80 lines
3.0 KiB
C++
80 lines
3.0 KiB
C++
#include "./javascripthighlighter.h"
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namespace QtGui {
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JavaScriptHighlighter::JavaScriptHighlighter(QTextDocument *parent)
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: QSyntaxHighlighter(parent)
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{
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HighlightingRule rule;
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m_keywordFormat.setForeground(Qt::darkBlue);
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m_keywordFormat.setFontWeight(QFont::Bold);
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QStringList keywordPatterns;
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keywordPatterns.reserve(14);
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keywordPatterns << QStringLiteral("\\bvar\\b") << QStringLiteral("\\bArray\\b") << QStringLiteral("\\bfunction\\b")
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<< QStringLiteral("\\breturn\\b") << QStringLiteral("\\barguments\\b") << QStringLiteral("\\bif\\b")
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<< QStringLiteral("\\belse\\b") << QStringLiteral("\\bfor\\b") << QStringLiteral("\\bswitch\\b")
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<< QStringLiteral("\\bcase\\b") << QStringLiteral("\\bbreak\\b") << QStringLiteral("\\bwhile\\b")
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<< QStringLiteral("\\bundefined\\b") << QStringLiteral("\\continue\\b");
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for(const QString &pattern : keywordPatterns) {
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rule.pattern = QRegExp(pattern);
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rule.format = m_keywordFormat;
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m_highlightingRules.append(rule);
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}
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m_singleLineCommentFormat.setForeground(Qt::red);
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rule.pattern = QRegExp(QStringLiteral("//[^\n]*"));
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rule.format = m_singleLineCommentFormat;
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m_highlightingRules.append(rule);
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m_multiLineCommentFormat.setForeground(Qt::red);
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m_quotationFormat.setForeground(Qt::darkGreen);
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rule.pattern = QRegExp(QStringLiteral("\".*\""));
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rule.format = m_quotationFormat;
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m_highlightingRules.append(rule);
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m_functionFormat.setFontItalic(true);
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m_functionFormat.setForeground(Qt::blue);
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rule.pattern = QRegExp(QStringLiteral("(?!if)\\b[A-Za-z0-9_]+(?=\\()"));
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rule.format = m_functionFormat;
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m_highlightingRules.append(rule);
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m_commentStartExpression = QRegExp(QStringLiteral("/\\*"));
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m_commentEndExpression = QRegExp(QStringLiteral("\\*/"));
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}
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void JavaScriptHighlighter::highlightBlock(const QString &text)
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{
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for(const HighlightingRule &rule : m_highlightingRules) {
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QRegExp expression(rule.pattern);
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int index = expression.indexIn(text);
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while (index >= 0) {
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int length = expression.matchedLength();
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setFormat(index, length, rule.format);
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index = expression.indexIn(text, index + length);
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}
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}
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setCurrentBlockState(0);
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int startIndex = 0;
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if (previousBlockState() != 1) {
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startIndex = m_commentStartExpression.indexIn(text);
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}
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while (startIndex >= 0) {
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int endIndex = m_commentEndExpression.indexIn(text, startIndex);
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int commentLength;
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if (endIndex == -1) {
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setCurrentBlockState(1);
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commentLength = text.length() - startIndex;
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} else {
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commentLength = endIndex - startIndex + m_commentEndExpression.matchedLength();
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}
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setFormat(startIndex, commentLength, m_multiLineCommentFormat);
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startIndex = m_commentStartExpression.indexIn(text, startIndex + commentLength);
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}
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}
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}
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