[antlr-interest] Expr.text null?

[Foust]

Does it make sense that a matched sub-rule returns null for its text
attribute?

 

That is, the following rule matches the input AST just fine.

 

tree grammar;

expr : a? b;

 

a : ^(SOME_TOKEN someargs)

b: ^(etc.)

 

 

But when the text of a is desired, it always returns null, whether in the
rule action, or in a sub-rule action, as below:

 

expr : (a {System.out.println($a.text); } )?  b  ;

 

prints "null".

 

 

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