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Xtext web content proposal [message #1745739]

Sun, 16 October 2016 20:40

Daniel B.

Messages: 4
Registered: September 2016

Junior Member

Hi,

I have some trouble understanding how I can create custom content proposals.

Let's assume I have an array with some strings I want to propose as content within a specific grammar rule.
I would think that I need to write a new method that handles the proposals for that specific rule.
A subclass of IdeContentProposalProvider with the createProposals method for my rule would be needed and I would bind it in my web module. (As stated in this thread )

To get a better understanding I also had a look at the example linked. (https://github.com/eclipse/xtext/blob/v2.9.0/plugins/org.eclipse.xtext.ide/src/org/eclipse/xtext/ide/editor/contentassist/IdeContentProposalProvider.xtend )

The first thing I have noticed is that the parameters of the method mentioned in the thread is totally different from those in the example. Therefore I am very unsure how I can access the rules within the createProposals method.

To sum my question up:
Could someone please give me a full example of the subclass of IdeContentProposalProvider for a grammar:

Model:
    elements+=Element;

Element:
    (foo=Foo | bar=Bar);

Bar:
    '-->'text=ID'<--';

If I want to propose one of the following Strings within the arrows of the rule Bar.

["FooBar", "Test", "Example"]

An example would surely help me understanding the process of providing the proposals.

Thank you.

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Re: Xtext web content proposal [message #1745743 is a reply to message #1745739]

Mon, 17 October 2016 03:45

Christian Dietrich

Messages: 14498
Registered: July 2009

Senior Member

hi, i cannot really follow you. here is one of 10000 possible impls

package org.xtext.example.mydsl.ide

import java.util.Collection
import javax.inject.Inject
import org.eclipse.xtext.ide.editor.contentassist.ContentAssistContext
import org.eclipse.xtext.ide.editor.contentassist.IIdeContentProposalAcceptor
import org.eclipse.xtext.ide.editor.contentassist.IdeContentProposalProvider
import org.xtext.example.mydsl.services.MyDslGrammarAccess

class MyDslIdeProposalProvider extends IdeContentProposalProvider {
	
	@Inject
	MyDslGrammarAccess ga
	
	override createProposals(Collection<ContentAssistContext> contexts, IIdeContentProposalAcceptor acceptor) {
		super.createProposals(contexts, acceptor)
		for (context : contexts) {
			for (ge : context.firstSetGrammarElements) {
				if (ga.barAccess.textAssignment_1 == ge) {
					for (element : #["FooBar", "Test", "Example"].filter[startsWith(context.prefix)]) {
						val entry = proposalCreator.createProposal(element, context)
						val prio = proposalPriorities.getDefaultPriority(entry)
						acceptor.accept(entry, prio)
					}
				}
			}
		}
	}
	
}

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Re: Xtext web content proposal [message #1745744 is a reply to message #1745743]

Mon, 17 October 2016 03:48

Christian Dietrich

Messages: 14498
Registered: July 2009

Senior Member

p.s. and yes you could override

org.eclipse.xtext.ide.editor.contentassist.IdeContentProposalProvider.createProposals(AbstractElement, ContentAssistContext, IIdeContentProposalAcceptor)

or

_createProposals(Assignment assignment, ContentAssistContext context, IIdeContentProposalAcceptor acceptor)

or

org.eclipse.xtext.ide.editor.contentassist.IdeContentProposalProvider._createProposals(RuleCall, ContentAssistContext, IIdeContentProposalAcceptor)

or one of the other _createProposals methods
as well

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

[Updated on: Mon, 17 October 2016 03:51]

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Re: Xtext web content proposal [message #1745876 is a reply to message #1745744]

Tue, 18 October 2016 16:54

Daniel B.

Messages: 4
Registered: September 2016

Junior Member

Maybe I understood the concept totally wrong.

If I try to use your example I get errors compiling the files. I can't either import the GrammarAccess nor is the proposalCreator defined.

If I search within the project for my GrammarAccess I can find it imported in other files using the same URI without any problems. Somehow the problem just occurs within the ProposalProvider subclass.

Where should I find the proposalCreator or the method createProposal? No hits within my project. Just createProposals is found and even that just in my MyDslIdeProposalProvider.

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