[antlr-interest] Please advice about float

[denis, alexis]

Hi,
 
I'm no expert in grammars but I'd say a float is an (INT'.'INT) and a NUMBER
is a FLOAT or an INT.
 
Alexis

-----Original Message-----
From: Gevik babakhani [mailto:gevik at xs4all.nl]
Sent: Monday, September 19, 2005 9:07 AM
To: antlr-interest at antlr.org
Subject: [antlr-interest] Please advice about float



Dear all,

 

I would like to parse integers and simple floats without exponents. Is this
the correct grammar?

 

class MyLexer extends Lexer;

options {

            k=2;

}

                                                                        

NUMBER          :           INT ((FLOAT)?)

                        ;

protected

FLOAT              : ('.' INT)

                        ;

protected

INT                   :           (DIGIT)+

                        ;

 


protected                                               

DIGIT                :           '0'..'9'

                        ;

 

WS     :

    (' ' 

    | '\t' 

    | '\r' '\n' { newline(); } 

    | '\n'      { newline(); }

    ) 

    { $setType(Token.SKIP); } 

  ;


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