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      1 grammar t046rewrite;
      2 options {
      3     language=Python;
      4 }
      5 
      6 program
      7 @init {
      8     start = self.input.LT(1)
      9 }
     10     :   method+
     11         {
     12         self.input.insertBefore(start,"public class Wrapper {\n")
     13         self.input.insertAfter($method.stop, "\n}\n")
     14         }
     15     ;
     16 
     17 method
     18     :   m='method' ID '(' ')' body
     19         {self.input.replace($m, "public void");}
     20     ; 
     21 
     22 body
     23 scope {
     24     decls
     25 }
     26 @init {
     27     $body::decls = set()
     28 }
     29     :   lcurly='{' stat* '}'
     30         {
     31         for it in $body::decls:
     32             self.input.insertAfter($lcurly, "\nint "+it+";")
     33         }
     34     ;
     35 
     36 stat:   ID '=' expr ';' {$body::decls.add($ID.text);}
     37     ;
     38 
     39 expr:   mul ('+' mul)* 
     40     ;
     41 
     42 mul :   atom ('*' atom)*
     43     ;
     44 
     45 atom:   ID
     46     |   INT
     47     ;
     48 
     49 ID  :   ('a'..'z'|'A'..'Z')+ ;
     50 
     51 INT :   ('0'..'9')+ ;
     52 
     53 WS  :   (' '|'\t'|'\n')+ {$channel=HIDDEN;}
     54     ;
     55