111 lines
3 KiB
Rust
111 lines
3 KiB
Rust
#[doc = "
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A simple map based on a vector for small integer keys. Space requirements
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are O(highest integer key).
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"];
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import core::option;
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import core::option::{some, none};
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import dvec::{dvec, extensions};
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// FIXME: Should not be @; there's a bug somewhere in rustc that requires this
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// to be. (#2347)
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type smallintmap<T: copy> = @{v: dvec<option<T>>};
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#[doc = "Create a smallintmap"]
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fn mk<T: copy>() -> smallintmap<T> {
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ret @{v: dvec()};
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}
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#[doc = "
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Add a value to the map. If the map already contains a value for
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the specified key then the original value is replaced.
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"]
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#[inline(always)]
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fn insert<T: copy>(self: smallintmap<T>, key: uint, val: T) {
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self.v.grow_set_elt(key, none, some(val));
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}
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#[doc = "
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Get the value for the specified key. If the key does not exist
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in the map then returns none
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"]
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fn find<T: copy>(self: smallintmap<T>, key: uint) -> option<T> {
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if key < self.v.len() { ret self.v.get_elt(key); }
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ret none::<T>;
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}
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#[doc = "
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Get the value for the specified key
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# Failure
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If the key does not exist in the map
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"]
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fn get<T: copy>(self: smallintmap<T>, key: uint) -> T {
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alt find(self, key) {
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none { #error("smallintmap::get(): key not present"); fail; }
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some(v) { ret v; }
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}
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}
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#[doc = "
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Returns true if the map contains a value for the specified key
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"]
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fn contains_key<T: copy>(self: smallintmap<T>, key: uint) -> bool {
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ret !option::is_none(find(self, key));
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}
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#[doc = "Implements the map::map interface for smallintmap"]
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impl <V: copy> of map::map<uint, V> for smallintmap<V> {
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fn size() -> uint {
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let mut sz = 0u;
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for self.v.each {|item|
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alt item { some(_) { sz += 1u; } _ {} }
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}
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sz
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}
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#[inline(always)]
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fn insert(+key: uint, +value: V) -> bool {
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let exists = contains_key(self, key);
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insert(self, key, value);
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ret !exists;
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}
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fn remove(&&key: uint) -> option<V> {
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if key >= self.v.len() { ret none; }
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let old = self.v.get_elt(key);
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self.v.set_elt(key, none);
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old
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}
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fn contains_key(&&key: uint) -> bool {
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contains_key(self, key)
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}
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fn get(&&key: uint) -> V { get(self, key) }
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fn find(&&key: uint) -> option<V> { find(self, key) }
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fn rehash() { fail }
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fn each(it: fn(&&uint, V) -> bool) {
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let mut idx = 0u, l = self.v.len();
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while idx < l {
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alt self.v.get_elt(idx) {
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some(elt) {
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if !it(idx, elt) { break; }
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}
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none { }
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}
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idx += 1u;
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}
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}
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fn each_key(it: fn(&&uint) -> bool) {
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let mut idx = 0u, l = self.v.len();
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while idx < l {
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if self.v.get_elt(idx) != none && !it(idx) { ret; }
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idx += 1u;
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}
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}
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fn each_value(it: fn(V) -> bool) {
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self.each {|_i, v| it(v)}
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}
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}
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#[doc = "Cast the given smallintmap to a map::map"]
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fn as_map<V: copy>(s: smallintmap<V>) -> map::map<uint, V> {
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s as map::map::<uint, V>
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}
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