Function splitTextToWords

segmenter.go:258–291

将文本划分成字元

(text Text)

// 将文本划分成字元
func splitTextToWords(text Text) []Text {
	output := make([]Text, 0, len(text)/3)
	current := 0
	inAlphanumeric := true
	alphanumericStart := 0
	for current < len(text) {
		r, size := utf8.DecodeRune(text[current:])
		if size <= 2 && (unicode.IsLetter(r) || unicode.IsNumber(r)) {
			// 当前是拉丁字母或数字（非中日韩文字）
			if !inAlphanumeric {
				alphanumericStart = current
				inAlphanumeric = true
			}
		} else {
			if inAlphanumeric {
				inAlphanumeric = false
				if current != 0 {
					output = append(output, toLower(text[alphanumericStart:current]))
				}
			}
			output = append(output, text[current:current+size])
		}
		current += size
	}

	// 处理最后一个字元是英文的情况
	if inAlphanumeric {
		if current != 0 {
			output = append(output, toLower(text[alphanumericStart:current]))
		}
	}

	return output
}

// 将英文词转化为小写
func toLower(text []byte) []byte {