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Module:Color contrast: Difference between revisions

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Module:Color contrast (edit)

Revision as of 11:41, 21 May 2021

2,679 bytes added ,  2 years ago
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2 revisions imported from wikipedia:Module:Color_contrast: see Topic:Vtixlm0q28eo6jtf
m>Frietjes
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m (2 revisions imported from wikipedia:Module:Color_contrast: see Topic:Vtixlm0q28eo6jtf)
 
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Line 16: Line 16:
end
end
return v
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
end


local function hsl2lum( h, s, l )
local function hsl2lum( h, s, l )
local lum = ''
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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local m = l - c/2
local m = l - c/2


local R, G, B = m, m, m
local r, g, b = m, m, m
if( 0 <= h and h < 60 ) then
if( 0 <= h and h < 60 ) then
R = R + c
r = r + c
G = G + x
g = g + x
elseif( 60 <= h and h < 120 ) then
elseif( 60 <= h and h < 120 ) then
R = R + x
r = r + x
G = G + c
g = g + c
elseif( 120 <= h and h < 180 ) then
elseif( 120 <= h and h < 180 ) then
G = R + c
g = g + c
B = G + x
b = b + x
elseif( 180 <= h and h < 240 ) then
elseif( 180 <= h and h < 240 ) then
G = R + x
g = g + x
B = G + c
b = b + c
elseif( 240 <= h and h < 300 ) then
elseif( 240 <= h and h < 300 ) then
R = R + x
r = r + x
B = G + c
b = b + c
elseif( 300 <= h and h < 360 ) then
elseif( 300 <= h and h < 360 ) then
R = R + c
r = r + c
B = G + x
b = b + x
end
end
lum = 0.2126 * sRGB(R) + 0.7152 * sRGB(G) + 0.0722 * sRGB(B)
return rgbdec2lum(255*r, 255*g, 255*b)
else
return ''
end
end
return lum
end
end


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return ''
return ''
end
end
-- html '#' entity
c = c:gsub("&#35;", "#")
-- whitespace
-- whitespace
c = c:match( '^%s*(.-)[%s;]*$' )
c = c:match( '^%s*(.-)[%s;]*$' )
-- unstrip nowiki strip markers
c = mw.text.unstripNoWiki(c)


-- lowercase
-- lowercase
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   -- convert from hsl
   -- 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]*%)$') then
   if mw.ustring.match(c,'^hsl%([%s]*[0-9][0-9%.]*[%s]*,[%s]*[0-9][0-9%.]*%%[%s]*,[%s]*[0-9][0-9%.]*%%[%s]*%)$') then
local h = mw.ustring.match(c,'^hsl%([%s]*([0-9][0-9]*)[%s]*,[%s]*[0-9][0-9]*%%[%s]*,[%s]*[0-9][0-9]*%%[%s]*%)$')
local h, s, l = mw.ustring.match(c,'^hsl%([%s]*([0-9][0-9%.]*)[%s]*,[%s]*([0-9][0-9%.]*)%%[%s]*,[%s]*([0-9][0-9%.]*)%%[%s]*%)$')
local s = mw.ustring.match(c,'^hsl%([%s]*[0-9][0-9]*[%s]*,[%s]*([0-9][0-9]*)%%[%s]*,[%s]*[0-9][0-9]*%%[%s]*%)$')
local l = mw.ustring.match(c,'^hsl%([%s]*[0-9][0-9]*[%s]*,[%s]*[0-9][0-9]*%%[%s]*,[%s]*([0-9][0-9]*)%%[%s]*%)$')
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]*%)$') then
local R, G, B = mw.ustring.match(c,'^rgb%([%s]*([0-9][0-9]*)[%s]*,[%s]*([0-9][0-9]*)[%s]*,[%s]*([0-9][0-9]*)[%s]*%)$')
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
   end


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local cs = mw.text.split(c or '', '')
local cs = mw.text.split(c or '', '')
if( #cs == 6 ) then
if( #cs == 6 ) then
local R = sRGB( (16*tonumber('0x' .. cs[1]) + tonumber('0x' .. cs[2]))/255 )
local R = 16*tonumber('0x' .. cs[1]) + tonumber('0x' .. cs[2])
local G = sRGB( (16*tonumber('0x' .. cs[3]) + tonumber('0x' .. cs[4]))/255 )
local G = 16*tonumber('0x' .. cs[3]) + tonumber('0x' .. cs[4])
local B = sRGB( (16*tonumber('0x' .. cs[5]) + tonumber('0x' .. cs[6]))/255 )
local B = 16*tonumber('0x' .. cs[5]) + tonumber('0x' .. cs[6])


L = 0.2126 * R + 0.7152 * G + 0.0722 * B
return rgbdec2lum(R, G, B)
return L
elseif ( #cs == 3 ) then
elseif ( #cs == 3 ) then
local R = sRGB( (16*tonumber('0x' .. cs[1]) + tonumber('0x' .. cs[1]))/255 )
local R = 16*tonumber('0x' .. cs[1]) + tonumber('0x' .. cs[1])
local G = sRGB( (16*tonumber('0x' .. cs[2]) + tonumber('0x' .. cs[2]))/255 )
local G = 16*tonumber('0x' .. cs[2]) + tonumber('0x' .. cs[2])
local B = sRGB( (16*tonumber('0x' .. cs[3]) + tonumber('0x' .. cs[3]))/255 )
local B = 16*tonumber('0x' .. cs[3]) + tonumber('0x' .. cs[3])


L = 0.2126 * R + 0.7152 * G + 0.0722 * B
return rgbdec2lum(R, G, B)
return L
end
end


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function p._greatercontrast(args)
function p._greatercontrast(args)
local bias = tonumber(args['bias'] or '0') or 0
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 v1 = color2lum(args[1] or '')
local c2 = args[2] or '#FFFFFF'
local c2 = args[2] or '#FFFFFF'
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local c3 = args[3] or '#000000'
local c3 = args[3] or '#000000'
local v3 = color2lum(c3)
local v3 = color2lum(c3)
local ratio1 = 0;
local ratio1 = -1;
local ratio2 = 0;
local ratio2 = -1;
if (type(v1) == 'number' and type(v2) == 'number') then
if (type(v1) == 'number' and type(v2) == 'number') then
ratio1 = (v2 + 0.05)/(v1 + 0.05)
ratio1 = (v2 + 0.05)/(v1 + 0.05)
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ratio2 = (ratio2 < 1) and 1/ratio2 or ratio2
ratio2 = (ratio2 < 1) and 1/ratio2 or ratio2
end
end
return (ratio1 + bias > ratio2) and c2 or c3
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
end


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else
else
return args['error'] or '?'
return args['error'] or '?'
end
end
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;', '#'), '&#35;', '#'), ';')
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)
end
end
end
end
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local args = frame.args[1] and frame.args or frame:getParent().args
local args = frame.args[1] and frame.args or frame:getParent().args
return p._ratio(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
end


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