2015-07-07 00:54:22 +00:00
|
|
|
// Copyright 2014 The go-ethereum Authors
|
2015-07-22 16:48:40 +00:00
|
|
|
// This file is part of the go-ethereum library.
|
2015-07-07 00:54:22 +00:00
|
|
|
//
|
2015-07-23 16:35:11 +00:00
|
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
2015-07-07 00:54:22 +00:00
|
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
|
|
// (at your option) any later version.
|
|
|
|
//
|
2015-07-22 16:48:40 +00:00
|
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
2015-07-07 00:54:22 +00:00
|
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
2015-07-22 16:48:40 +00:00
|
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
2015-07-07 00:54:22 +00:00
|
|
|
// GNU Lesser General Public License for more details.
|
|
|
|
//
|
|
|
|
// You should have received a copy of the GNU Lesser General Public License
|
2015-07-22 16:48:40 +00:00
|
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
2015-07-07 00:54:22 +00:00
|
|
|
|
2014-10-31 13:45:03 +00:00
|
|
|
package trie
|
2014-10-10 14:56:28 +00:00
|
|
|
|
2015-07-05 23:19:48 +00:00
|
|
|
import "bytes"
|
2014-10-10 14:56:28 +00:00
|
|
|
|
|
|
|
type Iterator struct {
|
|
|
|
trie *Trie
|
|
|
|
|
|
|
|
Key []byte
|
2015-01-08 10:47:04 +00:00
|
|
|
Value []byte
|
2014-10-10 14:56:28 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
func NewIterator(trie *Trie) *Iterator {
|
2015-03-05 01:42:32 +00:00
|
|
|
return &Iterator{trie: trie, Key: nil}
|
2014-10-10 14:56:28 +00:00
|
|
|
}
|
|
|
|
|
2015-01-08 10:47:04 +00:00
|
|
|
func (self *Iterator) Next() bool {
|
2015-03-05 01:42:32 +00:00
|
|
|
isIterStart := false
|
|
|
|
if self.Key == nil {
|
|
|
|
isIterStart = true
|
|
|
|
self.Key = make([]byte, 32)
|
|
|
|
}
|
|
|
|
|
2015-07-05 23:19:48 +00:00
|
|
|
key := remTerm(compactHexDecode(self.Key))
|
2015-03-05 01:42:32 +00:00
|
|
|
k := self.next(self.trie.root, key, isIterStart)
|
2014-10-10 14:56:28 +00:00
|
|
|
|
2015-07-05 23:19:48 +00:00
|
|
|
self.Key = []byte(decodeCompact(k))
|
2014-10-10 14:56:28 +00:00
|
|
|
|
2015-01-08 10:47:04 +00:00
|
|
|
return len(k) > 0
|
2014-10-10 14:56:28 +00:00
|
|
|
}
|
|
|
|
|
2015-07-05 23:19:48 +00:00
|
|
|
func (self *Iterator) next(node interface{}, key []byte, isIterStart bool) []byte {
|
2015-01-08 10:47:04 +00:00
|
|
|
if node == nil {
|
2014-10-10 14:56:28 +00:00
|
|
|
return nil
|
2015-01-08 10:47:04 +00:00
|
|
|
}
|
2014-10-10 14:56:28 +00:00
|
|
|
|
2015-01-08 10:47:04 +00:00
|
|
|
switch node := node.(type) {
|
2015-07-05 23:19:48 +00:00
|
|
|
case fullNode:
|
2015-01-08 10:47:04 +00:00
|
|
|
if len(key) > 0 {
|
2015-07-05 23:19:48 +00:00
|
|
|
k := self.next(node[key[0]], key[1:], isIterStart)
|
2015-01-08 10:47:04 +00:00
|
|
|
if k != nil {
|
|
|
|
return append([]byte{key[0]}, k...)
|
2014-10-10 14:56:28 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2015-01-08 10:47:04 +00:00
|
|
|
var r byte
|
2014-10-10 14:56:28 +00:00
|
|
|
if len(key) > 0 {
|
|
|
|
r = key[0] + 1
|
|
|
|
}
|
|
|
|
|
|
|
|
for i := r; i < 16; i++ {
|
2015-07-05 23:19:48 +00:00
|
|
|
k := self.key(node[i])
|
2015-01-08 10:47:04 +00:00
|
|
|
if k != nil {
|
|
|
|
return append([]byte{i}, k...)
|
2014-10-10 14:56:28 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2015-07-05 23:19:48 +00:00
|
|
|
case shortNode:
|
|
|
|
k := remTerm(node.Key)
|
|
|
|
if vnode, ok := node.Val.(valueNode); ok {
|
2015-03-05 01:42:32 +00:00
|
|
|
switch bytes.Compare([]byte(k), key) {
|
|
|
|
case 0:
|
|
|
|
if isIterStart {
|
2015-07-05 23:19:48 +00:00
|
|
|
self.Value = vnode
|
2015-03-05 01:42:32 +00:00
|
|
|
return k
|
|
|
|
}
|
|
|
|
case 1:
|
2015-07-05 23:19:48 +00:00
|
|
|
self.Value = vnode
|
2014-10-10 14:56:28 +00:00
|
|
|
return k
|
|
|
|
}
|
|
|
|
} else {
|
2015-07-05 23:19:48 +00:00
|
|
|
cnode := node.Val
|
2015-01-08 10:47:04 +00:00
|
|
|
|
2014-10-10 14:56:28 +00:00
|
|
|
var ret []byte
|
2015-01-08 10:47:04 +00:00
|
|
|
skey := key[len(k):]
|
2015-07-05 23:19:48 +00:00
|
|
|
if bytes.HasPrefix(key, k) {
|
2015-03-05 01:42:32 +00:00
|
|
|
ret = self.next(cnode, skey, isIterStart)
|
2014-10-10 14:56:28 +00:00
|
|
|
} else if bytes.Compare(k, key[:len(k)]) > 0 {
|
2015-02-07 16:03:22 +00:00
|
|
|
return self.key(node)
|
2014-10-10 14:56:28 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
if ret != nil {
|
|
|
|
return append(k, ret...)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2015-07-05 23:19:48 +00:00
|
|
|
case hashNode:
|
|
|
|
return self.next(self.trie.resolveHash(node), key, isIterStart)
|
|
|
|
}
|
2014-10-10 14:56:28 +00:00
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
2015-07-05 23:19:48 +00:00
|
|
|
func (self *Iterator) key(node interface{}) []byte {
|
2015-01-08 10:47:04 +00:00
|
|
|
switch node := node.(type) {
|
2015-07-05 23:19:48 +00:00
|
|
|
case shortNode:
|
2015-01-08 10:47:04 +00:00
|
|
|
// Leaf node
|
2015-07-05 23:19:48 +00:00
|
|
|
k := remTerm(node.Key)
|
|
|
|
if vnode, ok := node.Val.(valueNode); ok {
|
|
|
|
self.Value = vnode
|
2015-01-08 10:47:04 +00:00
|
|
|
return k
|
|
|
|
}
|
2015-07-05 23:19:48 +00:00
|
|
|
return append(k, self.key(node.Val)...)
|
|
|
|
case fullNode:
|
|
|
|
if node[16] != nil {
|
|
|
|
self.Value = node[16].(valueNode)
|
2015-01-08 10:47:04 +00:00
|
|
|
return []byte{16}
|
|
|
|
}
|
|
|
|
for i := 0; i < 16; i++ {
|
2015-07-05 23:19:48 +00:00
|
|
|
k := self.key(node[i])
|
2015-01-08 10:47:04 +00:00
|
|
|
if k != nil {
|
|
|
|
return append([]byte{byte(i)}, k...)
|
|
|
|
}
|
|
|
|
}
|
2015-07-05 23:19:48 +00:00
|
|
|
case hashNode:
|
|
|
|
return self.key(self.trie.resolveHash(node))
|
2015-01-08 10:47:04 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
return nil
|
2014-10-10 14:56:28 +00:00
|
|
|
}
|