Module:Color contrast: Difference between revisions
fix unintended color2lum global error which is causing errors; clean whitespace
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(fix unintended color2lum global error which is causing errors; clean whitespace) |
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-- | -- | ||
-- This module implements | -- This module implements | ||
-- {{Color contrast ratio}} | -- {{Color contrast ratio}} | ||
-- {{Greater color contrast ratio}} | -- {{Greater color contrast ratio}} | ||
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local HTMLcolor = mw.loadData( 'Module:Color contrast/colors' ) | local HTMLcolor = mw.loadData( 'Module:Color contrast/colors' ) | ||
local function sRGB ( v ) | local function sRGB (v) | ||
if (v <= 0.03928) then | if (v <= 0.03928) then | ||
v = v / 12.92 | v = v / 12.92 | ||
else | else | ||
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end | end | ||
local function rgbdec2lum( R, G, B ) | 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 | 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) | return 0.2126 * sRGB(R/255) + 0.7152 * sRGB(G/255) + 0.0722 * sRGB(B/255) | ||
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end | end | ||
local function hsl2lum( h, s, l ) | 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 | 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 c = (1 - math.abs(2*l - 1))*s | ||
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end | end | ||
local function color2lum( c ) | local function color2lum(c) | ||
if (c == nil) then | if (c == nil) then | ||
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end | 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]*%)$') then | |||
local h, s, l = mw.ustring.match(c,'^hsl%([%s]*([0-9][0-9%.]*)[%s]*,[%s]*([0-9][0-9%.]*)%%[%s]*,[%s]*([0-9][0-9%.]*)%%[%s]*%)$') | 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]*%)$') | ||
return hsl2lum(tonumber(h), tonumber(s)/100, tonumber(l)/100) | return hsl2lum(tonumber(h), tonumber(s)/100, tonumber(l)/100) | ||
end | |||
-- convert from rgb | |||
if mw.ustring.match(c,'^rgb%([%s]*[0-9][0-9]*[%s]*,[%s]*[0-9][0-9]*[%s]*,[%s]*[0-9][0-9]*[%s]*%)$') 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]*%)$') | local R, G, B = mw.ustring.match(c,'^rgb%([%s]*([0-9][0-9]*)[%s]*,[%s]*([0-9][0-9]*)[%s]*,[%s]*([0-9][0-9]*)[%s]*%)$') | ||
return rgbdec2lum(tonumber(R), tonumber(G), tonumber(B)) | 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]*%)$') then | |||
local R, G, B = mw.ustring.match(c,'^rgb%([%s]*([0-9][0-9%.]*)%%[%s]*,[%s]*([0-9][0-9%.]*)%%[%s]*,[%s]*([0-9][0-9%.]*)%%[%s]*%)$') | 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) | return rgbdec2lum(255*tonumber(R)/100, 255*tonumber(G)/100, 255*tonumber(B)/100) | ||
end | |||
-- remove leading # (if there is one) and whitespace | -- remove leading # (if there is one) and whitespace | ||
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-- failure, return blank | -- failure, return blank | ||
return '' | 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 | end | ||
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ratio2 = (ratio2 < 1) and 1/ratio2 or ratio2 | ratio2 = (ratio2 < 1) and 1/ratio2 or ratio2 | ||
end | end | ||
if css then | if css then | ||
local c1 = args[1] or '' | local c1 = args[1] or '' | ||
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return 'background-color:' .. c1 .. '; color:' .. ((ratio1 > 0) and (ratio2 > 0) and ((ratio1 + bias > ratio2) and c2 or c3) or '') .. ';' | return 'background-color:' .. c1 .. '; color:' .. ((ratio1 > 0) and (ratio2 > 0) and ((ratio1 + bias > ratio2) and c2 or c3) or '') .. ';' | ||
end | end | ||
return (ratio1 > 0) and (ratio2 > 0) and ((ratio1 + bias > ratio2) and c2 or c3) or '' | return (ratio1 > 0) and (ratio2 > 0) and ((ratio1 + bias > ratio2) and c2 or c3) or '' | ||
end | end | ||
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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) | function p.lum(frame) | ||
local color = frame.args[1] or frame:getParent().args[1] | |||
return p._lum(color) | |||
end | end | ||