Hi!
Can you help me? I have to write a Ruby Editor + Parser with Java
Language.
I use ANTLR Parser Generator.
The grammar (a little part of Ruby grammar) I use is my hands made. I
had use ANTLR and I had write a main in Java Project. Now the problem
is: if I write a correct ruby code or not correct ruby code the result
is the same. Therefore I had think the problem is on the grammar.
Please, can you validate my Grammar. For me it's correct, but I think
the problem is this for my project.
This is the file.g how I had write my Grammar for ANTLR.
class P extends Parser;
options {
k = 2; // pone a 2 il lookahead di token
exportVocab=Ruby; // chiama il suo vocabolario "Ruby"
defaultErrorHandler = false; // non genera gestori di errori di
parser
buildAST=true; // il parser costruisce un AST (Abstract Syntax
Tree)
}
// l'intera classe
program : (CLASS IDENTIFIER body_class)*;
// il corpo della classe
body_class : (DEF (IDENTIFIER)* body)*;
// il corpo
body : (statement)+;
// istruzioni che si possono trovare nel corpo del programma
statement : (IF | WHILE) condition
> LOOP_DO
> YIELD LPAREN IDENTIFIER RPAREN
> RETURN ret
> END
> IDENTIFIER ASSIGN (LPAREN)+ (IDENTIFIER | NUMBER | STRING)
(RPAREN)+
> IDENTIFIER ASSIGN (LPAREN)+ IDENTIFIER (RPAREN)+
> IDENTIFIER ASSIGN (LPAREN)+ instruction (RPAREN)+;
// condizioni dei costrutti
condition : (LPAREN)+ IDENTIFIER booleano IDENTIFIER (RPAREN)+
> (LPAREN)+ IDENTIFIER booleano NUMBER (RPAREN)+
> (LPAREN)+ NUMBER booleano IDENTIFIER (RPAREN)+
> (LPAREN)+ NUMBER booleano NUMBER (RPAREN)+
> (LPAREN)+ instruction (RPAREN)+
> IDENTIFIER booleano (LPAREN)+ instruction (RPAREN)+;
instruction : NUMBER operator NUMBER
> IDENTIFIER operator NUMBER
> NUMBER operator IDENTIFIER;
// operatori che si possono trovare nelle condizioni
booleano : LT
> LE
> GE
> GT
> EGUAL
> MOD
> AND
> OR
> LPAREN
> RPAREN
> DIV;
// ciò che può essere scritto dopo il "return"
ret : (LPAREN)+ IDENTIFIER (RPAREN)+
> (LPAREN)+ NUMBER (RPAREN)+
> (LPAREN)+ TRUE (RPAREN)+
> (LPAREN)+ FALSE (RPAREN)+;
operator : DIV
> MUL
> PLUS
> SUB
> MOD;
//------------------------------------------------------------------------------
// LEXER
//------------------------------------------------------------------------------
class RubyLexer extends Lexer;
options {
charVocabulary = '\0'..'\377';
exportVocab=Ruby; // chiama il suo vocabolario "Ruby"
testLiterals = false; // don't automatically test for literals
k = 4; // four characters of lookahead
caseSensitive = true;
caseSensitiveLiterals = false;
filter = true;
}
tokens {
CLASS = "class";
DEF = "def";
IF = "if";
RETURN = "return";
END = "end";
LOOP_DO = "loop do";
YIELD = "yield";
DO = "do";
FALSE = "false";
TRUE = "true";
}
// Operatori
LT : '<';
LE : "<=";
GE : ">=";
GT : '>';
EGUAL : "==";
DIV : '/';
MUL : '*';
ASSIGN : '=';
LPAREN : '(';
RPAREN : ')';
PLUS : '+';
POINT : '.';
AT : '@';
OR : '|'; // questo simbolo non ha solo la funzionalità
dell'OR!
AND : '&';
SUB : '-';
MOD : '%';
NUMBER : ('0'..'9')+;
// Identificatori
IDENTIFIER : ('a'..'z'|'A'..'Z')+ (NUMBER)?;
// Stringhe
STRING : '"' (('a'..'z'|'A'..'Z')+)* '"'
> '\'' (('a'..'z'|'A'..'Z')+)* '\'';
// regola per il ritorno a capo
NEWLINE : ( "\r\n" // DOS
> '\r' // MAC
> '\n' // Unix
);
If you can help me for me it's very important.
Thank you very much!
bye,
puellula
