yengine 0.0.8

Communication library for the Yate Engine external module protocol.
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

use std::collections::VecDeque;

use facet::{Def, Facet, Partial, Type, UserType};

use super::{Error, Result};

struct Deserializer<'de> {
    parts: VecDeque<&'de str>,
}

impl<'de> Deserializer<'de> {
    fn deserialize_tag(&mut self) -> Result<&str> {
        self.parts.pop_front().ok_or(Error::MissingTag)
    }

    fn deserialize_scalar(&mut self, partial: Partial<'static>) -> Result<Partial<'static>> {
        let value = self.parts.pop_front().ok_or(Error::MissingValue)?;

        Ok(partial.parse_from_str(&super::upcode::decode(value)?)?)
    }

    fn deserialize_option(
        &mut self,
        mut partial: Partial<'static>,
        has_default: bool,
    ) -> Result<Partial<'static>> {
        match self.parts.front() {
            Some(&"") => {
                self.parts.pop_front();

                Ok(partial.set_default()?)
            }
            Some(_) => {
                partial = partial.begin_some()?;
                partial = self.deserialize_value(partial, has_default)?;

                Ok(partial.end()?)
            }
            None => Err(Error::MissingValue),
        }
    }

    fn deserialize_map(
        &mut self,
        mut partial: Partial<'static>,
        has_default: bool,
    ) -> Result<Partial<'static>> {
        partial = partial.init_map()?;

        self.parts = self
            .parts
            .drain(..)
            .map(|kv| kv.split_once('=').ok_or(Error::MisformatedMap))
            .collect::<Result<Vec<_>>>()?
            .into_iter()
            .flat_map(|(k, v)| [k, v])
            .collect();

        while self.parts.front().is_some() {
            partial = partial.begin_key()?;
            partial = self.deserialize_value(partial, has_default)?;
            partial = partial.end()?;

            partial = partial.begin_value()?;
            partial = self.deserialize_value(partial, has_default)?;
            partial = partial.end()?;
        }

        Ok(partial)
    }

    fn deserialize_enum(&mut self, partial: Partial<'static>) -> Result<Partial<'static>> {
        let value = self.parts.pop_front().ok_or(Error::MissingValue)?;

        Ok(partial.select_variant_named(value)?)
    }

    fn deserialize_value(
        &mut self,
        mut partial: Partial<'static>,
        has_default: bool,
    ) -> Result<Partial<'static>> {
        if let Some(tag) = partial.shape().type_tag
            && tag != self.deserialize_tag()?
        {
            return Err(Error::MismatchedTag);
        }

        if self.parts.front().is_none() && has_default {
            return Ok(partial.set_default()?);
        }

        match partial.shape().ty {
            Type::User(UserType::Struct(st)) => {
                for (idx, field) in st.fields.iter().enumerate() {
                    partial = partial.begin_nth_field(idx)?;
                    partial =
                        self.deserialize_value(partial, has_default || field.has_default())?;
                    partial = partial.end()?;
                }

                Ok(partial)
            }
            Type::User(UserType::Enum(_)) => self.deserialize_enum(partial),
            _ => match partial.shape().def {
                Def::Scalar => self.deserialize_scalar(partial),
                Def::Option(_) => self.deserialize_option(partial, has_default),
                Def::Map(_) => self.deserialize_map(partial, has_default),

                _ => panic!("unable to deserialize type: {}", partial.shape()),
            },
        }
    }

    fn deserialize<T: facet::Facet<'static>>(mut self, partial: Partial<'static>) -> Result<T> {
        self.deserialize_value(partial, Default::default())?
            .build()?
            .materialize()
            .map_err(Into::into)
    }
}

/// Deserialize an instance of `T` from it's textual representation.
pub fn from_str<T: Facet<'static>>(input: &str) -> Result<T> {
    let partial = Partial::alloc::<T>()?;
    let de = Deserializer {
        parts: input.split(":").collect(),
    };

    de.deserialize(partial)
}