[ds] Allow variable deletion via rem

Author: iiPythonx

main.xpp

@@ -0,0 +1,13 @@
+jmp run
+
+:woah a b c
+    prt "Hello, world!"
+    prt a b c
+    ret b
+
+:run
+    prt "Hi. How are you?"
+    jmp woah 1 2 3 ?response
+    prt response "should be 2"
+    rem response
+    prt response "should be None"

xpp/core/datastore.py

@@ -21,7 +21,7 @@ def __init__(self, **kwargs) -> None:
 # Datastore class
 class Datastore(object):
     def __init__(self, mem: Memory, raw: str) -> None:
-        self.mem, self.raw = mem, raw
+        self.mem, self.raw, self.id_ = mem, raw, raw.lstrip("@?")
 
         # Handle variables
         last_stack = self.mem.interpreter.stack[-1]
@@ -62,11 +62,15 @@ def _parse(self) -> Any:
             return int(self.raw)
 
         # Handle variable
-        return self.store.get(self.raw.lstrip("@"))
+        return self.store.get(self.id_)
 
     def set(self, value: Any) -> None:
-        self.store[self.raw.lstrip("@")] = value
+        self.store[self.id_] = value
         self.value = value
 
+    def delete(self) -> None:
+        if self.id_ in self.store:
+            del self.store[self.id_]
+
     def refresh(self) -> None:
         self.value = self._parse()

xpp/modules/ops/stdlib/implib.py renamed to xpp/modules/ops/stdlib/internal.py

@@ -83,3 +83,6 @@ def ret(ctx) -> None:
         section.active = False  # Make it return next line tick
         if ctx.args:
             section.return_value = [a.value for a in ctx.args]
+
+    def rem(ctx) -> None:
+        [arg.delete() for arg in ctx.args]