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make triedbmut lookup shorter

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This commit is contained in:
debris 2017-08-29 12:31:40 +02:00
parent e390e6b0af
commit 100d1c7bf6
1 changed files with 31 additions and 46 deletions
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77
util/src/trie/triedbmut.rs
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@ -370,62 +370,47 @@ impl<'a> TrieDBMut<'a> {
fn lookup<'x, 'key>(&'x self, mut partial: NibbleSlice<'key>, handle: &NodeHandle) -> super::Result<Option<DBValue>>
where 'x: 'key
{
enum Step<'s> {
Return(Option<DBValue>),
Lookup(usize, &'s NodeHandle),
}
let mut handle = handle;
loop {
let step = {
match *handle {
NodeHandle::Hash(ref hash) => {
let lookup = Lookup {
db: &*self.db,
query: DBValue::from_slice,
hash: hash.clone(),
}.look_up(partial)?;
Step::Return(lookup)
},
NodeHandle::InMemory(ref handle) => match self.storage[handle] {
Node::Empty => Step::Return(None),
Node::Leaf(ref key, ref value) => {
if NibbleSlice::from_encoded(key).0 == partial {
Step::Return(Some(DBValue::from_slice(value)))
} else {
Step::Return(None)
}
let (mid, child) = match *handle {
NodeHandle::Hash(ref hash) => return Lookup {
db: &*self.db,
query: DBValue::from_slice,
hash: hash.clone(),
}.look_up(partial),
NodeHandle::InMemory(ref handle) => match self.storage[handle] {
Node::Empty => return Ok(None),
Node::Leaf(ref key, ref value) => {
if NibbleSlice::from_encoded(key).0 == partial {
return Ok(Some(DBValue::from_slice(value)));
} else {
return Ok(None);
}
Node::Extension(ref slice, ref child) => {
let slice = NibbleSlice::from_encoded(slice).0;
if partial.starts_with(&slice) {
Step::Lookup(slice.len(), child)
} else {
Step::Return(None)
}
}
Node::Extension(ref slice, ref child) => {
let slice = NibbleSlice::from_encoded(slice).0;
if partial.starts_with(&slice) {
(slice.len(), child)
} else {
return Ok(None);
}
Node::Branch(ref children, ref value) => {
if partial.is_empty() {
Step::Return(value.as_ref().map(|v| DBValue::from_slice(v)))
} else {
let idx = partial.at(0);
match children[idx as usize].as_ref() {
Some(child) => Step::Lookup(1, child),
None => Step::Return(None),
}
}
Node::Branch(ref children, ref value) => {
if partial.is_empty() {
return Ok(value.as_ref().map(|v| DBValue::from_slice(v)));
} else {
let idx = partial.at(0);
match children[idx as usize].as_ref() {
Some(child) => (1, child),
None => return Ok(None),
}
}
}
}
};
match step {
Step::Return(r) => return Ok(r),
Step::Lookup(mid, child) => {
partial = partial.mid(mid);
handle = child;
}
}
partial = partial.mid(mid);
handle = child;
}
}