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
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
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132

use crate::utils::{self, str_eq};
use static_regular_grammar::RegularGrammar;
use std::hash::Hash;

/// Private use.
#[derive(RegularGrammar)]
#[grammar(
	file = "src/grammar.abnf",
	entry_point = "privateuse",
	cache = "automata/private-use.aut.cbor"
)]
#[grammar(sized(
	PrivateUseBuf,
	derive(Debug, Display, PartialEq, Eq, PartialOrd, Ord, Hash)
))]
#[cfg_attr(feature = "serde", grammar(serde))]
pub struct PrivateUse(str);

impl PrivateUse {
	pub fn iter(&self) -> PrivateUseIter {
		PrivateUseIter::new(&self.0)
	}
}

impl PartialEq for PrivateUse {
	fn eq(&self, other: &Self) -> bool {
		utils::case_insensitive_eq(self.as_bytes(), other.as_bytes())
	}
}

impl Eq for PrivateUse {}

str_eq!(PrivateUse);
str_eq!(PrivateUseBuf);

impl PartialOrd for PrivateUse {
	fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
		Some(self.cmp(other))
	}
}

impl Ord for PrivateUse {
	fn cmp(&self, other: &Self) -> std::cmp::Ordering {
		utils::case_insensitive_cmp(self.as_bytes(), other.as_bytes())
	}
}

impl Hash for PrivateUse {
	fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
		utils::case_insensitive_hash(self.as_bytes(), state)
	}
}

#[derive(Default)]
pub struct PrivateUseIter<'a> {
	data: &'a str,
	offset: usize,
}

impl<'a> PrivateUseIter<'a> {
	fn new(data: &'a str) -> Self {
		Self {
			data,
			offset: 2, // start after the singleton
		}
	}

	pub fn empty() -> Self {
		Self::default()
	}
}

impl<'a> Iterator for PrivateUseIter<'a> {
	type Item = &'a PrivateUseSubtag;

	fn next(&mut self) -> Option<Self::Item> {
		if self.offset < self.data.len() {
			let end = super::find_segment_end(self.data, self.offset);
			let item = unsafe { &PrivateUseSubtag::new_unchecked(&self.data[self.offset..end]) };
			self.offset = end + 1;
			Some(item)
		} else {
			None
		}
	}
}

/// Private use subtag.
///
/// # Grammar
///
/// ```abnf
/// PrivateUseSubtag = 1*8alphanum
///
/// alphanum         = (ALPHA / DIGIT) ; letters and numbers
/// ```
#[derive(RegularGrammar)]
#[grammar(sized(
	PrivateUseSubtagBuf,
	derive(Debug, Display, PartialEq, Eq, PartialOrd, Ord, Hash)
))]
#[cfg_attr(feature = "serde", grammar(serde))]
pub struct PrivateUseSubtag(str);

impl PartialEq for PrivateUseSubtag {
	fn eq(&self, other: &Self) -> bool {
		utils::case_insensitive_eq(self.as_bytes(), other.as_bytes())
	}
}

impl Eq for PrivateUseSubtag {}

str_eq!(PrivateUseSubtag);
str_eq!(PrivateUseSubtagBuf);

impl PartialOrd for PrivateUseSubtag {
	fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
		Some(self.cmp(other))
	}
}

impl Ord for PrivateUseSubtag {
	fn cmp(&self, other: &Self) -> std::cmp::Ordering {
		utils::case_insensitive_cmp(self.as_bytes(), other.as_bytes())
	}
}

impl Hash for PrivateUseSubtag {
	fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
		utils::case_insensitive_hash(self.as_bytes(), state)
	}
}