util.xml: Initial commit; exposes parse(), which is now the canonical way to convert a string to a stanza.

1 files changed, 57 insertions, 0 deletions

diff --git a/util/xml.lua b/util/xml.lua
new file mode 100644
index 00000000..db446bc3
--- /dev/null
+++ b/util/xml.lua
@@ -0,0 +1,57 @@
+
+local st = require "util.stanza";
+local lxp = require "lxp";
+
+module("template")
+
+local parse_xml = (function()
+	local ns_prefixes = {
+		["http://www.w3.org/XML/1998/namespace"] = "xml";
+	};
+	local ns_separator = "\1";
+	local ns_pattern = "^([^"..ns_separator.."]*)"..ns_separator.."?(.*)$";
+	return function(xml)
+		local handler = {};
+		local stanza = st.stanza("root");
+		function handler:StartElement(tagname, attr)
+			local curr_ns,name = tagname:match(ns_pattern);
+			if name == "" then
+				curr_ns, name = "", curr_ns;
+			end
+			if curr_ns ~= "" then
+				attr.xmlns = curr_ns;
+			end
+			for i=1,#attr do
+				local k = attr[i];
+				attr[i] = nil;
+				local ns, nm = k:match(ns_pattern);
+				if nm ~= "" then
+					ns = ns_prefixes[ns]; 
+					if ns then 
+						attr[ns..":"..nm] = attr[k];
+						attr[k] = nil;
+					end
+				end
+			end
+			stanza:tag(name, attr);
+		end
+		function handler:CharacterData(data)
+			stanza:text(data);
+		end
+		function handler:EndElement(tagname)
+			stanza:up();
+		end
+		local parser = lxp.new(handler, "\1");
+		local ok, err, line, col = parser:parse(xml);
+		if ok then ok, err, line, col = parser:parse(); end
+		--parser:close();
+		if ok then
+			return stanza.tags[1];
+		else
+			return ok, err.." (line "..line..", col "..col..")";
+		end
+	end;
+end)();
+
+parse = parse_xml;
+return _M;