forked from qt-creator/qt-creator
Clang: Refactor ClangCompletionContextAnalyzer
Change-Id: Ib42ddc672da8b068591129e2e0b9652d3e07ad58 Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>
This commit is contained in:
Marco Bubke
committed by
Nikolai Kosjar
Nikolai Kosjar
parent
5a791e8839
commit
ae5d92d618
@@ -0,0 +1,249 @@
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/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing
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**
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** This file is part of Qt Creator.
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**
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms and
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** conditions see http://www.qt.io/terms-conditions. For further information
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** use the contact form at http://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 or version 3 as published by the Free
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** Software Foundation and appearing in the file LICENSE.LGPLv21 and
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** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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** following information to ensure the GNU Lesser General Public License
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** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, The Qt Company gives you certain additional
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** rights. These rights are described in The Qt Company LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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****************************************************************************/
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#include "activationsequencecontextprocessor.h"
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#include "activationsequenceprocessor.h"
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#include <cplusplus/BackwardsScanner.h>
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#include <cplusplus/ExpressionUnderCursor.h>
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#include <cplusplus/SimpleLexer.h>
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#include <QRegExp>
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#include <QTextDocument>
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namespace ClangCodeModel {
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namespace Internal {
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ActivationSequenceContextProcessor::ActivationSequenceContextProcessor(const ClangCompletionAssistInterface *assistInterface)
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: m_textCursor(assistInterface->textDocument()),
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m_assistInterface(assistInterface),
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m_positionInDocument(assistInterface->position()),
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m_positionAfterOperator(m_positionInDocument),
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m_positionBeforeOperator(m_positionAfterOperator)
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{
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m_textCursor.setPosition(m_positionInDocument);
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process();
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}
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CPlusPlus::Kind ActivationSequenceContextProcessor::completionKind() const
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{
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return m_completionKind;
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}
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const QTextCursor &ActivationSequenceContextProcessor::textCursor_forTestOnly() const
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{
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return m_textCursor;
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}
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int ActivationSequenceContextProcessor::positionAfterOperator() const
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{
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return m_positionAfterOperator;
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}
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int ActivationSequenceContextProcessor::positionBeforeOperator() const
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{
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return m_positionBeforeOperator;
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}
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void ActivationSequenceContextProcessor::process()
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{
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skipeWhiteSpacesAndIdentifierBeforeCursor();
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processActivationSequence();
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if (m_completionKind != CPlusPlus::T_EOF_SYMBOL) {
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processStringLiteral();
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processComma();
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generateTokens();
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processDoxygenComment();
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processComment();
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processInclude();
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processSlashOutsideOfAString();
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processLeftParen();
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processPreprocessorInclude();
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resetPositionForEOFCompletionKind();
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}
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}
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void ActivationSequenceContextProcessor::processActivationSequence()
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{
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const auto activationSequence = m_assistInterface->textAt(m_positionInDocument - 3, 3);
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ActivationSequenceProcessor activationSequenceProcessor(activationSequence,
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m_positionInDocument,
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true);
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m_completionKind = activationSequenceProcessor.completionKind();
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m_positionBeforeOperator = activationSequenceProcessor.position();
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}
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void ActivationSequenceContextProcessor::processStringLiteral()
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{
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if (m_completionKind == CPlusPlus::T_STRING_LITERAL) {
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QTextCursor selectionTextCursor = m_textCursor;
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selectionTextCursor.movePosition(QTextCursor::StartOfLine, QTextCursor::KeepAnchor);
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QString selection = selectionTextCursor.selectedText();
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if (selection.indexOf(QLatin1Char('"')) < selection.length() - 1)
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m_completionKind = CPlusPlus::T_EOF_SYMBOL;
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}
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}
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void ActivationSequenceContextProcessor::processComma()
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{
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if (m_completionKind == CPlusPlus::T_COMMA) {
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CPlusPlus::ExpressionUnderCursor expressionUnderCursor(m_assistInterface->languageFeatures());
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if (expressionUnderCursor.startOfFunctionCall(m_textCursor) == -1)
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m_completionKind = CPlusPlus::T_EOF_SYMBOL;
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}
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}
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void ActivationSequenceContextProcessor::generateTokens()
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{
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CPlusPlus::SimpleLexer tokenize;
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tokenize.setLanguageFeatures(m_assistInterface->languageFeatures());
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tokenize.setSkipComments(false);
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auto state = CPlusPlus::BackwardsScanner::previousBlockState(m_textCursor.block());
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m_tokens = tokenize(m_textCursor.block().text(), state);
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int leftOfCursorTokenIndex = std::max(0, m_textCursor.positionInBlock() - 1);
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m_tokenIndex= CPlusPlus::SimpleLexer::tokenBefore(m_tokens, leftOfCursorTokenIndex); // get the token at the left of the cursor
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if (m_tokenIndex > -1)
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m_token = m_tokens.at(m_tokenIndex);
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}
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void ActivationSequenceContextProcessor::processDoxygenComment()
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{
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if (m_completionKind == CPlusPlus::T_DOXY_COMMENT
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&& !(m_token.is(CPlusPlus::T_DOXY_COMMENT)
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|| m_token.is(CPlusPlus::T_CPP_DOXY_COMMENT)))
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m_completionKind = CPlusPlus::T_EOF_SYMBOL;
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}
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void ActivationSequenceContextProcessor::processComment()
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{
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if (m_token.is(CPlusPlus::T_COMMENT) || m_token.is(CPlusPlus::T_CPP_COMMENT))
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m_completionKind = CPlusPlus::T_EOF_SYMBOL;
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}
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void ActivationSequenceContextProcessor::processInclude()
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{
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if (m_token.isLiteral() && !isCompletionKindStringLiteralOrSlash())
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m_completionKind = CPlusPlus::T_EOF_SYMBOL;
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}
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void ActivationSequenceContextProcessor::processSlashOutsideOfAString()
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{
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if (m_completionKind ==CPlusPlus::T_SLASH
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&& (m_token.isNot(CPlusPlus::T_STRING_LITERAL)
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&& m_token.isNot(CPlusPlus::T_ANGLE_STRING_LITERAL)))
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m_completionKind = CPlusPlus::T_EOF_SYMBOL;
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}
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void ActivationSequenceContextProcessor::processLeftParen()
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{
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if (m_completionKind == CPlusPlus::T_LPAREN) {
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if (m_tokenIndex > 0) {
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// look at the token at the left of T_LPAREN
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const CPlusPlus::Token &previousToken = m_tokens.at(m_tokenIndex - 1);
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switch (previousToken.kind()) {
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case CPlusPlus::T_IDENTIFIER:
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case CPlusPlus::T_GREATER:
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case CPlusPlus::T_SIGNAL:
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case CPlusPlus::T_SLOT:
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break; // good
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default:
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// that's a bad token :)
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m_completionKind = CPlusPlus::T_EOF_SYMBOL;
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}
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}
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}
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}
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bool ActivationSequenceContextProcessor::isCompletionKindStringLiteralOrSlash() const
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{
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return m_completionKind == CPlusPlus::T_STRING_LITERAL
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|| m_completionKind == CPlusPlus::T_ANGLE_STRING_LITERAL
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|| m_completionKind == CPlusPlus::T_SLASH;
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}
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bool ActivationSequenceContextProcessor::isProbablyPreprocessorIncludeDirective() const
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{
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return m_tokens.size() >= 3
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&& m_tokens.at(0).is(CPlusPlus::T_POUND)
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&& m_tokens.at(1).is(CPlusPlus::T_IDENTIFIER)
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&& (m_tokens.at(2).is(CPlusPlus::T_STRING_LITERAL)
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|| m_tokens.at(2).is(CPlusPlus::T_ANGLE_STRING_LITERAL));
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}
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void ActivationSequenceContextProcessor::processPreprocessorInclude()
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{
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if (isCompletionKindStringLiteralOrSlash()) {
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if (isProbablyPreprocessorIncludeDirective()) {
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const CPlusPlus::Token &directiveToken = m_tokens.at(1);
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QString directive = m_textCursor.block().text().mid(directiveToken.bytesBegin(),
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directiveToken.bytes());
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if (directive != QStringLiteral("include")
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&& directive != QStringLiteral("include_next")
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&& directive != QStringLiteral("import"))
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m_completionKind = CPlusPlus::T_EOF_SYMBOL;
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} else {
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m_completionKind = CPlusPlus::T_EOF_SYMBOL;
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}
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}
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}
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void ActivationSequenceContextProcessor::resetPositionForEOFCompletionKind()
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{
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if (m_completionKind == CPlusPlus::T_EOF_SYMBOL)
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m_positionBeforeOperator = m_positionInDocument;
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}
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void ActivationSequenceContextProcessor::skipeWhiteSpacesAndIdentifierBeforeCursor()
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{
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QTextDocument *document = m_assistInterface->textDocument();
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const QRegExp findNonWhiteSpaceRegularExpression(QStringLiteral("[^\\s\\w]"));
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auto nonWhiteSpaceTextCursor = document->find(findNonWhiteSpaceRegularExpression,
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m_positionInDocument,
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QTextDocument::FindBackward);
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if (!nonWhiteSpaceTextCursor.isNull()) {
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m_positionInDocument = nonWhiteSpaceTextCursor.position();
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m_positionAfterOperator = m_positionInDocument;
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m_textCursor.setPosition(m_positionInDocument);
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}
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}
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} // namespace Internal
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} // namespace ClangCodeModel
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