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      1 grammar t046rewrite;
      2 options {
      3     language=JavaScript;
      4 }
      5 
      6 program
      7 @init {
      8     var start = this.input.LT(1);
      9 }
     10     :   method+
     11         {
     12         this.input.insertBefore(start,"public class Wrapper {\n")
     13         this.input.insertAfter($method.stop, "\n}\n")
     14         }
     15     ;
     16 
     17 method
     18     :   m='method' ID '(' ')' body
     19         {this.input.replace($m, "public void");}
     20     ; 
     21 
     22 body
     23 scope {
     24     decls
     25 }
     26 @init {
     27     $body::decls = {};
     28 }
     29     :   lcurly='{' stat* '}'
     30         {
     31         var it;
     32         for (it in $body::decls) {
     33             this.input.insertAfter($lcurly, "\nint "+it+";")
     34         }
     35         }
     36     ;
     37 
     38 stat:   ID '=' expr ';' {$body::decls[$ID.text] = true;}
     39     ;
     40 
     41 expr:   mul ('+' mul)* 
     42     ;
     43 
     44 mul :   atom ('*' atom)*
     45     ;
     46 
     47 atom:   ID
     48     |   INT
     49     ;
     50 
     51 ID  :   ('a'..'z'|'A'..'Z')+ ;
     52 
     53 INT :   ('0'..'9')+ ;
     54 
     55 WS  :   (' '|'\t'|'\n')+ {$channel=HIDDEN;}
     56     ;
     57