2016-06-07 09:28:36 -05:00
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// Copyright 2016 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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2017-06-30 13:34:53 -05:00
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use std::collections::range::RangeArgument;
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2016-06-09 17:49:07 -05:00
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use std::fmt::Debug;
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2016-06-07 09:28:36 -05:00
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use std::iter::{self, FromIterator};
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use std::slice;
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use std::marker::PhantomData;
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2017-06-30 13:34:53 -05:00
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use std::ops::{Index, IndexMut, Range};
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2016-06-07 09:28:36 -05:00
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use std::fmt;
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use std::vec;
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2016-06-28 15:41:09 -05:00
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use std::u32;
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2016-06-07 09:28:36 -05:00
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use rustc_serialize as serialize;
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/// Represents some newtyped `usize` wrapper.
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///
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/// (purpose: avoid mixing indexes for different bitvector domains.)
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2016-06-09 17:49:07 -05:00
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pub trait Idx: Copy + 'static + Eq + Debug {
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fn new(idx: usize) -> Self;
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fn index(self) -> usize;
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}
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impl Idx for usize {
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fn new(idx: usize) -> Self { idx }
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fn index(self) -> usize { self }
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}
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2016-06-28 15:41:09 -05:00
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impl Idx for u32 {
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fn new(idx: usize) -> Self { assert!(idx <= u32::MAX as usize); idx as u32 }
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fn index(self) -> usize { self as usize }
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}
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2016-06-07 09:28:36 -05:00
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#[derive(Clone)]
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pub struct IndexVec<I: Idx, T> {
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pub raw: Vec<T>,
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_marker: PhantomData<Fn(&I)>
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}
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impl<I: Idx, T: serialize::Encodable> serialize::Encodable for IndexVec<I, T> {
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fn encode<S: serialize::Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
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serialize::Encodable::encode(&self.raw, s)
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}
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}
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impl<I: Idx, T: serialize::Decodable> serialize::Decodable for IndexVec<I, T> {
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fn decode<D: serialize::Decoder>(d: &mut D) -> Result<Self, D::Error> {
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serialize::Decodable::decode(d).map(|v| {
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IndexVec { raw: v, _marker: PhantomData }
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})
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}
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}
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impl<I: Idx, T: fmt::Debug> fmt::Debug for IndexVec<I, T> {
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fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
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fmt::Debug::fmt(&self.raw, fmt)
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}
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}
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pub type Enumerated<I, J> = iter::Map<iter::Enumerate<J>, IntoIdx<I>>;
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impl<I: Idx, T> IndexVec<I, T> {
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#[inline]
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pub fn new() -> Self {
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IndexVec { raw: Vec::new(), _marker: PhantomData }
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}
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#[inline]
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pub fn with_capacity(capacity: usize) -> Self {
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IndexVec { raw: Vec::with_capacity(capacity), _marker: PhantomData }
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}
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#[inline]
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pub fn from_elem<S>(elem: T, universe: &IndexVec<I, S>) -> Self
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where T: Clone
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{
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IndexVec { raw: vec![elem; universe.len()], _marker: PhantomData }
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}
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2016-06-09 17:49:07 -05:00
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#[inline]
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pub fn from_elem_n(elem: T, n: usize) -> Self
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where T: Clone
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{
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IndexVec { raw: vec![elem; n], _marker: PhantomData }
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}
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#[inline]
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pub fn push(&mut self, d: T) -> I {
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let idx = I::new(self.len());
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self.raw.push(d);
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idx
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}
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#[inline]
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pub fn len(&self) -> usize {
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self.raw.len()
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}
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#[inline]
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pub fn is_empty(&self) -> bool {
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self.raw.is_empty()
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}
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#[inline]
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pub fn into_iter(self) -> vec::IntoIter<T> {
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self.raw.into_iter()
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}
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#[inline]
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pub fn into_iter_enumerated(self) -> Enumerated<I, vec::IntoIter<T>>
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{
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self.raw.into_iter().enumerate().map(IntoIdx { _marker: PhantomData })
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}
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#[inline]
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pub fn iter(&self) -> slice::Iter<T> {
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self.raw.iter()
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}
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#[inline]
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pub fn iter_enumerated(&self) -> Enumerated<I, slice::Iter<T>>
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{
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self.raw.iter().enumerate().map(IntoIdx { _marker: PhantomData })
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}
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2016-06-07 13:20:50 -05:00
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#[inline]
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pub fn indices(&self) -> iter::Map<Range<usize>, IntoIdx<I>> {
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(0..self.len()).map(IntoIdx { _marker: PhantomData })
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}
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2016-06-07 09:28:36 -05:00
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#[inline]
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pub fn iter_mut(&mut self) -> slice::IterMut<T> {
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self.raw.iter_mut()
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}
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#[inline]
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pub fn iter_enumerated_mut(&mut self) -> Enumerated<I, slice::IterMut<T>>
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{
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self.raw.iter_mut().enumerate().map(IntoIdx { _marker: PhantomData })
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}
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2017-02-08 03:19:22 -06:00
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#[inline]
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pub fn drain<'a, R: RangeArgument<usize>>(
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&'a mut self, range: R) -> impl Iterator<Item=T> + 'a {
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self.raw.drain(range)
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}
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#[inline]
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pub fn drain_enumerated<'a, R: RangeArgument<usize>>(
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&'a mut self, range: R) -> impl Iterator<Item=(I, T)> + 'a {
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self.raw.drain(range).enumerate().map(IntoIdx { _marker: PhantomData })
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}
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2016-06-07 09:28:36 -05:00
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#[inline]
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pub fn last(&self) -> Option<I> {
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self.len().checked_sub(1).map(I::new)
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}
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2016-08-15 20:59:50 -05:00
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#[inline]
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pub fn shrink_to_fit(&mut self) {
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self.raw.shrink_to_fit()
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}
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#[inline]
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pub fn swap(&mut self, a: usize, b: usize) {
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self.raw.swap(a, b)
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}
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#[inline]
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pub fn truncate(&mut self, a: usize) {
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self.raw.truncate(a)
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}
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2017-02-08 03:19:22 -06:00
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#[inline]
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pub fn get(&self, index: I) -> Option<&T> {
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self.raw.get(index.index())
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}
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#[inline]
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pub fn get_mut(&mut self, index: I) -> Option<&mut T> {
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self.raw.get_mut(index.index())
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}
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}
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2017-03-14 09:49:28 -05:00
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impl<I: Idx, T: Clone> IndexVec<I, T> {
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#[inline]
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pub fn resize(&mut self, new_len: usize, value: T) {
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self.raw.resize(new_len, value)
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}
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}
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2016-06-07 09:28:36 -05:00
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impl<I: Idx, T> Index<I> for IndexVec<I, T> {
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type Output = T;
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#[inline]
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fn index(&self, index: I) -> &T {
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&self.raw[index.index()]
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}
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}
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impl<I: Idx, T> IndexMut<I> for IndexVec<I, T> {
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#[inline]
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fn index_mut(&mut self, index: I) -> &mut T {
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&mut self.raw[index.index()]
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}
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}
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2017-05-23 15:47:15 -05:00
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impl<I: Idx, T> Default for IndexVec<I, T> {
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#[inline]
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fn default() -> Self {
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Self::new()
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}
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}
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2016-06-07 09:28:36 -05:00
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impl<I: Idx, T> Extend<T> for IndexVec<I, T> {
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#[inline]
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fn extend<J: IntoIterator<Item = T>>(&mut self, iter: J) {
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self.raw.extend(iter);
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}
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}
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impl<I: Idx, T> FromIterator<T> for IndexVec<I, T> {
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#[inline]
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fn from_iter<J>(iter: J) -> Self where J: IntoIterator<Item=T> {
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IndexVec { raw: FromIterator::from_iter(iter), _marker: PhantomData }
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}
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}
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impl<I: Idx, T> IntoIterator for IndexVec<I, T> {
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type Item = T;
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type IntoIter = vec::IntoIter<T>;
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#[inline]
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fn into_iter(self) -> vec::IntoIter<T> {
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self.raw.into_iter()
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}
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}
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impl<'a, I: Idx, T> IntoIterator for &'a IndexVec<I, T> {
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type Item = &'a T;
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type IntoIter = slice::Iter<'a, T>;
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#[inline]
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fn into_iter(self) -> slice::Iter<'a, T> {
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self.raw.iter()
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}
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}
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impl<'a, I: Idx, T> IntoIterator for &'a mut IndexVec<I, T> {
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type Item = &'a mut T;
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type IntoIter = slice::IterMut<'a, T>;
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#[inline]
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fn into_iter(mut self) -> slice::IterMut<'a, T> {
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self.raw.iter_mut()
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}
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}
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pub struct IntoIdx<I: Idx> { _marker: PhantomData<fn(&I)> }
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impl<I: Idx, T> FnOnce<((usize, T),)> for IntoIdx<I> {
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type Output = (I, T);
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extern "rust-call" fn call_once(self, ((n, t),): ((usize, T),)) -> Self::Output {
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(I::new(n), t)
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}
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}
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impl<I: Idx, T> FnMut<((usize, T),)> for IntoIdx<I> {
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extern "rust-call" fn call_mut(&mut self, ((n, t),): ((usize, T),)) -> Self::Output {
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(I::new(n), t)
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}
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}
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impl<I: Idx> FnOnce<(usize,)> for IntoIdx<I> {
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type Output = I;
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extern "rust-call" fn call_once(self, (n,): (usize,)) -> Self::Output {
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I::new(n)
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}
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}
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impl<I: Idx> FnMut<(usize,)> for IntoIdx<I> {
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extern "rust-call" fn call_mut(&mut self, (n,): (usize,)) -> Self::Output {
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I::new(n)
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}
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}
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