Function EachKey

parser.go:399–589

SYS-REQ-008, SYS-REQ-085

(data []byte, cb func(int, []byte, ValueType, error), paths ...[]string)

// SYS-REQ-008, SYS-REQ-085
func EachKey(data []byte, cb func(int, []byte, ValueType, error), paths ...[]string) int {
	var x struct{}
	var level, pathsMatched, i int
	ln := len(data)

	pathFlags := make([]bool, stackArraySize)[:]
	if len(paths) > cap(pathFlags) {
		pathFlags = make([]bool, len(paths))[:]
	}
	pathFlags = pathFlags[0:len(paths)]

	var maxPath int
	for _, p := range paths {
		if len(p) > maxPath {
			maxPath = len(p)
		}
	}

	pathsBuf := make([]string, stackArraySize)[:]
	if maxPath > cap(pathsBuf) {
		pathsBuf = make([]string, maxPath)[:]
	}
	pathsBuf = pathsBuf[0:maxPath]

	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, and key level match
			if data[i] == ':' {
				match := -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 {
					var stackbuf [unescapeStackBufSize]byte
					if ku, err := Unescape(key, stackbuf[:]); err != nil {