Function calcAllocateSpace

parser.go:817–857

SYS-REQ-009, SYS-REQ-111

(keys []string, setValue []byte, comma, object bool)

// SYS-REQ-009, SYS-REQ-111
func calcAllocateSpace(keys []string, setValue []byte, comma, object bool) int {
	// guard: empty key component — not an array index.
	isIndex := len(keys[0]) > 0 && string(keys[0][0]) == "["
	lk := 0
	if comma {
		// ,
		lk += 1
	}
	if isIndex && !comma {
		// []
		lk += 2
	} else {
		if object {
			// {
			lk += 1
		}
		if !isIndex {
			// "keys[0]"
			lk += len(keys[0]) + 3
		}
	}

	lk += len(setValue)
	for i := 1; i < len(keys); i++ {
		// guard: empty key component — treat as object key, not array index.
		if len(keys[i]) > 0 && string(keys[i][0]) == "[" {
			// []
			lk += 2
		} else {
			// {"keys[i]":setValue}
			lk += len(keys[i]) + 5
		}
	}

	if object && !isIndex {
		// }
		lk += 1
	}

	return lk
}

// SYS-REQ-009
func WriteToBuffer(buffer []byte, str string) int {