Go Language CSS Color Parser Library

Go library for parsing CSS color string as defined in the W3C's CSS Color Module Level 4.

Supported Color Format

• Named colors
• RGB hexadecimal (with and without # prefix)
  • Short format #rgb
  • Short format with alpha #rgba
  • Long format #rrggbb
  • Long format with alpha #rrggbbaa
• rgb() and rgba()
• hsl() and hsla()
• hwb()
• oklab()
• oklch()
• hwba(), hsv(), hsva() - not in CSS standard.

Not yet supported: lab(), lch().

Example Color Format

transparent
lime
#0f0
#0f0f
#00ff00
#00ff00ff
rgb(0,255,0)
rgb(0% 100% 0%)
rgb(0 255 0 / 100%)
rgba(0,255,0,1)
hsl(120,100%,50%)
hsl(120deg 100% 50%)
hsl(-240 100% 50%)
hsl(-240deg 100% 50%)
hsl(0.3333turn 100% 50%)
hsl(133.333grad 100% 50%)
hsl(2.0944rad 100% 50%)
hsla(120,100%,50%,100%)
hwb(120 0% 0%)
hwb(480deg 0% 0% / 100%)
hsv(120,100%,100%)
hsv(120deg 100% 100% / 100%)

Usage Examples

import "github.com/mazznoer/csscolorparser"

c, err := csscolorparser.Parse("gold")

if err != nil {
    panic(err)
}

fmt.Printf("R:%.3f, G:%.3f, B:%.3f, A:%.3f", c.R, c.G, c.B, c.A) // R:1.000, G:0.843, B:0.000, A:1.000
fmt.Println(c.RGBA255())   // 255 215 0 255
fmt.Println(c.HexString()) // #ffd700
fmt.Println(c.RGBString()) // rgb(255,215,0)

Try It Online

• Playground 1
• Playground 2

Similar Projects

• csscolorparser (Rust)
• csscolorparser (Javascript)