de-regex 0.1.0

Regular expression based deserialization for serde
Documentation 
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

use std::str::FromStr;

use serde::de::{Visitor, IntoDeserializer};
use serde::de::value::MapDeserializer;

use regex::Regex;

use crate::error::*;

pub(crate) struct Deserializer<'de> {
    input: &'de str,
    regex: Regex,
}

impl<'de> Deserializer<'de> {
    pub fn new(input: &'de str, regex: Regex) -> Deserializer {
        Deserializer {
            input,
            regex,
        }
    }
}

impl<'de, 'a> serde::Deserializer<'de> for &'a mut Deserializer<'de> {
    type Error = Error;

    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value> where V: Visitor<'de> {
        self.deserialize_map(visitor)
    }

    fn deserialize_map<V>(self, visitor: V) -> Result<V::Value> where V: Visitor<'de> {
        let caps = self.regex.captures(&self.input).ok_or_else(Error::NoMatch)?;

        let items = self.regex.capture_names().filter_map(|n| {
            n.map(|name| {
                let value = &caps[name];
                (name.to_owned(), Value { name: name.to_owned(), value: value.to_owned() })
            })
        });

        let ms = MapDeserializer::new(items);

        visitor.visit_map(ms)
    }

    serde::forward_to_deserialize_any! {
        bool
        u8 u16 u32 u64
        i8 i16 i32 i64
        f32 f64
        char str string identifier
        unit seq bytes byte_buf unit_struct tuple_struct
        tuple ignored_any option newtype_struct enum struct
    }
}


struct Value {
    name: String,
    value: String,
}

impl Value {
    fn parse<T>(&self) -> Result<T> where T: FromStr {
        self.value.parse().map_err(|_| self.get_parse_error())
    }

    fn get_parse_error(&self) -> Error {
        Error::BadValue {
            name: self.name.clone(),
            value: self.value.clone(),
        }
    }
}

impl<'de> IntoDeserializer<'de, Error> for Value {
    type Deserializer = Self;

    fn into_deserializer(self) -> Self::Deserializer {
        self
    }
}

impl<'de> serde::Deserializer<'de> for Value {
    type Error = Error;

    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value> where V: Visitor<'de> {
        self.value.into_deserializer().deserialize_any(visitor)
    }

    fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value> where V: Visitor<'de> {
        if self.value.eq_ignore_ascii_case("true") {
            visitor.visit_bool(true)
        } else if self.value.eq_ignore_ascii_case("false") {
            visitor.visit_bool(false)
        } else {
            Err(self.get_parse_error())
        }
    }

    fn deserialize_i8<V>(self, visitor: V) -> Result<V::Value> where V: Visitor<'de> {
        visitor.visit_i8(self.parse()?)
    }

    fn deserialize_i16<V>(self, visitor: V) -> Result<V::Value> where V: Visitor<'de> {
        visitor.visit_i16(self.parse()?)
    }

    fn deserialize_i32<V>(self, visitor: V) -> Result<V::Value> where V: Visitor<'de> {
        visitor.visit_i32(self.parse()?)
    }

    fn deserialize_i64<V>(self, visitor: V) -> Result<V::Value> where V: Visitor<'de> {
        visitor.visit_i64(self.parse()?)
    }

    fn deserialize_u8<V>(self, visitor: V) -> Result<V::Value> where V: Visitor<'de> {
        visitor.visit_u8(self.parse()?)
    }

    fn deserialize_u16<V>(self, visitor: V) -> Result<V::Value> where V: Visitor<'de> {
        visitor.visit_u16(self.parse()?)
    }

    fn deserialize_u32<V>(self, visitor: V) -> Result<V::Value> where V: Visitor<'de> {
        visitor.visit_u32(self.parse()?)
    }

    fn deserialize_u64<V>(self, visitor: V) -> Result<V::Value> where V: Visitor<'de> {
        visitor.visit_u64(self.parse()?)
    }

    fn deserialize_f32<V>(self, visitor: V) -> Result<V::Value> where V: Visitor<'de> {
        visitor.visit_f32(self.parse()?)
    }

    fn deserialize_f64<V>(self, visitor: V) -> Result<V::Value> where V: Visitor<'de> {
        visitor.visit_f64(self.parse()?)
    }

    fn deserialize_option<V>(self, visitor: V) -> Result<V::Value> where V: Visitor<'de> {
        if self.value.is_empty() {
            visitor.visit_none()
        } else {
            visitor.visit_some(self)
        }
    }

    fn deserialize_newtype_struct<V>(self, _: &'static str, visitor: V) -> Result<V::Value> where V: Visitor<'de> {
        visitor.visit_newtype_struct(self)
    }

    fn deserialize_enum<V>(self, _name: &'static str, _variants: &'static [&'static str], visitor: V) -> Result<V::Value> where V: Visitor<'de> {
        visitor.visit_enum(self.value.into_deserializer())
    }

    //Remaining values can either be parsed as string or are not directly supported
    serde::forward_to_deserialize_any! {
        char str string identifier
        unit seq bytes byte_buf map unit_struct
        tuple_struct tuple ignored_any struct
    }
}