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Re: [Chicken-users] Handling unstandard reader macros.
From: |
Pupeno |
Subject: |
Re: [Chicken-users] Handling unstandard reader macros. |
Date: |
Wed, 23 Nov 2005 00:40:09 -0300 |
User-agent: |
KMail/1.8.3 |
On Tuesday 22 November 2005 03:26, felix winkelmann wrote:
> On 11/21/05, Pupeno <address@hidden> wrote:
> > > You only need to handle compiler-specifiic syntax, which is mainly
> > > #> ... <#-
> >
> > Why ? I already handle that and I already encountered cases where I'd
> > have to handle <<EOF and similar.
>
> The standard reader should handle #<<... by default.
In my case, it didn't, I even had to add support for #t and #f.
> > BTW, what should I return from my procedures that handle extensions. I
> > was returning '() but that causes an error, I am now returning
> > '(nevermind) since I don't care about it.
>
> Sorry, what kind of procedures are that?
The procedure that is set by set-read-syntax![1].
Thank you.
--
Pupeno <address@hidden> (http://pupeno.com)
[1] In my case:
(set-read-syntax! #\#
(lambda (port)
(let ((first-char (read-char port)))
;; (display (format "Found a reader macro starting with: ~s.~n"
first-char))
(cond
((char=? first-char #\>)
(let loop ((c (read-char port)))
;; (display (format "Retriving char: ~s.~n" c))
(if (and (char=? c #\<)
(char=? (peek-char port) #\#))
(begin
(read-char port)
'(nevermind))
(loop (read-char port)))))
((or (char=? first-char #\f)
(char=? first-char #\t))
'(nevermind))
(else
(with-output-to-port (current-error-port)
(lambda ()
(display "Non-supported reader macro extension found:")
(newline)(newline)
(display first-char)
(display (read-string 50 port))
(display " ...")
(newline)
(exit 1))))))))
pgponlwy40vBT.pgp
Description: PGP signature
- [Chicken-users] Handling unstandard reader macros., Pupeno, 2005/11/17
- Re: [Chicken-users] Handling unstandard reader macros., felix winkelmann, 2005/11/20
- Re: [Chicken-users] Handling unstandard reader macros., Pupeno, 2005/11/21
- Re: [Chicken-users] Handling unstandard reader macros., felix winkelmann, 2005/11/22
- Re: [Chicken-users] Handling unstandard reader macros.,
Pupeno <=
- Re: [Chicken-users] Handling unstandard reader macros., felix winkelmann, 2005/11/23
- Re: [Chicken-users] Handling unstandard reader macros., Pupeno, 2005/11/23
- Re: [Chicken-users] Handling unstandard reader macros., felix winkelmann, 2005/11/24
- Re: [Chicken-users] Handling unstandard reader macros., Pupeno, 2005/11/24
- Re: [Chicken-users] Handling unstandard reader macros., felix winkelmann, 2005/11/24
- Re: [Chicken-users] Handling unstandard reader macros., Zbigniew, 2005/11/24
- Re: [Chicken-users] Handling unstandard reader macros., Pupeno, 2005/11/24
- Re: [Chicken-users] Handling unstandard reader macros., Zbigniew, 2005/11/24
- Re: [Chicken-users] Handling unstandard reader macros., felix winkelmann, 2005/11/25
Re: [Chicken-users] Handling unstandard reader macros., Thomas Chust, 2005/11/17