anchor_syn/codegen/program/
common.rs

1use {crate::IxArg, anyhow::Result, heck::CamelCase, quote::quote};
2
3// Namespace for calculating instruction sighash signatures for any instruction
4// not affecting program state.
5pub const SIGHASH_GLOBAL_NAMESPACE: &str = "global";
6
7// We don't technically use sighash, because the input arguments aren't given.
8// Rust doesn't have method overloading so no need to use the arguments.
9// However, we do namespace methods in the preeimage so that we can use
10// different traits with the same method name.
11pub fn sighash(namespace: &str, name: &str) -> [u8; 8] {
12    let preimage = format!("{namespace}:{name}");
13
14    let mut sighash = [0u8; 8];
15    sighash.copy_from_slice(&crate::hash::hash(preimage.as_bytes()).to_bytes()[..8]);
16    sighash
17}
18
19pub fn gen_discriminator(namespace: &str, name: impl ToString) -> proc_macro2::TokenStream {
20    let discriminator = sighash(namespace, name.to_string().as_str());
21    format!("&{discriminator:?}").parse().unwrap()
22}
23
24pub fn generate_ix_variant(name: &str, args: &[IxArg]) -> Result<proc_macro2::TokenStream> {
25    let ix_arg_names: Vec<&syn::Ident> = args.iter().map(|arg| &arg.name).collect();
26    let ix_name_camel = generate_ix_variant_name(name)?;
27
28    let variant = if args.is_empty() {
29        quote! {
30            #ix_name_camel
31        }
32    } else {
33        quote! {
34            #ix_name_camel {
35                #(#ix_arg_names),*
36            }
37        }
38    };
39    Ok(variant)
40}
41
42pub fn generate_ix_variant_name(name: &str) -> Result<syn::Ident> {
43    Ok(syn::parse_str(&name.to_camel_case())?)
44}
anchor_syn/codegen/program/common.rs

anchor_syn/codegen/program/
common.rs
