Merge pull request #10 from Deekshith-M13/improve-error-system

Author: LiamWJH

.idea/.gitignore

@@ -1,22 +1,99 @@
 import os
-from colorama import Style, Back, Fore, init
-init()
+from colorama import Style, Fore, init
+init(autoreset=True)
+
+
+# Legacy error classes (old system)
+# Kept so old code does not break.
+
+
 class Syntaxerror:
     def __init__(self, msg):
         self.msg = msg
     def __repr__(self):
-        return Fore.RED + f'Syntax error  -> {self.msg}!' + Style.RESET_ALL
+        return Fore.RED + f'Syntax error -> {self.msg}!' + Style.RESET_ALL
+
 class Extensionerror:
     def __init__(self, filename, msg):
         self.filename = filename
         self.msg = msg
     def __repr__(self):
-        return Fore.RED + f'File extension error for file: {self.filename}, expected extension: ".bwt" -> {self.msg}!' + Style.RESET_ALL
+        return (
+            Fore.RED +
+            f'File extension error for: {self.filename}, expected .bwt -> {self.msg}!'
+            + Style.RESET_ALL
+        )
+
 class Miscerror:
     def __init__(self, msg):
         self.msg = msg
     def __repr__(self):
-        return Fore.RED + f'Misc error  -> {self.msg}!' + Style.RESET_ALL
+        return Fore.RED + f'Misc error -> {self.msg}!' + Style.RESET_ALL
+
+
+
+# New improved error system
+# Real Python exceptions with
+# optional line/column/token info.
+
+
+class StrollError(Exception):
+    def __init__(self, message, *, line=None, column=None, filename=None, token=None):
+        super().__init__(message)
+        self.message = message
+        self.line = line
+        self.column = column
+        self.filename = filename
+        self.token = token
+
+    def __str__(self):
+        text = Fore.RED + f"{self.__class__.__name__}: {self.message}"
+        # Show position info if available
+        if self.line is not None:
+            text += f" (line {self.line}"
+            if self.column is not None:
+                text += f", col {self.column}"
+            text += ")"
+        # Show token if available
+        if self.token:
+            text += f" [token: {self.token}]"
+        return text + Style.RESET_ALL
+
+    __repr__ = __str__
+
+
+# Simple subclasses so we can distinguish types of errors
+class SyntaxErrorStroll(StrollError): pass
+class ExtensionErrorStroll(StrollError): pass
+class MiscErrorStroll(StrollError): pass
+class NameErrorStroll(StrollError): pass
+class TypeErrorStroll(StrollError): pass
+class ArgumentErrorStroll(StrollError): pass
+class RuntimeErrorStroll(StrollError): pass
+
+
+
+# Helper to raise syntax errors
+# Parser/runtime can call this.
+
+
+def raise_syntax(message, token=None, *, filename=None):
+    line = getattr(token, "line", None)
+    col = getattr(token, "column", None)
+    val = getattr(token, "value", token)
+    raise SyntaxErrorStroll(
+        message,
+        line=line,
+        column=col,
+        filename=filename,
+        token=val
+    )
+
+
+# Old terminate() function
+# Still kept for compatibility.
+
+
 def terminate(token):
     print(Fore.YELLOW + f"On token: [ {token} ]" + Style.RESET_ALL)
-    os._exit(1)
+    os._exit(1)