type_checkers: comment

Author: krishpranav

src/type_checkers/case_branch.cr

@@ -0,0 +1,42 @@
+# -----------------------------------------------------------------------
+# 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::CaseBranch, condition : Checkable) : Checkable
+        type =
+          node.pattern.try do |item|
+            variables =
+              destructure(item, condition)
+  
+            variables.each do |var|
+              scope.add(node, var[0], var[2])
+            end
+  
+            resolve(node.expression)
+          end || resolve(node.expression)
+  
+        if node.expression.is_a?(Array(Ast::CssDefinition))
+          VOID
+        else
+          type.as(Checkable)
+        end
+      end
+    end
+end