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local st = require "util.stanza";
-- XML parser
local parse_xml = (function()
local entity_map = setmetatable({
["amp"] = "&";
["gt"] = ">";
["lt"] = "<";
["apos"] = "'";
["quot"] = "\"";
}, {__index = function(_, s)
if s:sub(1,1) == "#" then
if s:sub(2,2) == "x" then
return string.char(tonumber(s:sub(3), 16));
else
return string.char(tonumber(s:sub(2)));
end
end
end
});
local function xml_unescape(str)
return (str:gsub("&(.-);", entity_map));
end
local function parse_tag(s)
local name,sattr=(s):gmatch("([^%s]+)(.*)")();
local attr = {};
for a,b in (sattr):gmatch("([^=%s]+)=['\"]([^'\"]*)['\"]") do attr[a] = xml_unescape(b); end
return name, attr;
end
return function(xml)
local stanza = st.stanza("root");
local regexp = "<([^>]*)>([^<]*)";
for elem, text in xml:gmatch(regexp) do
if elem:sub(1,1) == "!" or elem:sub(1,1) == "?" then -- neglect comments and processing-instructions
elseif elem:sub(1,1) == "/" then -- end tag
elem = elem:sub(2);
stanza:up(); -- TODO check for start-end tag name match
elseif elem:sub(-1,-1) == "/" then -- empty tag
elem = elem:sub(1,-2);
local name,attr = parse_tag(elem);
stanza:tag(name, attr):up();
else -- start tag
local name,attr = parse_tag(elem);
stanza:tag(name, attr);
end
if #text ~= 0 then -- text
stanza:text(xml_unescape(text));
end
end
return stanza.tags[1];
end
end)();
-- end of XML parser
return parse_xml;
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