regexp.cpp Example File

    /****************************************************************************
     **
     ** Portions Copyright (C) 2012 Research In Motion Limited.
     ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
     ** All rights reserved.
     ** Contact: Research In Motion Ltd. (http://www.rim.com/company/contact/)
     ** Contact: Nokia Corporation (qt-info@nokia.com)
     **
     ** This file is part of the examples of the BB10 Platform and is derived
     ** from a similar file that is part of the Qt Toolkit.
     **
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of Research In Motion, nor the name of Nokia
     **     Corporation and its Subsidiary(-ies), nor the names of its
     **     contributors may be used to endorse or promote products
     **     derived from this software without specific prior written
     **     permission.
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
     **
     ****************************************************************************/

    #include "regexp.hpp"

    static const int s_capturesCount = 6;

    RegExp::RegExp(QObject *parent)
        : QObject(parent)
        , m_pattern("[A-Za-z_]+([A-Za-z_0-9]*)")
        , m_patternSyntax(QRegExp::RegExp)
        , m_caseSensitive(true)
        , m_minimal(false)
        , m_text("(10 + delta4) * 32")
        , m_matchIndex(-1)
        , m_matchLength(-1)
    {
        // Initialize the list of captures with 'no captures available'
        for (int i = 0; i < s_capturesCount; ++i) {
            Capture capture;
            capture.available = false;

            m_captures << capture;
        }

        // Start initial processing
        refresh();
    }

    void RegExp::setPattern(const QString &pattern)
    {
        if (m_pattern == pattern)
            return;

        m_pattern = pattern;
        refresh();

        emit patternChanged();
    }

    QString RegExp::pattern() const
    {
        return m_pattern;
    }

    void RegExp::setPatternSyntax(QRegExp::PatternSyntax syntax)
    {
        if (m_patternSyntax == syntax)
            return;

        m_patternSyntax = syntax;
        refresh();
    }

    QString RegExp::escapedPattern() const
    {
        return m_escapedPattern;
    }

    void RegExp::setCaseSensitive(bool caseSensitive)
    {
        if (m_caseSensitive == caseSensitive)
            return;

        m_caseSensitive = caseSensitive;
        refresh();

        emit caseSensitiveChanged();
    }

    bool RegExp::caseSensitive() const
    {
        return m_caseSensitive;
    }

    void RegExp::setMinimal(bool minimal)
    {
        if (m_minimal == minimal)
            return;

        m_minimal = minimal;
        refresh();

        emit minimalChanged();
    }

    bool RegExp::minimal() const
    {
        return m_minimal;
    }

    void RegExp::setText(const QString &text)
    {
        if (m_text == text)
            return;

        m_text = text;
        refresh();

        emit textChanged();
    }

    QString RegExp::text() const
    {
        return m_text;
    }

    int RegExp::matchIndex() const
    {
        return m_matchIndex;
    }

    int RegExp::matchLength() const
    {
        return m_matchLength;
    }

    bool RegExp::capture0Available() const
    {
        return m_captures.at(0).available;
    }

    QString RegExp::capture0Text() const
    {
        return m_captures.at(0).text;
    }

    bool RegExp::capture1Available() const
    {
        return m_captures.at(1).available;
    }

    QString RegExp::capture1Text() const
    {
        return m_captures.at(1).text;
    }

    bool RegExp::capture2Available() const
    {
        return m_captures.at(2).available;
    }

    QString RegExp::capture2Text() const
    {
        return m_captures.at(2).text;
    }

    bool RegExp::capture3Available() const
    {
        return m_captures.at(3).available;
    }

    QString RegExp::capture3Text() const
    {
        return m_captures.at(3).text;
    }

    bool RegExp::capture4Available() const
    {
        return m_captures.at(4).available;
    }

    QString RegExp::capture4Text() const
    {
        return m_captures.at(4).text;
    }

    bool RegExp::capture5Available() const
    {
        return m_captures.at(5).available;
    }

    QString RegExp::capture5Text() const
    {
        return m_captures.at(5).text;
    }

    void RegExp::refresh()
    {
        // Create the escaped version of the pattern string ...
        QString escaped = m_pattern;
        escaped.replace("\\", "\\\\");
        escaped.replace("\"", "\\\"");
        escaped.prepend("\"");
        escaped.append("\"");

        // ... and store it.
        m_escapedPattern = escaped;

        // Create a temporary QRegExp object with the current pattern as parameter
        QRegExp regexp(m_pattern);

        // Configure the QRegExp object according to the other input parameters
        regexp.setCaseSensitivity(m_caseSensitive ? Qt::CaseSensitive : Qt::CaseInsensitive);
        regexp.setMinimal(m_minimal);
        regexp.setPatternSyntax(m_patternSyntax);

        // Do the actual pattern matching against the input string (m_text) ...
        m_matchIndex = regexp.indexIn(m_text);

        // ... and fill the output parameters with the new values.
        m_matchLength = regexp.matchedLength();

        for (int i = 0; i < s_capturesCount; ++i) {
            m_captures[i].available = (i <= regexp.captureCount());
            m_captures[i].text = regexp.cap(i);
        }

        // Notify the UI that the output parameters have changed
        emit regexpChanged();
    }