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104 lines
3.1 KiB
104 lines
3.1 KiB
from __future__ import absolute_import
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# Copyright (c) 2010-2015 openpyxl
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"""Implements the lxml.etree.xmlfile API using the standard library xml.etree"""
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from contextlib import contextmanager
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from xml.etree.ElementTree import Element, tostring
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class LxmlSyntaxError(Exception):
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pass
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class _FakeIncrementalFileWriter(object):
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"""Replacement for _IncrementalFileWriter of lxml.
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Uses ElementTree to build xml in memory."""
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def __init__(self, output_file):
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self._element_stack = []
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self._top_element = None
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self._file = output_file
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self._have_root = False
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@contextmanager
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def element(self, tag, attrib=None, nsmap=None, **_extra):
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"""Create a new xml element using a context manager.
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The elements are written when the top level context is left.
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This is for code compatibility only as it is quite slow.
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"""
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# __enter__ part
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self._have_root = True
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if attrib is None:
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attrib = {}
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self._top_element = Element(tag, attrib=attrib, **_extra)
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self._top_element.text = ''
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self._top_element.tail = ''
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self._element_stack.append(self._top_element)
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yield
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# __exit__ part
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el = self._element_stack.pop()
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if self._element_stack:
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parent = self._element_stack[-1]
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parent.append(self._top_element)
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self._top_element = parent
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else:
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self._write_element(el)
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self._top_element = None
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def write(self, arg):
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"""Write a string or subelement."""
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if isinstance(arg, str):
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# it is not allowed to write a string outside of an element
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if self._top_element is None:
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raise LxmlSyntaxError()
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if len(self._top_element) == 0:
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# element has no children: add string to text
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self._top_element.text += arg
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else:
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# element has children: add string to tail of last child
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self._top_element[-1].tail += arg
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else:
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if self._top_element is not None:
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self._top_element.append(arg)
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elif not self._have_root:
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self._write_element(arg)
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else:
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raise LxmlSyntaxError()
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def _write_element(self, element):
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xml = tostring(element)
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self._file.write(xml)
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def __enter__(self):
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pass
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def __exit__(self, type, value, traceback):
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# without root the xml document is incomplete
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if not self._have_root:
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raise LxmlSyntaxError()
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class xmlfile(object):
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"""Context manager that can replace lxml.etree.xmlfile."""
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def __init__(self, output_file, buffered=False, encoding=None, close=False):
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if isinstance(output_file, str):
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self._file = open(output_file, 'wb')
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self._close = True
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else:
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self._file = output_file
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self._close = close
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def __enter__(self):
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return _FakeIncrementalFileWriter(self._file)
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def __exit__(self, type, value, traceback):
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if self._close == True:
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self._file.close()
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