ink_codegen/generator/
event.rs

1// Copyright (C) Use Ink (UK) Ltd.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15use crate::GenerateCode;
16use derive_more::From;
17use proc_macro2::TokenStream as TokenStream2;
18use syn::spanned::Spanned;
19
20/// Generates code for the event item.
21#[derive(From, Copy, Clone)]
22pub struct Event<'a> {
23    /// The storage item to generate code for.
24    item: &'a ir::Event,
25}
26
27impl GenerateCode for Event<'_> {
28    /// Generates ink! event item code.
29    fn generate_code(&self) -> TokenStream2 {
30        let item = self.item.item();
31        let anonymous = self
32            .item
33            .anonymous()
34            .then(|| quote::quote! { #[ink(anonymous)] });
35        let signature_topic = self
36            .item
37            .signature_topic_hex()
38            .map(|hex_s| quote::quote! { #[ink(signature_topic = #hex_s)] });
39        let cfg_attrs = self.item.get_cfg_attrs(item.span());
40
41        quote::quote! (
42            #( #cfg_attrs )*
43            #[cfg_attr(feature = "std", derive(::ink::EventMetadata))]
44            #[derive(::ink::Event)]
45            #[::ink::scale_derive(Encode, Decode)]
46            #anonymous
47            #signature_topic
48            #item
49        )
50    }
51}
ink_codegen/generator/event.rs

ink_codegen/generator/
event.rs
