prosody-modules
e190c1643a8f
mod_latex/mod_latex.lua

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mod_latex/mod_latex.lua @ 126:e190c1643a8f

mod_latex: New (well, kind of) module for rendering LaTeX in messages and replacing with a rendered embedded image
author Matthew Wild <mwild1@gmail.com>
date Wed, 27 Jan 2010 20:50:52 +0000
child 1343:7dbde05b48a9
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126
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1 local st = require "stanza";
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2 local urlencode = require "net.http".urlencode;
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3
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4 local xmlns_xhtmlim = "http://jabber.org/protocol/xhtml-im";
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5 local xmlns_xhtml = "http://www.w3.org/1999/xhtml";
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6
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7 local function replace_latex(data)
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8 module:log("debug", "Replacing latex...");
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9 local origin, stanza = data.origin, data.stanza;
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10 local body = stanza:child_with_name("body");
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11 if not body then return; end
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12
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13 body = body:get_text();
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14 if not body:match("%$%$") then
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15 return;
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16 end
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18 local html = st.stanza("html", { xmlns = xmlns_xhtmlim })
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19 :tag("body", { xmlns = xmlns_xhtml });
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20
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21 local in_latex, last_char;
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22 for snippet, up_to in body:gmatch("(.-)%$%$()") do
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23 last_char = up_to;
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24 if in_latex then
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25 -- Render latex and add image, next snippet is text
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26 in_latex = nil;
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27 html:tag("img", { src = "http://www.mathtran.org/cgi-bin/mathtran?D=2;tex="..urlencode(snippet), alt = snippet }):up();
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28 else
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29 -- Add text to HTML, next snippet is latex
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30 in_latex = true;
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31 html:tag("span"):text(snippet):up();
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32
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33 end
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34 end
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35 if last_char < #body then
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36 html:tag("span"):text(body:sub(last_char, #body)):up();
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37 end
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38
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39 for n, tag in ipairs(stanza.tags) do
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40 module:log("debug", "Tag: %s|%s", tag.attr.xmlns or "", tag.name or "");
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41 if tag.name == "html" and tag.attr.xmlns == xmlns_xhtmlim then
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42 stanza.tags[n] = html;
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43 for n, child in ipairs(stanza) do
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44 if child == tag then
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45 stanza[n] = html;
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46 end
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47 end
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48 return;
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49 end
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50 end
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52 stanza[#stanza+1] = html;
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53 stanza.tags[#stanza.tags+1] = html;
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54 end
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56 module:hook("message/bare", replace_latex, 30);
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57 module:hook("message/full", replace_latex, 30);