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