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86 lines
2.5 KiB
Python
86 lines
2.5 KiB
Python
# pipeline.py
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#
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# Copyright 2021 James Westman <james@jwestman.net>
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#
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# This file is free software; you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as
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# published by the Free Software Foundation; either version 3 of the
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# License, or (at your option) any later version.
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#
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# This file is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# SPDX-License-Identifier: LGPL-3.0-or-later
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from . import ast, parser, tokenizer, xml_emitter
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class Pipeline:
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""" Represents the pipeline from blueprint code to XML, through the
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tokenizer and abstract syntax tree steps. Setting any step
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automatically updates the later steps. """
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def __init__(self, string=None):
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self._string = string
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self._tokens = None
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self._ast = None
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self._xml = None
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@property
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def string(self) -> str:
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""" Blueprint code """
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return self._string
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@string.setter
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def string(self, new_val):
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self._reset()
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self._string = new_val
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@property
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def tokens(self) -> [tokenizer.Token]:
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""" List of tokens """
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if self._tokens is None:
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if self.string is not None:
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self._tokens = tokenizer.tokenize(self._string)
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return self._tokens
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@tokens.setter
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def tokens(self, new_val):
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self._reset()
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self._tokens = new_val
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@property
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def ast(self) -> ast.UI:
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""" Abstract syntax tree """
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if self._ast is None:
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if self.tokens is not None:
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self._ast = parser.parse_ast(self.tokens)
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return self._ast
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@ast.setter
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def ast(self, new_val):
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self._reset()
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self._ast = new_val
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@property
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def xml(self) -> str:
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""" GtkBuilder XML string """
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if self._xml is None:
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if self.ast is not None:
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emitter = xml_emitter.XmlEmitter()
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self.ast.generate(emitter)
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self._xml = emitter.result
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return self._xml
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@xml.setter
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def xml(self, new_val):
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self._reset()
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self._xml = new_val
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def _reset(self):
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self._string = None
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self._tokens = None
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