type_checkers: encode

Author: krishpranav

src/type_checkers/encode.cr

@@ -0,0 +1,56 @@
+# -----------------------------------------------------------------------
+# 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::Encode) : Checkable
+      expression =
+        case item = node.expression
+        when Ast::Record
+          resolve item, true
+        else
+          resolve item
+        end
+
+      error! :encode_complex_type do
+        snippet "This type cannot be automatically encoded:", expression
+
+        block do
+          text "Only these types and records containing them can"
+          text "be automatically decoded:"
+        end
+
+        snippet <<-MOON
+          Map(String, a)
+          Array(a)
+          Maybe(a)
+          String
+          Number
+          Object
+          Time
+          Bool
+        MOON
+
+        snippet "The encode in question is here:", node
+      end unless check_decode(expression)
+
+      OBJECT
+    end
+  end
+end