view mod_latex/mod_latex.lua @ 4895:2542fd80cd15

mod_turn_external: Fix type of config option (thanks mirux) There was a separate boolean option to enable TLS before, but it was merged with the port number option and it seems the typed API interface got confused. Backport of trunk rev aa7a8aa64d3f
author Kim Alvefur <zash@zash.se>
date Tue, 15 Feb 2022 21:51:52 +0100
parents df8da7e4c2bf
children
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local st = require "stanza";
local urlencode = require "net.http".urlencode;

local xmlns_xhtmlim = "http://jabber.org/protocol/xhtml-im";
local xmlns_xhtml = "http://www.w3.org/1999/xhtml";

local function replace_latex(data)
	local origin, stanza = data.origin, data.stanza;
	local body = stanza:get_child_text("body");
	if not body or not body:match("%$%$") then
		return;
	end
	module:log("debug", "Replacing latex...");

	local html = st.stanza("html", { xmlns = xmlns_xhtmlim })
		:tag("body", { xmlns = xmlns_xhtml });

	local in_latex, last_char;
	for snippet, up_to in body:gmatch("(.-)%$%$()") do
		last_char = up_to;
		if in_latex then
			-- Render latex and add image, next snippet is text
			in_latex = nil;
			html:tag("img", { src = "http://www.mathtran.org/cgi-bin/mathtran?D=2;tex="..urlencode(snippet), alt = snippet }):up();
		else
			-- Add text to HTML, next snippet is latex
			in_latex = true;
			html:tag("span"):text(snippet):up();

		end
	end
	if last_char < #body then
		html:tag("span"):text(body:sub(last_char, #body)):up();
	end

	for n, tag in ipairs(stanza.tags) do
		module:log("debug", "Tag: %s|%s", tag.attr.xmlns or "", tag.name or "");
		if tag.name == "html" and tag.attr.xmlns == xmlns_xhtmlim then
			stanza.tags[n] = html;
			for n, child in ipairs(stanza) do
				if child == tag then
					stanza[n] = html;
				end
			end
			return;
		end
	end

	stanza[#stanza+1] = html;
	stanza.tags[#stanza.tags+1] = html;
end

module:hook("message/bare", replace_latex, 30);
module:hook("message/full", replace_latex, 30);