package stt

import "bytes"

// ReadString read string from iterator
func (iter *Iterator) ReadString() (ret string) {
	depthEnding := encryptBytes([]byte{'/'}, iter.depth)
	depthEndingLen := len(depthEnding)
	for i := iter.head; i < iter.tail; i++ {
		if iter.depth > 1 {
			if i+depthEndingLen >= iter.tail {
				return
			}
			endings := iter.buf[i : i+depthEndingLen]
			if bytes.Equal(endings, depthEnding) {
				ret = string(iter.buf[iter.head:i])
				iter.head = i
				break
			}
		} else {
			c := iter.buf[i]
			if c == '/' {
				ret = string(iter.buf[iter.head:i])
				iter.head = i
				break
			}
		}
	}
	ret = string(decryptBytes([]byte(ret), iter.depth))
	return
}

func (iter *Iterator) ReadFieldName() (ret string) {
	// key@=value/
	for i := iter.head; i < iter.tail; i++ {
		c := iter.buf[i]
		if c == '@' {
			ret = string(iter.buf[iter.head:i])
			iter.head = i
			return ret
		}
	}
	return
}