ink_codegen 5.0.0-alpha

data structures and algorithms for generating ink! IR code
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

// Copyright (C) Parity Technologies (UK) Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use crate::GenerateCode;
use derive_more::From;
use proc_macro2::TokenStream as TokenStream2;

/// Generates code for the storage item.
#[derive(From, Copy, Clone)]
pub struct Event<'a> {
    /// The storage item to generate code for.
    item: &'a ir::Event,
}

impl GenerateCode for Event<'_> {
    /// Generates ink! storage item code.
    fn generate_code(&self) -> TokenStream2 {
        let item = self.item.item();
        let anonymous = self
            .item
            .anonymous()
            .then(|| quote::quote! { #[ink(anonymous)] });
        quote::quote! (
            #[cfg_attr(feature = "std", derive(::ink::EventMetadata))]
            #[derive(::ink::Event)]
            #[::ink::scale_derive(Encode, Decode)]
            #anonymous
            #item
        )
    }
}