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	isSyntaxHighlighting = YES;
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	isSyntaxHighlighting = YES;
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	NSString *selfstr    = [theTextStorage string];
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	NSString *selfstr    = [theTextStorage string];
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	NSInteger strlength  = (NSInteger)[selfstr length];
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	NSInteger strlength  = (NSInteger)[selfstr length];
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	// do not highlight if text larger than 10MB
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	if(strlength > 10000000) return;
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	// == Do highlighting partly (max R_SYNTAX_HILITE_BIAS*2 around visibleRange
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	// == Do highlighting partly (max R_SYNTAX_HILITE_BIAS*2 around visibleRange
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	// by considering entire lines).
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	// by considering entire lines).
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	// Get the text range currently displayed in the view port
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	// Get the text range currently displayed in the view port
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	NSRect visibleRect = [[[self enclosingScrollView] contentView] documentVisibleRect];
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	NSRect visibleRect = [[[self enclosingScrollView] contentView] documentVisibleRect];