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    41 

    42 #include <QtGui>

    43 

    44 #include "highlighter.h"

    45 

    46 //! [0]

    47 Highlighter::Highlighter(QTextDocument *parent)

    48     : QSyntaxHighlighter(parent)

    49 {

    50     HighlightingRule rule;

    51 

    52     keywordFormat.setForeground(Qt::darkBlue);

    53     keywordFormat.setFontWeight(QFont::Bold);

    54     QStringList keywordPatterns;

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

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

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

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

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

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

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

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

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

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

    65     foreach (const QString &pattern, keywordPatterns) {

    66         rule.pattern = QRegExp(pattern);

    67         rule.format = keywordFormat;

    68         highlightingRules.append(rule);

    69 //! [0] //! [1]

    70     }

    71 //! [1]

    72 

    73 //! [2]

    74     classFormat.setFontWeight(QFont::Bold);

    75     classFormat.setForeground(Qt::darkMagenta);

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

    77     rule.format = classFormat;

    78     highlightingRules.append(rule);

    79 //! [2]

    80 

    81 //! [3]

    82     singleLineCommentFormat.setForeground(Qt::red);

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

    84     rule.format = singleLineCommentFormat;

    85     highlightingRules.append(rule);

    86 

    87     multiLineCommentFormat.setForeground(Qt::red);

    88 //! [3]

    89 

    90 //! [4]

    91     quotationFormat.setForeground(Qt::darkGreen);

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

    93     rule.format = quotationFormat;

    94     highlightingRules.append(rule);

    95 //! [4]

    96 

    97 //! [5]

    98     functionFormat.setFontItalic(true);

    99     functionFormat.setForeground(Qt::blue);

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

   101     rule.format = functionFormat;

   102     highlightingRules.append(rule);

   103 //! [5]

   104 

   105 //! [6]

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

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

   108 }

   109 //! [6]

   110 

   111 //! [7]

   112 void Highlighter::highlightBlock(const QString &text)

   113 {

   114     foreach (const HighlightingRule &rule, highlightingRules) {

   115         QRegExp expression(rule.pattern);

   116         int index = expression.indexIn(text);

   117         while (index >= 0) {

   118             int length = expression.matchedLength();

   119             setFormat(index, length, rule.format);

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

   121         }

   122     }

   123 //! [7] //! [8]

   124     setCurrentBlockState(0);

   125 //! [8]

   126 

   127 //! [9]

   128     int startIndex = 0;

   129     if (previousBlockState() != 1)

   130         startIndex = commentStartExpression.indexIn(text);

   131 

   132 //! [9] //! [10]

   133     while (startIndex >= 0) {

   134 //! [10] //! [11]

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

   136         int commentLength;

   137         if (endIndex == -1) {

   138             setCurrentBlockState(1);

   139             commentLength = text.length() - startIndex;

   140         } else {

   141             commentLength = endIndex - startIndex

   142                             + commentEndExpression.matchedLength();

   143         }

   144         setFormat(startIndex, commentLength, multiLineCommentFormat);

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

   146     }

   147 }

   148 //! [11]