Re: XML to ConTeXt: converting date attribute from ISO date

From: Hans Hagen <j.hagen@xs4all.nl>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>,
	Mike O'Connor <ipso.vocat@gmail.com>
Subject: Re: XML to ConTeXt: converting date attribute from ISO date
Date: Wed, 15 Aug 2018 14:04:05 +0200	[thread overview]
Message-ID: <a25f7e83-ccad-4e4c-2f31-f57d9770a53e@xs4all.nl> (raw)
In-Reply-To: <16FB1586-A34F-488F-807C-4D4C15826261@gmail.com>

On 8/15/2018 12:27 PM, Mike O'Connor wrote:
> G’Day,
> 
> Having a first go at converting TEI XML to ConTeXt.
> 
> Steep learning curve, but easier (for me) than XSLT, and first results 
> were amazing.  Using 
> http://www.pragma-ade.com/general/manuals/xml-mkiv.pdf as a guide.
> 
> Currently stuck on converting an ISO format date (eg. 1908-01-10) into 
> something more readable (eg. 10 January 1908) in the output.  I presume 
> I should create a function (?luacode) that can take any ISO value and 
> output the readable form.  The following works but seems to me inefficient.
> 
> Grateful for any pointers.
> 
> Mike
> 
> Here is my MWE:
> 
> \startbuffer[demo]
> <TEI>
>      <text>
>          <body>
>              <div type="letter">
>                  <opener>
>                      <date when-iso="1908-01-10" 
> type="divDate">10.I.08</date>
>                  </opener>
>                  <closer>
> <date when-iso="1908-03-19" type="secondDate">19 Mar '08</date>
>                  </closer>
>              </div>
>          </body>
>      </text>
> </TEI>
> \stopbuffer
> 
> \startxmlsetups xml:initialize
> \xmlsetsetup{#1}{date}{xml:date}
> \stopxmlsetups
> \xmlregistersetup{xml:initialize}
> 
> \startxmlsetups xml:date
> \xmldoifelse {#1}{.[@type='divDate']} {
> \def\docdate{\ctxlua{
> local tyear = string.sub('\xmlatt{#1}{when-iso}',1,4)
> local tmonth = string.sub('\xmlatt{#1}{when-iso}',6,7)
> local tday = string.sub('\xmlatt{#1}{when-iso}',9,10)
> context.date{d = tday, m = tmonth, y = tyear}
> }}
> \docdate[day,month,year] = Document Date \par
>      } {
> \def\docdate{\ctxlua{
> local tyear = string.sub('\xmlatt{#1}{when-iso}',1,4)
> local tmonth = string.sub('\xmlatt{#1}{when-iso}',6,7)
> local tday = string.sub('\xmlatt{#1}{when-iso}',9,10)
> context.date{d = tday, m = tmonth, y = tyear}
> }}
> \docdate[day,month,year] = Event Date\par
> }
> \stopxmlsetups
> 
> \starttext
> \xmlprocessbuffer{main}{demo}{}
> \stoptext
Can be wikified ...

\startluacode
     function xml.finalizers.tex.MyDate(e,what,how)
         local t = string.split(e[1].at[what],"-")
         context.date(
             { y = t[1], m = t[2], d = t[3] },
             { how }
         )
     end
\stopluacode

\startxmlsetups xml:date

	\xmldoifelse {#1}{.[@type='divDate']} {
         \xmlfilter{#1}{./MyDate("when-iso","day,month,year")}\
     	Document Date \par
     } {
         \xmlfilter{#1}{./MyDate("when-iso","day,month,year")}\
         Event Date\par

	}
\stopxmlsetups

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