cppautocompleter.cpp 5.6 KB
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/****************************************************************************
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**
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** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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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
** 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 Digia.  For licensing terms and
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** conditions see http://www.qt.io/licensing.  For further information
** use the contact form at http://www.qt.io/contact-us.
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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
** 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
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
** In addition, as a special exception, Digia gives you certain additional
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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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#include "cppautocompleter.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;

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static const Token tokenAtPosition(const QList<Token> &tokens, const unsigned pos)
{
    for (int i = tokens.size() - 1; i >= 0; --i) {
        const Token tk = tokens.at(i);
        if (pos >= tk.utf16charsBegin() && pos < tk.utf16charsEnd())
            return tk;
    }
    return Token();
}

static bool isInCommentHelper(const QTextCursor &cursor, Token *retToken = 0)
{
    LanguageFeatures features;
    features.qtEnabled = false;
    features.qtKeywordsEnabled = false;
    features.qtMocRunEnabled = false;
    features.cxx11Enabled = true;
    features.c99Enabled = true;

    SimpleLexer tokenize;
    tokenize.setLanguageFeatures(features);

    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();
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    if (tokens.isEmpty() || pos < tokens.first().utf16charsBegin())
        return prevState > 0;

    if (pos >= tokens.last().utf16charsEnd()) {
        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();
}
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static bool isInStringHelper(const QTextCursor &cursor, Token *retToken = 0)
{
    LanguageFeatures features;
    features.qtEnabled = false;
    features.qtKeywordsEnabled = false;
    features.qtMocRunEnabled = false;
    features.cxx11Enabled = true;
    features.c99Enabled = true;

    SimpleLexer tokenize;
    tokenize.setLanguageFeatures(features);

    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();

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    if (tokens.isEmpty() || pos <= tokens.first().utf16charsBegin())
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        return false;
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    if (pos >= tokens.last().utf16charsEnd()) {
        const Token tk = tokens.last();
        return tk.isStringLiteral() && prevState > 0;
    }

    Token tk = tokenAtPosition(tokens, pos);
    if (retToken)
        *retToken = tk;
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    return tk.isStringLiteral() && pos > tk.utf16charsBegin();
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}

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

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

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    if (!(MatchingText::shouldInsertMatchingText(cursor)
          || ch == QLatin1Char('\'')
          || ch == QLatin1Char('"')))
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        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.isStringLiteral() || token.isCharLiteral()) {
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        const unsigned pos = cursor.selectionEnd() - cursor.block().position();
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        if (pos <= token.utf16charsEnd())
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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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bool CppAutoCompleter::isInString(const QTextCursor &cursor) const
{
    return isInStringHelper(cursor);
}

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

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QString CppAutoCompleter::insertParagraphSeparator(const QTextCursor &cursor) const
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{
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    return MatchingText::insertParagraphSeparator(cursor);
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}
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