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// Copyright 2015 Joe Neeman.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// option. This file may not be copied, modified, or distributed
// except according to those terms.
extern crate num_traits;
#[cfg(test)]
extern crate num_iter;
#[cfg(test)]
extern crate quickcheck;
use num_traits::PrimInt;
use std::cmp::{max, min, Ordering};
use std::fmt::{Debug, Formatter};
use std::iter::FromIterator;
use std::{mem, usize};
const DISPLAY_LIMIT: usize = 10;
/// A range of elements, including the endpoints.
#[derive(Copy, Clone, Hash, PartialEq, PartialOrd, Eq, Ord)]
pub struct Range<T> {
pub start: T,
pub end: T,
}
impl<T: Debug> Debug for Range<T> {
fn fmt(&self, f: &mut Formatter) -> Result<(), std::fmt::Error> {
try!(self.start.fmt(f));
try!(f.write_str(" -- "));
try!(self.end.fmt(f));
Ok(())
}
}
impl<T: PrimInt> Range<T> {
/// Creates a new range with the given start and endpoints (inclusive).
///
/// # Panics
/// - if `start` is strictly larger than `end`
pub fn new(start: T, end: T) -> Range<T> {
if start > end {
panic!("Ranges must be ordered");
}
Range {
start: start,
end: end,
}
}
/// Creates a new range containing everything.
pub fn full() -> Range<T> {
Range {
start: T::min_value(),
end: T::max_value(),
}
}
/// Creates a new range containing a single thing.
pub fn single(x: T) -> Range<T> {
Range::new(x, x)
}
/// Tests whether a given element belongs to this range.
pub fn contains(&self, x: T) -> bool {
self.start <= x && x <= self.end
}
/// Checks whether the intersections overlap.
pub fn intersects(&self, other: &Self) -> bool {
self.start <= other.end && self.end >= other.start
}
/// Computes the intersection between two ranges. Returns none if the intersection is empty.
pub fn intersection(&self, other: &Self) -> Option<Self> {
if self.intersects(other) {
Some(Range::new(
max(self.start, other.start),
min(self.end, other.end),
))
} else {
None
}
}
/// Returns the smallest range that covers `self` and `other`.
pub fn cover(&self, other: &Self) -> Self {
Range::new(min(self.start, other.start), max(self.end, other.end))
}
}
impl<T: PrimInt> PartialEq<T> for Range<T> {
fn eq(&self, x: &T) -> bool {
self.contains(*x)
}
}
impl<T: PrimInt> PartialOrd<T> for Range<T> {
fn partial_cmp(&self, x: &T) -> Option<Ordering> {
if self.end < *x {
Some(Ordering::Less)
} else if self.start > *x {
Some(Ordering::Greater)
} else {
Some(Ordering::Equal)
}
}
}
/// When creating a [`RangeMap`] from a list of ranges and values, there's a possiblity that two
/// ranges will overlap. In this case, it's a problem if they want to be associated to different
/// values (because we don't know which value should be assigned to the intersection of the
/// ranges). An `OverlapError` is the result of such a situation. It contains two members. The
/// first is a [`RangeMap`] obtained by simply ignoring all the ranges that would cause a bad
/// overlap. The second is the collection of ranges that were ignored.
// TODO: an example
#[derive(Clone, Debug, Eq, Hash, PartialEq)]
pub struct OverlapError<T, V> {
pub non_overlapping: RangeMap<T, V>,
pub discarded: Vec<(Range<T>, V)>,
}
/// A set of characters. Optionally, each character in the set may be associated with some data.
#[derive(Clone, Eq, Hash, PartialEq)]
pub struct RangeMap<T, V> {
elts: Vec<(Range<T>, V)>,
}
impl<T: Debug, V: Debug> Debug for RangeMap<T, V> {
// When alternate formatting is specified, only prints out the first bunch of mappings.
fn fmt(&self, f: &mut Formatter) -> Result<(), std::fmt::Error> {
try!(f.write_fmt(format_args!("RangeMap (")));
if f.alternate() {
try!(f
.debug_map()
.entries(self.elts.iter().map(|x| (&x.0, &x.1)).take(DISPLAY_LIMIT))
.finish());
if self.elts.len() > DISPLAY_LIMIT {
try!(f.write_str("..."));
}
} else {
try!(f
.debug_map()
.entries(self.elts.iter().map(|x| (&x.0, &x.1)))
.finish());
}
try!(f.write_str(")"));
Ok(())
}
}
impl<T: Debug + PrimInt, V: Clone + Debug + Eq> FromIterator<(Range<T>, V)> for RangeMap<T, V> {
/// Builds a `RangeMap` from an iterator over pairs. If any ranges overlap, they must map to
/// the same value.
///
/// # Panics
/// Panics if there are ranges that overlap and do not map to the same value. If you are not
/// sure whether this could happen, use [`RangeMap::try_from_iter`] instead.
fn from_iter<I: IntoIterator<Item = (Range<T>, V)>>(iter: I) -> Self {
RangeMap::try_from_iter(iter).ok().unwrap()
}
}
impl<T: Debug + PrimInt, V: Clone + Debug + Eq> RangeMap<T, V> {
/// Creates a new empty `RangeMap`.
pub fn new() -> RangeMap<T, V> {
RangeMap { elts: Vec::new() }
}
/// Builds a `RangeMap` from an iterator over pairs. If any ranges overlap, they should map to
/// the same value. If not, returns an [`OverlapError`].
pub fn try_from_iter<I: IntoIterator<Item = (Range<T>, V)>>(
iter: I,
) -> Result<RangeMap<T, V>, OverlapError<T, V>> {
let mut vec: Vec<_> = iter.into_iter().collect();
vec.sort_by(|x, y| x.0.cmp(&y.0));
let mut ret = RangeMap { elts: vec };
let discarded = ret.normalize();
if discarded.is_empty() {
Ok(ret)
} else {
Err(OverlapError {
non_overlapping: ret,
discarded: discarded,
})
}
}
// Creates a `RangeMap` from a `Vec`, which must contain ranges in ascending order. If any
// ranges overlap, they must map to the same value.
//
// Panics if the ranges are not sorted, or if they overlap without mapping to the same value.
fn from_sorted_vec(vec: Vec<(Range<T>, V)>) -> RangeMap<T, V> {
let mut ret = RangeMap { elts: vec };
ret.normalize();
ret
}
// Creates a RangeMap from a Vec, which must be sorted and normalized.
//
// Panics unless `vec` is sorted and normalized.
fn from_norm_vec(vec: Vec<(Range<T>, V)>) -> RangeMap<T, V> {
for i in 1..vec.len() {
if vec[i].0.start <= vec[i - 1].0.end {
panic!(
"vector {:?} has overlapping ranges {:?} and {:?}",
vec,
vec[i - 1],
vec[i]
);
}
// If vec[i-1].0.end is T::max_value() then we've already panicked, so the unwrap is
// safe.
if vec[i].0.start == vec[i - 1].0.end.checked_add(&T::one()).unwrap()
&& vec[i].1 == vec[i - 1].1
{
panic!(
"vector {:?} has adjacent ranges with same value {:?} and {:?}",
vec,
vec[i - 1],
vec[i]
);
}
}
RangeMap { elts: vec }
}
/// Returns the number of mapped ranges.
///
/// Note that this is not usually the same as the number of mapped values.
pub fn num_ranges(&self) -> usize {
self.elts.len()
}
/// Tests whether this map is empty.
pub fn is_empty(&self) -> bool {
self.elts.is_empty()
}
/// Tests whether this `CharMap` maps every value.
pub fn is_full(&self) -> bool {
let mut last_end = T::min_value();
for &(range, _) in &self.elts {
if range.start > last_end {
return false;
}
last_end = range.end;
}
last_end == T::max_value()
}
/// Iterates over all the mapped ranges and values.
pub fn ranges_values<'a>(&'a self) -> std::slice::Iter<'a, (Range<T>, V)> {
self.elts.iter()
}
/// Iterates over all mappings.
pub fn keys_values<'a>(&'a self) -> PairIter<'a, T, V> {
PairIter {
map: self,
next_range_idx: if self.is_empty() { None } else { Some(0) },
next_key: if self.is_empty() {
T::min_value()
} else {
self.elts[0].0.start
},
}
}
/// Finds the value that `x` maps to, if it exists.
///
/// Runs in `O(log n)` time, where `n` is the number of mapped ranges.
pub fn get(&self, x: T) -> Option<&V> {
self.elts
// The unwrap is ok because Range<T>::partial_cmp(&T) never returns None.
.binary_search_by(|r| r.0.partial_cmp(&x).unwrap())
.ok()
.map(|idx| &self.elts[idx].1)
}
// Minimizes the number of ranges in this map.
//
// If there are any overlapping ranges that map to the same data, merges them. Assumes that the
// ranges are sorted according to their start.
//
// If there are overlapping ranges that map to different values, we delete them. The return
// value is the collection of all ranges that were deleted.
//
// TODO: because the output is always smaller than the input, this could be done in-place.
fn normalize(&mut self) -> Vec<(Range<T>, V)> {
let mut vec = Vec::with_capacity(self.elts.len());
let mut discarded = Vec::new();
mem::swap(&mut vec, &mut self.elts);
for (range, val) in vec.into_iter() {
if let Some(&mut (ref mut last_range, ref last_val)) = self.elts.last_mut() {
if range.start <= last_range.end && &val != last_val {
discarded.push((range, val));
continue;
}
if range.start <= last_range.end.saturating_add(T::one()) && &val == last_val {
last_range.end = max(range.end, last_range.end);
continue;
}
}
self.elts.push((range, val));
}
discarded
}
/// Returns those mappings whose keys belong to the given set.
pub fn intersection(&self, other: &RangeSet<T>) -> RangeMap<T, V> {
let mut ret = Vec::new();
let mut other_iter = other.map.elts.iter().peekable();
for &(ref r, ref data) in &self.elts {
while let Some(&&(ref s, _)) = other_iter.peek() {
if let Some(int) = s.intersection(r) {
ret.push((int, data.clone()));
}
if s.end >= r.end {
break;
} else {
other_iter.next();
}
}
}
RangeMap::from_sorted_vec(ret)
}
/// Counts the number of mapped keys.
///
/// This saturates at `usize::MAX`.
pub fn num_keys(&self) -> usize {
self.ranges_values().fold(0, |acc, range| {
acc.saturating_add(
(range.0.end - range.0.start)
.to_usize()
.unwrap_or(usize::MAX),
)
.saturating_add(1)
})
}
/// Returns the set of mapped chars, forgetting what they are mapped to.
pub fn to_range_set(&self) -> RangeSet<T> {
RangeSet::from_sorted_vec(self.elts.iter().map(|x| (x.0, ())).collect())
}
/// Modifies the values in place.
pub fn map_values<F>(&mut self, mut f: F)
where
F: FnMut(&V) -> V,
{
for &mut (_, ref mut data) in &mut self.elts {
*data = f(data);
}
// We need to re-normalize, because we might have mapped two adjacent ranges to the same
// value.
self.normalize();
}
/// Modifies this map to contain only those mappings with values `v` satisfying `f(v)`.
pub fn retain_values<F>(&mut self, mut f: F)
where
F: FnMut(&V) -> bool,
{
self.elts.retain(|x| f(&x.1));
}
/// Returns a mutable view into this map.
///
/// The ranges should not be modified, since that might violate our invariants.
///
/// This method will eventually be removed, probably once anonymous return values allow is to
/// write a values_mut() iterator more easily.
pub fn as_mut_slice(&mut self) -> &mut [(Range<T>, V)] {
&mut self.elts
}
}
#[derive(Copy, Clone, Debug)]
pub struct PairIter<'a, T: 'a, V: 'a> {
map: &'a RangeMap<T, V>,
next_range_idx: Option<usize>,
next_key: T,
}
impl<'a, T: PrimInt, V> Iterator for PairIter<'a, T, V> {
type Item = (T, &'a V);
fn next(&mut self) -> Option<Self::Item> {
if let Some(idx) = self.next_range_idx {
let ret = (self.next_key, &self.map.elts[idx].1);
if self.next_key < self.map.elts[idx].0.end {
self.next_key = self.next_key + T::one();
} else if idx < self.map.elts.len() - 1 {
self.next_range_idx = Some(idx + 1);
self.next_key = self.map.elts[idx + 1].0.start;
} else {
self.next_range_idx = None;
}
Some(ret)
} else {
None
}
}
}
/// A set of integers, implemented as a sorted list of (inclusive) ranges.
#[derive(Clone, Eq, Hash, PartialEq)]
pub struct RangeSet<T> {
map: RangeMap<T, ()>,
}
#[derive(Clone, Debug, Eq, Hash, PartialEq)]
pub struct RangeIter<'a, T: PrimInt + 'a> {
set: &'a RangeSet<T>,
next_idx: usize,
}
impl<'a, T: Debug + PrimInt> Iterator for RangeIter<'a, T> {
type Item = Range<T>;
fn next(&mut self) -> Option<Range<T>> {
if self.next_idx < self.set.num_ranges() {
let ret = Some(self.set.map.elts[self.next_idx].0);
self.next_idx += 1;
ret
} else {
None
}
}
}
#[derive(Copy, Clone, Debug)]
pub struct EltIter<'a, T: 'a + PrimInt> {
set: &'a RangeSet<T>,
next_range_idx: Option<usize>,
next_elt: T,
}
impl<'a, T: Debug + PrimInt> Iterator for EltIter<'a, T> {
type Item = T;
fn next(&mut self) -> Option<T> {
if let Some(idx) = self.next_range_idx {
let ret = Some(self.next_elt);
if self.next_elt >= self.set.map.elts[idx].0.end {
if idx + 1 < self.set.num_ranges() {
self.next_range_idx = Some(idx + 1);
self.next_elt = self.set.map.elts[idx + 1].0.start;
} else {
self.next_range_idx = None;
}
} else {
self.next_elt = self.next_elt + T::one();
}
ret
} else {
None
}
}
}
impl<T: Debug + PrimInt> Debug for RangeSet<T> {
// When alternate formatting is specified, only prints out the first buch of mappings.
fn fmt(&self, f: &mut Formatter) -> Result<(), std::fmt::Error> {
try!(f.write_fmt(format_args!("RangeSet (")));
if f.alternate() {
try!(f
.debug_set()
.entries(self.ranges().take(DISPLAY_LIMIT))
.finish());
if self.num_ranges() > DISPLAY_LIMIT {
try!(f.write_str("..."));
}
} else {
try!(f.debug_set().entries(self.ranges()).finish());
}
try!(f.write_str(")"));
Ok(())
}
}
impl<T: Debug + PrimInt> FromIterator<Range<T>> for RangeSet<T> {
/// Builds a `RangeSet` from an iterator over `Range`s.
fn from_iter<I: IntoIterator<Item = Range<T>>>(iter: I) -> Self {
RangeSet {
// The unwrap here is ok because RangeMap::try_from_iter only fails when two
// overlapping ranges map to different values. Since every range here maps to the same
// value, (i.e. ()), this will never happen.
map: RangeMap::try_from_iter(iter.into_iter().map(|x| (x, ())))
.ok()
.unwrap(),
}
}
}
impl<T: Debug + PrimInt> RangeSet<T> {
/// Creates a new empty `RangeSet`.
pub fn new() -> RangeSet<T> {
RangeSet {
map: RangeMap::new(),
}
}
/// Tests if this set is empty.
pub fn is_empty(&self) -> bool {
self.map.is_empty()
}
/// Tests whether this set contains every valid value of `T`.
pub fn is_full(&self) -> bool {
// We are assuming normalization here.
self.num_ranges() == 1 && self.map.elts[0].0 == Range::full()
}
/// Returns the number of ranges used to represent this set.
pub fn num_ranges(&self) -> usize {
self.map.num_ranges()
}
/// Returns the number of elements in the set.
///
/// This saturates at `usize::MAX`.
pub fn num_elements(&self) -> usize {
self.map.num_keys()
}
/// Returns an iterator over all ranges in this set.
pub fn ranges<'a>(&'a self) -> RangeIter<'a, T> {
RangeIter {
set: self,
next_idx: 0,
}
}
/// Returns an iterator over all elements in this set.
pub fn elements<'a>(&'a self) -> EltIter<'a, T> {
if self.map.elts.is_empty() {
EltIter {
set: self,
next_range_idx: None,
next_elt: T::min_value(),
}
} else {
EltIter {
set: self,
next_range_idx: Some(0),
next_elt: self.map.elts[0].0.start,
}
}
}
/// Checks if this set contains a value.
pub fn contains(&self, val: T) -> bool {
self.map.get(val).is_some()
}
// Creates a RangeSet from a vector. The vector must be sorted, but it does not need to be
// normalized.
fn from_sorted_vec(vec: Vec<(Range<T>, ())>) -> RangeSet<T> {
RangeSet {
map: RangeMap::from_sorted_vec(vec),
}
}
// Creates a RangeSet from a vector. The vector must be normalized, in the sense that it should
// contain no adjacent ranges.
fn from_norm_vec(vec: Vec<(Range<T>, ())>) -> RangeSet<T> {
RangeSet {
map: RangeMap::from_norm_vec(vec),
}
}
/// Returns the union between `self` and `other`.
pub fn union(&self, other: &RangeSet<T>) -> RangeSet<T> {
if self.is_empty() {
return other.clone();
} else if other.is_empty() {
return self.clone();
}
let mut ret = Vec::with_capacity(self.map.elts.len() + other.map.elts.len());
let mut it1 = self.map.elts.iter();
let mut it2 = other.map.elts.iter();
let mut r1 = it1.next();
let mut r2 = it2.next();
let mut cur_range: Option<Range<T>> = None;
while r1.is_some() || r2.is_some() {
let r1_start = if let Some(&(r, _)) = r1 {
r.start
} else {
T::max_value()
};
let r2_start = if let Some(&(r, _)) = r2 {
r.start
} else {
T::max_value()
};
if let Some(cur) = cur_range {
if min(r1_start, r2_start) > cur.end.saturating_add(T::one()) {
ret.push((cur_range.unwrap(), ()));
cur_range = None;
}
}
let cover = |cur: &mut Option<Range<T>>, next: &Range<T>| {
if let &mut Some(ref mut r) = cur {
*r = r.cover(next);
} else {
*cur = Some(*next);
}
};
if r1_start < r2_start || r2.is_none() {
cover(&mut cur_range, &r1.unwrap().0);
r1 = it1.next();
} else {
cover(&mut cur_range, &r2.unwrap().0);
r2 = it2.next();
}
}
if cur_range.is_some() {
ret.push((cur_range.unwrap(), ()));
}
RangeSet::from_norm_vec(ret)
}
/// Creates a set that contains every value of `T`.
pub fn full() -> RangeSet<T> {
RangeSet::from_norm_vec(vec![(Range::full(), ())])
}
/// Creates a set containing a single element.
pub fn single(x: T) -> RangeSet<T> {
RangeSet::from_norm_vec(vec![(Range::single(x), ())])
}
/// Creates a set containing all elements except the given ones. The input iterator must be
/// sorted. If it is not, this will return `None`.
pub fn except<I: Iterator<Item = T>>(it: I) -> Option<RangeSet<T>> {
let mut ret = Vec::new();
let mut next_allowed = T::min_value();
let mut last_forbidden = T::max_value();
for i in it {
if i > next_allowed {
ret.push((Range::new(next_allowed, i - T::one()), ()));
} else if i < next_allowed.saturating_sub(T::one()) {
return None;
}
last_forbidden = i;
next_allowed = i.saturating_add(T::one());
}
if last_forbidden < T::max_value() {
ret.push((Range::new(last_forbidden + T::one(), T::max_value()), ()));
}
Some(RangeSet::from_norm_vec(ret))
}
/// Finds the intersection between this set and `other`.
pub fn intersection(&self, other: &RangeSet<T>) -> RangeSet<T> {
RangeSet {
map: self.map.intersection(other),
}
}
/// Returns the set of all characters that are not in this set.
pub fn negated(&self) -> RangeSet<T> {
let mut ret = Vec::with_capacity(self.num_ranges() + 1);
let mut last_end = T::min_value();
for range in self.ranges() {
if range.start > last_end {
ret.push((Range::new(last_end, range.start - T::one()), ()));
}
last_end = range.end.saturating_add(T::one());
}
if last_end < T::max_value() {
ret.push((Range::new(last_end, T::max_value()), ()));
}
RangeSet::from_norm_vec(ret)
}
}
/// A multi-valued mapping from primitive integers to other data.
#[derive(Clone, Eq, Hash, PartialEq)]
pub struct RangeMultiMap<T, V> {
elts: Vec<(Range<T>, V)>,
}
impl<T: Debug + PrimInt, V: Clone + Debug + PartialEq> FromIterator<(Range<T>, V)>
for RangeMultiMap<T, V>
{
/// Builds a `RangeMultiMap` from an iterator over `Range` and values..
fn from_iter<I: IntoIterator<Item = (Range<T>, V)>>(iter: I) -> Self {
RangeMultiMap::from_vec(iter.into_iter().collect())
}
}
impl<T: Debug + PrimInt, V: Clone + Debug + PartialEq> Debug for RangeMultiMap<T, V> {
fn fmt(&self, f: &mut Formatter) -> Result<(), std::fmt::Error> {
try!(f.write_fmt(format_args!("RangeMultiMap (")));
if f.alternate() {
try!(f
.debug_map()
.entries(
self.ranges_values()
.map(|x| (&x.0, &x.1))
.take(DISPLAY_LIMIT)
)
.finish());
if self.num_ranges() > DISPLAY_LIMIT {
try!(f.write_str("..."));
}
} else {
try!(f
.debug_set()
.entries(self.ranges_values().map(|x| (&x.0, &x.1)))
.finish());
}
try!(f.write_str(")"));
Ok(())
}
}
impl<T: Debug + PrimInt, V: Clone + Debug + PartialEq> RangeMultiMap<T, V> {
/// Creates a new empty map.
pub fn new() -> RangeMultiMap<T, V> {
RangeMultiMap { elts: Vec::new() }
}
/// Returns the number of mapped ranges.
pub fn num_ranges(&self) -> usize {
self.elts.len()
}
/// Checks if the map is empty.
pub fn is_empty(&self) -> bool {
self.elts.is_empty()
}
/// Adds a new mapping from a range of characters to `value`.
pub fn insert(&mut self, range: Range<T>, value: V) {
self.elts.push((range, value));
}
/// Creates a map from a vector of pairs.
pub fn from_vec(vec: Vec<(Range<T>, V)>) -> RangeMultiMap<T, V> {
RangeMultiMap { elts: vec }
}
/// Returns a new `RangeMultiMap` containing only the mappings for keys that belong to the
/// given set.
pub fn intersection(&self, other: &RangeSet<T>) -> RangeMultiMap<T, V> {
let mut ret = Vec::new();
for &(ref my_range, ref data) in &self.elts {
let start_idx = other
.map
.elts
.binary_search_by(|r| r.0.end.cmp(&my_range.start))
.unwrap_or_else(|x| x);
for &(ref other_range, _) in &other.map.elts[start_idx..] {
if my_range.start > other_range.end {
break;
} else if let Some(r) = my_range.intersection(other_range) {
ret.push((r, data.clone()));
}
}
}
RangeMultiMap::from_vec(ret)
}
pub fn map_values<F>(&mut self, mut f: F)
where
F: FnMut(&V) -> V,
{
for i in 0..self.elts.len() {
self.elts[i].1 = f(&self.elts[i].1);
}
}
/// Modifies this map in place to only contain mappings whose values `v` satisfy `f(v)`.
pub fn retain_values<F>(&mut self, mut f: F)
where
F: FnMut(&V) -> bool,
{
self.elts.retain(|x| f(&x.1));
}
/// Returns the underlying `Vec`.
pub fn into_vec(self) -> Vec<(Range<T>, V)> {
self.elts
}
/// Iterates over all the mapped ranges and values.
pub fn ranges_values<'a>(&'a self) -> std::slice::Iter<'a, (Range<T>, V)> {
self.elts.iter()
}
}
impl<T: Debug + PrimInt, V: Clone + Debug + Ord> RangeMultiMap<T, V> {
/// Makes the ranges sorted and non-overlapping. The data associated with each range will
/// be a `Vec<T>` instead of a single `T`.
pub fn group(&self) -> RangeMap<T, Vec<V>> {
if self.elts.is_empty() {
return RangeMap::new();
}
let mut start_chars = Vec::with_capacity(self.elts.len() * 2);
for &(ref range, _) in self.elts.iter() {
start_chars.push(range.start);
if range.end < T::max_value() {
start_chars.push(range.end + T::one());
}
}
start_chars.sort();
start_chars.dedup();
let mut ret: Vec<(Range<T>, Vec<V>)> = Vec::with_capacity(start_chars.len());
for pair in start_chars.windows(2) {
ret.push((Range::new(pair[0], pair[1] - T::one()), Vec::new()));
}
ret.push((
Range::new(*start_chars.last().unwrap(), T::max_value()),
Vec::new(),
));
for &(range, ref val) in self.elts.iter() {
// The unwrap is OK because start_chars contains range.start for every range in elts.
let mut idx = start_chars.binary_search(&range.start).unwrap();
while idx < start_chars.len() && start_chars[idx] <= range.end {
ret[idx].1.push(val.clone());
idx += 1;
}
}
ret.retain(|x| !x.1.is_empty());
RangeMap::from_sorted_vec(ret)
}
}
#[cfg(test)]
mod tests {
use super::*;
use num_iter::range_inclusive;
use num_traits::PrimInt;
use quickcheck::{quickcheck, Arbitrary, Gen, TestResult};
use std::cmp::{max, min};
use std::fmt::Debug;
use std::i32;
use std::ops::Add;
impl<T: Arbitrary + Debug + PrimInt> Arbitrary for Range<T> {
fn arbitrary<G: Gen>(g: &mut G) -> Self {
let a = T::arbitrary(g);
let b = T::arbitrary(g);
Range::new(min(a, b), max(a, b))
}
}
impl<T> Arbitrary for RangeMultiMap<T, i32>
where
T: Arbitrary + Debug + PrimInt,
{
fn arbitrary<G: Gen>(g: &mut G) -> Self {
RangeMultiMap::from_vec(Vec::arbitrary(g))
}
fn shrink(&self) -> Box<Iterator<Item = Self>> {
Box::new(self.elts.shrink().map(|v| RangeMultiMap::from_vec(v)))
}
}
impl<T> Arbitrary for RangeMap<T, i32>
where
T: Arbitrary + Debug + PrimInt,
{
fn arbitrary<G: Gen>(g: &mut G) -> Self {
let map: RangeMap<T, Vec<_>> = RangeMultiMap::arbitrary(g).group();
// TODO: replace fold with sum once it's stable
map.ranges_values()
.map(|x| (x.0, x.1.iter().fold(0, Add::add)))
.collect()
}
fn shrink(&self) -> Box<Iterator<Item = Self>> {
Box::new(self.elts.shrink().map(|v| RangeMap::from_norm_vec(v)))
}
}
impl<T: Arbitrary + Debug + PrimInt> Arbitrary for RangeSet<T> {
fn arbitrary<G: Gen>(g: &mut G) -> Self {
RangeMap::arbitrary(g).to_range_set()
}
fn shrink(&self) -> Box<Iterator<Item = Self>> {
Box::new(self.map.elts.shrink().map(|v| RangeSet::from_norm_vec(v)))
}
}
#[test]
fn range_intersects_intersection() {
fn prop(r1: Range<i32>, r2: Range<i32>) -> bool {
r1.intersection(&r2).is_some() == r1.intersects(&r2)
}
quickcheck(prop as fn(_, _) -> _);
}
#[test]
fn range_intersection_contains() {
fn prop(r1: Range<i32>, r2: Range<i32>, x: i32) -> TestResult {
if let Some(r) = r1.intersection(&r2) {
TestResult::from_bool(r.contains(x) == (r1.contains(x) && r2.contains(x)))
} else {
TestResult::discard()
}
}
quickcheck(prop as fn(_, _, _) -> _);
}
#[test]
#[should_panic]
fn range_backwards() {
map(vec![(5, 1, 1), (6, 10, 2)]);
}
#[test]
fn range_intersection_cover() {
fn prop(r1: Range<i32>, r2: Range<i32>) -> bool {
r1 == r1.cover(&r2).intersection(&r1).unwrap()
}
quickcheck(prop as fn(_, _) -> _);
}
fn map(vec: Vec<(i32, i32, i32)>) -> RangeMap<i32, i32> {
vec.into_iter()
.map(|(a, b, c)| (Range::new(a, b), c))
.collect()
}
#[test]
fn rangemap_overlapping() {
assert_eq!(map(vec![(1, 5, 1), (2, 10, 1)]), map(vec![(1, 10, 1)]));
assert_eq!(
map(vec![(1, 5, 1), (2, 10, 1), (9, 11, 1)]),
map(vec![(1, 11, 1)])
);
map(vec![(1, 5, 1), (6, 10, 2)]);
}
#[test]
#[should_panic]
fn rangemap_overlapping_nonequal() {
map(vec![(1, 5, 1), (5, 10, 2)]);
}
#[test]
fn rangemap_intersection() {
fn prop(map: RangeMap<i32, i32>, set: RangeSet<i32>) -> bool {
let int = map.intersection(&set);
set.elements().all(|x| map.get(x) == int.get(x))
&& int.keys_values().all(|x| set.contains(x.0))
}
quickcheck(prop as fn(_, _) -> _);
}
#[test]
fn rangemap_num_ranges() {
fn prop(map: RangeMap<i32, i32>) -> bool {
map.num_ranges() == map.ranges_values().count()
}
quickcheck(prop as fn(_) -> _);
}
#[test]
fn rangemap_num_keys() {
fn prop(map: RangeMap<i32, i32>) -> bool {
map.num_keys() == map.keys_values().count()
}
quickcheck(prop as fn(_) -> _);
}
#[test]
fn rangemap_map_values() {
fn prop(map: RangeMap<i32, i32>, x: i32) -> bool {
let f = |y: &i32| (x + *y) % 10;
let new_map = {
let mut new_map = map.clone();
new_map.map_values(&f);
new_map
};
let new_map_norm = {
let mut new_map_norm = new_map.clone();
new_map_norm.normalize();
new_map_norm
};
new_map
.keys_values()
.all(|(k, v)| f(map.get(k).unwrap()) == *v)
&& map
.keys_values()
.all(|(k, v)| *new_map.get(k).unwrap() == f(v))
&& new_map == new_map_norm
}
quickcheck(prop as fn(_, _) -> _);
}
#[test]
fn rangemap_retain_values() {
fn prop(map: RangeMap<i32, i32>, r: Range<i32>) -> bool {
let mut new_map = map.clone();
new_map.retain_values(|v| r.contains(*v));
new_map.keys_values().all(|(_, v)| r.contains(*v))
&& map
.keys_values()
.all(|(k, v)| !r.contains(*v) || new_map.get(k).unwrap() == v)
}
quickcheck(prop as fn(_, _) -> _);
}
#[test]
fn rangeset_contains() {
fn prop(set: RangeSet<i32>) -> bool {
set.elements().all(|e| set.contains(e))
}
quickcheck(prop as fn(_) -> _);
}
#[test]
fn rangeset_num_ranges() {
fn prop(set: RangeSet<i32>) -> bool {
set.num_ranges() == set.ranges().count()
}
quickcheck(prop as fn(_) -> _);
}
#[test]
fn rangeset_num_elements() {
fn prop(set: RangeSet<i32>) -> bool {
set.num_elements() == set.elements().count()
}
quickcheck(prop as fn(_) -> _);
}
#[test]
fn rangeset_union() {
fn prop(s1: RangeSet<i32>, s2: RangeSet<i32>) -> bool {
let un = s1.union(&s2);
un.elements().all(|e| s1.contains(e) || s2.contains(e))
&& s1.elements().all(|e| un.contains(e))
&& s2.elements().all(|e| un.contains(e))
}
quickcheck(prop as fn(_, _) -> _);
}
#[test]
fn rangeset_intersection() {
fn prop(s1: RangeSet<i32>, s2: RangeSet<i32>) -> bool {
let int = s1.intersection(&s2);
int.elements().all(|e| s1.contains(e) && s2.contains(e))
&& s1.elements().all(|e| int.contains(e) == s2.contains(e))
}
quickcheck(prop as fn(_, _) -> _);
}
#[test]
fn rangeset_negate() {
fn prop(set: RangeSet<i8>) -> bool {
let neg = set.negated();
neg.elements().all(|e| !set.contains(e))
&& set.elements().all(|e| !neg.contains(e))
&& neg.negated() == set
}
quickcheck(prop as fn(_) -> _);
}
#[test]
fn rangeset_except() {
fn prop(mut except: Vec<i8>) -> bool {
except.sort();
let set = RangeSet::except(except.iter().cloned()).unwrap();
set.elements().all(|e| except.binary_search(&e).is_err())
&& except.iter().all(|&e| !set.contains(e))
}
quickcheck(prop as fn(_) -> _);
}
#[test]
fn rangeset_except_unsorted() {
assert_eq!(None, RangeSet::except([1i32, 3, 2].iter().cloned()));
}
// Check that things don't panic when we have MIN and MAX in the ranges (quickcheck doesn't
// check this properly).
#[test]
fn rangemultimap_boundaries() {
assert_eq!(
RangeMultiMap::from_vec(vec![
(Range::new(i32::MIN, 200), 5),
(Range::new(100, i32::MAX), 10),
])
.group(),
RangeMap::from_sorted_vec(vec![
(Range::new(i32::MIN, 99), vec![5]),
(Range::new(100, 200), vec![5, 10]),
(Range::new(201, i32::MAX), vec![10]),
])
);
}
#[test]
fn rangemultimap_group() {
fn prop(mm_vec: Vec<(Range<i32>, i32)>) -> bool {
let mm = RangeMultiMap::from_vec(mm_vec.clone());
let grouped = mm.group();
mm_vec.into_iter().all(|(range, val)| {
range_inclusive(range.start, range.end)
.all(|i| grouped.get(i).unwrap().contains(&val))
})
}
quickcheck(prop as fn(_) -> _);
}
}