fieldmask_derive 0.0.7

derive macros for the fieldmask crate
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

use proc_macro::TokenStream;
use quote::{ToTokens, quote};
use syn::parse_macro_input;

use super::ast::Input;

pub fn maskable_atomic_impl(input: TokenStream) -> TokenStream {
    let Input {
        generics,
        ty,
        update_as_field_fn,
        merge_fn,
        ..
    } = parse_macro_input!(input);

    let (impl_generics, _ty_generics, where_clauses) = generics.split_for_impl();
    let update_as_field_fn = update_as_field_fn
        .map(|item| item.to_token_stream())
        .unwrap_or_else(|| {
            quote! {
                fn update_as_field(
                    &mut self,
                    source: Self,
                    _mask: &<Self as ::fieldmask::Maskable>::Mask,
                    _options: &::fieldmask::UpdateOptions,
                ) {
                    *self = source;
                }
            }
        });
    let merge_fn = merge_fn
        .map(|item| item.to_token_stream())
        .unwrap_or_else(|| {
            quote! {
                fn merge(
                    &mut self,
                    source: Self,
                    _options: &::fieldmask::UpdateOptions,
                ) {
                    if source != ::core::default::Default::default() {
                        *self = source;
                    }
                }
            }
        });

    quote! {
        impl #impl_generics ::fieldmask::Maskable for #ty
        #where_clauses
        {
            type Mask = ();

            fn full_mask() -> Self::Mask {}

            fn make_mask_include_field<'a>(
                _mask: &mut Self::Mask,
                field_path: &[&'a ::core::primitive::str],
            ) -> ::core::result::Result<(), ::fieldmask::DeserializeMaskError<'a>> {
                if field_path.is_empty() {
                    return ::core::result::Result::Ok(());
                }
                ::core::result::Result::Err(::fieldmask::DeserializeMaskError::FieldNotFound {
                    type_name: ::core::stringify!(#ty),
                    field: field_path[0],
                })
            }
        }

        impl #impl_generics ::fieldmask::SelfMaskable for #ty
        #where_clauses
        {
            fn project(self, _mask: &Self::Mask) -> Self {
                self
            }

            #update_as_field_fn
            #merge_fn
        }

        impl #impl_generics ::fieldmask::OptionMaskable for #ty
                #where_clauses
                {
                    fn option_project(
                        this: ::core::option::Option<Self>,
                        _mask: &<Self as ::fieldmask::Maskable>::Mask,
                    ) -> ::core::option::Option<Self> {
                        this
                    }

                    fn option_update_as_field(
                        this: &mut ::core::option::Option<Self>,
                        source: ::core::option::Option<Self>,
                        mask: &<Self as ::fieldmask::Maskable>::Mask,
                        options: &::fieldmask::UpdateOptions,
                    ) {
                        match (this.as_mut(), source) {
                            (::core::option::Option::Some(this), ::core::option::Option::Some(source)) => {
                                ::fieldmask::SelfMaskable::update_as_field(this, source, mask, options);
                            }
                            (::core::option::Option::Some(this), ::core::option::Option::None) => {
                                ::fieldmask::SelfMaskable::update_as_field(
                                    this,
                                    ::core::default::Default::default(),
                                    mask,
                                    options,
                                );
                            }
                            (::core::option::Option::None, source) => {
                                *this = source.map(|s| ::fieldmask::SelfMaskable::project(s, mask));
                            }
                        }
                    }

                    fn option_merge(
                        this: &mut ::core::option::Option<Self>,
                        source: ::core::option::Option<Self>,
                        options: &::fieldmask::UpdateOptions,
                    ) {
                        match (this.as_mut(), source) {
                            (::core::option::Option::Some(this), ::core::option::Option::Some(source)) => {
                                ::fieldmask::SelfMaskable::merge(this, source, options);
                            }
                            (_, ::core::option::Option::None) => {}
                            (::core::option::Option::None, source) => {
                                *this = source;
                            }
                        }
                    }
                }
    }
    .into()
}