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//! Module containing the types for User Defined Attributes (UDA)
use std::collections::BTreeMap;
use std::result::Result as RResult;
use std::fmt;
use serde::Serialize;
use serde::Serializer;
use serde::Deserialize;
use serde::Deserializer;
use serde::de::Visitor;
use serde::de;
/// The name of a UDA is just a string.
pub type UDAName = String;
/// A UDA can have different value types.
#[derive(Clone, Debug, PartialEq, PartialOrd)]
pub enum UDAValue {
/// UDA is a string
Str(String),
/// UDA is an integer
U64(u64),
/// UDA is a float
F64(f64),
}
impl Serialize for UDAValue {
fn serialize<S>(&self, serializer: S) -> RResult<S::Ok, S::Error>
where
S: Serializer,
{
match self {
&UDAValue::Str(ref s) => s.serialize(serializer),
&UDAValue::U64(s) => s.serialize(serializer),
&UDAValue::F64(s) => s.serialize(serializer),
}
}
}
struct UDAVisitor;
impl<'de> Visitor<'de> for UDAVisitor {
type Value = UDAValue;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("an UDA value like a string, float or int")
}
fn visit_u64<E>(self, value: u64) -> Result<UDAValue, E>
where
E: de::Error,
{
Ok(UDAValue::U64(value))
}
fn visit_f64<E>(self, value: f64) -> Result<UDAValue, E>
where
E: de::Error,
{
Ok(UDAValue::F64(value))
}
fn visit_str<E>(self, value: &str) -> Result<UDAValue, E>
where
E: de::Error,
{
Ok(UDAValue::Str(value.to_owned()))
}
}
impl<'de> Deserialize<'de> for UDAValue {
fn deserialize<D>(deserializer: D) -> RResult<UDAValue, D::Error>
where
D: Deserializer<'de>,
{
deserializer.deserialize_any(UDAVisitor)
}
}
/// The UDA Type is just a BTreeMap<UDAName, UDAValue> in which all fields of a task are saved,
/// which are not part of the taskwarrior standard. (This makes them user defined attributes.)
pub type UDA = BTreeMap<UDAName, UDAValue>;
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