src/librustc_data_structures/indexed_vec.rs - third_party/rust - Git at Google

 // 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::collections::range::RangeArgument;
 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(idx: 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 }
 }

 #[macro_export]
 macro_rules! newtype_index {
     // ---- public rules ----

     // Use default constants
     ($name:ident) => (
         newtype_index!(
             @type[$name]
             @max[::std::u32::MAX]
             @debug_name[unsafe {::std::intrinsics::type_name::<$name>() }]);
     );

     // Define any constants
     ($name:ident { $($tokens:tt)+ }) => (
         newtype_index!(
             @type[$name]
             @max[::std::u32::MAX]
             @debug_name[unsafe {::std::intrinsics::type_name::<$name>() }]
             $($tokens)+);
     );

     // ---- private rules ----

     // Base case, user-defined constants (if any) have already been defined
     (@type[$type:ident] @max[$max:expr] @debug_name[$debug_name:expr]) => (
         #[derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord,
             RustcEncodable, RustcDecodable)]
         pub struct $type(pub u32);

         impl Idx for $type {
             fn new(value: usize) -> Self {
                 assert!(value < ($max) as usize);
                 $type(value as u32)
             }
             fn index(self) -> usize {
                 self.0 as usize
             }
         }

         impl ::std::fmt::Debug for $type {
             fn fmt(&self, fmt: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
                 write!(fmt, "{}{}", $debug_name, self.0)
             }
         }
     );

     // Rewrite final without comma to one that includes comma
     (@type[$type:ident] @max[$max:expr] @debug_name[$debug_name:expr]
             $name:ident = $constant:expr) => (
         newtype_index!(@type[$type] @max[$max] @debug_name[$debug_name] $name = $constant,);
     );

     // Rewrite final const without comma to one that includes comma
     (@type[$type:ident] @max[$_max:expr] @debug_name[$debug_name:expr]
             const $name:ident = $constant:expr) => (
         newtype_index!(@type[$type] @max[$max] @debug_name[$debug_name] const $name = $constant,);
     );

     // Replace existing default for max
     (@type[$type:ident] @max[$_max:expr] @debug_name[$debug_name:expr]
             MAX = $max:expr, $($tokens:tt)*) => (
         newtype_index!(@type[$type] @max[$max] @debug_name[$debug_name] $($tokens)*);
     );

     // Replace existing default for debug_name
     (@type[$type:ident] @max[$max:expr] @debug_name[$_debug_name:expr]
             DEBUG_NAME = $debug_name:expr, $($tokens:tt)*) => (
         newtype_index!(@type[$type] @max[$max] @debug_name[$debug_name] $($tokens)*);
     );

     // Assign a user-defined constant (as final param)
     (@type[$type:ident] @max[$max:expr] @debug_name[$debug_name:expr]
             const $name:ident = $constant:expr, $($tokens:tt)*) => (
         pub const $name: $type = $type($constant);
         newtype_index!(@type[$type] @max[$max] @debug_name[$debug_name] $($tokens)*);
     );
 }

 #[derive(Clone, PartialEq, Eq)]
 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 drain<'a, R: RangeArgument<usize>>(
         &'a mut self, range: R) -> impl Iterator<Item=T> + 'a {
         self.raw.drain(range)
     }

     #[inline]
     pub fn drain_enumerated<'a, R: RangeArgument<usize>>(
         &'a mut self, range: R) -> impl Iterator<Item=(I, T)> + 'a {
         self.raw.drain(range).enumerate().map(IntoIdx { _marker: PhantomData })
     }

     #[inline]
     pub fn last(&self) -> Option<I> {
         self.len().checked_sub(1).map(I::new)
     }

     #[inline]
     pub fn shrink_to_fit(&mut self) {
         self.raw.shrink_to_fit()
     }

     #[inline]
     pub fn swap(&mut self, a: usize, b: usize) {
         self.raw.swap(a, b)
     }

     #[inline]
     pub fn truncate(&mut self, a: usize) {
         self.raw.truncate(a)
     }

     #[inline]
     pub fn get(&self, index: I) -> Option<&T> {
         self.raw.get(index.index())
     }

     #[inline]
     pub fn get_mut(&mut self, index: I) -> Option<&mut T> {
         self.raw.get_mut(index.index())
     }
 }

 impl<I: Idx, T: Clone> IndexVec<I, T> {
     #[inline]
     pub fn resize(&mut self, new_len: usize, value: T) {
         self.raw.resize(new_len, value)
     }
 }

 impl<I: Idx, T: Ord> IndexVec<I, T> {
     #[inline]
     pub fn binary_search(&self, value: &T) -> Result<I, I> {
         match self.raw.binary_search(value) {
             Ok(i) => Ok(Idx::new(i)),
             Err(i) => Err(Idx::new(i)),
         }
     }
 }

 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> Default for IndexVec<I, T> {
     #[inline]
     fn default() -> Self {
         Self::new()
     }
 }

 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(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)
     }
 }
	// 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::collections::range::RangeArgument;
	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(idx: 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 }
	}

	#[macro_export]
	macro_rules! newtype_index {
	// ---- public rules ----

	// Use default constants
	($name:ident) => (
	newtype_index!(
	@type[$name]
	@max[::std::u32::MAX]
	@debug_name[unsafe {::std::intrinsics::type_name::<$name>() }]);
	);

	// Define any constants
	($name:ident { $($tokens:tt)+ }) => (
	newtype_index!(
	@type[$name]
	@max[::std::u32::MAX]
	@debug_name[unsafe {::std::intrinsics::type_name::<$name>() }]
	$($tokens)+);
	);

	// ---- private rules ----

	// Base case, user-defined constants (if any) have already been defined
	(@type[$type:ident] @max[$max:expr] @debug_name[$debug_name:expr]) => (
	#[derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord,
	RustcEncodable, RustcDecodable)]
	pub struct $type(pub u32);

	impl Idx for $type {
	fn new(value: usize) -> Self {
	assert!(value < ($max) as usize);
	$type(value as u32)
	}
	fn index(self) -> usize {
	self.0 as usize
	}
	}

	impl ::std::fmt::Debug for $type {
	fn fmt(&self, fmt: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
	write!(fmt, "{}{}", $debug_name, self.0)
	}
	}
	);

	// Rewrite final without comma to one that includes comma
	(@type[$type:ident] @max[$max:expr] @debug_name[$debug_name:expr]
	$name:ident = $constant:expr) => (
	newtype_index!(@type[$type] @max[$max] @debug_name[$debug_name] $name = $constant,);
	);

	// Rewrite final const without comma to one that includes comma
	(@type[$type:ident] @max[$_max:expr] @debug_name[$debug_name:expr]
	const $name:ident = $constant:expr) => (
	newtype_index!(@type[$type] @max[$max] @debug_name[$debug_name] const $name = $constant,);
	);

	// Replace existing default for max
	(@type[$type:ident] @max[$_max:expr] @debug_name[$debug_name:expr]
	MAX = $max:expr, $($tokens:tt)*) => (
	newtype_index!(@type[$type] @max[$max] @debug_name[$debug_name] $($tokens)*);
	);

	// Replace existing default for debug_name
	(@type[$type:ident] @max[$max:expr] @debug_name[$_debug_name:expr]
	DEBUG_NAME = $debug_name:expr, $($tokens:tt)*) => (
	newtype_index!(@type[$type] @max[$max] @debug_name[$debug_name] $($tokens)*);
	);

	// Assign a user-defined constant (as final param)
	(@type[$type:ident] @max[$max:expr] @debug_name[$debug_name:expr]
	const $name:ident = $constant:expr, $($tokens:tt)*) => (
	pub const $name: $type = $type($constant);
	newtype_index!(@type[$type] @max[$max] @debug_name[$debug_name] $($tokens)*);
	);
	}

	#[derive(Clone, PartialEq, Eq)]
	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 drain<'a, R: RangeArgument<usize>>(
	&'a mut self, range: R) -> impl Iterator<Item=T> + 'a {
	self.raw.drain(range)
	}

	#[inline]
	pub fn drain_enumerated<'a, R: RangeArgument<usize>>(
	&'a mut self, range: R) -> impl Iterator<Item=(I, T)> + 'a {
	self.raw.drain(range).enumerate().map(IntoIdx { _marker: PhantomData })
	}

	#[inline]
	pub fn last(&self) -> Option<I> {
	self.len().checked_sub(1).map(I::new)
	}

	#[inline]
	pub fn shrink_to_fit(&mut self) {
	self.raw.shrink_to_fit()
	}

	#[inline]
	pub fn swap(&mut self, a: usize, b: usize) {
	self.raw.swap(a, b)
	}

	#[inline]
	pub fn truncate(&mut self, a: usize) {
	self.raw.truncate(a)
	}

	#[inline]
	pub fn get(&self, index: I) -> Option<&T> {
	self.raw.get(index.index())
	}

	#[inline]
	pub fn get_mut(&mut self, index: I) -> Option<&mut T> {
	self.raw.get_mut(index.index())
	}
	}

	impl<I: Idx, T: Clone> IndexVec<I, T> {
	#[inline]
	pub fn resize(&mut self, new_len: usize, value: T) {
	self.raw.resize(new_len, value)
	}
	}

	impl<I: Idx, T: Ord> IndexVec<I, T> {
	#[inline]
	pub fn binary_search(&self, value: &T) -> Result<I, I> {
	match self.raw.binary_search(value) {
	Ok(i) => Ok(Idx::new(i)),
	Err(i) => Err(Idx::new(i)),
	}
	}
	}

	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> Default for IndexVec<I, T> {
	#[inline]
	fn default() -> Self {
	Self::new()
	}
	}

	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(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)
	}
	}