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Customizing Syntax Highlighting [message #1006210]

Wed, 30 January 2013 13:24

Phil H

Messages: 267
Registered: November 2012

Senior Member

Hi,

I've tried out to customize my Syntax Highlighting and have got two questions.

1. I've have implemented the necessary classes for customizing the Syntax Highlighting for one element of my grammar (which works so far). But then, the standrad Syntax Highlighting i.e. key word highlightig doesn't work anymore. Is this normal behaviuour?

2. In my grammar, one element consist of a Boolean flag. Depending on true or false, I want to change the Syntax Highlighting for this element. But I don't know how to access the Boolean attribute out of the ISemanticHighlightingCalculator. I used INodes so far:

public void provideHighlightingFor(XtextResource resource,
			IHighlightedPositionAcceptor acceptor) {

		if (resource == null || resource.getParseResult() == null)
			return;

		INode root = resource.getParseResult().getRootNode();
		BidiTreeIterator<INode> iterator = root.getAsTreeIterable().iterator();
		while (iterator.hasNext()) {
			INode node = iterator.next();
			if (node.getSemanticElement() instanceof ParameterDesc) {
				// What I want to have:
                                // if (pdesc.isUnselected() == true) { do something }
			}
		}
}

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Re: Customizing Syntax Highlighting [message #1006319 is a reply to message #1006210]

Wed, 30 January 2013 19:48

Christian Dietrich

Messages: 13359
Registered: July 2009

Senior Member

Hi,

(1) it (syntacic highlighting) may not work for the particular place you provide semantic highlighting for (offset,length) but for other places

(2) i do not unserstand your question - simply downcast from EObject to ParameterDesc

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Re: Customizing Syntax Highlighting [message #1006347 is a reply to message #1006319]

Wed, 30 January 2013 22:54

Phil H

Messages: 267
Registered: November 2012

Senior Member

Ok the second question is solved..

But again to the first question. I implemented the belowed code into MySemanticHighlightingCalculator and the color for the one element changes as expected. But the default Syntax Highlighting, like the purple color for keywords didn't work anymore. That's what I don't understand. Is the reason maybe that I iterating through the whole tree?

public void provideHighlightingFor(XtextResource resource,
			IHighlightedPositionAcceptor acceptor) {

		if (resource == null || resource.getParseResult() == null)
			return;

		INode root = resource.getParseResult().getRootNode();
		BidiTreeIterator<INode> iterator = root.getAsTreeIterable().iterator();
		while (iterator.hasNext()) {
			INode node = iterator.next();
			if (node.getSemanticElement() instanceof ParameterDesc) {
				ParameterDesc paramdesc = (ParameterDesc) node
						.getSemanticElement();
				if (paramdesc.isUnselected() == true) {
					setStyles(
							acceptor,
							iterator,
							MySemanticHighlightingConfiguration.PARAMETER_DESCRIPTION);
				}
			}
		}
	}

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Re: Customizing Syntax Highlighting [message #1006351 is a reply to message #1006347]

Wed, 30 January 2013 23:25

Christian Dietrich

Messages: 13359
Registered: July 2009

Senior Member

Strange your code is looking

INode root = resource.getParseResult().getRootNode();
BidiTreeIterator<INode> iterator = root.getAsTreeIterable().iterator();
while (iterator.hasNext()) {
INode node = iterator.next();
if(...)
acceptor.addPosition(node.getOffset(), node.getLength(), MYHighlightingConfiguration.MY_ID);

}
}

Need professional support for Xtext, Xpand, EMF?
Go to: https://www.itemis.com/en/xtext/
Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

[Updated on: Wed, 30 January 2013 23:25]

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Re: Customizing Syntax Highlighting [message #1006352 is a reply to message #1006351]

Wed, 30 January 2013 23:27

Christian Dietrich

Messages: 13359
Registered: July 2009

Senior Member

P.S: the default highlighting will not be applyed between offset and offset+length cause you define explicitely the style for that region

Need professional support for Xtext, Xpand, EMF?
Go to: https://www.itemis.com/en/xtext/
Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Customizing Syntax Highlighting [message #1006444 is a reply to message #1006352]

Thu, 31 January 2013 11:22

Phil H

Messages: 267
Registered: November 2012

Senior Member

Hmm, no the default highlighting doesn't work for the whole document :/
But when I remove this from MyDSLUiModule, the default highlighting work again:

public Class<? extends IHighlightingConfiguration> bindIHighlightingConfiguration() {
		return MySemanticHighlightingConfiguration.class;
	}

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Re: Customizing Syntax Highlighting [message #1006793 is a reply to message #1006444]

Fri, 01 February 2013 23:01

Phil H

Messages: 267
Registered: November 2012

Senior Member

any suggestions on this?

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Re: Customizing Syntax Highlighting [message #1007141 is a reply to message #1006793]

Mon, 04 February 2013 15:35

Henrik Lindberg

Messages: 2509
Registered: July 2009

Senior Member

On 2013-02-02 24:01, Phil H wrote:
> any suggestions on this?
Not really, but I did write a highlighter that does semantic as well as
textual highlighting in cloudsmith / geppetto @ github. It may be worth
taking a look at.

Regards
- henrik

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