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local stanza_mt = require "util.stanza".stanza_mt;
local setmetatable = setmetatable;
local pairs = pairs;
local ipairs = ipairs;
local error = error;
local loadstring = loadstring;
local debug = debug;
local t_remove = table.remove;
local parse_xml = require "util.xml".parse;
module("template")
local function trim_xml(stanza)
for i=#stanza,1,-1 do
local child = stanza[i];
if child.name then
trim_xml(child);
else
child = child:gsub("^%s*", ""):gsub("%s*$", "");
stanza[i] = child;
if child == "" then t_remove(stanza, i); end
end
end
end
local function create_string_string(str)
str = ("%q"):format(str);
str = str:gsub("{([^}]*)}", function(s)
return '"..(data["'..s..'"]or"").."';
end);
return str;
end
local function create_attr_string(attr, xmlns)
local str = '{';
for name,value in pairs(attr) do
if name ~= "xmlns" or value ~= xmlns then
str = str..("[%q]=%s;"):format(name, create_string_string(value));
end
end
return str..'}';
end
local function create_clone_string(stanza, lookup, xmlns)
if not lookup[stanza] then
local s = ('setmetatable({name=%q,attr=%s,tags={'):format(stanza.name, create_attr_string(stanza.attr, xmlns));
-- add tags
for i,tag in ipairs(stanza.tags) do
s = s..create_clone_string(tag, lookup, stanza.attr.xmlns)..";";
end
s = s..'};';
-- add children
for i,child in ipairs(stanza) do
if child.name then
s = s..create_clone_string(child, lookup, stanza.attr.xmlns)..";";
else
s = s..create_string_string(child)..";"
end
end
s = s..'}, stanza_mt)';
s = s:gsub('%.%.""', ""):gsub('([=;])""%.%.', "%1"):gsub(';"";', ";"); -- strip empty strings
local n = #lookup + 1;
lookup[n] = s;
lookup[stanza] = "_"..n;
end
return lookup[stanza];
end
local function create_cloner(stanza, chunkname)
local lookup = {};
local name = create_clone_string(stanza, lookup, "");
local f = "local setmetatable,stanza_mt=...;return function(data)";
for i=1,#lookup do
f = f.."local _"..i.."="..lookup[i]..";";
end
f = f.."return "..name..";end";
local f,err = loadstring(f, chunkname);
if not f then error(err); end
return f(setmetatable, stanza_mt);
end
local template_mt = { __tostring = function(t) return t.name end };
local function create_template(templates, text)
local stanza, err = parse_xml(text);
if not stanza then error(err); end
trim_xml(stanza);
local info = debug.getinfo(3, "Sl");
info = info and ("template(%s:%d)"):format(info.short_src:match("[^\\/]*$"), info.currentline) or "template(unknown)";
local template = setmetatable({ apply = create_cloner(stanza, info), name = info, text = text }, template_mt);
templates[text] = template;
return template;
end
local templates = setmetatable({}, { __mode = 'k', __index = create_template });
return function(text)
return templates[text];
end;
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