Difference between revisions of "Module:Arguments"

19 bytes added ,  10:16, 27 April 2014
no edit summary
>Mr. Stradivarius
(memoize nils using a separate nilArgs table; this fixes a bug where nil values were being iterated over with pairs())
Line 2: Line 2:
-- #invoke. It is intended for use by other Lua modules, and should not be
-- #invoke. It is intended for use by other Lua modules, and should not be
-- called from #invoke directly.
-- called from #invoke directly.
 
local libraryUtil = require('libraryUtil')
local libraryUtil = require('libraryUtil')
local checkType = libraryUtil.checkType
local checkType = libraryUtil.checkType
 
local arguments = {}
local arguments = {}
 
-- Generate four different tidyVal functions, so that we don't have to check the
-- Generate four different tidyVal functions, so that we don't have to check the
-- options every time we call it.
-- options every time we call it.
 
local function tidyValDefault(key, val)
local function tidyValDefault(key, val)
if type(val) == 'string' then
if type(val) == 'string' then
Line 23: Line 23:
end
end
end
end
 
local function tidyValTrimOnly(key, val)
local function tidyValTrimOnly(key, val)
if type(val) == 'string' then
if type(val) == 'string' then
Line 31: Line 31:
end
end
end
end
 
local function tidyValRemoveBlanksOnly(key, val)
local function tidyValRemoveBlanksOnly(key, val)
if type(val) == 'string' then
if type(val) == 'string' then
Line 43: Line 43:
end
end
end
end
 
local function tidyValNoChange(key, val)
local function tidyValNoChange(key, val)
return val
return val
end
end
 
function arguments.getArgs(frame, options)
function arguments.getArgs(frame, options)
checkType('getArgs', 1, frame, 'table', true)
checkType('getArgs', 1, frame, 'table', true)
Line 53: Line 53:
frame = frame or {}
frame = frame or {}
options = options or {}
options = options or {}
 
--[[
--[[
-- Get the arguments from the frame object if available. If the frame object
-- Get the arguments from the frame object if available. If the frame object
Line 74: Line 74:
luaArgs = frame
luaArgs = frame
end
end
-- Set the order of precedence of the argument tables. If the variables are
-- Set the order of precedence of the argument tables. If the variables are
-- nil, nothing will be added to the table, which is how we avoid clashes
-- nil, nothing will be added to the table, which is how we avoid clashes
Line 81: Line 81:
argTables[#argTables + 1] = pargs
argTables[#argTables + 1] = pargs
argTables[#argTables + 1] = luaArgs
argTables[#argTables + 1] = luaArgs
 
--[[
--[[
-- Generate the tidyVal function. If it has been specified by the user, we
-- Generate the tidyVal function. If it has been specified by the user, we
Line 112: Line 112:
end
end
end
end
 
--[[
--[[
-- Set up the args, metaArgs and nilArgs tables. args will be the one
-- Set up the args, metaArgs and nilArgs tables. args will be the one
Line 121: Line 121:
local args, metaArgs, nilArgs, metatable = {}, {}, {}, {}
local args, metaArgs, nilArgs, metatable = {}, {}, {}, {}
setmetatable(args, metatable)
setmetatable(args, metatable)
 
local function mergeArgs(iterator, tables)
local function mergeArgs(iterator, tables)
--[[
--[[
Line 143: Line 143:
end
end
end
end
 
--[[
--[[
-- Define metatable behaviour. Arguments are memoized in the metaArgs table,
-- Define metatable behaviour. Arguments are memoized in the metaArgs table,
Line 155: Line 155:
-- the arguments will already have been copied over.
-- the arguments will already have been copied over.
--]]
--]]
 
metatable.__index = function (t, key)
metatable.__index = function (t, key)
--[[
--[[
Line 185: Line 185:
return nil
return nil
end
end
 
metatable.__newindex = function (t, key, val)
metatable.__newindex = function (t, key, val)
-- This function is called when a module tries to add a new value to the
-- This function is called when a module tries to add a new value to the
Line 217: Line 217:
end
end
end
end
 
metatable.__pairs = function ()
metatable.__pairs = function ()
-- Called when pairs is run on the args table.
-- Called when pairs is run on the args table.
Line 227: Line 227:
return pairs(metaArgs)
return pairs(metaArgs)
end
end
 
metatable.__ipairs = function ()
metatable.__ipairs = function ()
-- Called when ipairs is run on the args table.
-- Called when ipairs is run on the args table.
Line 236: Line 236:
return ipairs(metaArgs)
return ipairs(metaArgs)
end
end
 
return args
return args
end
end
 
return arguments
return arguments
Anonymous user