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use {
crate::{AccountField, AccountsStruct, Ty},
heck::SnakeCase,
quote::quote,
std::str::FromStr,
};
// Generates the private `__cpi_client_accounts` mod implementation, containing
// a generated struct mapping 1-1 to the `Accounts` struct, except with
// `AccountInfo`s as the types. This is generated for CPI clients.
pub fn generate(
accs: &AccountsStruct,
program_id: proc_macro2::TokenStream,
) -> proc_macro2::TokenStream {
let name = &accs.ident;
let account_mod_name: proc_macro2::TokenStream = format!(
"__cpi_client_accounts_{}",
accs.ident.to_string().to_snake_case()
)
.parse()
.unwrap();
let account_struct_fields: Vec<proc_macro2::TokenStream> = accs
.fields
.iter()
.map(|f: &AccountField| match f {
AccountField::CompositeField(s) => {
let name = &s.ident;
let docs = if let Some(ref docs) = s.docs {
docs.iter()
.map(|docs_line| {
proc_macro2::TokenStream::from_str(&format!(
"#[doc = r#\"{docs_line}\"#]"
))
.unwrap()
})
.collect()
} else {
quote!()
};
let symbol: proc_macro2::TokenStream = format!(
"__cpi_client_accounts_{0}::{1}",
s.symbol.to_snake_case(),
s.symbol,
)
.parse()
.unwrap();
quote! {
#docs
pub #name: #symbol<'info>
}
}
AccountField::Field(f) => {
let name = &f.ident;
let docs = if let Some(ref docs) = f.docs {
docs.iter()
.map(|docs_line| {
proc_macro2::TokenStream::from_str(&format!(
"#[doc = r#\"{docs_line}\"#]"
))
.unwrap()
})
.collect()
} else {
quote!()
};
if f.is_optional {
quote! {
#docs
pub #name: Option<anchor_lang::solana_program::account_info::AccountInfo<'info>>
}
} else {
quote! {
#docs
pub #name: anchor_lang::solana_program::account_info::AccountInfo<'info>
}
}
}
})
.collect();
let account_struct_metas: Vec<proc_macro2::TokenStream> = accs
.fields
.iter()
.map(|f: &AccountField| match f {
AccountField::CompositeField(s) => {
let name = &s.ident;
quote! {
account_metas.extend(self.#name.to_account_metas(None));
}
}
AccountField::Field(f) => {
let is_signer = match f.ty {
Ty::Signer => true,
_ => f.constraints.is_signer(),
};
let is_signer = match is_signer {
false => quote! {false},
true => quote! {true},
};
let meta = match f.constraints.is_mutable() {
false => quote! { anchor_lang::solana_program::instruction::AccountMeta::new_readonly },
true => quote! { anchor_lang::solana_program::instruction::AccountMeta::new },
};
let name = &f.ident;
if f.is_optional {
quote! {
if let Some(#name) = &self.#name {
account_metas.push(#meta(anchor_lang::Key::key(#name), #is_signer));
} else {
account_metas.push(anchor_lang::solana_program::instruction::AccountMeta::new_readonly(#program_id, false));
}
}
} else {
quote! {
account_metas.push(#meta(anchor_lang::Key::key(&self.#name), #is_signer));
}
}
}
})
.collect();
let account_struct_infos: Vec<proc_macro2::TokenStream> = accs
.fields
.iter()
.map(|f: &AccountField| {
let name = &f.ident();
quote! {
account_infos.extend(anchor_lang::ToAccountInfos::to_account_infos(&self.#name));
}
})
.collect();
// Re-export all composite account structs (i.e. other structs deriving
// accounts embedded into this struct. Required because, these embedded
// structs are *not* visible from the #[program] macro, which is responsible
// for generating the `accounts` mod, which aggregates all the generated
// accounts used for structs.
let re_exports: Vec<proc_macro2::TokenStream> = {
// First, dedup the exports.
let mut re_exports = std::collections::HashSet::new();
for f in accs.fields.iter().filter_map(|f: &AccountField| match f {
AccountField::CompositeField(s) => Some(s),
AccountField::Field(_) => None,
}) {
re_exports.insert(format!(
"__cpi_client_accounts_{0}::{1}",
f.symbol.to_snake_case(),
f.symbol,
));
}
re_exports
.iter()
.map(|symbol: &String| {
let symbol: proc_macro2::TokenStream = symbol.parse().unwrap();
quote! {
pub use #symbol;
}
})
.collect()
};
let generics = if account_struct_fields.is_empty() {
quote! {}
} else {
quote! {<'info>}
};
let struct_doc = proc_macro2::TokenStream::from_str(&format!(
"#[doc = \" Generated CPI struct of the accounts for [`{name}`].\"]"
))
.unwrap();
quote! {
/// An internal, Anchor generated module. This is used (as an
/// implementation detail), to generate a CPI struct for a given
/// `#[derive(Accounts)]` implementation, where each field is an
/// AccountInfo.
///
/// To access the struct in this module, one should use the sibling
/// [`cpi::accounts`] module (also generated), which re-exports this.
pub(crate) mod #account_mod_name {
use super::*;
#(#re_exports)*
#struct_doc
pub struct #name #generics {
#(#account_struct_fields),*
}
#[automatically_derived]
impl #generics anchor_lang::ToAccountMetas for #name #generics {
fn to_account_metas(&self, is_signer: Option<bool>) -> Vec<anchor_lang::solana_program::instruction::AccountMeta> {
let mut account_metas = vec![];
#(#account_struct_metas)*
account_metas
}
}
#[automatically_derived]
impl<'info> anchor_lang::ToAccountInfos<'info> for #name #generics {
fn to_account_infos(&self) -> Vec<anchor_lang::solana_program::account_info::AccountInfo<'info>> {
let mut account_infos = vec![];
#(#account_struct_infos)*
account_infos
}
}
}
}
}