get stuff on screen

enterprise-compiler/src/lib.rs

@@ -11,7 +11,9 @@ use proc_macro2::{Span, TokenStream, TokenTree};
 use quote::ToTokens;
 use syn::{punctuated::Punctuated, Expr, ExprPath, Ident, Path, PathArguments, PathSegment};
 
-#[derive(Debug, PartialEq, Eq, Hash)]
+type Id = String;
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
 enum TagLhs {
     Bind(String),
     On(String),
@@ -19,18 +21,32 @@ enum TagLhs {
 }
 
 #[derive(Debug, Default)]
-struct Tag {
+struct Elem<T> {
     tag: String,
     attrs: HashMap<TagLhs, String>,
-    inner: Vec<Rsx>,
+    inner: Vec<T>,
 }
 
 #[derive(Debug)]
 enum Rsx {
-    Tag(Tag),
+    Elem(Elem<Rsx>),
     Code(Expr),
     Text(String),
-    // For(String, String, Vec<Rsx>),
+}
+
+#[derive(Debug)]
+enum TaggedRsx {
+    Elem(Id, Elem<TaggedRsx>),
+    Code(Id, Expr),
+    Text(Id, String),
+}
+
+impl TaggedRsx {
+    pub fn get_id(&self) -> &str {
+        match self {
+            TaggedRsx::Elem(id, _) | TaggedRsx::Code(id, _) | TaggedRsx::Text(id, _) => id.as_ref(),
+        }
+    }
 }
 
 #[derive(Clone, Debug, Hash, PartialOrd, Ord, PartialEq, Eq)]
@@ -45,7 +61,7 @@ enum DepActions {
     Updates,
 }
 
-#[derive(Debug)]
+#[derive(Default, Debug)]
 struct DependencyGraph(DiGraphMap<u32, ()>);
 
 impl DependencyGraph {
@@ -55,21 +71,19 @@ impl DependencyGraph {
     }
 }
 
-#[derive(Debug)]
+#[derive(Default, Debug)]
 struct Visitor {
     idx: u32,
     deps: DependencyGraph,
     wtf: HashMap<u32, DepNode>,
     model: HashMap<String, String>,
+    impl_code: TokenStream,
 }
 
 impl Visitor {
     fn new() -> Visitor {
         Visitor {
-            idx: 0,
-            deps: DependencyGraph::new(),
-            wtf: HashMap::new(),
-            model: HashMap::new(),
+            ..Default::default()
         }
     }
 
@@ -92,13 +106,22 @@ impl Visitor {
         next
     }
 
-    fn visit(&mut self, nodes: &[Rsx]) {
-        for node in nodes {
+    fn make_graph(&mut self, nodes: &[Rsx]) -> Vec<TaggedRsx> {
+        nodes
+            .iter()
+            .map(|node| {
                 let node_id = self.unique_name("node");
-            println!("Visiting {}: {:?}", node_id, node);
                 match node {
-                Rsx::Tag(Tag { tag, attrs, inner }) => {
-                    self.visit(inner);
+                    Rsx::Elem(Elem { tag, attrs, inner }) => {
+                        let tag_inner = self.make_graph(&inner);
+                        TaggedRsx::Elem(
+                            node_id,
+                            Elem {
+                                tag: tag.to_string(),
+                                attrs: attrs.clone(),
+                                inner: tag_inner,
+                            },
+                        )
                     }
                     Rsx::Code(expr) => {
                         let deps = extract_model_dependencies(expr);
@@ -109,10 +132,55 @@ impl Visitor {
                                 self.deps.0.add_edge(from, to, ());
                             }
                         }
+
+                        TaggedRsx::Code(node_id, expr.clone())
+                    }
+                    Rsx::Text(literal) => TaggedRsx::Text(node_id, literal.clone()),
+                }
+            })
+            .collect()
+    }
+
+    fn gen_code(&mut self, nodes: &[TaggedRsx]) -> Vec<String> {
+        let mut names = Vec::new();
+        for node in nodes {
+            let node_id = node.get_id();
+            let make_node_id = format_ident!("make_{}", node_id);
+            match node {
+                TaggedRsx::Elem(node_id, Elem { tag, attrs, inner }) => {
+                    self.impl_code.extend(quote! {
+                        fn #make_node_id(&self) -> impl stdweb::web::IElement {
+                            let el = document().create_element(#tag).unwrap();
+                            el
+                        }
+                    });
+                    self.gen_code(&inner);
+                }
+                TaggedRsx::Code(node_id, expr) => {
+                    self.impl_code.extend(quote! {
+                        #[inline]
+                        fn #make_node_id(&self) -> impl stdweb::web::IElement {
+                            let el = document().create_element("span").expect("shouldn't fail");
+                            el.set_attribute("id", #node_id);
+                            el
+                        }
+                    });
+                }
+                TaggedRsx::Text(node_id, literal) => {
+                    self.impl_code.extend(quote! {
+                        #[inline]
+                        fn #make_node_id(&self) -> impl stdweb::web::IElement {
+                            let el = document().create_element("span").expect("shouldn't fail");
+                            el.set_text_content(#literal);
+                            el
+                        }
+                    });
                 }
                 _ => (),
             }
+            names.push(format!("{}", make_node_id));
         }
+        names
     }
 }
 
@@ -132,23 +200,23 @@ fn extract_model_dependencies(expr: &Expr) -> HashSet<String> {
 
 #[proc_macro]
 pub fn example(input_tokens: proc_macro::TokenStream) -> proc_macro::TokenStream {
-    let todomvc_name = "TodoMVC".to_string();
+    let helloworld_name = "HelloWorld".to_string();
 
-    let todomvc_datamodel: HashMap<String, String> = hashmap! {
+    let helloworld_datamodel: HashMap<String, String> = hashmap! {
         "name".into() => "String".into(),
     };
 
-    let todomvc_datainit: HashMap<String, String> = hashmap! {
+    let helloworld_datainit: HashMap<String, String> = hashmap! {
         "name".into() => "\"world\".into()".into(),
     };
 
-    let todomvc_dom = vec![
-        Rsx::Tag(Tag {
+    let helloworld_dom = vec![
+        Rsx::Elem(Elem {
             tag: "input".into(),
             attrs: hashmap! {
                 TagLhs::Bind("value".into()) => "name".into(),
             },
-            ..Tag::default()
+            inner: vec![],
         }),
         Rsx::Text("Hello, ".into()),
         Rsx::Code(syn::parse_str::<Expr>("name").unwrap()),
@@ -156,15 +224,16 @@ pub fn example(input_tokens: proc_macro::TokenStream) -> proc_macro::TokenStream
     ];
 
     let mut visitor = Visitor::new();
-    visitor.load_model(&todomvc_datamodel);
-    visitor.visit(&todomvc_dom);
+    visitor.load_model(&helloworld_datamodel);
+    let new_dom = visitor.make_graph(&helloworld_dom);
+    let toplevel_names = visitor.gen_code(&new_dom);
 
-    println!("{:?}", visitor);
+    // println!("{:?}", visitor);
     println!("DOT:");
     let graph: Graph<_, _, _> = visitor.deps.0.clone().into_graph();
     println!("{:?}", Dot::new(&graph));
 
-    let name = format_ident!("{}", todomvc_name);
+    let name = format_ident!("{}", helloworld_name);
     let mut model = TokenStream::new();
     let mut init = TokenStream::new();
     for (name, ty) in visitor.model {
@@ -173,26 +242,42 @@ pub fn example(input_tokens: proc_macro::TokenStream) -> proc_macro::TokenStream
         let ty = format_ident!("{}", ty);
         model.extend(quote! { #name : #ty , });
     }
-    for (name, value) in todomvc_datainit {
+    for (name, value) in helloworld_datainit {
         let name = format_ident!("{}", name);
         let value = syn::parse_str::<Expr>(&value).unwrap();
         init.extend(quote! { #name : #value , });
     }
+
+    let impl_code = &visitor.impl_code;
+    let mut init_el_code = TokenStream::new();
+    for fn_name in toplevel_names.iter() {
+        let fn_name = format_ident!("{}", fn_name);
+        init_el_code.extend(quote! {
+            let sub = self.#fn_name();
+            el.append_child(&sub);
+        });
+    }
+
     let result = quote! {
-        struct #name {
+        struct #name<B> {
+            _b: std::marker::PhantomData<B>,
             #model
         }
 
-        impl #name {
-            fn new() -> Self {
+        impl<B> #name<B> {
+            fn new(_: &B) -> Self {
                 #name {
+                    _b: std::marker::PhantomData::default(),
                     #init
                 }
             }
+
+            #impl_code
         }
 
-        impl crate::Component for #name {
+        impl<B: Backend> crate::Component<B> for #name<B> {
             fn initialize(&self, el: &crate::Element) {
+                #init_el_code
             }
         }
     };

src/backend.rs

@@ -0,0 +1,5 @@
+pub trait Backend {}
+
+pub struct Web;
+
+impl Backend for Web {}

src/main.rs

@@ -3,17 +3,22 @@ extern crate enterprise_compiler;
 #[macro_use]
 extern crate stdweb;
 
-use stdweb::web::{document, Element, INonElementParentNode};
+mod backend;
 
-trait Component {
+use stdweb::web::{document, Element, INode, IElement, INonElementParentNode};
+
+use crate::backend::{Backend, Web};
+
+trait Component<B: Backend> {
     fn initialize(&self, element: &Element);
 }
 
 example!();
 
-fn render<C: Component>(component: &C, id: impl AsRef<str>) {
+fn render<B: Backend, C: Component<B>>(component: &C, id: impl AsRef<str>) {
     let id = id.as_ref();
     if let Some(el) = document().get_element_by_id(id) {
+        println!("Rendering...");
         component.initialize(&el);
     }
 }
@@ -21,8 +26,9 @@ fn render<C: Component>(component: &C, id: impl AsRef<str>) {
 fn main() {
     stdweb::initialize();
 
-	let todomvc = TodoMVC::new();
-	render(&todomvc, "");
+    let web = Web;
+    let app = HelloWorld::new(&web);
+    render(&app, "app");
 
     let message = "Hello world!";
     js! { console.log(@{message}); }

static/index.html

@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html lang="en">
+    <head>
+        <meta charset="utf-8">
+        <title>what the Hek</title>
+    </head>
+    <body>
+        <div id="app"></div>
+        <script src="enterprise.js"></script>
+    </body>
+</html>