luaeditor/LuaHighlighter.cpp at master · mdombroski/luaeditor · GitHub

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#include "LuaHighlighter.h"

#include <QDebug>

namespace
{
	enum
	{
		bs_none = -1,
		bs_quote = 1,
		bs_comment = 2
	};
}

LuaHighlighter::LuaHighlighter( QTextDocument *parent )
	: QSyntaxHighlighter( parent )
{
	HighlightingRule rule;

	// function calls
	functionFormat.setForeground( Qt::blue );
	rule.pattern = QRegExp( QLatin1String( "\\b[A-Za-z0-9_]+(?=\\()" ) );
	rule.format = functionFormat;
	highlightingRules.append( rule );

	// keywords (from grammar)
	QStringList keywordPatterns;
	keywordPatterns << QLatin1String( "\\bfunction\\b" )
				<< QLatin1String( "\\bbreak\\b" )
				<< QLatin1String( "\\bgoto\\b" )
				<< QLatin1String( "\\bdo\\b" )
				<< QLatin1String( "\\bend\\b" )
				<< QLatin1String( "\\bwhile\\b" )
				<< QLatin1String( "\\brepeat\\b" )
				<< QLatin1String( "\\buntil\\b" )
				<< QLatin1String( "\\bif\\b" )
				<< QLatin1String( "\\bthen\\b" )
				<< QLatin1String( "\\belseif\\b" )
				<< QLatin1String( "\\belse\\b" )
				<< QLatin1String( "\\bfor\\b" )
				<< QLatin1String( "\\bin\\b" )
				<< QLatin1String( "\\blocal\\b" )
				<< QLatin1String( "\\bor\\b" )
				<< QLatin1String( "\\band\\b" )
				<< QLatin1String( "\\bnot\\b" )
				<< QLatin1String( "\\breturn\\b" );

	keywordFormat.setForeground( Qt::darkBlue );
	keywordFormat.setFontWeight( QFont::Bold );

	for( auto const& pattern : keywordPatterns )
	{
		rule.pattern = QRegExp( pattern );
		rule.format = keywordFormat;
		highlightingRules.append( rule );
	}

	// numbers, boolean, nil
	QStringList valuePatterns;
	valuePatterns << QLatin1String( "\\bnil\\b" )
				<< QLatin1String( "\\btrue\\b" )
				<< QLatin1String( "\\bfalse\\b" )
				<< QLatin1String( "\\b\\d+\\b" )
				<< QLatin1String( "\\b\\d+.\\b" )
				<< QLatin1String( "\\b\\d+e\\b" )
				<< QLatin1String( "\\b\\[\\dA-Fa-F]+\\b" );

	valueFormat.setForeground( Qt::red );
	valueFormat.setFontWeight( QFont::Normal );

	for( auto const& pattern : valuePatterns )
	{
		rule.pattern = QRegExp( pattern );
		rule.format = valueFormat;
		highlightingRules.append( rule );
	}

	// double quote "
	quotationFormat.setForeground( Qt::darkGreen );
	rule.pattern = QRegExp( QLatin1String( "\"[^\"]*\"" ) );
	rule.format = quotationFormat;
	highlightingRules.append( rule );

	// single quote '
	rule.pattern = QRegExp( QLatin1String( "\'[^\']*\'" ) );
	rule.format = quotationFormat;
	highlightingRules.append( rule );

	// multi line string [[ ]]
	quoteStartExpression = QRegExp( QLatin1String( "\\[\\[" ) ); // --[[
	quoteEndExpression = QRegExp( QLatin1String( "\\]\\]" ) ); // ]]

	// single line comments
	singleLineCommentFormat.setForeground( QColor( Qt::darkGray ).darker( 120 ) );
	rule.pattern = QRegExp( QLatin1String( "--[^\n]*") );
	rule.format = singleLineCommentFormat;
	highlightingRules.append( rule );

	//Multi Line Comment --[[ ]]
	commentStartExpression = QRegExp( QLatin1String( "--\\[\\[" ) ); // --[[
	commentEndExpression = QRegExp( QLatin1String( "\\]\\]" ) ); // ]]

	rule.pattern.setMinimal(false);
}

void LuaHighlighter::highlightBlock(const QString &text)
{
	for( auto const& 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( bs_none );

	//
	// multi-line strings
	//

	int start = -1;
	int prev = previousBlockState();

	if( prev == bs_quote )
	{
		start = 0;
	}
	if( prev == bs_none )
	{
		start = quoteStartExpression.indexIn( text );
	}

	while( start >= 0 )
	{
		int end = quoteEndExpression.indexIn( text, start );
		int length;

		if( end == -1 )
		{
			setCurrentBlockState( bs_quote );
			length = text.length() - start;
		}
		else
		{
			length = end - start + quoteEndExpression.matchedLength();
		}

		setFormat( start, length, quotationFormat );
		start = quoteStartExpression.indexIn( text, start + length );
	}

	//
	// multi-line comments
	//

	start = -1;
	if( prev == bs_comment )
	{
		start = 0;
	}
	if( prev == bs_none )
	{
		start = commentStartExpression.indexIn( text );
	}

	while( start >= 0 )
	{
		int end = commentEndExpression.indexIn( text, start );
		int length;

		if( end == -1 )
		{
			setCurrentBlockState( bs_comment );
			length = text.length() - start;
		}
		else
		{
			length = end - start + commentEndExpression.matchedLength();
		}

		setFormat( start, length, singleLineCommentFormat );
		start = commentStartExpression.indexIn( text, start + length );
	}
}