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
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
use std::collections::BTreeMap;
use iso8601::DateTime;
pub mod de;
pub mod ser;
pub use de::Deserializer;
pub use ser::Serializer;
#[derive(Clone, Debug, PartialEq)]
pub enum Value {
/// A 32-bit signed integer (`<i4>` or `<int>`).
Int(i32),
/// A 64-bit signed integer (`<i8>`).
Int64(i64),
/// A boolean value (`<boolean>`, 0 == `false`, 1 == `true`).
Bool(bool),
/// A string (`<string>`).
String(String),
/// A double-precision IEEE 754 floating point number (`<double>`).
Double(f64),
/// An ISO 8601 formatted date/time value (`<dateTime.iso8601>`).
DateTime(DateTime),
/// Base64-encoded binary data (`<base64>`).
Base64(Vec<u8>),
/// A mapping of named values (`<struct>`).
Struct(BTreeMap<String, Value>),
/// A list of arbitrary (heterogeneous) values (`<array>`).
Array(Vec<Value>),
/// The empty (Unit) value (`<nil/>`).
Nil,
}
// Public API definitions
impl Value {
/// Returns an inner struct or array value indexed by `index`.
///
/// Returns `None` if the member doesn't exist or `self` is neither a struct nor an array.
///
/// You can also use Rust's square-bracket indexing syntax to perform this operation if you want
/// a default value instead of an `Option`. Refer to the top-level [examples](#examples) for
/// details.
/*
pub fn get<I: Index>(&self, index: I) -> Option<&Value> {
index.get(self)
}
*/
/// If the `Value` is a normal integer (`Value::Int`), returns associated value. Returns `None`
/// otherwise.
///
/// In particular, `None` is also returned if `self` is a `Value::Int64`. Use [`as_i64`] to
/// handle this case.
///
/// [`as_i64`]: #method.as_i64
pub fn as_i32(&self) -> Option<i32> {
match *self {
Value::Int(i) => Some(i),
_ => None,
}
}
/// If the `Value` is an integer, returns associated value. Returns `None` otherwise.
///
/// This works with both `Value::Int` and `Value::Int64`.
pub fn as_i64(&self) -> Option<i64> {
match *self {
Value::Int(i) => Some(i64::from(i)),
Value::Int64(i) => Some(i),
_ => None,
}
}
/// If the `Value` is a boolean, returns associated value. Returns `None` otherwise.
pub fn as_bool(&self) -> Option<bool> {
match *self {
Value::Bool(b) => Some(b),
_ => None,
}
}
/// If the `Value` is a string, returns associated value. Returns `None` otherwise.
pub fn as_str(&self) -> Option<&str> {
match *self {
Value::String(ref s) => Some(s),
_ => None,
}
}
/// If the `Value` is a floating point number, returns associated value. Returns `None`
/// otherwise.
pub fn as_f64(&self) -> Option<f64> {
match *self {
Value::Double(d) => Some(d),
_ => None,
}
}
/// If the `Value` is a date/time, returns associated value. Returns `None` otherwise.
pub fn as_datetime(&self) -> Option<DateTime> {
match *self {
Value::DateTime(dt) => Some(dt),
_ => None,
}
}
/// If the `Value` is base64 binary data, returns associated value. Returns `None` otherwise.
pub fn as_bytes(&self) -> Option<&[u8]> {
match *self {
Value::Base64(ref data) => Some(data),
_ => None,
}
}
/// If the `Value` is a struct, returns associated map. Returns `None` otherwise.
pub fn as_struct(&self) -> Option<&BTreeMap<String, Value>> {
match *self {
Value::Struct(ref map) => Some(map),
_ => None,
}
}
/// If the `Value` is an array, returns associated slice. Returns `None` otherwise.
pub fn as_array(&self) -> Option<&[Value]> {
match *self {
Value::Array(ref array) => Some(array),
_ => None,
}
}
}
// Conversions into Value
impl From<i32> for Value {
fn from(other: i32) -> Self {
Value::Int(other)
}
}
impl From<i64> for Value {
fn from(other: i64) -> Self {
Value::Int64(other)
}
}
impl From<bool> for Value {
fn from(other: bool) -> Self {
Value::Bool(other)
}
}
impl From<String> for Value {
fn from(other: String) -> Self {
Value::String(other)
}
}
impl From<&str> for Value {
fn from(other: &str) -> Self {
Value::String(other.to_string())
}
}
impl From<f64> for Value {
fn from(other: f64) -> Self {
Value::Double(other)
}
}
impl From<DateTime> for Value {
fn from(other: DateTime) -> Self {
Value::DateTime(other)
}
}
impl From<Vec<Value>> for Value {
fn from(other: Vec<Value>) -> Value {
Value::Array(other)
}
}
impl From<BTreeMap<String, Value>> for Value {
fn from(other: BTreeMap<String, Value>) -> Value {
Value::Struct(other)
}
}
impl From<Vec<u8>> for Value {
fn from(other: Vec<u8>) -> Self {
Value::Base64(other)
}
}
|
