Module:Adjacent stations

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This module implements {{Adjacent stations}}, {{Rail icon}}, {{Rail color box}}, {{Line link}}, {{Station link}} and {{Rail color}}. Please see those templates' pages for documentation on how to use those templates. (Instructions for the convert function of this module are in the {{Adjacent stations}} documentation.)

The aforementioned templates rely on data stored in subpages for this module (list). For example, {{Rail icon|MTR}} generates using Module:Adjacent stations/MTR.

It is possible to create and edit data by following existing examples, but having some knowledge of Lua helps prevent mistakes. If you have programmed or used Lua before, you may like to skip the next subsection.

Terms

For a more comprehensive overview of Lua, see mw:Extension:Scribunto/Lua reference manual.

• Lua has data types. The ones relevant here are boolean, string, number, and table.
  • A boolean is either true or false.
  • A string is text, stored as a list of characters. While Lua has several ways of indicating strings within code, in the Lua examples here, strings are indicated by enclosing text in double quotes (e.g. "This is a string").
  • A number is a numerical value, like 0.5 or 42.
  • A table is a structure that can contain other objects, including other tables.
    • An empty table looks like {} in the code.
    • Tables have keys and values, which are typically of the structure ["key"] = value; each key–value pair is separated by a comma. All keys used here are strings or numbers.
    • {"text", "more text"} is equivalent to {[1] = "text", [2] = "more text"}.
• A variable can be defined using local variable_name = "value".
• Whitespace is any tab, line break or other space. Whitespace doesn't matter in Lua, but all examples here except for those inline with text are neatly indented for readability, with separate table keys on separate lines.
• A return statement (e.g. return variable_name) causes a function to exit and reports the value of variable_name. The "function" here is the code in the main module calling the subpage, and the variable_name should be the data table.

Basic structure

Two modules are demonstrated below:

Blank

local p = { ["system title"] = "", ["system icon"] = "", ["station format"] = { "", [""] = "", }, ["lines"] = { [""] = { ["title"] = "", ["color"] = "", ["left terminus"] = "", ["right terminus"] = "", }, }, } return p

Example

local x = "%1 light rail station" local p = { ["system title"] = "[[Kaohsiung Metro]]", ["system icon"] = "[[File:Kaohsiung Mass Rapid Transit Logo(Logo Only).svg|18px|link=Kaohsiung Rapid Transit]]", ["rail box format"] = "title", ["station format"] = { "%1 metro station", ["Central Park"] = "Central Park metro station (Taiwan)", ["Ciaotou"] = "Ciaotou station", ["Gangshan"] ="Gangshan station", ["Kaohsiung Main Station"] = "%1", ["Zuoying"] = "%1 HSR station", ["Hamasen"] = "%1 station", -- Circular light rail ["Lizihnei"] = x, ["Kaisyuan Rueitian"] = x, ["Cianjhen Star"] = x, ["Kaisyuan Jhonghua"] = x, ["Dream Mall"] = x, ["Commerce and Trade Park"] = x, ["Software Technology Park"] = x, ["Kaohsiung Exhibition Center"] = x, ["Cruise Terminal"] = x, ["Glory Pier"] = x, ["Love Pier"] = x, ["Dayi Pier-2"] = x, ["Penglai Pier-2"] = x }, ["lines"] = { ["_default"] = { ["title"] = "[[%1 line (Kaohsiung Metro)|%1 line]]" }, ["Red"] = { ["color"] = "e20b65", ["icon"] = "[[File:Kaohsiung MRT Red Line.svg|20px|link=Red line (Kaohsiung Metro)]]", ["left terminus"] = "Gangshan", ["right terminus"] = "Siaogang" }, ["Orange"] = { ["color"] = "faa73f", ["icon"] = "[[File:Kaohsiung Metro Orange Line.svg|20px|link=Orange line (Kaohsiung Metro)]]", ["left terminus"] = "Hamasen", ["right terminus"] = "Daliao" }, ["Circular"] = { ["title"] = "[[Circular light rail]]", ["short name"] = "Circular line", ["color"] = "7cbd52", ["icon"] = "[[File:Kaohsiung LRT Circular Line.svg|20px|link=Circular light rail]]", ["circular"] = 1, ["left terminus"] = "outer loop / anticlockwise", ["right terminus"] = "inner loop / clockwise" }, -- Future lines ["Yellow"] = { ["color"] = "ffc100", ["icon"] = "[[File:Kaohsiung Rapid Transit Yellow Line.svg|20px|link=Yellow line (Kaohsiung Metro)]]", ["left terminus"] = {"Cruise Terminal", "Cianjhen Senior High School"}, ["right terminus"] = "Dipu" }, -- Proposed ["Yanchao"] = { ["title"] = "[[Kaohsiung Metro#All projects|Yanchao line]]", ["color"] = "c100ff" }, ["Youchang"] = { ["title"] = "[[Kaohsiung Metro#All projects|Youchang line]]", ["color"] = "008583" }, ["Fongshan"] = { ["title"] = "[[Kaohsiung Metro#All projects|Fongshan line]]", ["color"] = "007fff" }, ["Green"] = { ["title"] = "[[Kaohsiung Metro#All projects|Green line]]", ["color"] = "50cb00" }, ["Foguangshan"] = { ["title"] = "[[Kaohsiung Metro#All projects|Foguangshan line]]", ["color"] = "aa34c0" }, ["Cijin"] = { ["title"] = "[[Kaohsiung Metro#All projects|Cijin line]]", ["color"] = "e10a65" }, }, ["aliases"] = { ["circular"] = "Circular", ["c"] = "Circular", ["orange"] = "Orange", ["o"] = "Orange", ["red"] = "Red", ["r"] = "Red", ["yellow"] = "Yellow", ["y"] = "Yellow" } } return p

The example module is Module:Adjacent stations/Kaohsiung Rapid Transit.

• The two required table entries are "station format" and "lines". The former is a table with data to form links to station articles, and the latter is a table containing a table for each line.
• "system title" is the text in the middle cell of the table header row.
• "station format" defines the default name format for station articles and exceptions. The first variable ("%1 metro station") is the default. Exceptions are listed as key–value pairs (e.g. "Zuoying"–"Zuoying HSR station"), where the key is the input name. The module displays the input name and links to the article with the formatted name, replacing "%1" with the input. Alternatively, the full wikilink and be entered. This can be used to have the display be different from the input.
• "lines" is where the lines are listed. The names here are used internally and not displayed, so choose a concise one.
• "line title" is the text displayed in the middle of each row indicating the line; "left terminus" is the default station name for the left side terminus, and "right terminus" is the default station name for the right side terminus.
• Each "color" entry is the colour of the line.

Below is Module:Adjacent stations/Taiwan High Speed Rail:

local x = "%1 station"

local p = {
	["system title"] = "[[Taiwan High Speed Rail]]",
	["system icon"] = "[[File:Taiwan High Speed Rail Logo(Log Only).svg|18px|link=Taiwan High Speed Rail|alt=Taiwan High Speed Rail]]",
	["system color"] =  "c35617",
	["name format"] = "color: #FFFFFF; background-color: #C35617;",
	["station format"] = {
		"%1 HSR station",
		["Taipei"] = "Taipei Main Station",
		["Nangang"] = x,
		["Banqiao"] = x
	},
	["lines"] = {
		["_default"] = {
			["title"] = "[[Taiwan High Speed Rail|THSR]]",
			["color"] = "c35617",
			["left terminus"] = "Nangang",
			["right terminus"] = "Zuoying"
		}
	}
}

return p

• x (defined in the first line) is a string used for formatting the station name. The variable x is used inside the "station format" table for the three articles where the title ends in "station" instead of "HSR station". This practice is optional but helpful when many articles fit a second pattern.
• The module recognises a virtual line named ["_default"]. The title and colour of this line is used for all lines unless overridden. Parameters are used in the absence of a specified line= in transclusion.

Hierarchy and list of parameters

1. The first layer of the table is data for the entire system, as well as output options.
2. Under the system table is the list of lines.
3. The third layer is data for a given line.
4. Each line can have 'types'. This can be either types of services or branches of the line.
5. The fifth layer is data for a given type.

If not specified, all keys and values are strings.

Main layer (1)

Parameter	Type	Used in {{Adjacent stations}}	Description
["lang"]	String	Yes	Values are "en-US" and "en-GB". If not set, "en-GB" is assumed.
["system title"]	String	Yes	Text in the middle cell of the header.
["system icon"]	String	Yes	Image used in the middle cell of the {{Adjacent stations}} header and by {{Rail icon}}.
["system icon format"]	String	No	Icon type, used by {{Rail icon}}. If specified and not "image", the value is passed to the function that implements {{Rail color box}}.
["system color"]	String	No	RGB hex triplet (three or six characters, like "BE2D2C" or "039"). Can be called by using only one parameter in {{Rail color}}.
["header stop noun"]	String	Yes	The noun after 'preceding' and 'following' in the left and right header cells. Default value is "station".
["name format"]	String	No	CSS for the header of {{Infobox station}} and anything else using the style function with |1=header. Values can be strings or nested tables, with the first level being for the line (whatever's in |style2= of {{Infobox station}}). The second level is currently unused. The first entry in a nested table with no key (i.e. with key 1) is the default.
["header background color"]	String	No	RGB hex triplet for {{Infobox station}} subheaders and anything else using the style function with |1=subheader. By default, it is a light gray. Values can be strings or nested tables, like those for "name format".
["header text color"]	String	No	RGB hex triplet for {{Infobox station}} subheaders and anything else using the style function with |1=subheader. By default, it is calculated based on the header background color. Values can be strings or nested tables, like those for ["name format"].
["station format"]	Table or string	Yes	Table containing station format strings. The first entry without a specified key (i.e. with the key being the number 1) is the default, and all other entries must have keys corresponding to the input. Format strings without wikilink brackets are converted to links, with the input (usually the station name) used as the displayed text. Tables can be nested within this table to indicate options based on the line and line type passed to this template. %1, %2 and %3 can be used in all strings regardless of the level of nesting to be replaced respectively by the station input, the line input (after alias replacement) and the type input (after alias replacement).
["lines"]	Table	Yes	Data table containing line tables.
["aliases"]	Table	Yes	Table containing aliases (as table keys) for lines (as values). All keys are lowercase, as the input is treated as case-insensitive by being lower-cased.

Station format table (2)

Parameter	Type	Used in {{Adjacent stations}}	Description
[1]	String	Yes	Default format.
["non-default station name"]	String or table	Yes	Format for a non-default station, or line-specific format table.

Line-specific format table (3)

Parameter	Type	Used in {{Adjacent stations}}	Description
[1]	String	Yes	Default format.
["line name"]	String or table	Yes	Format for a non-default station, or type-specific format table.

Type-specific format table (4)

Parameter	Type	Used in {{Adjacent stations}}	Description
[1]	String	Yes	Default format.
["type name"]	String	Yes	Format for a non-default station.

Line table (3)

A virtual line named ["_default"] can be added to set default values for all lines. Currently, this is available for three parameters.

Parameter	Type	Used in {{Adjacent stations}}	Description
["title"]	String	Yes	The text displayed in the middle cell, typically a link to the line's article. If not specified, then the data in ["_default"] is used (%1 in the default value is replaced by the input after alias replacement).
["short name"]	String	No	Abbreviated line name used by {{Rail color box}}.
["icon"]	String	No	Image used by {{Rail icon}}. If not specified, then the data in ["_default"] is used (%1 in the default value is replaced by the input after alias replacement).
["icon format"]	String	No	Icon type used by {{Rail icon}}. If specified and not "image", the value is passed to the function that implements {{Rail color box}}.
["color"]	String	Yes	RGB hex triplet. Lines fall back to the ["_default"] colour (if any) or the system's colour if they themselves do not have one; types fall back to the line's colour (if any), to the ["_default"] colour (if any) or to the system's colour. This colour is used in the second and fourth columns of {{Adjacent stations}}, and by {{Rail color box}} and {{Rail icon}} as the emphasised colour. By default, if a type and its line both have a colour, then the line's colour will be treated as the background colour (see next section) for the line name in the middle cell. This can be turned off by setting the type's background colour to "" or "transparent".
["background color"]	String	Yes	RGB hex triplet (three or six characters). This colour is optional and is only displayed behind the line name in the middle cell. The module adds transparency so that all text displayed over the background is legible.
["border color"]	String	No	RGB hex triplet used by {{Rail color box}}.
["text color"]	String	No	RGB hex triplet used by {{Rail color box}}.
["left terminus"]	String	Yes	The station which is usually the left terminus of the line. If there are multiple stations by default, the value should be a table containing numbered values (e.g. ["left terminus"] = {"Chesham", "Amersham"}). The key ["via"] in that table can be used to append 'via' and the value's station link.
["right terminus"]	String	Yes	The station which is usually the right terminus of the line; behaves like ["left terminus"].
["note-mid"]	String	Yes	Default small text below line and type names. Overridden by |note-mid= in transclusion.
["circular"]	Boolean	Yes	If the value is true then the termini will display without 'toward'/'towards'. May be overridden by type.
["oneway-left"]	Boolean	Yes	If the value is true then 'One-way operation' will display instead of the left terminus.
["oneway-right"]	Boolean	Yes	Right counterpart of oneway-left.
["types"]	Table	Yes	Table containing the line type tables.

Type table (5)

Parameter	Type	Used in {{Adjacent stations}}	Description
["title"]	String	Yes	The name of the line type. In {{Adjacent stations}}, this is displayed as normal-sized text below the line name in the middle cell; in {{Rail color box}}, for some options this is displayed after the line name, separated from it by a spaced en dash (this is also used for the nonstop text). To avoid displaying a type name, set this to "".
["short name"]	String	No	Abbreviated line name used by {{Rail color box}}.
["icon"]	String	No	Image used by {{Rail icon}}.
["icon format"]	String	No	Icon type used by {{Rail icon}}. If specified and not "image", the value is passed to the function that implements {{Rail color box}}.
["color"]	String	Yes	RGB hex triplet. Lines fall back to the ["_default"] colour (if any) or the system's colour if they themselves do not have one; types fall back to the line's colour (if any), to the ["_default"] colour (if any) or to the system's colour. This colour is used in the second and fourth columns of {{Adjacent stations}}, and by {{Rail color box}} and {{Rail icon}} as the emphasised colour. By default, if a type and its line both have a colour, then the line's colour will be treated as the background colour (see next section) for the line name in the middle cell. This can be turned off by setting the type's background colour to "" or "transparent".
["background color"]	String	Yes	RGB hex triplet (three or six characters). This colour is optional and is only displayed behind the line name in the middle cell. The module adds transparency so that all text displayed over the background is legible.
["border color"]	String	No	RGB hex triplet used by {{Rail color box}}.
["text color"]	String	No	RGB hex triplet used by {{Rail color box}}.
["left terminus"]	String	Yes	The station which is usually the left terminus of the line. Overrides line terminus. If there are multiple stations by default, the value should be a table containing numbered values (e.g. ["left terminus"] = {"Chesham", "Amersham"}). The key ["via"] in that table can be used to append 'via' and the value's station link.
["right terminus"]	String	Yes	The station which is usually the right terminus of the line; behaves like ["left terminus"].
["note-mid"]	String	Yes	Default small text below line and type names. Overridden by |note-mid= in transclusion.
["circular"]	Boolean	Yes	If the value is true then the termini will display without 'toward'/'towards'.

For editors

Disambiguating stations

Station links are generated using the station format part of the data module. Each data module defines a default case and then exceptions, if necessary. Station format is an array, similar to a switch with cases. Take Module:Adjacent stations/Incheon Subway, shown below:

local incheon = "%1 station (Incheon)"
local n = "font-size: 160%; font-family:sans-serif; font-weight: bolder; color: #FFFFFF; padding: 0.4em 4px; background-color: #"
local colors = {
	["1"] = "8cadcb",
	["2"] = "f06a00",
	["3"] = "777777",
}

local p = {
	["system title"] = "[[Incheon Subway]]",
	["system icon"] = "",
	["name format"] = {
	    ["1"] = n .. colors["1"],
	    ["2"] = n .. colors["2"],
	    ["3"] = n .. colors["3"],
	},
    ["header background color"] = colors,
    ["header text color"] = "ffffff",
	["station format"] = {
		"%1 station",
		["Arts Center"] = incheon,
		["Central Park"] = incheon,
		["Gyeongin National University of Education"] = "[[Gyeongin National University of Education station|Gyeongin Nat'l Univ. of Education]]",
		["Mansu"] = incheon,
		["Seongnam"] = incheon,
	},
	["lines"] = {
		["1"] = {
			["title"] = "[[Incheon Subway Line 1|Incheon Line 1]]",
			["color"] = colors["1"],
			["text color"] = "FFFFFF",
			["icon"] = "[[File:Incheon Metro Line 1.svg|16px|link=Incheon Subway Line 1]]",
			["left terminus"] = "Gyeyang",
			["right terminus"] = "Songdo Moonlight Festival Park",
		},
		["2"] = {
			["title"] = "[[Incheon Subway Line 2|Incheon Line 2]]",
			["color"] = colors["2"],
			["text color"] = "FFFFFF",
			["icon"] = "[[File:Incheon Metro Line 2.svg|16px|link=Incheon Subway Line 2]]",
			["left terminus"] = "Geomdan Oryu",
			["right terminus"] = "Unyeon",
		},
		["3"] = {
			["title"] = "[[Incheon Subway Line 3|Incheon Line 3]]",
			["color"] = colors["3"],
			["text color"] = "FFFFFF",
		}
	}
}

return p

The default case is "%1 station", listed first. The "%1" expands to whatever the passed name of the station is. "Bakchon" becomes Bakchon station. There are several exceptions. The two usual reasons for exceptions are disambiguation or presenting a name in a non-standard way. In this case, the Incheon Subway serves three stations whose names are disambiguated: Arts Center station (Incheon), Central Park station (Incheon), and Mansu station (Incheon). This is handled by specifying a key for each station and supplying a different format. Since all three are disambiguated the same way, you can define a local variable at the top of the module:

local incheon = "%1 station (Incheon)"

This can then be used with the exceptions:

["Arts Center"] = incheon,

Were it written out, it would look like this:

["Arts Center"] = "%1 station (Incheon)"

For developers

Suggestions are welcomed on the talk page.

To-do list

• Convert more systems from {{S-line}}, {{rail line}}, {{J-rserv}} and {{J-route}}
• Make an example module which contains all of the module's features, to avoid excessive examples in the documentation (maybe based on {{Rdt demo}})
• Allow direct replacement of {{Rail line}}?
• Before translation: figure out how to handle grammatical gender and inflection in various languages with the i18n table (e.g. these phrases)
• Allow inline sources to be added
• Figure out Wikidata integration (require sources on Wikidata end) :

  should be doable with P197, P5051, P1192 and P81. Bouzinac (talk) 09:17, 3 December 2021 (UTC)

• Add a short list of changes from {{S-line}}, for the convenience of the many editors who have used it in the last 11 years
  • changes in function (new structure, data inside module, circular and branch functionality changed, replacement of manual cell merging…)
  • parameter name changes (-left and -right, mostly – search {{S-line}} for {{{, maybe with the TemplateData generator, to make a list)

The above documentation is transcluded from Module:Adjacent stations/doc. (edit | history)
Editors can experiment in this module's sandbox (edit | diff) and testcases (edit | run) pages.
Subpages of this module.

require('strict')

local p = {}

local lang = 'en-GB' -- local default language

--	Below these comments: Internationalization table
--	How to translate this module (for languages without variants):
--	• Characters inside single and double quotation marks are called strings.
--	  The strings in this i18n table are used as output.
--	• Strings within square brackets are keys.
--	• Strings are concatenated (joined) with two dots.
--	• Set the string after «local lang =» to your language's code.
--	  Change the first key after "i18n" (usually "en-GB") to the same thing.
--	• For each string which is not inside a function, translate it directly.
--	• Strings with keys named "format" are Lua regular expressions.
--	  «()» is a match; «.+» means all characters; «%s+» means all spaces.
--	• For each string which is concatenated to the variable «var»,
--	  translate the phrase assuming that «var» will be a noun.
--	• Remove any unnecessary translations.

local i18n = require("Module:Adjacent stations/i18n")
local function getData(system, verify)
	if verify then
		local title = mw.title.new('Module:Adjacent stations/' .. system -- .. '/sandbox'
			)
		if not (title and title.exists) then return nil end
	end
	return require('Module:Adjacent stations/' .. system -- .. '/sandbox'
		)
end

local function getLine(data, lineN)
	if lineN then
		if data['aliases'] then
			lineN = data['aliases'][mw.ustring.lower(lineN)] or lineN
		end
		local default = data['lines']['_default'] or {}
		local line = data['lines'][lineN] or {}
		for k, v in pairs(default) do
			if v then line[k] = line[k] or v end
		end
		line['title'] = line['title'] and mw.ustring.gsub(line['title'], '%%1', lineN)
		return line, lineN
	end
end

local function getColor(data, system, line, Type, frame)
	if system then
		if line then return frame:expandTemplate{ title = system .. ' color', args = {line, ['branch'] = Type} } end
		return frame:expandTemplate{ title = system .. ' color' }
	else
		line = (getLine(data, line))
		local default = data['lines']['_default']
		if line or default then
			default = default or {}
			if not line then line = mw.clone(default) end
			local color = line['color'] or line['background color'] or default['color'] or default['background color'] or data['system color']
			local Type_value = Type and line['types'] and (line['types'][Type] and line['types'][Type]['color'])
			if Type_value then color = Type_value end
			return color
		end
		return (default and (default['color'] or default['background color']) or data['system color'] or '')
	end
end

local lineN, typeN

local function somethingMissing(name, key, formats)
	local formatKeys = {}
	for k in pairs(formats) do
		table.insert(formatKeys, k)
	end
	return name .. ' was "' .. key .. '" but neither an entry for it nor a default was found. Choices were: ' .. table.concat(formatKeys, ', ')
end

local function getStation(station, _Format)
	if type(_Format) == 'table' then
		local lineNformats = _Format
		_Format = lineNformats[lineN] or lineNformats[1]
		if not _Format then
			error(somethingMissing('lineN', lineN, lineNformats))
		elseif type(_Format) == 'table' then
			local typeNformats = _Format
			_Format = typeNformats[typeN] or typeNformats[1]
			if not _Format then
				error(somethingMissing('typeN', typeN, typeNformats))
			end
		end
	end
	if typeN then _Format = mw.ustring.gsub(_Format, '%%3', typeN) end
	if lineN then _Format = mw.ustring.gsub(_Format, '%%2', lineN) end
	return (mw.ustring.match(_Format, '%[%[.+%]%]')) and (mw.ustring.gsub(_Format, '%%1', station)) or table.concat({'[[', mw.ustring.gsub(_Format, '%%1', station), '|', station, ']]'})
end

local function getTerminusText(var, Format)
	local function subst(var1, var2)
		-- var1 is the terminus or table of termini; var2 is the key for the table of termini
		return type(var1) == 'string' and getStation(var1, (Format[var1] or Format[1]))
		or type(var1) == 'table' and #var1 > 0 and getStation(var1[var2], (Format[var1[var2]] or Format[1]))
		or ''
	end

	if Format then
		if type(var) == 'string' then
			return subst(var)
		elseif type(var) == 'table' and #var > 0 then
			local t = {subst(var, 1)}

			for i = 2, #var - 1 do
				t[i] = i18n[lang]['comma'](subst(var, i))
			end

			if #var > 1 then t[#var] = i18n[lang]['or'](subst(var, #var)) end
			if var['via'] then
				if i18n[lang]['via-first'] then
					table.insert(t, 1, i18n[lang]['via'](subst(var, 'via')))
				else
					table.insert(t, i18n[lang]['via'](subst(var, 'via')))
				end
			end

			return table.concat(t)
		else
			return ''
		end
	else
		return var or ''
	end
end

function p._main(_args) -- Arguments are processed here instead of the main function

	local yesno = require('Module:Yesno')
	local trimq = require('Module:Trim quotes')._trim

	local boolean = {
		['oneway-left'] = true,
		['oneway-right'] = true,
		['reverse'] = true,
		['reverse-left'] = true,
		['reverse-right'] = true
	}

	local args = {} -- Processed arguments
	local index = {} -- A list of addresses corresponding to number suffixes in the arguments

	for k, v in pairs(_args) do -- Maps each raw argument to processed arguments by string matching
		_args[k] = v:match('^%s*(.-)%s*$')
		if _args[k] and _args[k] ~= '' then
			local a = mw.ustring.match(k, '^(.*%D)%d+$') or k -- The parameter; address 1 can be omitted
			local b = tonumber(mw.ustring.match(k, '^.*%D(%d+)$')) or 1 -- The address for a given argument; address 1 can be omitted

			if boolean[a] then
				v = yesno(v)
			end

			if not args[b] then
				args[b] = {[a] = v}
				table.insert(index, b)
			elseif args[b][a] then
				return error(i18n[lang]['error_duplicate'](a .. b))
			else
				args[b][a] = v
			end
		end
	end
	table.sort(index)

	local function small(s, italic)
		return italic and '<div class="isA">' .. s .. '</div>'
			or '<div class="smA">' .. s .. '</div>'
	end

	local style = { -- Style for each cell type
		['header cell'] = 'class="hcA"|',
		['header midcell'] = 'colspan="3" class="hmA"|',
		['body cell'] = 'class="bcA"|',
		['body banner'] = 'class="bbA notheme" style="color:inherit;background-color:#',
	}

	local function rgb(var)
		if var:len() == 3 then
			return {tonumber(var:sub(1, 1), 16) * 17, tonumber(var:sub(2, 2), 16) * 17, tonumber(var:sub(2, 2), 16) * 17}
		elseif var:len() == 6 then
			return {tonumber(var:sub(1, 2), 16), tonumber(var:sub(3, 4), 16), tonumber(var:sub(5, 6), 16)}
		end
		return {}
	end

	local data = {} -- A table of data modules for each address
	local noclearclass = (((_args.noclear or '') ~= '') and ' adjacent-stations-noclear' or '')
	local wikitable = {'{| class="wikitable adjacent-stations' .. noclearclass .. '"'}

	for i, v in ipairs(index) do
		-- If an address has a system argument, indexes the data module
		data[v] = args[v]['system'] and getData(args[v]['system'])
		-- If an address has no system, the row uses data from the previous address
			or data[index[i - 1]]
			or (args[v]['header'] and getData(args[index[i+1]]['system']))
			or error(i18n[lang]['error_unknown'](args[v]['system']))

		local lang = data[v]['lang'] or lang

		if args[v]['system'] and not args[v]['hide-system'] then -- Header row
			local stop_noun = data[v]['header stop noun'] or i18n[lang]['stop_noun']
			table.insert(wikitable, table.concat({'\n|-',
				'\n! scope="col" ', style['header cell'], i18n[lang]['preceding'](stop_noun),
				'\n! scope="col" ', style['header midcell'], (data[v]['system icon'] and data[v]['system icon'] .. ' ' or ''), (data[v]['system title'] or ('[['.. args[v]['system'] ..']]')),
				'\n! scope="col" ', style['header cell'], i18n[lang]['following'](stop_noun)
			}))
			table.insert(wikitable, '')
			table.insert(wikitable, '')
			table.insert(wikitable, '')
		end

		if args[v]['header'] then -- Subheader
			table.insert(wikitable, '\n|-\n!colspan="5" class="hmA"|'.. args[v]['header'])
			table.insert(wikitable, '')
			table.insert(wikitable, '')
			table.insert(wikitable, '')
		end

		if args[v]['line'] or args[v]['left'] or args[v]['right'] or args[v]['nonstop'] then
			if not args[v]['line'] and i > 1 and not args[v]['system'] then
				args[v]['line'] = args[index[i - 1]]['line']
			end

			lineN = args[v]['line'] or '_default'
			typeN = args[v]['type']
			if data[v]['aliases'] then
				lineN = data[v]['aliases'][mw.ustring.lower(lineN)] or lineN
				if typeN then typeN = data[v]['aliases'][mw.ustring.lower(typeN)] or typeN end
			end

			-- get the line table
			local line = data[v]['lines'] and (mw.clone(data[v]['lines'][lineN]) or error(i18n[lang]['error_unknown'](args[v]['line']))) or error(i18n[lang]['error_line'])
			local default = data[v]['lines']['_default'] or {}
			line['title'] = line['title'] or default['title'] or ''
			line['title'] = mw.ustring.gsub(line['title'], '%%1', lineN)

			-- cell across row for non-stop service
			if args[v]['nonstop'] then
				table.insert(wikitable,
					table.concat({'\n|-\n|colspan="5" ',
						style['body cell'],
						((args[v]['nonstop'] == 'former') and i18n[lang]['nonstop_past'] or i18n[lang]['nonstop_present'])(p._box({data = data[v], line = lineN, Type = typeN, inline = 'yes'}))
					})
				)
				table.insert(wikitable, '')
				table.insert(wikitable, '')
				table.insert(wikitable, '')
			else
				local Format = data[v]['station format'] or i18n[lang]['error_format']

				local color, color_2, background_color, circular
				local Type = line['types'] and line['types'][typeN] -- get the line type table

				if Type then
					if Type['color'] then
						-- line color is used as background if there is no background color in the line type table
						background_color = Type['background color'] or line['color']
						color = Type['color']
						color_2 = Type['color2'] or color
					else
						background_color = Type['background color'] or line['background color']
						color = line['color'] or default['color'] or ''
						color_2 = line['color2'] or color
					end
					if Type['circular'] then
						-- Type may override the circular status of the line
						circular = Type['circular']
					end
				else
					background_color = line['background color']
					color = line['color'] or default['color'] or ''
					color_2 = line['color2'] or color
					circular = line['circular']
				end

				-- Alternate termini can be specified based on type
				local sideCell = {true, true}
				for i, b in ipairs({'left', 'right'}) do
					if not args[v][b] then -- If no station is given on one side, the station is assumed to be the terminus on that side
						local _through = args[v]['through-' .. b] or args[v]['through']
						local _through_data = getLine(data[v], _through)
						if _through_data then _through = _through_data['title'] or _through end
						sideCell[i] = _through and "''" .. i18n[lang]['through'](trimq(_through)) .. "''"
							or "''" .. trimq((args[v]['reverse-' .. b]
							or args[v]['reverse']) and i18n[lang]['reverse']
							or i18n[lang]['terminus']) .. "''"
					else
						local terminusT
						local terminusN = Type and Type[b .. ' terminus'] or line[b .. ' terminus']

						-- If the terminus table has more than one numbered key or has the via key then the table shows only the default termini, since terminusN[2] cannot be used and terminusN[via] is reserved
						if type(terminusN) == 'string' or (type(terminusN) == 'table' and (terminusN[2] or terminusN['via'])) then
							if args[v]['to-' .. b] then
								terminusT = args[v]['to-' .. b]
								local _or = mw.ustring.match(terminusT, i18n[lang]['or-format'])
								if _or then
									terminusT = mw.ustring.gsub(terminusT, i18n[lang]['or-format'], '\127_OR_\127')
									terminusT = mw.ustring.gsub(terminusT, i18n[lang]['comma-format'], '\127_OR_\127')
								end
								local _via = (mw.ustring.match(terminusT, i18n[lang]['via-format']))
								if _via then
									terminusT = mw.ustring.gsub(terminusT, i18n[lang]['via-format'], '')
									terminusT = mw.text.split(terminusT, '\127_OR_\127')
									terminusT['via'] = _via
								elseif _or then
									terminusT = mw.text.split(terminusT, '\127_OR_\127')
								end
							else
								terminusT = terminusN
							end
						elseif type(terminusN) == 'table' then
							terminusT = terminusN[args[v]['to-' .. b]] or terminusN[args[v]['to']] or terminusN[1]
						end

						local mainText = args[v]['note-' .. b] and getTerminusText(args[v][b], Format) .. small(args[v]['note-' .. b]) or getTerminusText(args[v][b], Format)

						local subText = (args[v]['oneway-' .. b] or line['oneway-' .. b]) and i18n[lang]['oneway']
							or args[v][b] == terminusT and i18n[lang]['terminus']
							or circular and terminusT
							or i18n[lang]['towards'](getTerminusText(terminusT, Format))
						subText = small(subText, true)

						sideCell[i] = mainText .. subText
					end
				end

				table.insert(wikitable, '\n|-')
				table.insert(wikitable, '\n|' .. style['body cell'] .. sideCell[1])
				table.insert(wikitable, table.concat({'\n|', style['body banner'], color, '"|',
					'\n|', (background_color and 'class="bcA" style="background-color:rgba(' .. table.concat(rgb(background_color), ',') .. ',.2)"|' or style['body cell']), line['title'],

					-- Type; table key 'types' in subpages (datatype table, with strings as keys). If table does not exist then the input is displayed as the text
					(typeN and '<div>' .. (Type and Type['title'] or typeN) .. '</div>' or ''),

					-- Note-mid; table key 'note-mid' in subpages. Overridden by user input
					((args[v]['note-mid'] and small(args[v]['note-mid'])) or (Type and Type['note-mid'] and small(Type['note-mid'])) or (line['note-mid'] and small(line['note-mid'])) or ''),

					-- Transfer; uses system's station link table
					(args[v]['transfer'] and small('transfer at ' .. getTerminusText(args[v]['transfer'], Format), true) or ''),

					'\n|', style['body banner'], color_2, '"|'}))
				table.insert(wikitable, '\n|' .. style['body cell'] .. sideCell[2])
			end
		end

		if args[v]['note-row'] then -- Note
			if args[v]['note-row']:match('^%s*<tr') or args[v]['note-row']:match('^%s*%|%-') then
				table.insert(wikitable, '\n' .. args[v]['note-row'])
			else
				table.insert(wikitable, '\n|-\n|colspan="5" ' .. style['body cell'] .. args[v]['note-row'])
			end
			table.insert(wikitable, '')
			table.insert(wikitable, '')
			table.insert(wikitable, '')
		end
	end

	local function combine(t, n)
		if t[n + 4] ~= '' and t[n + 4] == t[n] then
			t[n + 4] = '' -- The cell in the next row is deleted
			local rowspan = 2
			while t[n + rowspan * 4] == t[n] do
				t[n + rowspan * 4] = ''
				rowspan = rowspan + 1
			end
			t[n] = mw.ustring.gsub(t[n], '\n|class="', '\n|rowspan="' .. rowspan .. '" class="')
		end
	end

	local M = #wikitable
	for i = 3, M, 4 do combine(wikitable, i) end
	for i = 4, M, 4 do combine(wikitable, i) end
	for i = 5, M, 4 do combine(wikitable, i) end

	table.insert(wikitable, '\n|}')

	return table.concat(wikitable)
end

local getArgs = require('Module:Arguments').getArgs

local function makeInvokeFunction(funcName)
	-- makes a function that can be returned from #invoke, using
	-- [[Module:Arguments]]
	return function (frame)
		local args = getArgs(frame, {parentOnly = true})
		return p[funcName](args, frame)
	end
end

local function makeTemplateFunction(funcName)
	-- makes a function that can be returned from #invoke, using
	-- [[Module:Arguments]]
	return function (frame)
		local args = getArgs(frame, {frameOnly = true})
		return p[funcName](args, frame)
	end
end

p.main = makeInvokeFunction('_main')

function p._color(args, frame)
	local data = args.data
	if args[1] or data then
		data = data or getData(args[1], true)
		if not data then return getColor(nil, args[1], args[2], args[3], frame) end
		return getColor(data, nil, args[2], args[3])
	end
end

p.color = makeInvokeFunction('_color')

function p._box(args, frame)
	local system = args[1] or args.system
	lineN = args[2] or args.line
	if not (system or lineN) then return '' end
	local line, Type, line_data
	local inline = args[3] or args.inline
	typeN = args.type
	local data = args.data
	if system or data then
		data = data or getData(system, true)
		local color
		if data then
			local default = data['lines']['_default'] or {}
			line, lineN = getLine(data, lineN)
			if typeN then
				typeN = data['aliases'] and data['aliases'][mw.ustring.lower(typeN)] or typeN
				Type = line['types'] and line['types'][typeN] and line['types'][typeN]['title'] or typeN
			end
			color = getColor(data, nil, lineN, typeN)
			if inline ~= 'box' then
				line_data = line or error(i18n[lang]['error_unknown'](lineN))
				line = line_data['title'] or default['title'] or error(i18n[lang]['error_missing']('title'))
				line = mw.ustring.gsub(line, '%%1', lineN)
			end
		else
			color = getColor(nil, system, lineN, typeN, frame)
			if inline ~= 'box' then
				line = frame:expandTemplate{ title = system .. ' lines', args = {lineN, ['branch'] = typeN} }
				if mw.text.trim(line) == '' then return error(i18n[lang]['error_unknown'](lineN)) end
			end
			Type = typeN
		end

		local result

		if Type and Type ~= '' and inline ~= 'box' then
			if line == '' then
				line = Type
			else
				result = ' – ' .. Type
			end
		end
		if args.note then result = (result or '') .. ' ' .. args.note end
		result = result or ''

		if not inline then -- [[Template:Legend]]
			result = '<div class="legend" style="page-break-inside:avoid;break-inside:avoid-column"><span class="legend-color" style="display:inline-block;min-width:1.25em;height:1.25em;line-height:1.25;margin:1px 0;border:1px solid black;color:inherit;background-color:#' .. color .. '"> </span> ' .. line .. result .. '</div>'
		elseif inline == 'yes' then
			result = '<span style="color:inherit;background-color:#' .. color .. ';border:1px solid #000">    </span>&nbsp;' .. line .. result
		elseif inline == 'box' then
			result = '<span style="color:inherit;background-color:#' .. color .. ';border:1px solid #000">    </span>' .. result
		elseif inline == 'link' then
			local link = args.link or mw.ustring.match(line, '%[%[([^%[:|%]]+)[|%]]')
			if link then
				result = '[[' .. link .. '|<span style="color:inherit;background-color:#' .. color .. ';border:1px solid #000">    </span>]]' .. result
			else
				result = '<span style="color:inherit;background-color:#' .. color .. ';border:1px solid #000">    </span>' .. result
			end
		elseif inline == 'square' then
			result = '<span style="color:#' .. color .. ';line-height:initial">■</span>&nbsp;' .. line .. result
		elseif inline == 'lsquare' then
			local link = args.link or mw.ustring.match(line, '%[%[([^%[:|%]]+)[|%]]')
			if link then
				result = '[[' .. link .. '|<span style="color:#' .. color .. ';line-height:initial">■</span>]]'
			else
				result = '<span style="color:#' .. color .. ';line-height:initial">■</span>'
			end
		elseif inline == 'dot' then
			result = '<span style="color:#' .. color .. ';line-height:initial">●</span> ' .. line .. result
		elseif inline == 'ldot' then
			local link = args.link or mw.ustring.match(line, '%[%[([^%[:|%]]+)[|%]]')
			if link then
				result = '[[' .. link .. '|<span style="color:#' .. color .. ';line-height:initial">●</span>]]'
			else
				result = '<span style="color:#' .. color .. ';line-height:initial">●</span>'
			end
		elseif inline == 'small' then
			result = '<span style="color:inherit;background-color:#' .. color .. '"> </span>' .. ' ' .. line .. result
		else
			local yesno = require("Module:Yesno")
			local link = args.link or mw.ustring.match(line, '%[%[([^%[:|%]]+)[|%]]')
			local border_color, text_color
			local color_box = data['color box format'] or data['rail box format'] or {}
			if line_data then
				if line_data['types'] and line_data['types'][typeN] then
					local Type_data = line_data['types'][typeN]
					border_color = Type_data['border color'] or line_data['border color'] or color
					text_color = Type_data['text color'] or line_data['text color']
					if color_box == 'title' and not args[4] then
						lineN = Type_data['short name'] or line_data['short name'] or require('Module:Delink')._delink{line}
					else
						lineN = Type_data['short name'] or line_data['short name'] or lineN
					end
				else
					border_color = line_data['border color'] or color
					text_color = line_data['text color']
					if color_box == 'title' and not args[4] then
						lineN = line_data['short name'] or require('Module:Delink')._delink{line}
					else
						lineN = line_data['short name'] or lineN
					end
				end
			else
				border_color = color
			end
			text_color = text_color and '#' .. text_color or require('Module:Color contrast')._greatercontrast{color}
			local bold = ';font-weight:bold'
			if (yesno(args.bold) == false) then bold = '' end
			if inline == 'route' then -- [[Template:RouteBox]]
				if link then
					result = '<span style="color:inherit;background-color:#' .. color .. ';border:.075em solid #' .. border_color .. ';padding:0 .3em">[[' .. link .. '|<span style="color:' .. text_color .. bold .. ';font-size:inherit;white-space:nowrap">' .. lineN .. '</span>]]</span>'
				else
					result = '<span style="background-color:#' .. color .. ';border:.075em solid #' .. border_color .. ';padding:0 .3em;color:' .. text_color .. bold .. ';font-size:inherit;white-space:nowrap">' .. lineN .. '</span>'
				end
			elseif inline == 'croute' then -- [[Template:Bahnlinie]]
				if link then
					result = '<span style="color:inherit;background-color:#' .. color .. ';border:.075em solid #' .. border_color .. ';border-radius:.5em;padding:0 .3em">[[' .. link .. '|<span style="color:' .. text_color .. bold .. ';font-size:inherit;white-space:nowrap">' .. lineN .. '</span>]]</span>'
				else
					result = '<span style="color:inherit;background-color:#' .. color .. ';border:.075em solid #' .. border_color .. ';border-radius:.5em;padding:0 .3em;color:' .. text_color .. bold .. ';font-size:inherit;white-space:nowrap">' .. lineN .. '</span>'
				end
			elseif inline == 'xroute' then -- [[Template:Bahnlinie]]
				if link then
					result = '<span style="border:.075em solid #' .. border_color .. ';border-radius:.5em;padding:0 .3em">[[' .. link .. '|<span style="color:#' .. color .. bold .. ';font-size:inherit;white-space:nowrap">' .. lineN .. '</span>]]</span>'
				else
					result = '<span style="border:.075em solid #' .. border_color .. ';border-radius:.5em;padding:0 .3em;color:#' .. color .. bold .. ';font-size:inherit;white-space:nowrap">' .. lineN .. '</span>'
				end
			elseif inline == 'broute' then
				if link then
					result = '<span style="color:inherit;background-color:#' .. color .. ';border:.075em solid #000;padding:0 .3em">[[' .. link .. '|<span style="color:' .. text_color .. bold .. ';font-size:inherit;white-space:nowrap">' .. lineN .. '</span>]]</span>'
				else
					result = '<span style="background-color:#' .. color .. ';border:.075em solid #000;padding:0 .3em;color:' .. text_color .. bold .. ';font-size:inherit;white-space:nowrap">' .. lineN .. '</span>'
				end
			else -- [[Template:Legend]] (fallback; duplication to simplify logic)
				result = '<div class="legend" style="page-break-inside:avoid;break-inside:avoid-column"><span class="legend-color" style="display:inline-block;min-width:1.25em;height:1.25em;line-height:1.25;margin:1px 0;border:1px solid black;color:inherit;background-color:#' .. color .. '"> </span> ' .. line .. result .. '</div>'
			end
		end

		result = mw.ustring.gsub(result, ':%s*#transparent', ':transparent')

		return result
	end
end

p.box = makeInvokeFunction('_box')

function p._icon(args, frame)
	local system = args[1] or args.system
	local data = args.data

	if not system and not data then
		return
	end

	data = data or getData(system)

	local line, line_name = getLine(data, args[2] or args.line)

	local icon
	local icon_format

	if line then
		local line_type = args[3] or args.type
		if line_type then
			line_type = data.aliases and  data.aliases[mw.ustring.lower(line_type)] or line_type
			line_type = line.types and line.types[line_type] -- If there's no type table or entry for this type, then it can't have its own icon
			icon_format = line_type['icon format'] or data['type icon format']

			if line_type.icon then
				icon = line_type.icon
			end
		end

		if not icon then
			icon = line.icon
		end

		-- Only if there is no icon use the icon_format.
		if not icon and not icon_format then
			icon_format = line['icon format'] or data['line icon format']
		end

		local default = data.lines._default or {}
		if icon and string.find(icon, "%%1") and default and default.icon then
			icon = mw.ustring.gsub(default.icon, '%%1', line_name)
		end

	end

	if not icon then
		icon = data['system icon']
	end

	if not icon_format then
		icon_format = data['system icon format']
	end

	if icon_format then
		if icon_format ~= 'image' then
			icon = p._box({data = data, [2] = (args[2] or args.line), [3] = icon_format, type = (args[3] or args.type), bold = args.bold, link = args.link}, frame)

			if args.name then
				if line and line.title then
					return icon .. " " .. line.title
				end
				return icon .. " " .. data["system title"]
			end
		end
	end

	local size = args.size
	if size then
		if mw.ustring.match(size, '%d$') then
			size = '|' .. size .. 'px'
		else
			size = '|' .. size
		end
		-- Upright values are to be disabled until there is use of upright scaling in subpages; doesn't seem to work anyway as of 2018-08-10
		local regex = {
			'|%s*%d*x?%d+px%s*([%]|])', -- '|%s*upright=%d+%.?%d*%s*([%]|])', '|%s*upright%s*([%]|])'
		}
		if mw.ustring.match(icon, regex[1]) then
			icon = mw.ustring.gsub(icon, regex[1], size .. '%1')
	--	elseif mw.ustring.match(icon, regex[2]) then
	--		icon = gsub(icon, regex[2], size .. '%1')
	--	elseif mw.ustring.match(icon, regex[3]) then
	--		icon = gsub(icon, regex[3], size .. '%1')
		else
			icon = mw.ustring.gsub(icon, '(%[%[[^%]|]+)([%]|])', '%1' .. size .. '%2')
		end
	end

	local link = args.link
	if link then
		if mw.ustring.match(icon, '|%s*link=[^%]|]*[%]|]') then
			icon = mw.ustring.gsub(icon, '|%s*link=[^%]|]*([%]|])', '|link=' .. link .. '%1')
		else
			icon = mw.ustring.gsub(icon, '(%[%[[^%]|]+)([%]|])', '%1|link=' .. link .. '%2')
		end
	end

	local alt = args.alt or link
	if alt then
		if mw.ustring.match(icon, '|%s*alt=[^%]|]*[%]|]') then
			icon = mw.ustring.gsub(icon, '|%s*alt=[^%]|]*([%]|])', '|alt=' .. alt .. '%1')
		else
			icon = mw.ustring.gsub(icon, '(%[%[[^%]|]+)([%]|])', '%1|alt=' .. alt .. '%2')
		end
	end

	if args.name then
		if line and line.title then
			return icon .. " " .. line.title
		end
		return icon .. " " .. data["system title"]
	end
	return icon
end

p.icon = makeInvokeFunction('_icon')
p['rail icon'] = makeTemplateFunction('_icon')

function p._line(args, frame)
	local system = args[1] or args.system
	local line = args[2] or args.line
	if not line then return '' end
	local Type = args[3] or args.type
	local data = args.data
	if system or data then
		data = data or getData(system, true)
		if data then
			line = (getLine(data, line)) or error(i18n[lang]['error_unknown'](line))
			if Type then
				Type = data['aliases'] and data['aliases'][mw.ustring.lower(Type)] or Type
				Type = line['types'] and line['types'][Type] and line['types'][Type]['title'] or Type
			end
			line = line['title'] or error(i18n[lang]['error_missing']('title'))
		else
			line = frame:expandTemplate{ title = system .. ' lines', args = {line, ['branch'] = Type} }
			if mw.text.trim(line) == '' then return error(i18n[lang]['error_unknown'](lineN)) end
		end

		if Type and Type ~= '' then
			if line == '' then
				line = Type
			else
				line = line .. ' – ' .. Type
			end
		end
		return line
	end
end

p.line = makeInvokeFunction('_line')

function p._shortline(args, frame)
	local system = args[1] or args.system
	lineN = args[2] or args.line
	if not (system or lineN) then return '' end
	local line, Type, line_data
	typeN = args.type
	local data = args.data
	if system or data then
		data = data or getData(system, true)
		if data then
			local default = data['lines']['_default'] or {}
			line, lineN = getLine(data, lineN)
			if typeN then
				typeN = data['aliases'] and data['aliases'][mw.ustring.lower(typeN)] or typeN
				Type = line['types'] and line['types'][typeN] and line['types'][typeN]['title'] or typeN
			end
			line_data = line or error(i18n[lang]['error_unknown'](lineN))
			line = line_data['title'] or default['title'] or error(i18n[lang]['error_missing']('title'))
			line = mw.ustring.gsub(line, '%%1', lineN)
		else
			line = frame:expandTemplate{ title = system .. ' lines', args = {lineN, ['branch'] = typeN} }
			if mw.text.trim(line) == '' then return error(i18n[lang]['error_unknown'](lineN)) end
			Type = typeN
		end

		local result

		if Type and Type ~= '' then
			if line == '' then
				line = Type
			else
				result = ' – ' .. Type
			end
		end
		if args.note then result = (result or '') .. ' ' .. args.note end
		result = result or ''

		local link = args.link or mw.ustring.match(line, '%[%[([^%[:|%]]+)[|%]]')
		if line_data then
			if line_data['types'] and line_data['types'][typeN] then
				local Type_data = line_data['types'][typeN]
				lineN = Type_data['short name'] or line_data['short name'] or lineN
			else
				lineN = line_data['short name'] or lineN
			end
		end
			
		if link then
			result = '[[' .. link .. '|' .. lineN .. ']]'
		else
			result = lineN
		end
	
		result = mw.ustring.gsub(result, ':%s*#transparent', ':transparent')

		return result
	end
end

p.shortline = makeInvokeFunction('_shortline')

function p._station(args, frame)
	local system = args[1] or args.system
	local station = args[2] or args.station
	if not station then return '' end
	lineN = args[3] or args.line
	typeN = args[4] or args.type
	local data = args.data
	if system or data then
		data = data or getData(system, true)
		if data then
			local _Format = data['station format'][station] or data['station format'][1]
			if _Format then
				if data['aliases'] then
					if lineN then
						lineN = data['aliases'][mw.ustring.lower(lineN)] or lineN
					end
					if typeN then
						typeN = data['aliases'][mw.ustring.lower(typeN)] or typeN
					end
				end
				station = getStation(station, _Format)
			else
				station = station or ''
			end
		else
			station = frame:expandTemplate{ title = system .. ' stations', args = {['station'] = station, ['line'] = lineN, ['branch'] = typeN} }
		end

		return station
	end
end

p.station = makeInvokeFunction('_station')
p['station link'] = makeTemplateFunction('_station')

function p._terminusTable(args, frame)
	local system = args[1] or args.system
	lineN = args[2] or args.line
	local side = mw.ustring.sub(mw.ustring.lower(args[3] or args.side or ''), 1, 1)
	typeN = args.type
	local prefix = (side == 'r') and 'right' or 'left'
	local data = args.data

	if system or data then
		data = data or getData(system, true)
	end
	if data then
		local line = getLine(data, lineN) or error(i18n[lang]['error_unknown'](lineN))
		if typeN and data and data['aliases'] then typeN = data['aliases'][mw.ustring.lower(typeN)] or typeN end
		local Type = line['types'] and line['types'][typeN]

		local circular
		if Type then
			if Type['circular'] then
				-- Type may override the circular status of the line
				circular = Type['circular']
			end
		else
			circular = line['circular']
		end

		return Type and Type[prefix .. ' terminus'] or line[prefix .. ' terminus'], data['station format'] or i18n[lang]['error_format'], circular
	else
		local terminus = frame:expandTemplate{ title = 'S-line/' .. system .. ' ' .. prefix .. '/' .. lineN }
		return mw.ustring.gsub(terminus, '{{{type}}}', typeN)
	end
end

function p._terminus(args, frame)
	local var, Format, circular = p._terminusTable(args, frame)

	return circular and var or getTerminusText(var, Format)
end

p.terminus = makeInvokeFunction('_terminus')

function p._style(args, frame)
	local style = args[1] or args.style
	local system = args[2] or args.system
	local line = args[3] or args.line
	local station = args[4] or args.station
	local result = {}
	local data = args.data
	local default = 'background-color:#efefef' -- Default background color for {{Infobox station}}
	if system or data then
		data = data or getData(system, true)
	end
	if data then
		local function getValue(var)
			if type(var) == 'table' then
				var = var[line] or var[1]
				if type(var) == 'table' then
					var = var[station] or var[1]
				end
			end
			if var ~= '' then return var end
		end

		if style == 'header' then
			local tmp = data['name format'] and getValue(data['name format'])
			if tmp then table.insert(result, tmp) end
		elseif style == 'subheader' then
			local tmp = data['header background color'] and getValue(data['header background color'])
			if tmp then
				table.insert(result, 'background-color:#' .. tmp)
				local color = data['header text color'] and getValue(data['header text color'])
				if color then
					table.insert(result, 'color:#' .. color)
				else
					local greatercontrast = require('Module:Color contrast')._greatercontrast
					if greatercontrast{tmp} == '#FFFFFF' then table.insert(result, 'color:#FFFFFF') end
				end
			else
				table.insert(result, default)
				local color = data['header text color'] and getValue(data['header text color'])
				if color then table.insert(result, 'color:#' .. color) end
			end
		end
		result = table.concat(result, ';')
	elseif system then
		local title = 'Template:' .. system .. ' style'
		local titleObj = mw.title.new(title)
		if titleObj and titleObj.exists then
			local tmp
			if style == 'header' then
				tmp = frame:expandTemplate{ title = title, args = {'name_format', line, station} }
				if tmp ~= '' then table.insert(result, tmp) end
			elseif style == 'subheader' then
				tmp = frame:expandTemplate{ title = title, args = {'thbgcolor', line, station} }
				if tmp ~= '' then
					table.insert(result, 'background-color:#' .. tmp)
					local color = frame:expandTemplate{ title = title, args = {'thcolor', line, station} }
					if color ~= '' then
						table.insert(result, 'color:#' .. color)
					else
						local ratio = require('Module:Color contrast')._ratio
						if ratio{tmp, '222222'} < 4.5 then table.insert(result, 'color:#FFFFFF') end -- 222222 is the default text color in Vector
					end
				else
					table.insert(result, default)
					tmp = frame:expandTemplate{ title = title, args = {'thcolor', line, station} }
					if tmp ~= '' then
						table.insert(result, 'color:#' .. tmp)
					end
				end
			end
			result = table.concat(result, ';')
		else
			if style == 'subheader' then
				result = default
			else
				result = ''
			end
		end
	else
		if style == 'subheader' then
			result = default
		else
			result = ''
		end
	end

	return result
end

function p.style(frame)
	local args = getArgs(frame, {frameOnly = true})
	return p._style(args, frame)
end

function p.convert(frame)
	local args = frame.args
	local code = mw.text.split(mw.ustring.gsub(args[1], '^%s*{{(.*)}}%s*$', '%1'), '%s*}}%s*{{%s*')
	local system
	local group = tonumber(args.offset or 0) or 0
	local firstgroup = group + 1
	local delete = {
		['s-rail'] = true,
		['s-rail-next'] = true,
		['s-rail-national'] = true,
		['s-start'] = true,
		['s-rail-start'] = true,
		['start'] = true,
		['s-end'] = true,
		['end'] = true
	}
	local order = {
		'line', 'left', 'right', 'to-left', 'to-right',
		'oneway-left', 'oneway-right', 'through-left', 'through-right',
		'reverse', 'reverse-left', 'reverse-right',
		'note-left', 'note-mid', 'note-right', 'transfer'
		-- circular: use module subpage
		-- state: not implemented
	}
	local replace = {
		['previous'] = 'left',
		['next'] = 'right',
		['type'] = 'to-left',
		['type2'] = 'to-right',
		['branch'] = 'type',
		['note'] = 'note-left',
		['notemid'] = 'note-mid',
		['note2'] = 'note-right',
		['oneway1'] = 'oneway-left',
		['oneway2'] = 'oneway-right',
		['through1'] = 'through-left',
		['through2'] = 'through-right'
	}
	local remove_rows = {}
	local data = {}
	local noclear = false
	for i, v in ipairs(code) do
		code[i] = mw.ustring.gsub(code[i], '\n', ' ')
		local template = mw.ustring.lower(mw.text.trim(mw.ustring.match(code[i], '^[^|]+')))
		code[i] = mw.ustring.match(code[i], '(|.+)$')
		if (mw.ustring.match(code[i] or '', 'noclear%s*=%s*[a-z]')) then
			noclear = true
		end
		if template == 's-line' then
			data[i] = {}
			local this_system = mw.text.trim(mw.ustring.match(code[i], '|%s*system%s*=([^|]+)'))
			code[i] = mw.text.split(code[i], '%s*|%s*')
			for m, n in ipairs(code[i]) do
				local tmp = mw.text.split(n, '%s*=%s*')
				if tmp[3] then
					tmp[2] = mw.ustring.gsub(n, '^.-%s*=', '')
				end
				tmp[1] = replace[tmp[1]] or tmp[1]
				if tmp[2] then
					-- checks for matching brackets
					local curly = select(2, mw.ustring.gsub(tmp[2], "{", ""))-select(2, mw.ustring.gsub(tmp[2], "}", ""))
					local square = select(2, mw.ustring.gsub(tmp[2], "%[", ""))-select(2, mw.ustring.gsub(tmp[2], "%]", ""))
					if not (curly == 0 and square == 0) then
						local count = mw.clone(m)+1
						while not (curly == 0 and square == 0) do
							tmp[2] = tmp[2]..'|'..code[i][count]
							curly = curly+select(2, mw.ustring.gsub(code[i][count], "{", ""))-select(2, mw.ustring.gsub(code[i][count], "}", ""))
							square = square+select(2, mw.ustring.gsub(code[i][count], "%[", ""))-select(2, mw.ustring.gsub(code[i][count], "%]", ""))
							code[i][count] = ''
							count = count+1
						end
					end
					data[i][tmp[1]] = tmp[2]
				end
			end
			if (this_system ~= system) or (not system) then
				system = this_system
				data[i]['system'] = system
			else
				data[i]['system'] = nil
			end
			local last = data[i-1] or data[i-2] or data[i-3]
			if last then
				for r, s in pairs({
					['hide1'] = {'left', 'to-left', 'note-left', 'oneway-left'},
					['hide2'] = {'right', 'to-right', 'note-right', 'oneway-right'},
					['hidemid'] = {'type', 'note-mid'}
					}) do
					if data[i][r] then
						for m, n in ipairs(s) do
							if not data[i][n] then
								data[i][n] = last[n]
							end
						end
					end
				end
			end
			code[i] = {}
			local X = '|'
			local Y = (i+group)..'='
			if data[i]['system'] then
				table.insert(code[i], '|system')
				table.insert(code[i], Y)
				table.insert(code[i], data[i]['system'])
				table.insert(code[i], '\n')
			end
			for m, n in ipairs(order) do
				if data[i][n] then
					table.insert(code[i], X)
					table.insert(code[i], n)
					table.insert(code[i], Y)
					table.insert(code[i], data[i][n])
				end
			end
			code[i] = table.concat(code[i])
		elseif template == 's-note' then
			code[i] = mw.ustring.gsub(code[i], '|%s*text%s*=', '|header'..i+group..'=')
			code[i] = mw.ustring.gsub(code[i], '|%s*wide%s*=[^|]*', '')
		elseif template == 's-text' then
			code[i] = mw.ustring.gsub(code[i], '|%s*text%s*=', '|note-row'..i+group..'=')
		elseif delete[template] then
			code[i] = ''
			table.insert(remove_rows, 1, i) -- at the start, so that the rows are deleted in reverse order
			group = group-1
		end
	end
	for i, v in ipairs(remove_rows) do
		table.remove(code, v)
	end
	code = table.concat(code, '\n')
	local t = {'{{Adjacent stations' .. (noclear and '|noclear=y\n' or ''), '\n}}'}
	system = mw.ustring.match(code, '|system(%d*)=')
	code = mw.ustring.gsub(code, '\n\n+', '\n')
	if tonumber(system) > firstgroup then
		-- If s-line isn't the first template then the system will have to be moved to the top
		system = mw.ustring.match(code, '|system%d*=([^|]*[^|\n])')
		code = mw.ustring.gsub(code, '|system%d*=[^|]*', '')
		code = '\n|system'..firstgroup..'='..system..code
	elseif not mw.ustring.match(code, '^[^{%[]*|[^=|]+2=') then
		-- If there's only one parameter group then there's no need to have line breaks
		code = mw.ustring.gsub(code, '\n', '')
		code = mw.ustring.gsub(code, '(|[^=|]+)1=', '%1=')
		t[2] = '}}'
		if not mw.ustring.match(code, '[%[{]') then
			code = mw.ustring.gsub(code, '|[^=|]*=$', '')
			code = mw.ustring.gsub(code, '|[^=|]*$', '')
		end
	end
	if not mw.ustring.match(code, '[%[{]') then
		code = mw.ustring.gsub(code, '|[^=|]*=|', '|')
		code = mw.ustring.gsub(code, '|[^=|]*|', '|')
		code = mw.ustring.gsub(code, '|[^=|]*=\n', '\n')
		code = mw.ustring.gsub(code, '|[^=|]*\n', '\n')
	end
	return t[1]..code..t[2]
end

return p