zen_types/variable/
de.rs

1use crate::constant::NUMBER_TOKEN;
2use crate::variable::Variable;
3use ahash::{HashMap, HashMapExt};
4use rust_decimal::Decimal;
5use rust_decimal::prelude::FromPrimitive;
6use serde::de::{DeserializeSeed, Error, MapAccess, SeqAccess, Unexpected, Visitor};
7use serde::{Deserialize, Deserializer};
8use std::fmt::Formatter;
9use std::marker::PhantomData;
10use std::ops::Deref;
11use std::rc::Rc;
12
13struct VariableVisitor;
14
15impl<'de> Visitor<'de> for VariableVisitor {
16    type Value = Variable;
17
18    fn expecting(&self, formatter: &mut Formatter) -> std::fmt::Result {
19        formatter.write_str("A valid type")
20    }
21
22    fn visit_bool<E>(self, v: bool) -> Result<Self::Value, E>
23    where
24        E: Error,
25    {
26        Ok(Variable::Bool(v))
27    }
28
29    fn visit_i64<E>(self, v: i64) -> Result<Self::Value, E>
30    where
31        E: Error,
32    {
33        Ok(Variable::Number(Decimal::from_i64(v).ok_or_else(|| {
34            Error::invalid_value(Unexpected::Signed(v), &self)
35        })?))
36    }
37
38    fn visit_u64<E>(self, v: u64) -> Result<Self::Value, E>
39    where
40        E: Error,
41    {
42        Ok(Variable::Number(Decimal::from_u64(v).ok_or_else(|| {
43            Error::invalid_value(Unexpected::Unsigned(v), &self)
44        })?))
45    }
46
47    fn visit_f64<E>(self, v: f64) -> Result<Self::Value, E>
48    where
49        E: Error,
50    {
51        Ok(Variable::Number(Decimal::from_f64(v).ok_or_else(|| {
52            Error::invalid_value(Unexpected::Float(v), &self)
53        })?))
54    }
55
56    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
57    where
58        E: Error,
59    {
60        Ok(Variable::String(Rc::from(v)))
61    }
62
63    fn visit_unit<E>(self) -> Result<Self::Value, E>
64    where
65        E: Error,
66    {
67        Ok(Variable::Null)
68    }
69
70    fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
71    where
72        A: SeqAccess<'de>,
73    {
74        let mut vec = Vec::with_capacity(seq.size_hint().unwrap_or_default());
75        while let Some(value) = seq.next_element_seed(VariableDeserializer)? {
76            vec.push(value);
77        }
78
79        Ok(Variable::from_array(vec))
80    }
81
82    fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error>
83    where
84        A: MapAccess<'de>,
85    {
86        let mut m = HashMap::with_capacity(map.size_hint().unwrap_or_default());
87        let mut first = true;
88
89        while let Some((key, value)) =
90            map.next_entry_seed(PhantomData::<Rc<str>>, VariableDeserializer)?
91        {
92            if first && key.deref() == NUMBER_TOKEN {
93                let str = value
94                    .as_str()
95                    .ok_or_else(|| Error::custom("failed to deserialize number"))?;
96
97                return Ok(Variable::Number(
98                    Decimal::from_str_exact(str)
99                        .or_else(|_| Decimal::from_scientific(str))
100                        .map_err(|_| Error::custom("invalid number"))?,
101                ));
102            }
103
104            m.insert(key, value);
105            first = false;
106        }
107
108        Ok(Variable::from_object(m))
109    }
110}
111
112pub struct VariableDeserializer;
113
114impl<'de> DeserializeSeed<'de> for VariableDeserializer {
115    type Value = Variable;
116
117    fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
118    where
119        D: Deserializer<'de>,
120    {
121        deserializer.deserialize_any(VariableVisitor)
122    }
123}
124
125impl<'de> Deserialize<'de> for Variable {
126    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
127    where
128        D: Deserializer<'de>,
129    {
130        deserializer.deserialize_any(VariableVisitor)
131    }
132}
zen_types/variable/de.rs

zen_types/variable/
de.rs
