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|
use proc_macro2::TokenStream;
use quote::quote;
use syn::parse::{Parse, ParseStream};
use syn::{Attribute, Ident, Result};
use crate::util::{
determine_name_and_title, documentation, foundations, kw, parse_flag, parse_string,
parse_string_array, BareType,
};
/// Expand the `#[ty]` macro.
pub fn ty(stream: TokenStream, item: syn::Item) -> Result<TokenStream> {
let meta: Meta = syn::parse2(stream)?;
let bare: BareType;
let (ident, attrs, keep) = match &item {
syn::Item::Struct(item) => (&item.ident, &item.attrs, true),
syn::Item::Type(item) => (&item.ident, &item.attrs, true),
syn::Item::Enum(item) => (&item.ident, &item.attrs, true),
syn::Item::Verbatim(item) => {
bare = syn::parse2(item.clone())?;
(&bare.ident, &bare.attrs, false)
}
_ => bail!(item, "invalid type item"),
};
let ty = parse(meta, ident.clone(), attrs)?;
Ok(create(&ty, keep.then_some(&item)))
}
/// Holds all relevant parsed data about a type.
struct Type {
meta: Meta,
/// The name for this type given in Rust.
ident: Ident,
/// The type's identifier as exposed to Typst.
name: String,
long: String,
/// The type's title case name.
title: String,
/// The documentation for this type as a string.
docs: String,
}
/// The `..` in `#[ty(..)]`.
struct Meta {
/// Whether this element has an associated scope defined by the `#[scope]` macro.
scope: bool,
/// Whether a custom cast implementation will be defined for this type.
cast: bool,
name: Option<String>,
title: Option<String>,
keywords: Vec<String>,
}
impl Parse for Meta {
fn parse(input: ParseStream) -> Result<Self> {
Ok(Self {
scope: parse_flag::<kw::scope>(input)?,
cast: parse_flag::<kw::cast>(input)?,
name: parse_string::<kw::name>(input)?,
title: parse_string::<kw::title>(input)?,
keywords: parse_string_array::<kw::keywords>(input)?,
})
}
}
/// Parse details about the type from its definition.
fn parse(meta: Meta, ident: Ident, attrs: &[Attribute]) -> Result<Type> {
let docs = documentation(attrs);
let (name, title) =
determine_name_and_title(meta.name.clone(), meta.title.clone(), &ident, None)?;
let long = title.to_lowercase();
Ok(Type { meta, ident, name, long, title, docs })
}
/// Produce the output of the macro.
fn create(ty: &Type, item: Option<&syn::Item>) -> TokenStream {
let Type { ident, name, long, title, docs, meta, .. } = ty;
let Meta { keywords, .. } = meta;
let constructor = if meta.scope {
quote! { <#ident as #foundations::NativeScope>::constructor() }
} else {
quote! { None }
};
let scope = if meta.scope {
quote! { <#ident as #foundations::NativeScope>::scope() }
} else {
quote! { #foundations::Scope::new() }
};
let cast = (!meta.cast).then(|| {
quote! {
#foundations::cast! { type #ident, }
}
});
let data = quote! {
#foundations::NativeTypeData {
name: #name,
long_name: #long,
title: #title,
docs: #docs,
keywords: &[#(#keywords),*],
constructor: ::std::sync::LazyLock::new(|| #constructor),
scope: ::std::sync::LazyLock::new(|| #scope),
}
};
let attr = item.map(|_| {
quote! {
#[allow(rustdoc::broken_intra_doc_links)]
}
});
quote! {
#attr
#item
#cast
impl #foundations::NativeType for #ident {
const NAME: &'static str = #name;
fn data() -> &'static #foundations::NativeTypeData {
static DATA: #foundations::NativeTypeData = #data;
&DATA
}
}
}
}
|
