pom/
set.rs

1use std::cmp::{PartialEq, PartialOrd};
2use std::ops::{Range, RangeFrom, RangeFull, RangeTo};
3use std::str;
4
5/// Set relationship.
6pub trait Set<T> {
7	/// Whether a set contains an element or not.
8	fn contains(&self, elem: &T) -> bool;
9
10	/// Convert to text for display.
11	fn to_str(&self) -> &str {
12		"<set>"
13	}
14}
15
16impl<T: PartialEq> Set<T> for [T] {
17	fn contains(&self, elem: &T) -> bool {
18		(self as &[T]).contains(elem)
19	}
20}
21
22impl Set<char> for str {
23	fn contains(&self, elem: &char) -> bool {
24		(self as &str).contains(*elem)
25	}
26
27	fn to_str(&self) -> &str {
28		self
29	}
30}
31
32impl<T: PartialOrd + Copy> Set<T> for Range<T> {
33	fn contains(&self, elem: &T) -> bool {
34		self.start <= *elem && self.end > *elem
35	}
36}
37
38impl<T: PartialOrd + Copy> Set<T> for RangeFrom<T> {
39	fn contains(&self, elem: &T) -> bool {
40		self.start <= *elem
41	}
42}
43
44impl<T: PartialOrd + Copy> Set<T> for RangeTo<T> {
45	fn contains(&self, elem: &T) -> bool {
46		self.end > *elem
47	}
48}
49
50impl<T> Set<T> for RangeFull {
51	fn contains(&self, _: &T) -> bool {
52		true
53	}
54
55	fn to_str(&self) -> &str {
56		".."
57	}
58}
59
60macro_rules! impl_set_for_array {
61	($n:expr) => {
62		impl Set<u8> for [u8; $n] {
63			fn contains(&self, elem: &u8) -> bool {
64				(self as &[u8]).contains(elem)
65			}
66
67			fn to_str(&self) -> &str {
68				str::from_utf8(self).unwrap_or("<byte array>")
69			}
70		}
71	};
72}
73
74impl_set_for_array!(0);
75impl_set_for_array!(1);
76impl_set_for_array!(2);
77impl_set_for_array!(3);
78impl_set_for_array!(4);
79impl_set_for_array!(5);
80impl_set_for_array!(6);
81impl_set_for_array!(7);
82impl_set_for_array!(8);
83impl_set_for_array!(9);
84impl_set_for_array!(10);
85impl_set_for_array!(11);
86impl_set_for_array!(12);
87impl_set_for_array!(13);
88impl_set_for_array!(14);
89impl_set_for_array!(15);
90impl_set_for_array!(16);
91impl_set_for_array!(17);
92impl_set_for_array!(18);
93impl_set_for_array!(19);
94impl_set_for_array!(20);
95impl_set_for_array!(21);
96impl_set_for_array!(22);
97impl_set_for_array!(23);
98impl_set_for_array!(24);
99impl_set_for_array!(25);
100impl_set_for_array!(26);
101impl_set_for_array!(27);
102impl_set_for_array!(28);
103impl_set_for_array!(29);
104impl_set_for_array!(30);
105impl_set_for_array!(31);
106impl_set_for_array!(32);
pom/set.rs

pom/
set.rs
