mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-12-22 14:47:06 +00:00
98 lines
2.9 KiB
Python
Executable file
98 lines
2.9 KiB
Python
Executable file
#! /usr/bin/env nix-shell
|
||
#! nix-shell -I nixpkgs=channel:nixos-unstable -i python3 -p python3 -p python3.pkgs.lxml
|
||
|
||
"""
|
||
Pandoc will strip any markup within code elements so
|
||
let’s escape them so that they can be handled manually.
|
||
"""
|
||
|
||
import lxml.etree as ET
|
||
import re
|
||
import sys
|
||
|
||
def replace_element_by_text(el: ET.Element, text: str) -> None:
|
||
"""
|
||
Author: bernulf
|
||
Source: https://stackoverflow.com/a/10520552/160386
|
||
SPDX-License-Identifier: CC-BY-SA-3.0
|
||
"""
|
||
text = text + (el.tail or "")
|
||
parent = el.getparent()
|
||
if parent is not None:
|
||
previous = el.getprevious()
|
||
if previous is not None:
|
||
previous.tail = (previous.tail or "") + text
|
||
else:
|
||
parent.text = (parent.text or "") + text
|
||
parent.remove(el)
|
||
|
||
DOCBOOK_NS = "http://docbook.org/ns/docbook"
|
||
|
||
# List of elements that pandoc’s DocBook reader strips markup from.
|
||
# https://github.com/jgm/pandoc/blob/master/src/Text/Pandoc/Readers/DocBook.hs
|
||
code_elements = [
|
||
# CodeBlock
|
||
"literallayout",
|
||
"screen",
|
||
"programlisting",
|
||
# Code (inline)
|
||
"classname",
|
||
"code",
|
||
"filename",
|
||
"envar",
|
||
"literal",
|
||
"computeroutput",
|
||
"prompt",
|
||
"parameter",
|
||
"option",
|
||
"markup",
|
||
"wordasword",
|
||
"command",
|
||
"varname",
|
||
"function",
|
||
"type",
|
||
"symbol",
|
||
"constant",
|
||
"userinput",
|
||
"systemitem",
|
||
]
|
||
|
||
XMLNS_REGEX = re.compile(r'\s+xmlns(?::[^=]+)?="[^"]*"')
|
||
ROOT_ELEMENT_REGEX = re.compile(r'^\s*<[^>]+>')
|
||
|
||
def remove_xmlns(match: re.Match) -> str:
|
||
"""
|
||
Removes xmlns attributes.
|
||
|
||
Expects a match containing an opening tag.
|
||
"""
|
||
return XMLNS_REGEX.sub('', match.group(0))
|
||
|
||
if __name__ == '__main__':
|
||
assert len(sys.argv) >= 3, "usage: escape-code-markup.py <input> <output>"
|
||
|
||
tree = ET.parse(sys.argv[1])
|
||
name_predicate = " or ".join([f"local-name()='{el}'" for el in code_elements])
|
||
|
||
for markup in tree.xpath(f"//*[({name_predicate}) and namespace-uri()='{DOCBOOK_NS}']/*"):
|
||
text = ET.tostring(markup, encoding=str)
|
||
|
||
# tostring adds xmlns attributes to the element we want to stringify
|
||
# as if it was supposed to be usable standalone.
|
||
# We are just converting it to CDATA so we do not care.
|
||
# Let’s strip the namespace declarations to keep the code clean.
|
||
#
|
||
# Note that this removes even namespaces that were potentially
|
||
# in the original file. Though, that should be very rare –
|
||
# most of the time, we will stringify empty DocBook elements
|
||
# like <xref> or <co> or, at worst, <link> with xlink:href attribute.
|
||
#
|
||
# Also note that the regex expects the root element to be first
|
||
# thing in the string. But that should be fine, the tostring method
|
||
# does not produce XML declaration or doctype by default.
|
||
text = ROOT_ELEMENT_REGEX.sub(remove_xmlns, text)
|
||
|
||
replace_element_by_text(markup, text)
|
||
|
||
tree.write(sys.argv[2])
|