package word_count

const (
	KindOther = iota
	KindLatin
	KindNum
	KindPun
	KindHan
)

func Kind(c rune) int {
	switch {
	// Chars in Basic Latin aka. ASCII
	case ('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z'):
		return KindLatin

	case ('0' <= c && c <= '9'):
		return KindNum

	// Synbols in Basic Latin aka. ASCII
	case ('\u0021' <= c && c <= '\u002F') || ('\u003A' <= c && c <= '\u0040') || ('\u005B' <= c && c <= '\u0060') || ('\u007B' <= c && c <= '\u007E'):
		return KindPun

	// Latin-1 Punctuatio & Symbols
	case ('\u00A1' <= c && c <= '\u00BF'):
		return KindPun

	// Unicode symbols
	case ('\u2013' <= c && c <= '\u201E'):
		return KindPun

	// CJK Symbols and Punctuation
	case ('\u3001' <= c && c <= '\u303F') || c == '\u2026' || c == '\u2032' || c == '\u2033':
		return KindPun

	// Halfwidth and Fullwidth Forms
	case ('\uFF01' <= c && c <= '\uFF0F') || ('\uFF1A' <= c && c <= '\uFF20') || ('\uFF3B' <= c && c <= '\uFF40') || ('\uFF5B' <= c && c <= '\uFF65'):
		return KindPun

	// CJK Unified Ideographs block
	case ('\u4E00' <= c && c <= '\u62FF') || ('\u6300' <= c && c <= '\u77FF') || ('\u7800' <= c && c <= '\u8CFF') || ('\u8D00' <= c && c <= '\u9FCC'):
		return KindHan

	// CJK Unified Ideographs block Ext A block
	case ('\u3400' <= c && c <= '\u4D85'):
		return KindHan

	// CJKUI Ext B block
	// CJKUI Ext C block
	// CJKUI Ext D block
	// CJKUI Ext E block
	// block above will be ignored cause there's barely text font support them

	default:
		return KindOther
	}
}