| 词条 | Module:Array |
| 释义 | local Array = {} local array_constructor -- Copy table library so as not to unexpectedly change the behavior of code that-- uses it.local array_methods = mw.clone(table) -- Create version of table.sort that returns the table.array_methods.sort = function (t, comp) table.sort(t, comp) return t end -- ipairs and unpack operate on arrays.array_methods.ipairs = ipairs array_methods.unpack = unpack function array_methods:type() local mt = getmetatable(self) return type(mt) == "table" and mt.__type or nil end function array_methods:adjustIndex(index) index = math.floor(index) if index < 0 then index = #self + index + 1 end return index end -- string.sub-style slicing.function array_methods:slice(i, j) if type(i) == "number" then i = self:adjust_index(i) else error("Expected number, got " .. type(i)) end
if j == nil or type(j) == "number" then j = self:adjust_index(j or -1) else error("Expected number, got " .. type(j)) end
local new_arr = array_constructor() for index = i, j do new_arr:insert(self[index]) -- Fix! Will do weird stuff to sparse arrays! end return new_arr end -- A function to convert string key-table modules such-- as languages/data2 into arrays.-- "from" is a bad name.-- field_for_key supplies the field name in which the-- key will be stored.local function to_array(map, field_for_key) m_table = m_table or require "Module:TableTools"
local arr = {} local i = 0 for key, val in pairs(map) do i = i + 1 local new_val = m_table.shallowcopy(val) if field_for_key then new_val[field_for_key] = key end arr[i] = new_val end
return array_constructor(arr) end -- Functions from TableTools that operate on arrays or sparse arrays.-- List copied from Module:table/documentation.local operate_on_array = { -- non-sparse "removeDuplicates", "length", "contains", "serialCommaJoin", "reverseIpairs", "reverse", "invert", "listToSet", "isArray", -- sparse "numKeys", "maxIndex", "compressSparseArray", "sparseIpairs" } -- Not all of these operate on arrays.local create_new_array = { -- Functions from TableTools that create an array. -- List copied from table/documentation. "removeDuplicates", "numKeys", "affixNums", "compressSparseArray", "keysToList", "reverse", -- Functions from fun that create an array. "map", "filter", } -- Functions from fun that take an array in the second argument.-- They just have to have the argument order reversed to work as methods of the-- array object.local second_argument_is_array = { "map", "some", "all", "filter" } -- Add shorter aliases for the functions from TableTools whose names-- contain "array" or "list", which is redundant.-- The key redirects to the value.local alias_of = { compress = "compressSparseArray", keys = "keysToList", toSet = "listToSet", } local function get_module_function(key, module, module_name) return module[key] or error("No function named " .. tostring(key) .. " in Module:" .. module_name) end local function wrap_in_array_constructor(func) return function (...) return array_constructor(func(...)) end end local function create_array_generating_func(key, module, module_name) return wrap_in_array_constructor(get_module_function(key, module, module_name)) end local function reverse_arguments(func) return function (a, b) return func(b, a) end end local function underscore_to_camel_case(str) if type(str) ~= "string" then return str end str = str:gsub("_(.)", string.upper) return str end local m_table, m_fun local Array = {} Array.__type = "array" function Array:__index(key) if type(key) ~= "string" then return nil end
-- Convert underscores to camel case: num_keys -> numKeys. key = underscore_to_camel_case(key)
local val = array_methods[key] if val then return val end
key = alias_of[key] or key
local func m_table = m_table or require "Module:TableTools" if m_table.contains(operate_on_array, key) then if m_table.contains(create_new_array, key) then func = create_array_generating_func(key, m_table, "table") else func = m_table[key] end elseif m_table.contains(second_argument_is_array, key) then m_fun = m_fun or require "Module:fun"
local raw_func = reverse_arguments(get_module_function(key, m_fun, "fun")) if m_table.contains(create_new_array, key) then func = wrap_in_array_constructor(raw_func) else func = raw_func end end
if func then array_methods[key] = func return func end end function Array.__add(a, b) if type(a) == 'table' and type(b) == 'table' then m_table = m_table or require "Module:TableTools"
local new_arr = array_constructor(m_table.shallowcopy(a))
for _, val in ipairs(b) do new_arr:insert(val) end
return new_arr end end function Array:new(...) local arr if select("#", ...) == 1 and type((...)) == "table" then arr = ...
local mt = getmetatable(arr) -- If table has been loaded with mw.loadData, copy it to avoid the -- limitations of it being a virtual table. if mt and mt.mw_loadData then m_table = m_table or require "Module:TableTools" arr = m_table.shallowcopy(arr) end else arr = { ... } end return setmetatable(arr, self) end -- Declared as local above.function array_constructor(...) return Array:new(...) end local array_generating_funcs = { from = to_array } local Array_library_mt = { __call = Array.new, __index = array_generating_funcs } setmetatable(Array, Array_library_mt) function Array_library_mt:__index(key) key = underscore_to_camel_case(key) key = alias_of[key] or key
if array_generating_funcs[key] then return array_generating_funcs[key] end
m_table = m_table or require "Module:TableTools"
if m_table.contains(create_new_array, key) and not m_table.contains(operate_on_array, key) then local func = create_array_generating_func(key, m_table, "table") array_generating_funcs[key] = func return func end end return Array |
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