| // Copyright 2016 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| use std::fmt::Debug; |
| use std::iter::{self, FromIterator}; |
| use std::slice; |
| use std::marker::PhantomData; |
| use std::ops::{Index, IndexMut, Range}; |
| use std::fmt; |
| use std::vec; |
| use std::u32; |
| |
| use rustc_serialize as serialize; |
| |
| /// Represents some newtyped `usize` wrapper. |
| /// |
| /// (purpose: avoid mixing indexes for different bitvector domains.) |
| pub trait Idx: Copy + 'static + Eq + Debug { |
| fn new(usize) -> Self; |
| fn index(self) -> usize; |
| } |
| |
| impl Idx for usize { |
| fn new(idx: usize) -> Self { idx } |
| fn index(self) -> usize { self } |
| } |
| |
| impl Idx for u32 { |
| fn new(idx: usize) -> Self { assert!(idx <= u32::MAX as usize); idx as u32 } |
| fn index(self) -> usize { self as usize } |
| } |
| |
| #[derive(Clone)] |
| pub struct IndexVec<I: Idx, T> { |
| pub raw: Vec<T>, |
| _marker: PhantomData<Fn(&I)> |
| } |
| |
| impl<I: Idx, T: serialize::Encodable> serialize::Encodable for IndexVec<I, T> { |
| fn encode<S: serialize::Encoder>(&self, s: &mut S) -> Result<(), S::Error> { |
| serialize::Encodable::encode(&self.raw, s) |
| } |
| } |
| |
| impl<I: Idx, T: serialize::Decodable> serialize::Decodable for IndexVec<I, T> { |
| fn decode<D: serialize::Decoder>(d: &mut D) -> Result<Self, D::Error> { |
| serialize::Decodable::decode(d).map(|v| { |
| IndexVec { raw: v, _marker: PhantomData } |
| }) |
| } |
| } |
| |
| impl<I: Idx, T: fmt::Debug> fmt::Debug for IndexVec<I, T> { |
| fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { |
| fmt::Debug::fmt(&self.raw, fmt) |
| } |
| } |
| |
| pub type Enumerated<I, J> = iter::Map<iter::Enumerate<J>, IntoIdx<I>>; |
| |
| impl<I: Idx, T> IndexVec<I, T> { |
| #[inline] |
| pub fn new() -> Self { |
| IndexVec { raw: Vec::new(), _marker: PhantomData } |
| } |
| |
| #[inline] |
| pub fn with_capacity(capacity: usize) -> Self { |
| IndexVec { raw: Vec::with_capacity(capacity), _marker: PhantomData } |
| } |
| |
| #[inline] |
| pub fn from_elem<S>(elem: T, universe: &IndexVec<I, S>) -> Self |
| where T: Clone |
| { |
| IndexVec { raw: vec![elem; universe.len()], _marker: PhantomData } |
| } |
| |
| #[inline] |
| pub fn from_elem_n(elem: T, n: usize) -> Self |
| where T: Clone |
| { |
| IndexVec { raw: vec![elem; n], _marker: PhantomData } |
| } |
| |
| #[inline] |
| pub fn push(&mut self, d: T) -> I { |
| let idx = I::new(self.len()); |
| self.raw.push(d); |
| idx |
| } |
| |
| #[inline] |
| pub fn len(&self) -> usize { |
| self.raw.len() |
| } |
| |
| #[inline] |
| pub fn is_empty(&self) -> bool { |
| self.raw.is_empty() |
| } |
| |
| #[inline] |
| pub fn into_iter(self) -> vec::IntoIter<T> { |
| self.raw.into_iter() |
| } |
| |
| #[inline] |
| pub fn into_iter_enumerated(self) -> Enumerated<I, vec::IntoIter<T>> |
| { |
| self.raw.into_iter().enumerate().map(IntoIdx { _marker: PhantomData }) |
| } |
| |
| #[inline] |
| pub fn iter(&self) -> slice::Iter<T> { |
| self.raw.iter() |
| } |
| |
| #[inline] |
| pub fn iter_enumerated(&self) -> Enumerated<I, slice::Iter<T>> |
| { |
| self.raw.iter().enumerate().map(IntoIdx { _marker: PhantomData }) |
| } |
| |
| #[inline] |
| pub fn indices(&self) -> iter::Map<Range<usize>, IntoIdx<I>> { |
| (0..self.len()).map(IntoIdx { _marker: PhantomData }) |
| } |
| |
| #[inline] |
| pub fn iter_mut(&mut self) -> slice::IterMut<T> { |
| self.raw.iter_mut() |
| } |
| |
| #[inline] |
| pub fn iter_enumerated_mut(&mut self) -> Enumerated<I, slice::IterMut<T>> |
| { |
| self.raw.iter_mut().enumerate().map(IntoIdx { _marker: PhantomData }) |
| } |
| |
| #[inline] |
| pub fn last(&self) -> Option<I> { |
| self.len().checked_sub(1).map(I::new) |
| } |
| } |
| |
| impl<I: Idx, T> Index<I> for IndexVec<I, T> { |
| type Output = T; |
| |
| #[inline] |
| fn index(&self, index: I) -> &T { |
| &self.raw[index.index()] |
| } |
| } |
| |
| impl<I: Idx, T> IndexMut<I> for IndexVec<I, T> { |
| #[inline] |
| fn index_mut(&mut self, index: I) -> &mut T { |
| &mut self.raw[index.index()] |
| } |
| } |
| |
| impl<I: Idx, T> Extend<T> for IndexVec<I, T> { |
| #[inline] |
| fn extend<J: IntoIterator<Item = T>>(&mut self, iter: J) { |
| self.raw.extend(iter); |
| } |
| } |
| |
| impl<I: Idx, T> FromIterator<T> for IndexVec<I, T> { |
| #[inline] |
| fn from_iter<J>(iter: J) -> Self where J: IntoIterator<Item=T> { |
| IndexVec { raw: FromIterator::from_iter(iter), _marker: PhantomData } |
| } |
| } |
| |
| impl<I: Idx, T> IntoIterator for IndexVec<I, T> { |
| type Item = T; |
| type IntoIter = vec::IntoIter<T>; |
| |
| #[inline] |
| fn into_iter(self) -> vec::IntoIter<T> { |
| self.raw.into_iter() |
| } |
| |
| } |
| |
| impl<'a, I: Idx, T> IntoIterator for &'a IndexVec<I, T> { |
| type Item = &'a T; |
| type IntoIter = slice::Iter<'a, T>; |
| |
| #[inline] |
| fn into_iter(self) -> slice::Iter<'a, T> { |
| self.raw.iter() |
| } |
| } |
| |
| impl<'a, I: Idx, T> IntoIterator for &'a mut IndexVec<I, T> { |
| type Item = &'a mut T; |
| type IntoIter = slice::IterMut<'a, T>; |
| |
| #[inline] |
| fn into_iter(mut self) -> slice::IterMut<'a, T> { |
| self.raw.iter_mut() |
| } |
| } |
| |
| pub struct IntoIdx<I: Idx> { _marker: PhantomData<fn(&I)> } |
| impl<I: Idx, T> FnOnce<((usize, T),)> for IntoIdx<I> { |
| type Output = (I, T); |
| |
| extern "rust-call" fn call_once(self, ((n, t),): ((usize, T),)) -> Self::Output { |
| (I::new(n), t) |
| } |
| } |
| |
| impl<I: Idx, T> FnMut<((usize, T),)> for IntoIdx<I> { |
| extern "rust-call" fn call_mut(&mut self, ((n, t),): ((usize, T),)) -> Self::Output { |
| (I::new(n), t) |
| } |
| } |
| |
| impl<I: Idx> FnOnce<(usize,)> for IntoIdx<I> { |
| type Output = I; |
| |
| extern "rust-call" fn call_once(self, (n,): (usize,)) -> Self::Output { |
| I::new(n) |
| } |
| } |
| |
| impl<I: Idx> FnMut<(usize,)> for IntoIdx<I> { |
| extern "rust-call" fn call_mut(&mut self, (n,): (usize,)) -> Self::Output { |
| I::new(n) |
| } |
| } |