[antlr-interest] Api question.

[Kenneth Domino]

Is there an API in the runtime to access the grammar during a parse?  I'm 
interested in knowing the rule and point in the rule corresponding to the 
action routine, making the action routine aware about the grammar itself. 
For example, an AST encoding "Expr:  Expr # { code(GiveMeMarkedUpAST()); } 
'+' Expr | Expr '-' Expr" would mean that the action "code()" is within the 
Expr rule, the first alternative.  This information is returned by the 
runtime code "GiveMeMarkedUpAST()".  The "#" would indicate the location of 
the parse action, like the dot used in LR items.  I could create a scheme to 
inform my action routine this information but I'm looking to see if Antlr 
can provide knowledge about the grammar in the form of an AST to the action.