From: Hans Hagen <pragma@wxs.nl>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: xml expression error
Date: Fri, 13 May 2016 00:10:53 +0200 [thread overview]
Message-ID: <e47cf384-1b9d-588d-17cd-754b869a8c66@wxs.nl> (raw)
In-Reply-To: <6BA7C71B-3A5F-4F0E-8968-FBF42ED9F18A@uva.nl>
On 5/12/2016 1:49 PM, Meer, Hans van der wrote:
> I think I have the problem nailed down to the fact that in the comparison:
> something >= -1234
> the parser in question separates the minus in the negative number into a
> separate child node, apart from the digits; witness the errormessage in
> the log below.
> Changing the number -1234 in the arithmetic expression
> tonumber("-1234") (mind the quotes) does give a correctly evaluated
> expression.
>
> Still, I am baffled by the fact that in arithmetic expressions positive
> and negative numbers are treated differently in the filtering operation.
it's more that 'names' are intercepted .. can you test (lxml-lpt.lua)
with:
local lp_child = Cc("expr.child(ll,'") * R("az","AZ") *
R("az","AZ","--","__")^0 * Cc("')")
Hans
> Hans van der Meer
>
>
>> On 29 Apr 2016, at 15:04, Meer, Hans van der <H.vanderMeer@uva.nl
>> <mailto:H.vanderMeer@uva.nl>> wrote:
>>
>> Here is a minimal example showing that even a number as -1 is not
>> correctly handled by the lpath[selection]-code.
>> I really am convinced that not handling negative numbers should
>> qualify as a mistake.
>>
>> Hans van der Meer
>>
>>
>> % failure of negative number comparison.
>> \startxmlsetups demo:numberfail
>> \xmlsetsetup{#1}{root|node}{demo:numberfail:*}
>> \stopxmlsetups
>> \xmlregisterdocumentsetup{demo}{demo:numberfail}
>> \startxmlsetups demo:numberfail:root
>> @atta >= 1:\crlf
>> \xmlfilter{#1}{/[number(@atta) >= 1]/command(demo:numberfail:node)}
>> \blank
>> @atta >= -1:\crlf
>> \xmlfilter{#1}{/[number(@atta) >= -1]/command(demo:numberfail:node)}
>> \xmlfilter{#1}{/[number(@atta) >=
>> number(-1)]/command(demo:numberfail:node)}
>> \stopxmlsetups
>> \startxmlsetups demo:numberfail:node
>> node: attribute atta = \xmlatt{#1}{atta}\crlf
>> \stopxmlsetups
>> \startbuffer[numberfail]
>> <root>
>> <node atta="2"/>
>> <node atta="3"/>
>> </root>
>> \stopbuffer
>> \starttext
>> \xmlprocessbuffer{demo}{numberfail}{}
>> the error from \type{\xmlfilter{#1}{/[number(@atta) >=
>> -1]/command(demo:numberfail:node)}}:
>> \starttyping
>> xml > lpath > error in expression: number(@atta) >= -1 =>
>> expr.number((ll.at <http://ll.at/> and ll.at <http://ll.at/>['atta']))
>> >= expr.child(ll,'-')1
>> \stoptyping
>>
>> the error from \type{\xmlfilter{#1}{/[number(@atta) >=
>> number(-1)]/command(demo:numberfail:node)}}:
>> \starttyping
>> xml > lpath > error in expression: number(@atta) >= number(-1) =>
>> expr.number((ll.at <http://ll.at/> and ll.at <http://ll.at/>['atta']))
>> >= expr.number(expr.child(ll,'-')1)
>> \stoptyping
>> \stoptext
>
>> ___________________________________________________________________________________
>
>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
> archive : http://foundry.supelec.fr/projects/contextrev/
> wiki : http://contextgarden.net
> ___________________________________________________________________________________
>
--
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Hans Hagen | PRAGMA ADE
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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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archive : http://foundry.supelec.fr/projects/contextrev/
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___________________________________________________________________________________
prev parent reply other threads:[~2016-05-12 22:10 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-28 15:06 dr. Hans van der Meer
2016-04-28 20:13 ` Pablo Rodriguez
2016-04-28 21:12 ` Meer, Hans van der
2016-04-29 13:04 ` Meer, Hans van der
2016-05-12 11:49 ` Meer, Hans van der
2016-05-12 22:10 ` Hans Hagen [this message]
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