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css2rgb = (css) ->
css = css.toLowerCase()
# named X11 colors
if chroma.colors? and chroma.colors[css]
return hex2rgb chroma.colors[css]
# rgb(250,20,0)
if m = css.match /rgb\(\s*(\-?\d+),\s*(\-?\d+)\s*,\s*(\-?\d+)\s*\)/
rgb = m.slice 1,4
for i in [0..2]
rgb[i] = +rgb[i]
rgb[3] = 1 # default alpha
# rgba(250,20,0,0.4)
else if m = css.match /rgba\(\s*(\-?\d+),\s*(\-?\d+)\s*,\s*(\-?\d+)\s*,\s*([01]|[01]?\.\d+)\)/
rgb = m.slice 1,5
for i in [0..3]
rgb[i] = +rgb[i]
# rgb(100%,0%,0%)
else if m = css.match /rgb\(\s*(\-?\d+(?:\.\d+)?)%,\s*(\-?\d+(?:\.\d+)?)%\s*,\s*(\-?\d+(?:\.\d+)?)%\s*\)/
rgb = m.slice 1,4
for i in [0..2]
rgb[i] = Math.round rgb[i] * 2.55
rgb[3] = 1 # default alpha
# rgba(100%,0%,0%,0.4)
else if m = css.match /rgba\(\s*(\-?\d+(?:\.\d+)?)%,\s*(\-?\d+(?:\.\d+)?)%\s*,\s*(\-?\d+(?:\.\d+)?)%\s*,\s*([01]|[01]?\.\d+)\)/
rgb = m.slice 1,5
for i in [0..2]
rgb[i] = Math.round rgb[i] * 2.55
rgb[3] = +rgb[3]
# hsl(0,100%,50%)
else if m = css.match /hsl\(\s*(\-?\d+(?:\.\d+)?),\s*(\-?\d+(?:\.\d+)?)%\s*,\s*(\-?\d+(?:\.\d+)?)%\s*\)/
hsl = m.slice 1,4
hsl[1] *= 0.01
hsl[2] *= 0.01
rgb = hsl2rgb hsl
rgb[3] = 1
# hsla(0,100%,50%,0.5)
else if m = css.match /hsla\(\s*(\-?\d+(?:\.\d+)?),\s*(\-?\d+(?:\.\d+)?)%\s*,\s*(\-?\d+(?:\.\d+)?)%\s*,\s*([01]|[01]?\.\d+)\)/
hsl = m.slice 1,4
hsl[1] *= 0.01
hsl[2] *= 0.01
rgb = hsl2rgb hsl
rgb[3] = +m[4] # default alpha = 1
rgb
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