cynic_codegen/input_object_derive/
input.rs

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
use crate::schema::SchemaInput;

use {darling::util::SpannedValue, syn::spanned::Spanned};

use {
    crate::idents::{RenamableFieldIdent, RenameAll},
    proc_macro2::Span,
};

#[derive(darling::FromDeriveInput)]
#[darling(attributes(cynic), supports(struct_named))]
pub struct InputObjectDeriveInput {
    pub(super) ident: proc_macro2::Ident,
    pub(super) generics: syn::Generics,
    pub(super) data: darling::ast::Data<(), InputObjectDeriveField>,

    #[darling(default)]
    schema: Option<SpannedValue<String>>,
    #[darling(default)]
    schema_path: Option<SpannedValue<String>>,

    #[darling(default, rename = "schema_module")]
    schema_module_: Option<syn::Path>,

    #[darling(default)]
    pub graphql_type: Option<SpannedValue<String>>,

    #[darling(default)]
    pub require_all_fields: bool,

    #[darling(default)]
    pub(super) rename_all: Option<RenameAll>,
}

#[derive(Debug, darling::FromField)]
#[darling(attributes(cynic))]
pub struct InputObjectDeriveField {
    pub(super) ident: Option<proc_macro2::Ident>,
    pub(super) ty: syn::Type,

    #[darling(default)]
    pub(super) skip_serializing_if: Option<SpannedValue<syn::Path>>,

    #[darling(default)]
    pub(super) rename: Option<SpannedValue<String>>,
}

impl InputObjectDeriveInput {
    pub fn schema_module(&self) -> syn::Path {
        if let Some(schema_module) = &self.schema_module_ {
            return schema_module.clone();
        }
        syn::parse2(quote::quote! { schema }).unwrap()
    }

    pub fn graphql_type_name(&self) -> String {
        self.graphql_type
            .as_ref()
            .map(|sp| sp.to_string())
            .unwrap_or_else(|| self.ident.to_string())
    }

    pub fn graphql_type_span(&self) -> Span {
        self.graphql_type
            .as_ref()
            .map(|val| val.span())
            .unwrap_or_else(|| self.ident.span())
    }

    pub fn schema_input(&self) -> Result<SchemaInput, syn::Error> {
        match (&self.schema, &self.schema_path) {
            (None, None) => SchemaInput::default().map_err(|e| e.into_syn_error(Span::call_site())),
            (None, Some(path)) => SchemaInput::from_schema_path(path.as_ref())
                .map_err(|e| e.into_syn_error(path.span())),
            (Some(name), None) => SchemaInput::from_schema_name(name.as_ref())
                .map_err(|e| e.into_syn_error(name.span())),
            (Some(_), Some(path)) => Err(syn::Error::new(
                path.span(),
                "Only one of schema_path & schema can be provided",
            )),
        }
    }
}

impl InputObjectDeriveField {
    pub fn graphql_ident(&self, rename_rule: RenameAll) -> RenamableFieldIdent {
        let mut ident = RenamableFieldIdent::from(
            self.ident
                .clone()
                .expect("InputObject only supports named structs"),
        );
        match &self.rename {
            Some(rename) => {
                let span = rename.span();
                let rename = (**rename).clone();
                ident.set_rename(rename, span)
            }
            None => {
                ident.rename_with(rename_rule, self.ident.span());
            }
        }
        ident
    }
}