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use proc_macro::TokenStream;
use quote::{quote, quote_spanned};
use syn::{parse, parse_macro_input, Ident, Token, Visibility};
use build_info_common::BuildInfo;
mod init_value;
use init_value::init_value;
struct FunctionSyntax {
definition_crate: Ident,
visibility: Option<Visibility>,
id: Ident,
}
impl parse::Parse for FunctionSyntax {
fn parse(input: parse::ParseStream) -> parse::Result<Self> {
let definition_crate = input.parse::<Ident>()?;
let visibility: Option<Visibility> = input.parse().ok();
input.parse::<Token![fn]>()?;
let id = input.parse::<Ident>()?;
Ok(FunctionSyntax {
definition_crate,
visibility,
id,
})
}
}
pub fn build_info(input: TokenStream, build_info: BuildInfo) -> TokenStream {
let FunctionSyntax {
definition_crate,
visibility,
id,
} = parse_macro_input!(input as FunctionSyntax);
let visibility = visibility.map_or(quote!(), |vis| quote!(#vis));
let mut tokens = proc_macro2::TokenStream::new();
init_value(&build_info, &mut tokens, &definition_crate);
#[allow(clippy::let_and_return)]
let output = quote_spanned! {
proc_macro::Span::mixed_site().into() =>
#visibility fn #id() -> &'static #definition_crate::BuildInfo {
#definition_crate::lazy_static! {
static ref VERSION: #definition_crate::BuildInfo = #tokens;
}
&VERSION
}
};
output.into()
}
