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use proc_macro2::TokenStream;
use quote::{quote, ToTokens};
use syn::parse::{Parse, ParseStream};
use syn::{parse_quote, Result};
use crate::util::{kw, parse_key_value, parse_string};
/// Expand the `#[time(..)]` macro.
pub fn time(stream: TokenStream, item: syn::ItemFn) -> Result<TokenStream> {
let meta: Meta = syn::parse2(stream)?;
Ok(create(meta, item))
}
/// The `..` in `#[time(..)]`.
pub struct Meta {
pub span: Option<syn::Expr>,
pub name: Option<String>,
}
impl Parse for Meta {
fn parse(input: ParseStream) -> Result<Self> {
Ok(Self {
name: parse_string::<kw::name>(input)?,
span: parse_key_value::<kw::span, syn::Expr>(input)?,
})
}
}
fn create(meta: Meta, mut item: syn::ItemFn) -> TokenStream {
let name = meta.name.unwrap_or_else(|| item.sig.ident.to_string());
let construct = match meta.span.as_ref() {
Some(span) => quote! { with_span(#name, Some(#span.into_raw())) },
None => quote! { new(#name) },
};
item.block.stmts.insert(
0,
parse_quote! {
let __scope = ::typst_timing::TimingScope::#construct;
},
);
item.into_token_stream()
}
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