From: Bart Schaefer <schaefer@brasslantern.com>
To: zsh-users@zsh.org
Subject: Re: suprise with -=
Date: Wed, 21 Oct 2015 11:46:53 -0700 [thread overview]
Message-ID: <151021114653.ZM2741@torch.brasslantern.com> (raw)
In-Reply-To: <5627D2F8.3000004@eastlink.ca>
On Oct 21, 11:01am, Ray Andrews wrote:
} Subject: Re: suprise with -=
}
} On 10/19/2015 05:27 PM, Bart Schaefer wrote:
} > The parser doesn't know that "first" is an integer, or even that it's
} > a variable that was previously declared.
} That puzzles me. Have not all your examples demonstrated that the
} parser is aware of the type of the variable and that it will perform
} it's operations accordingly?
No. Parser is syntax, not semantics. It knows "x=y" has a valid shape,
and to create code to invoke an assignment at run time, but not what the
assignment will do with x or y when run.
You can think of "third=first+second" as syntactic sugar for the command
"typeset third=first+second" -- it's the command that knows the type of
the variable, not the parser.
prev parent reply other threads:[~2015-10-21 18:47 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-19 5:46 Ray Andrews
2015-10-19 18:35 ` Bart Schaefer
2015-10-19 19:34 ` Ray Andrews
2015-10-20 0:27 ` Bart Schaefer
2015-10-21 2:55 ` Ray Andrews
2015-10-21 3:52 ` Bart Schaefer
2015-10-21 18:01 ` Ray Andrews
2015-10-21 18:43 ` ZyX
2015-10-22 15:29 ` Ray Andrews
2015-10-22 15:43 ` ZyX
2015-10-22 16:02 ` Ray Andrews
2015-10-22 23:56 ` Bart Schaefer
2015-10-23 7:34 ` Daniel Shahaf
2015-10-21 18:46 ` Bart Schaefer [this message]
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