type_checkers: emit

Author: krishpranav

src/type_checkers/emit.cr

@@ -0,0 +1,43 @@
+# -----------------------------------------------------------------------
+# This file is part of MoonScript
+#
+# MoonSript is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# MoonSript is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with MoonSript.  If not, see <https://www.gnu.org/licenses/>.
+#
+# Copyright (C) 2025 Krisna Pranav, MoonScript Developers
+# -----------------------------------------------------------------------
+
+module MoonScript
+    class TypeChecker
+      def check(node : Ast::Emit) : Checkable
+        error! :emit_no_signal do
+          snippet "Emit cannot be used outside of signals:", node
+        end unless signal = node.signal
+  
+        type =
+          resolve node.expression
+  
+        signal_type =
+          resolve signal.type
+  
+        error! :emit_type_mismatch do
+          snippet "The emitted values type is different from the signals type:",
+            signal_type
+  
+          snippet "The type of the emitted value is:", type
+        end unless Comparer.compare(type, signal_type)
+  
+        VOID
+      end
+    end
+  end