cppautocompleter.cpp 4.38 KB
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/**************************************************************************
**
** This file is part of Qt Creator
**
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** Copyright (c) 2012 Nokia Corporation and/or its subsidiary(-ies).
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**
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
**
** GNU Lesser General Public License Usage
**
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** 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.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
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** Other Usage
**
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
**************************************************************************/

#include "cppautocompleter.h"

#include <Token.h>

#include <cplusplus/SimpleLexer.h>
#include <cplusplus/MatchingText.h>
#include <cplusplus/BackwardsScanner.h>

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#include <QLatin1Char>
#include <QTextCursor>
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using namespace CppEditor;
using namespace Internal;
using namespace CPlusPlus;

CppAutoCompleter::CppAutoCompleter()
{}

CppAutoCompleter::~CppAutoCompleter()
{}

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bool CppAutoCompleter::contextAllowsAutoParentheses(const QTextCursor &cursor,
                                                    const QString &textToInsert) const
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{
    QChar ch;

    if (! textToInsert.isEmpty())
        ch = textToInsert.at(0);

    if (! (MatchingText::shouldInsertMatchingText(cursor)
           || ch == QLatin1Char('\'')
           || ch == QLatin1Char('"')))
        return false;
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    else if (isInCommentHelper(cursor))
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        return false;

    return true;
}

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bool CppAutoCompleter::contextAllowsElectricCharacters(const QTextCursor &cursor) const
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{
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    Token token;
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    if (isInCommentHelper(cursor, &token))
        return false;
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    if (token.is(T_STRING_LITERAL) || token.is(T_WIDE_STRING_LITERAL)
            || token.is(T_CHAR_LITERAL) || token.is(T_WIDE_CHAR_LITERAL)) {
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        const unsigned pos = cursor.selectionEnd() - cursor.block().position();
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        if (pos <= token.end())
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            return false;
    }

    return true;
}

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bool CppAutoCompleter::isInComment(const QTextCursor &cursor) const
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{
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    return isInCommentHelper(cursor);
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}

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QString CppAutoCompleter::insertMatchingBrace(const QTextCursor &cursor,
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                                                const QString &text,
                                                QChar la,
                                                int *skippedChars) const
{
    MatchingText m;
    return m.insertMatchingBrace(cursor, text, la, skippedChars);
}

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QString CppAutoCompleter::insertParagraphSeparator(const QTextCursor &cursor) const
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{
    MatchingText m;
    return m.insertParagraphSeparator(cursor);
}
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bool CppAutoCompleter::isInCommentHelper(const QTextCursor &cursor, Token *retToken) const
{
    SimpleLexer tokenize;
    tokenize.setQtMocRunEnabled(false);
    tokenize.setObjCEnabled(false);
    tokenize.setCxx0xEnabled(true);

    const int prevState = BackwardsScanner::previousBlockState(cursor.block()) & 0xFF;
    const QList<Token> tokens = tokenize(cursor.block().text(), prevState);

    const unsigned pos = cursor.selectionEnd() - cursor.block().position();

    if (tokens.isEmpty() || pos < tokens.first().begin())
        return prevState > 0;

    if (pos >= tokens.last().end()) {
        const Token tk = tokens.last();
        if (tk.is(T_CPP_COMMENT) || tk.is(T_CPP_DOXY_COMMENT))
            return true;
        return tk.isComment() && (cursor.block().userState() & 0xFF);
    }

    Token tk = tokenAtPosition(tokens, pos);

    if (retToken)
        *retToken = tk;

    return tk.isComment();
}

const Token CppAutoCompleter::tokenAtPosition(const QList<Token> &tokens, const unsigned pos) const
{
    for (int i = tokens.size() - 1; i >= 0; --i) {
        const Token tk = tokens.at(i);
        if (pos >= tk.begin() && pos < tk.end())
            return tk;
    }
    return Token();
}