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feat: Add a define_once method

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This commit is contained in:
Jeremy Wall 2023-08-18 17:12:31 -04:00
parent e1d1b2c80b
commit 4f860a242b
1 changed files with 13 additions and 2 deletions
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15
macros/src/lib.rs
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@ -96,7 +96,7 @@ fn expand_component_def(
} }
} }
fn expand_struct_trait_shim(struct_name: &Ident, observed_attrs: Literal) -> syn::ItemImpl { fn expand_struct_trait_shim(struct_name: &Ident, once_name: &Ident, observed_attrs: Literal) -> syn::ItemImpl {
let trait_path = expand_crate_ref("wasm-web-component", parse_quote!(WebComponentDef)); let trait_path = expand_crate_ref("wasm-web-component", parse_quote!(WebComponentDef));
let handle_path = expand_crate_ref("wasm-web-component", parse_quote!(WebComponentHandle)); let handle_path = expand_crate_ref("wasm-web-component", parse_quote!(WebComponentHandle));
parse_quote! { parse_quote! {
@ -109,6 +109,14 @@ fn expand_struct_trait_shim(struct_name: &Ident, observed_attrs: Literal) -> syn
<Self as #trait_path>::class_name() <Self as #trait_path>::class_name()
} }
#[doc = "Defines this web component element exactly once. Subsequent calls are noops."]
pub fn define_once() {
#once_name.call_once(|| {
let _ = Self::define();
});
}
#[doc = "Defines this web component element if not defined already otherwise returns an error."]
pub fn define() -> std::result::Result<#handle_path, JsValue> { pub fn define() -> std::result::Result<#handle_path, JsValue> {
use wasm_bindgen::JsCast; use wasm_bindgen::JsCast;
use web_sys::{window, Element, HtmlElement}; use web_sys::{window, Element, HtmlElement};
@ -238,11 +246,14 @@ fn expand_struct(
observed_attributes: Literal, observed_attributes: Literal,
) -> TokenStream { ) -> TokenStream {
let struct_name = item_struct.ident.clone(); let struct_name = item_struct.ident.clone();
let struct_once_name = Ident::new(&(struct_name.to_string() + "Once"), Span::call_site());
let component_def = expand_component_def(&struct_name, &class_name, &element_name); let component_def = expand_component_def(&struct_name, &class_name, &element_name);
let non_wasm_impl = expand_struct_trait_shim(&struct_name, observed_attributes); let non_wasm_impl = expand_struct_trait_shim(&struct_name, &struct_once_name, observed_attributes);
let wasm_shim = expand_wasm_shim(&struct_name); let wasm_shim = expand_wasm_shim(&struct_name);
let binding_trait = expand_binding(&struct_name); let binding_trait = expand_binding(&struct_name);
let expanded = quote! { let expanded = quote! {
use std::sync::Once;
static #struct_once_name: Once = Once::new();
#[wasm_bindgen::prelude::wasm_bindgen] #[wasm_bindgen::prelude::wasm_bindgen]
#[derive(Default, Debug)] #[derive(Default, Debug)]
#item_struct #item_struct