2013-03-02 13:41:31 -06:00
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// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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2013-03-24 23:22:23 -05:00
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//! An ordered map and set for integer keys implemented as a radix trie
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use prelude::*;
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2013-06-07 12:24:27 -05:00
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use iterator::IteratorUtil;
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use uint;
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use util::{swap, replace};
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2013-03-05 17:53:43 -06:00
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// FIXME: #5244: need to manually update the TrieNode constructor
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2013-03-22 16:00:15 -05:00
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static SHIFT: uint = 4;
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static SIZE: uint = 1 << SHIFT;
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static MASK: uint = SIZE - 1;
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enum Child<T> {
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Internal(~TrieNode<T>),
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External(uint, T),
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Nothing
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}
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2013-05-28 16:35:52 -05:00
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#[allow(missing_doc)]
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pub struct TrieMap<T> {
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priv root: TrieNode<T>,
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priv length: uint
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}
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impl<T> Container for TrieMap<T> {
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/// Return the number of elements in the map
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#[inline]
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fn len(&const self) -> uint { self.length }
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/// Return true if the map contains no elements
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#[inline]
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fn is_empty(&const self) -> bool { self.len() == 0 }
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}
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2013-03-05 17:53:43 -06:00
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impl<T> Mutable for TrieMap<T> {
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/// Clear the map, removing all values.
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#[inline]
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fn clear(&mut self) {
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self.root = TrieNode::new();
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self.length = 0;
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}
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}
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impl<T> Map<uint, T> for TrieMap<T> {
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/// Return true if the map contains a value for the specified key
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#[inline]
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fn contains_key(&self, key: &uint) -> bool {
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self.find(key).is_some()
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}
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/// Visit all key-value pairs in order
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#[inline]
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fn each<'a>(&'a self, f: &fn(&uint, &'a T) -> bool) -> bool {
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self.root.each(f)
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}
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/// Visit all keys in order
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#[inline]
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fn each_key(&self, f: &fn(&uint) -> bool) -> bool {
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self.each(|k, _| f(k))
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}
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2013-03-02 13:41:31 -06:00
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/// Visit all values in order
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#[inline]
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fn each_value<'a>(&'a self, f: &fn(&'a T) -> bool) -> bool {
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self.each(|_, v| f(v))
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}
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/// Iterate over the map and mutate the contained values
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#[inline]
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fn mutate_values(&mut self, f: &fn(&uint, &mut T) -> bool) -> bool {
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self.root.mutate_values(f)
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}
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/// Return a reference to the value corresponding to the key
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#[inline]
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fn find<'a>(&'a self, key: &uint) -> Option<&'a T> {
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let mut node: &'a TrieNode<T> = &self.root;
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let mut idx = 0;
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loop {
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match node.children[chunk(*key, idx)] {
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Internal(ref x) => node = &**x,
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External(stored, ref value) => {
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if stored == *key {
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return Some(value)
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} else {
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return None
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}
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}
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Nothing => return None
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}
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idx += 1;
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}
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}
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2013-03-24 19:40:17 -05:00
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/// Return a mutable reference to the value corresponding to the key
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#[inline]
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fn find_mut<'a>(&'a mut self, key: &uint) -> Option<&'a mut T> {
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find_mut(&mut self.root.children[chunk(*key, 0)], *key, 1)
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}
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2013-03-02 13:41:31 -06:00
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/// Insert a key-value pair into the map. An existing value for a
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/// key is replaced by the new value. Return true if the key did
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/// not already exist in the map.
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#[inline]
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fn insert(&mut self, key: uint, value: T) -> bool {
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self.swap(key, value).is_none()
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}
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/// Remove a key-value pair from the map. Return true if the key
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/// was present in the map, otherwise false.
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#[inline]
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fn remove(&mut self, key: &uint) -> bool {
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self.pop(key).is_some()
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}
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/// Insert a key-value pair from the map. If the key already had a value
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/// present in the map, that value is returned. Otherwise None is returned.
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fn swap(&mut self, key: uint, value: T) -> Option<T> {
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let ret = insert(&mut self.root.count,
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&mut self.root.children[chunk(key, 0)],
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key, value, 1);
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if ret.is_none() { self.length += 1 }
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ret
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}
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/// Removes a key from the map, returning the value at the key if the key
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/// was previously in the map.
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fn pop(&mut self, key: &uint) -> Option<T> {
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let ret = remove(&mut self.root.count,
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&mut self.root.children[chunk(*key, 0)],
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*key, 1);
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if ret.is_some() { self.length -= 1 }
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ret
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}
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}
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2013-05-31 17:17:22 -05:00
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impl<T> TrieMap<T> {
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/// Create an empty TrieMap
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#[inline]
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pub fn new() -> TrieMap<T> {
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TrieMap{root: TrieNode::new(), length: 0}
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}
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2013-04-06 10:22:36 -05:00
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/// Visit all key-value pairs in reverse order
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#[inline]
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pub fn each_reverse<'a>(&'a self, f: &fn(&uint, &'a T) -> bool) -> bool {
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self.root.each_reverse(f)
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}
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/// Visit all keys in reverse order
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#[inline]
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pub fn each_key_reverse(&self, f: &fn(&uint) -> bool) -> bool {
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self.each_reverse(|k, _| f(k))
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}
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/// Visit all values in reverse order
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#[inline]
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pub fn each_value_reverse(&self, f: &fn(&T) -> bool) -> bool {
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self.each_reverse(|_, v| f(v))
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}
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}
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2013-05-28 16:35:52 -05:00
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#[allow(missing_doc)]
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pub struct TrieSet {
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priv map: TrieMap<()>
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}
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impl BaseIter<uint> for TrieSet {
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/// Visit all values in order
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#[inline]
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fn each(&self, f: &fn(&uint) -> bool) -> bool { self.map.each_key(f) }
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#[inline]
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fn size_hint(&self) -> Option<uint> { Some(self.len()) }
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}
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impl ReverseIter<uint> for TrieSet {
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/// Visit all values in reverse order
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#[inline]
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fn each_reverse(&self, f: &fn(&uint) -> bool) -> bool {
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self.map.each_key_reverse(f)
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}
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}
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impl Container for TrieSet {
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/// Return the number of elements in the set
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#[inline]
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fn len(&const self) -> uint { self.map.len() }
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/// Return true if the set contains no elements
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#[inline]
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fn is_empty(&const self) -> bool { self.map.is_empty() }
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}
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impl Mutable for TrieSet {
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/// Clear the set, removing all values.
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#[inline]
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fn clear(&mut self) { self.map.clear() }
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}
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impl TrieSet {
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/// Create an empty TrieSet
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#[inline]
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pub fn new() -> TrieSet {
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TrieSet{map: TrieMap::new()}
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}
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/// Return true if the set contains a value
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#[inline]
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pub fn contains(&self, value: &uint) -> bool {
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self.map.contains_key(value)
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}
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/// Add a value to the set. Return true if the value was not already
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/// present in the set.
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#[inline]
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pub fn insert(&mut self, value: uint) -> bool {
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self.map.insert(value, ())
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}
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/// Remove a value from the set. Return true if the value was
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/// present in the set.
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#[inline]
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pub fn remove(&mut self, value: &uint) -> bool {
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self.map.remove(value)
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}
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}
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struct TrieNode<T> {
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count: uint,
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children: [Child<T>, ..SIZE]
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}
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2013-03-05 17:53:43 -06:00
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impl<T> TrieNode<T> {
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#[inline]
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fn new() -> TrieNode<T> {
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// FIXME: #5244: [Nothing, ..SIZE] should be possible without Copy
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TrieNode{count: 0,
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children: [Nothing, Nothing, Nothing, Nothing,
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Nothing, Nothing, Nothing, Nothing,
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Nothing, Nothing, Nothing, Nothing,
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Nothing, Nothing, Nothing, Nothing]}
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}
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}
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impl<T> TrieNode<T> {
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fn each<'a>(&'a self, f: &fn(&uint, &'a T) -> bool) -> bool {
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for uint::range(0, self.children.len()) |idx| {
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match self.children[idx] {
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Internal(ref x) => if !x.each(f) { return false },
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External(k, ref v) => if !f(&k, v) { return false },
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Nothing => ()
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}
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}
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true
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}
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fn each_reverse<'a>(&'a self, f: &fn(&uint, &'a T) -> bool) -> bool {
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for uint::range_rev(self.children.len(), 0) |idx| {
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match self.children[idx - 1] {
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Internal(ref x) => if !x.each_reverse(f) { return false },
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External(k, ref v) => if !f(&k, v) { return false },
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Nothing => ()
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}
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}
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true
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}
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fn mutate_values<'a>(&'a mut self, f: &fn(&uint, &mut T) -> bool) -> bool {
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for self.children.mut_iter().advance |child| {
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match *child {
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Internal(ref mut x) => if !x.mutate_values(f) {
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return false
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},
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External(k, ref mut v) => if !f(&k, v) { return false },
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Nothing => ()
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}
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}
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true
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}
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}
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|
|
|
|
|
// if this was done via a trait, the key could be generic
|
2013-06-18 16:45:18 -05:00
|
|
|
#[inline]
|
2013-03-21 23:20:48 -05:00
|
|
|
fn chunk(n: uint, idx: uint) -> uint {
|
2013-03-05 22:54:19 -06:00
|
|
|
let sh = uint::bits - (SHIFT * (idx + 1));
|
|
|
|
(n >> sh) & MASK
|
2013-03-02 13:41:31 -06:00
|
|
|
}
|
|
|
|
|
2013-05-06 22:29:54 -05:00
|
|
|
fn find_mut<'r, T>(child: &'r mut Child<T>, key: uint, idx: uint) -> Option<&'r mut T> {
|
|
|
|
match *child {
|
|
|
|
External(_, ref mut value) => Some(value),
|
|
|
|
Internal(ref mut x) => find_mut(&mut x.children[chunk(key, idx)], key, idx + 1),
|
|
|
|
Nothing => None
|
|
|
|
}
|
2013-03-24 19:30:35 -05:00
|
|
|
}
|
|
|
|
|
2013-03-13 16:07:23 -05:00
|
|
|
fn insert<T>(count: &mut uint, child: &mut Child<T>, key: uint, value: T,
|
2013-05-04 08:54:58 -05:00
|
|
|
idx: uint) -> Option<T> {
|
2013-03-05 17:53:43 -06:00
|
|
|
let mut tmp = Nothing;
|
2013-05-04 08:54:58 -05:00
|
|
|
let ret;
|
|
|
|
swap(&mut tmp, child);
|
2013-03-05 17:53:43 -06:00
|
|
|
|
|
|
|
*child = match tmp {
|
2013-03-02 13:41:31 -06:00
|
|
|
External(stored_key, stored_value) => {
|
|
|
|
if stored_key == key {
|
2013-05-04 08:54:58 -05:00
|
|
|
ret = Some(stored_value);
|
2013-03-05 17:53:43 -06:00
|
|
|
External(stored_key, value)
|
2013-03-02 13:41:31 -06:00
|
|
|
} else {
|
|
|
|
// conflict - split the node
|
|
|
|
let mut new = ~TrieNode::new();
|
|
|
|
insert(&mut new.count,
|
|
|
|
&mut new.children[chunk(stored_key, idx)],
|
|
|
|
stored_key, stored_value, idx + 1);
|
2013-05-04 08:54:58 -05:00
|
|
|
ret = insert(&mut new.count, &mut new.children[chunk(key, idx)],
|
|
|
|
key, value, idx + 1);
|
2013-03-05 17:53:43 -06:00
|
|
|
Internal(new)
|
2013-03-02 13:41:31 -06:00
|
|
|
}
|
|
|
|
}
|
2013-03-05 17:53:43 -06:00
|
|
|
Internal(x) => {
|
|
|
|
let mut x = x;
|
2013-05-04 08:54:58 -05:00
|
|
|
ret = insert(&mut x.count, &mut x.children[chunk(key, idx)], key,
|
|
|
|
value, idx + 1);
|
2013-03-05 17:53:43 -06:00
|
|
|
Internal(x)
|
2013-03-02 13:41:31 -06:00
|
|
|
}
|
|
|
|
Nothing => {
|
|
|
|
*count += 1;
|
2013-05-04 08:54:58 -05:00
|
|
|
ret = None;
|
2013-03-05 17:53:43 -06:00
|
|
|
External(key, value)
|
2013-03-02 13:41:31 -06:00
|
|
|
}
|
2013-03-05 17:53:43 -06:00
|
|
|
};
|
2013-05-04 08:54:58 -05:00
|
|
|
return ret;
|
2013-03-02 13:41:31 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
fn remove<T>(count: &mut uint, child: &mut Child<T>, key: uint,
|
2013-05-04 08:54:58 -05:00
|
|
|
idx: uint) -> Option<T> {
|
2013-03-02 13:41:31 -06:00
|
|
|
let (ret, this) = match *child {
|
2013-05-04 08:54:58 -05:00
|
|
|
External(stored, _) if stored == key => {
|
|
|
|
match replace(child, Nothing) {
|
|
|
|
External(_, value) => (Some(value), true),
|
|
|
|
_ => fail!()
|
|
|
|
}
|
2013-03-02 13:41:31 -06:00
|
|
|
}
|
2013-05-04 08:54:58 -05:00
|
|
|
External(*) => (None, false),
|
2013-03-02 13:41:31 -06:00
|
|
|
Internal(ref mut x) => {
|
|
|
|
let ret = remove(&mut x.count, &mut x.children[chunk(key, idx)],
|
|
|
|
key, idx + 1);
|
|
|
|
(ret, x.count == 0)
|
|
|
|
}
|
2013-05-04 08:54:58 -05:00
|
|
|
Nothing => (None, false)
|
2013-03-02 13:41:31 -06:00
|
|
|
};
|
|
|
|
|
|
|
|
if this {
|
|
|
|
*child = Nothing;
|
|
|
|
*count -= 1;
|
|
|
|
}
|
2013-05-04 08:54:58 -05:00
|
|
|
return ret;
|
2013-03-02 13:41:31 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
#[cfg(test)]
|
|
|
|
pub fn check_integrity<T>(trie: &TrieNode<T>) {
|
2013-03-28 20:39:09 -05:00
|
|
|
assert!(trie.count != 0);
|
2013-03-02 13:41:31 -06:00
|
|
|
|
|
|
|
let mut sum = 0;
|
|
|
|
|
|
|
|
for trie.children.each |x| {
|
|
|
|
match *x {
|
|
|
|
Nothing => (),
|
|
|
|
Internal(ref y) => {
|
|
|
|
check_integrity(&**y);
|
|
|
|
sum += 1
|
|
|
|
}
|
|
|
|
External(_, _) => { sum += 1 }
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2013-05-18 21:02:45 -05:00
|
|
|
assert_eq!(sum, trie.count);
|
2013-03-02 13:41:31 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
#[cfg(test)]
|
|
|
|
mod tests {
|
|
|
|
use super::*;
|
2013-03-24 19:30:35 -05:00
|
|
|
use core::option::{Some, None};
|
2013-03-02 13:41:31 -06:00
|
|
|
use uint;
|
|
|
|
|
2013-03-24 19:30:35 -05:00
|
|
|
#[test]
|
|
|
|
fn test_find_mut() {
|
|
|
|
let mut m = TrieMap::new();
|
2013-03-28 20:39:09 -05:00
|
|
|
assert!(m.insert(1, 12));
|
|
|
|
assert!(m.insert(2, 8));
|
|
|
|
assert!(m.insert(5, 14));
|
2013-03-24 19:30:35 -05:00
|
|
|
let new = 100;
|
|
|
|
match m.find_mut(&5) {
|
|
|
|
None => fail!(), Some(x) => *x = new
|
|
|
|
}
|
|
|
|
assert_eq!(m.find(&5), Some(&new));
|
|
|
|
}
|
|
|
|
|
2013-03-02 13:41:31 -06:00
|
|
|
#[test]
|
|
|
|
fn test_step() {
|
|
|
|
let mut trie = TrieMap::new();
|
|
|
|
let n = 300;
|
|
|
|
|
|
|
|
for uint::range_step(1, n, 2) |x| {
|
2013-03-28 20:39:09 -05:00
|
|
|
assert!(trie.insert(x, x + 1));
|
|
|
|
assert!(trie.contains_key(&x));
|
2013-03-02 13:41:31 -06:00
|
|
|
check_integrity(&trie.root);
|
|
|
|
}
|
|
|
|
|
|
|
|
for uint::range_step(0, n, 2) |x| {
|
2013-03-28 20:39:09 -05:00
|
|
|
assert!(!trie.contains_key(&x));
|
|
|
|
assert!(trie.insert(x, x + 1));
|
2013-03-02 13:41:31 -06:00
|
|
|
check_integrity(&trie.root);
|
|
|
|
}
|
|
|
|
|
|
|
|
for uint::range(0, n) |x| {
|
2013-03-28 20:39:09 -05:00
|
|
|
assert!(trie.contains_key(&x));
|
|
|
|
assert!(!trie.insert(x, x + 1));
|
2013-03-02 13:41:31 -06:00
|
|
|
check_integrity(&trie.root);
|
|
|
|
}
|
|
|
|
|
|
|
|
for uint::range_step(1, n, 2) |x| {
|
2013-03-28 20:39:09 -05:00
|
|
|
assert!(trie.remove(&x));
|
|
|
|
assert!(!trie.contains_key(&x));
|
2013-03-02 13:41:31 -06:00
|
|
|
check_integrity(&trie.root);
|
|
|
|
}
|
|
|
|
|
|
|
|
for uint::range_step(0, n, 2) |x| {
|
2013-03-28 20:39:09 -05:00
|
|
|
assert!(trie.contains_key(&x));
|
|
|
|
assert!(!trie.insert(x, x + 1));
|
2013-03-02 13:41:31 -06:00
|
|
|
check_integrity(&trie.root);
|
|
|
|
}
|
|
|
|
}
|
2013-03-05 08:35:45 -06:00
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn test_each() {
|
|
|
|
let mut m = TrieMap::new();
|
|
|
|
|
2013-03-28 20:39:09 -05:00
|
|
|
assert!(m.insert(3, 6));
|
|
|
|
assert!(m.insert(0, 0));
|
|
|
|
assert!(m.insert(4, 8));
|
|
|
|
assert!(m.insert(2, 4));
|
|
|
|
assert!(m.insert(1, 2));
|
2013-03-05 08:35:45 -06:00
|
|
|
|
|
|
|
let mut n = 0;
|
2013-04-06 10:22:36 -05:00
|
|
|
for m.each |k, v| {
|
2013-05-18 21:02:45 -05:00
|
|
|
assert_eq!(*k, n);
|
|
|
|
assert_eq!(*v, n * 2);
|
2013-03-05 08:35:45 -06:00
|
|
|
n += 1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2013-03-05 09:10:22 -06:00
|
|
|
#[test]
|
|
|
|
fn test_each_break() {
|
|
|
|
let mut m = TrieMap::new();
|
|
|
|
|
|
|
|
for uint::range_rev(uint::max_value, uint::max_value - 10000) |x| {
|
|
|
|
m.insert(x, x / 2);
|
|
|
|
}
|
|
|
|
|
|
|
|
let mut n = uint::max_value - 9999;
|
2013-04-06 10:22:36 -05:00
|
|
|
for m.each |k, v| {
|
2013-03-05 09:10:22 -06:00
|
|
|
if n == uint::max_value - 5000 { break }
|
2013-03-28 20:39:09 -05:00
|
|
|
assert!(n < uint::max_value - 5000);
|
2013-03-05 09:10:22 -06:00
|
|
|
|
2013-05-18 21:02:45 -05:00
|
|
|
assert_eq!(*k, n);
|
|
|
|
assert_eq!(*v, n / 2);
|
2013-03-05 09:10:22 -06:00
|
|
|
n += 1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2013-03-05 08:35:45 -06:00
|
|
|
#[test]
|
|
|
|
fn test_each_reverse() {
|
|
|
|
let mut m = TrieMap::new();
|
|
|
|
|
2013-03-28 20:39:09 -05:00
|
|
|
assert!(m.insert(3, 6));
|
|
|
|
assert!(m.insert(0, 0));
|
|
|
|
assert!(m.insert(4, 8));
|
|
|
|
assert!(m.insert(2, 4));
|
|
|
|
assert!(m.insert(1, 2));
|
2013-03-05 08:35:45 -06:00
|
|
|
|
|
|
|
let mut n = 4;
|
2013-04-06 10:22:36 -05:00
|
|
|
for m.each_reverse |k, v| {
|
2013-05-18 21:02:45 -05:00
|
|
|
assert_eq!(*k, n);
|
|
|
|
assert_eq!(*v, n * 2);
|
2013-03-05 08:35:45 -06:00
|
|
|
n -= 1;
|
|
|
|
}
|
|
|
|
}
|
2013-03-05 09:10:22 -06:00
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn test_each_reverse_break() {
|
|
|
|
let mut m = TrieMap::new();
|
|
|
|
|
|
|
|
for uint::range_rev(uint::max_value, uint::max_value - 10000) |x| {
|
|
|
|
m.insert(x, x / 2);
|
|
|
|
}
|
|
|
|
|
|
|
|
let mut n = uint::max_value;
|
2013-04-06 10:22:36 -05:00
|
|
|
for m.each_reverse |k, v| {
|
2013-03-05 09:10:22 -06:00
|
|
|
if n == uint::max_value - 5000 { break }
|
2013-03-28 20:39:09 -05:00
|
|
|
assert!(n > uint::max_value - 5000);
|
2013-03-05 09:10:22 -06:00
|
|
|
|
2013-05-18 21:02:45 -05:00
|
|
|
assert_eq!(*k, n);
|
|
|
|
assert_eq!(*v, n / 2);
|
2013-03-05 09:10:22 -06:00
|
|
|
n -= 1;
|
|
|
|
}
|
|
|
|
}
|
2013-03-15 20:43:54 -05:00
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn test_sane_chunk() {
|
|
|
|
let x = 1;
|
|
|
|
let y = 1 << (uint::bits - 1);
|
|
|
|
|
|
|
|
let mut trie = TrieSet::new();
|
|
|
|
|
2013-03-28 20:39:09 -05:00
|
|
|
assert!(trie.insert(x));
|
|
|
|
assert!(trie.insert(y));
|
2013-03-15 20:43:54 -05:00
|
|
|
|
2013-05-18 21:02:45 -05:00
|
|
|
assert_eq!(trie.len(), 2);
|
2013-03-15 20:43:54 -05:00
|
|
|
|
|
|
|
let expected = [x, y];
|
|
|
|
|
|
|
|
let mut i = 0;
|
|
|
|
|
|
|
|
for trie.each |x| {
|
2013-05-18 21:02:45 -05:00
|
|
|
assert_eq!(expected[i], *x);
|
2013-03-15 20:43:54 -05:00
|
|
|
i += 1;
|
|
|
|
}
|
|
|
|
}
|
2013-05-04 08:54:58 -05:00
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn test_swap() {
|
|
|
|
let mut m = TrieMap::new();
|
2013-05-18 21:02:45 -05:00
|
|
|
assert_eq!(m.swap(1, 2), None);
|
|
|
|
assert_eq!(m.swap(1, 3), Some(2));
|
|
|
|
assert_eq!(m.swap(1, 4), Some(3));
|
2013-05-04 08:54:58 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn test_pop() {
|
|
|
|
let mut m = TrieMap::new();
|
|
|
|
m.insert(1, 2);
|
2013-05-18 21:02:45 -05:00
|
|
|
assert_eq!(m.pop(&1), Some(2));
|
|
|
|
assert_eq!(m.pop(&1), None);
|
2013-05-04 08:54:58 -05:00
|
|
|
}
|
2013-03-02 13:41:31 -06:00
|
|
|
}
|