Make:match fails if there is a footnote #145
Description
I'm trying to extract all the mathml into an extra file. Based on https://chat.stackexchange.com/transcript/41?m=65070731#65070731 I tried with this
extract-math.mk4:
local domfilter = require "make4ht-domfilter"
local process = domfilter {"mathmlfixes", -- fix mathml first
function(dom, par)
local filename = par.input .. "-mathml.mml"
local f = io.open(filename, "w")
for count, math in ipairs(dom:query_selector "math") do
f:write("\n"..count.."\n")
f:write(math:serialize())
end
f:close()
return dom
end
}
Make:match("html", process)
I then call it for test-utf8.tex with make4ht -l -e extract-math.mk4 test-utf8 "mathml"
This works fine for
\documentclass{article}
\begin{document}
$a=b$ and $x=y$
%a\footnote{blub}
\end{document}
and the files contains
1
<math display='inline' xmlns='http://www.w3.org/1998/Math/MathML'><mrow><mi>a</mi> <mo class='MathClass-rel' stretchy='false'>=</mo> <mi>b</mi></mrow></math>
2
<math display='inline' xmlns='http://www.w3.org/1998/Math/MathML'><mrow><mi>x</mi> <mo class='MathClass-rel' stretchy='false'>=</mo> <mi>y</mi></mrow></math>
But as soon as I uncomment the footnote in the example above the file is empty.