[NTG-context] XML and math

Henri Menke henrimenke at gmail.com
Thu Jan 10 23:00:02 CET 2019


On 11/01/19 10:26 AM, Aditya Mahajan wrote:
> Hi,
> 
> I have an XML file (which is generated via a program that I have no
> control over), which contains elements as follows:
> 
>          <p>
>             <equation text="$$y_1(t) = 1, t \geq 0$$">
>                <img alt="$$y_1(t) = 1, t \geq 0$$" class="equation"
> height="15px" src="Lab01_eq10401623798909303081.png" width="95px"/>
>             </equation>
>          </p>
> 
> I want to typeset the `text` attribute of equation (and ignore the <img>
> tag). So, I tried:
> 
> \startxmlsetups matlab
>   % Bunch of missing definitions
>   \xmlsetsetup{#1}{equation}{matlab:*}
> \stopxmlsetups
> 
> \startxmlsetups matlab:equation
>   \xmlatt{#1}{text}
> \stopxmlsetups
> 
> This literally typesets `$$y_1(t) = 1, t \geq 0$$`. How can I flush the
> attribute using ctxcatcodes? (There is \xmlflushcontent, but that is for
> content and not attributes).

You could write your own attribute fetcher in Lua.  Probably there is a
more elegant method.

\startbuffer[test]
         <p>
            <equation text="$$y_1(t) = 1, t \geq 0$$">
               <img alt="$$y_1(t) = 1, t \geq 0$$" class="equation"
height="15px" src="Lab01_eq10401623798909303081.png" width="95px"/>
            </equation>
         </p>
\stopbuffer

\startxmlsetups matlab
  % Bunch of missing definitions
  \xmlsetsetup{#1}{p}{matlab:*}
  \xmlsetsetup{#1}{equation}{matlab:*}
\stopxmlsetups

\startxmlsetups matlab:p
  \xmlflush{#1}
\stopxmlsetups

\startxmlsetups matlab:equation
  \xmlfunction{#1}{equation}
\stopxmlsetups
\startluacode
local a = "text"
local ctxcatcodes = catcodes.numbers.ctxcatcodes

function xml.functions.equation(id)
    local e = lxml.getid(id)
    if e then
        local at = e.at
        if at then
            local att = at[a]
            if att ~= "" then
                context.sprint(ctxcatcodes,att)
            end
        end
    end
end
\stopluacode

\xmlregistersetup{matlab}

\starttext
\xmlprocessbuffer{test}{test}{}
\stoptext


> 
> Thanks,
> Aditya
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