Fix variadic arguments bug

core/builtin_funcs.py

@@ -66,7 +66,11 @@ def execute(self, args: list[Value], kwargs: dict[str, Value]) -> RTResult[Value
         else:
             method = self.func
 
-        res.register(self.check_and_populate_args(method.arg_names, args, kwargs, method.defaults, exec_ctx))
+        res.register(
+            self.check_and_populate_args(
+                method.arg_names, args, kwargs, method.defaults, len(method.arg_names), exec_ctx
+            )
+        )
         if res.should_return():
             return res
 

core/datatypes.py

@@ -1051,12 +1051,17 @@ def generate_new_context(self) -> Context:
         return new_context
 
     def check_args(
-        self, arg_names: list[str], args: list[Value], kwargs: dict[str, Value], defaults: list[Optional[Value]]
+        self,
+        arg_names: list[str],
+        args: list[Value],
+        kwargs: dict[str, Value],
+        defaults: list[Optional[Value]],
+        max_pos_args: int,
     ) -> RTResult[None]:
         res = RTResult[None]()
 
         args_count = len(args) + len(kwargs)
-        if self.va_name is None and args_count > len(arg_names):
+        if self.va_name is None and (args_count > len(arg_names) or len(args) > max_pos_args):
             return res.failure(
                 RTError(
                     self.pos_start,
@@ -1090,18 +1095,24 @@ def check_args(
 
         return res.success(None)
 
-    def populate_args(self, arg_names, args, kwargs, defaults, exec_ctx):
+    def populate_args(self, arg_names, args, kwargs, defaults, max_pos_args, exec_ctx):
+        for i, (arg_name, default) in enumerate(zip(arg_names, defaults)):
+            if default is not None:
+                exec_ctx.symbol_table.set(arg_name, default)
+
+        populated = 0
         for i in range(len(arg_names)):
             arg_name = arg_names[i]
-            if arg_name in kwargs:
+            if i >= max_pos_args or arg_name in kwargs or i >= len(args):
                 continue
-            arg_value = defaults[i] if i >= len(args) else args[i]
+            arg_value = args[i]
             arg_value.set_context(exec_ctx)
             exec_ctx.symbol_table.set(arg_name, arg_value)
+            populated += 1
 
         if self.va_name is not None:
             va_list = []
-            for i in range(len(arg_names), len(args)):
+            for i in range(populated, len(args)):
                 arg = args[i]
                 arg.set_context(exec_ctx)
                 va_list.append(arg)
@@ -1111,12 +1122,12 @@ def populate_args(self, arg_names, args, kwargs, defaults, exec_ctx):
             kwarg.set_context(exec_ctx)
             exec_ctx.symbol_table.set(kw, kwarg)
 
-    def check_and_populate_args(self, arg_names, args, kwargs, defaults, exec_ctx):
+    def check_and_populate_args(self, arg_names, args, kwargs, defaults, max_pos_args, exec_ctx):
         res = RTResult()
-        res.register(self.check_args(arg_names, args, kwargs, defaults))
+        res.register(self.check_args(arg_names, args, kwargs, defaults, max_pos_args))
         if res.should_return():
             return res
-        self.populate_args(arg_names, args, kwargs, defaults, exec_ctx)
+        self.populate_args(arg_names, args, kwargs, defaults, max_pos_args, exec_ctx)
         return res.success(None)
 
 
@@ -1359,6 +1370,7 @@ class Function(BaseFunction):
     arg_names: list[str]
     defaults: list[Optional[Value]]
     should_auto_return: bool
+    max_pos_args: int
 
     def __help_repr__(self) -> str:
         return f"Help on function {self.name}:\n\n{self.__help_repr_method__()}"
@@ -1382,6 +1394,7 @@ def __init__(
         should_auto_return: bool,
         desc: str,
         va_name: Optional[str],
+        max_pos_args: int,
     ) -> None:
         super().__init__(name, symbol_table)
         self.body_node = body_node
@@ -1390,6 +1403,7 @@ def __init__(
         self.should_auto_return = should_auto_return
         self.desc = desc
         self.va_name = va_name
+        self.max_pos_args = max_pos_args
 
     def execute(self, args: list[Value], kwargs: dict[str, Value]) -> RTResult[Value]:
         from core.interpreter import Interpreter  # Lazy import
@@ -1398,7 +1412,9 @@ def execute(self, args: list[Value], kwargs: dict[str, Value]) -> RTResult[Value
         interpreter = Interpreter()
         exec_ctx = self.generate_new_context()
 
-        res.register(self.check_and_populate_args(self.arg_names, args, kwargs, self.defaults, exec_ctx))
+        res.register(
+            self.check_and_populate_args(self.arg_names, args, kwargs, self.defaults, self.max_pos_args, exec_ctx)
+        )
         if res.should_return():
             return res
 
@@ -1424,6 +1440,7 @@ def copy(self) -> Function:
             self.should_auto_return,
             self.desc,
             self.va_name,
+            self.max_pos_args,
         )
         copy.set_context(self.context)
         copy.set_pos(self.pos_start, self.pos_end)

core/interpreter.py

@@ -517,6 +517,7 @@ def visit_FuncDefNode(self, node: FuncDefNode, context: Context) -> RTResult[Val
                 node.should_auto_return,
                 func_desc,
                 va_name=node.va_name,
+                max_pos_args=node.max_pos_args,
             )
             .set_context(context)
             .set_pos(node.pos_start, node.pos_end)

core/nodes.py

@@ -239,6 +239,7 @@ class FuncDefNode:
     static: bool
     desc: str
     va_name: Optional[str]
+    max_pos_args: int
 
     pos_start: Position
     pos_end: Position

core/parser.py

@@ -568,8 +568,14 @@ def call(self) -> ParseResult[Node]:
                         return res
                     assert pair is not None
                     kw, val = pair
-                    if kw is None:
+                    if kw is None and len(kwarg_nodes) == 0:
                         arg_nodes.append(val)
+                    elif kw is None:
+                        return res.failure(
+                            InvalidSyntaxError(
+                                val.pos_start, val.pos_end, "Positional arguments may not come after keyword arguments"
+                            )
+                        )
                     else:
                         kwarg_nodes[kw] = val
 
@@ -1233,6 +1239,7 @@ def func_def(self) -> ParseResult[Node]:
         defaults: list[Optional[Node]] = []
         has_optionals = False
         is_va = False
+        max_pos_args = 0
         va_name: Optional[str] = None
 
         if self.current_tok.type == TT_SPREAD:
@@ -1248,6 +1255,8 @@ def func_def(self) -> ParseResult[Node]:
             self.advance(res)
             if not is_va:
                 arg_name_toks.append(arg_name_tok)
+                if va_name is None:
+                    max_pos_args += 1
 
             if is_va:
                 va_name = arg_name_tok.value
@@ -1284,6 +1293,9 @@ def func_def(self) -> ParseResult[Node]:
                 assert isinstance(arg_name_tok.value, str)
                 if not is_va:
                     arg_name_toks.append(arg_name_tok)
+                    if va_name is None:
+                        max_pos_args += 1
+
                 self.advance(res)
 
                 if is_va:
@@ -1335,6 +1347,7 @@ def func_def(self) -> ParseResult[Node]:
                     static=static,
                     desc="[No Description]",
                     va_name=va_name,
+                    max_pos_args=max_pos_args,
                     pos_start=node_pos_start,
                     pos_end=self.current_tok.pos_end,
                 )
@@ -1375,6 +1388,7 @@ def func_def(self) -> ParseResult[Node]:
                 static=static,
                 desc=desc,
                 va_name=va_name,
+                max_pos_args=max_pos_args,
                 pos_start=node_pos_start,
                 pos_end=self.current_tok.pos_end,
             )

core/tokens.py

@@ -41,7 +41,7 @@ class Position:
     ftxt: str
 
     def __str__(self) -> str:
-        return f"{self.fn}:{self.ln}:{self.col}"
+        return f"{self.fn}:{self.ln+1}:{self.col+1}"
 
     def advance(self, current_char: Optional[str] = None) -> Position:
         self.idx += 1

tests/va_bug.rn

@@ -0,0 +1,5 @@
+fun f(...args, kw=null) -> print(kw)
+
+f(1, 2, 3)
+f(1, 2, 3, kw=4)
+

tests/va_bug.rn.json

@@ -0,0 +1 @@
+{"code": 0, "stdout": "null\n4\n", "stderr": ""}