week06

env/lib/python3.12/site-packages/lxml/doctestcompare.py

@@ -0,0 +1,488 @@
+"""
+lxml-based doctest output comparison.
+
+Note: normally, you should just import the `lxml.usedoctest` and
+`lxml.html.usedoctest` modules from within a doctest, instead of this
+one::
+
+    >>> import lxml.usedoctest # for XML output
+
+    >>> import lxml.html.usedoctest # for HTML output
+
+To use this module directly, you must call ``lxmldoctest.install()``,
+which will cause doctest to use this in all subsequent calls.
+
+This changes the way output is checked and comparisons are made for
+XML or HTML-like content.
+
+XML or HTML content is noticed because the example starts with ``<``
+(it's HTML if it starts with ``<html``).  You can also use the
+``PARSE_HTML`` and ``PARSE_XML`` flags to force parsing.
+
+Some rough wildcard-like things are allowed.  Whitespace is generally
+ignored (except in attributes).  In text (attributes and text in the
+body) you can use ``...`` as a wildcard.  In an example it also
+matches any trailing tags in the element, though it does not match
+leading tags.  You may create a tag ``<any>`` or include an ``any``
+attribute in the tag.  An ``any`` tag matches any tag, while the
+attribute matches any and all attributes.
+
+When a match fails, the reformatted example and gotten text is
+displayed (indented), and a rough diff-like output is given.  Anything
+marked with ``+`` is in the output but wasn't supposed to be, and
+similarly ``-`` means its in the example but wasn't in the output.
+
+You can disable parsing on one line with ``# doctest:+NOPARSE_MARKUP``
+"""
+
+from lxml import etree
+import sys
+import re
+import doctest
+try:
+    from html import escape as html_escape
+except ImportError:
+    from cgi import escape as html_escape
+
+__all__ = ['PARSE_HTML', 'PARSE_XML', 'NOPARSE_MARKUP', 'LXMLOutputChecker',
+           'LHTMLOutputChecker', 'install', 'temp_install']
+
+PARSE_HTML = doctest.register_optionflag('PARSE_HTML')
+PARSE_XML = doctest.register_optionflag('PARSE_XML')
+NOPARSE_MARKUP = doctest.register_optionflag('NOPARSE_MARKUP')
+
+OutputChecker = doctest.OutputChecker
+
+def strip(v):
+    if v is None:
+        return None
+    else:
+        return v.strip()
+
+def norm_whitespace(v):
+    return _norm_whitespace_re.sub(' ', v)
+
+_html_parser = etree.HTMLParser(recover=False, remove_blank_text=True)
+
+def html_fromstring(html):
+    return etree.fromstring(html, _html_parser)
+
+# We use this to distinguish repr()s from elements:
+_repr_re = re.compile(r'^<[^>]+ (at|object) ')
+_norm_whitespace_re = re.compile(r'[ \t\n][ \t\n]+')
+
+class LXMLOutputChecker(OutputChecker):
+
+    empty_tags = (
+        'param', 'img', 'area', 'br', 'basefont', 'input',
+        'base', 'meta', 'link', 'col')
+
+    def get_default_parser(self):
+        return etree.XML
+
+    def check_output(self, want, got, optionflags):
+        alt_self = getattr(self, '_temp_override_self', None)
+        if alt_self is not None:
+            super_method = self._temp_call_super_check_output
+            self = alt_self
+        else:
+            super_method = OutputChecker.check_output
+        parser = self.get_parser(want, got, optionflags)
+        if not parser:
+            return super_method(
+                self, want, got, optionflags)
+        try:
+            want_doc = parser(want)
+        except etree.XMLSyntaxError:
+            return False
+        try:
+            got_doc = parser(got)
+        except etree.XMLSyntaxError:
+            return False
+        return self.compare_docs(want_doc, got_doc)
+
+    def get_parser(self, want, got, optionflags):
+        parser = None
+        if NOPARSE_MARKUP & optionflags:
+            return None
+        if PARSE_HTML & optionflags:
+            parser = html_fromstring
+        elif PARSE_XML & optionflags:
+            parser = etree.XML
+        elif (want.strip().lower().startswith('<html')
+              and got.strip().startswith('<html')):
+            parser = html_fromstring
+        elif (self._looks_like_markup(want)
+              and self._looks_like_markup(got)):
+            parser = self.get_default_parser()
+        return parser
+
+    def _looks_like_markup(self, s):
+        s = s.strip()
+        return (s.startswith('<')
+                and not _repr_re.search(s))
+
+    def compare_docs(self, want, got):
+        if not self.tag_compare(want.tag, got.tag):
+            return False
+        if not self.text_compare(want.text, got.text, True):
+            return False
+        if not self.text_compare(want.tail, got.tail, True):
+            return False
+        if 'any' not in want.attrib:
+            want_keys = sorted(want.attrib.keys())
+            got_keys = sorted(got.attrib.keys())
+            if want_keys != got_keys:
+                return False
+            for key in want_keys:
+                if not self.text_compare(want.attrib[key], got.attrib[key], False):
+                    return False
+        if want.text != '...' or len(want):
+            want_children = list(want)
+            got_children = list(got)
+            while want_children or got_children:
+                if not want_children or not got_children:
+                    return False
+                want_first = want_children.pop(0)
+                got_first = got_children.pop(0)
+                if not self.compare_docs(want_first, got_first):
+                    return False
+                if not got_children and want_first.tail == '...':
+                    break
+        return True
+
+    def text_compare(self, want, got, strip):
+        want = want or ''
+        got = got or ''
+        if strip:
+            want = norm_whitespace(want).strip()
+            got = norm_whitespace(got).strip()
+        want = '^%s$' % re.escape(want)
+        want = want.replace(r'\.\.\.', '.*')
+        if re.search(want, got):
+            return True
+        else:
+            return False
+
+    def tag_compare(self, want, got):
+        if want == 'any':
+            return True
+        if (not isinstance(want, (str, bytes))
+                or not isinstance(got, (str, bytes))):
+            return want == got
+        want = want or ''
+        got = got or ''
+        if want.startswith('{...}'):
+            # Ellipsis on the namespace
+            return want.split('}')[-1] == got.split('}')[-1]
+        else:
+            return want == got
+
+    def output_difference(self, example, got, optionflags):
+        want = example.want
+        parser = self.get_parser(want, got, optionflags)
+        errors = []
+        if parser is not None:
+            try:
+                want_doc = parser(want)
+            except etree.XMLSyntaxError:
+                e = sys.exc_info()[1]
+                errors.append('In example: %s' % e)
+            try:
+                got_doc = parser(got)
+            except etree.XMLSyntaxError:
+                e = sys.exc_info()[1]
+                errors.append('In actual output: %s' % e)
+        if parser is None or errors:
+            value = OutputChecker.output_difference(
+                self, example, got, optionflags)
+            if errors:
+                errors.append(value)
+                return '\n'.join(errors)
+            else:
+                return value
+        html = parser is html_fromstring
+        diff_parts = ['Expected:',
+                      self.format_doc(want_doc, html, 2),
+                      'Got:',
+                      self.format_doc(got_doc, html, 2),
+                      'Diff:',
+                      self.collect_diff(want_doc, got_doc, html, 2)]
+        return '\n'.join(diff_parts)
+
+    def html_empty_tag(self, el, html=True):
+        if not html:
+            return False
+        if el.tag not in self.empty_tags:
+            return False
+        if el.text or len(el):
+            # This shouldn't happen (contents in an empty tag)
+            return False
+        return True
+
+    def format_doc(self, doc, html, indent, prefix=''):
+        parts = []
+        if not len(doc):
+            # No children...
+            parts.append(' '*indent)
+            parts.append(prefix)
+            parts.append(self.format_tag(doc))
+            if not self.html_empty_tag(doc, html):
+                if strip(doc.text):
+                    parts.append(self.format_text(doc.text))
+                parts.append(self.format_end_tag(doc))
+            if strip(doc.tail):
+                parts.append(self.format_text(doc.tail))
+            parts.append('\n')
+            return ''.join(parts)
+        parts.append(' '*indent)
+        parts.append(prefix)
+        parts.append(self.format_tag(doc))
+        if not self.html_empty_tag(doc, html):
+            parts.append('\n')
+            if strip(doc.text):
+                parts.append(' '*indent)
+                parts.append(self.format_text(doc.text))
+                parts.append('\n')
+            for el in doc:
+                parts.append(self.format_doc(el, html, indent+2))
+            parts.append(' '*indent)
+            parts.append(self.format_end_tag(doc))
+            parts.append('\n')
+        if strip(doc.tail):
+            parts.append(' '*indent)
+            parts.append(self.format_text(doc.tail))
+            parts.append('\n')
+        return ''.join(parts)
+
+    def format_text(self, text, strip=True):
+        if text is None:
+            return ''
+        if strip:
+            text = text.strip()
+        return html_escape(text, 1)
+
+    def format_tag(self, el):
+        attrs = []
+        if isinstance(el, etree.CommentBase):
+            # FIXME: probably PIs should be handled specially too?
+            return '<!--'
+        for name, value in sorted(el.attrib.items()):
+            attrs.append('%s="%s"' % (name, self.format_text(value, False)))
+        if not attrs:
+            return '<%s>' % el.tag
+        return '<%s %s>' % (el.tag, ' '.join(attrs))
+    
+    def format_end_tag(self, el):
+        if isinstance(el, etree.CommentBase):
+            # FIXME: probably PIs should be handled specially too?
+            return '-->'
+        return '</%s>' % el.tag
+
+    def collect_diff(self, want, got, html, indent):
+        parts = []
+        if not len(want) and not len(got):
+            parts.append(' '*indent)
+            parts.append(self.collect_diff_tag(want, got))
+            if not self.html_empty_tag(got, html):
+                parts.append(self.collect_diff_text(want.text, got.text))
+                parts.append(self.collect_diff_end_tag(want, got))
+            parts.append(self.collect_diff_text(want.tail, got.tail))
+            parts.append('\n')
+            return ''.join(parts)
+        parts.append(' '*indent)
+        parts.append(self.collect_diff_tag(want, got))
+        parts.append('\n')
+        if strip(want.text) or strip(got.text):
+            parts.append(' '*indent)
+            parts.append(self.collect_diff_text(want.text, got.text))
+            parts.append('\n')
+        want_children = list(want)
+        got_children = list(got)
+        while want_children or got_children:
+            if not want_children:
+                parts.append(self.format_doc(got_children.pop(0), html, indent+2, '+'))
+                continue
+            if not got_children:
+                parts.append(self.format_doc(want_children.pop(0), html, indent+2, '-'))
+                continue
+            parts.append(self.collect_diff(
+                want_children.pop(0), got_children.pop(0), html, indent+2))
+        parts.append(' '*indent)
+        parts.append(self.collect_diff_end_tag(want, got))
+        parts.append('\n')
+        if strip(want.tail) or strip(got.tail):
+            parts.append(' '*indent)
+            parts.append(self.collect_diff_text(want.tail, got.tail))
+            parts.append('\n')
+        return ''.join(parts)
+
+    def collect_diff_tag(self, want, got):
+        if not self.tag_compare(want.tag, got.tag):
+            tag = '%s (got: %s)' % (want.tag, got.tag)
+        else:
+            tag = got.tag
+        attrs = []
+        any = want.tag == 'any' or 'any' in want.attrib
+        for name, value in sorted(got.attrib.items()):
+            if name not in want.attrib and not any:
+                attrs.append('+%s="%s"' % (name, self.format_text(value, False)))
+            else:
+                if name in want.attrib:
+                    text = self.collect_diff_text(want.attrib[name], value, False)
+                else:
+                    text = self.format_text(value, False)
+                attrs.append('%s="%s"' % (name, text))
+        if not any:
+            for name, value in sorted(want.attrib.items()):
+                if name in got.attrib:
+                    continue
+                attrs.append('-%s="%s"' % (name, self.format_text(value, False)))
+        if attrs:
+            tag = '<%s %s>' % (tag, ' '.join(attrs))
+        else:
+            tag = '<%s>' % tag
+        return tag
+
+    def collect_diff_end_tag(self, want, got):
+        if want.tag != got.tag:
+            tag = '%s (got: %s)' % (want.tag, got.tag)
+        else:
+            tag = got.tag
+        return '</%s>' % tag
+
+    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.
+    check_func = frame.f_locals['check'].__func__
+    checker_check_func = checker.check_output.__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:
+    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):
+        self.func_code = self.check_func.__code__
+        self.func_globals = self.check_func.__globals__
+        self.check_func.__code__ = self.clone_func.__code__
+    def uninstall_clone(self):
+        self.check_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()
+    
+