Модул:Color contrast

---- This module implements--  {{Color contrast ratio}}--  {{Greater color contrast ratio}}--  {{ColorToLum}}--  {{RGBColorToLum}}--local p = {}local HTMLcolor = mw.loadData( 'Module:Color contrast/colors' )local function sRGB (v)if (v <= 0.03928) thenv = v / 12.92elsev = math.pow((v+0.055)/1.055, 2.4)endreturn vendlocal function rgbdec2lum(R, G, B)if ( 0 <= R and R < 256 and 0 <= G and G < 256 and 0 <= B and B < 256 ) thenreturn 0.2126 * sRGB(R/255) + 0.7152 * sRGB(G/255) + 0.0722 * sRGB(B/255)elsereturn ''endendlocal function hsl2lum(h, s, l)if ( 0 <= h and h < 360 and 0 <= s and s <= 1 and 0 <= l and l <= 1 ) thenlocal c = (1 - math.abs(2*l - 1))*slocal x = c*(1 - math.abs( math.fmod(h/60, 2) - 1) )local m = l - c/2local r, g, b = m, m, mif( 0 <= h and h < 60 ) thenr = r + cg = g + xelseif( 60 <= h and h < 120 ) thenr = r + xg = g + celseif( 120 <= h and h < 180 ) theng = g + cb = b + xelseif( 180 <= h and h < 240 ) theng = g + xb = b + celseif( 240 <= h and h < 300 ) thenr = r + xb = b + celseif( 300 <= h and h < 360 ) thenr = r + cb = b + xendreturn rgbdec2lum(255*r, 255*g, 255*b)elsereturn ''endendlocal function color2lum(c)if (c == nil) thenreturn ''end-- html '#' entityc = c:gsub("&#35;", "#")-- whitespacec = c:match( '^%s*(.-)[%s;]*$' )-- unstrip nowiki strip markersc = mw.text.unstripNoWiki(c)-- lowercasec = c:lower()-- first try to look it uplocal L = HTMLcolor[c]if (L ~= nil) thenreturn Lend-- convert from hslif mw.ustring.match(c,'^hsl%([%s]*[0-9][0-9%.]*[%s]*,[%s]*[0-9][0-9%.]*%%[%s]*,[%s]*[0-9][0-9%.]*%%[%s]*%)$') thenlocal 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]*%)$')return hsl2lum(tonumber(h), tonumber(s)/100, tonumber(l)/100)end-- convert from rgbif mw.ustring.match(c,'^rgb%([%s]*[0-9][0-9]*[%s]*,[%s]*[0-9][0-9]*[%s]*,[%s]*[0-9][0-9]*[%s]*%)$') thenlocal 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]*%)$')return rgbdec2lum(tonumber(R), tonumber(G), tonumber(B))end-- convert from rgb percentif mw.ustring.match(c,'^rgb%([%s]*[0-9][0-9%.]*%%[%s]*,[%s]*[0-9][0-9%.]*%%[%s]*,[%s]*[0-9][0-9%.]*%%[%s]*%)$') thenlocal 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]*%)$')return rgbdec2lum(255*tonumber(R)/100, 255*tonumber(G)/100, 255*tonumber(B)/100)end-- remove leading # (if there is one) and whitespacec = mw.ustring.match(c, '^[%s#]*([a-f0-9]*)[%s]*$')-- split into rgblocal cs = mw.text.split(c or '', '')if( #cs == 6 ) thenlocal R = 16*tonumber('0x' .. cs[1]) + tonumber('0x' .. cs[2])local G = 16*tonumber('0x' .. cs[3]) + tonumber('0x' .. cs[4])local B = 16*tonumber('0x' .. cs[5]) + tonumber('0x' .. cs[6])return rgbdec2lum(R, G, B)elseif ( #cs == 3 ) thenlocal R = 16*tonumber('0x' .. cs[1]) + tonumber('0x' .. cs[1])local G = 16*tonumber('0x' .. cs[2]) + tonumber('0x' .. cs[2])local B = 16*tonumber('0x' .. cs[3]) + tonumber('0x' .. cs[3])return rgbdec2lum(R, G, B)end-- failure, return blankreturn ''end-- This exports the function for use in other modules.-- The colour is passed as a string.function p._lum(color)return color2lum(color)endfunction p._greatercontrast(args)local bias = tonumber(args['bias'] or '0') or 0local css = (args['css'] and args['css'] ~= '') and true or falselocal 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' and type(v2) == 'number') thenratio1 = (v2 + 0.05)/(v1 + 0.05)ratio1 = (ratio1 < 1) and 1/ratio1 or ratio1endif (type(v1) == 'number' and type(v3) == 'number') thenratio2 = (v3 + 0.05)/(v1 + 0.05)ratio2 = (ratio2 < 1) and 1/ratio2 or ratio2endif css thenlocal c1 = args[1] or ''if mw.ustring.match(c1, '^[A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9]$') ormw.ustring.match(c1, '^[A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9]$') thenc1 = '#' .. c1endif mw.ustring.match(c2, '^[A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9]$') ormw.ustring.match(c2, '^[A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9]$') thenc2 = '#' .. c2endif mw.ustring.match(v3, '^[A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9]$') ormw.ustring.match(v3, '^[A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9]$') thenc3 = '#' .. c3endreturn 'background-color:' .. c1 .. '; color:' .. ((ratio1 > 0) and (ratio2 > 0) and ((ratio1 + bias > ratio2) and c2 or c3) or '') .. ';'endreturn (ratio1 > 0) and (ratio2 > 0) and ((ratio1 + bias > ratio2) and c2 or c3) or ''endfunction p._ratio(args)local v1 = color2lum(args[1])local v2 = color2lum(args[2])if (type(v1) == 'number' and type(v2) == 'number') then-- v1 should be the brighter of the two.if v2 > v1 thenv1, v2 = v2, v1endreturn (v1 + 0.05)/(v2 + 0.05)elsereturn args['error'] or '?'endendfunction p._styleratio(args)local style = (args[1] or ''):lower()local bg, fg = 'white', 'black'local lum_bg, lum_fg = 1, 0if args[2] thenlocal lum = color2lum(args[2])if lum ~= '' then bg, lum_bg = args[2], lum endendif args[3] thenlocal lum = color2lum(args[3])if lum ~= '' then fg, lum_fg = args[3], lum endendlocal slist = mw.text.split(mw.ustring.gsub(mw.ustring.gsub(style or '', '&#[Xx]23;', '#'), '&#35;', '#'), ';')for k = 1,#slist dolocal 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]*$')) thenlocal lum = color2lum(v)if( lum ~= '' ) then bg, lum_bg = v, lum endelseif (k:match('^[%s]*(color)[%s]*$')) thenlocal lum = color2lum(v)if( lum ~= '' ) then bg, lum_fg = v, lum endendendif lum_bg > lum_fg thenreturn (lum_bg + 0.05)/(lum_fg + 0.05)elsereturn (lum_fg + 0.05)/(lum_bg + 0.05)endend--[[Use {{#invoke:Color contrast|somecolor}} directly or{{#invoke:Color contrast}} 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().argsreturn p._ratio(args)endfunction p.styleratio(frame)local args = frame.args[1] and frame.args or frame:getParent().argsreturn p._styleratio(args)endfunction p.greatercontrast(frame)local args = frame.args[1] and frame.args or frame:getParent().argsreturn p._greatercontrast(args)endreturn p