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Re: lex function for values

From: John Darrington
Subject: Re: lex function for values
Date: Sat, 23 May 2009 07:17:11 +0800
User-agent: Mutt/1.5.18 (2008-05-17)

On Fri, May 22, 2009 at 08:03:36AM -0700, Ben Pfaff wrote:
     John Darrington <address@hidden> writes:
     > It struck me that the value-rep branch would lend itself to a function
     > of the form:
     > bool lex_match_value (struct lexer* , union value *);
     > which would be useful for matching either a string or a number.
     (A width would also need to be passed in.)

The width could be infered from the length of the string. Although
typically, the width would have to match a variable which has already
been parsed.
     Is this useful very often?

Enough to make it worthwhile I think.  We currently have something
like this in t-test.q (for the grouping variable).  Similarly, I can
envisage that any procedure where grouping or categorical values are
involved, particularly dichotomous ones might need this.


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