65 lines
1.2 KiB
Go
65 lines
1.2 KiB
Go
package rate
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import (
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"strconv"
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"strings"
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"unicode/utf16"
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)
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func StringIsEmojiOnly(emoji string) bool {
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runes := []rune(emoji)
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// Slice of runes is 2, since some emojis have 2 runes.
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switch len(runes) {
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case 0:
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return false
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case 1, 2:
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return EmojiRune(runes[0])
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// case 2:
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// return EmojiRune(runes[0]) && EmojiRune(runes[1])
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default:
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return false
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}
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}
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func StringIsCustomEmoji(emoji string) bool {
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parts := strings.Split(emoji, ":")
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if len(parts) != 2 {
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return false
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}
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// Validate ID
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_, err := strconv.Atoi(parts[1])
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if err != nil {
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return false
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}
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// Validate name, shouldn't have whitespaces
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if strings.ContainsRune(parts[0], ' ') {
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return false
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}
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return true
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}
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var surrogates = [...][2]rune{ // [0] from, [1] to
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{utf16.DecodeRune(0xD83C, 0xD000), utf16.DecodeRune(0xD83C, 0xDFFF)},
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{utf16.DecodeRune(0xD83E, 0xD000), utf16.DecodeRune(0xD83E, 0xDFFF)},
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{utf16.DecodeRune(0xD83F, 0xD000), utf16.DecodeRune(0xD83F, 0xDFFF)},
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}
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func EmojiRune(r rune) bool {
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b := r == '\u00a9' || r == '\u00ae' ||
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(r >= '\u2000' && r <= '\u3300')
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if b {
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return true
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}
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for _, surrogate := range surrogates {
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if surrogate[0] <= r && r <= surrogate[1] {
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return true
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}
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}
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return false
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}
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