorPosition);
if (!actionIsSet) {
handleCommaInFunctionCall();
handleFunctionCall(afterOperatorPosition);
}
}
int ClangCompletionContextAnalyzer::startOfFunctionCall(int endOfOperator) const
{
int index = ActivationSequenceContextProcessor::skipPrecedingWhitespace(m_document,
endOfOperator);
QTextCursor textCursor(m_document);
textCursor.setPosition(index);
ExpressionUnderCursor euc(m_languageFeatures);
index = euc.startOfFunctionCall(textCursor);
index = ActivationSequenceContextProcessor::skipPrecedingWhitespace(m_document, index);
const int functionNameStart = ActivationSequenceContextProcessor::findStartOfName(
m_document, index, ActivationSequenceContextProcessor::NameCategory::Function);
if (functionNameStart == -1)
return -1;
QTextCursor functionNameSelector(m_document);
functionNameSelector.setPosition(functionNameStart);
functionNameSelector.setPosition(index, QTextCursor::KeepAnchor);
const QString functionName = functionNameSelector.selectedText().trimmed();
if (functionName.isEmpty() && m_completionOperator == T_LBRACE)
return endOfOperator;
return functionName.isEmpty() ? -1 : functionNameStart;
}
void ClangCompletionContextAnalyzer::setActionAndClangPosition(CompletionAction action,
int position,
int functionNameStart)
{
QTC_CHECK(position >= -1);
m_completionAction = action;
m_positionForClang = position;
m_functionNameStart = functionNameStart;
}
void
ClangCompletionContextAnalyzer::setAction(ClangCompletionContextAnalyzer::CompletionAction action)
{
setActionAndClangPosition(action, -1);
}
void ClangCompletionContextAnalyzer::handleCommaInFunctionCall()
{
if (m_completionOperator == T_COMMA) {
ExpressionUnderCursor expressionUnderCursor(m_languageFeatures);
QTextCursor textCursor(m_document);
textCursor.setPosition(m_positionEndOfExpression);
const int start = expressionUnderCursor.startOfFunctionCall(textCursor);
m_positionEndOfExpression = start;
m_positionForProposal = start + 1; // After '(' of function call
if (m_document->characterAt(start) == '(')
m_completionOperator = T_LPAREN;
else
m_completionOperator = T_LBRACE;
}
}
void ClangCompletionContextAnalyzer::handleFunctionCall(int afterOperatorPosition)
{
if (m_isFunctionHint) {
const int functionNameStart = startOfFunctionCall(afterOperatorPosition);
if (functionNameStart >= 0) {
m_addSnippets = functionNameStart == afterOperatorPosition;
setActionAndClangPosition(PassThroughToLibClangAfterLeftParen,
m_positionForProposal,
functionNameStart);
} else {
m_completionAction = CompleteNone;
}
return;
}
if (m_completionOperator == T_LPAREN || m_completionOperator == T_LBRACE) {
ExpressionUnderCursor expressionUnderCursor(m_languageFeatures);
QTextCursor textCursor(m_document);
textCursor.setPosition(m_positionEndOfExpression);
const QString expression = expressionUnderCursor(textCursor);
const QString trimmedExpression = expression.trimmed();
const QChar lastExprChar = trimmedExpression.isEmpty()
? QChar() : trimmedExpression.at(trimmedExpression.length() - 1);
const bool mightBeConstructorCall = lastExprChar != ')';
if (expression.endsWith(QLatin1String("SIGNAL"))) {
setActionAndClangPosition(CompleteSignal, afterOperatorPosition);
} else if (expression.endsWith(QLatin1String("SLOT"))) {
setActionAndClangPosition(CompleteSlot, afterOperatorPosition);
} else if (m_position != afterOperatorPosition
|| (m_completionOperator == T_LBRACE && !mightBeConstructorCall)) {
// No function completion if cursor is not after '(' or ','
m_addSnippets = true;
m_positionForProposal = afterOperatorPosition;
setActionAndClangPosition(PassThroughToLibClang, afterOperatorPosition);
} else {
const int functionNameStart = startOfFunctionCall(afterOperatorPosition);
if (functionNameStart >= 0) {
m_addSnippets = functionNameStart == afterOperatorPosition;
setActionAndClangPosition(PassThroughToLibClangAfterLeftParen,
afterOperatorPosition,
functionNameStart);
} else { // e.g. "(" without any function name in front
m_addSnippets = true;
m_positionForProposal = afterOperatorPosition;
setActionAndClangPosition(PassThroughToLibClang, afterOperatorPosition);
}
}
}
}
bool ClangCompletionContextAnalyzer::handleNonFunctionCall(int position)
{
if (isTokenForPassThrough(m_completionOperator)) {
if (m_completionOperator == T_EOF_SYMBOL)
m_addSnippets = true;
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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