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79 lines
1.8 KiB
Go
79 lines
1.8 KiB
Go
package nstr
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import "unicode"
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// RuneIsLower checks if a character is lower case ('a' to 'z')
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func RuneIsLower(c rune) bool {
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return 'a' <= c && c <= 'z'
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}
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// RuneToLower converts a character 'A' to 'Z' to its lower case
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func RuneToLower(r rune) rune {
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if r >= 'A' && r <= 'Z' {
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return r + 32
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}
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return r
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}
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// RuneToLowerAll converts a character 'A' to 'Z' to its lower case
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func RuneToLowerAll(rs []rune) []rune {
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for i := range rs {
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rs[i] = RuneToLower(rs[i])
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}
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return rs
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}
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// RuneIsUpper checks if a character is upper case ('A' to 'Z')
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func RuneIsUpper(c rune) bool {
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return 'A' <= c && c <= 'Z'
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}
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// RuneToUpper converts a character 'a' to 'z' to its upper case
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func RuneToUpper(r rune) rune {
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if r >= 'a' && r <= 'z' {
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return r - 32
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}
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return r
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}
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// RuneToUpperAll converts a character 'a' to 'z' to its upper case
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func RuneToUpperAll(rs []rune) []rune {
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for i := range rs {
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rs[i] = RuneToUpper(rs[i])
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}
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return rs
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}
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// RuneIsDigit checks if a character is digit ('0' to '9')
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func RuneIsDigit(r rune) bool {
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return r >= '0' && r <= '9'
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}
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// RuneIsLetter checks r is a letter but not CJK character.
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func RuneIsLetter(r rune) bool {
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if !unicode.IsLetter(r) {
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return false
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}
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switch {
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// cjk char: /[\u3040-\u30ff\u3400-\u4dbf\u4e00-\u9fff\uf900-\ufaff\uff66-\uff9f]/
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// hiragana and katakana (Japanese only)
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case r >= '\u3034' && r < '\u30ff':
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return false
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// CJK unified ideographs extension A (Chinese, Japanese, and Korean)
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case r >= '\u3400' && r < '\u4dbf':
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return false
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// CJK unified ideographs (Chinese, Japanese, and Korean)
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case r >= '\u4e00' && r < '\u9fff':
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return false
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// CJK compatibility ideographs (Chinese, Japanese, and Korean)
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case r >= '\uf900' && r < '\ufaff':
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return false
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// half-width katakana (Japanese only)
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case r >= '\uff66' && r < '\uff9f':
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return false
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}
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return true
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}
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