---- This module implements -- -- -- -- --local p = local HTMLcolor = mw.loadData('Module:Color contrast/colors')
local function sRGB (v) if (v <= 0.03928) then v = v / 12.92 else v = math.pow((v+0.055)/1.055, 2.4) end return vend
local function rgbdec2lum(R, G, B) if (0 <= R and R < 256 and 0 <= G and G < 256 and 0 <= B and B < 256) then return 0.2126 * sRGB(R/255) + 0.7152 * sRGB(G/255) + 0.0722 * sRGB(B/255) else return endend
local function hsl2lum(h, s, l) if (0 <= h and h < 360 and 0 <= s and s <= 1 and 0 <= l and l <= 1) then local c = (1 - math.abs(2*l - 1))*s local x = c*(1 - math.abs(math.fmod(h/60, 2) - 1)) local m = l - c/2
local r, g, b = m, m, m if(0 <= h and h < 60) then r = r + c g = g + x elseif(60 <= h and h < 120) then r = r + x g = g + c elseif(120 <= h and h < 180) then g = g + c b = b + x elseif(180 <= h and h < 240) then g = g + x b = b + c elseif(240 <= h and h < 300) then r = r + x b = b + c elseif(300 <= h and h < 360) then r = r + c b = b + x end return rgbdec2lum(255*r, 255*g, 255*b) else return endend
-- This exports the function for use in other modules.-- The colour is passed as a string.function p._lum(color) return color2lum(color)end
local function color2lum(c)
if (c
-- html '#' entity c = c:gsub("#", "#")
-- whitespace c = c:match('^%s*(.-)[%s;]*$')
-- unstrip nowiki strip markers c = mw.text.unstripNoWiki(c)
-- lowercase c = c:lower
-- first try to look it up local L = HTMLcolor[c] if (L ~= nil) then return L end
-- convert from hsl if mw.ustring.match(c,'^hsl%([%s]*[0-9][0-9%.]*[%s]*,[%s]*[0-9][0-9%.]*%%[%s]*,[%s]*[0-9][0-9%.]*%%[%s]*%)$') then local h, s, l = mw.ustring.match(c,'^hsl%([%s]*([0-9][0-9%.]*)[%s]*,[%s]*([0-9][0-9%.]*)%%[%s]*,[%s]*([0-9][0-9%.]*)%%[%s]*%)$') return hsl2lum(tonumber(h), tonumber(s)/100, tonumber(l)/100) end
-- convert from rgb if mw.ustring.match(c,'^rgb%([%s]*[0-9][0-9]*[%s]*,[%s]*[0-9][0-9]*[%s]*,[%s]*[0-9][0-9]*[%s]*%)$') then local R, G, B = mw.ustring.match(c,'^rgb%([%s]*([0-9][0-9]*)[%s]*,[%s]*([0-9][0-9]*)[%s]*,[%s]*([0-9][0-9]*)[%s]*%)$') return rgbdec2lum(tonumber(R), tonumber(G), tonumber(B)) end
-- convert from rgb percent if mw.ustring.match(c,'^rgb%([%s]*[0-9][0-9%.]*%%[%s]*,[%s]*[0-9][0-9%.]*%%[%s]*,[%s]*[0-9][0-9%.]*%%[%s]*%)$') then local R, G, B = mw.ustring.match(c,'^rgb%([%s]*([0-9][0-9%.]*)%%[%s]*,[%s]*([0-9][0-9%.]*)%%[%s]*,[%s]*([0-9][0-9%.]*)%%[%s]*%)$') return rgbdec2lum(255*tonumber(R)/100, 255*tonumber(G)/100, 255*tonumber(B)/100) end
-- remove leading # (if there is one) and whitespace c = mw.ustring.match(c, '^[%s#]*([a-f0-9]*)[%s]*$')
-- split into rgb local cs = mw.text.split(c or , ) if(#cs
return rgbdec2lum(R, G, B) elseif (#cs
return rgbdec2lum(R, G, B) end
-- failure, return blank return end
function p._greatercontrast(args) local bias = tonumber(args['bias'] or '0') or 0 local css = (args['css'] and args['css'] ~= ) and true or false local v1 = color2lum(args[1] or ) local c2 = args[2] or '#FFFFFF' local v2 = color2lum(c2) local c3 = args[3] or '#000000' local v3 = color2lum(c3) local ratio1 = -1; local ratio2 = -1; if (type(v1)
'number') then ratio1 = (v2 + 0.05)/(v1 + 0.05) ratio1 = (ratio1 < 1) and 1/ratio1 or ratio1 end if (type(v1)
'number') then ratio2 = (v3 + 0.05)/(v1 + 0.05) ratio2 = (ratio2 < 1) and 1/ratio2 or ratio2 end if css then local c1 = args[1] or if mw.ustring.match(c1, '^[A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9]$') or mw.ustring.match(c1, '^[A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9]$') then c1 = '#' .. c1 end if mw.ustring.match(c2, '^[A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9]$') or mw.ustring.match(c2, '^[A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9]$') then c2 = '#' .. c2 end if mw.ustring.match(v3, '^[A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9]$') or mw.ustring.match(v3, '^[A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9]$') then c3 = '#' .. c3 end return 'background-color:' .. c1 .. '; color:' .. ((ratio1 > 0) and (ratio2 > 0) and ((ratio1 + bias > ratio2) and c2 or c3) or ) .. ';' end return (ratio1 > 0) and (ratio2 > 0) and ((ratio1 + bias > ratio2) and c2 or c3) or end
function p._ratio(args) local v1 = color2lum(args[1]) local v2 = color2lum(args[2]) if (type(v1)
'number') then -- v1 should be the brighter of the two. if v2 > v1 then v1, v2 = v2, v1 end return (v1 + 0.05)/(v2 + 0.05) else return args['error'] or '?' endend
function p._styleratio(args) local style = (args[1] or ):lower local bg, fg = 'white', 'black' local lum_bg, lum_fg = 1, 0
if args[2] then local lum = color2lum(args[2]) if lum ~= then bg, lum_bg = args[2], lum end end if args[3] then local lum = color2lum(args[3]) if lum ~= then fg, lum_fg = args[3], lum end end
local slist = mw.text.split(mw.ustring.gsub(mw.ustring.gsub(style or , '&#[Xx]23;', '#'), '#', '#'), ';') for k = 1,#slist do local s = slist[k] local k,v = s:match('^[%s]*([^:]-):([^:]-)[%s;]*$') k = k or v = v or if (k:match('^[%s]*(background)[%s]*$') or k:match('^[%s]*(background%-color)[%s]*$')) then local lum = color2lum(v) if(lum ~= ) then bg, lum_bg = v, lum end elseif (k:match('^[%s]*(color)[%s]*$')) then local lum = color2lum(v) if(lum ~= ) then bg, lum_fg = v, lum end end end if lum_bg > lum_fg then return (lum_bg + 0.05)/(lum_fg + 0.05) else return (lum_fg + 0.05)/(lum_bg + 0.05) endend
--somecolor}} directly or from a wrapper template.
Parameters: -- |1= — required; A color to check.--
function p.lum(frame) local color = frame.args[1] or frame:getParent.args[1] return p._lum(color)endfunction p.ratio(frame) local args = frame.args[1] and frame.args or frame:getParent.args return p._ratio(args)end
function p.styleratio(frame) local args = frame.args[1] and frame.args or frame:getParent.args return p._styleratio(args)end
function p.greatercontrast(frame) local args = frame.args[1] and frame.args or frame:getParent.args return p._greatercontrast(args)end
return p