toml_datetime/
ser.rs

1//! Serialization support for [`Datetime`][crate::Datetime]
2
3/// Check if serializing a [`Datetime`][crate::Datetime]
4pub fn is_datetime(name: &'static str) -> bool {
5    crate::datetime::is_datetime(name)
6}
7
8/// See [`DatetimeSerializer`]
9#[derive(Debug)]
10#[non_exhaustive]
11pub enum SerializerError {
12    /// Unsupported datetime format
13    InvalidFormat(crate::DatetimeParseError),
14    /// Unsupported serialization protocol
15    InvalidProtocol,
16}
17
18impl serde_core::ser::Error for SerializerError {
19    fn custom<T>(_msg: T) -> Self
20    where
21        T: core::fmt::Display,
22    {
23        Self::InvalidProtocol
24    }
25}
26
27impl core::fmt::Display for SerializerError {
28    fn fmt(&self, formatter: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
29        match self {
30            Self::InvalidFormat(e) => e.fmt(formatter),
31            Self::InvalidProtocol => "invalid serialization protocol".fmt(formatter),
32        }
33    }
34}
35
36impl core::error::Error for SerializerError {}
37
38/// Serializer / format support for emitting [`Datetime`][crate::Datetime]
39#[derive(Default)]
40pub struct DatetimeSerializer {
41    value: Option<crate::Datetime>,
42}
43
44impl DatetimeSerializer {
45    /// Create a serializer to emit [`Datetime`][crate::Datetime]
46    pub fn new() -> Self {
47        Self { value: None }
48    }
49
50    /// See [`serde_core::ser::SerializeStruct::serialize_field`]
51    pub fn serialize_field<T>(
52        &mut self,
53        key: &'static str,
54        value: &T,
55    ) -> Result<(), SerializerError>
56    where
57        T: serde_core::ser::Serialize + ?Sized,
58    {
59        if key == crate::datetime::FIELD {
60            self.value = Some(value.serialize(DatetimeFieldSerializer::default())?);
61        }
62
63        Ok(())
64    }
65
66    /// See [`serde_core::ser::SerializeStruct::end`]
67    pub fn end(self) -> Result<crate::Datetime, SerializerError> {
68        self.value.ok_or(SerializerError::InvalidProtocol)
69    }
70}
71
72#[derive(Default)]
73struct DatetimeFieldSerializer {}
74
75impl serde_core::ser::Serializer for DatetimeFieldSerializer {
76    type Ok = crate::Datetime;
77    type Error = SerializerError;
78    type SerializeSeq = serde_core::ser::Impossible<Self::Ok, Self::Error>;
79    type SerializeTuple = serde_core::ser::Impossible<Self::Ok, Self::Error>;
80    type SerializeTupleStruct = serde_core::ser::Impossible<Self::Ok, Self::Error>;
81    type SerializeTupleVariant = serde_core::ser::Impossible<Self::Ok, Self::Error>;
82    type SerializeMap = serde_core::ser::Impossible<Self::Ok, Self::Error>;
83    type SerializeStruct = serde_core::ser::Impossible<Self::Ok, Self::Error>;
84    type SerializeStructVariant = serde_core::ser::Impossible<Self::Ok, Self::Error>;
85
86    fn serialize_bool(self, _value: bool) -> Result<Self::Ok, Self::Error> {
87        Err(SerializerError::InvalidProtocol)
88    }
89
90    fn serialize_i8(self, _value: i8) -> Result<Self::Ok, Self::Error> {
91        Err(SerializerError::InvalidProtocol)
92    }
93
94    fn serialize_i16(self, _value: i16) -> Result<Self::Ok, Self::Error> {
95        Err(SerializerError::InvalidProtocol)
96    }
97
98    fn serialize_i32(self, _value: i32) -> Result<Self::Ok, Self::Error> {
99        Err(SerializerError::InvalidProtocol)
100    }
101
102    fn serialize_i64(self, _value: i64) -> Result<Self::Ok, Self::Error> {
103        Err(SerializerError::InvalidProtocol)
104    }
105
106    fn serialize_u8(self, _value: u8) -> Result<Self::Ok, Self::Error> {
107        Err(SerializerError::InvalidProtocol)
108    }
109
110    fn serialize_u16(self, _value: u16) -> Result<Self::Ok, Self::Error> {
111        Err(SerializerError::InvalidProtocol)
112    }
113
114    fn serialize_u32(self, _value: u32) -> Result<Self::Ok, Self::Error> {
115        Err(SerializerError::InvalidProtocol)
116    }
117
118    fn serialize_u64(self, _value: u64) -> Result<Self::Ok, Self::Error> {
119        Err(SerializerError::InvalidProtocol)
120    }
121
122    fn serialize_f32(self, _value: f32) -> Result<Self::Ok, Self::Error> {
123        Err(SerializerError::InvalidProtocol)
124    }
125
126    fn serialize_f64(self, _value: f64) -> Result<Self::Ok, Self::Error> {
127        Err(SerializerError::InvalidProtocol)
128    }
129
130    fn serialize_char(self, _value: char) -> Result<Self::Ok, Self::Error> {
131        Err(SerializerError::InvalidProtocol)
132    }
133
134    fn serialize_str(self, v: &str) -> Result<Self::Ok, Self::Error> {
135        v.parse::<crate::Datetime>()
136            .map_err(SerializerError::InvalidFormat)
137    }
138
139    fn serialize_bytes(self, _value: &[u8]) -> Result<Self::Ok, Self::Error> {
140        Err(SerializerError::InvalidProtocol)
141    }
142
143    fn serialize_none(self) -> Result<Self::Ok, Self::Error> {
144        Err(SerializerError::InvalidProtocol)
145    }
146
147    fn serialize_some<T>(self, _value: &T) -> Result<Self::Ok, Self::Error>
148    where
149        T: serde_core::ser::Serialize + ?Sized,
150    {
151        Err(SerializerError::InvalidProtocol)
152    }
153
154    fn serialize_unit(self) -> Result<Self::Ok, Self::Error> {
155        Err(SerializerError::InvalidProtocol)
156    }
157
158    fn serialize_unit_struct(self, _name: &'static str) -> Result<Self::Ok, Self::Error> {
159        Err(SerializerError::InvalidProtocol)
160    }
161
162    fn serialize_unit_variant(
163        self,
164        _name: &'static str,
165        _variant_index: u32,
166        _variant: &'static str,
167    ) -> Result<Self::Ok, Self::Error> {
168        Err(SerializerError::InvalidProtocol)
169    }
170
171    fn serialize_newtype_struct<T>(
172        self,
173        _name: &'static str,
174        _value: &T,
175    ) -> Result<Self::Ok, Self::Error>
176    where
177        T: serde_core::ser::Serialize + ?Sized,
178    {
179        Err(SerializerError::InvalidProtocol)
180    }
181
182    fn serialize_newtype_variant<T>(
183        self,
184        _name: &'static str,
185        _variant_index: u32,
186        _variant: &'static str,
187        _value: &T,
188    ) -> Result<Self::Ok, Self::Error>
189    where
190        T: serde_core::ser::Serialize + ?Sized,
191    {
192        Err(SerializerError::InvalidProtocol)
193    }
194
195    fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq, Self::Error> {
196        Err(SerializerError::InvalidProtocol)
197    }
198
199    fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple, Self::Error> {
200        Err(SerializerError::InvalidProtocol)
201    }
202
203    fn serialize_tuple_struct(
204        self,
205        _name: &'static str,
206        _len: usize,
207    ) -> Result<Self::SerializeTupleStruct, Self::Error> {
208        Err(SerializerError::InvalidProtocol)
209    }
210
211    fn serialize_tuple_variant(
212        self,
213        _name: &'static str,
214        _variant_index: u32,
215        _variant: &'static str,
216        _len: usize,
217    ) -> Result<Self::SerializeTupleVariant, Self::Error> {
218        Err(SerializerError::InvalidProtocol)
219    }
220
221    fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap, Self::Error> {
222        Err(SerializerError::InvalidProtocol)
223    }
224
225    fn serialize_struct(
226        self,
227        _name: &'static str,
228        _len: usize,
229    ) -> Result<Self::SerializeStruct, Self::Error> {
230        Err(SerializerError::InvalidProtocol)
231    }
232
233    fn serialize_struct_variant(
234        self,
235        _name: &'static str,
236        _variant_index: u32,
237        _variant: &'static str,
238        _len: usize,
239    ) -> Result<Self::SerializeStructVariant, Self::Error> {
240        Err(SerializerError::InvalidProtocol)
241    }
242}
toml_datetime/ser.rs

toml_datetime/
ser.rs
