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encoding.utf8: add pub fn is_letter(r rune) bool (#11547)

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ChAoS_UnItY 2021-09-21 02:16:50 +08:00 • committed by GitHub
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19
vlib/encoding/utf8/utf8_util.v
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@ -141,6 +141,25 @@ pub fn is_punct(s string, index int) bool {
return is_uchar_punct(get_uchar(s, index))
}
// is_control return true if the rune is control code
pub fn is_control(r rune) bool {
// control codes are all below 0xff
if r > max_latin_1 {
return false
}
return props[byte(r)] == 1
}
// is_letter returns true if the rune is unicode letter or in unicode category L
pub fn is_letter(r rune) bool {
if (r >= `a` && r <= `z`) || (r >= `A` && r <= `Z`) {
return true
} else if r <= max_latin_1 {
return props[byte(r)] & p_l_mask != 0
}
return is_excluding_latin(letter_table, r)
}
// is_uchar_punct return true if the input unicode is a western unicode punctuation
pub fn is_uchar_punct(uchar int) bool {
return find_punct_in_table(uchar, utf8.unicode_punct_western) != 0