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package colors
import (
"errors"
"strings"
)
var (
// ErrBadColor is the default bad color error
ErrBadColor = errors.New("Parsing of color failed, Bad Color")
)
// Color is the base color interface from which all others ascribe to
type Color interface {
ToHEX() *HEXColor
ToRGB() *RGBColor
ToRGBA() *RGBAColor
String() string
IsLight() bool // http://stackoverflow.com/a/24213274/3158232 and http://www.nbdtech.com/Blog/archive/2008/04/27/Calculating-the-Perceived-Brightness-of-a-Color.aspx
IsDark() bool //for perceived luminance, not strict math
}
// Parse parses an unknown color type to it's appropriate type, or returns a ErrBadColor
func Parse(s string) (Color, error) {
if len(s) < 4 {
return nil, ErrBadColor
}
s = strings.ToLower(s)
if s[:1] == "#" {
return ParseHEX(s)
} else if s[:4] == "rgba" {
return ParseRGBA(s)
} else if s[:3] == "rgb" {
return ParseRGB(s)
}
return nil, ErrBadColor
}
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