zen_expression/variable/
de.rs

1use crate::variable::Variable;
2use ahash::{HashMap, HashMapExt};
3use rust_decimal::prelude::FromPrimitive;
4use rust_decimal::Decimal;
5use serde::de::{DeserializeSeed, Error, MapAccess, SeqAccess, Unexpected, Visitor};
6use serde::{Deserialize, Deserializer};
7use std::fmt::Formatter;
8use std::marker::PhantomData;
9use std::rc::Rc;
10
11struct VariableVisitor;
12
13pub(super) const NUMBER_TOKEN: &str = "$serde_json::private::Number";
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        while let Some((key, value)) = map.next_entry_seed(PhantomData, VariableDeserializer)? {
89            if first && key == NUMBER_TOKEN {
90                return Ok(Variable::Number(
91                    Decimal::from_str_exact(
92                        value
93                            .as_str()
94                            .ok_or_else(|| Error::custom("failed to deserialize number"))?,
95                    )
96                    .map_err(|_| Error::custom("invalid number"))?,
97                ));
98            }
99
100            m.insert(key, value);
101            first = false;
102        }
103
104        Ok(Variable::from_object(m))
105    }
106}
107
108pub struct VariableDeserializer;
109
110impl<'de> DeserializeSeed<'de> for VariableDeserializer {
111    type Value = Variable;
112
113    fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
114    where
115        D: Deserializer<'de>,
116    {
117        deserializer.deserialize_any(VariableVisitor)
118    }
119}
120
121impl<'de> Deserialize<'de> for Variable {
122    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
123    where
124        D: Deserializer<'de>,
125    {
126        deserializer.deserialize_any(VariableVisitor)
127    }
128}
zen_expression/variable/de.rs

zen_expression/variable/
de.rs
