Editing Module:Location map/sandbox2

--=============================================================
-- Module:Location_map/sandbox2 - Map marker with autofixing
--=============================================================
--
--  This version of Module:Location_map will autofix the
--  parameters, to attempt to display a map marker even
--  though the parameters might be invalid.
--
local p = {}

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

local function round(n, digits)
	local mult = math.pow(10, digits)
	return math.floor(n * mult + 0.5) / mult
end

local function getMapParams(map, frame)
	if mw.title.new('Module:Location map/data/' .. map).exists then
		local mapData = mw.loadData('Module:Location map/data/' .. map)
		return function(name, params)
			if mapData[name] == nil then
				return ''
			elseif params then
				return mw.message.newRawMessage(mapData[name], unpack(params)):plain()
			else
				return mapData[name]
			end
		end
	else
		local cache = {}
		return function(name, params)
			if params then
				return frame:expandTemplate{title = 'Location map ' .. map, args = { name, unpack(params) }}
			else
				if cache[name] == nil then
					cache[name] = frame:expandTemplate{title = 'Location map ' .. map, args = { name }}
				end
				return cache[name]
			end
		end
	end
end

local function decdeg(degrees, minutes, seconds, hemisphere, digits, decimal)
	if degrees == nil then
                local n = tonumber(decimal);
                if n == nil then
                  n = tonumber( string.sub(decimal,1,-2) );
                end
                if n == nil then
                  n = tonumber( string.sub(decimal,1,-3) );
                end
		return n
	end
	decimal = (degrees or 0) + (minutes or 0)/60 + (seconds or 0)/3600
	if hemisphere == 'W' or hemisphere == 'w' or hemisphere == 'S' or  hemisphere == 's' then
		decimal = -decimal
	end
	if digits == nil then
		digits = 7
	end
	return round(decimal, digits)
end

function p.top(frame, args, map)
	if not args then
		args = getArgs(frame)
	end
	if not map then
		map = getMapParams(args[1], frame)
	end
	local width
	if args.width then
		width = mw.ustring.gsub(args.width, 'px', '')
	else
		width = round((args.default_width or 240) * (tonumber(map('defaultscale')) or 1), 0)
	end
	local retval = ''
	if args.float == 'center' then
		retval = retval .. '<div class="center">'
	end
	if args.caption then
		retval = retval .. '<div class="thumb '
		if args.float == '"left"' or args.float == 'left' then
			retval = retval .. 'tleft'
		elseif args.float == '"center"' or args.float == 'center' or args.float == '"none"' or args.float == 'none' then
			retval = retval .. 'tnone'
		else
			retval = retval .. 'tright'
		end
		retval = retval .. '"><div <!--class="thumbinner"--> style="width:' .. (width + 2) .. 'px; '
		if args.border == 'none' then
			retval = retval .. 'border: none;'
		elseif args.border then
			retval = retval .. 'border-color:' .. args.border .. ';'
		end
		retval = retval .. '"><div style="position: relative; '
		if args.border ~= 'none' then
			retval = retval .. 'border: 1px solid lightgray'
		end
		retval = retval .. '">'
	else
		retval = retval .. '<div style="width:' .. width .. 'px; '
		if args.float == '"left"' or args.float == 'left' then
			retval = retval .. 'float: left; clear: left'
		elseif args.float == '"center"' or args.float == 'center' then
			retval = retval .. 'float: none; clear: both; margin-left: auto; margin-right: auto'
		elseif args.float == '"none"' or args.float == 'none' then
			retval = retval .. 'float: none; clear: none'
		else
			retval = retval .. 'float: right; clear: right'
		end
		retval = retval .. '"><div style="width:' .. width .. 'px; padding:0"><div style="position: relative; ">'
	end
	local image
	if args.AlternativeMap then
		image = args.AlternativeMap
	elseif args.relief and map('image1') ~= '' then
		image = map('image1')
	else
		image = map('image')
	end
	retval = retval .. '[[File:' .. image .. '|' .. width .. 'px|' .. (args.alt or ((args.label or mw.title.getCurrentTitle().text) .. ' is located in ' .. map('name'))) .. ']]'
	if args.overlay_image then
		retval = retval .. '<div style="position:absolute; top: 0; left: 0">[[File:' .. args.overlay_image .. '|' .. width .. 'px|link=File:' .. image .. ']]</div>'
	end
	return retval
end

function p.bottom(frame, args, map)
	if not args then
		args = getArgs(frame)
	end
	if not map then
		map = getMapParams(args[1], frame)
	end
	local retval = ''
	retval = retval .. '</div><div ' .. (args.caption and 'class="thumbcaption"' or 'style="font-size: 90%; padding-top:3px"') .. '>'
	local caption = frame.args.caption or frame:getParent().args.caption

	if args.lon_deg == nil then
                local n = tonumber(args.long);
                if n == nil then
		  if caption==nil then caption='' end
                  caption = caption .. " <sup>[fix long=" ..args.long.. "]</sup>"
                end
	end
	if args.lat_deg == nil then
                local n = tonumber(args.lat);
                if n == nil then
		  if caption==nil then caption='' end
                  caption = caption .. " <sup>[fix lat=" ..args.lat.. "]</sup>"
                end
	end
	if caption and not args.caption_undefined then
		retval = retval .. mw.text.trim(caption)
	else
		retval = retval .. (args.label or mw.title.getCurrentTitle().text) .. ' (' .. map('name') .. ')'
	end
	retval = retval .. '</div></div></div>'
	if args.float == 'center' then
		retval = retval .. '</div>'
	end
	return retval
end

function p.container(frame, args, map)
	if not args then
		args = getArgs(frame)
	end
	if not map then
		map = getMapParams(args[1], frame)
	end
	return p.top(frame, args, map) .. (args.places or '') .. p.bottom(frame, args, map)
end

local function markOuterDiv(x, y, content)
	return '<div style="position:absolute; z-index:2; top:' .. y .. '%;left:' .. x .. '%;height:0;width:0;margin:0;padding:0">' .. content .. '</div>'
end

local function markImageDiv(mark, marksize, label, link, alt, title)
	local retval = '<div style="position:relative;text-align:center;left:-' .. round(marksize / 2, 0) .. 'px;top:-' .. round(marksize / 2, 0) .. 'px;width:' .. marksize .. 'px;font-size:' .. 9 .. 'px;line-height:0"'
	if title then
		retval = retval .. ' title="' .. title .. '"'
	end
	retval = retval .. '>'
	if marksize ~= 0 then
		retval = retval .. '[[File:' .. mark .. '|' .. marksize .. 'x' .. marksize .. 'px|' .. label .. '|link=' .. link
		if alt then
			retval = retval .. '|alt=' .. alt
		end
		retval = retval .. ']]'
	end
	return retval .. '</div>'
end

local function markLabelDiv(label, label_size, label_width, position, background, x)
	local retval = '<div style="font-size:' .. label_size .. '%;line-height:110%;position:relative;top:-1.5em;width:' .. label_width .. 'em;'
	if position == 'top' then -- specified top
		retval = retval .. 'top:-2.65em;left:-3em;text-align:center'
	elseif position == 'bottom' then -- specified bottom
		retval = retval .. 'top:-0.15em;left:-3em;text-align:center'
	elseif position == 'left' or (tonumber(x) > 70 and position ~= 'right') then -- specified left or autodetected to left
		retval = retval .. 'left:-6.5em;text-align:right'
	else -- specified right or autodetected to right
		retval = retval .. 'left:0.5em;text-align:left'
	end
	retval = retval .. '"><span style="padding:1px'
	if background then
		retval = retval .. ';background-color:' .. background
	end
	return retval .. '">' .. label .. '</span></div>'
end

local function getX(longitude, latitude, lon_dir, left, right, top, bottom, crosses180, skew, lon_shift)
	local crosses180_correction = crosses180 and lon_dir == 'W' and (-36000/(left - right)) or 0
	if skew then
		local lat_ratio = (top - latitude)/(top - bottom)
		local skew_factor = (1 - skew) * lat_ratio + skew
		longitude = (longitude - 0.5 * (right + left) + lon_shift) * skew_factor + 0.5 * (right + left) - lon_shift
	end
	return round(crosses180_correction + 100 * (longitude - left) / (right - left), 1)
end

local function getY(latitude, top, bottom)
	return round(100 * (top - latitude) / (top - bottom), 1)
end

function p.mark(frame, args, map)
	if not args then
		args = getArgs(frame)
	end
	if not map then
		map = getMapParams(args[1], frame)
	end
	local x, y, longitude, latitide
	longitude = decdeg(args.lon_deg, args.lon_min, args.lon_sec, args.lon_dir, nil, args.long)
	latitude = decdeg(args.lat_deg, args.lat_min, args.lat_sec, args.lat_dir, nil, args.lat)
	if map('x') ~= '' then
		x = frame:callParserFunction('#expr', map('x', { latitude, longitude }))
	else
		x = getX(longitude, latitude, args.lon_dir, map('left'), map('right'), map('top'), map('bottom'), map('crosses180') ~= '', tonumber(args.skew or map('skew')), args.lon_shift or 0)
	end
	if map('y') ~= '' then
		y = frame:callParserFunction('#expr', map('y', { latitude, longitude }))
	else
		y = getY(latitude, map('top'), map('bottom'))
	end
	local mark = args.mark or map('mark')
	if mark == '' then
		mark = 'Red pog.svg'
	end
	local divContent = markImageDiv(mark, tonumber(args.marksize) or tonumber(map('marksize')) or 8, args.label or mw.title.getCurrentTitle().text, args.link or '', args.alt, args[2])
	if args.label and args.position ~= 'none' then
		divContent = divContent .. markLabelDiv(args.label, args.label_size or 90, args.label_width or 6, args.position, args.background, x)
	end
	return markOuterDiv(x, y, divContent)
end

function p.main(frame, args, map)
	if not args then
		args = getArgs(frame)
	end
	if not args[1] then
		args[1] = 'World'
	end
	if not map then
		map = getMapParams(args[1], frame)
	end
	return p.top(frame, args, map) .. p.mark(frame, args, map) .. p.bottom(frame, args, map)
end

return p