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#![recursion_limit = "128"]
extern crate proc_macro;
use proc_macro::TokenStream;
use proc_macro2::TokenStream as TokenStream2;
use quote::*;
use syn::parse::*;
use syn::*;
mod simple_template;
mod template;
mod xml_template;
#[proc_macro_attribute]
pub fn serializable_component(_attr: TokenStream, item: TokenStream) -> TokenStream {
let input = parse_macro_input!(item as SerializableComopnentDefinition);
let ret = quote! {
#input
};
TokenStream::from(ret)
}
struct SerializableComopnentDefinition {
item_impl: ItemImpl,
}
impl Parse for SerializableComopnentDefinition {
fn parse(input: ParseStream) -> Result<Self> {
let mut item_impl: ItemImpl = input.parse()?;
let ser_item: ImplItem = parse_str(
r#"
fn serialize(&self) -> Vec<u8> {
component_serializer::serialize(self)
}
"#,
)
.unwrap();
let de_item: ImplItem = parse_str(
r#"
fn deserialize(&mut self, data: &[u8]) {
component_serializer::deserialize(self, data)
}
"#,
)
.unwrap();
item_impl.items.push(ser_item);
item_impl.items.push(de_item);
Ok(Self { item_impl })
}
}
impl ToTokens for SerializableComopnentDefinition {
fn to_tokens(&self, tokens: &mut TokenStream2) {
let Self { item_impl } = self;
tokens.append_all(quote! { #item_impl });
}
}
#[derive(Clone)]
struct TemplateDefinition {
name: Path,
generics: Option<Generics>,
template_generics: Option<Generics>,
skin: Option<Ident>,
root: template::TemplateShadowRoot,
}
impl Parse for TemplateDefinition {
fn parse(input: ParseStream) -> Result<Self> {
let format: Ident = input.parse()?;
let lookahead = input.lookahead1();
let generics: Option<Generics> = if lookahead.peek(Token![<]) {
Some(input.parse()?)
} else {
None
};
input.parse::<Token![for]>()?;
let lookahead = input.lookahead1();
let template_generics = if lookahead.peek(Token![<]) {
Some(input.parse()?)
} else {
None
};
let name = input.parse()?;
let lookahead = input.lookahead1();
let skin: Option<Ident> = if lookahead.peek(Token![~]) {
input.parse::<Token![~]>()?;
Some(input.parse()?)
} else {
None
};
let root = match format.to_string().as_str() {
"xml" => xml_template::parse_template(input)?,
"tmpl" => simple_template::parse_template(input)?,
_ => return Err(Error::new(format.span(), "unrecognized template format")),
};
Ok(Self {
name,
generics,
template_generics,
skin,
root,
})
}
}
impl ToTokens for TemplateDefinition {
fn to_tokens(&self, tokens: &mut TokenStream2) {
let Self {
name,
generics,
template_generics,
skin,
root,
} = self;
let skin_body = match skin {
Some(x) => quote! { #x },
None => quote! { "" },
};
let skin_prefix = match skin {
Some(x) => {
let x = LitStr::new(&(x.to_string() + "-"), proc_macro2::Span::call_site());
quote! { #x }
}
None => quote! { "" },
};
let template_fn_body = quote! {
let shadow_root_fn = #root;
let sr = __owner.shadow_root_rc().clone();
let __is_update = if let ComponentTemplateOperation::Update = __operation { true } else { false };
let __update_to = if __is_update { Some(&sr) } else { None };
let ret: Vec<NodeRc<_>> = shadow_root_fn(__owner, __update_to, #skin_prefix);
if __is_update { None } else { Some(ret) }
};
let template_trait_fn_body = quote! {
let rc = __owner.rc();
let __owner2 = unsafe { rc.deref_mut_unsafe() };
unsafe { __owner2.as_component::<#name>().__template(__owner, __operation) }
};
if template_generics.is_some() {
tokens.append_all(quote! {
impl #generics #name {
unsafe fn __template(&self, __owner: &mut ComponentNode #template_generics , __operation: ComponentTemplateOperation) -> Option<Vec<NodeRc #template_generics >> {
#template_fn_body
}
}
impl #generics ComponentTemplate #template_generics for #name {
fn template(__owner: &mut ComponentNode #template_generics , __operation: ComponentTemplateOperation) -> Option<Vec<NodeRc #template_generics >> where Self: Sized {
#template_trait_fn_body
}
fn template_skin() -> &'static str {
#skin_body
}
}
});
} else {
let combined_generics = match &generics {
Some(x) => {
let params = &x.params;
quote! { <B: Backend, #params> }
}
None => {
quote! { <B: Backend> }
}
};
tokens.append_all(quote! {
impl #generics #name {
unsafe fn __template<B: Backend>(&self, __owner: &mut ComponentNode<B>, __operation: ComponentTemplateOperation) -> Option<Vec<NodeRc<B>>> {
#template_fn_body
}
}
impl #combined_generics ComponentTemplate<B> for #name {
fn template(__owner: &mut ComponentNode<B>, __operation: ComponentTemplateOperation) -> Option<Vec<NodeRc<B>>> where Self: Sized {
#template_trait_fn_body
}
fn template_skin() -> &'static str {
#skin_body
}
}
});
}
}
}
#[proc_macro]
pub fn template(input: TokenStream) -> TokenStream {
let input = parse_macro_input!(input as TemplateDefinition);
let ret = quote! {
#input
};
TokenStream::from(ret)
}