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80 lines
2.4 KiB
Python
80 lines
2.4 KiB
Python
from typing import TYPE_CHECKING, Optional
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from ...encoding import UTF8
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from ...plugins import FormatterPlugin
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if TYPE_CHECKING:
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from xml.dom.minidom import Document
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XML_DECLARATION_OPEN = '<?xml'
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XML_DECLARATION_CLOSE = '?>'
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def parse_xml(data: str) -> 'Document':
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"""Parse given XML `data` string into an appropriate :class:`~xml.dom.minidom.Document` object."""
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from defusedxml.minidom import parseString
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return parseString(data)
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def parse_declaration(raw_body: str) -> Optional[str]:
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body = raw_body.strip()
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# XMLDecl ::= '<?xml' DECL_CONTENT '?>'
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if body.startswith(XML_DECLARATION_OPEN):
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end = body.find(XML_DECLARATION_CLOSE)
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if end != -1:
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return body[:end + len(XML_DECLARATION_CLOSE)]
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def pretty_xml(document: 'Document',
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declaration: Optional[str] = None,
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encoding: Optional[str] = UTF8,
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indent: int = 2) -> str:
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"""Render the given :class:`~xml.dom.minidom.Document` `document` into a prettified string."""
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kwargs = {
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'encoding': encoding or UTF8,
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'indent': ' ' * indent,
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}
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body = document.toprettyxml(**kwargs).decode(kwargs['encoding'])
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# Remove blank lines automatically added by `toprettyxml()`.
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lines = [line for line in body.splitlines() if line.strip()]
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# xml.dom automatically adds the declaration, even if
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# it is not present in the actual body. Remove it.
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if len(lines) >= 1 and parse_declaration(lines[0]):
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lines.pop(0)
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if declaration:
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lines.insert(0, declaration)
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return '\n'.join(lines)
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class XMLFormatter(FormatterPlugin):
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def __init__(self, **kwargs):
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super().__init__(**kwargs)
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self.enabled = self.format_options['xml']['format']
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def format_body(self, body: str, mime: str):
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if 'xml' not in mime:
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return body
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from xml.parsers.expat import ExpatError
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from defusedxml.common import DefusedXmlException
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declaration = parse_declaration(body)
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try:
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parsed_body = parse_xml(body)
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except ExpatError:
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pass # Invalid XML, ignore.
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except DefusedXmlException:
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pass # Unsafe XML, ignore.
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else:
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body = pretty_xml(parsed_body,
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encoding=parsed_body.encoding,
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indent=self.format_options['xml']['indent'],
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declaration=declaration)
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return body
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