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Posted to commits@daffodil.apache.org by "Mike Beckerle (Jira)" <ji...@apache.org> on 2019/12/11 13:27:00 UTC
[jira] [Commented] (DAFFODIL-2218) ICU behavior incompatible -
textNumberCheckPolicy lax is lax about "+" signs. Was not before.
[ https://issues.apache.org/jira/browse/DAFFODIL-2218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16993530#comment-16993530 ]
Mike Beckerle commented on DAFFODIL-2218:
-----------------------------------------
IBM Submitted this change of behavior as an ICU bug report. The response from the ICU team, suggests not fixing it, working as designed, as lax behavior is not specified tightly by the relevant standard: UTS 35 from the Unicode Consortium.
https://unicode-org.atlassian.net/browse/ICU-20896
> ICU behavior incompatible - textNumberCheckPolicy lax is lax about "+" signs. Was not before.
> ----------------------------------------------------------------------------------------------
>
> Key: DAFFODIL-2218
> URL: https://issues.apache.org/jira/browse/DAFFODIL-2218
> Project: Daffodil
> Issue Type: Bug
> Components: Back End, ICU, Libraries
> Reporter: Mike Beckerle
> Priority: Minor
> Fix For: 2.5.0
>
>
> ICU libraries changed behavior and now strict behavior is being lax about + signs.
> Daffodil should revert back to the latest ICU version that doesn't have this problem.
> Likely we have to determine what ICU version this changed in, and back out to a prior one, as this new behavior is not implementing the DFDL spec behavior.
> See also https://issues.apache.org/jira/browse/DAFFODIL-845
> This from a DFDL Workgroup email thread on this subject:
> {code:java}
> Re: [DFDL-WG] Action 313: Plus '+' sign and lax textNumberCheckPolicyInboxxSteve Hanson <sm...@uk.ibm.com> Fri, Aug 30, 10:56 AMto me, slawrence, DFDL-WG, Liam ICU changing behaviour in an incompatible
> way is not good.
> IBM DFDL is way behind, and is still
> on ICU 51.2. We are limited in what we can do as we try to keep the
> same level as IBM Integration Bus & WTX as we have had C namespacing
> issues in the past.
> Looking at the links, there are other
> changes that have crept in when lenient.
> - The string must
> contain a complete prefix and suffix.
> For example, if the pattern is "{#};(#)", then
> "{123}" or "(123)" would match, but "{123",
> "123}", and "123" would all fail.
> (The latter strings would be accepted in lenient mode.)
> -
> Minus and plus signs can only appear if specified in the pattern.
> In lenient mode, a plus or minus sign can always precede
> a number.
> In typical ICU fashion, even this is
> not complete. It says nothing about what happens if the pattern has a sign
> and the data doesn't.
> I suggest you test all the combos with
> Daffodil and establish the truth.
> Then we need to decide what to do. If
> there is no way of controlling this (eg, parameter or env var) then the
> safest option is to backoff Daffodil to the latest ICU release that matches
> the DFDL 1.0 spec, and change the spec so that the link to ICU is specific
> rather than the generic link which is in the spec today (http://www.icu-project.org/apiref/icu4c/classDecimalFormat.html#_details)
> and which floats to the latest release. We can't have a moving target.
> Regards
>
> Steve Hanson
> IBM Hybrid Integration, Hursley, UK
> Architect, IBM
> DFDL
> Co-Chair, OGF
> DFDL Working Group
> smh@uk.ibm.com
> tel:+44-1962-815848
> mob:+44-7717-378890
> Note: I work Tuesday to Friday
> From:
> Mike Beckerle <mb...@gmail.com>
> To:
> DFDL-WG <df...@ogf.org>
> Date:
> 29/08/2019 19:49
> Subject:
> [DFDL-WG] Action
> 313: Plus '+' sign and lax textNumberCheckPolicy
> Sent by:
> "dfdl-wg"
> <df...@ogf.org>
> Looks like ICU changed behavior....
> From: Steve Lawrence <sl...@apache.org>
> Sent: Thursday, August 29, 2019 1:30 PM
> To: users@daffodil.apache.org
> Subject: Re: Plus '+' sign and lax textNumberCheckPolicy - was: Re: How
> to model a fixed-length integer that may be padded with space on the left?
> I think this is a difference in ICU version?
> A little grepping through ICU source, I found a change [1] to their
> number parsing logic in Dec 2017:
> + if (!isStrict) {
> + parser.addMatcher(WhitespaceMatcher.getInstance());
> + parser.addMatcher(new
> PlusSignMatcher());
> + }
> That looks to me like a change to make it so plus signs are always
> matched in lax/lenient mode regardless of the pattern (Daffodils current
> behavior). A couple minor changes have been made to that section, but
> nothing that allows you to turn if off if lenient is on.
> It's hard to tell in the git history what release that was in, but it
> looks like around version 61, which is relatively new (Daffodil is on
> version 62).
> Also, the latest version of DecimalFormatProperties.java (looks to be an
> internal implementation, so no online javadocs), has javadocs that
> states that plus signs are always allowed in lenient/lax mode [2].
> I think this is a change in ICU behavior in newer versions.
> - Steve
> [1]
> https://github.com/unicode-org/icu/commit/68340c8464bd988477d6c88f46f9dfe4562a6d02#diff-565b07c255337881b4e06f766691667cR119-R122
> [2]
> https://github.com/unicode-org/icu/blob/master/icu4j/main/classes/core/src/com/ibm/icu/impl/number/DecimalFormatProperties.java#L53-L54
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