maomi-macro 0.1.0

A rust wasm framework for building pages with components (helper macros)
Documentation 
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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::*;
use syn::parse::*;

mod template;
mod simple_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>,
    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 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,
            root,
        })
    }
}
impl ToTokens for TemplateDefinition {
    fn to_tokens(&self, tokens: &mut TokenStream2) {
        let Self { name, generics, template_generics, root } = self;
        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);
            if __is_update { None } else { Some(ret) }
        };
        let template_trait_fn_body = quote! {
            let rc = __owner.rc();
            let __owner2 = unsafe { rc.borrow_mut_unsafe_with(__owner) };
            __owner2.as_component::<#name>().__template(__owner, __operation)
        };
        if template_generics.is_some() {
            tokens.append_all(quote! {
                impl #generics #name {
                    fn __template(&self, __owner: &mut ComponentNodeRefMut #template_generics , __operation: ComponentTemplateOperation) -> Option<Vec<NodeRc #template_generics >> {
                        #template_fn_body
                    }
                }
                impl #generics ComponentTemplate #template_generics for #name {
                    fn template(__owner: &mut ComponentNodeRefMut #template_generics , __operation: ComponentTemplateOperation) -> Option<Vec<NodeRc #template_generics >> where Self: Sized {
                        #template_trait_fn_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 {
                    fn __template<B: Backend>(&self, __owner: &mut ComponentNodeRefMut<B>, __operation: ComponentTemplateOperation) -> Option<Vec<NodeRc<B>>> {
                        #template_fn_body
                    }
                }
                impl #combined_generics ComponentTemplate<B> for #name {
                    fn template(__owner: &mut ComponentNodeRefMut<B>, __operation: ComponentTemplateOperation) -> Option<Vec<NodeRc<B>>> where Self: Sized {
                        #template_trait_fn_body
                    }
                }
            });
        }
    }
}
#[proc_macro]
pub fn template(input: TokenStream) -> TokenStream {
    let input = parse_macro_input!(input as TemplateDefinition);
    let ret = quote! {
        #input
    };
    TokenStream::from(ret)
}