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# XML processing abstractions
# Copyright (C) 2023 Nguyễn Gia Phong
#
# This file is part of rub.
#
# Rub is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Rub 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with rub. If not, see <https://www.gnu.org/licenses/>.
from copy import deepcopy
from functools import partial
from pathlib import Path
from lxml.etree import QName, XML, XSLT, XSLTExtension
__all__ = ['NS', 'generator', 'recurse']
NS = 'https://rub.parody'
def recurse(extension, context, input_node, output_parent):
"""Apply template recursively on input node."""
output = deepcopy(input_node)
for i in output: output.remove(i)
for i in input_node:
for j in extension.apply_templates(context, i):
if not isinstance(j, str):
output.append(deepcopy(j))
elif len(output) == 0:
if output.text is None:
output.text = j
else:
output.text += j
elif output[-1].tail is None:
output[-1].tail = j
else:
output[-1].tail += j
output_parent.append(output)
class Evaluator(XSLTExtension):
def __init__(self, **handlers):
self.handlers = {QName(NS, k).text: v for k, v in handlers.items()}
super().__init__()
def execute(self, context, self_node, input_node, output_parent):
handle = self.handlers.get(input_node.tag, recurse)
handle(self, context, input_node, output_parent)
def generator(xslt, **handlers):
"""Return a function taking an XML file and apply given XSLT."""
stylesheet = xslt.read_bytes()
extensions = {(NS, 'eval'): Evaluator(**handlers)}
transform = XSLT(XML(stylesheet), extensions=extensions)
def make(src, dest):
dest.parent.mkdir(mode=0o755, parents=True, exist_ok=True)
dest.write_text(str(transform(XML(src.read_bytes()))))
return make
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