Function tagLength

inline.go:931–1005

return the length of the given tag, or 0 is it's not valid

(data []byte)

// return the length of the given tag, or 0 is it's not valid
func tagLength(data []byte) (autolink autolinkType, end int) {
	var i, j int

	// a valid tag can't be shorter than 3 chars
	if len(data) < 3 {
		return notAutolink, 0
	}

	// begins with a '<' optionally followed by '/', followed by letter or number
	if data[0] != '<' {
		return notAutolink, 0
	}
	if data[1] == '/' {
		i = 2
	} else {
		i = 1
	}

	if !isalnum(data[i]) {
		return notAutolink, 0
	}

	// scheme test
	autolink = notAutolink

	// try to find the beginning of an URI
	for i < len(data) && (isalnum(data[i]) || data[i] == '.' || data[i] == '+' || data[i] == '-') {
		i++
	}

	if i > 1 && i < len(data) && data[i] == '@' {
		if j = isMailtoAutoLink(data[i:]); j != 0 {
			return emailAutolink, i + j
		}
	}

	if i > 2 && i < len(data) && data[i] == ':' {
		autolink = normalAutolink
		i++
	}

	// complete autolink test: no whitespace or ' or "
	switch {
	case i >= len(data):
		autolink = notAutolink
	case autolink != notAutolink:
		j = i

		for i < len(data) {
			if data[i] == '\\' {
				i += 2
			} else if data[i] == '>' || data[i] == '\'' || data[i] == '"' || isspace(data[i]) {
				break
			} else {
				i++
			}

		}