typed-fields 0.6.1

A collection of macros that generate newtypes
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

use proc_macro::TokenStream;

use quote::quote;
use syn::{Ident, parse_macro_input};

use crate::Input;

pub fn url_impl(input: TokenStream) -> TokenStream {
    let Input { attrs, ident } = parse_macro_input!(input as Input);
    let derives = derives();
    let sea_orm_trait_impls = sea_orm_trait_impls(&ident);

    let newtype = quote! {
        #(#attrs)*
        #derives
        pub struct #ident(url::Url);

         impl #ident {
            /// Create a new `#ident`
            ///
            /// This method creates a new `#ident` from a `URL`.
            ///
            /// # Example
            ///
            /// ```
            /// use typed_fields::url;
            /// use url::Url;
            ///
            /// url!(MyUrl);
            ///
            /// let url = MyUrl::new(Url::parse("https://example.com").unwrap());
            /// ```
            pub fn new(url: url::Url) -> Self {
                Self(url)
            }

            /// Get the inner value of the `#ident`
            ///
            /// This method returns a reference to the inner value of the
            /// `#ident`.
            pub fn get(&self) -> &url::Url {
                &self.0
            }
        }

        impl std::fmt::Display for #ident {
            fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
                write!(f, "{}", self.0)
            }
        }

        impl From<url::Url> for #ident {
            fn from(url: url::Url) -> Self {
                Self(url)
            }
        }

        impl TryFrom<&str> for #ident {
            type Error = url::ParseError;

            fn try_from(string: &str) -> Result<Self, Self::Error> {
                Ok(Self(url::Url::try_from(string)?))
            }
        }

        impl TryFrom<String> for #ident {
            type Error = url::ParseError;

            fn try_from(string: String) -> Result<Self, Self::Error> {
                Self::try_from(string.as_str())
            }
        }

        #sea_orm_trait_impls
    };

    newtype.into()
}

fn derives() -> proc_macro2::TokenStream {
    let mut derives = quote! {
        #[derive(Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug)]
    };

    derives.extend(derive_serde());

    derives
}

#[cfg(feature = "sea-orm")]
fn sea_orm_trait_impls(ident: &Ident) -> proc_macro2::TokenStream {
    quote! {
        impl From<#ident> for sea_orm::Value {
            fn from(source: #ident) -> Self {
                let string = source.get().to_string();
                string.into()
            }
        }

        impl sea_orm::TryGetable for #ident {
            fn try_get_by<I: sea_orm::ColIdx>(result: &sea_orm::QueryResult, index: I) -> Result<Self, sea_orm::TryGetError> {
                let string = <String as sea_orm::TryGetable>::try_get_by(result, index)?;
                let parsed = url::Url::parse(&string)
                    .map_err(|err| sea_orm::TryGetError::DbErr(sea_orm::DbErr::Type(format!("{err:?}"))))?;
                Ok(#ident(parsed))
            }
        }

        impl sea_orm::sea_query::ValueType for #ident {
            fn try_from(value: sea_orm::Value) -> Result<Self, sea_orm::sea_query::ValueTypeErr> {
                let string = <String as sea_orm::sea_query::ValueType>::try_from(value)?;
                let parsed = url::Url::parse(&string).map_err(|_| sea_orm::sea_query::ValueTypeErr)?;
                Ok(#ident(parsed))
            }

            fn type_name() -> String {
                stringify!(#ident).to_owned()
            }

            fn array_type() -> sea_orm::sea_query::ArrayType {
                sea_orm::sea_query::ArrayType::String
            }

            fn column_type() -> sea_orm::sea_query::ColumnType {
                sea_orm::sea_query::ColumnType::String(sea_orm::sea_query::StringLen::None)
            }
        }

        impl sea_orm::sea_query::Nullable for #ident {
            fn null() -> sea_orm::Value {
                <String as sea_orm::sea_query::Nullable>::null()
            }
        }
    }
}

#[cfg(not(feature = "sea-orm"))]
fn sea_orm_trait_impls(_ident: &Ident) -> proc_macro2::TokenStream {
    quote! {}
}

#[cfg(feature = "serde")]
fn derive_serde() -> proc_macro2::TokenStream {
    quote! {
        #[derive(serde::Deserialize, serde::Serialize)]
    }
}

#[cfg(not(feature = "serde"))]
fn derive_serde() -> proc_macro2::TokenStream {
    quote! {}
}