Function searchKeysConfig

parser.go:445–620

SYS-REQ-115

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

// SYS-REQ-115
func searchKeysConfig(config Config, 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 {
		// Fast-skip non-structural bytes before dispatching to the switch.
		// Skip control/whitespace (<= 0x20) and bytes > 0x5C that are not '{'
		// (0x7B) or '}' (0x7D) — the only structural chars handled below that
		// exceed the 0x5C threshold. '"' (0x22), '\'' (0x27), '[' (0x5B) and
		// ':' (0x3A) are all <= 0x5C and always reach the switch. This is the
		// gjson key-scan trick: a single unsigned comparison advances past
		// value content (true/false/null letters, high bytes) and indentation.
		for i < ln {
			c := data[i]
			if c <= ' ' {
				i++
				continue
			}
			if c > '\\' && c != '{' && c != '}' {
				i++
				continue
			}
			break
		}
		if i >= ln {
			break
		}
		switch data[i] {
		case '"', '\'':
			quote := data[i]
			if quote == '\'' && !config.AllowSingleQuotes {
				break
			}
			i++
			keyBegin := i

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

			valueOffset := nextTokenConfig(config, data[i:])
			if valueOffset == -1 {
				return -1
			}