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#include <QtGui>

#include "highlighter.h"

//! [0]

Highlighter::Highlighter(QTextDocument *parent)

    : QSyntaxHighlighter(parent)

{

    HighlightingRule rule;

    keywordFormat.setForeground(Qt::darkBlue);

    keywordFormat.setFontWeight(QFont::Bold);

    QStringList keywordPatterns;

    keywordPatterns << "\\bchar\\b" << "\\bclass\\b" << "\\bconst\\b"

                    << "\\bdouble\\b" << "\\benum\\b" << "\\bexplicit\\b"

                    << "\\bfriend\\b" << "\\binline\\b" << "\\bint\\b"

                    << "\\blong\\b" << "\\bnamespace\\b" << "\\boperator\\b"

                    << "\\bprivate\\b" << "\\bprotected\\b" << "\\bpublic\\b"

                    << "\\bshort\\b" << "\\bsignals\\b" << "\\bsigned\\b"

                    << "\\bslots\\b" << "\\bstatic\\b" << "\\bstruct\\b"

                    << "\\btemplate\\b" << "\\btypedef\\b" << "\\btypename\\b"

                    << "\\bunion\\b" << "\\bunsigned\\b" << "\\bvirtual\\b"

                    << "\\bvoid\\b" << "\\bvolatile\\b";

    foreach (const QString &pattern, keywordPatterns) {

        rule.pattern = QRegExp(pattern);

        rule.format = keywordFormat;

        highlightingRules.append(rule);

//! [0] //! [1]

    }

//! [1]

//! [2]

    classFormat.setFontWeight(QFont::Bold);

    classFormat.setForeground(Qt::darkMagenta);

    rule.pattern = QRegExp("\\bQ[A-Za-z]+\\b");

    rule.format = classFormat;

    highlightingRules.append(rule);

//! [2]

//! [3]

    singleLineCommentFormat.setForeground(Qt::red);

    rule.pattern = QRegExp("//[^\n]*");

    rule.format = singleLineCommentFormat;

    highlightingRules.append(rule);

    multiLineCommentFormat.setForeground(Qt::red);

//! [3]

//! [4]

    quotationFormat.setForeground(Qt::darkGreen);

    rule.pattern = QRegExp("\".*\"");

    rule.format = quotationFormat;

    highlightingRules.append(rule);

//! [4]

//! [5]

    functionFormat.setFontItalic(true);

    functionFormat.setForeground(Qt::blue);

    rule.pattern = QRegExp("\\b[A-Za-z0-9_]+(?=\\()");

    rule.format = functionFormat;

    highlightingRules.append(rule);

//! [5]

//! [6]

    commentStartExpression = QRegExp("/\\*");

    commentEndExpression = QRegExp("\\*/");

}

//! [6]

//! [7]

void Highlighter::highlightBlock(const QString &text)

{

    foreach (const HighlightingRule &rule, highlightingRules) {

        QRegExp expression(rule.pattern);

        int index = expression.indexIn(text);

        while (index >= 0) {

            int length = expression.matchedLength();

            setFormat(index, length, rule.format);

            index = expression.indexIn(text, index + length);

        }

    }

//! [7] //! [8]

    setCurrentBlockState(0);

//! [8]

//! [9]

    int startIndex = 0;

    if (previousBlockState() != 1)

        startIndex = commentStartExpression.indexIn(text);

//! [9] //! [10]

    while (startIndex >= 0) {

//! [10] //! [11]

        int endIndex = commentEndExpression.indexIn(text, startIndex);

        int commentLength;

        if (endIndex == -1) {

            setCurrentBlockState(1);

            commentLength = text.length() - startIndex;

        } else {

            commentLength = endIndex - startIndex

                            + commentEndExpression.matchedLength();

        }

        setFormat(startIndex, commentLength, multiLineCommentFormat);

        startIndex = commentStartExpression.indexIn(text, startIndex + commentLength);

    }

}

//! [11]