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<title>Qt 4.6: highlighter.cpp Example File (richtext/syntaxhighlighter/highlighter.cpp)</title>
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#include <QtGui>
#include "highlighter.h"
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);
}
classFormat.setFontWeight(QFont::Bold);
classFormat.setForeground(Qt::darkMagenta);
rule.pattern = QRegExp("\\bQ[A-Za-z]+\\b");
rule.format = classFormat;
highlightingRules.append(rule);
singleLineCommentFormat.setForeground(Qt::red);
rule.pattern = QRegExp("<span class="comment">//[^\n]*");</span>
rule.format = singleLineCommentFormat;
highlightingRules.append(rule);
multiLineCommentFormat.setForeground(Qt::red);
quotationFormat.setForeground(Qt::darkGreen);
rule.pattern = QRegExp("\".*\"");
rule.format = quotationFormat;
highlightingRules.append(rule);
functionFormat.setFontItalic(true);
functionFormat.setForeground(Qt::blue);
rule.pattern = QRegExp("\\b[A-Za-z0-9_]+(?=\\()");
rule.format = functionFormat;
highlightingRules.append(rule);
commentStartExpression = QRegExp("/\\*");
commentEndExpression = QRegExp("\\*/");
}
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);
}
}
setCurrentBlockState(0);
int startIndex = 0;
if (previousBlockState() != 1)
startIndex = commentStartExpression.indexIn(text);
while (startIndex >= 0) {
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);
}
}</pre>
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