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extern crate proc_macro;
use quote::quote;
use syn::parse_macro_input;
#[proc_macro_attribute]
pub fn account(
args: proc_macro::TokenStream,
input: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
let namespace = args.to_string().replace("\"", "");
let account_strct = parse_macro_input!(input as syn::ItemStruct);
let account_name = &account_strct.ident;
let discriminator: proc_macro2::TokenStream = {
let discriminator_preimage = {
if namespace.is_empty() {
format!("account:{}", account_name.to_string())
} else {
format!("{}:{}", namespace, account_name.to_string())
}
};
let mut discriminator = [0u8; 8];
discriminator.copy_from_slice(
&anchor_syn::hash::hash(discriminator_preimage.as_bytes()).to_bytes()[..8],
);
format!("{:?}", discriminator).parse().unwrap()
};
let coder = quote! {
impl anchor_lang::AccountSerialize for #account_name {
fn try_serialize<W: std::io::Write>(&self, writer: &mut W) -> std::result::Result<(), ProgramError> {
writer.write_all(&#discriminator).map_err(|_| ProgramError::InvalidAccountData)?;
AnchorSerialize::serialize(
self,
writer
)
.map_err(|_| ProgramError::InvalidAccountData)?;
Ok(())
}
}
impl anchor_lang::AccountDeserialize for #account_name {
fn try_deserialize(buf: &mut &[u8]) -> std::result::Result<Self, ProgramError> {
if buf.len() < #discriminator.len() {
return Err(ProgramError::AccountDataTooSmall);
}
let given_disc = &buf[..8];
if &#discriminator != given_disc {
return Err(ProgramError::InvalidInstructionData);
}
Self::try_deserialize_unchecked(buf)
}
fn try_deserialize_unchecked(buf: &mut &[u8]) -> std::result::Result<Self, ProgramError> {
let mut data: &[u8] = &buf[8..];
AnchorDeserialize::deserialize(&mut data)
.map_err(|_| ProgramError::InvalidAccountData)
}
}
impl anchor_lang::Discriminator for #account_name {
fn discriminator() -> [u8; 8] {
#discriminator
}
}
};
proc_macro::TokenStream::from(quote! {
#[derive(AnchorSerialize, AnchorDeserialize, Clone)]
#account_strct
#coder
})
}