[antlr-interest] Need help on constructing trees

[Mo]

Hi kototama,

assuming that you want your code to  look like:

public foo (blah) {

 method methodName(blah) {
   }

}


then the following will build a tree for you

----
the lexer


LPREN	: '(';
RPREN	: ')';
LBRACE	: '{';
RBRACE	: '}';
COMMA	: ',';
SEMI	: ';';

IDENT
  options {testLiterals=true;}
  : ('a'..'z'|'A'..'Z') ('a'..'z'|'A'..'Z'|'0'..'9')* ;

NUMBER options {testLiterals=true;}
  : ('0'..'9')+ ('.' ('0'..'9')*)? | '.' ('0'..'9')+;

STRING
 : '"' ( EscapeSequence | ~('\\'|'"') )* '"' ;
	
EscapeSequence
    	:   '\\' ('b'|'t'|'n'|'f'|'r'|'\"'|'\''|'\\') ;


----------

the parser

public_section
  :
   "public"^ IDENT LBRACE! (method )* RBRACE!
  ;

 method
   : "method"^  IDENT LPREN arguments RPREN
      LBRACE!
(var_decl)*
      RBRACE!
   ;

atom
  : INIT_VALUE
  | IDENT
  | STRING
  ;

arguments
  :  (atom (COMMA! atom)*)
  ;





On 7/14/06, kototama kototama <kototamo at gmail.com> wrote:
> Hi,
>
> Here is an extract of my grammar for a tiny programming language :
>
> public_section!: PUBLIC LBRACE v:var_decl_list m:method_def_list RBRACE
> {#public_section = #( [PUBLIC_SECTION, "public_section"],
> #([VAR_DECLS,"var_decls"], v) , #([METHOD_DEFS, "method_defs"], m) );}
> ;
>
> var_decl_list: (var_decl)*
> ;
>
> var_decl!: LET t:type i:id (ASSIGN v:value)? EOS
>       { #var_decl = #([VAR_DECL, "var_decl"], t, i, #([INIT_VALUE, "value"],
> v)); }
> ;
>
> I would like to simplify the public_section like this :
>
> public_section!: PUBLIC LBRACE (v:var_decl)* m:method_def_list RBRACE
>
> to avoid the definition of var_decl_list. Is it possible ? I don't find the
> correct way to build the tree ("var_decls" contains only the last definition
> if I do so).
>
> Thanks in advance for your help!
>