48 lines
1.0 KiB
Go
48 lines
1.0 KiB
Go
package css
|
|
|
|
import "github.com/tdewolff/parse/v2"
|
|
|
|
// IsIdent returns true if the bytes are a valid identifier.
|
|
func IsIdent(b []byte) bool {
|
|
l := NewLexer(parse.NewInputBytes(b))
|
|
l.consumeIdentToken()
|
|
l.r.Restore()
|
|
return l.r.Pos() == len(b)
|
|
}
|
|
|
|
// IsURLUnquoted returns true if the bytes are a valid unquoted URL.
|
|
func IsURLUnquoted(b []byte) bool {
|
|
l := NewLexer(parse.NewInputBytes(b))
|
|
l.consumeUnquotedURL()
|
|
l.r.Restore()
|
|
return l.r.Pos() == len(b)
|
|
}
|
|
|
|
// HSL2RGB converts HSL to RGB with all of range [0,1]
|
|
// from http://www.w3.org/TR/css3-color/#hsl-color
|
|
func HSL2RGB(h, s, l float64) (float64, float64, float64) {
|
|
m2 := l * (s + 1)
|
|
if l > 0.5 {
|
|
m2 = l + s - l*s
|
|
}
|
|
m1 := l*2 - m2
|
|
return hue2rgb(m1, m2, h+1.0/3.0), hue2rgb(m1, m2, h), hue2rgb(m1, m2, h-1.0/3.0)
|
|
}
|
|
|
|
func hue2rgb(m1, m2, h float64) float64 {
|
|
if h < 0.0 {
|
|
h += 1.0
|
|
}
|
|
if h > 1.0 {
|
|
h -= 1.0
|
|
}
|
|
if h*6.0 < 1.0 {
|
|
return m1 + (m2-m1)*h*6.0
|
|
} else if h*2.0 < 1.0 {
|
|
return m2
|
|
} else if h*3.0 < 2.0 {
|
|
return m1 + (m2-m1)*(2.0/3.0-h)*6.0
|
|
}
|
|
return m1
|
|
}
|