oni_comb_parser_rs/utils/
set.rs

1use std::cmp::{PartialEq, PartialOrd};
2use std::ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo, RangeToInclusive};
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
32// ..
33impl<T> Set<T> for RangeFull {
34  fn contains(&self, _: &T) -> bool {
35    true
36  }
37
38  fn to_str(&self) -> &str {
39    ".."
40  }
41}
42
43//  start..end
44impl<T: PartialOrd + Copy> Set<T> for Range<T> {
45  fn contains(&self, elem: &T) -> bool {
46    self.start <= *elem && self.end > *elem
47  }
48}
49
50// start..=end
51impl<T: PartialOrd + Copy> Set<T> for RangeInclusive<T> {
52  fn contains(&self, elem: &T) -> bool {
53    self.start() <= elem && self.end() >= elem
54  }
55}
56
57// start..
58impl<T: PartialOrd + Copy> Set<T> for RangeFrom<T> {
59  fn contains(&self, elem: &T) -> bool {
60    self.start <= *elem
61  }
62}
63
64// ..end
65impl<T: PartialOrd + Copy> Set<T> for RangeTo<T> {
66  fn contains(&self, elem: &T) -> bool {
67    self.end > *elem
68  }
69}
70
71// ..=end
72impl<T: PartialOrd + Copy> Set<T> for RangeToInclusive<T> {
73  fn contains(&self, elem: &T) -> bool {
74    self.end >= *elem
75  }
76}
77
78macro_rules! impl_set_for_array {
79	( $($n:expr),+ ) => {
80		$(
81			impl Set<u8> for [u8; $n] {
82				fn contains(&self, elem: &u8) -> bool {
83					(self as &[u8]).contains(elem)
84				}
85
86				fn to_str(&self) -> &str {
87					str::from_utf8(self).unwrap_or("<byte array>")
88				}
89			}
90		)+
91	};
92}
93
94impl_set_for_array!(
95  0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
96  32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60,
97  61, 62, 63, 64
98);
oni_comb_parser_rs/utils/set.rs

oni_comb_parser_rs/utils/
set.rs
