509 lines
18 KiB
Python
509 lines
18 KiB
Python
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"""
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lxml-based doctest output comparison.
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Note: normally, you should just import the `lxml.usedoctest` and
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`lxml.html.usedoctest` modules from within a doctest, instead of this
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one::
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>>> import lxml.usedoctest # for XML output
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>>> import lxml.html.usedoctest # for HTML output
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To use this module directly, you must call ``lxmldoctest.install()``,
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which will cause doctest to use this in all subsequent calls.
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This changes the way output is checked and comparisons are made for
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XML or HTML-like content.
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XML or HTML content is noticed because the example starts with ``<``
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(it's HTML if it starts with ``<html``). You can also use the
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``PARSE_HTML`` and ``PARSE_XML`` flags to force parsing.
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Some rough wildcard-like things are allowed. Whitespace is generally
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ignored (except in attributes). In text (attributes and text in the
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body) you can use ``...`` as a wildcard. In an example it also
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matches any trailing tags in the element, though it does not match
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leading tags. You may create a tag ``<any>`` or include an ``any``
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attribute in the tag. An ``any`` tag matches any tag, while the
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attribute matches any and all attributes.
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When a match fails, the reformatted example and gotten text is
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displayed (indented), and a rough diff-like output is given. Anything
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marked with ``+`` is in the output but wasn't supposed to be, and
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similarly ``-`` means its in the example but wasn't in the output.
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You can disable parsing on one line with ``# doctest:+NOPARSE_MARKUP``
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"""
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from lxml import etree
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import sys
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import re
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import doctest
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try:
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from html import escape as html_escape
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except ImportError:
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from cgi import escape as html_escape
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__all__ = ['PARSE_HTML', 'PARSE_XML', 'NOPARSE_MARKUP', 'LXMLOutputChecker',
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'LHTMLOutputChecker', 'install', 'temp_install']
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try:
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_basestring = basestring
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except NameError:
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_basestring = (str, bytes)
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_IS_PYTHON_3 = sys.version_info[0] >= 3
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PARSE_HTML = doctest.register_optionflag('PARSE_HTML')
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PARSE_XML = doctest.register_optionflag('PARSE_XML')
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NOPARSE_MARKUP = doctest.register_optionflag('NOPARSE_MARKUP')
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OutputChecker = doctest.OutputChecker
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def strip(v):
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if v is None:
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return None
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else:
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return v.strip()
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def norm_whitespace(v):
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return _norm_whitespace_re.sub(' ', v)
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_html_parser = etree.HTMLParser(recover=False, remove_blank_text=True)
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def html_fromstring(html):
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return etree.fromstring(html, _html_parser)
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# We use this to distinguish repr()s from elements:
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_repr_re = re.compile(r'^<[^>]+ (at|object) ')
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_norm_whitespace_re = re.compile(r'[ \t\n][ \t\n]+')
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class LXMLOutputChecker(OutputChecker):
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empty_tags = (
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'param', 'img', 'area', 'br', 'basefont', 'input',
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'base', 'meta', 'link', 'col')
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def get_default_parser(self):
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return etree.XML
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def check_output(self, want, got, optionflags):
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alt_self = getattr(self, '_temp_override_self', None)
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if alt_self is not None:
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super_method = self._temp_call_super_check_output
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self = alt_self
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else:
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super_method = OutputChecker.check_output
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parser = self.get_parser(want, got, optionflags)
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if not parser:
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return super_method(
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self, want, got, optionflags)
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try:
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want_doc = parser(want)
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except etree.XMLSyntaxError:
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return False
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try:
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got_doc = parser(got)
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except etree.XMLSyntaxError:
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return False
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return self.compare_docs(want_doc, got_doc)
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def get_parser(self, want, got, optionflags):
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parser = None
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if NOPARSE_MARKUP & optionflags:
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return None
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if PARSE_HTML & optionflags:
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parser = html_fromstring
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elif PARSE_XML & optionflags:
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parser = etree.XML
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elif (want.strip().lower().startswith('<html')
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and got.strip().startswith('<html')):
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parser = html_fromstring
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elif (self._looks_like_markup(want)
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and self._looks_like_markup(got)):
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parser = self.get_default_parser()
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return parser
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def _looks_like_markup(self, s):
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s = s.strip()
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return (s.startswith('<')
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and not _repr_re.search(s))
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def compare_docs(self, want, got):
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if not self.tag_compare(want.tag, got.tag):
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return False
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if not self.text_compare(want.text, got.text, True):
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return False
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if not self.text_compare(want.tail, got.tail, True):
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return False
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if 'any' not in want.attrib:
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want_keys = sorted(want.attrib.keys())
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got_keys = sorted(got.attrib.keys())
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if want_keys != got_keys:
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return False
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for key in want_keys:
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if not self.text_compare(want.attrib[key], got.attrib[key], False):
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return False
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if want.text != '...' or len(want):
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want_children = list(want)
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got_children = list(got)
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while want_children or got_children:
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if not want_children or not got_children:
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return False
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want_first = want_children.pop(0)
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got_first = got_children.pop(0)
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if not self.compare_docs(want_first, got_first):
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return False
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if not got_children and want_first.tail == '...':
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break
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return True
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def text_compare(self, want, got, strip):
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want = want or ''
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got = got or ''
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if strip:
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want = norm_whitespace(want).strip()
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got = norm_whitespace(got).strip()
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want = '^%s$' % re.escape(want)
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want = want.replace(r'\.\.\.', '.*')
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if re.search(want, got):
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return True
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else:
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return False
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def tag_compare(self, want, got):
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if want == 'any':
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return True
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if (not isinstance(want, _basestring)
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or not isinstance(got, _basestring)):
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return want == got
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want = want or ''
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got = got or ''
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if want.startswith('{...}'):
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# Ellipsis on the namespace
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return want.split('}')[-1] == got.split('}')[-1]
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else:
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return want == got
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def output_difference(self, example, got, optionflags):
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want = example.want
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parser = self.get_parser(want, got, optionflags)
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errors = []
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if parser is not None:
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try:
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want_doc = parser(want)
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except etree.XMLSyntaxError:
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e = sys.exc_info()[1]
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errors.append('In example: %s' % e)
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try:
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got_doc = parser(got)
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except etree.XMLSyntaxError:
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e = sys.exc_info()[1]
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errors.append('In actual output: %s' % e)
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if parser is None or errors:
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value = OutputChecker.output_difference(
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self, example, got, optionflags)
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if errors:
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errors.append(value)
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return '\n'.join(errors)
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else:
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return value
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html = parser is html_fromstring
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diff_parts = []
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diff_parts.append('Expected:')
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diff_parts.append(self.format_doc(want_doc, html, 2))
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diff_parts.append('Got:')
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diff_parts.append(self.format_doc(got_doc, html, 2))
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diff_parts.append('Diff:')
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diff_parts.append(self.collect_diff(want_doc, got_doc, html, 2))
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return '\n'.join(diff_parts)
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def html_empty_tag(self, el, html=True):
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if not html:
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return False
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if el.tag not in self.empty_tags:
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return False
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if el.text or len(el):
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# This shouldn't happen (contents in an empty tag)
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return False
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return True
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def format_doc(self, doc, html, indent, prefix=''):
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parts = []
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if not len(doc):
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# No children...
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parts.append(' '*indent)
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parts.append(prefix)
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parts.append(self.format_tag(doc))
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if not self.html_empty_tag(doc, html):
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if strip(doc.text):
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parts.append(self.format_text(doc.text))
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parts.append(self.format_end_tag(doc))
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if strip(doc.tail):
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parts.append(self.format_text(doc.tail))
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parts.append('\n')
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return ''.join(parts)
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parts.append(' '*indent)
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parts.append(prefix)
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parts.append(self.format_tag(doc))
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if not self.html_empty_tag(doc, html):
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parts.append('\n')
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if strip(doc.text):
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parts.append(' '*indent)
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parts.append(self.format_text(doc.text))
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parts.append('\n')
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for el in doc:
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parts.append(self.format_doc(el, html, indent+2))
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parts.append(' '*indent)
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parts.append(self.format_end_tag(doc))
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parts.append('\n')
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if strip(doc.tail):
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parts.append(' '*indent)
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parts.append(self.format_text(doc.tail))
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parts.append('\n')
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return ''.join(parts)
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def format_text(self, text, strip=True):
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if text is None:
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return ''
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if strip:
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text = text.strip()
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return html_escape(text, 1)
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def format_tag(self, el):
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attrs = []
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if isinstance(el, etree.CommentBase):
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# FIXME: probably PIs should be handled specially too?
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return '<!--'
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for name, value in sorted(el.attrib.items()):
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attrs.append('%s="%s"' % (name, self.format_text(value, False)))
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if not attrs:
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return '<%s>' % el.tag
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return '<%s %s>' % (el.tag, ' '.join(attrs))
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def format_end_tag(self, el):
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if isinstance(el, etree.CommentBase):
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# FIXME: probably PIs should be handled specially too?
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return '-->'
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return '</%s>' % el.tag
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def collect_diff(self, want, got, html, indent):
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parts = []
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if not len(want) and not len(got):
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parts.append(' '*indent)
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parts.append(self.collect_diff_tag(want, got))
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if not self.html_empty_tag(got, html):
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parts.append(self.collect_diff_text(want.text, got.text))
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parts.append(self.collect_diff_end_tag(want, got))
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parts.append(self.collect_diff_text(want.tail, got.tail))
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parts.append('\n')
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return ''.join(parts)
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parts.append(' '*indent)
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parts.append(self.collect_diff_tag(want, got))
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parts.append('\n')
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if strip(want.text) or strip(got.text):
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parts.append(' '*indent)
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parts.append(self.collect_diff_text(want.text, got.text))
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parts.append('\n')
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want_children = list(want)
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got_children = list(got)
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while want_children or got_children:
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if not want_children:
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parts.append(self.format_doc(got_children.pop(0), html, indent+2, '+'))
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continue
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if not got_children:
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parts.append(self.format_doc(want_children.pop(0), html, indent+2, '-'))
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continue
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parts.append(self.collect_diff(
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want_children.pop(0), got_children.pop(0), html, indent+2))
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parts.append(' '*indent)
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parts.append(self.collect_diff_end_tag(want, got))
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parts.append('\n')
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if strip(want.tail) or strip(got.tail):
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parts.append(' '*indent)
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parts.append(self.collect_diff_text(want.tail, got.tail))
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parts.append('\n')
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return ''.join(parts)
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def collect_diff_tag(self, want, got):
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if not self.tag_compare(want.tag, got.tag):
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tag = '%s (got: %s)' % (want.tag, got.tag)
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else:
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tag = got.tag
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attrs = []
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any = want.tag == 'any' or 'any' in want.attrib
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for name, value in sorted(got.attrib.items()):
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if name not in want.attrib and not any:
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attrs.append('+%s="%s"' % (name, self.format_text(value, False)))
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else:
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if name in want.attrib:
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text = self.collect_diff_text(want.attrib[name], value, False)
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else:
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text = self.format_text(value, False)
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attrs.append('%s="%s"' % (name, text))
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if not any:
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for name, value in sorted(want.attrib.items()):
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|
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if name in got.attrib:
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continue
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attrs.append('-%s="%s"' % (name, self.format_text(value, False)))
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|
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if attrs:
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tag = '<%s %s>' % (tag, ' '.join(attrs))
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else:
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tag = '<%s>' % tag
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return tag
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def collect_diff_end_tag(self, want, got):
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|
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if want.tag != got.tag:
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tag = '%s (got: %s)' % (want.tag, got.tag)
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|
|
else:
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tag = got.tag
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return '</%s>' % tag
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|
|
def collect_diff_text(self, want, got, strip=True):
|
||
|
|
if self.text_compare(want, got, strip):
|
||
|
|
if not got:
|
||
|
|
return ''
|
||
|
|
return self.format_text(got, strip)
|
||
|
|
text = '%s (got: %s)' % (want, got)
|
||
|
|
return self.format_text(text, strip)
|
||
|
|
|
||
|
|
class LHTMLOutputChecker(LXMLOutputChecker):
|
||
|
|
def get_default_parser(self):
|
||
|
|
return html_fromstring
|
||
|
|
|
||
|
|
def install(html=False):
|
||
|
|
"""
|
||
|
|
Install doctestcompare for all future doctests.
|
||
|
|
|
||
|
|
If html is true, then by default the HTML parser will be used;
|
||
|
|
otherwise the XML parser is used.
|
||
|
|
"""
|
||
|
|
if html:
|
||
|
|
doctest.OutputChecker = LHTMLOutputChecker
|
||
|
|
else:
|
||
|
|
doctest.OutputChecker = LXMLOutputChecker
|
||
|
|
|
||
|
|
def temp_install(html=False, del_module=None):
|
||
|
|
"""
|
||
|
|
Use this *inside* a doctest to enable this checker for this
|
||
|
|
doctest only.
|
||
|
|
|
||
|
|
If html is true, then by default the HTML parser will be used;
|
||
|
|
otherwise the XML parser is used.
|
||
|
|
"""
|
||
|
|
if html:
|
||
|
|
Checker = LHTMLOutputChecker
|
||
|
|
else:
|
||
|
|
Checker = LXMLOutputChecker
|
||
|
|
frame = _find_doctest_frame()
|
||
|
|
dt_self = frame.f_locals['self']
|
||
|
|
checker = Checker()
|
||
|
|
old_checker = dt_self._checker
|
||
|
|
dt_self._checker = checker
|
||
|
|
# The unfortunate thing is that there is a local variable 'check'
|
||
|
|
# in the function that runs the doctests, that is a bound method
|
||
|
|
# into the output checker. We have to update that. We can't
|
||
|
|
# modify the frame, so we have to modify the object in place. The
|
||
|
|
# only way to do this is to actually change the func_code
|
||
|
|
# attribute of the method. We change it, and then wait for
|
||
|
|
# __record_outcome to be run, which signals the end of the __run
|
||
|
|
# method, at which point we restore the previous check_output
|
||
|
|
# implementation.
|
||
|
|
if _IS_PYTHON_3:
|
||
|
|
check_func = frame.f_locals['check'].__func__
|
||
|
|
checker_check_func = checker.check_output.__func__
|
||
|
|
else:
|
||
|
|
check_func = frame.f_locals['check'].im_func
|
||
|
|
checker_check_func = checker.check_output.im_func
|
||
|
|
# Because we can't patch up func_globals, this is the only global
|
||
|
|
# in check_output that we care about:
|
||
|
|
doctest.etree = etree
|
||
|
|
_RestoreChecker(dt_self, old_checker, checker,
|
||
|
|
check_func, checker_check_func,
|
||
|
|
del_module)
|
||
|
|
|
||
|
|
class _RestoreChecker(object):
|
||
|
|
def __init__(self, dt_self, old_checker, new_checker, check_func, clone_func,
|
||
|
|
del_module):
|
||
|
|
self.dt_self = dt_self
|
||
|
|
self.checker = old_checker
|
||
|
|
self.checker._temp_call_super_check_output = self.call_super
|
||
|
|
self.checker._temp_override_self = new_checker
|
||
|
|
self.check_func = check_func
|
||
|
|
self.clone_func = clone_func
|
||
|
|
self.del_module = del_module
|
||
|
|
self.install_clone()
|
||
|
|
self.install_dt_self()
|
||
|
|
def install_clone(self):
|
||
|
|
if _IS_PYTHON_3:
|
||
|
|
self.func_code = self.check_func.__code__
|
||
|
|
self.func_globals = self.check_func.__globals__
|
||
|
|
self.check_func.__code__ = self.clone_func.__code__
|
||
|
|
else:
|
||
|
|
self.func_code = self.check_func.func_code
|
||
|
|
self.func_globals = self.check_func.func_globals
|
||
|
|
self.check_func.func_code = self.clone_func.func_code
|
||
|
|
def uninstall_clone(self):
|
||
|
|
if _IS_PYTHON_3:
|
||
|
|
self.check_func.__code__ = self.func_code
|
||
|
|
else:
|
||
|
|
self.check_func.func_code = self.func_code
|
||
|
|
def install_dt_self(self):
|
||
|
|
self.prev_func = self.dt_self._DocTestRunner__record_outcome
|
||
|
|
self.dt_self._DocTestRunner__record_outcome = self
|
||
|
|
def uninstall_dt_self(self):
|
||
|
|
self.dt_self._DocTestRunner__record_outcome = self.prev_func
|
||
|
|
def uninstall_module(self):
|
||
|
|
if self.del_module:
|
||
|
|
import sys
|
||
|
|
del sys.modules[self.del_module]
|
||
|
|
if '.' in self.del_module:
|
||
|
|
package, module = self.del_module.rsplit('.', 1)
|
||
|
|
package_mod = sys.modules[package]
|
||
|
|
delattr(package_mod, module)
|
||
|
|
def __call__(self, *args, **kw):
|
||
|
|
self.uninstall_clone()
|
||
|
|
self.uninstall_dt_self()
|
||
|
|
del self.checker._temp_override_self
|
||
|
|
del self.checker._temp_call_super_check_output
|
||
|
|
result = self.prev_func(*args, **kw)
|
||
|
|
self.uninstall_module()
|
||
|
|
return result
|
||
|
|
def call_super(self, *args, **kw):
|
||
|
|
self.uninstall_clone()
|
||
|
|
try:
|
||
|
|
return self.check_func(*args, **kw)
|
||
|
|
finally:
|
||
|
|
self.install_clone()
|
||
|
|
|
||
|
|
def _find_doctest_frame():
|
||
|
|
import sys
|
||
|
|
frame = sys._getframe(1)
|
||
|
|
while frame:
|
||
|
|
l = frame.f_locals
|
||
|
|
if 'BOOM' in l:
|
||
|
|
# Sign of doctest
|
||
|
|
return frame
|
||
|
|
frame = frame.f_back
|
||
|
|
raise LookupError(
|
||
|
|
"Could not find doctest (only use this function *inside* a doctest)")
|
||
|
|
|
||
|
|
__test__ = {
|
||
|
|
'basic': '''
|
||
|
|
>>> temp_install()
|
||
|
|
>>> print """<xml a="1" b="2">stuff</xml>"""
|
||
|
|
<xml b="2" a="1">...</xml>
|
||
|
|
>>> print """<xml xmlns="http://example.com"><tag attr="bar" /></xml>"""
|
||
|
|
<xml xmlns="...">
|
||
|
|
<tag attr="..." />
|
||
|
|
</xml>
|
||
|
|
>>> print """<xml>blahblahblah<foo /></xml>""" # doctest: +NOPARSE_MARKUP, +ELLIPSIS
|
||
|
|
<xml>...foo /></xml>
|
||
|
|
'''}
|
||
|
|
|
||
|
|
if __name__ == '__main__':
|
||
|
|
import doctest
|
||
|
|
doctest.testmod()
|
||
|
|
|
||
|
|
|