Start work on new calyx builder API (#17)

* Start work on new calyx builder API

* In the middle of fixing but good progress

* It compiles

* Messy but works

* Some clean up

crates/pulsar-backend/src/calyx/builder/macros.rs

@@ -0,0 +1,46 @@
+// calyx `build_assignments!` but for `CalyxCell`s.
+#[macro_export(local_inner_macros)]
+macro_rules! build_assignments_2_aux {
+    // Unguarded assignment.
+    (@base $builder:expr;
+     $dst_node:ident[$dst_port:expr] = ? $src_node:ident[$src_port:expr]) => {
+        $builder.build_assignment(
+            $dst_node.value.borrow().get($dst_port),
+            $src_node.value.borrow().get($src_port),
+            calyx_ir::Guard::True)
+    };
+
+    // Guarded assignment.
+    (@base $builder:expr;
+     $dst_node:ident[$dst_port:expr] =
+        $guard:ident ?
+        $src_node:ident[$src_port:expr]) => {
+        $builder.build_assignment(
+            $dst_node.value.borrow().get($dst_port),
+            $src_node.value.borrow().get($src_port),
+            $guard.clone())
+    };
+
+    ($builder:expr;
+     $($dst_node:ident[$dst_port:expr] =
+         $($guard:ident)? ?
+         $src_node:ident[$src_port:expr];)*)  => {
+        [$(
+            build_assignments_2_aux!(@base $builder;
+                $dst_node[$dst_port] = $($guard)? ? $src_node[$src_port])
+        ),*]
+
+    };
+}
+
+/// Behaves like [`calyx_ir::build_assignments!`] but takes in a
+/// [`CalyxComponent`] instead of a [`calyx_ir::Builder`] and uses
+/// [`CalyxCell`]s instead of `RRC<calyx_ir::Cell>`s.
+#[macro_export(local_inner_macros)]
+macro_rules! build_assignments_2 {
+    ($component:expr; $($args:tt)*) => {
+        $component.with_calyx_builder(|builder| {
+            build_assignments_2_aux!(builder; $($args)*)
+        })
+    }
+}