From 461bfbbdc565b18b9027efe9f0dcaa61026d5b7d Mon Sep 17 00:00:00 2001
From: NikolajDanger <nikolaj@ingemanngade.net>
Date: Wed, 22 Apr 2026 14:09:01 +0200
Subject: [PATCH] :goat: INVOCA error message

---
 cent                | 2 ++
 centvrion/parser.py | 8 +++++++-
 tests.py            | 2 ++
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/cent b/cent
index 594e6a2..8371069 100755
--- a/cent
+++ b/cent
@@ -42,6 +42,8 @@ def main():
     pos = e.source_pos
     char = program_text[pos.idx] if pos.idx < len(program_text) else "?"
     sys.exit(f"CENTVRION error: Invalid character {char!r} at line {pos.lineno}, column {pos.colno}")
+  except SyntaxError as e:
+    sys.exit(f"CENTVRION error: {e}")
 
   if isinstance(program, Program):
     if args["-i"]:
diff --git a/centvrion/parser.py b/centvrion/parser.py
index b757ad3..dbc0dfd 100644
--- a/centvrion/parser.py
+++ b/centvrion/parser.py
@@ -408,7 +408,13 @@ class Parser():
 
     @self.pg.error
     def error_handle(token):
-      raise SyntaxError(f"{token.name}, {token.value}, {token.source_pos}")
+      pos = token.source_pos
+      loc = f" at line {pos.lineno}, column {pos.colno}" if pos else ""
+      if token.name == "SYMBOL_LPARENS":
+        raise SyntaxError(
+          f"Unexpected '('{loc}. To call a function, use INVOCA: INVOCA func (args)"
+        )
+      raise SyntaxError(f"Unexpected token '{token.value}'{loc}")
 
     parser = self.pg.build()
     return parser.parse(tokens_input) # type: ignore
diff --git a/tests.py b/tests.py
index b7a7fa1..897a44d 100644
--- a/tests.py
+++ b/tests.py
@@ -685,6 +685,8 @@ error_tests = [
   ("INVOCA f ()", CentvrionError),                          # undefined function
   ("DESIGNA VT III", SyntaxError),                          # parse error: missing id after DESIGNA
   ("DESIGNA x III", SyntaxError),                           # parse error: missing VT
+  ("DEFINI f () VT { REDI(I) }\nf()", SyntaxError),        # function call without INVOCA (no args)
+  ("DEFINI f (x) VT { REDI(x) }\nf(I)", SyntaxError),     # function call without INVOCA (with args)
   ("DIC(M + M + M + M)", CentvrionError),                  # output > 3999 without MAGNVM
   ("IIII", CentvrionError),                                 # invalid Roman numeral in source
   ("FORTVITVS_NVMERVS(I, X)", CentvrionError),                 # requires FORS module