Re: Keywords and Reserved Words

gah4 <gah4@u.washington.edu>
Wed, 9 Mar 2022 00:31:25 -0800 (PST)

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From: gah4 <gah4@u.washington.edu>
Newsgroups: comp.compilers
Date: Wed, 9 Mar 2022 00:31:25 -0800 (PST)
Organization: Compilers Central
References: 22-03-004 22-03-009 22-03-015 22-03-016 22-03-017
Injection-Info: gal.iecc.com; posting-host="news.iecc.com:2001:470:1f07:1126:0:676f:7373:6970"; logging-data="88054"; mail-complaints-to="abuse@iecc.com"
Keywords: parse, Fortran
Posted-Date: 09 Mar 2022 15:20:16 EST
In-Reply-To: 22-03-017

(snip, our moderator wrote)


> [If anyone wants to know how to find the tokens in old space-insensitive Fortran
> I can tell you, but it's as ugly as you might imagine. -John]


As well as I know, the original 704 Fortran compiler has been lost to history,
but the Fortran II compiler is still around.


Note, though, that fixed-form is still in the Fortran standard, and still has the
space-insensitivity. More popular for new programs, free-form is not space
insensitive.


Also, to make it easier for programmers, some space is still optional in
free-form Fortran, for old and new keywords. For example, both GO TO
and GOTO are allowed, I suspect with separate entries into the parsing
tables. PL/I also has both GO TO and GOTO statements.

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