: QSyntaxHighlighter(parent)

{

ThemeManager mgr;

applyTheme(mgr.darkTheme());

rules.clear();

HighlightRule rule;

QTextCharFormat kwFmt;

kwFmt.setForeground(theme.keyword);

kwFmt.setFontWeight(QFont::Bold);

const QStringList keywords = {

"\\bauto\\b","\\bbool\\b","\\bbreak\\b","\\bcase\\b","\\bcatch\\b",

"\\bchar\\b","\\bclass\\b","\\bconst\\b","\\bconstexpr\\b","\\bcontinue\\b",

"\\bdefault\\b","\\bdelete\\b","\\bdo\\b","\\bdouble\\b","\\belse\\b",

"\\benum\\b","\\bexplicit\\b","\\bextern\\b","\\bfalse\\b","\\bfloat\\b",

"\\bfor\\b","\\bfriend\\b","\\bgoto\\b","\\bif\\b","\\binline\\b",

"\\bint\\b","\\blong\\b","\\bmutable\\b","\\bnamespace\\b","\\bnew\\b",

"\\bnoexcept\\b","\\bnullptr\\b","\\boperator\\b","\\bprivate\\b",

"\\bprotected\\b","\\bpublic\\b","\\breturn\\b","\\bshort\\b",

"\\bsigned\\b","\\bsizeof\\b","\\bstatic\\b","\\bstruct\\b",

"\\bswitch\\b","\\btemplate\\b","\\bthis\\b","\\bthrow\\b",

"\\btrue\\b","\\btry\\b","\\btypedef\\b","\\btypename\\b",

"\\bunion\\b","\\bunsigned\\b","\\busing\\b","\\bvirtual\\b",

"\\bvoid\\b","\\bvolatile\\b","\\bwhile\\b"

};

for (const QString &kw : keywords) {

rule.pattern = QRegularExpression(kw);

rule.format = kwFmt;

rules.append(rule);

}

QTextCharFormat ppFmt;

ppFmt.setForeground(theme.preprocessor);

rule.pattern = QRegularExpression("^\\s*#\\s*\\w+");

rule.format = ppFmt;

rules.append(rule);

QTextCharFormat strFmt;

strFmt.setForeground(theme.string);

rule.pattern = QRegularExpression("\"(?:[^\"\\\\]|\\\\.)*\"");

rule.format = strFmt;

rules.append(rule);

rule.pattern = QRegularExpression("'(?:[^'\\\\]|\\\\.)*'");

rules.append(rule);

QTextCharFormat numFmt;

numFmt.setForeground(theme.number);

rule.pattern = QRegularExpression("\\b(0x[0-9A-Fa-f]+|\\d+\\.?\\d*)\\b");

rule.format = numFmt;

rules.append(rule);

QTextCharFormat fnFmt;

fnFmt.setForeground(theme.function);

rule.pattern = QRegularExpression("\\b([a-zA-Z_][a-zA-Z0-9_]*)\\s*(?=\\()");

rule.format = fnFmt;

rules.append(rule);

QTextCharFormat cmtFmt;

cmtFmt.setForeground(theme.comment);

cmtFmt.setFontItalic(true);

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

rule.format = cmtFmt;

rules.append(rule);

multiLineCommentFormat = cmtFmt;

commentStart = QRegularExpression("/\\*");

commentEnd = QRegularExpression("\\*/");

for (const HighlightRule &rule : rules) {

QRegularExpressionMatchIterator it = rule.pattern.globalMatch(text);

while (it.hasNext()) {

QRegularExpressionMatch m = it.next();

setFormat(m.capturedStart(), m.capturedLength(), rule.format);

}

}

setCurrentBlockState(0);

int startIdx = 0;

if (previousBlockState() != 1)

startIdx = text.indexOf(commentStart);

while (startIdx >= 0) {

QRegularExpressionMatch endMatch = commentEnd.match(text, startIdx);

int commentLen;

if (!endMatch.hasMatch()) {

setCurrentBlockState(1);

commentLen = text.length() - startIdx;

} else {

commentLen = endMatch.capturedStart() - startIdx + endMatch.capturedLength();

}

setFormat(startIdx, commentLen, multiLineCommentFormat);

startIdx = text.indexOf(commentStart, startIdx + commentLen);

}