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12 changed files with 499 additions and 347 deletions
214
proc/src/lib.rs
214
proc/src/lib.rs
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@ -167,69 +167,18 @@ attribute!(commands {
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let mut keywords = quote! {};
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let mut expressions = quote! {};
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for (ident, (variant, inputs, keyword)) in items.iter() {
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let mut typed = quote! {};
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let mut params = quote! {};
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let mut has_args = false;
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for arg in inputs.iter() {
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if let FnArg::Typed(PatType { pat, ty, .. }) = arg {
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has_args = true;
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append(&mut typed, quote! { #pat: #ty, });
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append(&mut params, quote! { #pat, });
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}
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}
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append(&mut variants, if has_args {
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quote! { #variant { #typed }, }
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} else {
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quote! { #variant, }
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});
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append(&mut dispatch, if has_args {
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quote! { #command::#variant { #params } => state.#ident(#params), }
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} else {
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quote! { #command::#variant => state.#ident(), }
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});
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let keyword = if let Some(namespace) = namespace {
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format!("{}/{}", namespace.value(), keyword.value())
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} else {
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keyword.value()
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};
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if has_args {
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append(&mut expressions, quote! {
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#keyword (#typed) => { #command::#variant { #params } },
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});
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} else {
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append(&mut keywords, quote! {
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#keyword => #command::#variant,
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});
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}
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write_variant(
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&mut expressions, &mut keywords, &mut variants, &mut dispatch,
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ident, command, variant, inputs, namespace, keyword,
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)
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}
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let impls = match item {
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Item::Impl(ItemImpl { generics, .. }) => {
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let lts = Punctuated::<_, Comma>::from_iter(generics.lifetimes());
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let tys = Punctuated::<_, Comma>::from_iter(generics.type_params());
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let cns = Punctuated::<_, Comma>::from_iter(generics.const_params());
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quote! {
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impl<'n, #tys> dizzle::Namespace<'n, #command> for #state {
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symbols!('n |state: Self| -> #command { #keywords });
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expressions!('n |state: Self| -> #command { #expressions });
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}
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impl #generics #command {
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pub fn act (self, state: &mut #state) -> Perhaps<Self> {
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match self { #dispatch _ => unreachable!() }
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}
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}
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}
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},
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Item::Trait { .. } => quote! {
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impl<'n, T: #state + 'n> dizzle::Namespaced<'n, T> for #command {
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symbols!('n |state: T| -> Self { #keywords });
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expressions!('n |state: T| -> Self { #expressions });
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}
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impl #command {
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pub fn act <'n, T: #state + 'n> (self, state: &mut T) -> Perhaps<Self> {
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match self { #dispatch _ => unreachable!() }
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}
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}
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},
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Item::Impl(ItemImpl { generics, .. }) => write_for_struct(
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keywords, expressions, dispatch, state, command, generics,
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),
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Item::Trait { .. } => write_for_trait(
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keywords, expressions, dispatch, state, command,
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),
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_ => panic!("trait or inherent impl needed for #[commands]")
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};
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append(out, quote! {
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@ -240,6 +189,145 @@ attribute!(commands {
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})
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}
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}
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fn write_variant (
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exps: &mut TokenStream2,
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syms: &mut TokenStream2,
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vars: &mut TokenStream2,
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disp: &mut TokenStream2,
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ident: &Ident,
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command: &Path,
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variant: &Ident,
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inputs: &[FnArg],
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namespace: &Option<LitStr>,
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keyword: &LitStr,
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) {
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let keyword = if let Some(namespace) = namespace {
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format!("{}/{}", namespace.value(), keyword.value())
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} else {
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keyword.value()
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};
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let mut typed = quote! {};
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let mut params = quote! {};
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let mut obtain = quote! {};
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let mut has_args = false;
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for arg in inputs.iter() {
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if let FnArg::Typed(PatType { pat, ty, .. }) = arg {
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has_args = true;
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append(&mut typed, quote! { #pat: #ty, });
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append(&mut params, quote! { #pat, });
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append(&mut obtain, quote! { let #pat: #ty = {
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let head = tail.head()?.unwrap_or_default();
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let tail = tail.tail()?.unwrap_or_default();
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match dizzle::Namespace::<#ty>::namespace(state, &head)? {
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Some(arg) => arg,
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None => return Err(format!("{}: arg \"{}\" ({}) got: {head} {tail}",
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#keyword, stringify!(#pat), stringify!(#ty),
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).into())
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}
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};});
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}
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}
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if has_args {
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append(vars, quote! { #variant { #typed }, });
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append(disp, quote! { #command::#variant { #params } => state.#ident(#params), });
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append(exps, quote! {
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let tail_base = tail;
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if head.src()? == Some(#keyword) {
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let tail = tail_base;
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#obtain
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return Ok(Some(#command::#variant { #params }))
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}
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});
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} else {
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append(vars, quote! { #variant, });
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append(disp, quote! { #command::#variant => state.#ident(), });
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append(syms, quote! {
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if word == #keyword { return Ok(Some(#command::#variant)); }
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});
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}
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}
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fn write_for_struct (
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syms: TokenStream2,
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exps: TokenStream2,
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disp: TokenStream2,
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state: &Path,
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command: &Path,
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generics: &syn::Generics,
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) -> TokenStream2 {
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//let lts = Punctuated::<_, Comma>::from_iter(generics.lifetimes());
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//let cns = Punctuated::<_, Comma>::from_iter(generics.const_params());
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let tys = Punctuated::<_, Comma>::from_iter(generics.type_params());
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quote! {
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impl<#tys> dizzle::Namespace<#command> for #state {
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//def_namespace_symbols!('n |state: Self| -> #command {
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//#syms
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//});
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//def_namespace_exps!('n |state: Self| -> #command {
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//#exps
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//});
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fn namespace_symbol (&self, word: impl Symbol) -> Perhaps<#command> {
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if let Some(word) = word.word()? {
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#syms
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}
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Ok(None)
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}
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fn namespace_expression (&self, expr: impl Expression) -> Perhaps<#command> {
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let state = self;
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if let Some(expr) = expr.expr()? {
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let head = expr.head()?;
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let tail = expr.tail()?;
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#exps
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}
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Ok(None)
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}
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}
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impl #generics dizzle::Dispatch<#state> for #command {
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fn dispatch (self, state: &mut #state) -> Perhaps<Self> {
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match self {
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#disp
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_ => unreachable!()
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}
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}
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}
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}
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}
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fn write_for_trait (
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syms: TokenStream2,
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exps: TokenStream2,
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disp: TokenStream2,
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state: &Path,
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command: &Path,
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) -> TokenStream2 {
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quote! {
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impl<T: #state> dizzle::Namespaced<T> for #command {
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fn namespaced_symbol <L: Symbol> (state: &T, word: L) -> Perhaps<#command> {
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if let Some(word) = word.word()? {
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#syms
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}
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Ok(None)
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}
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fn namespaced_expression <L: Expression> (state: &T, expr: L) -> Perhaps<#command> {
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if let Some(expr) = expr.expr()? {
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let head = expr.head()?;
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let tail = expr.tail()?;
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#exps
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}
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Ok(None)
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}
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}
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impl<T: #state> dizzle::Dispatch<T> for #command {
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fn dispatch (self, state: &mut T) -> Perhaps<Self> {
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match self {
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#disp
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_ => unreachable!()
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}
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}
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}
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}
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}
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});
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attribute!(command {
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@ -393,8 +481,8 @@ attribute!(keyword {
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append(out, quote! {
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#item
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impl<'n> Namespace<'n, #ident> for #state {
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symbols!('n |_state: #state| -> #ident { #body, });
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impl Namespace<#ident> for #state {
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def_namespace_symbols!(|_state: #state| -> #ident { #body, });
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}
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})
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}
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