.gitignore

@@ -0,0 +1,2 @@
+*.wasm
+*.wat

Makefile

@@ -1,5 +1,5 @@
 %.wat: %.py compile.py
-	python3.8 compile.py $< > $@
+	python3.8 compile.py $< $@
 
 %.wasm: %.wat
 	wat2wasm $^ -o $@

README.md

@@ -0,0 +1,4 @@
+webasm (python)
+===============
+
+You will need wat2wasm from github.com/WebAssembly/wabt in your path.

compile.py

@@ -52,6 +52,28 @@ class Visitor(ast.NodeVisitor):
             ))
 
     def visit_FunctionDef(self, node):
+        if node.decorator_list:
+            # TODO: Support normal decorators
+            assert 1 == len(node.decorator_list)
+            call = node.decorator_list[0]
+            assert 'external' == call.func.id
+            assert 1 == len(call.args)
+            assert isinstance(call.args[0].value, str)
+
+            import_ = Import(
+                call.args[0].value,
+                node.name,
+                node.name,
+            )
+
+            import_.params = [
+                arg.annotation.id
+                for arg in node.args.args
+            ]
+
+            self.imports.append(import_)
+            return
+
         func = Function(
             node.name,
         )
@@ -116,7 +138,7 @@ class Visitor(ast.NodeVisitor):
 def err(msg: str) -> None:
     sys.stderr.write('{}\n'.format(msg))
 
-def main(source: str) -> int:
+def main(source: str, sink: str) -> int:
     with open(source, 'r') as fil:
         code = fil.read()
 
@@ -125,7 +147,8 @@ def main(source: str) -> int:
     visitor = Visitor()
     visitor.visit(res)
 
-    print(visitor.generate())
+    with open(sink, 'w') as fil:
+        fil.write(visitor.generate())
 
     return 0
 

log.py

@@ -1,5 +1,6 @@
-from console import log as log
+@external('console')
-"log(i32)"
+def log(msg: i32) -> None:
+    ...
 
 def logIt():
     log(13 + 13 * 123)