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Module:Gridiron color

Permanently protected module
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This is an old revision of this page, as edited by Ahecht (talk | contribs) at 18:41, 12 December 2019 (After over six months with no complaints, I'm bumping the contrast limit to 4.5, which is the limit for all text under the WCAG 2.0 AA standard and the limit for large text under the WCAG 2.0 AAA standard). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

--
-- This module implements
-- {{Gridiron primary color}} -- {{Gridiron primary color raw}} -- {{Gridiron primary style}}
-- {{Gridiron secondary color}} -- {{Gridiron secondary color raw}}
-- {{Gridiron tertiary color raw}}
-- {{Gridiron alt primary color}} -- {{Gridiron alt primary style}} -- {{Gridiron alt secondary color}}
--

local p = {}

local color_data = mw.loadData("Module:Gridiron color/data")

local yesno = require('Module:Yesno')

local prefixes = {
	"background: ",
	"color: ",
	"/**/",
	"background: ",
	"color: "
	}
	
local default = {"#DCDCDC", "#000000", "none", "", ""}

local function get_year(colors, year)
	if colors and colors[6] and type(colors[6] == 'table') then
		for team, year_colors in pairs(colors[6]) do
			if mw.ustring.find(team, "%d%d%d%dthru%d%d%d%d$") then
				local start_year, end_year = mw.ustring.match(team, "(%d%d%d%d)thru(%d%d%d%d)$")
				if (tonumber(start_year) <= tonumber(year)) and (tonumber(year) <= tonumber(end_year)) then
					return year_colors
				end
			end
		end
	end
	
	return colors
end

local function get_colors(team, unknown, year)
	team = (team or ''):match("^%s*(.-)%s*$")
	year = tonumber(year)
	unknown = unknown or color_data["#default"] or default
	
	local use_default = {
		[""] = 1,
		["retired"] = 1,
		["free agent"] = 1,
	}
	
	local colors = nil
	
	if ( team and use_default[team:lower()] ) then
		colors = unknown
	else
		if mw.ustring.find(team, "%d?%d?%d%dthru%d?%d?%d%d$") then
			if (not year or year <= 0) then
				team, year = mw.ustring.match(team, "^(.-) -(%d?%d?%d%d)thru%d?%d?%d%d$")
				team, year = team:match("^%s*(.-)%s*$"), tonumber(year)
				
				if year >= 20 and year < 100 then -- Two-digit years were deprecated in 2018
					year = year + 1900
				elseif year < 20 then
					year = year + 2000
				elseif year < 1000 then
					year = nil
				end
			else
				team = mw.ustring.match(team, "^(.-) -%d?%d?%d%dthru%d?%d?%d%d$") or team
			end
		end
		
		if year and year > 0 then
			--code for handling year parameter
			colors = get_year(color_data[team], year)
		else
			colors = color_data[team]
		end
		
		if ( colors and type(colors) == 'string') then
			if team == colors then year = nil end
			-- follow alias recursively
			return  get_colors (colors, unknown, year)
		end
	end
	
	return colors or unknown
end

local function bordercss(c, w)
	if w > 0 then
		local s = 'inset ' .. w .. 'px ' .. w .. 'px 0 ' .. c 
			.. ', inset -' .. w .. 'px -' .. w .. 'px 0 ' .. c
		return '-moz-box-shadow: ' .. s .. '; -webkit-box-shadow: ' .. s .. '; box-shadow: ' .. s .. ';'
	else
		return ''
	end
end

local function contrast_check(background, text, colors, alt)
	local c_limit = 4.5
	local contrast = require('Module:Color_contrast')
	if contrast._ratio({[1] = text, [2] = background, ['error'] = 0}) < c_limit then
		if contrast._ratio({[1] = '#FFFFFF', [2] = background, ['error'] = 0}) >= c_limit then
			text = '#FFFFFF'
		elseif contrast._ratio({[1] = '#000000', [2] = background, ['error'] = 0}) >= c_limit then
			text = '#000000'
		elseif (not alt) and (contrast._ratio({[1] = colors[5], [2] = colors[4], ['error'] = 0}) >= c_limit) then
			background, text = colors[4], colors[5]
		else
			background, text = default[1], default[2]
		end
	end
	return background, text
end

function p.test(frame)
	local args = frame.args.team and frame.args or frame:getParent().args
	local colors = get_colors((args.team or args[1]), nil, args.year)
	return '["' .. args.team .. '"] = {{ "' .. colors[1] .. '", '.. colors[2] ..
		'", '.. colors[3] .. '", '.. colors[4] .. '", '.. colors[5] .. '"}}'
end

function p.color(frame, column, altcolumn)
	local args = frame.args.team and frame.args or frame:getParent().args
	local colors = get_colors((args.team or args[1]), nil, args.year)

	column = (column or tonumber(frame.args.column)) or 1
	altcolumn = altcolumn or tonumber(frame.args.altcolumn)
	if ((not colors[column]) or (colors[column] == '')) and altcolumn then
		column = altcolumn
	end
	
	return (yesno(frame.args.raw) and "" or prefixes[column]) .. colors[column]
end

function p.style(frame)
	local team = frame.args.team or frame.args[1] or frame:getParent().args.team or frame:getParent().args[1]
	local year = frame.args.year or frame:getParent().args.year
	local border = frame.args.border or frame:getParent().args.border
	local alt = yesno(frame.args.alt or frame:getParent().args.alt)
	
	local colors = get_colors(team, nil, year)
	
	local background, text
	if alt then background, text = colors[4], colors[5] end
	if ((not background) or (background  == '')) then background = colors[1] end
	if ((not background) or (background  == '')) then background = default[1] end
	if ((not text) or (text  == '')) then text = colors[2] end
	if ((not text) or (text  == '')) then text = default[2] end
	
	background, text = contrast_check(background, text, colors, alt)
	
	local s = prefixes[1] .. background .. "; " .. prefixes[2] .. text .. "; "
	if tonumber(border) or yesno(border) then
		border = tonumber(border) and border or 2
		s = s .. bordercss(colors[3], tonumber(border))
	end
	return '' .. s
end

return p
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