Function searchKeys

parser.go:231–378

SYS-REQ-001, SYS-REQ-020, SYS-REQ-021, SYS-REQ-022, SYS-REQ-023, SYS-REQ-047

(data []byte, keys ...string)

// SYS-REQ-001, SYS-REQ-020, SYS-REQ-021, SYS-REQ-022, SYS-REQ-023, SYS-REQ-047
func searchKeys(data []byte, keys ...string) int {
	keyLevel := 0
	level := 0
	i := 0
	ln := len(data)
	lk := len(keys)
	lastMatched := true

	if lk == 0 {
		return 0
	}

	var stackbuf [unescapeStackBufSize]byte // stack-allocated array for allocation-free unescaping of small strings

	for i < ln {
		switch data[i] {
		case '"':
			i++
			keyBegin := i

			strEnd, keyEscaped := stringEnd(data[i:])
			if strEnd == -1 {
				return -1
			}
			i += strEnd
			keyEnd := i - 1

			valueOffset := nextToken(data[i:])
			if valueOffset == -1 {
				return -1
			}

			i += valueOffset

			// if string is a key
			if data[i] == ':' {
				if level < 1 {
					return -1
				}

				key := data[keyBegin:keyEnd]

				// for unescape: if there are no escape sequences, this is cheap; if there are, it is a
				// bit more expensive, but causes no allocations unless len(key) > unescapeStackBufSize
				var keyUnesc []byte
				if !keyEscaped {
					keyUnesc = key
				} else if ku, err := Unescape(key, stackbuf[:]); err != nil {
					return -1
				} else {
					keyUnesc = ku
				}

				if level <= len(keys) {
					if equalStr(&keyUnesc, keys[level-1]) {
						lastMatched = true

						// if key level match