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Módulo:Color contrast

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Revisão de 05h33min de 6 de setembro de 2026 por Tavoraadmin (discussão | contribs) (Importando predefinição/módulo da Wikipédia em português para manter layout)
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-- -- This module implements -- Predefinição:Color contrast ratio -- Predefinição:Greater color contrast ratio -- Predefinição:ColorToLum -- Predefinição:RGBColorToLum -- local p = {} local HTMLcolor = mw.loadData( 'Módulo: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 v end

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 end end

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 end end

local function color2lum(c)

if (c == nil) then return end

-- 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 / hsla (accepts comma or space delimiters) if mw.ustring.match(c,'^hsla?%([%s]*[0-9][0-9%.]*[%s]*[,%s][%s]*[0-9][0-9%.]*%%[%s]*[,%s][%s]*[0-9][0-9%.]*%%.*%)$') then local h, s, l = mw.ustring.match(c,'^hsla?%([%s]*([0-9][0-9%.]*)[%s]*[,%s][%s]*([0-9][0-9%.]*)%%[%s]*[,%s][%s]*([0-9][0-9%.]*)%%.*%)$') return hsl2lum(tonumber(h), tonumber(s)/100, tonumber(l)/100) end

-- convert from rgb / rgba (numeric values 0 to 255) if mw.ustring.match(c,'^rgba?%([%s]*[0-9][0-9]*[%s]*[,%s][%s]*[0-9][0-9]*[%s]*[,%s][%s]*[0-9][0-9]*.*%)$') then local R, G, B = mw.ustring.match(c,'^rgba?%([%s]*([0-9][0-9]*)[%s]*[,%s][%s]*([0-9][0-9]*)[%s]*[,%s][%s]*([0-9][0-9]*).*%)$') return rgbdec2lum(tonumber(R), tonumber(G), tonumber(B)) end

-- convert from rgb / rgba percent if mw.ustring.match(c,'^rgba?%([%s]*[0-9][0-9%.]*%%[%s]*[,%s][%s]*[0-9][0-9%.]*%%[%s]*[,%s][%s]*[0-9][0-9%.]*%%.*%)$') then local R, G, B = mw.ustring.match(c,'^rgba?%([%s]*([0-9][0-9%.]*)%%[%s]*[,%s][%s]*([0-9][0-9%.]*)%%[%s]*[,%s][%s]*([0-9][0-9%.]*)%%.*%)$') 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 == 6 or #cs == 8 ) then -- Accepts 6 digits (#RRGGBB) or 8 digits (#RRGGBBAA) local 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 or #cs == 4 ) then -- Accepts 3 digits (#RGB) or 4 digits (#RGBA) local 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 blank return end

-- This exports the function for use in other modules. -- The colour is passed as a string. function p._lum(color) return color2lum(color) 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 'white' local v2 = color2lum(c2) local c3 = args[3] or 'black' local v3 = color2lum(c3) local ratio1 = -1; local ratio2 = -1; if (type(v1) == 'number' and type(v2) == 'number') then ratio1 = (v2 + 0.05)/(v1 + 0.05) ratio1 = (ratio1 < 1) and 1/ratio1 or ratio1 end if (type(v1) == 'number' and type(v3) == '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 string.match(c1, '^[A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9]?$') or string.match(c1, '^[A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9]?[A-Fa-f0-9]?$') then c1 = '#' .. c1 end if string.match(c2, '^[A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9]?$') or string.match(c2, '^[A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9]?[A-Fa-f0-9]?$') then c2 = '#' .. c2 end if string.match(c3, '^[A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9]?$') or string.match(c3, '^[A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9]?[A-Fa-f0-9]?$') 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' and type(v2) == '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 '?' end end

function p._styleratio(args) local style = (args[1] or ):lower() local lum_bg, lum_fg = 1, 0

if args[2] then local lum = color2lum(args[2]) if lum ~= then lum_bg = lum end end if args[3] then local lum = color2lum(args[3]) if lum ~= then lum_fg = 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 prop, val = s:match( '^[%s]*([^:]-):([^:]-)[%s;]*$' ) prop = prop or val = val or if (prop:match('^[%s]*(background)[%s]*$') or prop:match('^[%s]*(background%-color)[%s]*$')) then local lum = color2lum(val) if( lum ~= ) then lum_bg = lum end elseif (prop:match('^[%s]*(color)[%s]*$')) then local lum = color2lum(val) if( lum ~= ) then lum_fg = 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) end end

--[[ 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) end

function 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

Disponível em “https://wiki.tokusatsus.com/index.php?title=Módulo:Color_contrast&oldid=6343”