1 files changed, 34 insertions, 10 deletions
diff --git a/neb/__init__.py b/neb/__init__.py
index 42e1d00..e3167b9 100644
--- a/neb/__init__.py
+++ b/neb/__init__.py
@@ -12,7 +12,7 @@ def interpret(exprs, env, ns=None):
     return ret
 
 def evaluate(expr, env, ns=None):
-    if isinstance(expr, Literal) or isinstance(expr, Function) or isinstance(expr, TypeWrap) or isinstance(expr, List) or isinstance(expr, Handle):
+    if isinstance(expr, Literal) or isinstance(expr, Callable) or isinstance(expr, TypeWrap) or isinstance(expr, List) or isinstance(expr, Handle):
         return expr
     elif isinstance(expr, Symbol) or isinstance(expr, Type):
         if env.contains(expr.name):
@@ -51,7 +51,8 @@ def evaluate(expr, env, ns=None):
     else:
         raise InterpretPanic(expr.args[0], "unable to evaluate")
 
-class Function:
+
+class Callable:
 
     def __init__(self, name, params, body, args=None, many=None):
         self.name = name
@@ -84,7 +85,35 @@ class Function:
             raise InterpretPanic(symbol, f"expected [{fmt}] arguments, received {len(params)}")
         return True
 
-    def evaluate_args(self, symbol, params, env, ns):
+    def call(self, expr, env):
+        pass
+
+class Special(Callable):
+
+    def __init__(self, name, params, body, args=None, many=None):
+        super().__init__(name, params, body, args, many)
+
+class NebSyntax(Special):
+
+    def __init__(self, name, callable_, args=None, many=None, return_type=None):
+        super().__init__(name, None, callable_, args, many)
+        if return_type is not None:
+            self.return_type = return_type
+
+    def __str__(self):
+        return f"syntax function {self.name}"
+
+    def call(self, expr, env, ns):
+        self.arity_check(expr.args[0], expr.args[1:])
+        return self.body(expr.args[0], expr.args[1:], env, ns)
+
+
+class Function(Callable):
+
+    def __init__(self, name, params, body, args=None, many=None):
+        super().__init__(name, params, body, args, many)
+
+    def precall(self, symbol, params, env, ns):
         ret = []
 
         for idx, param in enumerate(params):
@@ -92,9 +121,6 @@ class Function:
                 arg = self.args[idx]
             else:
                 arg = self.many
-            if arg.lazy:
-                ret.append(param)
-                continue
             ev = evaluate(param, env, ns)
             expected_type = evaluate(arg.type_, env, ns)
             valid = expected_type.validate_type(ev, env, ns)
@@ -105,8 +131,6 @@ class Function:
             ret.append(ev)
         return ret
 
-    def call(self, expr, env):
-        pass
 
 class Builtin(Function):
     
@@ -120,7 +144,7 @@ class Builtin(Function):
 
     def call(self, expr, env, ns):
         self.arity_check(expr.args[0], expr.args[1:])
-        evaluated_args = self.evaluate_args(expr.args[0], expr.args[1:], env, ns)
+        evaluated_args = self.precall(expr.args[0], expr.args[1:], env, ns)
         return self.body(expr.args[0], evaluated_args, env, ns)
 
 
@@ -172,7 +196,7 @@ class UserFunction(Function):
 
     def call(self, expr, env, ns):
         self.arity_check(expr.args[0], expr.args[1:])
-        evaluated_args = self.evaluate_args(expr.args[0], expr.args[1:], env, ns)
+        evaluated_args = self.precall(expr.args[0], expr.args[1:], env, ns)
         this_env = Environment(env)
         for idx, param in enumerate(self.params):
             this_env.register(param.name, evaluated_args[idx])