diff env/lib/python3.9/site-packages/lxml/html/html5parser.py @ 0:4f3585e2f14b draft default tip

"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/env/lib/python3.9/site-packages/lxml/html/html5parser.py	Mon Mar 22 18:12:50 2021 +0000
@@ -0,0 +1,260 @@
+"""
+An interface to html5lib that mimics the lxml.html interface.
+"""
+import sys
+import string
+
+from html5lib import HTMLParser as _HTMLParser
+from html5lib.treebuilders.etree_lxml import TreeBuilder
+from lxml import etree
+from lxml.html import Element, XHTML_NAMESPACE, _contains_block_level_tag
+
+# python3 compatibility
+try:
+    _strings = basestring
+except NameError:
+    _strings = (bytes, str)
+try:
+    from urllib2 import urlopen
+except ImportError:
+    from urllib.request import urlopen
+try:
+    from urlparse import urlparse
+except ImportError:
+    from urllib.parse import urlparse
+
+
+class HTMLParser(_HTMLParser):
+    """An html5lib HTML parser with lxml as tree."""
+
+    def __init__(self, strict=False, **kwargs):
+        _HTMLParser.__init__(self, strict=strict, tree=TreeBuilder, **kwargs)
+
+
+try:
+    from html5lib import XHTMLParser as _XHTMLParser
+except ImportError:
+    pass
+else:
+    class XHTMLParser(_XHTMLParser):
+        """An html5lib XHTML Parser with lxml as tree."""
+
+        def __init__(self, strict=False, **kwargs):
+            _XHTMLParser.__init__(self, strict=strict, tree=TreeBuilder, **kwargs)
+
+    xhtml_parser = XHTMLParser()
+
+
+def _find_tag(tree, tag):
+    elem = tree.find(tag)
+    if elem is not None:
+        return elem
+    return tree.find('{%s}%s' % (XHTML_NAMESPACE, tag))
+
+
+def document_fromstring(html, guess_charset=None, parser=None):
+    """
+    Parse a whole document into a string.
+
+    If `guess_charset` is true, or if the input is not Unicode but a
+    byte string, the `chardet` library will perform charset guessing
+    on the string.
+    """
+    if not isinstance(html, _strings):
+        raise TypeError('string required')
+
+    if parser is None:
+        parser = html_parser
+
+    options = {}
+    if guess_charset is None and isinstance(html, bytes):
+        # html5lib does not accept useChardet as an argument, if it
+        # detected the html argument would produce unicode objects.
+        guess_charset = True
+    if guess_charset is not None:
+        options['useChardet'] = guess_charset
+    return parser.parse(html, **options).getroot()
+
+
+def fragments_fromstring(html, no_leading_text=False,
+                         guess_charset=None, parser=None):
+    """Parses several HTML elements, returning a list of elements.
+
+    The first item in the list may be a string.  If no_leading_text is true,
+    then it will be an error if there is leading text, and it will always be
+    a list of only elements.
+
+    If `guess_charset` is true, the `chardet` library will perform charset
+    guessing on the string.
+    """
+    if not isinstance(html, _strings):
+        raise TypeError('string required')
+
+    if parser is None:
+        parser = html_parser
+
+    options = {}
+    if guess_charset is None and isinstance(html, bytes):
+        # html5lib does not accept useChardet as an argument, if it
+        # detected the html argument would produce unicode objects.
+        guess_charset = False
+    if guess_charset is not None:
+        options['useChardet'] = guess_charset
+    children = parser.parseFragment(html, 'div', **options)
+    if children and isinstance(children[0], _strings):
+        if no_leading_text:
+            if children[0].strip():
+                raise etree.ParserError('There is leading text: %r' %
+                                        children[0])
+            del children[0]
+    return children
+
+
+def fragment_fromstring(html, create_parent=False,
+                        guess_charset=None, parser=None):
+    """Parses a single HTML element; it is an error if there is more than
+    one element, or if anything but whitespace precedes or follows the
+    element.
+
+    If 'create_parent' is true (or is a tag name) then a parent node
+    will be created to encapsulate the HTML in a single element.  In
+    this case, leading or trailing text is allowed.
+
+    If `guess_charset` is true, the `chardet` library will perform charset
+    guessing on the string.
+    """
+    if not isinstance(html, _strings):
+        raise TypeError('string required')
+
+    accept_leading_text = bool(create_parent)
+
+    elements = fragments_fromstring(
+        html, guess_charset=guess_charset, parser=parser,
+        no_leading_text=not accept_leading_text)
+
+    if create_parent:
+        if not isinstance(create_parent, _strings):
+            create_parent = 'div'
+        new_root = Element(create_parent)
+        if elements:
+            if isinstance(elements[0], _strings):
+                new_root.text = elements[0]
+                del elements[0]
+            new_root.extend(elements)
+        return new_root
+
+    if not elements:
+        raise etree.ParserError('No elements found')
+    if len(elements) > 1:
+        raise etree.ParserError('Multiple elements found')
+    result = elements[0]
+    if result.tail and result.tail.strip():
+        raise etree.ParserError('Element followed by text: %r' % result.tail)
+    result.tail = None
+    return result
+
+
+def fromstring(html, guess_charset=None, parser=None):
+    """Parse the html, returning a single element/document.
+
+    This tries to minimally parse the chunk of text, without knowing if it
+    is a fragment or a document.
+
+    'base_url' will set the document's base_url attribute (and the tree's
+    docinfo.URL)
+
+    If `guess_charset` is true, or if the input is not Unicode but a
+    byte string, the `chardet` library will perform charset guessing
+    on the string.
+    """
+    if not isinstance(html, _strings):
+        raise TypeError('string required')
+    doc = document_fromstring(html, parser=parser,
+                              guess_charset=guess_charset)
+
+    # document starts with doctype or <html>, full document!
+    start = html[:50]
+    if isinstance(start, bytes):
+        # Allow text comparison in python3.
+        # Decode as ascii, that also covers latin-1 and utf-8 for the
+        # characters we need.
+        start = start.decode('ascii', 'replace')
+
+    start = start.lstrip().lower()
+    if start.startswith('<html') or start.startswith('<!doctype'):
+        return doc
+
+    head = _find_tag(doc, 'head')
+
+    # if the head is not empty we have a full document
+    if len(head):
+        return doc
+
+    body = _find_tag(doc, 'body')
+
+    # The body has just one element, so it was probably a single
+    # element passed in
+    if (len(body) == 1 and (not body.text or not body.text.strip())
+        and (not body[-1].tail or not body[-1].tail.strip())):
+        return body[0]
+
+    # Now we have a body which represents a bunch of tags which have the
+    # content that was passed in.  We will create a fake container, which
+    # is the body tag, except <body> implies too much structure.
+    if _contains_block_level_tag(body):
+        body.tag = 'div'
+    else:
+        body.tag = 'span'
+    return body
+
+
+def parse(filename_url_or_file, guess_charset=None, parser=None):
+    """Parse a filename, URL, or file-like object into an HTML document
+    tree.  Note: this returns a tree, not an element.  Use
+    ``parse(...).getroot()`` to get the document root.
+
+    If ``guess_charset`` is true, the ``useChardet`` option is passed into
+    html5lib to enable character detection.  This option is on by default
+    when parsing from URLs, off by default when parsing from file(-like)
+    objects (which tend to return Unicode more often than not), and on by
+    default when parsing from a file path (which is read in binary mode).
+    """
+    if parser is None:
+        parser = html_parser
+    if not isinstance(filename_url_or_file, _strings):
+        fp = filename_url_or_file
+        if guess_charset is None:
+            # assume that file-like objects return Unicode more often than bytes
+            guess_charset = False
+    elif _looks_like_url(filename_url_or_file):
+        fp = urlopen(filename_url_or_file)
+        if guess_charset is None:
+            # assume that URLs return bytes
+            guess_charset = True
+    else:
+        fp = open(filename_url_or_file, 'rb')
+        if guess_charset is None:
+            guess_charset = True
+
+    options = {}
+    # html5lib does not accept useChardet as an argument, if it
+    # detected the html argument would produce unicode objects.
+    if guess_charset:
+        options['useChardet'] = guess_charset
+    return parser.parse(fp, **options)
+
+
+def _looks_like_url(str):
+    scheme = urlparse(str)[0]
+    if not scheme:
+        return False
+    elif (sys.platform == 'win32' and
+            scheme in string.ascii_letters
+            and len(scheme) == 1):
+        # looks like a 'normal' absolute path
+        return False
+    else:
+        return True
+
+
+html_parser = HTMLParser()