Module:Item

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local p = {}

local function escape(str) return str:gsub("[|\\]", function (c) return string.format("\\%03d", c:byte()) end) end

local function unescape(str) return str:gsub("\\(%d%d%d)", function (d) return string.char(d) end) end

-- Implements Template:Item function p.pack(frame) local parent = frame:getParent() local result = for key, value in pairs(parent.args) do result = result .. "|" .. escape(tostring(key)) .. "|" .. escape(value) end return result .. "|"; end

local function unpack(str) local result = { } for key, value in str:gfind("|([^|]*)|([^|]*)") do result[unescape(key)] = unescape(value) end return result end

-- Implements Template:Component function p.component(frame) return unpack(frame.args[1])[frame.args[2]] end

local function getItems(frame) return frame:getParent().args end

local function invert(tbl) local result = { } for key, value in pairs(tbl) do result[value] = key end return result end

-- Add args into item as appropriate (see Template:Format item) local function addArgs( item, -- unpacked item to modify args, -- arguments for adding into item ignore, -- pass in invert{keys to ignore} shift -- for numbered arguments, args[key+shift] is assigned to item[key] -- returns: item ) for key, value in pairs(args) do if not ignore[key] then local _, _, paramKey = string.find(key, "^param (.*)") local _, _, importantKey = string.find(key, "^important (.*)") paramKey = paramKey or importantKey or key if shift and type(paramKey) == "number" then paramKey = paramKey - shift if paramKey < 1 then paramKey = nil end end if paramKey and (importantKey or item[paramKey] == nil) then item[paramKey] = value end end end

return item end

-- Implements Template:Format item function p.format(frame) local args = frame:getParent().args local ignore = invert{ "template", "item" } local templateArgs = addArgs(unpack(args.item), args, ignore)

return frame:expandTemplate{ title = args.template, args = templateArgs } end

-- See Template:Item#Format each item using a template function p.each(frame) local args = frame.args local items = getItems(frame) local separator = args[1] or "" local prepend = args[2] or "" local append = args[3] or "" local ignore = invert{ "template" } local shift = 3

local result = "" for i, item in ipairs(items) do local templateArgs = addArgs(unpack(item), args, ignore, shift) result = result .. prepend .. frame:expandTemplate{ title = args.template, args = templateArgs } .. append if items[i + 1] then result = result .. separator end end return result end

-- See Template:Item#Gather given parameter from all items function p.gather(frame) local args = frame.args local items = getItems(frame) local parameter = args.parameter or "1"

local templateArgs = { } for i, item in ipairs(items) do templateArgs[i] = unpack(item)[parameter] end

return frame:expandTemplate{ title = args.template, args = templateArgs } end

return p