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comparison mod_latex/mod_latex.lua @ 126:e190c1643a8f

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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
parents
children 7dbde05b48a9
comparison
equal deleted inserted replaced
125:8111c8a9e1ad 126:e190c1643a8f
1 local st = require "stanza";
2 local urlencode = require "net.http".urlencode;
3
4 local xmlns_xhtmlim = "http://jabber.org/protocol/xhtml-im";
5 local xmlns_xhtml = "http://www.w3.org/1999/xhtml";
6
7 local function replace_latex(data)
8 module:log("debug", "Replacing latex...");
9 local origin, stanza = data.origin, data.stanza;
10 local body = stanza:child_with_name("body");
11 if not body then return; end
12
13 body = body:get_text();
14 if not body:match("%$%$") then
15 return;
16 end
17
18 local html = st.stanza("html", { xmlns = xmlns_xhtmlim })
19 :tag("body", { xmlns = xmlns_xhtml });
20
21 local in_latex, last_char;
22 for snippet, up_to in body:gmatch("(.-)%$%$()") do
23 last_char = up_to;
24 if in_latex then
25 -- Render latex and add image, next snippet is text
26 in_latex = nil;
27 html:tag("img", { src = "http://www.mathtran.org/cgi-bin/mathtran?D=2;tex="..urlencode(snippet), alt = snippet }):up();
28 else
29 -- Add text to HTML, next snippet is latex
30 in_latex = true;
31 html:tag("span"):text(snippet):up();
32
33 end
34 end
35 if last_char < #body then
36 html:tag("span"):text(body:sub(last_char, #body)):up();
37 end
38
39 for n, tag in ipairs(stanza.tags) do
40 module:log("debug", "Tag: %s|%s", tag.attr.xmlns or "", tag.name or "");
41 if tag.name == "html" and tag.attr.xmlns == xmlns_xhtmlim then
42 stanza.tags[n] = html;
43 for n, child in ipairs(stanza) do
44 if child == tag then
45 stanza[n] = html;
46 end
47 end
48 return;
49 end
50 end
51
52 stanza[#stanza+1] = html;
53 stanza.tags[#stanza.tags+1] = html;
54 end
55
56 module:hook("message/bare", replace_latex, 30);
57 module:hook("message/full", replace_latex, 30);