[antlr-interest] Re: multiple slashes

[William Lam]

whoops didn't specify the grammar correctly 

expression
    :     ( alpha ( DOT alpha )? | delimited_identifier DOT alpha )
               (DIVIDE (alpha ( DOT alpha )? | delimited_identifier 
DOT alpha))*
    ;

in my lexer I have a rule

identifier
    :    alpha
    |    delimited_identifier
    ;

divide
    :    '/' ( {_ttype=delimited_identifier } alpha ( '/' alpha )* )?
    ;

alpha options { testLiterals=true; }
   :    'a' .. 'z' ( 'a' .. 'z' | '0' .. '9' | '_' | '$' | '#' )*
   ;
these rules can match

/a/b//c    <---- /a/b divided by /c

but cannot match simple examples such as a/b

any ideas?

wil

--- In antlr-interest at yahoogroups.com, "William Lam" <xeenman at y...> 
wrote:
> Hi all,
> 
> I need to parse a language that treats forward slash '/' as both a 
> delimiter and as the divide character.
> 
> identifiers can be standalone or have the forward slash joining 
them 
> together
> 
> foo
> 
> or
> 
> /foo/bar/car
> 
> so we can have instances of
> 
> /foo/bar/car.zoo/a     <---- z/foo/bar/car.oo is being divided by a
> 
> or
> 
> foo/bar          <---------- foo divided by bar
> 
> or
> 
> a//foo/bar/car.zoo  <------- a divided by /foo/bar/car.zoo
> 
> in my grammar i have a rule
> 
> expression
>     :    identifier ( DIVIDE identifier)
>     ;
> 
> in my lexer I have a rule
> 
> identifier
>     :    alpha
>     |    delimited_identifier
>     ;
> 
> divide
>     :    '/' ( {_ttype=delimited_identifier } alpha ( '/' alpha )
* )?
>     ;
> 
> alpha options { testLiterals=true; }
>    :    'a' .. 'z' ( 'a' .. 'z' | '0' .. '9' | '_' | '$' | '#' )*
>    ;
> these rules can match
> 
> /a/b//c    <---- /a/b divided by /c
> 
> but cannot match simple examples such as a/b
> 
> any ideas?
> 
> wil



 
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