reorganization: Finish moving parsing and AST

blueprintcompiler/language/attributes.py

@@ -0,0 +1,45 @@
+# attributes.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 .values import Value, TranslatedStringValue
+from .common import *
+
+
+class BaseAttribute(AstNode):
+    """ A helper class for attribute syntax of the form `name: literal_value;`"""
+
+    tag_name: str = ""
+    attr_name: str = "name"
+
+    def emit_xml(self, xml: XmlEmitter):
+        value = self.children[Value][0]
+        attrs = { self.attr_name: self.tokens["name"] }
+
+        if isinstance(value, TranslatedStringValue):
+            attrs = { **attrs, **value.attrs }
+
+        xml.start_tag(self.tag_name, **attrs)
+        value.emit_xml(xml)
+        xml.end_tag()
+
+
+class BaseTypedAttribute(BaseAttribute):
+    """ A BaseAttribute whose parent has a value_type property that can assist
+    in validation. """