[antlr-interest] Newbie Help

[Mike Gering]

Jim,

Thanks for the suggestion. But 
programmatic_unit 
        : simple_name a b
        ;

a // line 12
        : (STAR simple_name )+ 
                (SLASH simple_name)*
        |       (SLASH simple_name)*
        ;

b 
        :
                ( (STAR) 
                        INT)?
        ;

simple_name 
        : NAME_FRAG 
        ((SPACE)? NAME_FRAG)*
        ;

Introduces additional warnings:
Foo.g:12: warning:nondeterminism between alts 1 and 2 of block upon
Foo.g:12:     k==1:STAR
Foo.g:12:     k==2:NAME_FRAG
Foo.g:13: warning:nondeterminism upon
Foo.g:13:     k==1:STAR
Foo.g:13:     k==2:NAME_FRAG
Foo.g:13:     between alt 1 and exit branch of block

And it doesn't express what I need. The grammar has to accept these 
examples:

a
a*b
a*b/c
a*b/c*2
a/c
a/c*2

This is a subset of a larger grammar, from DMTF DSP0004, that insists the 
programmatic units value consists of named multiplicative factors followed 
by named divided factors followed by constant multiplicative factors, e.g. 
"byte", "second * 250 * 10^-9", "foot * foot * foot / minute", "second * 
250 * 10^-9"

Mike
IBM
(919) 732-5020




From:
Jim Idle <jimi at temporal-wave.com>
To:

Cc:
antlr-interest at antlr.org
Date:
01/14/2009 01:39 PM
Subject:
Re: [antlr-interest] Newbie Help



Mike Gering wrote: 

Gavin, 

Thanks for the suggestion, but no value of k will work because the grammar 
accepts an optional list of tokens between (STAR simple_name)* and "b". 
For example: 
        x*x*x*y/y/y*z 
should be accepted. The series of slash terms can be arbitrarily long or 
absent. 
I think that you want:

a
         : (STAR simple_name )+ (SLASH simple_name)*
         | (SLASH simple_name)*
         ;

If you can use ANTLR 3.1 instead you will find this a lot easier.
Jim

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