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[Chicken-janitors] Re: #562: Chicken reader does not maintain quotes on
From: |
Chicken Trac |
Subject: |
[Chicken-janitors] Re: #562: Chicken reader does not maintain quotes on |#:| (was: chicken-doc does not properly index #:) |
Date: |
Sat, 09 Apr 2011 00:12:03 -0000 |
#562: Chicken reader does not maintain quotes on |#:|
-----------------------------+----------------------------------------------
Reporter: zbigniew | Owner: felix
Type: defect | Status: assigned
Priority: major | Milestone: 4.7.0
Component: core libraries | Version: 4.6.x
Resolution: | Keywords: the colossal colon caper
-----------------------------+----------------------------------------------
Changes (by zbigniew):
* owner: zbigniew => felix
* status: new => assigned
* component: extensions => core libraries
Old description:
> The node (chicken read-syntax #:) is not properly indexed. It can be
> accessed directly but not via the index, because the index entry looks
> like (: (chicken read-syntax)) instead of (|#:| (chicken read-syntax)).
>
> Cause not immediately obvious, read-write invariant is preserved with
> symbol |#:|.
>
> Indirectly reported by mario.
New description:
string->symbol on |#:| works, but reading it does not. See comment below.
This causes node (chicken read-syntax #:) to be not properly indexed. It
can be accessed directly but not via the index, because the index entry
looks like (: (chicken read-syntax)) instead of (|#:| (chicken read-
syntax)). Although it is written out correctly initially, once the index
goes through a read/modify/write cycle (on a different symbol) the |#:|
becomes #: and then eventually :.
Indirectly noticed by mario.
--
Comment:
This is a bug in core. string->symbol on |#:| works, but reading it does
not. It works fine for other symbols, such as |#?|. This appears to be a
bug in the reader not the writer.
{{{
#;7> (string->symbol "#:")
; => |#:|
(with-input-from-string "((|#:|))" read)
; => ((#:))
#;4> '((|#:|))
; => ((#:))
#;5> '|#:|
; => #:
#;12> (write '|#:|)
; => #:
#;13> (write (string->symbol "#:"))
; => |#:|
(with-input-from-string "((|#?|))" read)
; => ((|#?|))
#;6> '|#?|
; => |#?|
}}}
--
Ticket URL: <http://bugs.call-cc.org/ticket/562#comment:2>
Chicken Scheme <http://www.call-with-current-continuation.org/>
Chicken Scheme is a compiler for the Scheme programming language.
- [Chicken-janitors] #562: chicken-doc does not properly index #:, Chicken Trac, 2011/04/08
- [Chicken-janitors] Re: #562: chicken-doc does not properly index #:, Chicken Trac, 2011/04/08
- [Chicken-janitors] Re: #562: Chicken reader does not maintain quotes on |#:| (was: chicken-doc does not properly index #:),
Chicken Trac <=
- [Chicken-janitors] Re: #562: Chicken reader does not maintain quotes on |#:|, Chicken Trac, 2011/04/11
- [Chicken-janitors] Re: #562: Chicken reader does not maintain quotes on |#:|, Chicken Trac, 2011/04/11
- [Chicken-janitors] Re: #562: Chicken reader does not maintain quotes on |#:|, Chicken Trac, 2011/04/11
- [Chicken-janitors] Re: #562: Chicken reader does not maintain quotes on |#:|, Chicken Trac, 2011/04/11
- [Chicken-janitors] Re: #562: Chicken reader does not maintain quotes on |#:|, Chicken Trac, 2011/04/11
- Re: [Chicken-janitors] #562: Chicken reader does not maintain quotes on |#:|, Chicken Trac, 2011/04/11
- Re: [Chicken-janitors] #562: Chicken reader does not maintain quotes on |#:|, Chicken Trac, 2011/04/11
- Re: [Chicken-janitors] #562: Chicken reader does not maintain quotes on |#:|, Chicken Trac, 2011/04/12
- Re: [Chicken-janitors] #562: Chicken reader does not maintain quotes on |#:|, Chicken Trac, 2011/04/12