Refact internal error

Moved to the right place.
Also add some more typing.

Author: boriel

src/api/errors.py

@@ -18,7 +18,8 @@
     'InvalidLoopError',
     'InvalidCONSTexpr',
     'InvalidBuiltinFunctionError',
-    'InternalError'
+    'InternalError',
+    'TempAlreadyFreedError'
 ]
 
 
@@ -52,6 +53,14 @@ def __init__(self, fname):
         self.msg = "Invalid BUILTIN function '%s'" % fname
 
 
-class InternalError:
+class InternalError(Error):
     def __init__(self, msg):
         self.msg = msg
+
+
+class TempAlreadyFreedError(InternalError):
+    """ Raised when a TEMP label has been already freed.
+    """
+    def __init__(self, label):
+        super().__init__(f"Label '{label}' already freed")
+        self.label = label

src/arch/zx48k/backend/__common.py

@@ -3,7 +3,12 @@
 # vim ts=4:et:sw=4:ai
 
 import math
-from .errors import TempAlreadyFreedError
+
+from typing import List
+from typing import Set
+
+import src.api.errors
+
 
 MEMORY = []  # Must be initialized by with init()
 
@@ -12,19 +17,19 @@
 
 # Counter for generated tmp labels (__TMP0, __TMP1, __TMPN)
 TMP_COUNTER = 0
-TMP_STORAGES = []
+TMP_STORAGES: List[str] = []
 
 # Set containing REQUIRED libraries
-REQUIRES = set()  # Set of required libraries (included once)
+REQUIRES: Set[str] = set()  # Set of required libraries (included once)
 
 # Set containing automatic on start called routines
-INITS = set()  # Set of INIT routines
+INITS: Set[str] = set()  # Set of INIT routines
 
 # CONSTANT LN(2)
 __LN2 = math.log(2)
 
 # GENERATED labels __LABELXX
-TMP_LABELS = set()
+TMP_LABELS: Set[str] = set()
 
 
 def init():
@@ -83,9 +88,9 @@ def tmp_temp() -> str:
     return result
 
 
-def tmp_remove(label):
+def tmp_remove(label: str):
     if label not in TMP_STORAGES:
-        raise TempAlreadyFreedError(label)
+        raise src.api.errors.TempAlreadyFreedError(label)
 
     TMP_STORAGES.pop(TMP_STORAGES.index(label))
 

src/arch/zx48k/backend/errors.py

@@ -7,8 +7,7 @@
 __all__ = ['GenericError',
            'InvalidICError',
            'NoMoreRegistersError',
-           'UnsupportedError',
-           'TempAlreadyFreedError']
+           'UnsupportedError']
 
 
 class GenericError(Error):
@@ -52,14 +51,6 @@ def __init__(self, feat):
         self.feature = feat
 
 
-class TempAlreadyFreedError(GenericError):
-    """ Raised when a TEMP label has been already freed.
-    """
-    def __init__(self, label):
-        GenericError.__init__(self, "Label '%s' already freed" % label)
-        self.label = label
-
-
 # -----------------------------------------------------------------------------
 #  Functions for throwing errors
 # -----------------------------------------------------------------------------