Rust CSS Color Parser Library

Documentation • Changelog • Features

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

Supported Color Format

Absolute Color

• 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()
• lab()
• lch()
• oklab()
• oklch()
• color(srgb ...)
• color(srgb-linear ...)
• hwba(), hsv(), hsva() - not in CSS standard.

Relative Color

Example:

rgb(from red r g calc(b + 20))
rgb(from gold calc(((r + g) + b) / 3) 127 127)
hwb(from #bad455 calc(h + 35) w b)
hsl(from purple h s l / 0.5)

Relative Color Format Limitations

Doesn't support percentage.

calc() only support the following expression:

[OPERAND] [OPERATOR] [OPERAND]

OPERAND can be a number, a variable (r, g, b, alpha etc. depends on color function) or another expression wrapped in parenthesis. OPERATOR is one of +, -, * or /.

Not Supported

rgb(from #bad455 100% g b)
rgb(from #bad455 r g b / 50%)
rgb(from #bad455 calc(r+g-30) 90 b)

OK

rgb(from #bad455 255 g b)
rgb(from #bad455 r g b / 0.5)
rgb(from #bad455 calc(r+15) 90 b)
rgb(from #bad455 calc((r+g)-30) 90 b)
hwb(from rgb(from rgb(100% 0% 50%) r g 75) calc(h+25) w b)

Usage

Add this to your Cargo.toml

csscolorparser = "0.9"

Examples

Using csscolorparser::parse() function.

let c = csscolorparser::parse("rgb(100%,0%,0%)")?;

assert_eq!(c.to_array(), [1.0, 0.0, 0.0, 1.0]);
assert_eq!(c.to_rgba8(), [255, 0, 0, 255]);
assert_eq!(c.to_css_hex().to_string(), "#ff0000");
assert_eq!(c.to_css_rgb().to_string(), "rgb(255 0 0)");
assert_eq!(c.name(), Some("red"));

Using parse() method on &str.

use csscolorparser::Color;

let c: Color = "#ff00007f".parse()?;

assert_eq!(c.to_rgba8(), [255, 0, 0, 127]);
assert_eq!(c.to_css_hex().to_string(), "#ff00007f");

Features

Default

• std: Using the standard library.
• named-colors: Enables parsing from named colors.

Default features can be disabled using default-features = false.

Optional

• rust-rgb: Enables converting from rgb crate types into Color.
• cint: Enables converting cint crate types to and from Color.
• serde: Enables serializing (into HEX string) and deserializing (from any supported string color format) using serde framework.

Similar Projects

• csscolorparser (Go)
• csscolorparser (Javascript)