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

use json_ld_core::IndexedObject;

pub enum Expanded<T, B, M> {
	Null,
	Object(IndexedObject<T, B, M>),
	Array(Vec<IndexedObject<T, B, M>>),
}

impl<T, B, M> Expanded<T, B, M> {
	pub fn len(&self) -> usize {
		match self {
			Expanded::Null => 0,
			Expanded::Object(_) => 1,
			Expanded::Array(ary) => ary.len(),
		}
	}

	pub fn is_empty(&self) -> bool {
		self.len() == 0
	}

	pub fn is_null(&self) -> bool {
		matches!(self, Expanded::Null)
	}

	pub fn is_list(&self) -> bool {
		match self {
			Expanded::Object(o) => o.is_list(),
			_ => false,
		}
	}

	pub fn iter(&self) -> Iter<T, B, M> {
		match self {
			Expanded::Null => Iter::Null,
			Expanded::Object(ref o) => Iter::Object(Some(o)),
			Expanded::Array(ary) => Iter::Array(ary.iter()),
		}
	}
}

impl<T, B, M> IntoIterator for Expanded<T, B, M> {
	type Item = IndexedObject<T, B, M>;
	type IntoIter = IntoIter<T, B, M>;

	fn into_iter(self) -> IntoIter<T, B, M> {
		match self {
			Expanded::Null => IntoIter::Null,
			Expanded::Object(o) => IntoIter::Object(Some(o)),
			Expanded::Array(ary) => IntoIter::Array(ary.into_iter()),
		}
	}
}

impl<'a, T, B, M> IntoIterator for &'a Expanded<T, B, M> {
	type Item = &'a IndexedObject<T, B, M>;
	type IntoIter = Iter<'a, T, B, M>;

	fn into_iter(self) -> Iter<'a, T, B, M> {
		self.iter()
	}
}

pub enum Iter<'a, T, B, M> {
	Null,
	Object(Option<&'a IndexedObject<T, B, M>>),
	Array(std::slice::Iter<'a, IndexedObject<T, B, M>>),
}

impl<'a, T, B, M> Iterator for Iter<'a, T, B, M> {
	type Item = &'a IndexedObject<T, B, M>;

	fn next(&mut self) -> Option<&'a IndexedObject<T, B, M>> {
		match self {
			Iter::Null => None,
			Iter::Object(ref mut o) => {
				let mut result = None;
				std::mem::swap(o, &mut result);
				result
			}
			Iter::Array(ref mut it) => it.next(),
		}
	}
}

pub enum IntoIter<T, B, M> {
	Null,
	Object(Option<IndexedObject<T, B, M>>),
	Array(std::vec::IntoIter<IndexedObject<T, B, M>>),
}

impl<T, B, M> Iterator for IntoIter<T, B, M> {
	type Item = IndexedObject<T, B, M>;

	fn next(&mut self) -> Option<IndexedObject<T, B, M>> {
		match self {
			IntoIter::Null => None,
			IntoIter::Object(ref mut o) => {
				let mut result = None;
				std::mem::swap(o, &mut result);
				result
			}
			IntoIter::Array(ref mut it) => it.next(),
		}
	}
}

impl<T, B, M> From<IndexedObject<T, B, M>> for Expanded<T, B, M> {
	fn from(obj: IndexedObject<T, B, M>) -> Expanded<T, B, M> {
		Expanded::Object(obj)
	}
}

impl<T, B, M> From<Vec<IndexedObject<T, B, M>>> for Expanded<T, B, M> {
	fn from(list: Vec<IndexedObject<T, B, M>>) -> Expanded<T, B, M> {
		Expanded::Array(list)
	}
}