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