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Content assist and validation [message #901359]

Sat, 11 August 2012 12:06

Stefan Nikolic

Messages: 2
Registered: May 2012

Junior Member

Hello everyone,

I have a question about customizing content assist in Xtext.

I have defined grammar for my DSL named 'ISDesLanguage'. Also, I did some custom validation
by defining number of semantic constraints in class 'ISDesLanguageJavaValidator'.
Everythig works fine, except that content assist do not take into consideration these semantic constraints.

For example, if I have grammar:

Project : "Project" name=ID "{"
"Items" "{" (items+=Item)*"}"
"ItemSets" "{" (itemSets+=ItemSet)*"}"
"}";
Item : "Item" name=ID ;
ItemSet: "ItemSet" name=ID "{"(items+=[Item])* "}";

And if I introduce validation constraint that each item can be included in maximum one item set,
then validation works fine, but content assist still proposes every single item as a candidate
for including in every item set.

I am wondering what is the best way to include these semantic constraints from validator in content assist?
I know that customization of content assist is done by (re)defining methods in class 'ISDesLanguageProposalProvider'.
Is there some given way to simply attach 'ISDesLanguageJavaValidator' to 'ISDesLanguageProposalProvider', or I will
have to implement these semantics again in 'ISDesLanguageProposalProvider'?

Thank you in advance, Stefan.

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