gpui-form-derive 0.7.0

Macro crate for gpui-form
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
164
165
166
167
168

use super::storage::{
    HolderStorageStrategy as _, apply_from_conversion, form_base_type, form_field_type_tokens,
};
use super::*;

/// Generates a custom Default implementation for the FormValueHolder that uses
/// the specified default expressions for fields that have them.
pub(super) fn generate_default_impl(
    context: &DeriveContext,
    fields: &[&HolderFieldIr],
    struct_name: &syn::Ident,
    impl_generics: TokenStream,
    ty_generics: TokenStream,
    where_clause: TokenStream,
) -> ValueHolderResult<TokenStream> {
    let default_fields: Vec<TokenStream> = fields
        .iter()
        .map(|f| -> ValueHolderResult<TokenStream> {
            let field_name = f.field_name();
            let base_type = form_base_type(f);
            if let Some(default_expr) = f.default_expr() {
                let default_span = f.default_expr_span();
                let default_original = source_default_tokens(default_expr, default_span);
                let default_value = apply_from_conversion(f, default_original);
                let storage =
                    f.storage()
                        .present_tokens(context, default_value, &base_type, field_name)?;
                Ok(quote! {
                    #field_name: #storage
                })
            } else {
                let storage = f
                    .storage()
                    .default_storage_tokens(context, &base_type, field_name)?;
                Ok(quote! {
                    #field_name: #storage
                })
            }
        })
        .collect::<ValueHolderResult<Vec<_>>>()?;

    Ok(quote! {
        impl #impl_generics ::core::default::Default for #struct_name #ty_generics #where_clause {
            fn default() -> Self {
                Self {
                    #(#default_fields),*
                }
            }
        }
    })
}

fn add_field_trait_bounds(
    context: &DeriveContext,
    mut where_clause: Option<syn::WhereClause>,
    fields: &[&HolderFieldIr],
    trait_path: syn::Path,
) -> ValueHolderResult<Option<syn::WhereClause>> {
    for field in fields {
        let field_type = form_field_type_tokens(context, field)?;
        let wc = where_clause.get_or_insert_with(|| syn::parse_quote!(where));
        wc.predicates
            .push(syn::parse_quote!(#field_type: #trait_path));
    }

    Ok(where_clause)
}

pub(super) fn generate_clone_impl(
    context: &DeriveContext,
    fields: &[&HolderFieldIr],
    struct_name: &syn::Ident,
    impl_generics: TokenStream,
    ty_generics: TokenStream,
    where_clause: Option<syn::WhereClause>,
) -> ValueHolderResult<TokenStream> {
    let clone_fields: Vec<TokenStream> = fields
        .iter()
        .map(|field| {
            let field_name = field.field_name();
            quote! {
                #field_name: self.#field_name.clone()
            }
        })
        .collect();
    let where_clause = add_field_trait_bounds(
        context,
        where_clause,
        fields,
        syn::parse_quote!(::core::clone::Clone),
    )?;

    Ok(quote! {
        impl #impl_generics ::core::clone::Clone for #struct_name #ty_generics #where_clause {
            fn clone(&self) -> Self {
                Self {
                    #(#clone_fields),*
                }
            }
        }
    })
}

pub(super) fn generate_debug_impl(
    context: &DeriveContext,
    fields: &[&HolderFieldIr],
    struct_name: &syn::Ident,
    impl_generics: TokenStream,
    ty_generics: TokenStream,
    where_clause: Option<syn::WhereClause>,
) -> ValueHolderResult<TokenStream> {
    let struct_name_str = struct_name.to_string();
    let debug_fields: Vec<TokenStream> = fields
        .iter()
        .map(|field| {
            let field_name = field.field_name();
            let field_name_str = field_name.to_string();
            quote! {
                .field(#field_name_str, &self.#field_name)
            }
        })
        .collect();
    let where_clause = add_field_trait_bounds(
        context,
        where_clause,
        fields,
        syn::parse_quote!(::core::fmt::Debug),
    )?;

    Ok(quote! {
        impl #impl_generics ::core::fmt::Debug for #struct_name #ty_generics #where_clause {
            fn fmt(&self, f: &mut ::core::fmt::Formatter<'_>) -> ::core::fmt::Result {
                f.debug_struct(#struct_name_str)
                    #(#debug_fields)*
                    .finish()
            }
        }
    })
}

pub(super) fn generate_to_wrapped_field(
    context: &DeriveContext,
    field: &HolderFieldIr,
) -> ValueHolderResult<TokenStream> {
    let field_name = field.field_name();
    let value =
        field
            .storage()
            .source_to_storage_tokens(context, field, quote! { from.#field_name })?;
    Ok(quote! {
        #field_name: #value
    })
}

pub(super) fn generate_from_wrapped_field(
    context: &DeriveContext,
    field: &HolderFieldIr,
) -> ValueHolderResult<TokenStream> {
    let field_name = field.field_name();
    let value = field.storage().storage_to_source_infallible_tokens(
        context,
        field,
        quote! { from.#field_name },
    )?;
    Ok(quote! {
        #field_name: #value
    })
}