I'm looking for an example (in XText) of how to implement code completion on an user defined objects members. As far as I can see I need to use IScope, but how all this wires together is unclear.
Given that trait
is a user defined type, how do I go about building a grammar to code complete / validate the methods contained within String
when I type name.
?
trait String {
def toLowerCase(): String
def toUpperCase(): String
}
val name = new String()
name.toLowerCase()
Thanks
It highly depends on your grammar what you have to do to adopt scoping. Let us say you have a grammar like
Model:
statements+=Statement+
;
Statement:
Trait | VarDef | Call
;
Trait:
"trait" name=ID "{"
ops+=Operation*
"}"
;
Operation:
"def" name=ID "()" ":" type=[Trait]
;
VarDef:
"val" name=ID "=" "new" type=[Trait] "()"
;
Call:
var=[VarDef] "." op=[Operation] "()"
;
then your scopeprovider would look like
public class MyDslScopeProvider extends AbstractDeclarativeScopeProvider {
IScope scope_Call_op(Call call, EReference ref) {
return Scopes.scopeFor(call.getVar().getType().getOps());
}
}
You can find a blog series on the topic here:
https://web.archive.org/web/20130129085620/http://blogs.itemis.de/stundzig/archives/773