cynic-codegen 0.14.1

Codegen for cynic - a GraphQL query builder & data mapper for Rust
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

use proc_macro2::TokenStream;

use crate::{schema, Ident};

/// We generate an InterfaceImplementation for each type that implements interface.
///
/// These are output as `HasSubtype` implementations.
#[derive(Debug)]
pub struct InterfacesImplementations {
    pub implementor: Ident,
    pub interfaces: Vec<Ident>,
}

impl InterfacesImplementations {
    pub fn from_interface(iface: &schema::InterfaceType) -> Self {
        let ident = Ident::for_type(&iface.name);

        Self {
            implementor: ident.clone(),
            interfaces: vec![ident],
        }
    }

    pub fn from_object(obj: &schema::ObjectType) -> Option<Self> {
        if obj.implements_interfaces.is_empty() {
            return None;
        }

        Some(Self {
            implementor: Ident::for_type(&obj.name),
            interfaces: obj
                .implements_interfaces
                .iter()
                .map(Ident::for_type)
                .collect(),
        })
    }
}

impl quote::ToTokens for InterfacesImplementations {
    fn to_tokens(&self, tokens: &mut TokenStream) {
        use quote::{quote, TokenStreamExt};

        let implementor = &self.implementor;
        let interfaces = &self.interfaces;

        tokens.append_all(quote! {
            #(
                impl ::cynic::selection_set::HasSubtype<#implementor> for #interfaces {}
            )*
        });
    }
}