Editing Module:Sandbox/Ythlev/Adjacent stations

local p, data, defaultData, lineData, typeData, funcIsAdjacent = {}
local function dig(...)
	-- Digs through a table with sub-tables using arguments as keys, returning the value of the last key argument
	-- Analogous to returning a file given a file path with sub-folders
	-- Returns nil if any given sub-table does not exist
	local arg, n = {...}, select('#', ...)
	local a, i = arg[1], 1
	while a and i < n do
		a = a[arg[i + 1]]
		i = i + 1
	end
	return a
end
local function makeInvokeFunc(funcName)
	return function (frame)
		local args = require('Module:Arguments').getArgs(frame)
		if funcName == '_adjacent' then
			funcIsAdjacent = true
			local tableTools = require('Module:TableTools')
			args = tableTools.numData(args)
			if args.other then
				args[1] = args[1] or {}
				for k, _ in pairs(args.other) do args[1][k] = args[1][k] or args['other'][k] end
			end
			return p[funcName](tableTools.compressSparseArray(args))
		else
			args.system = args.system or args[1]
			if args.system then
				local s = 'Module:Rail/' .. args.system
				local t = 'Module:Adjacent stations/' .. args.system
				data = mw.title.new(s).exists and mw.loadData(s) or mw.title.new(t).exists and mw.loadData(t)
			end
			if funcName ~= '_infoboxStation' then
				args.line = args.line or args[funcName == '_station' and 3 or 2]
				args['type'] = args['type'] or args[funcName == '_station' and 4 or 3]
				if funcName ~= '_station' then
					defaultData = dig(data, 'lines', '_default')
					if args.line then
						lineData = 
							dig(data, 'lines', args.line) or
							dig(data, 'lines', dig(data, 'aliases', string.lower(args.line)))
					end
					typeData = dig(lineData, 'types', args['type'])
					if funcName == '_icon' or funcName == '_box' then
						args.style =
							args.style or args.inline or
							dig(typeData, 'icon format') or
							dig(lineData, 'icon format') or
							dig(data, 'system icon format')
						args.style = args.style == 'image' and nil or args.style
						funcName = args.style and '_box'
					end
				end
			end
			return p[funcName](args, not data and frame)
		end
	end
end
p.style = makeInvokeFunc('_infoboxStation')
p.infoboxStation = makeInvokeFunc('_infoboxStation')
function p._infoboxStation(args, frame)
	local root = mw.html.create('div')
	if args[3] == '_subheader' then
		root:css('background-color', '#EFEFEF')
	end
	if args.system then
		if args[3] == '_subheader' then
			root:css('color', 'white')
		end
		if data then
			root:css(
				dig(data, 'infobox station', args[2], args[3]) or
				dig(data, 'infobox station', args[3])
			)
		else
			if args[3] == '_header' then
				root:cssText(frame:expandTemplate{
					title = args.system .. ' style',
					args = {'name_format'}
				})
			else
				local thcolor = frame:expandTemplate{
					title = args.system .. ' style',
					args = {'thcolor'}					
				}
				root:css('color', thcolor and '#' .. thcolor)
				local thbgcolor = frame:expandTemplate{
					title = args.system .. ' style',
					args = {'thbgcolor'}					
				}
				root:css('background-color', thbgcolor and '#' .. thbgcolor)
			end
		end
	end
	return string.match(tostring(root), '<div style="(.*)"></div>')
end
local function stationTitle(station, line, typ, n)
	if station and data then
		local data, link = funcIsAdjacent and data[n] or data
		if type(data['station format']) == 'table' then
			local defaultFormat = data['station format']
			if type(defaultFormat[station]) == 'table' then
				local stationFormat = defaultFormat[station]
				if line then
					line =
						stationFormat[line] and line or
						dig(data, 'aliases', string.lower(line))
				end
				if type(stationFormat[line]) == 'table' then
					local lineFormat = stationFormat[line]
					link = lineFormat[typ] or lineFormat[1]
				else
					link = stationFormat[line] or stationFormat[1]
				end
			else
				link = defaultFormat[station] or defaultFormat[1]
			end
		else
			link = data['station format']
		end
		link = (string.gsub(link, '%%1', station))
		link = line and (string.gsub(link, '%%2', line)) or link
		link = typ and (string.gsub(link, '%%3', typ)) or link
		return
			string.match(link, '%[%[.*%]%]') and link or
			table.concat({'[[', link, '|', station, ']]'})
	end
end
p.station = makeInvokeFunc('_station')
function p._station(args, frame)
	args.station = args.station or args[2]
	if data then
		return stationTitle(args.station, args.line, args['type'])
	else
		return frame:expandTemplate{
			title = args.system .. ' stations',
			args = {
				['station'] = args.station,
				['line'] = args.line,
				['branch'] = args['type']
			}
		}
	end
end
p.line = makeInvokeFunc('_line')
function p._line(args, frame)
	if data then
		return
			typeData and typeData['title'] and table.concat({lineData['title'], ' (', typeData['title'], ')'}) or
			lineData and lineData['title'] or
			defaultData and (string.gsub(defaultData['title'], '%%1', args.line or '_default'))
	else
		return frame:expandTemplate{
			title = args.system .. ' lines',
			args = {args.line, ['branch'] = args['type']}
		}
	end
end
p.color = makeInvokeFunc('_color')
function p._color(args, frame)
	if data then
		return mw.text.nowiki(
			typeData and typeData['color'] or
			lineData and lineData['color'] or
			defaultData and defaultData['color']			
		)
	else
		return frame:expandTemplate{
			title = args.system .. ' color',
			args = {args.line, ['branch'] = args['type']}
		}
	end
end
p.icon = makeInvokeFunc('_icon')
function p._icon(args, frame)
	if data then
		local s =
			typedata and typeData['icon'] or
			lineData and lineData['icon'] or
			data and data['system icon']
		return args.link and (string.gsub(s, '%[%[(.*)|.*%]%]', args.link)) or s
	else
		return frame:expandTemplate{
			title = 'Rail-interchange',
			args = {string.lower(args.system), string.lower(args.line),	['size'] = args.size}
		}
	end
end
p.box = makeInvokeFunc('_box')
function p._box(args, frame)
	local root, style = mw.html.create('div'), args.style
	local colour, lineTitle = p._color(args, frame), p._line(args, frame)
	if colour then
		colour = string.match(colour, '#') and colour or '#' .. colour
	end
	if args.line then
		args.line =
			dig(data, 'lines', args.line) and args.line or
			dig(data, 'aliases', string.lower(args.line))
	end
	local box = mw.html.create('span')
	if style == nil then
		root
			:addClass('legend')
			:css('-webkit-column-break-inside', 'avoid')
			:css('page-break-inside', 'avoid')
			:css('break-inside', 'avoid-column')
		box
			:addClass('legend-color')
			:css('display', 'inline-block')
			:css('width', '1.5em')
			:css('height', '1.5em')
			:css('margin', '1px')
	end
	if
		style == 'dot' or
		style == 'ldot' or
		style == 'square' or
		style == 'lsquare' then
		box:css('line-height', 'initial')
	end
	if
		style == 'dot' or
		style == 'ldot' or
		style == 'square' or
		style == 'lsquare' or
		style == 'xroute' then
		box:css('color', colour)
	else
		box:css('background-color', colour)
	end
	if
		style == nil or
		style == 'link' or
		style == 'inline' or style == 'yes' or
		style == 'box' then
		box:css('border', '1px solid black')
	elseif style and string.match(style, 'route') then
		box
			:css('border', '.075em solid ' .. (
				typeData and typeData['border color'] or
				lineData and lineData['border color'] or
				colour
				)
			)
			:css('padding', '0 .3em')
		if style ~= 'route' then
			box:css('border-radius', '.5em')
		end
	end
	if style and string.match(style, 'route') then
		box
			:css('color',
				typeData and typeData['text color'] or
				lineData and lineData['text color'] or
				style == 'xroute' and colour or
				'white'
			)
			:css('font-weight', args.bold == 'no' or 'bold')
			:css('font-size', 'inherit')
			:css('white-space', 'nowrap')
	end
	local boxText = {
		['inline'] = string.rep('&nbsp;',4),
		['yes'] = string.rep('&nbsp;',4),
		['small'] = string.rep('&nbsp;',1),
		['link'] = string.rep('&nbsp;',4),
		['box'] = string.rep('&nbsp;', 4),
		['dot'] = '●',
		['ldot'] = '●',
		['square'] = '■',
		['lsquare'] = '■',
		['route'] = args.line,
		['croute'] = args.line,
		['xroute'] = args.line
	}
	box:wikitext(boxText[style] or string.rep('&nbsp;',1))
	if
		style == 'link' or
		style == 'ldot' or
		style == 'lsquare' or
		style and string.match(style, 'route') then
			if string.match(lineTitle, '|') then
				root:wikitext((string.gsub(lineTitle, '%[%[.*|(.*)%]%]', tostring(box))))
			else
				root:wikitext((string.gsub(lineTitle, '%]%]', '|' .. tostring(box) .. ']]')))
			end
	elseif style == 'box' then
		root:wikitext(tostring(box))
	else
		root:wikitext(tostring(box), '&nbsp;', lineTitle)
	end
	return root
end
p.main = makeInvokeFunc('_adjacent')
p.adjacent = makeInvokeFunc('_adjacent')
function p._adjacent(args)
	local yesNo = require('Module:Yesno')
	local i18n = require('Module:Adjacent stations/i18n')
	local root, lang = mw.html.create('table'), 'en-GB'
	root:addClass('wikitable adjacent-stations')
	local function renderHeader(stopNoun, systemIcon, systemTitle)
		root
			:tag('tr')
				:tag('th')
					:addClass('hcA')
					:wikitext(i18n[lang]['preceding'](stopNoun))
					:done()
				:tag('th')
					:attr('colspan', 3)
					:css('vertical-align', 'middle')
					:wikitext(systemIcon and systemIcon .. '&nbsp;' .. systemTitle or systemTitle)
					:done()
				:tag('th')
					:addClass('hcA')
					:wikitext(i18n[lang]['following'](stopNoun))
	end
	local function renderSubHeader(subHeader)
		root
			:tag('tr')
				:tag('th')
					:attr('colspan', 5)
					:addClass('hmA')
					:wikitext(subHeader)
	end
	local function renderSideCell(row, rowSpan, adjacent, terminus, oneWay, circular, through, Reverse, note)
		local mainText, subText = mw.html.create('div')
		if adjacent then
			mainText:wikitext(adjacent)
			subText = mw.html.create('div')
			subText:addClass('isA')
			if adjacent == terminus then
				subText:wikitext('Terminus')
			else
				subText:wikitext(oneWay and 'one-way operation' or circular and terminus or i18n[lang]['towards'](terminus))
			end
		else
			mainText:css('font-style', 'italic')
			mainText:wikitext(Reverse and 'Reverses direction' or through and i18n[lang]['through'](through) or 'Terminus')
		end
		row
			:tag('td')
				:attr('rowspan', rowSpan)
				:addClass('bcA')
				:node(mainText)
					:tag('div')
						:css('font-size', 'smaller')
						:wikitext(note)
						:done()
				:node(subText)
	end
	local function renderMidCells(row, rowSpan, colour, backgroundColour, lineTitle, typeTitle, note, transfer)
		if colour then
			colour = string.match(colour, '#') and colour or '#' .. colour
		end
		row
			:tag('td')
				:attr('rowspan', rowSpan)
				:addClass('bbA')
				:css('background-color', colour)
				:done()
			:tag('td')
				:attr('rowspan', rowSpan)
				:addClass('bcA')
				:css('background-color', backgroundColour)
				:wikitext(lineTitle)
					:tag('div')
						:wikitext(typeTitle)
						:done()
					:tag('div')
						:css('font-size', 'smaller')
						:wikitext(note)
						:done()
					:tag('div')
						:addClass('isA')
						:wikitext(i18n[lang]['transfer'](transfer))
						:done()
				:done()
			:tag('td')
				:attr('rowspan', rowSpan)
				:addClass('bbA')
				:css('background-color', colour)
	end
	local function renderNonStopRow(title, colour, isFormer)
		if colour then
			colour = string.match(colour, '#') and colour or '#' .. colour
		end
		root
			:tag('tr')
				:tag('td')
					:attr('colspan', 5)
					:addClass('bcA')
						:tag('div')
							:tag('span')
								:css('border', '1px solid black')
								:css('background-color', colour)
								:wikitext(string.rep('&nbsp;', 4))
								:done()
							:wikitext('&nbsp;', isFormer == true and i18n[lang]['nonstop_past'](title) or i18n[lang]['nonstop_present'](title))
	end
	local function renderNoteRow(note)
		root
			:tag('tr')
				:tag('td')
					:attr('colspan', 5)
					:addClass('bcA')
					:wikitext(note)
	end
	local function makeTerminusFunc(n, fallback)
		return function (side)
			local termini = fallback(side .. ' terminus')
			if type(termini) == 'string' then
				return stationTitle(termini, args[n]['line'], args[n]['type'], n)
			elseif type(termini) == 'table' then
				local i, t, to = 1, {}, args[n]['to-' .. side] or args[n]['to']
				while termini[i] and to ~= termini[i] do
					t[i] = stationTitle(termini[i], args[n]['line'], args[n]['type'], n)
					i = i + 1
				end
				return stationTitle(termini[i], args[n]['line'], args[n]['type'], n) or mw.text.listToText(t, nil, ' or ')
			end
		end
	end
	data = {}
	local j, k, l = 2, 2, 2
	for i, v in ipairs(args) do
		args[i]['system'] = args[i]['system'] or args[i - 1]['system']
		data[i] = mw.loadData('Module:Adjacent stations/' .. args[i]['system'])
		lang = data[i]['lang'] or 'en-GB'
		defaultData = function (n) return dig(data[n], 'lines', '_default') end
		if args[i]['line'] then
			args[i]['line'] =
				dig(data[i], 'lines', args[i]['line']) and args[i]['line'] or
				dig(data[i], 'aliases', string.lower(args[i]['line'])) or
				error(i18n[lang]['error_unknown'](args[i]['line']))
		else
			args[i]['line'] = i == 1 and '_default' or args[i - 1]['line']
		end
		lineData = function (n, line) return
			dig(data[n], 'lines', line or v.line) or
			dig(data[n], 'lines', dig(data[n], 'aliases', string.lower(line or v.line)))
		end
		typeData = function (n) return dig(lineData(n), 'types', v['type']) end
		local function fallback(parameter, n)
			return dig(typeData(n or i), parameter) or dig(lineData(n or i), parameter) or dig(defaultData(n or i), parameter)
		end
		local terminus = makeTerminusFunc(i, fallback)
		if i == 1 or args[i]['system'] ~= args[i - 1]['system'] then
			renderHeader(
				data[i]['header stop noun'] or i18n[lang]['stop_noun'],
				data[i]['system icon'],
				data[i]['system title'] or '[[' .. args[i]['system'] .. ']]'
			)
		end
		if v.header then renderSubHeader(v.header) end
		if v.nonstop then
			renderNonStopRow(fallback('title'), fallback('color'), v.nonstop == 'former')
		else
			local row = root:tag('tr')
			if i > j - 2  then
				while args[j] and
					args[j]['left'] == args[i]['left'] and
					args[j]['to-left'] == args[i]['to-left'] and
					args[j]['oneway-left'] == args[i]['oneway-left'] and
					args[j]['note-left'] == args[i]['note-left'] and
					(args[j]['through-left'] or args[j]['through']) == (args[i]['through-left'] or args[i]['through']) and
					(args[j]['reverse-left'] or args[j]['reverse']) == (args[i]['reverse-left'] or args[i]['reverse']) and
					fallback('oneway-left', j) == fallback('oneway-left') and
					fallback('circular', j) == fallback('circular') and
					not args[j]['nonstop'] and
					not args[j]['note-row'] do
					j = j + 1
				end
				renderSideCell(
					row,
					j - i,
					stationTitle(v.left, v.line, v['type'], i),
					yesNo(fallback('circular')) and fallback('left terminus') or terminus('left'),
					yesNo(v['oneway-left'] or fallback('oneway-left')),
					yesNo(fallback('circular')),
					(v['through-left'] or v['through']) and dig(lineData(i, v['through-left'] or v['through']), 'title'),
					yesNo(v['reverse-left'] or v['reverse']),
					v['note-left']
				)
				j = j + 1
			end
			if i > k - 2 then
				while args[k] and
					args[k]['line'] == args[i]['line'] and
					args[k]['type'] == args[i]['type'] and
					args[k]['note-mid'] == args[i]['note-mid'] and
					not args[k]['nonstop'] and
					not args[k]['note-row'] do
					k = k + 1
				end
				renderMidCells(
					row,
					k - i,
					fallback('color'),
					fallback('background color'),
					lineData(i)['title'] or (string.gsub(dig(defaultData(i), 'title'), '%%1', v.line)),
					typeData(i) and typeData(i)['title'],
					v['note-mid'] or lineData(i)['note-mid'],
					stationTitle(v.transfer, v.line, v['type'], i)
				)
				k = k + 1
			end
			if i > l - 2  then
				while args[l] and
					args[l]['right'] == args[i]['right'] and
					args[l]['to-right'] == args[i]['to-right'] and
					args[l]['oneway-right'] == args[i]['oneway-right'] and
					args[l]['note-right'] == args[i]['note-right'] and
					(args[l]['through-right'] or args[l]['through']) == (args[i]['through-right'] or args[i]['through']) and
					(args[l]['reverse-right'] or args[l]['reverse']) == (args[i]['reverse-right'] or args[i]['reverse']) and
					fallback('oneway-right', l) == fallback('oneway-right') and
					fallback('circular', l) == fallback('circular') and
					not args[l]['nonstop'] and
					not args[l]['note-row'] do
					l = l + 1
				end
				renderSideCell(
					row,
					l - i,
					stationTitle(v.right, v.line, v['type'], i),
					yesNo(fallback('circular')) and fallback('right terminus') or terminus('right'),
					yesNo(v['oneway-right'] or fallback('oneway-right')),
					yesNo(fallback('circular')),
					(v['through-right'] or v['through']) and dig(lineData(i, v['through-right'] or v['through']), 'title'),
					yesNo(v['reverse-right'] or v['reverse']),
					v['note-right']
				)
				l = l + 1
			end
		end
		if v['note-row'] then renderNoteRow(v['note-row']) end
	end
	return root
end
function p.convert(frame)
	local args = frame.args
	local code = mw.text.split(mw.ustring.gsub(args[1], '^%s*{{(.*)}}%s*$', '%1'), '%s*}}%s*{{%s*')
	local system
	local group = 0
	local delete = {
		['s-rail'] = true,
		['s-rail-next'] = true,
		['s-rail-national'] = true,
		['s-start'] = true,
		['s-rail-start'] = true,
		['start'] = true,
		['s-end'] = true,
		['end'] = true
	}
	local order = {
		'line', 'left', 'right', 'to-left', 'to-right',
		'oneway-left', 'oneway-right', 'through-left', 'through-right',
		'reverse', 'reverse-left', 'reverse-right',
		'note-left', 'note-mid', 'note-right', 'transfer'
		-- circular: use module subpage
		-- state: not implemented
	}
	local replace = {
		['previous'] = 'left',
		['next'] = 'right',
		['type'] = 'to-left',
		['type2'] = 'to-right',
		['branch'] = 'type',
		['note'] = 'note-left',
		['notemid'] = 'note-mid',
		['note2'] = 'note-right',
		['oneway1'] = 'oneway-left',
		['oneway2'] = 'oneway-right',
		['through1'] = 'through-left',
		['through2'] = 'through-right'
	}
	local remove_rows = {}
	local data = {}
	for i, v in ipairs(code) do
		code[i] = mw.ustring.gsub(code[i], '\n', ' ')
		local template = mw.ustring.lower(mw.text.trim(mw.ustring.match(code[i], '^[^|]+')))
		code[i] = mw.ustring.match(code[i], '(|.+)$')
		if 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+square==0) then
						local count = mw.clone(m)+1
						while not (curly+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', '\n}}'}
	system = mw.ustring.match(code, '|system(%d*)=')
	code = mw.ustring.gsub(code, '\n\n+', '\n')
	if tonumber(system) > 1 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|system1='..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