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Emit signal handler bindings and expressions for emitting signals in the Rust frontend

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This commit is contained in:
Simon Hausmann 2020-05-28 15:12:50 +02:00
parent a3892ea102
commit 97dc677854
1 changed files with 40 additions and 23 deletions
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63
api/sixtyfps-rs/sixtyfps-rs-macro/lib.rs
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@ -196,24 +196,28 @@ pub fn sixtyfps(stream: TokenStream) -> TokenStream {
quote!(#field_name.)
};
let rust_property = quote!(#rust_property_accessor_prefix#rust_property_ident);
let tokens_for_expression = compile_expression(binding_expression);
let v = compile_expression(binding_expression);
if v.is_none() {
// FIXME: this is because signals are not yet implemented
continue;
}
if binding_expression.is_constant() {
if matches!(item.lookup_property(k.as_str()), Type::Signal) {
init.push(quote!(
self_.#rust_property.set(#v);
));
} else {
init.push(quote!(
self_.#rust_property.set_binding(|context| {
self_.#rust_property.set_handler(|context, ()| {
let _self = context.component.downcast::<#component_id>().unwrap();
#v
#tokens_for_expression;
});
));
} else {
if binding_expression.is_constant() {
init.push(quote!(
self_.#rust_property.set(#tokens_for_expression);
));
} else {
init.push(quote!(
self_.#rust_property.set_binding(|context| {
let _self = context.component.downcast::<#component_id>().unwrap();
#tokens_for_expression
});
));
}
}
}
item_names.push(field_name);
@ -269,12 +273,12 @@ pub fn sixtyfps(stream: TokenStream) -> TokenStream {
result.into()
}
fn compile_expression(e: &Expression) -> Option<proc_macro2::TokenStream> {
Some(match e {
fn compile_expression(e: &Expression) -> proc_macro2::TokenStream {
match e {
Expression::StringLiteral(s) => quote!(sixtyfps::re_exports::SharedString::from(#s)),
Expression::NumberLiteral(n) => quote!(#n as _),
Expression::Cast { from, to } => {
let f = compile_expression(&*from)?;
let f = compile_expression(&*from);
match (from.ty(), to) {
(Type::Float32, Type::String) | (Type::Int32, Type::String) => {
quote!(sixtyfps::re_exports::SharedString::from(format("{}", #f).to_str()))
@ -293,19 +297,32 @@ fn compile_expression(e: &Expression) -> Option<proc_macro2::TokenStream> {
}
}
Expression::CodeBlock(sub) => {
if sub.iter().map(|e| compile_expression(e)).any(|e| e.is_none()) {
// fixme: Remove!
return None;
}
let map = sub.iter().map(|e| compile_expression(e));
quote!({ #(#map);* })
}
// FIXME: signals!
Expression::SignalReference { .. } => return None,
Expression::FunctionCall { .. } => return None,
Expression::SignalReference { element, name, .. } => {
let name_ident = quote::format_ident!("{}", name);
let e = element.upgrade().unwrap();
if !e.borrow().property_declarations.contains_key(name) {
let elem_ident = quote::format_ident!("{}", e.borrow().id);
quote!(_self.#elem_ident.#name_ident)
} else {
quote!(_self.#name_ident)
}
}
Expression::FunctionCall { function } => {
if matches!(function.ty(), Type::Signal) {
let base = compile_expression(function);
quote!(#base.emit(&context, ()))
} else {
let error = format!("the function {:?} is not a signal", e);
quote!(compile_error! {#error})
}
}
_ => {
let error = format!("unsupported expression {:?}", e);
quote!(compile_error! {#error})
}
})
}
}