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

use crate::{dynamic, Result};
use async_graphql::dynamic::ValueAccessor;
use async_graphql::MaybeUndefined;

pub trait FromValue: Sized {
    fn from_value(value: Result<dynamic::ValueAccessor>) -> Result<Self>;
}

impl FromValue for String {
    fn from_value(value: Result<dynamic::ValueAccessor>) -> Result<Self> {
        value?.string().map(|s| s.to_string())
    }
}

impl FromValue for async_graphql::ID {
    fn from_value(value: Result<dynamic::ValueAccessor>) -> Result<Self> {
        value?.string().map(|s| async_graphql::ID(s.to_string()))
    }
}

impl FromValue for bool {
    fn from_value(value: Result<dynamic::ValueAccessor>) -> Result<Self> {
        value?.boolean()
    }
}

impl FromValue for f32 {
    fn from_value(value: Result<dynamic::ValueAccessor>) -> Result<Self> {
        value?.f32()
    }
}

impl FromValue for f64 {
    fn from_value(value: Result<dynamic::ValueAccessor>) -> Result<Self> {
        value?.f64()
    }
}

macro_rules! uint_from_value {
    ($($t:ty),*) => {
        $(
            impl FromValue for $t {
                fn from_value(value: Result<dynamic::ValueAccessor>) -> Result<Self> {
                    value?.u64().map(|v| v as $t)
                }
            }
        )*
    };
}
macro_rules! int_from_value {
    ($($t:ty),*) => {
        $(
            impl FromValue for $t {
                fn from_value(value: Result<dynamic::ValueAccessor>) -> Result<Self> {
                    value?.i64().map(|v| v as $t)
                }
            }
        )*
    };
}

uint_from_value!(u8, u16, u32, u64, usize);
int_from_value!(i8, i16, i32, i64, isize);

impl<T> FromValue for Option<T>
where
    T: FromValue,
{
    fn from_value(value: Result<dynamic::ValueAccessor>) -> Result<Self> {
        match value.ok() {
            None => Ok(None),
            Some(value) if value.is_null() => Ok(None),
            Some(value) => Ok(Some(T::from_value(Ok(value))?)),
        }
    }
}

impl<T> FromValue for MaybeUndefined<T>
where
    T: FromValue,
{
    fn from_value(value: Result<ValueAccessor>) -> Result<Self> {
        match value.ok() {
            None => Ok(MaybeUndefined::Undefined),
            Some(value) if value.is_null() => Ok(MaybeUndefined::Null),
            Some(value) => Ok(MaybeUndefined::Value(T::from_value(Ok(value))?)),
        }
    }
}

impl<T> FromValue for Vec<T>
where
    T: FromValue,
{
    fn from_value(value: Result<dynamic::ValueAccessor>) -> Result<Self> {
        value?
            .list()?
            .iter()
            .map(|v| T::from_value(Ok(v)))
            .collect()
    }
}