[tex4ht] [bug #625] Bad register code (65536) again on auto-generated Latex code

[Michal Hoftich]

Follow-up Comment #2, bug #625 (project tex4ht):

Hi Nasser, this is not limited to TeX4ht but to l3regex, which is used to
clean the MathJax code. See this question, where they found the same issue:
https://tex.stackexchange.com/q/654633/2891

In theory, you could skip the regex cleaning using this configuration file:

%%%%%%%%%%%%%%%%
\Preamble{xhtml}
\ExplSyntaxOn
\cs_set_protected:Npn \alteqtoks #1
{
  \HCode{\detokenize{#1}}
}
\ExplSyntaxOff
\begin{document}
\EndPreamble
%%%%%%%%%%%%%%%%%%%%%

The downside is that you can end with incorrect characters in your HTML, in
particular <, > and &. These can cause MathJax fail.

Also, to break your long strings, you can use this prefilter:

%%%%%%%%%%%%%%%
local max_len = 255
for line in io.lines() do
  line = line:gsub("\r", "")
  local str_len = string.len(line)
  if str_len > max_len then
    -- if the line is longer than maxlen, we will break it to a shorter
segments
    local curr_pos = max_len
    local prev_pos = 1
    while curr_pos < str_len do
      -- find next command preceded by spaces starting at the current
position
      curr_pos, len = string.find(line, "%s+\\", curr_pos)
      print(curr_pos, str_len,string.sub(line, prev_pos, curr_pos))
      prev_pos = curr_pos
      -- we must move the current position
      curr_pos = curr_pos + max_len
    end
    -- print rest of the line
    print(string.sub(line, prev_pos, str_len))
  else
    print(line)
  end
end

%%%%%%%%%%%%

Use it as:

$ texlua format.lua < original.tex > formated.tex

It will format your long lines into much shorter chunks, preventing the "!
Unable to read an entire line---bufsize=200000" error I encountered. I suppose
that you set the limit higher, but I didn't and couldn't compile your file
originally. 

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