XText cross-referencing: How to establish references between locally unique IDs, using their context as a qualifier? -

i have problem cross-referencing terminals locally unique (in block/scope), not globally. found tutorials describe, how can use qualified names or package declarations, case syntactically little bit different example , cannot change dsl support explicit qualified names or package declarations.

in dsl have 2 types of structured json resources:

• the instance contains data.
• a meta model, containing type information etc. data.

i can parse two, , emf model following java snippet:

new mydslstandalonesetup().createinjectoranddoemfregistration(); resourceset rs = new resourcesetimpl(); rs.getresource(uri.createplatformresourceuri("/foo/meta.json", true), true); resource instanceresource= rs.getresource(uri.createplatformresourceuri("/bar/instance.json", true), true); eobject eobject = instanceresource.getcontents().get(0); 

simplyfied example:

meta.json

{     "toplevel_1": {         "sublevels": {             "sublevel_1": {                 "type": "int"             },             "sublevel_2": {                 "type": "long"             }         }     },     "toplevel_2": {         "sublevels": {             "sublevel_1": {                 "type": "float"             },             "sublevel_2": {                 "type": "double"             }         }     } } 

instance.json

{     "toplevel_1": {         "sublevel_1": "1",         "sublevel_2": "2"     },     "toplevel_2": {         "sublevel_1": "3",         "sublevel_2": "4"     } } 

from want infer that:

• toplevel_1:sublevel_1 has type int , value 1
• toplevel_1:sublevel_2 has type long , value 2
• toplevel_2:sublevel_1 has type float , value 3
• toplevel_2:sublevel_2 has type double , value 4

i able cross-reference unique toplevel-elements , iterate on sublevels until found ones looking for, use case quite inefficient , complicated. also, don't generated editor link between sublevels way.

i played around linking , scoping, i'm unsure need, , if have extend providers-classes abstractdeclarativescopeprovider and/or defaultdeclarativequalifiednameprovider.

what's best way go?

see also:

• xtext cross reference using custom terminal rule
• http://www.eclipse.org/xtext/documentation.html#scoping
• http://www.eclipse.org/xtext/documentation.html#linking

after trial , error solved problem scopeprovider. main issue didn't understand scope in xtext-terms, , have provide to.

looking @ signature documentation:

iscope scope_<refdeclaringeclass>_<reference>(<contexttype> ctx, ereference ref) 

in example language:

• refdeclaringeclass refer sublevel instance.json,
• reference cross-reference sublevel meta.json, and
• contexttype match refdeclaringeclass.

using econtainer of ctx can toplevel instance.json. toplevel has cross-reference matching toplevel meta.json, can use sublevels meta.json. collection of sublevels scope within current sublevel should unique.

to iscope used scopes#scopefor(iterable).

i didn't post code here because actual grammar bigger/different, , therefore doesn't explanation.