rust-analyzer - Unnamed repository; edit this file 'description' to name the repository.


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

//! The IR of the `#[query_group]` macro.

use quote::{ToTokens, format_ident, quote, quote_spanned};
use syn::{Ident, PatType, Path, spanned::Spanned};

use crate::Cycle;

pub(crate) struct TrackedQuery {
    pub(crate) trait_name: Ident,
    pub(crate) signature: syn::Signature,
    pub(crate) pat_and_tys: Vec<PatType>,
    pub(crate) invoke: Option<Path>,
    pub(crate) default: Option<syn::Block>,
    pub(crate) cycle: Option<Cycle>,
    pub(crate) generated_struct: Option<GeneratedInputStruct>,
}

pub(crate) struct GeneratedInputStruct {
    pub(crate) input_struct_name: Ident,
    pub(crate) create_data_ident: Ident,
}

impl ToTokens for TrackedQuery {
    fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
        let sig = &self.signature;
        let trait_name = &self.trait_name;

        let ret = &sig.output;

        let invoke = match &self.invoke {
            Some(path) => path.to_token_stream(),
            None => sig.ident.to_token_stream(),
        };

        let fn_ident = &sig.ident;
        let shim: Ident = format_ident!("{}_shim", fn_ident);

        let options = self
            .cycle
            .as_ref()
            .map(|Cycle { cycle_fn, cycle_initial, cycle_result }| {
                let cycle_fn = cycle_fn.as_ref().map(|(ident, path)| quote!(#ident=#path));
                let cycle_initial =
                    cycle_initial.as_ref().map(|(ident, path)| quote!(#ident=#path));
                let cycle_result = cycle_result.as_ref().map(|(ident, path)| quote!(#ident=#path));
                let options = cycle_fn.into_iter().chain(cycle_initial).chain(cycle_result);
                quote!(#(#options),*)
            })
            .into_iter();
        let annotation = quote!(#[salsa_macros::tracked( #(#options),* )]);

        let pat_and_tys = &self.pat_and_tys;
        let params = self
            .pat_and_tys
            .iter()
            .map(|pat_type| pat_type.pat.clone())
            .collect::<Vec<Box<syn::Pat>>>();

        let invoke_block = match &self.default {
            Some(default) => quote! { #default },
            None => {
                let invoke_params: proc_macro2::TokenStream = quote! {db, #(#params),*};
                quote_spanned! { invoke.span() =>  {#invoke(#invoke_params)}}
            }
        };

        let method = match &self.generated_struct {
            Some(generated_struct) => {
                let input_struct_name = &generated_struct.input_struct_name;
                let create_data_ident = &generated_struct.create_data_ident;

                quote! {
                    #sig {
                        #annotation
                        fn #shim<'db>(
                            db: &'db dyn #trait_name,
                            _input: #input_struct_name,
                            #(#pat_and_tys),*
                        ) #ret
                            #invoke_block
                        #shim(self, #create_data_ident(self), #(#params),*)
                    }
                }
            }
            None => {
                quote! {
                    #sig {
                        #annotation
                        fn #shim<'db>(
                            db: &'db dyn #trait_name,
                            #(#pat_and_tys),*
                        ) #ret
                            #invoke_block

                        #shim(self, #(#params),*)
                    }
                }
            }
        };

        method.to_tokens(tokens);
    }
}

pub(crate) struct Transparent {
    pub(crate) signature: syn::Signature,
    pub(crate) pat_and_tys: Vec<PatType>,
    pub(crate) invoke: Option<Path>,
    pub(crate) default: Option<syn::Block>,
}

impl ToTokens for Transparent {
    fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
        let sig = &self.signature;

        let ty = self
            .pat_and_tys
            .iter()
            .map(|pat_type| pat_type.pat.clone())
            .collect::<Vec<Box<syn::Pat>>>();

        let invoke = match &self.invoke {
            Some(path) => path.to_token_stream(),
            None => sig.ident.to_token_stream(),
        };

        let method = match &self.default {
            Some(default) => quote! {
                #sig { let db = self; #default }
            },
            None => quote! {
                #sig {
                    #invoke(self, #(#ty),*)
                }
            },
        };

        method.to_tokens(tokens);
    }
}

#[allow(clippy::large_enum_variant)]
pub(crate) enum Queries {
    TrackedQuery(TrackedQuery),
    Transparent(Transparent),
}

impl ToTokens for Queries {
    fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
        match self {
            Queries::TrackedQuery(tracked_query) => tracked_query.to_tokens(tokens),
            Queries::Transparent(transparent) => transparent.to_tokens(tokens),
        }
    }
}