Xtext enum value setting -

i have ecore metamodel this

pattern   direction:direction   patterndetail:details  direction   both=0   left=1   right=2 

this simplification representation of graph query language use patterns. pattern direction , details (name, whatever)

in grammar want parse input direction information on 2 places, example

<-[patterndetails]-> (direction = both) -[patterndetails]->  (direction = right) <-[patterndetails]-  (direction = left) 

so have created rule

pattern returns pattern:     '<-'patterndetails=patterndetails'->'     |'<-'patterndetails=patterndetails'-'     |'-'patterndetails=patterndetails'->'     ; 

but can't figure out how can set direction associated. try add direction=direction.both @ end of first line not possible. seems strange because possible affect value estring attribute example, not enums.

am missing on enum access or doing wrong ?

you can have multiple rules same enum

pattern returns pattern:     '<-' patterndetails=patterndetails direction=both     | '<-' patterndetails=patterndetails direction=left     | '-' patterndetails=patterndetails direction=right;  enum direction:     both |     left |     right;  enum both returns direction:     both='->';  enum right returns direction:     right='->';  enum left returns direction:     left='-';