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Re: [Bug-apl] Overbar not allowed in Gnu APL variable names but is in IS

From: Juergen Sauermann
Subject: Re: [Bug-apl] Overbar not allowed in Gnu APL variable names but is in ISO/IEC 13751:2000(E)
Date: Fri, 14 Feb 2014 16:41:24 +0100
User-agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130330 Thunderbird/17.0.5

Hi Fred,

I have added overbar to the characters allowed in variable names. see SVN 121.

I haven't seen ¯ in variable names either, but IBM APL2 supports them and
so do we now. Note that ∆ and ⍙ are also valid characters (even as first character) in names.

I would not use ⍺, ⍶, ⍵, and ⍹ because they have a special meaning in lambdas (aka. direct functions). and should not (but can) be used outside lambdas. Using them outside lambdas may affect portability.

/// Jürgen

On 02/11/2014 12:06 AM, Frederick H. Pitts wrote:
Gentle persons,

        On page 41 of ISO/IEC 13751:2000(E), the literal-identifier (which is
the same thing as a variable name) is defined to be composed of a letter
followed by zero or more letters, digits, underbars and overbars.  The
overbar is also used to distinguish negative numbers per the standards

        When I attempt to use the overbar in a variable name in Gnu APL, svn
116, a SYNTAX ERROR is reported.

        I have to admit I've never seen the overbar used in an APL variable
name.  On the other hand, having more symbols to chose from when one is
creating variable names is a plus for me.  I am pleased to find that the
standalone alpha and omega symbols can be used as variable name.



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