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
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
use super::Keyword;
use crate::{util::AsJson, BlankId, Reference};
use iref::{AsIri, Iri};
use json::JsonValue;
use std::fmt;
pub trait TermLike {
fn as_iri(&self) -> Option<Iri>;
fn as_str(&self) -> &str;
}
#[derive(Clone, PartialEq, Eq, Hash)]
pub enum Term<T: AsIri> {
Null,
Ref(Reference<T>),
Keyword(Keyword),
}
impl<T: AsIri> Term<T> {
pub fn is_null(&self) -> bool {
matches!(self, Term::Null)
}
pub fn into_id(self) -> Result<T, Self> {
match self {
Term::Ref(Reference::Id(id)) => Ok(id),
term => Err(term),
}
}
pub fn as_str(&self) -> &str {
match self {
Term::Ref(p) => p.as_str(),
Term::Keyword(k) => k.into_str(),
Term::Null => "",
}
}
pub fn is_keyword(&self) -> bool {
matches!(self, Term::Keyword(_))
}
pub fn as_iri(&self) -> Option<Iri> {
match self {
Term::Ref(p) => p.as_iri(),
_ => None,
}
}
}
impl<T: AsIri> TermLike for Term<T> {
fn as_iri(&self) -> Option<Iri> {
self.as_iri()
}
fn as_str(&self) -> &str {
self.as_str()
}
}
impl<'a, T: AsIri> From<&'a Term<T>> for Term<&'a T> {
fn from(t: &'a Term<T>) -> Term<&'a T> {
match t {
Term::Null => Term::Null,
Term::Ref(r) => Term::Ref(r.into()),
Term::Keyword(k) => Term::Keyword(*k),
}
}
}
impl<T: AsIri> From<T> for Term<T> {
fn from(id: T) -> Term<T> {
Term::Ref(Reference::Id(id))
}
}
impl<T: AsIri> From<BlankId> for Term<T> {
fn from(blank: BlankId) -> Term<T> {
Term::Ref(Reference::Blank(blank))
}
}
impl<T: AsIri> From<Reference<T>> for Term<T> {
fn from(prop: Reference<T>) -> Term<T> {
Term::Ref(prop)
}
}
impl<T: AsIri + fmt::Display> fmt::Display for Term<T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
Term::Ref(p) => p.fmt(f),
Term::Keyword(kw) => kw.into_str().fmt(f),
Term::Null => write!(f, "null"),
}
}
}
impl<T: AsIri> fmt::Debug for Term<T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
Term::Ref(p) => write!(f, "Term::Ref({:?})", p),
Term::Keyword(kw) => write!(f, "Term::Keyword({})", kw),
Term::Null => write!(f, "Term::Null"),
}
}
}
impl<T: AsIri> AsJson for Term<T> {
fn as_json(&self) -> JsonValue {
match self {
Term::Ref(p) => p.as_str().into(),
Term::Keyword(kw) => kw.into_str().into(),
Term::Null => JsonValue::Null,
}
}
}