Adding error handling support

modules/Variables.py

@@ -1,5 +1,7 @@
 import sys
 
+from modules.errors import SPFUnknownVariable, SPFUninitializedVariable, SPFAlreadyDefined, SPFIncompatibleType, SPFIndexError
+
 trace_format = '\033[1m -> '
 reset_format = '\033[0m'
 
@@ -11,14 +13,16 @@ class Variables:
                   "booléen": bool,
                   "liste": list }
 
-        def __init__(self, typ, value = None):
+        def __init__(self, typ, value=None):
             assert typ in self.types.keys(), "Ce type de variable est inconnu"
             self.type = typ
-            assert self.checkType(value, typ), f"Le type n'est pas équivalent: { value } n'est pas {typ}"
-            self.value = value if (value is not None) else self.default(typ)
+            if not self.checkType(value, typ):
+                raise SPFIncompatibleType(value, self.type)
+            self.value = value
 
         def set(self, value):
-            assert self.checkType(value, self.type), f"Le type n'est pas équivalent: {value} n'est pas {self.type}"
+            if not self.checkType(value, self.type):
+                raise SPFIncompatibleType(value, self.type)
             self.value = value
 
         def __str__(self):
@@ -49,19 +53,24 @@ class Variables:
         self.trace = trace
 
     def get(self, name):
-        assert name in self.variables, f"la variable {name} n'éxiste pas"
+        if name not in self.variables:
+            raise SPFUnknownVariable(name)
+        if self.variables[name].value == None:
+            raise SPFUninitializedVariable(name)
         if self.trace:
             print(f"{trace_format}accède {name}{reset_format}", file=sys.stderr)
         return self.variables[name].value
 
     def declare(self, typ, name, value=None):
-        assert name not in self.variables, f"la variable {name} existe déjà"
+        if name in self.variables:
+            raise SPFAlreadyDefined(name)
         self.variables[name] = self.Variable(typ, value)
         if self.trace:
             print(f"{trace_format}déclare {name} = {value}{reset_format}", file=sys.stderr)
 
     def assign(self, name, value):
-        assert name in self.variables, f"la variable {name} n'éxiste pas"
+        if name not in self.variables:
+            raise SPFUnknownVariable(name)
         self.variables[name].set(value)
         if self.trace:
             print(f"{trace_format}modifie {name} = {value}{reset_format}", file=sys.stderr)

modules/errors.py

@@ -0,0 +1,44 @@
+# args
+# 0) variable name
+# 1) list of lines of the stack trace
+
+class SPFException(Exception):
+    def __init__(self, *args):
+        super().__init__(*args)
+        self.msg = "Une erreur est survenue"
+        self.errorline = None
+
+    def __str__(self):
+        return (f"[ligne {self.errorline}] " if self.errorline else "") + f"{self.msg}"
+
+class SPFSyntaxError(SPFException):
+    def __init__(self, *args):
+        super().__init__(*args)
+        self.msg = "Une erreur de syntaxe est survenue"
+
+class SPFUnknownVariable(SPFException):
+    def __init__(self, *args):
+        super().__init__(*args)
+        self.msg = f"la variable `{args[0]}` n'est pas déclarée"
+
+class SPFUninitializedVariable(SPFException):
+    def __init__(self, *args):
+        super().__init__(*args)
+        self.msg = f"la variable `{args[0]}` n'est pas initialisée"
+
+class SPFAlreadyDefined(SPFException):
+    def __init__(self, *args):
+        super().__init__(*args)
+        self.msg = f"la variable `{args[0]}` est déjà déclarée"
+
+class SPFIncompatibleType(SPFException):
+    def __init__(self, *args):
+        super().__init__(*args)
+        self.msg = f"`{args[0]}` n'est pas de type `{args[1]}`"
+
+class SPFIndexError(SPFException):
+    def __init__(self, *args):
+        super().__init__(*args)
+        self.msg = f"La liste `{args[0]}` ne posède pas d'élèment d'indexe {args[1]}"
+
+