GNU bug report logs - #26058
utf16->string and utf32->string don't conform to R6RS

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Package: guile; Reported by: taylanbayirli@HIDDEN ("Taylan Ulrich Bayırlı/Kammer"); dated Sat, 11 Mar 2017 12:14:01 UTC; Maintainer for guile is bug-guile@HIDDEN.

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From: Andy Wingo <wingo@HIDDEN>
To: taylanbayirli@HIDDEN (Taylan Ulrich =?utf-8?Q?=22Bay=C4=B1rl=C4=B1?=
 =?utf-8?Q?=2FKammer=22?=)
Subject: Re: bug#26058: utf16->string and utf32->string don't conform to R6RS
References: <87o9x83t0f.fsf@HIDDEN> <87shmhqqgd.fsf@HIDDEN>
 <87h92xyrmr.fsf@HIDDEN> <87bmt4rht1.fsf@HIDDEN>
 <87d1djzysb.fsf@HIDDEN>
Date: Tue, 14 Mar 2017 16:44:37 +0100
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 =?utf-8?Q?y=C4=B1rl=C4=B1=2FKammer=5C=22=22's?=
 message of "Tue, 14 Mar 2017 16:03:00 +0100")
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On Tue 14 Mar 2017 16:03, taylanbayirli@HIDDEN (Taylan Ulrich "Bay=C4=B1=
rl=C4=B1/Kammer") writes:

> Andy Wingo <wingo@HIDDEN> writes:
>
>> On Mon 13 Mar 2017 19:10, taylanbayirli@HIDDEN (Taylan Ulrich "Bay=C4=
=B1rl=C4=B1/Kammer") writes:
>>
>>> If I do binary I/O, the following situations are possible:
>>>
>>> 1. I'm guaranteed to get any possible bytes that happen to form a valid
>>>    BOM at the start of the stream as-is in the returned bytevector; the
>>>    binary I/O interface doesn't see such bytes as anything special, as
>>>    it could simply be coincidence that the stream starts with such
>>>    bytes.
>>
>> (1).  But I thought this bug was about using a bytevector as a source
>> and then doing textual I/O on it, no?
>
> I have a feeling we're somehow talking past each other. :-) As far as
> I'm concerned, the bug is just that the procedures don't conform to the
> specification.
>
> It would of course be good if the behavior of these procedures was
> somehow in harmony with the behavior of I/O operations, but I don't see
> any issues arising from adopting the R6RS behavior of the procedures
> utf16->string and utf32->string.  Do you?

Adopting the behavior is more or less fine.  If it can be done while
relying on the existing behavior, that is better than something ad-hoc
in a module.

Andy




Information forwarded to bug-guile@HIDDEN:
bug#26058; Package guile. Full text available.

Message received at 26058 <at> debbugs.gnu.org:


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From: taylanbayirli@HIDDEN (Taylan Ulrich =?utf-8?Q?Bay=C4=B1rl=C4=B1?=
 =?utf-8?Q?=2FKammer?=)
To: Andy Wingo <wingo@HIDDEN>
Subject: Re: bug#26058: utf16->string and utf32->string don't conform to R6RS
References: <87o9x83t0f.fsf@HIDDEN> <87shmhqqgd.fsf@HIDDEN>
 <87h92xyrmr.fsf@HIDDEN> <87bmt4rht1.fsf@HIDDEN>
Date: Tue, 14 Mar 2017 16:03:00 +0100
In-Reply-To: <87bmt4rht1.fsf@HIDDEN> (Andy Wingo's message of "Mon, 13 Mar
 2017 22:24:42 +0100")
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Andy Wingo <wingo@HIDDEN> writes:

> On Mon 13 Mar 2017 19:10, taylanbayirli@HIDDEN (Taylan Ulrich "Bay=C4=
=B1rl=C4=B1/Kammer") writes:
>
>> If I do binary I/O, the following situations are possible:
>>
>> 1. I'm guaranteed to get any possible bytes that happen to form a valid
>>    BOM at the start of the stream as-is in the returned bytevector; the
>>    binary I/O interface doesn't see such bytes as anything special, as
>>    it could simply be coincidence that the stream starts with such
>>    bytes.
>
> (1).  But I thought this bug was about using a bytevector as a source
> and then doing textual I/O on it, no?

I have a feeling we're somehow talking past each other. :-) As far as
I'm concerned, the bug is just that the procedures don't conform to the
specification.

It would of course be good if the behavior of these procedures was
somehow in harmony with the behavior of I/O operations, but I don't see
any issues arising from adopting the R6RS behavior of the procedures
utf16->string and utf32->string.  Do you?

Taylan




Information forwarded to bug-guile@HIDDEN:
bug#26058; Package guile. Full text available.

Message received at 26058 <at> debbugs.gnu.org:


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From: Andy Wingo <wingo@HIDDEN>
To: taylanbayirli@HIDDEN (Taylan Ulrich =?utf-8?Q?=22Bay=C4=B1rl=C4=B1?=
 =?utf-8?Q?=2FKammer=22?=)
Subject: Re: bug#26058: utf16->string and utf32->string don't conform to R6RS
References: <87o9x83t0f.fsf@HIDDEN> <87shmhqqgd.fsf@HIDDEN>
 <87h92xyrmr.fsf@HIDDEN>
Date: Mon, 13 Mar 2017 22:24:42 +0100
In-Reply-To: <87h92xyrmr.fsf@HIDDEN> ("Taylan Ulrich =?utf-8?Q?=5C=22Ba?=
 =?utf-8?Q?y=C4=B1rl=C4=B1=2FKammer=5C=22=22's?=
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On Mon 13 Mar 2017 19:10, taylanbayirli@HIDDEN (Taylan Ulrich "Bay=C4=B1=
rl=C4=B1/Kammer") writes:

> If I do binary I/O, the following situations are possible:
>
> 1. I'm guaranteed to get any possible bytes that happen to form a valid
>    BOM at the start of the stream as-is in the returned bytevector; the
>    binary I/O interface doesn't see such bytes as anything special, as
>    it could simply be coincidence that the stream starts with such
>    bytes.
>
> 2. I'm guaranteed *not* to get bytes that form a BOM at the start of the
>    stream; instead they're consumed to set the port encoding for any
>    future text I/O.
>
> 3. The behavior is unspecified and either of the above may happen.

(1).  But I thought this bug was about using a bytevector as a source
and then doing textual I/O on it, no?

Andy




Information forwarded to bug-guile@HIDDEN:
bug#26058; Package guile. Full text available.

Message received at 26058 <at> debbugs.gnu.org:


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From: taylanbayirli@HIDDEN (Taylan Ulrich =?utf-8?Q?Bay=C4=B1rl=C4=B1?=
 =?utf-8?Q?=2FKammer?=)
To: Andy Wingo <wingo@HIDDEN>
Subject: Re: bug#26058: utf16->string and utf32->string don't conform to R6RS
References: <87o9x83t0f.fsf@HIDDEN> <87shmhqqgd.fsf@HIDDEN>
Date: Mon, 13 Mar 2017 19:10:36 +0100
In-Reply-To: <87shmhqqgd.fsf@HIDDEN> (Andy Wingo's message of "Mon, 13 Mar
 2017 14:03:14 +0100")
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Andy Wingo <wingo@HIDDEN> writes:

> Hi,
>
> this is a tricky area that is not so amenable to quick patches :) Have
> you looked into what Guile already does for byte-order marks?  Can you
> explain how the R6RS specification relates to this?
>
>   https://www.gnu.org/software/guile/manual/html_node/BOM-Handling.html
>
> Andy

Hmm, interesting.  I noticed the utf{16,32}->string procedures ignoring
a BOM at the start of the given bytevector, but didn't look at it from a
ports perspective.

TL;DR of the below though: the R6RS semantics offer a strict enrichment
of the feature-set of the utfX->string procedures relative to the Guile
semantics, so at most we would end up with spurious features.  (The
optional ability to handle any possible BOM at the start of the
bytevector, with a fall-back endianness in case none is found.)


That said, let's see...

If I do a textual read from a port, I already get a string and not a
bytevector, so the behavior of utfX->string operations is irrelevant.

If I do binary I/O, the following situations are possible:

1. I'm guaranteed to get any possible bytes that happen to form a valid
   BOM at the start of the stream as-is in the returned bytevector; the
   binary I/O interface doesn't see such bytes as anything special, as
   it could simply be coincidence that the stream starts with such
   bytes.

2. I'm guaranteed *not* to get bytes that form a BOM at the start of the
   stream; instead they're consumed to set the port encoding for any
   future text I/O.

3. The behavior is unspecified and either of the above may happen.

In the case of #1, it's probably good for utfX->string procedures to be
able to handle BOMs, but also allow explicitly ignoring any possible
BOM.  The R6RS semantics cover this.

In the case of #2, the utfX->string procedures don't need to be able to
handle BOMs as far as we're talking about passing them bytevectors
returned by port I/O, but it also doesn't hurt if they optionally
support it.  The R6RS semantics are fine here as well I think.

As for #3... first of all it's bad IMO; the behavior ought to be
specified. :-) But in any case, the additional features of the R6RS
semantics won't hurt.

WDYT?  As far as I understand the page you linked, Guile currently
implements #3, which I think is unfortunate but can kinda understand
too.  In any case, the additional R6RS features won't hurt, right?

Taylan




Information forwarded to bug-guile@HIDDEN:
bug#26058; Package guile. Full text available.

Message received at 26058 <at> debbugs.gnu.org:


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To: taylanbayirli@HIDDEN ("Taylan Ulrich =?utf-8?Q?=22Bay=C4=B1rl=C4=B1?=
 =?utf-8?Q?=2FKammer=22=22?=)
Subject: Re: bug#26058: utf16->string and utf32->string don't conform to R6RS
References: <87o9x83t0f.fsf@HIDDEN>
Date: Mon, 13 Mar 2017 14:03:14 +0100
In-Reply-To: <87o9x83t0f.fsf@HIDDEN> ("\"Taylan Ulrich
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On Sat 11 Mar 2017 13:19, taylanbayirli@HIDDEN ("Taylan Ulrich "Bay=C4=
=B1rl=C4=B1/Kammer"") writes:

> See the R6RS Libraries document page 10.  The differences:
>
> - R6RS supports reading a BOM.
>
> - R6RS mandates an endianness argument to specify the behavior at the
>   absence of a BOM.
>
> - R6RS allows an optional third argument 'endianness-mandatory' to
>   explicitly ignore any possible BOM.
>
> Here's a quick patch on top of master.  I didn't test it thoroughly...

Hi,

this is a tricky area that is not so amenable to quick patches :) Have
you looked into what Guile already does for byte-order marks?  Can you
explain how the R6RS specification relates to this?

  https://www.gnu.org/software/guile/manual/html_node/BOM-Handling.html

Andy




Information forwarded to bug-guile@HIDDEN:
bug#26058; Package guile. Full text available.

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Subject: utf16->string and utf32->string don't conform to R6RS
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See the R6RS Libraries document page 10.  The differences:

- R6RS supports reading a BOM.

- R6RS mandates an endianness argument to specify the behavior at the
  absence of a BOM.

- R6RS allows an optional third argument 'endianness-mandatory' to
  explicitly ignore any possible BOM.

Here's a quick patch on top of master.  I didn't test it thoroughly...


===File
/home/taylan/src/guile/guile-master/0001-Fix-R6RS-utf16-string-and-utf32-string.patch===
From f51cd1d4884caafb1ed0072cd77c0e3145f34576 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Taylan=20Ulrich=20Bay=C4=B1rl=C4=B1/Kammer?=
 <taylanbayirli@HIDDEN>
Date: Fri, 10 Mar 2017 22:36:55 +0100
Subject: [PATCH] Fix R6RS utf16->string and utf32->string.

* module/rnrs/bytevectors.scm (read-bom16, read-bom32): New procedures.
(r6rs-utf16->string, r6rs-utf32->string): Ditto.
---
 module/rnrs/bytevectors.scm | 52 ++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 51 insertions(+), 1 deletion(-)

diff --git a/module/rnrs/bytevectors.scm b/module/rnrs/bytevectors.scm
index 9744359f0..997a8c9cb 100644
--- a/module/rnrs/bytevectors.scm
+++ b/module/rnrs/bytevectors.scm
@@ -69,7 +69,9 @@
            bytevector-ieee-double-native-set!
 
            string->utf8 string->utf16 string->utf32
-           utf8->string utf16->string utf32->string))
+           utf8->string
+           (r6rs-utf16->string . utf16->string)
+           (r6rs-utf32->string . utf32->string)))
 
 
 (load-extension (string-append "libguile-" (effective-version))
@@ -80,4 +82,52 @@
       `(quote ,sym)
       (error "unsupported endianness" sym)))
 
+(define (read-bom16 bv)
+  (let ((c0 (bytevector-u8-ref bv 0))
+        (c1 (bytevector-u8-ref bv 1)))
+    (cond
+     ((and (= c0 #xFE) (= c1 #xFF))
+      'big)
+     ((and (= c0 #xFF) (= c1 #xFE))
+      'little)
+     (else
+      #f))))
+
+(define r6rs-utf16->string
+  (case-lambda
+    ((bv default-endianness)
+     (let ((bom-endianness (read-bom16 bv)))
+       (if (not bom-endianness)
+           (utf16->string bv default-endianness)
+           (substring/shared (utf16->string bv bom-endianness) 1))))
+    ((bv endianness endianness-mandatory?)
+     (if endianness-mandatory?
+         (utf16->string bv endianness)
+         (r6rs-utf16->string bv endianness)))))
+
+(define (read-bom32 bv)
+  (let ((c0 (bytevector-u8-ref bv 0))
+        (c1 (bytevector-u8-ref bv 1))
+        (c2 (bytevector-u8-ref bv 2))
+        (c3 (bytevector-u8-ref bv 3)))
+    (cond
+     ((and (= c0 #x00) (= c1 #x00) (= c2 #xFE) (= c3 #xFF))
+      'big)
+     ((and (= c0 #xFF) (= c1 #xFE) (= c2 #x00) (= c3 #x00))
+      'little)
+     (else
+      #f))))
+
+(define r6rs-utf32->string
+  (case-lambda
+    ((bv default-endianness)
+     (let ((bom-endianness (read-bom32 bv)))
+       (if (not bom-endianness)
+           (utf32->string bv default-endianness)
+           (substring/shared (utf32->string bv bom-endianness) 1))))
+    ((bv endianness endianness-mandatory?)
+     (if endianness-mandatory?
+         (utf32->string bv endianness)
+         (r6rs-utf32->string bv endianness)))))
+
 ;;; bytevector.scm ends here
-- 
2.11.0

============================================================




Acknowledgement sent to taylanbayirli@HIDDEN ("Taylan Ulrich Bayırlı/Kammer"):
New bug report received and forwarded. Copy sent to bug-guile@HIDDEN. Full text available.
Report forwarded to bug-guile@HIDDEN:
bug#26058; Package guile. Full text available.
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