Module:Political party

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This module is rated as ready for general use. It has reached a mature form and is thought to be relatively bug-free and ready for use wherever appropriate. It is ready to mention on help pages and other Wikipedia resources as an option for new users to learn. To reduce server load and bad output, it should be improved by sandbox testing rather than repeated trial-and-error editing.

This module is subject to page protection. It is a highly visible module in use by a very large number of pages, or is substituted very frequently. Because vandalism or mistakes would affect many pages, and even trivial editing might cause substantial load on the servers, it is protected from editing.

This Lua module is used on approximately 134,000 pages.
To avoid major disruption and server load, any changes should be tested in the module's /sandbox or /testcases subpages, or in your own module sandbox. The tested changes can be added to this page in a single edit. Consider discussing changes on the talk page before implementing them.

This module depends on the following other modules:

Usage

{{#invoke:Political party|fetch|<party>|<value>}}

Parameters

Parameter	Description
1	The political party's name. If a party is not found, place a request at the talk page.
error	Optional, this parameter will return the provided `\|error=` value if the module does not contain the requested party or color.

Updating the module

The political parties contained in this module are split into alphabetised lists based on the first character of the name (for example, "Labour Party (UK)" would be under /L). The /1 subpage is for any party that does not start with the letters A to Z of the Latin alphabet (including numbers and accented characters).

Within each data submodule are two local groups: local alternate and local full.

Alternate party names

The alternate group is for alternate names of a party. The following is an example of alternate names for the Labour Party (UK):

local alternate = {
    ....
	["Labour and Co-operative"] = "Labour Party (UK)",
	["Labour Co-operative"] = "Labour Party (UK)",
    ...
}

The first entry in square brackets is the alternate name, and the second entry only in quotes is the name found in the full group, seen below. Note that the alternate name of a party should be stored in its corresponding letter-based subpage; "Alabama Democratic Party" is listed in /A even though it is an alternate name for "Democratic Party (US)" (which is stored in /D).

Table values

local full = {
    ....
	["Labour Party (UK)"] = {abbrev = "Lab", color = "#E4003B", shortname = "Labour",},
    ...
}

There are three values stored for each party:

The abbreviation (abbrev).
The color of the party (color), which can either be a hex triplet or basic color name or, if the party does not have an associated color, "default".
A shorter name for the party (shortname).

The values added to these parameters need not be unique from other parties in this module, unlike the primary name of a party.

If a name value is not stored for a party, the module will attempt to return the other "short" name variant before returning the input. Thus, if abbrev is stored but shortname is not, regardless of which value is asked for it will return the abbrev value.

Requesting an addition or a change

Requests should be made at the talk page in a new section. Copy the following line and fill in only the fields relevant to the party. A party name is required as is at least one other piece of information. See above for information regarding each value.

["party"] = {abbrev = "", color = "", shortname = "",},

Error messages

Module error messages and resolutions
Error message	Resolution
Lua error: bad argument #1 to 'sub' (string expected, got table).	An entry intended for the "local full" section has been placed into the "local alternate" section. Move it to the "local full" section
Lua error in package.lua at line 80: module 'Module:Political party/' not found.	Party added to alternate list with empty value.
Value not in template. Please request that it be added. (article search)	The party in question has an entry with no color in the "local full" section. (This can be caused by duplicate entries in "local full" that, if present, should be merged.)
(no error message, but party color is white/blank)	Add a color for the party to its entry in the "local full" section in the relevant Module:Political party/ lettered data page (see links below).
parameter 1 should be a party name (article search)	A template is trying to feed a missing parameter to the module. Work around this by testing for the parameter in the template.
parameter 2 should be the output type (article search)

Data pages

The above documentation is transcluded from Module:Political party/doc.
Editors can experiment in this module's sandbox and testcases pages.
Subpages of this module.

local p = {}

local function stripToNil(text)
	-- If text is a string, return its trimmed content, or nil if empty.
	-- Otherwise return text (which may, for example, be nil).
	if type(text) == 'string' then
		text = text:match('(%S.-)%s*$')
	end
	return text
end

function p.fetch(frame)
	local party = nil
	local index = nil
	local return_value = nil
	local args = frame:getParent().args
 
	party = stripToNil(args[1]) or error('parameter 1 should be a party name')
	out_type = stripToNil(args[2]) or error('parameter 2 should be the output type')
	index = mw.ustring.sub(party,1,1)
	local datamod = mw.loadData('Module:Political names/' .. out_type .. '/' .. index)
	local data_all = datamod.full
	local data_alt = datamod.alternate
	
	return_value = data_all[party] or data_all[data_alt[party]]
	
	-- If database value doesn't exist, return input
	if return_value == nil and frame.args[1] ~= nil then
		return_value = error('value not in template. Please request that it be added')
	end
	
	return return_value	
end

return p