Add lambda expressions

blueprintcompiler/language/lambdas.py

@@ -0,0 +1,53 @@
+# lambdas.py
+#
+# Copyright 2022 James Westman <james@jwestman.net>
+#
+# This file is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as
+# published by the Free Software Foundation; either version 3 of the
+# License, or (at your option) any later version.
+#
+# This file 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+# SPDX-License-Identifier: LGPL-3.0-or-later
+
+
+from .types import TypeName
+from .expression import Expr
+from .values import Value
+from .common import *
+
+
+class Lambda(Value, Scope):
+    grammar = [
+        "(",
+        TypeName,
+        UseIdent("argument"),
+        ")",
+        "=>",
+        Expr,
+    ]
+
+    def emit_xml(self, xml: XmlEmitter):
+        for child in self.children:
+            child.emit_xml(xml)
+
+    def get_objects(self):
+        return {
+            **self.parent.parent_by_type(Scope).get_objects(),
+            self.tokens["argument"]: None,
+        }
+
+    @property
+    def this_name(self) -> str:
+        return self.tokens["argument"]
+
+    @property
+    def this_type(self) -> str:
+        return self.children[TypeName][0].gir_type