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From: dcj@decvax.DEC.COM (Dave Jedlinsky)
Newsgroups: comp.lang.postscript
Subject: Re: A question about //add
Message-ID: <17218@shlump.nac.dec.com>
Date: 13 Nov 90 19:16:06 GMT
References: <321@heaven.woodside.ca.us>
Sender: news@shlump.nac.dec.com
Reply-To: dcj@decvax.DEC.COM (Dave Jedlinsky)
Organization: Ultrix Engineering Group
Lines: 36

-- 
/* Eat this, line-eater! */

Here's another data point.

The Display Postscript X server (Adobe) for Ultrix 4.0 has the
following behaviour:

	PS>version ==
	(1006.5)
	PS>1 2 //add pstack clear
	3
	PS>1 2 /add load pstack clear
	--add--
	2
	1
	PS>{1 2 //add} pstack clear
	{1 2 --add--}
	PS>

I agree that this is inconsistent with the "PostScript Language
Supplement" from Adobe, dated January 9, 1986, page 3:

	"The substitution occurs immediately, regardless of
	whether or not the token appears inside an executable
	array delimited by '{...}'.  Note that this process is
	a substitution and not an execution; that is, the name's
	value is not executed but rather is substituted for the
	name itself, just as if the load operator had been applied
	to the name."


-David Jedlinsky
Digital Equipment Corporation   | 
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