[antlr-interest] Help with Antlr

[Sharon Li]

Hi I seem to be running into problems with Antlr, so could some kind souls out there pls help. 

My program needs to read a file that looks something like that :

/*--------Begining of file ----------------------------------*/

#define DURATION 100
#define MAX_INT_LEN 10
#define MAX_P_LEN 2
Lsystem: 0 
/* number of steps in the simulation */
derivation length: 100
/* starting string or axiom */
/* I is an internode with parameter age,
 * L is a leaf, 
 * B is a blossom,
 * P is a petal with parameter age
 */
Axiom: I(1)[L]/(180)[L]I(1)I(1)I(1)B
I(age)-->I(age+1)
P(age)-->P(age+1)
R(ang)-->R(ang+3)
Decomposition
B --> R(1);(3)@o(1.5);(1)[P(1)]+(72)[P(1)]+(72)[P(1)]+(72)[P(1)]+(72)[P(1)]
Homomorphism
I(age)-->;(2)F(MAX_INT_LEN*func(1,age/DURATION))
L --> +(60);(4)F(1){.g(1)[-(90)g(1).][g(2).][+(90)g(1).]}
P(age) --> {.g(1)[-(90)g(1).][g(MAX_P_LEN*func(2,age/DURATION)).][+(90)g(1).]} 
R(ang)--> +(ang)
/* Label for end of L-system */
endlsystem

/*----------- ENd of file -------------------------------------*/

"#define DURATION 100" declares a variable identifier DURATION and assigns a literal 100 to it. This value will be stored and substituted into:

P(age) --> {.g(1)[-(90)g(1).][g(MAX_P_LEN*func(2,age/DURATION)).][+(90)g(1).]} 

The program should return me the substituted string. 

My codes are as follow:

class LfileParser extends Parser;

options { k=2; }
{
 LsystemFile file = new LsystemFile();
 
 public LsystemFile getLsystemFile(){
  return file;
 }
}

declaration
 : ((HEX)+ "define" (id:IDENT) (id2:IDENT))
  { 
   String attr = id.getText();
   String value = id2.getText();
   System.out.println("#define "+attr+" "+value); 
   file.declare(attr, value);
  } 
  ;

derivationLength
 : "derivation length" COLON (d : DIGIT)*
 { System.out.println("derivation length : "+d); } ;

lSystem
 : "LSystem" COLON (d : DIGIT)*
 ;

expr: IDENT
  | LPAREN expr RPAREN
  | LBRACK expr RBRACK
  | LCURLY expr RCURLY
  ;

axiom : "Axiom" "-->" (expr)
   ;
   
assign : expr "-->" (expr);

file   : ( line (NEWLINE line)*(NEWLINE)? EOF)
       {System.out.println("file matched");}
       ;

line   : ((record)+ )
       ;
    
record : (declaration)* (lSystem) (derivationLength) (axiom) (assign)* "Decomposition" (assign)* "Homomorphism" (assign)* "endlsystem"
    ;     

/********************************************* Lexer class *************************************************************************************/

class LfileLexer extends Lexer;

options{charVocabulary='\3'..'\377';}
      
protected LETTER : ( 'a'..'z' | 'A'..'Z' )+; 
protected DIGIT : ('0'..'9')+ ;
protected SYMBOL : ('.'|','|';'|'_') ;

IDENT : (LETTER | DIGIT | SYMBOL);

LPAREN   : '('  ;
RPAREN   : ')'  ;
LBRACK   : '['  ;
RBRACK   : ']'  ;
LCURLY   : '{'  ;
RCURLY   : '}'  ;
HEX     : '#'  ;
COLON    : ':'  ;

COMMENT : "/*" (options {greedy=false;} :.)* "*/" ;

NEWLINE : ('\r''\n')=> '\r''\n' //DOS
        | '\r'                  //MAC
        | '\n'                  //UNIX
        { newline(); }
        ;
    
WS      : (' '|'\t') { $setType(Token.SKIP); } ;

I'm actually pretty lost and help is very much appreciated. 
P.S thanks to those who have helped me with it.

 Yahoo! Travel
- Valentine surprise deals. Book now!
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.antlr.org/pipermail/antlr-interest/attachments/20030129/7d724551/attachment.html