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read_resource, write_resource, res_magic = ...;
local cat_magic = {};
local function myerror(table, msg)
error(getmetatable(table)._fullname .. ': ' .. msg);
end;
local function check_arg(table, key)
if type(key) ~= 'string' then
myerror(table, 'expecting strings as keys.');
end;
if string.match(key, "^_") then
myerror(table, 'resource names must not begin with "_".');
end;
local t = getmetatable(table)[key];
return t, getmetatable(t);
end;
local new_cat;
local function newindex(table, key, value)
local meta = getmetatable(table);
local t, mt = check_arg(table, key);
if type(value) == 'table' then
if mt == res_magic then
myerror(table, '"' .. key .. '" is a resource.');
end;
if mt == nil or mt._magic ~= cat_magic then
t = new_cat(table, key);
end;
for k,v in pairs(value) do
t[k] = v;
end;
else
if mt ~= nil and mt._magic == cat_magic and mt._state == 1 then
myerror(table, '"' .. key .. '" is a category.');
elseif mt == res_magic then
write_resource(t, value);
else
meta[key] = value;
end;
end;
end;
local function index(table, key)
local t, mt = check_arg(table, key);
if mt == res_magic then
return read_resource(t);
end;
return t;
end;
new_cat = function(table, key)
local meta = getmetatable(table);
local mt = {
__newindex = newindex, __index = index,
_magic = cat_magic, _fullname = meta._fullname .. '.' .. key, _state = 0
};
meta[key] = setmetatable({}, mt);
return meta[key];
end;
local function register_resource(root, name, object)
local meta = getmetatable(root);
meta._state = 1;
local head, tail = string.match(name, '^(%a+)%.?(.*)');
local t = meta[head];
if tail == '' then
meta[head] = object;
if getmetatable(object) == res_magic then
write_resource(object, t);
end;
return t;
end;
if t == nil then
t = new_cat(root, head);
end;
return register_resource(t, tail, object);
end;
local function dump_value(val)
if type(val) == "string" then
return string.format('%q', val);
elseif type(val) == "number" then
return string.format('%g', val);
else
error('Unsupported value type: ' .. type(val));
end;
end;
local function dump_(root, fd)
local meta = getmetatable(root);
if not string.match(meta._fullname, "^[%a.]+$") then
error("Someone has been messing with metatables.");
end;
for k, v in pairs(meta) do
if type(k) == "string" and string.match(k, "^%a+$") then
local mt = getmetatable(v);
fd:write(meta._fullname, '.', k, ' = ');
if mt ~= nil and mt._magic == cat_magic then
fd:write('{}\n');
dump(v);
fd:write('\n');
else
if mt == res_magic then
v = read_resource(v);
end;
fd:write(dump_value(v), '\n');
end;
end;
end;
end;
local function dump(root, file)
local fd = io.open(file, 'w');
dump_(root, fd);
fd:close();
end;
local function make_root(name)
local t = {
__newindex = newindex, __index = index,
_magic = cat_magic, _fullname = name, _state = 0
};
getfenv()[name] = setmetatable({}, t);
end;
return make_root, register_resource, dump;
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