Hi,
I keep running into questions like this, and don't know how to answer them.
Could anyone look at this simple example and tell me how I would accomplish my
goal? I think I've got a central concept mixed up in my head.
What I'm trying to do is under the "array" rule below, where I'm trying to
create a rewrite rule which collects elements which are within a grouping
construct. This seems to come up a lot for me, and I don't get how to do it.
While we're at it, what is the easiest way to strip the " " characters from the
strings?
Thanks for any help! Here's the grammar excerpt:
tokens { ARRAY; }
@header { using System; }
public prog: ( stat {Console.WriteLine(
$stat.tree==null?"null":$stat.tree.ToStringTree());} )+ ;
stat: assign | block | ';'! ;
block: ID^ ID '{'! (assign)+ '}'! ;
assign: ID '='^ (atom | array) ';'! ;
atom: FLOAT | ID | STRING ;
array: '[' ((FLOAT)+ | (STRING)+) ']' -> ^(ARRAY _FLOATS_OR_STRINGS_ ) ;
fragment LETTER : '$'| 'A'..'Z' | 'a'..'z' | '_' ;
fragment DIGITS : ('0'..'9')+;
fragment EXP : ('e'|'E') ('+'|'-')? ('0'..'9')+ ;
STRING : '"' ( ~('"') )* '"' ;
ID : LETTER (LETTER|DIGITS)*;
FLOAT : (DIGITS? '.' DIGITS EXP?) | (DIGITS EXP?) ;
WS : (' '|'\t'|'\n'|'\r')+ {Skip();} ;
- Andy
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