Consider the following Ecore model (in Xcore notation):
class Foo {
contains Element[] elements
}
class Bar extends Foo {
int n
}
class Element {
String name
}
and the following Xtext rules:
FooBar: Foo | Bar;
Foo: {Foo} 'foo' '{' elements+=Element (',' elements+=Element)* '}';
Foo: {Bar} 'bar' n=INT '{' elements+=Element (',' elements+=Element)* '}';
Element: {Element} name=ID;
such that textual models are like this:
foo {one, two}
bar 2 {three, four}
Is there a way to refactor the repetition away from the rules? I know I could introduce a new EClass ElementContain and make rules for Foo and Bar refer to its rule, however, that would clutter the metamodel.
generally: no. but if the only difference is the first keyword:
FooBar:
({Foo} 'foo' | {Bar}'bar') '{' elements+=Element (',' elements+=Element)* '}';
Element: {Element} name=ID;
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