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26 lines
464 B
Go
26 lines
464 B
Go
package clean
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import (
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"strings"
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)
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// Color sanitizes HTML color codes and returns them in lowercase if they are valid, or an empty string otherwise.
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func Color(s string) string {
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s = strings.ToLower(s)
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// Remove unwanted characters.
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s = strings.Map(func(r rune) rune {
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if (r < '0' || r > '9') && (r < 'a' || r > 'f') && r != '#' {
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return -1
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}
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return r
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}, s)
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// Invalid?
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if l := len(s); l != 4 && l != 7 && l != 9 {
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return ""
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}
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return s
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}
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