From: Paul Rubin <no.email@nospam.invalid>
Subject: Re: Proliferation of Reserved Words
Date: Tue, 01 Jun 2021 00:40:50 -0700 [thread overview]
Message-ID: <87bl8qf2wt.fsf@nightsong.com> (raw)
In-Reply-To: s94i2o$5hl$1@franka.jacob-sparre.dk
"Randy Brukardt" <randy@rrsoftware.com> writes:
> At least twice it was proposed that Ada have "keywords", identifiers with
> special meaning in the syntax but that were not reserved.
I remember this as a fundamental decision of PL/I that made PL/I quite
hard to parse using the automata-based methods developed not long
afterwards. I don't know what consequences that had for PL/I or
anything else, if any. But I think it was retrospectively considered a
mistake. It's a lot easier to separate parsing and scanning if you can
have reserved words.
OTOH I know that C compilers sometimes (usually?) handle typedefs by
having the parser tell the scanner to treat the typedef name as
keyword-like, after it sees that a typedef has been defined.
next prev parent reply other threads:[~2021-06-01 7:40 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-31 20:51 Proliferation of Reserved Words Jeffrey R. Carter
2021-05-31 21:27 ` Dmitry A. Kazakov
2021-06-01 5:54 ` Randy Brukardt
2021-06-01 7:40 ` Paul Rubin [this message]
2021-06-03 8:48 ` Robin Vowels
2021-06-01 9:51 ` Jeffrey R. Carter
2021-06-01 16:06 ` Simon Wright
2021-06-01 11:48 ` Luke A. Guest
2021-06-02 18:13 ` AdaMagica
2021-06-02 19:21 ` Dmitry A. Kazakov
2021-06-02 20:13 ` Chris Townley
2021-06-02 20:18 ` Jeffrey R. Carter
2021-06-02 23:23 ` Bill Findlay
2021-06-03 23:58 ` Keith Thompson
2021-06-04 6:58 ` Dmitry A. Kazakov
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