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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 pathlib import Path
from lxml.builder import E
from lxml.etree import (CDATA, QName, Resolver, XML, XMLParser,
XSLT, XSLTExtension, tostring as serialize)
__all__ = ['NS', 'Processor', 'recurse']
NS = 'https://rub.parody'
GEN_OMNIFEED = '''<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes" encoding="UTF-8"/>
<xsl:template match="@*|node()">
<xsl:copy>
<xsl:apply-templates select="@*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="path">
<xsl:copy-of select="."/>
<xsl:copy-of select="document(.)"/>
</xsl:template>
</xsl:stylesheet>
'''
def serialize_content(element) -> str:
text = element.text.encode() if element.text else b''
children = b''.join(serialize(deepcopy(i)) for i in element)
return text + children
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)
class Serializer(XSLTExtension):
def execute(self, context, self_node, input_node, output_parent):
output_parent.text = CDATA(serialize_content(input_node))
class Processor:
"""Callable XSLT processor."""
def __init__(self, xslt: Path, change_name, **handlers) -> None:
self.xslt, self.change_name = xslt, change_name
stylesheet = xslt.read_bytes()
extensions = {(NS, 'eval'): Evaluator(**handlers),
(NS, 'serialize'): Serializer()}
self.transform = XSLT(XML(stylesheet), extensions=extensions)
def process(self, src: Path, dest: Path) -> None:
dest.parent.mkdir(mode=0o755, parents=True, exist_ok=True)
dest.write_text(str(self.transform(XML(src.read_bytes()))))
def gen_metadata(sources: list[Path], pages: list[Path],
out_dir: Path, dest: Path) -> None:
"""Extract metadata from all source pages."""
entries = []
for src, page in zip(sources, pages):
src_root = XML(src.read_bytes())
desc = src_root.findtext('description', '', {None: NS})
if not desc:
continue
title = src_root.findtext('title', '', {None: NS})
date = src_root.findtext('date', '', {None: NS})
categories = src_root.itertext(tag=QName(NS, 'category').text,
with_tail=False)
path = str(page.relative_to(out_dir))
entries.append(E.entry(E.title(title), E.description(desc),
E.date(date), *map(E.category, categories),
E.path(path)))
dest.parent.mkdir(mode=0o755, parents=True, exist_ok=True)
dest.write_bytes(serialize(E.feed(*entries), pretty_print=True))
class PageResolver(Resolver):
"""URI resolver for use in XSLT document function."""
def __init__(self, base: Path) -> None:
self.base = base
super().__init__()
def resolve(self, path, public_id, context):
return self.resolve_filename(str(self.base/path), context)
def gen_omnifeed(metadata: Path, out_dir: Path, dest: Path) -> None:
"""Generate generic global feed."""
parser = XMLParser()
parser.resolvers.add(PageResolver(out_dir))
transform = XSLT(XML(GEN_OMNIFEED, parser))
omnifeed = transform(XML(metadata.read_bytes()))
dest.parent.mkdir(mode=0o755, parents=True, exist_ok=True)
dest.write_bytes(serialize(omnifeed, pretty_print=True))
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