Mercurial > repos > shellac > guppy_basecaller
diff env/lib/python3.7/site-packages/lxml/html/soupparser.py @ 0:26e78fe6e8c4 draft
"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
| author | shellac |
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| date | Sat, 02 May 2020 07:14:21 -0400 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/env/lib/python3.7/site-packages/lxml/html/soupparser.py Sat May 02 07:14:21 2020 -0400 @@ -0,0 +1,314 @@ +"""External interface to the BeautifulSoup HTML parser. +""" + +__all__ = ["fromstring", "parse", "convert_tree"] + +import re +from lxml import etree, html + +try: + from bs4 import ( + BeautifulSoup, Tag, Comment, ProcessingInstruction, NavigableString, + Declaration, Doctype) + _DECLARATION_OR_DOCTYPE = (Declaration, Doctype) +except ImportError: + from BeautifulSoup import ( + BeautifulSoup, Tag, Comment, ProcessingInstruction, NavigableString, + Declaration) + _DECLARATION_OR_DOCTYPE = Declaration + + +def fromstring(data, beautifulsoup=None, makeelement=None, **bsargs): + """Parse a string of HTML data into an Element tree using the + BeautifulSoup parser. + + Returns the root ``<html>`` Element of the tree. + + You can pass a different BeautifulSoup parser through the + `beautifulsoup` keyword, and a diffent Element factory function + through the `makeelement` keyword. By default, the standard + ``BeautifulSoup`` class and the default factory of `lxml.html` are + used. + """ + return _parse(data, beautifulsoup, makeelement, **bsargs) + + +def parse(file, beautifulsoup=None, makeelement=None, **bsargs): + """Parse a file into an ElemenTree using the BeautifulSoup parser. + + You can pass a different BeautifulSoup parser through the + `beautifulsoup` keyword, and a diffent Element factory function + through the `makeelement` keyword. By default, the standard + ``BeautifulSoup`` class and the default factory of `lxml.html` are + used. + """ + if not hasattr(file, 'read'): + file = open(file) + root = _parse(file, beautifulsoup, makeelement, **bsargs) + return etree.ElementTree(root) + + +def convert_tree(beautiful_soup_tree, makeelement=None): + """Convert a BeautifulSoup tree to a list of Element trees. + + Returns a list instead of a single root Element to support + HTML-like soup with more than one root element. + + You can pass a different Element factory through the `makeelement` + keyword. + """ + root = _convert_tree(beautiful_soup_tree, makeelement) + children = root.getchildren() + for child in children: + root.remove(child) + return children + + +# helpers + +def _parse(source, beautifulsoup, makeelement, **bsargs): + if beautifulsoup is None: + beautifulsoup = BeautifulSoup + if hasattr(beautifulsoup, "HTML_ENTITIES"): # bs3 + if 'convertEntities' not in bsargs: + bsargs['convertEntities'] = 'html' + if hasattr(beautifulsoup, "DEFAULT_BUILDER_FEATURES"): # bs4 + if 'features' not in bsargs: + bsargs['features'] = 'html.parser' # use Python html parser + tree = beautifulsoup(source, **bsargs) + root = _convert_tree(tree, makeelement) + # from ET: wrap the document in a html root element, if necessary + if len(root) == 1 and root[0].tag == "html": + return root[0] + root.tag = "html" + return root + + +_parse_doctype_declaration = re.compile( + r'(?:\s|[<!])*DOCTYPE\s*HTML' + r'(?:\s+PUBLIC)?(?:\s+(\'[^\']*\'|"[^"]*"))?' + r'(?:\s+(\'[^\']*\'|"[^"]*"))?', + re.IGNORECASE).match + + +class _PseudoTag: + # Minimal imitation of BeautifulSoup.Tag + def __init__(self, contents): + self.name = 'html' + self.attrs = [] + self.contents = contents + + def __iter__(self): + return self.contents.__iter__() + + +def _convert_tree(beautiful_soup_tree, makeelement): + if makeelement is None: + makeelement = html.html_parser.makeelement + + # Split the tree into three parts: + # i) everything before the root element: document type + # declaration, comments, processing instructions, whitespace + # ii) the root(s), + # iii) everything after the root: comments, processing + # instructions, whitespace + first_element_idx = last_element_idx = None + html_root = declaration = None + for i, e in enumerate(beautiful_soup_tree): + if isinstance(e, Tag): + if first_element_idx is None: + first_element_idx = i + last_element_idx = i + if html_root is None and e.name and e.name.lower() == 'html': + html_root = e + elif declaration is None and isinstance(e, _DECLARATION_OR_DOCTYPE): + declaration = e + + # For a nice, well-formatted document, the variable roots below is + # a list consisting of a single <html> element. However, the document + # may be a soup like '<meta><head><title>Hello</head><body>Hi + # all<\p>'. In this example roots is a list containing meta, head + # and body elements. + if first_element_idx is None: + pre_root = post_root = [] + roots = beautiful_soup_tree.contents + else: + pre_root = beautiful_soup_tree.contents[:first_element_idx] + roots = beautiful_soup_tree.contents[first_element_idx:last_element_idx+1] + post_root = beautiful_soup_tree.contents[last_element_idx+1:] + + # Reorganize so that there is one <html> root... + if html_root is not None: + # ... use existing one if possible, ... + i = roots.index(html_root) + html_root.contents = roots[:i] + html_root.contents + roots[i+1:] + else: + # ... otherwise create a new one. + html_root = _PseudoTag(roots) + + convert_node = _init_node_converters(makeelement) + + # Process pre_root + res_root = convert_node(html_root) + prev = res_root + for e in reversed(pre_root): + converted = convert_node(e) + if converted is not None: + prev.addprevious(converted) + prev = converted + + # ditto for post_root + prev = res_root + for e in post_root: + converted = convert_node(e) + if converted is not None: + prev.addnext(converted) + prev = converted + + if declaration is not None: + try: + # bs4 provides full Doctype string + doctype_string = declaration.output_ready() + except AttributeError: + doctype_string = declaration.string + + match = _parse_doctype_declaration(doctype_string) + if not match: + # Something is wrong if we end up in here. Since soupparser should + # tolerate errors, do not raise Exception, just let it pass. + pass + else: + external_id, sys_uri = match.groups() + docinfo = res_root.getroottree().docinfo + # strip quotes and update DOCTYPE values (any of None, '', '...') + docinfo.public_id = external_id and external_id[1:-1] + docinfo.system_url = sys_uri and sys_uri[1:-1] + + return res_root + + +def _init_node_converters(makeelement): + converters = {} + ordered_node_types = [] + + def converter(*types): + def add(handler): + for t in types: + converters[t] = handler + ordered_node_types.append(t) + return handler + return add + + def find_best_converter(node): + for t in ordered_node_types: + if isinstance(node, t): + return converters[t] + return None + + def convert_node(bs_node, parent=None): + # duplicated in convert_tag() below + try: + handler = converters[type(bs_node)] + except KeyError: + handler = converters[type(bs_node)] = find_best_converter(bs_node) + if handler is None: + return None + return handler(bs_node, parent) + + def map_attrs(bs_attrs): + if isinstance(bs_attrs, dict): # bs4 + attribs = {} + for k, v in bs_attrs.items(): + if isinstance(v, list): + v = " ".join(v) + attribs[k] = unescape(v) + else: + attribs = dict((k, unescape(v)) for k, v in bs_attrs) + return attribs + + def append_text(parent, text): + if len(parent) == 0: + parent.text = (parent.text or '') + text + else: + parent[-1].tail = (parent[-1].tail or '') + text + + # converters are tried in order of their definition + + @converter(Tag, _PseudoTag) + def convert_tag(bs_node, parent): + attrs = bs_node.attrs + if parent is not None: + attribs = map_attrs(attrs) if attrs else None + res = etree.SubElement(parent, bs_node.name, attrib=attribs) + else: + attribs = map_attrs(attrs) if attrs else {} + res = makeelement(bs_node.name, attrib=attribs) + + for child in bs_node: + # avoid double recursion by inlining convert_node(), see above + try: + handler = converters[type(child)] + except KeyError: + pass + else: + if handler is not None: + handler(child, res) + continue + convert_node(child, res) + return res + + @converter(Comment) + def convert_comment(bs_node, parent): + res = html.HtmlComment(bs_node) + if parent is not None: + parent.append(res) + return res + + @converter(ProcessingInstruction) + def convert_pi(bs_node, parent): + if bs_node.endswith('?'): + # The PI is of XML style (<?as df?>) but BeautifulSoup + # interpreted it as being SGML style (<?as df>). Fix. + bs_node = bs_node[:-1] + res = etree.ProcessingInstruction(*bs_node.split(' ', 1)) + if parent is not None: + parent.append(res) + return res + + @converter(NavigableString) + def convert_text(bs_node, parent): + if parent is not None: + append_text(parent, unescape(bs_node)) + return None + + return convert_node + + +# copied from ET's ElementSoup + +try: + from html.entities import name2codepoint # Python 3 +except ImportError: + from htmlentitydefs import name2codepoint + + +handle_entities = re.compile(r"&(\w+);").sub + + +try: + unichr +except NameError: + # Python 3 + unichr = chr + + +def unescape(string): + if not string: + return '' + # work around oddities in BeautifulSoup's entity handling + def unescape_entity(m): + try: + return unichr(name2codepoint[m.group(1)]) + except KeyError: + return m.group(0) # use as is + return handle_entities(unescape_entity, string)