Initial commit

gtkblueprinttool/pipeline.py

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+# pipeline.py
+#
+# Copyright 2021 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 . import ast, parser, tokenizer, xml_emitter
+
+
+class Pipeline:
+    """ Represents the pipeline from blueprint code to XML, through the
+        tokenizer and abstract syntax tree steps. Setting any step
+        automatically updates the later steps. """
+
+    def __init__(self, string=None):
+        self._string = string
+        self._tokens = None
+        self._ast = None
+        self._xml = None
+
+    @property
+    def string(self) -> str:
+        """ Blueprint code """
+        return self._string
+    @string.setter
+    def string(self, new_val):
+        self._reset()
+        self._string = new_val
+
+    @property
+    def tokens(self) -> [tokenizer.Token]:
+        """ List of tokens """
+        if self._tokens is None:
+            if self.string is not None:
+                self._tokens = tokenizer.tokenize(self._string)
+        return self._tokens
+    @tokens.setter
+    def tokens(self, new_val):
+        self._reset()
+        self._tokens = new_val
+
+    @property
+    def ast(self) -> ast.UI:
+        """ Abstract syntax tree """
+        if self._ast is None:
+            if self.tokens is not None:
+                self._ast = parser.parse_ast(self.tokens)
+        return self._ast
+    @ast.setter
+    def ast(self, new_val):
+        self._reset()
+        self._ast = new_val
+
+    @property
+    def xml(self) -> str:
+        """ GtkBuilder XML string """
+        if self._xml is None:
+            if self.ast is not None:
+                emitter = xml_emitter.XmlEmitter()
+                self.ast.generate(emitter)
+                self._xml = emitter.result
+        return self._xml
+    @xml.setter
+    def xml(self, new_val):
+        self._reset()
+        self._xml = new_val
+
+
+    def _reset(self):
+        self._string = None
+        self._tokens = None
+