devtools/htmlparser.py
author Sandrine Ribeau <sandrine.ribeau@logilab.fr>
Tue, 05 May 2009 02:03:45 -0700
changeset 1677 35861bfca748
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child 781 323656dd85a9
permissions -rw-r--r--
[doc] Change structure to make it more readable.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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"""defines a validating HTML parser used in web application tests"""
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import re
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from StringIO import StringIO
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from lxml import etree
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from lxml.builder import E
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from cubicweb.common.view import STRICT_DOCTYPE, TRANSITIONAL_DOCTYPE, CW_XHTML_EXTENSIONS
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STRICT_DOCTYPE = str(STRICT_DOCTYPE % CW_XHTML_EXTENSIONS).strip()
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TRANSITIONAL_DOCTYPE = str(TRANSITIONAL_DOCTYPE % CW_XHTML_EXTENSIONS).strip()
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ERR_COUNT = 0
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class Validator(object):
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    def parse_string(self, data, sysid=None):
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        try:
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            data = self.preprocess_data(data)
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            return PageInfo(data, etree.fromstring(data, self.parser))
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        except etree.XMLSyntaxError, exc:
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            def save_in(fname=''):
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                file(fname, 'w').write(data)
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            new_exc = AssertionError(u'invalid xml %s' % exc)
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            new_exc.position = exc.position
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            raise new_exc
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    def preprocess_data(self, data):
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        return data
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class DTDValidator(Validator):
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    def __init__(self):
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        Validator.__init__(self)
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        self.parser = etree.XMLParser(dtd_validation=True)
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    def preprocess_data(self, data):
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        """used to fix potential blockquote mess generated by docutils"""
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        if STRICT_DOCTYPE not in data:
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            return data
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        # parse using transitional DTD
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        data = data.replace(STRICT_DOCTYPE, TRANSITIONAL_DOCTYPE)
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        tree = etree.fromstring(data, self.parser)
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        namespace = tree.nsmap.get(None)
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        # this is the list of authorized child tags for <blockquote> nodes
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        expected = 'p h1 h2 h3 h4 h5 h6 div ul ol dl pre hr blockquote address ' \
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                   'fieldset table form noscript ins del script'.split()
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        if namespace:
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            blockquotes = tree.findall('.//{%s}blockquote' % namespace)
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            expected = ['{%s}%s' % (namespace, tag) for tag in expected]
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        else:
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            blockquotes = tree.findall('.//blockquote')
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        # quick and dirty approach: remove all blockquotes
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        for blockquote in blockquotes:
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            parent = blockquote.getparent()
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            parent.remove(blockquote)
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##         # for each blockquote, wrap unauthorized child in a div
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##         for blockquote in blockquotes:
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##             if len(blockquote):
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##                 needs_wrap = [(index, child) for index, child in enumerate(blockquote)
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##                               if child.tag not in expected]
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##                 for index, child in needs_wrap:
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##                     # the child is automatically popped from blockquote when
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##                     # its parent is changed
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##                     div = E.div(child)
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##                     blockquote.insert(index, div)
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##             elif blockquote.text:
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##                 div = E.div(blockquote.text)
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##                 blockquote.text = None
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##                 blockquote.append(div)
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        data = etree.tostring(tree)
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        return '<?xml version="1.0" encoding="UTF-8"?>%s\n%s' % (STRICT_DOCTYPE, data)
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class SaxOnlyValidator(Validator):
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    def __init__(self):
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        Validator.__init__(self)
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        self.parser = etree.XMLParser()
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class HTMLValidator(Validator):
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    def __init__(self):
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        Validator.__init__(self)
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        self.parser = etree.HTMLParser()
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class PageInfo(object):
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    """holds various informations on the view's output"""
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    def __init__(self, source, root):
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        self.source = source
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        self.etree = root
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        self.source = source
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        self.raw_text = u''.join(root.xpath('//text()'))
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        self.namespace = self.etree.nsmap
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        self.default_ns = self.namespace.get(None)
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        self.a_tags = self.find_tag('a')
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        self.h1_tags = self.find_tag('h1')
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        self.h2_tags = self.find_tag('h2')
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        self.h3_tags = self.find_tag('h3')
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        self.h4_tags = self.find_tag('h4')
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        self.input_tags = self.find_tag('input')
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        self.title_tags = [self.h1_tags, self.h2_tags, self.h3_tags, self.h4_tags]
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    def find_tag(self, tag):
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        """return a list which contains text of all "tag" elements """
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        if self.default_ns is None:
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            iterstr = ".//%s" % tag
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        else:
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            iterstr = ".//{%s}%s" % (self.default_ns, tag)
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        if tag in ('a', 'input'):
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            return [(elt.text, elt.attrib) for elt in self.etree.iterfind(iterstr)]
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        return [u''.join(elt.xpath('.//text()')) for elt in self.etree.iterfind(iterstr)]
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    def appears(self, text):
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        """returns True if <text> appears in the page"""
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        return text in self.raw_text
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    def __contains__(self, text):
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        return text in self.source
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    def has_title(self, text, level=None):
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        """returns True if <h?>text</h?>
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        :param level: the title's level (1 for h1, 2 for h2, etc.)
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        """
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        if level is None:
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            for hlist in self.title_tags:
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                if text in hlist:
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                    return True
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            return False
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        else:
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            hlist = self.title_tags[level - 1]
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            return text in hlist
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    def has_title_regexp(self, pattern, level=None):
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        """returns True if <h?>pattern</h?>"""
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        sre = re.compile(pattern)
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        if level is None:
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            for hlist in self.title_tags:
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                for title in hlist:
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                    if sre.match(title):
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                        return True
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            return False
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        else:
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            hlist = self.title_tags[level - 1]
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            for title in hlist:
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                if sre.match(title):
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                    return True
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            return False
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    def has_link(self, text, url=None):
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        """returns True if <a href=url>text</a> was found in the page"""
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        for link_text, attrs in self.a_tags:
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            if text == link_text:
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                if url is None:
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                    return True
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                try:
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                    href = attrs['href']
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                    if href == url:
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                        return True
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                except KeyError:
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                    continue
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        return False
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    def has_link_regexp(self, pattern, url=None):
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        """returns True if <a href=url>pattern</a> was found in the page"""
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        sre = re.compile(pattern)
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        for link_text, attrs in self.a_tags:
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            if sre.match(link_text):
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                if url is None:
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                    return True
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                try:
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                    href = attrs['href']
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                    if href == url:
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                        return True
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                except KeyError:
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                    continue
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        return False