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https://codeberg.org/unspeaker/tengri.git
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proc: simplify expose macro
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parent
cba23a005c
commit
7570aefcc2
5 changed files with 288 additions and 405 deletions
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@ -1,52 +1,20 @@
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use crate::*;
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pub(crate) fn view_impl (meta: TokenStream, data: TokenStream) -> TokenStream {
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let mut out = TokenStream2::new();
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ViewDefinition {
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meta: parse_macro_input!(meta as ViewMeta),
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data: parse_macro_input!(data as ViewImpl),
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}.to_tokens(&mut out);
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out.into()
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}
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#[derive(Debug, Clone)]
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pub(crate) struct ViewDef(pub(crate) ViewMeta, pub(crate) ViewImpl);
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#[derive(Debug, Clone)]
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struct ViewDefinition {
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meta: ViewMeta,
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data: ViewImpl,
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}
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#[derive(Debug, Clone)]
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struct ViewMeta {
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pub(crate) struct ViewMeta {
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output: Ident,
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}
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#[derive(Debug, Clone)]
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struct ViewImpl {
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target: Ident,
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items: Vec<ViewItem>,
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syms: Vec<ViewSym>,
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pub(crate) struct ViewImpl {
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block: ItemImpl,
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exposed: BTreeMap<String, Ident>,
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}
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#[derive(Debug, Clone)]
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struct ViewItem {
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item: ImplItem,
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expose: Option<Literal>,
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}
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#[derive(Debug, Clone)]
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struct ViewSym {
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symbol: Literal,
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name: Ident,
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}
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impl Parse for ViewDefinition {
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fn parse (input: ParseStream) -> Result<Self> {
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Ok(Self {
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meta: input.parse::<ViewMeta>()?,
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data: input.parse::<ViewImpl>()?,
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})
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}
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}
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struct ViewArm(String, Ident);
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impl Parse for ViewMeta {
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fn parse (input: ParseStream) -> Result<Self> {
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@ -58,68 +26,52 @@ impl Parse for ViewMeta {
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impl Parse for ViewImpl {
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fn parse (input: ParseStream) -> Result<Self> {
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let _ = input.parse::<Token![impl]>()?;
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let mut syms = vec![];
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Ok(Self {
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target: input.parse::<Ident>()?,
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items: {
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let group;
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let brace = braced!(group in input);
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let mut items = vec![];
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while !group.is_empty() {
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let item = group.parse::<ViewItem>()?;
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if let Some(expose) = &item.expose {
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if let ImplItem::Fn(ref item) = item.item {
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let symbol = expose.clone();
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let name = item.sig.ident.clone();
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syms.push(ViewSym { symbol, name })
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} else {
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return Err(
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input.error("only fn items can be exposed to #[tengri::view]")
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)
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}
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}
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items.push(item);
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let block = input.parse::<ItemImpl>()?;
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let mut exposed: BTreeMap<String, Ident> = Default::default();
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for item in block.items.iter() {
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if let ImplItem::Fn(ImplItemFn { sig: Signature { ident, .. }, .. }) = item {
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let key = format!(":{}", AsKebabCase(format!("{}", &ident)));
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if exposed.contains_key(&key) {
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return Err(input.error(format!("already defined: {ident}")));
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}
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items
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},
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syms,
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})
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exposed.insert(key, ident.clone());
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}
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}
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Ok(Self { block, exposed })
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}
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}
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impl Parse for ViewItem {
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fn parse (input: ParseStream) -> Result<Self> {
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let mut expose = None;
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Ok(Self {
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item: {
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let mut item = input.parse::<ImplItem>()?;
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if let ImplItem::Fn(ref mut item) = item {
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item.attrs = item.attrs.iter().filter(|attr| {
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if let Attribute {
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meta: Meta::List(MetaList { path, tokens, .. }), ..
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} = attr
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&& path.segments.len() == 2
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&& nth_segment_is(&path.segments, 0, "tengri")
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&& nth_segment_is(&path.segments, 1, "view")
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&& let Some(TokenTree::Literal(name)) = tokens.clone().into_iter().next()
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{
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expose = Some(name);
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return false
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}
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true
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}).map(|x|x.clone()).collect();
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};
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item
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},
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expose,
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})
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}
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}
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impl ToTokens for ViewSym {
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impl ToTokens for ViewDef {
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fn to_tokens (&self, out: &mut TokenStream2) {
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let Self(ViewMeta { output }, ViewImpl { block, exposed }) = self;
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let ident = &block.self_ty;
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let exposed: Vec<_> = exposed.iter().map(|(k,v)|ViewArm(k.clone(), v.clone())).collect();
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for token in quote! {
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#block
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/// Generated by [tengri_proc].
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impl ::tengri::output::Content<#output> for #ident {
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fn content (&self) -> impl Render<#output> {
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self.size.of(::tengri::output::View(self, self.config.view))
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}
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}
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/// Generated by [tengri_proc].
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impl<'a> ::tengri::output::ViewContext<'a, #output> for #ident {
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fn get_content_sym (&'a self, value: &Value<'a>) -> Option<RenderBox<'a, #output>> {
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match value {
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#(#exposed)*
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_ => panic!("expected Sym(content), got: {value:?}")
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}
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}
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}
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} {
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out.append(token)
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}
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}
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}
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impl ToTokens for ViewArm {
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fn to_tokens (&self, out: &mut TokenStream2) {
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let Self(key, value) = self;
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out.append(Punct::new(':', Joint));
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out.append(Punct::new(':', Alone));
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out.append(Ident::new("tengri", Span::call_site()));
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@ -134,7 +86,7 @@ impl ToTokens for ViewSym {
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out.append(Ident::new("Sym", Span::call_site()));
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out.append(Group::new(Delimiter::Parenthesis, {
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let mut out = TokenStream2::new();
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out.append(self.symbol.clone());
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out.append(LitStr::new(key, Span::call_site()).token());
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out
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}));
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out.append(Punct::new('=', Joint));
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@ -144,7 +96,7 @@ impl ToTokens for ViewSym {
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let mut out = TokenStream2::new();
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out.append(Ident::new("self", Span::call_site()));
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out.append(Punct::new('.', Alone));
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out.append(self.name.clone());
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out.append(value.clone());
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out.append(Group::new(Delimiter::Parenthesis, TokenStream2::new()));
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out.append(Punct::new('.', Alone));
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out.append(Ident::new("boxed", Span::call_site()));
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@ -155,43 +107,42 @@ impl ToTokens for ViewSym {
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}
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}
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impl ToTokens for ViewItem {
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fn to_tokens (&self, out: &mut TokenStream2) {
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self.item.to_tokens(out)
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}
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}
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impl ToTokens for ViewDefinition {
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fn to_tokens (&self, out: &mut TokenStream2) {
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let Self {
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meta: ViewMeta { output },
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data: ViewImpl { target, syms, items },
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} = self;
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for token in quote! {
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/// Augmented by [tengri_proc].
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impl #target {
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#(#items)*
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}
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/// Generated by [tengri_proc].
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impl ::tengri::output::Content<#output> for #target {
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fn content (&self) -> impl Render<#output> {
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self.size.of(::tengri::output::View(self, self.config.view))
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}
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}
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/// Generated by [tengri_proc].
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impl<'a> ::tengri::output::ViewContext<'a, #output> for #target {
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fn get_content_sym (&'a self, value: &Value<'a>) -> Option<RenderBox<'a, #output>> {
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match value {
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#(#syms)*
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_ => panic!("expected Sym(content), got: {value:?}")
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}
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}
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}
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} {
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out.append(token)
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}
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}
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}
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//impl ToTokens for ViewSym {
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//fn to_tokens (&self, out: &mut TokenStream2) {
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//out.append(Punct::new(':', Joint));
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//out.append(Punct::new(':', Alone));
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//out.append(Ident::new("tengri", Span::call_site()));
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//out.append(Punct::new(':', Joint));
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//out.append(Punct::new(':', Alone));
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//out.append(Ident::new("dsl", Span::call_site()));
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//out.append(Punct::new(':', Joint));
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//out.append(Punct::new(':', Alone));
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//out.append(Ident::new("Value", Span::call_site()));
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//out.append(Punct::new(':', Joint));
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//out.append(Punct::new(':', Alone));
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//out.append(Ident::new("Sym", Span::call_site()));
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//out.append(Group::new(Delimiter::Parenthesis, {
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//let mut out = TokenStream2::new();
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//out.append(self.symbol.clone());
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//out
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//}));
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//out.append(Punct::new('=', Joint));
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//out.append(Punct::new('>', Alone));
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//out.append(Ident::new("Some", Span::call_site()));
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//out.append(Group::new(Delimiter::Parenthesis, {
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//let mut out = TokenStream2::new();
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//out.append(Ident::new("self", Span::call_site()));
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//out.append(Punct::new('.', Alone));
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//out.append(self.name.clone());
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//out.append(Group::new(Delimiter::Parenthesis, TokenStream2::new()));
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//out.append(Punct::new('.', Alone));
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//out.append(Ident::new("boxed", Span::call_site()));
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//out.append(Group::new(Delimiter::Parenthesis, TokenStream2::new()));
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//out
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//}));
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//out.append(Punct::new(',', Alone));
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//}
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//}
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fn nth_segment_is (segments: &Punctuated<PathSegment, PathSep>, n: usize, x: &str) -> bool {
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if let Some(PathSegment { arguments: PathArguments::None, ident, .. }) = segments.get(n) {
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@ -202,17 +153,17 @@ fn nth_segment_is (segments: &Punctuated<PathSegment, PathSep>, n: usize, x: &st
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return false
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}
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impl std::cmp::PartialEq for ViewItem {
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fn eq (&self, other: &Self) -> bool {
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self.item == other.item && (format!("{:?}", self.expose) == format!("{:?}", other.expose))
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}
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}
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//impl std::cmp::PartialEq for ViewItem {
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//fn eq (&self, other: &Self) -> bool {
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//self.item == other.item && (format!("{:?}", self.expose) == format!("{:?}", other.expose))
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//}
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//}
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impl std::cmp::PartialEq for ViewSym {
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fn eq (&self, other: &Self) -> bool {
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self.name == other.name && (format!("{}", self.symbol) == format!("{}", other.symbol))
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}
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}
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//impl std::cmp::PartialEq for ViewSym {
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//fn eq (&self, other: &Self) -> bool {
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//self.name == other.name && (format!("{}", self.symbol) == format!("{}", other.symbol))
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//}
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//}
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#[cfg(test)] #[test] fn test_view_meta () {
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let x: ViewMeta = pq! { SomeOutput };
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@ -221,6 +172,7 @@ impl std::cmp::PartialEq for ViewSym {
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}
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#[cfg(test)] #[test] fn test_view_impl () {
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// TODO
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let x: ViewImpl = pq! {
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impl Foo {
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/// docstring1
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@ -232,20 +184,20 @@ impl std::cmp::PartialEq for ViewSym {
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}
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};
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let expected_target: Ident = pq! { Foo };
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assert_eq!(x.target, expected_target);
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assert_eq!(x.items.len(), 2);
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assert_eq!(x.items[0].item, pq! {
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/// docstring1
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#[bar] fn a_view () {}
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});
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assert_eq!(x.items[1].item, pq! {
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#[baz]
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/// docstring2
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#[baz] fn is_not_view () {}
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});
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assert_eq!(x.syms, vec![
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ViewSym { symbol: pq! { ":view1" }, name: pq! { a_view }, },
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]);
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//assert_eq!(x.target, expected_target);
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//assert_eq!(x.items.len(), 2);
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//assert_eq!(x.items[0].item, pq! {
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///// docstring1
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//#[bar] fn a_view () {}
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//});
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//assert_eq!(x.items[1].item, pq! {
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//#[baz]
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///// docstring2
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//#[baz] fn is_not_view () {}
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//});
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//assert_eq!(x.syms, vec![
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//ViewArm( { symbol: pq! { ":view1" }, name: pq! { a_view }, },
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//]);
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}
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#[cfg(test)] #[test] fn test_view_definition () {
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