Re: 2 Yacc Qs

Brian Bliss <brianb@microware.com>
27 Mar 1997 13:20:20 -0500

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Re: 2 Yacc Qs brianb@microware.com (Brian Bliss) (1997-03-27)
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From: Brian Bliss <brianb@microware.com>
Newsgroups: comp.compilers
Date: 27 Mar 1997 13:20:20 -0500
Organization: Microware Systems
References: 97-03-135
Keywords: yacc, parse, syntax

Barton Jaques wrote:
>
> I am building an expression grammar and having problems with associativity
> and shift/reduce conflicts. The language I am emulating permits a statement
> like this:
>
> set y to items 1 thru 2 of x as string
>
> which should be read as: "set y to (items 1 thru 2 of x) as string"
> and not as: "set y to items 1 thru 2 of (x as string)"
>
...
> expression:
> object_specifier
> | IDENT
> | expression AS class
>
...


try


  %left AS


this will cause the parser to reduce when it encounters a shift-reduce
conflict and AS is the input token, wereas


  %right AS


will cause the parser to shift (the default) when it encounters a shift-
reduce conflict and AS is the input token.


bb
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