Initial stab at macros 1.1

2 files changed, 42 insertions, 0 deletions

diff --git a/askama_codegen/Cargo.toml b/askama_codegen/Cargo.toml
new file mode 100644
index 0000000..29043aa
--- /dev/null
+++ b/askama_codegen/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "askama_codegen"
+version = "0.1.0"
+authors = ["Dirkjan Ochtman <dirkjan@ochtman.nl>"]
+
+[dependencies]
+syn = "0.10"
+quote = "0.3"
+
+[lib]
+proc-macro = true
diff --git a/askama_codegen/src/lib.rs b/askama_codegen/src/lib.rs
new file mode 100644
index 0000000..6d7170e
--- /dev/null
+++ b/askama_codegen/src/lib.rs
@@ -0,0 +1,31 @@
+#![feature(proc_macro, proc_macro_lib)]
+
+extern crate proc_macro;
+#[macro_use]
+extern crate quote;
+extern crate syn;
+
+use proc_macro::TokenStream;
+
+#[proc_macro_derive(Template, attributes(template))]
+pub fn derive_template(input: TokenStream) -> TokenStream {
+    let source = input.to_string();
+
+    let ast = syn::parse_macro_input(&source).unwrap();
+    let _ctx = match ast.body {
+        syn::Body::Struct(ref data) => data,
+        _ => panic!("#[derive(Template)] can only be used with structs"),
+    };
+
+    let name = &ast.ident;
+    let (impl_generics, ty_generics, where_clause) = ast.generics.split_for_impl();
+    let expanded = quote! {
+        impl #impl_generics askama::Template for #name #ty_generics #where_clause {
+             fn render(&self) -> String {
+                 "hello world, bar".to_string()
+             }
+        }
+    };
+
+    expanded.parse().unwrap()
+}