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1537 lines
53 KiB
Python
1537 lines
53 KiB
Python
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"""
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Manipulate HTML or XHTML documents.
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Version 1.1.1. This source code has been placed in the
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public domain by Connelly Barnes.
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Features:
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- Translate HTML back and forth to data structures.
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This allows you to read and write HTML documents
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programmably, with much flexibility.
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- Extract and modify URLs in an HTML document.
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- Compatible with Python 2.0 - 2.5.
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See the L{examples} for a quick start.
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"""
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__version__ = '1.1.1'
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__all__ = ['examples', 'tagextract', 'tagjoin', 'urlextract',
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'urljoin', 'URLMatch']
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# Define True and False for Python < 2.2.
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import sys
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if sys.version_info[:3] < (2, 2, 0):
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exec "True = 1; False = 0"
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# -------------------------------------------------------------------
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# Globals
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# -------------------------------------------------------------------
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import re
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import shlex
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import string
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import urllib
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import urlparse
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import types
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# Translate text between these strings as plain text (not HTML).
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_IGNORE_TAGS = [('script', '/script'),
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('style', '/style')]
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# Special tags where we have to look for _END_X as part of the
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# HTML/XHTML parsing rules.
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_BEGIN_COMMENT = '<!--'
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_END_COMMENT = '-->'
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_BEGIN_CDATA = '<![CDATA['
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_END_CDATA = ']]>'
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# Mime types that can be parsed as HTML or HTML-like.
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_HTML_MIMETYPES = ['text/html', 'application/xhtml',
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'application/xhtml+xml', 'text/xml',
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'application/xml']
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# Mime types that can be parsed as CSS.
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_CSS_MIMETYPES = ['text/css']
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# -------------------------------------------------------------------
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# HTML <-> Data structure
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# -------------------------------------------------------------------
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def tagextract(doc):
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"""
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Convert HTML to data structure.
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Returns a list. HTML tags become C{(name, keyword_dict)} tuples
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within the list, while plain text becomes strings within the
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list. All tag names are lowercased and stripped of whitespace.
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Tags which end with forward slashes have a single forward slash
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placed at the end of their name, to indicate that they are XML
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unclosed tags.
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Example:
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>>> tagextract('<img src=hi.gif alt="hi">foo<br><br/></body>')
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[('img', {'src': 'hi.gif', 'alt': 'hi'}), 'foo',
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('br', {}), ('br/', {}), ('/body', {})]
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Text between C{'<script>'} and C{'<style>'} is rendered directly to
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plain text. This prevents rogue C{'<'} or C{'>'} characters from
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interfering with parsing.
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>>> tagextract('<script type="a"><blah>var x; </script>')
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[('script', {'type': 'a'}), '<blah>var x; ', ('/script', {})]
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Comment strings and XML directives are rendered as a single long
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tag with no attributes. The case of the tag "name" is not changed:
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>>> tagextract('<!-- blah -->')
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[('!-- blah --', {})]
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>>> tagextract('<?xml version="1.0" encoding="utf-8" ?>')
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[('?xml version="1.0" encoding="utf-8" ?', {})]
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>>> tagextract('<!DOCTYPE html PUBLIC etc...>')
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[('!DOCTYPE html PUBLIC etc...', {})]
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Greater-than and less-than characters occuring inside comments or
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CDATA blocks are correctly kept as part of the block:
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>>> tagextract('<!-- <><><><>>..> -->')
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[('!-- <><><><>>..> --', {})]
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>>> tagextract('<!CDATA[[><>><>]<> ]]>')
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[('!CDATA[[><>><>]<> ]]', {})]
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Note that if one modifies these tags, it is important to retain the
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C{"--"} (for comments) or C{"]]"} (for C{CDATA}) at the end of the
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tag name, so that output from L{tagjoin} will be correct HTML/XHTML.
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"""
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L = _full_tag_extract(doc)
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for i in range(len(L)):
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if isinstance(L[i], _TextTag):
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# _TextTag object.
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L[i] = L[i].text
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else:
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# _HTMLTag object.
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L[i] = (L[i].name, L[i].attrs)
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return L
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def _is_str(s):
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"""
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True iff s is a string (checks via duck typing).
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"""
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return hasattr(s, 'capitalize')
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def tagjoin(L):
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"""
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Convert data structure back to HTML.
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This reverses the L{tagextract} function.
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More precisely, if an HTML string is turned into a data structure,
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then back into HTML, the resulting string will be functionally
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equivalent to the original HTML.
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>>> tagjoin(tagextract(s))
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(string that is functionally equivalent to s)
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Three changes are made to the HTML by L{tagjoin}: tags are
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lowercased, C{key=value} pairs are sorted, and values are placed in
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double-quotes.
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"""
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if _is_str(L):
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raise ValueError('got string arg, expected non-string iterable')
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ans = []
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for item in L:
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# Check for string using duck typing.
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if _is_str(item):
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# Handle plain text.
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ans.append(item)
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elif item[0] == '--':
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# Handle closing comment.
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ans.append('-->')
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elif item[0] == '!--':
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# Handle opening comment.
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ans.append('<!--')
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else:
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# Handle regular HTML tag.
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(name, d) = item
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if name[-1:] == '/':
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rslash = ' /'
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name = name[:-1]
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else:
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rslash = ''
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tag_items = []
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items = d.items()
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items.sort()
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for (key, value) in items:
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if value != None:
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if '"' in value and "'" in value:
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raise ValueError('attribute value contains both single' +
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' and double quotes')
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elif '"' in value:
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tag_items.append(key + "='" + value + "'")
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else:
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tag_items.append(key + '="' + value + '"')
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else:
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tag_items.append(key)
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tag_items = ' '.join(tag_items)
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if tag_items != '':
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tag_items = ' ' + tag_items
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ans.append('<' + name + tag_items + rslash + '>')
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return ''.join(ans)
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def _enumerate(L):
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"""
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Like C{enumerate}, provided for compatibility with Python < 2.3.
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Returns a list instead of an iterator.
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"""
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return zip(range(len(L)), L)
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def _ignore_tag_index(s, i):
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"""
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Helper routine: Find index within C{_IGNORE_TAGS}, or C{-1}.
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If C{s[i:]} begins with an opening tag from C{_IGNORE_TAGS}, return
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the index. Otherwise, return C{-1}.
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"""
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for (j, (a, b)) in _enumerate(_IGNORE_TAGS):
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if s[i:i + len(a) + 1].lower() == '<' + a:
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return j
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return - 1
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def _html_split(s):
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"""
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Helper routine: Split string into a list of tags and non-tags.
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>>> html_split(' blah <tag text> more </tag stuff> ')
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[' blah ', '<tag text>', ' more ', '</tag stuff>', ' ']
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Tags begin with C{'<'} and end with C{'>'}.
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The identity C{''.join(L) == s} is always satisfied.
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Exceptions to the normal parsing of HTML tags:
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C{'<script>'}, C{'<style>'}, and HTML comment tags ignore all HTML
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until the closing pair, and are added as three elements:
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>>> html_split(' blah<style><<<><></style><!-- hi -->' +
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... ' <script language="Javascript"></>a</script>end')
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[' blah', '<style>', '<<<><>', '</style>', '<!--', ' hi ', '-->',
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' ', '<script language="Javascript">', '</>a', '</script>', 'end']
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"""
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s_lower = s.lower()
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L = []
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i = 0 # Index of char being processed
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while i < len(s):
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c = s[i]
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if c == '<':
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# Left bracket, handle various cases.
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if s[i:i + len(_BEGIN_COMMENT)].startswith(_BEGIN_COMMENT):
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# HTML begin comment tag, '<!--'. Scan for '-->'.
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i2 = s.find(_END_COMMENT, i)
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if i2 < 0:
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# No '-->'. Append the remaining malformed content and stop.
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L.append(s[i:])
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break
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else:
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# Append the comment.
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L.append(s[i:i2 + len(_END_COMMENT)])
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i = i2 + len(_END_COMMENT)
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elif s[i:i + len(_BEGIN_CDATA)].startswith(_BEGIN_CDATA):
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# XHTML begin CDATA tag. Scan for ']]>'.
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i2 = s.find(_END_CDATA, i)
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if i2 < 0:
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# No ']]>'. Append the remaining malformed content and stop.
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L.append(s[i:])
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break
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else:
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# Append the CDATA.
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L.append(s[i:i2 + len(_END_CDATA)])
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i = i2 + len(_END_CDATA)
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else:
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# Regular HTML tag. Scan for '>'.
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orig_i = i
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found = False
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in_quot1 = False
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in_quot2 = False
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for i2 in xrange(i + 1, len(s)):
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c2 = s[i2]
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if c2 == '"' and not in_quot1:
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in_quot2 = not in_quot2
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# Only turn on double quote if it's in a realistic place.
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if in_quot2 and not in_quot1:
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if i2 > 0 and s[i2 - 1] not in [' ', '\t', '=']:
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in_quot2 = False
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elif c2 == "'" and not in_quot2:
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in_quot1 = not in_quot1
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# Only turn on single quote if it's in a realistic place.
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if in_quot1 and not in_quot2:
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if i2 > 0 and s[i2 - 1] not in [' ', '\t', '=']:
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in_quot1 = False
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elif c2 == '>' and (not in_quot2 and not in_quot1):
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found = True
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break
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if not found:
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# No end '>'. Append the rest as text.
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L.append(s[i:])
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break
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else:
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# Append the tag.
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L.append(s[i:i2 + 1])
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i = i2 + 1
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# Check whether we found a special ignore tag, eg '<script>'
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tagi = _ignore_tag_index(s, orig_i)
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if tagi >= 0:
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# It's an ignore tag. Scan for the end tag.
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i2 = s_lower.find('<' + _IGNORE_TAGS[tagi][1], i)
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if i2 < 0:
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# No end tag. Append the rest as text.
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L.append(s[i2:])
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break
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else:
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# Append the text sandwiched between the tags.
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L.append(s[i:i2])
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# Catch the closing tag with the next loop iteration.
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i = i2
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else:
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# Not a left bracket, append text up to next left bracket.
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i2 = s.find('<', i)
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if i2 < 0:
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# No left brackets, append the rest as text.
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L.append(s[i:])
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break
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else:
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L.append(s[i:i2])
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i = i2
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return L
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def _shlex_split(s):
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"""
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Like C{shlex.split}, but reversible, and for HTML.
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Splits a string into a list C{L} of strings. List elements
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contain either an HTML tag C{name=value} pair, an HTML name
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singleton (eg C{"checked"}), or whitespace.
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The identity C{''.join(L) == s} is always satisfied.
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>>> _shlex_split('a=5 b="15" name="Georgette A"')
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['a=5', ' ', 'b="15"', ' ', 'name="Georgette A"']
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>>> _shlex_split('a = a5 b=#b19 name="foo bar" q="hi"')
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['a = a5', ' ', 'b=#b19', ' ', 'name="foo bar"', ' ', 'q="hi"']
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>>> _shlex_split('a="9"b="15"')
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['a="9"', 'b="15"']
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"""
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ans = []
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i = 0
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while i < len(s):
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c = s[i]
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if c in string.whitespace:
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# Whitespace. Add whitespace while found.
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for i2 in range(i, len(s)):
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if s[i2] not in string.whitespace:
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break
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# Include the entire string if the last char is whitespace.
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if s[i2] in string.whitespace:
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i2 += 1
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ans.append(s[i:i2])
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i = i2
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else:
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# Match 'name = "value"'
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c = re.compile(r'[^ \t\n\r\f\v"\']+\s*\=\s*"[^"]*"')
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m = c.match(s, i)
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if m:
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ans.append(s[i:m.end()])
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i = m.end()
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continue
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# Match "name = 'value'"
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c = re.compile(r'[^ \t\n\r\f\v"\']+\s*\=\s*\'[^\']*\'')
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m = c.match(s, i)
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if m:
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ans.append(s[i:m.end()])
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i = m.end()
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continue
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# Match 'name = value'
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c = re.compile(r'[^ \t\n\r\f\v"\']+\s*\=\s*[^ \t\n\r\f\v"\']*')
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m = c.match(s, i)
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if m:
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ans.append(s[i:m.end()])
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i = m.end()
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continue
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# Match 'name'
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c = re.compile(r'[^ \t\n\r\f\v"\']+')
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m = c.match(s, i)
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if m:
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ans.append(s[i:m.end()])
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i = m.end()
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continue
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# Couldn't match anything so far, so it's likely that the page
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# has malformed quotes inside a tag. Add leading quotes
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# and spaces to the previous field until we see something.
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subadd = []
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while i < len(s) and s[i] in ['"', "'", ' ', '\t']:
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subadd.append(s[i])
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i += 1
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# Add whatever we could salvage from the situation and move on.
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if len(subadd) > 0:
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ans.append(''.join(subadd))
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else:
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# We totally failed at matching this character, so add it
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# as a separate item and move on.
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ans.append(s[i])
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return ans
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|
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def _test_shlex_split():
|
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"""
|
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Unit test for L{_shlex_split}.
|
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"""
|
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assert _shlex_split('') == []
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assert _shlex_split(' ') == [' ']
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assert _shlex_split('a=5 b="15" name="Georgette A"') == \
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['a=5', ' ', 'b="15"', ' ', 'name="Georgette A"']
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assert _shlex_split('a=cvn b=32vsd c= 234jk\te d \t="hi"') == \
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['a=cvn', ' ', 'b=32vsd', ' ', 'c= 234jk', '\t', 'e', ' ',
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'd \t="hi"']
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assert _shlex_split(' a b c d=e f g h i="jk" l mno = p ' + \
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'qr = "st"') == \
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[' ', 'a', ' ', 'b', ' ', 'c', ' ', 'd=e', ' ', 'f', ' ', \
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'g', ' ', 'h', ' ', 'i="jk"', ' ', 'l', ' ', 'mno = p', \
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' ', 'qr = "st"']
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assert _shlex_split('a=5 b="9"c="15 dfkdfkj "d="25"') == \
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['a=5', ' ', 'b="9"', 'c="15 dfkdfkj "', 'd="25"']
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assert _shlex_split('a=5 b="9"c="15 dfkdfkj "d="25" e=4') == \
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['a=5', ' ', 'b="9"', 'c="15 dfkdfkj "', 'd="25"', ' ', \
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'e=4']
|
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assert _shlex_split('a=5 b=\'9\'c=\'15 dfkdfkj \'d=\'25\' e=4') == \
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['a=5', ' ', 'b=\'9\'', 'c=\'15 dfkdfkj \'', 'd=\'25\'', \
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' ', 'e=4']
|
|
|
|
|
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def _tag_dict(s):
|
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"""
|
|
Helper routine: Extracts a dict from an HTML tag string.
|
|
|
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>>> _tag_dict('bgcolor=#ffffff text="#000000" blink')
|
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({'bgcolor':'#ffffff', 'text':'#000000', 'blink': None},
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{'bgcolor':(0,7), 'text':(16,20), 'blink':(31,36)},
|
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{'bgcolor':(8,15), 'text':(22,29), 'blink':(36,36)})
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|
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Returns a 3-tuple. First element is a dict of
|
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C{(key, value)} pairs from the HTML tag. Second element
|
|
is a dict mapping keys to C{(start, end)} indices of the
|
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key in the text. Third element maps keys to C{(start, end)}
|
|
indices of the value in the text.
|
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|
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Names are lowercased.
|
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|
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Raises C{ValueError} for unmatched quotes and other errors.
|
|
"""
|
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d = _shlex_split(s)
|
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attrs = {}
|
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key_pos = {}
|
|
value_pos = {}
|
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start = 0
|
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for item in d:
|
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end = start + len(item)
|
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equals = item.find('=')
|
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if equals >= 0:
|
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# Contains an equals sign.
|
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(k1, k2) = (start, start + equals)
|
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(v1, v2) = (start + equals + 1, start + len(item))
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|
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# Strip spaces.
|
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while k1 < k2 and s[k1] in string.whitespace: k1 += 1
|
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while k1 < k2 and s[k2 - 1] in string.whitespace: k2 -= 1
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|
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while v1 < v2 and s[v1] in string.whitespace: v1 += 1
|
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while v1 < v2 and s[v2 - 1] in string.whitespace: v2 -= 1
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|
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# Strip one pair of double quotes around value.
|
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if v1 < v2 - 1 and s[v1] == '"' and s[v2 - 1] == '"':
|
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v1 += 1
|
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v2 -= 1
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|
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# Strip one pair of single quotes around value.
|
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if v1 < v2 - 1 and s[v1] == "'" and s[v2 - 1] == "'":
|
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v1 += 1
|
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v2 -= 1
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|
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(key, value) = (s[k1:k2].lower(), s[v1:v2])
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|
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# Drop bad keys and values.
|
|
if '"' in key or "'" in key:
|
|
continue
|
|
if '"' in value and "'" in value:
|
|
continue
|
|
|
|
attrs[key] = value
|
|
key_pos[key] = (k1, k2)
|
|
value_pos[key] = (v1, v2)
|
|
elif item.split() == []:
|
|
# Whitespace. Ignore it.
|
|
pass
|
|
else:
|
|
# A single token, like 'blink'.
|
|
key = item.lower()
|
|
|
|
# Drop bad keys.
|
|
if '"' in key or "'" in key:
|
|
continue
|
|
|
|
attrs[key] = None
|
|
key_pos[key] = (start, end)
|
|
value_pos[key] = (end, end)
|
|
start = end
|
|
|
|
return (attrs, key_pos, value_pos)
|
|
|
|
def _test_tag_dict():
|
|
"""
|
|
Unit test for L{_tag_dict}.
|
|
"""
|
|
assert _tag_dict('') == ({}, {}, {})
|
|
assert _tag_dict(' \t\r \n\n \r\n ') == ({}, {}, {})
|
|
assert _tag_dict('bgcolor=#ffffff text="#000000" blink') == \
|
|
({'bgcolor':'#ffffff', 'text':'#000000', 'blink': None},
|
|
{'bgcolor':(0, 7), 'text':(16, 20), 'blink':(31, 36)},
|
|
{'bgcolor':(8, 15), 'text':(22, 29), 'blink':(36, 36)})
|
|
assert _tag_dict("bgcolor='#ffffff'text='#000000' blink") == \
|
|
({'bgcolor':'#ffffff', 'text':'#000000', 'blink': None},
|
|
{'bgcolor':(0, 7), 'text':(17, 21), 'blink':(32, 37)},
|
|
{'bgcolor':(9, 16), 'text':(23, 30), 'blink':(37, 37)})
|
|
s = ' \r\nbg = val text \t= "hi you" name\t e="5"\t\t\t\n'
|
|
(a, b, c) = _tag_dict(s)
|
|
assert a == {'text': 'hi you', 'bg': 'val', 'e': '5', 'name': None}
|
|
for key in a.keys():
|
|
assert s[b[key][0]:b[key][1]] == key
|
|
if a[key] != None:
|
|
assert s[c[key][0]:c[key][1]] == a[key]
|
|
|
|
def _full_tag_extract(s):
|
|
"""
|
|
Like L{tagextract}, but different return format.
|
|
|
|
Returns a list of L{_HTMLTag} and L{_TextTag} instances.
|
|
|
|
The return format is very inconvenient for manipulating HTML, and
|
|
only will be useful if you want to find the exact locations where
|
|
tags occur in the original HTML document.
|
|
"""
|
|
L = _html_split(s)
|
|
|
|
# Starting position of each L[i] in s.
|
|
Lstart = [0] * len(L)
|
|
for i in range(1, len(L)):
|
|
Lstart[i] = Lstart[i - 1] + len(L[i - 1])
|
|
|
|
class NotTagError(Exception): pass
|
|
|
|
for (i, text) in _enumerate(L):
|
|
try:
|
|
|
|
# Is it an HTML tag?
|
|
is_tag = False
|
|
if len(text) >= 2 and text[0] == '<' and text[-1] == '>':
|
|
# Turn HTML tag text into (name, keyword_dict) tuple.
|
|
is_tag = True
|
|
|
|
is_special = False
|
|
if len(text) >= 2 and (text[1] == '!' or text[1] == '?'):
|
|
is_special = True
|
|
|
|
if is_special:
|
|
# A special tag such as XML directive or <!-- comment -->
|
|
pos = (Lstart[i], Lstart[i] + len(L[i]))
|
|
|
|
# Wrap inside an _HTMLTag object.
|
|
L[i] = _HTMLTag(pos, text[1:-1].strip(), {}, {}, {})
|
|
|
|
elif is_tag:
|
|
# If an HTML tag, strip brackets and handle what's left.
|
|
|
|
# Strip off '<>' and update offset.
|
|
orig_offset = 0
|
|
if len(text) >= 1 and text[0] == '<':
|
|
text = text[1:]
|
|
orig_offset = 1
|
|
if len(text) >= 1 and text[-1] == '>':
|
|
text = text[:-1]
|
|
|
|
if len(text) > 0 and text[-1] == '/':
|
|
rslash = True
|
|
text = text[:-1]
|
|
else:
|
|
rslash = False
|
|
|
|
m = re.search(r'\s', text)
|
|
first_space = -1
|
|
if m:
|
|
first_space = m.start()
|
|
if first_space < 0:
|
|
(name, dtext) = (text, '')
|
|
else:
|
|
name = text[:first_space]
|
|
dtext = text[first_space + 1:len(text)]
|
|
|
|
# Position of dtext relative to original text.
|
|
dtext_offset = len(name) + 1 + orig_offset # +1 for space.
|
|
|
|
# Lowercase everything except XML directives and comments.
|
|
if not name.startswith('!') and not name.startswith('?'):
|
|
name = name.strip().lower()
|
|
|
|
if rslash:
|
|
name += '/'
|
|
|
|
# Strip off spaces, and update dtext_offset as appropriate.
|
|
orig_dtext = dtext
|
|
dtext = dtext.strip()
|
|
dtext_offset += orig_dtext.index(dtext)
|
|
|
|
(attrs, key_pos, value_pos) = _tag_dict(dtext)
|
|
# Correct offsets in key_pos and value_pos.
|
|
for key in attrs.keys():
|
|
key_pos[key] = (key_pos[key][0] + Lstart[i] + dtext_offset,
|
|
key_pos[key][1] + Lstart[i] + dtext_offset)
|
|
value_pos[key] = (value_pos[key][0] + Lstart[i] + dtext_offset,
|
|
value_pos[key][1] + Lstart[i] + dtext_offset)
|
|
|
|
pos = (Lstart[i], Lstart[i] + len(L[i]))
|
|
|
|
# Wrap inside an _HTMLTag object.
|
|
L[i] = _HTMLTag(pos, name, attrs, key_pos, value_pos)
|
|
else:
|
|
# Not an HTML tag.
|
|
raise NotTagError
|
|
except NotTagError:
|
|
# Wrap non-HTML strings inside a _TextTag object.
|
|
pos = (Lstart[i], Lstart[i] + len(L[i]))
|
|
L[i] = _TextTag(pos, L[i])
|
|
|
|
return L
|
|
|
|
|
|
class _HTMLTag:
|
|
"""
|
|
HTML tag extracted by L{_full_tag_extract}.
|
|
|
|
@ivar pos: C{(start, end)} indices of the entire tag in the
|
|
HTML document.
|
|
@ivar name: Name of tag. For example, C{'img'}.
|
|
@ivar attrs: Dictionary mapping tag attributes to corresponding
|
|
tag values.
|
|
|
|
Example:
|
|
|
|
>>> tag = _full_tag_extract('<a href="d.com">')[0]
|
|
>>> tag.attrs
|
|
{'href': 'd.com'}
|
|
|
|
Surrounding quotes are stripped from the values.
|
|
@ivar key_pos: Key position dict.
|
|
|
|
Maps the name of a tag attribute to C{(start, end)}
|
|
indices for the key string in the C{"key=value"}
|
|
HTML pair. Indices are absolute, where 0 is the
|
|
start of the HTML document.
|
|
|
|
Example:
|
|
|
|
>>> tag = _full_tag_extract('<a href="d.com">')[0]
|
|
>>> tag.key_pos['href']
|
|
(3, 7)
|
|
>>> '<a href="d.com">'[3:7]
|
|
'href'
|
|
|
|
@ivar value_pos: Value position dict.
|
|
|
|
Maps the name of a tag attribute to C{(start, end)}
|
|
indices for the value in the HTML document string.
|
|
Surrounding quotes are excluded from this range.
|
|
Indices are absolute, where 0 is the start of the
|
|
HTML document.
|
|
|
|
Example:
|
|
|
|
>>> tag = _full_tag_extract('<a href="d.com">')[0]
|
|
>>> tag.value_pos['href']
|
|
(9, 14)
|
|
>>> '<a href="d.com">'[9:14]
|
|
'd.com'
|
|
"""
|
|
|
|
def __init__(self, pos, name, attrs, key_pos, value_pos):
|
|
"""
|
|
Create an _HTMLTag object.
|
|
"""
|
|
self.pos = pos
|
|
self.name = name
|
|
self.attrs = attrs
|
|
self.key_pos = key_pos
|
|
self.value_pos = value_pos
|
|
|
|
class _TextTag:
|
|
"""
|
|
Text extracted from an HTML document by L{_full_tag_extract}.
|
|
|
|
@ivar text: Extracted text.
|
|
@ivar pos: C{(start, end)} indices of the text.
|
|
"""
|
|
|
|
def __init__(self, pos, text):
|
|
"""
|
|
Create a _TextTag object.
|
|
"""
|
|
self.pos = pos
|
|
self.text = text
|
|
|
|
# -------------------------------------------------------------------
|
|
# URL Editing
|
|
# -------------------------------------------------------------------
|
|
|
|
# Tags within which URLs may be found.
|
|
_URL_TAGS = ['a href', 'applet archive', 'applet code',
|
|
'applet codebase', 'area href', 'base href',
|
|
'blockquote cite', 'body background', 'del cite',
|
|
'form action', 'frame longdesc', 'frame src',
|
|
'head profile', 'iframe src', 'iframe longdesc',
|
|
'img src', 'img ismap', 'img longdesc', 'img usemap',
|
|
'input src', 'ins cite', 'link href', 'object archive',
|
|
'object codebase', 'object data', 'object usemap',
|
|
'script src', 'table background', 'tbody background',
|
|
'td background', 'tfoot background', 'th background',
|
|
'thead background', 'tr background']
|
|
_URL_TAGS = map(lambda s: tuple(s.split()), _URL_TAGS)
|
|
|
|
|
|
def _finditer(pattern, string):
|
|
"""
|
|
Like C{re.finditer}, provided for compatibility with Python < 2.3.
|
|
|
|
Returns a list instead of an iterator. Otherwise the return format
|
|
is identical to C{re.finditer} (except possibly in the details of
|
|
empty matches).
|
|
"""
|
|
compiled = re.compile(pattern)
|
|
ans = []
|
|
start = 0
|
|
|
|
while True:
|
|
m = compiled.search(string, start)
|
|
if m:
|
|
ans.append(m)
|
|
else:
|
|
return ans
|
|
|
|
m_start = m.start(m.lastindex)
|
|
m_end = m.end(m.lastindex)
|
|
if m_end > m_start:
|
|
start = m_end
|
|
else:
|
|
start += 1
|
|
|
|
def _remove_comments(doc):
|
|
"""
|
|
Replaces commented out characters with spaces in a CSS document.
|
|
"""
|
|
ans = []
|
|
i = 0
|
|
while True:
|
|
i2 = doc.find('/*', i)
|
|
if i2 < 0:
|
|
ans += [doc[i:]]
|
|
break
|
|
ans += [doc[i:i2]]
|
|
i3 = doc.find('*/', i2 + 1)
|
|
if i3 < 0:
|
|
i3 = len(doc) - 2
|
|
ans += [' ' * (i3 - i2 + 2)]
|
|
i = i3 + 2
|
|
|
|
return ''.join(ans)
|
|
|
|
def _test_remove_comments():
|
|
"""
|
|
Unit test for L{_remove_comments}.
|
|
"""
|
|
s = '/*d s kjlsdf */*//*/*//**/**/*//**/a' * 50
|
|
assert len(_remove_comments(s)) == len(s)
|
|
s = '/**/' * 50 + '/*5845*/*/*//*/**/dfd' + '/*//**//'
|
|
assert len(_remove_comments(s)) == len(s)
|
|
s = 'a/**/' * 50 + '/**//**/////***/****/*//**//*/' * 5
|
|
assert len(_remove_comments(s)) == len(s)
|
|
s = 'hi /* foo */ hello /* bar!!!!! \n\n */ there!'
|
|
assert _remove_comments(s) == \
|
|
'hi hello there!'
|
|
|
|
def urlextract(doc, siteurl=None, mimetype='text/html'):
|
|
"""
|
|
Extract URLs from HTML or stylesheet.
|
|
|
|
Extracts only URLs that are linked to or embedded in the document.
|
|
Ignores plain text URLs that occur in the non-HTML part of the
|
|
document.
|
|
|
|
Returns a list of L{URLMatch} objects.
|
|
|
|
>>> L = urlextract('<img src="a.gif"><a href="www.google.com">')
|
|
>>> L[0].url
|
|
'a.gif'
|
|
>>> L[1].url
|
|
'www.google.com'
|
|
|
|
If C{siteurl} is specified, all URLs are made into absolute URLs
|
|
by assuming that C{doc} is located at the URL C{siteurl}.
|
|
|
|
>>> doc = '<img src="a.gif"><a href="/b.html">'
|
|
>>> L = urlextract(doc, 'http://www.python.org/~guido/')
|
|
>>> L[0].url
|
|
'http://www.python.org/~guido/a.gif'
|
|
>>> L[1].url
|
|
'http://www.python.org/b.html'
|
|
|
|
If C{mimetype} is C{"text/css"}, the document will be parsed
|
|
as a stylesheet.
|
|
|
|
If a stylesheet is embedded inside an HTML document, then
|
|
C{urlextract} will extract the URLs from both the HTML and the
|
|
stylesheet.
|
|
"""
|
|
mimetype = mimetype.lower()
|
|
if mimetype.split()[0] in _CSS_MIMETYPES:
|
|
doc = _remove_comments(doc)
|
|
# Match URLs within CSS stylesheet.
|
|
# Match url(blah) or url('blah') or url("blah").
|
|
L = _finditer(
|
|
r'''url\s*\(([^\r\n\("']*?)\)|''' +
|
|
r'''url\s*\(\s*"([^\r\n]*?)"\s*\)|''' +
|
|
r'''url\s*\(\s*'([^\r\n]*?)'\s*\)|''' +
|
|
r'''@import\s+([^ \t\r\n"';@\(\)]+)[^\r\n;@\(\)]*[\r\n;]|''' +
|
|
r'''@import\s+'([^ \t\r\n"';@\(\)]+)'[^\r\n;@\(\)]*[\r\n;]|''' +
|
|
r'''@import\s+"([^ \t\r\n"';\(\)']+)"[^\r\n;@\(\)]*[\r\n;]''',
|
|
doc + ';\n')
|
|
|
|
L = [(x.start(x.lastindex), x.end(x.lastindex)) for x in L]
|
|
ans = []
|
|
for (s, e) in L:
|
|
e = min(e, len(doc))
|
|
if e > s:
|
|
ans.append(URLMatch(doc, s, e, siteurl, False, True))
|
|
elif mimetype.split()[0] in _HTML_MIMETYPES:
|
|
# Match URLs within HTML document.
|
|
ans = []
|
|
L = _full_tag_extract(doc)
|
|
item = None
|
|
for i in range(len(L)):
|
|
prev_item = item
|
|
item = L[i]
|
|
|
|
# Handle string item (text) or tuple item (tag).
|
|
if isinstance(item, _TextTag):
|
|
# Current item is text.
|
|
if isinstance(prev_item, _HTMLTag) and prev_item.name == \
|
|
'style':
|
|
# And previous item is <style>. Process a stylesheet.
|
|
temp = urlextract(item.text, siteurl, 'text/css')
|
|
# Offset indices and add to ans.
|
|
for j in range(len(temp)):
|
|
temp[j].start += item.pos[0]
|
|
temp[j].end += item.pos[0]
|
|
ans += temp
|
|
else:
|
|
# Regular text. Ignore.
|
|
pass
|
|
else:
|
|
# Current item is a tag.
|
|
if item.attrs.has_key('style'):
|
|
# Process a stylesheet embedded in the 'style' attribute.
|
|
temp = urlextract(item.attrs['style'], siteurl, 'text/css')
|
|
# Offset indices and add to ans.
|
|
for j in range(len(temp)):
|
|
temp[j].start += item.value_pos['style'][0]
|
|
temp[j].end += item.value_pos['style'][0]
|
|
ans += temp
|
|
|
|
for (a, b) in _URL_TAGS:
|
|
if item.name.startswith(a) and b in item.attrs.keys():
|
|
# Got one URL.
|
|
url = item.attrs[b]
|
|
# FIXME: Some HTML tag wants a URL list, look up which
|
|
# tag and make it a special case.
|
|
(start, end) = item.value_pos[b]
|
|
tag_name = a
|
|
tag_attr = b
|
|
tag_attrs = item.attrs
|
|
tag_index = i
|
|
tag = URLMatch(doc, start, end, siteurl, True, False, \
|
|
tag_attr, tag_attrs, tag_index, tag_name)
|
|
ans.append(tag)
|
|
# End of 'text/html' mimetype case.
|
|
else:
|
|
raise ValueError('unknown MIME type: ' + repr(mimetype))
|
|
|
|
# Filter the answer, removing duplicate matches.
|
|
start_end_map = {}
|
|
filtered_ans = []
|
|
for item in ans:
|
|
if not start_end_map.has_key((item.start, item.end)):
|
|
start_end_map[(item.start, item.end)] = None
|
|
filtered_ans.append(item)
|
|
return filtered_ans
|
|
|
|
def _tuple_replace(s, Lindices, Lreplace):
|
|
"""
|
|
Replace slices of a string with new substrings.
|
|
|
|
Given a list of slice tuples in C{Lindices}, replace each slice
|
|
in C{s} with the corresponding replacement substring from
|
|
C{Lreplace}.
|
|
|
|
Example:
|
|
|
|
>>> _tuple_replace('0123456789',[(4,5),(6,9)],['abc', 'def'])
|
|
'0123abc5def9'
|
|
"""
|
|
ans = []
|
|
Lindices = Lindices[:]
|
|
Lindices.sort()
|
|
if len(Lindices) != len(Lreplace):
|
|
raise ValueError('lists differ in length')
|
|
for i in range(len(Lindices) - 1):
|
|
if Lindices[i][1] > Lindices[i + 1][0]:
|
|
raise ValueError('tuples overlap')
|
|
if Lindices[i][1] < Lindices[i][0]:
|
|
raise ValueError('invalid tuple')
|
|
if min(Lindices[i][0], Lindices[i][1]) < 0 or \
|
|
max(Lindices[i][0], Lindices[i][1]) >= len(s):
|
|
raise ValueError('bad index')
|
|
|
|
j = 0
|
|
offset = 0
|
|
for i in range(len(Lindices)):
|
|
|
|
len1 = Lindices[i][1] - Lindices[i][0]
|
|
len2 = len(Lreplace[i])
|
|
|
|
ans.append(s[j:Lindices[i][0] + offset])
|
|
ans.append(Lreplace[i])
|
|
|
|
j = Lindices[i][1]
|
|
ans.append(s[j:])
|
|
return ''.join(ans)
|
|
|
|
def _test_tuple_replace():
|
|
"""
|
|
Unit test for L{_tuple_replace}.
|
|
"""
|
|
assert _tuple_replace('', [], []) == ''
|
|
assert _tuple_replace('0123456789', [], []) == '0123456789'
|
|
assert _tuple_replace('0123456789', [(4, 5), (6, 9)], ['abc', 'def']) == \
|
|
'0123abc5def9'
|
|
assert _tuple_replace('01234567890123456789', \
|
|
[(1, 9), (13, 14), (16, 18)], ['abcd', 'efg', 'hijk']) == \
|
|
'0abcd9012efg45hijk89'
|
|
|
|
def urljoin(s, L):
|
|
"""
|
|
Write back document with modified URLs (reverses L{urlextract}).
|
|
|
|
Given a list C{L} of L{URLMatch} objects obtained from
|
|
L{urlextract}, substitutes changed URLs into the original
|
|
document C{s}, and returns the modified document.
|
|
|
|
One should only modify the C{.url} attribute of the L{URLMatch}
|
|
objects. The ordering of the URLs in the list is not important.
|
|
|
|
>>> doc = '<img src="a.png"><a href="b.png">'
|
|
>>> L = urlextract(doc)
|
|
>>> L[0].url = 'foo'
|
|
>>> L[1].url = 'bar'
|
|
>>> urljoin(doc, L)
|
|
'<img src="foo"><a href="bar">'
|
|
|
|
"""
|
|
return _tuple_replace(s, [(x.start, x.end) for x in L], \
|
|
[x.url for x in L])
|
|
|
|
|
|
def examples():
|
|
"""
|
|
Examples of the C{htmldata} module.
|
|
|
|
Example 1:
|
|
Print all absolutized URLs from Google.
|
|
|
|
Here we use L{urlextract} to obtain all URLs in the document.
|
|
|
|
>>> import urllib2, htmldata
|
|
>>> url = 'http://www.google.com/'
|
|
>>> contents = urllib2.urlopen(url).read()
|
|
>>> for u in htmldata.urlextract(contents, url):
|
|
... print u.url
|
|
...
|
|
http://www.google.com/images/logo.gif
|
|
http://www.google.com/search
|
|
(More output)
|
|
|
|
Note that the second argument to L{urlextract} causes the
|
|
URLs to be made absolute with respect to that base URL.
|
|
|
|
Example 2:
|
|
Print all image URLs from Google in relative form.
|
|
|
|
|
|
>>> import urllib2, htmldata
|
|
>>> url = 'http://www.google.com/'
|
|
>>> contents = urllib2.urlopen(url).read()
|
|
>>> for u in htmldata.urlextract(contents):
|
|
... if u.tag_name == 'img':
|
|
... print u.url
|
|
...
|
|
/images/logo.gif
|
|
|
|
Equivalently, one can use L{tagextract}, and look for occurrences
|
|
of C{<img>} tags. The L{urlextract} function is mostly a convenience
|
|
function for when one wants to extract and/or modify all URLs in a
|
|
document.
|
|
|
|
Example 3:
|
|
Replace all C{<a href>} links on Google with the Microsoft web page.
|
|
|
|
Here we use L{tagextract} to turn the HTML into a data structure,
|
|
and then loop over the in-order list of tags (items which are not
|
|
tuples are plain text, which is ignored).
|
|
|
|
>>> import urllib2, htmldata
|
|
>>> url = 'http://www.google.com/'
|
|
>>> contents = urllib2.urlopen(url).read()
|
|
>>> L = htmldata.tagextract(contents)
|
|
>>> for item in L:
|
|
... if isinstance(item, tuple) and item[0] == 'a':
|
|
... # It's an HTML <a> tag! Give it an href=.
|
|
... item[1]['href'] = 'http://www.microsoft.com/'
|
|
...
|
|
>>> htmldata.tagjoin(L)
|
|
(Microsoftized version of Google)
|
|
|
|
Example 4:
|
|
Make all URLs on an HTML document be absolute.
|
|
|
|
>>> import urllib2, htmldata
|
|
>>> url = 'http://www.google.com/'
|
|
>>> contents = urllib2.urlopen(url).read()
|
|
>>> htmldata.urljoin(htmldata.urlextract(contents, url))
|
|
(Google HTML page with absolute URLs)
|
|
|
|
Example 5:
|
|
Properly quote all HTML tag values for pedants.
|
|
|
|
>>> import urllib2, htmldata
|
|
>>> url = 'http://www.google.com/'
|
|
>>> contents = urllib2.urlopen(url).read()
|
|
>>> htmldata.tagjoin(htmldata.tagextract(contents))
|
|
(Properly quoted version of the original HTML)
|
|
|
|
Example 6:
|
|
Modify all URLs in a document so that they are appended
|
|
to our proxy CGI script C{http://mysite.com/proxy.cgi}.
|
|
|
|
>>> import urllib2, htmldata
|
|
>>> url = 'http://www.google.com/'
|
|
>>> contents = urllib2.urlopen(url).read()
|
|
>>> proxy_url = 'http://mysite.com/proxy.cgi?url='
|
|
>>> L = htmldata.urlextract(contents)
|
|
>>> for u in L:
|
|
... u.url = proxy_url + u.url
|
|
...
|
|
>>> htmldata.urljoin(L)
|
|
(Document with all URLs wrapped in our proxy script)
|
|
|
|
Example 7:
|
|
Download all images from a website.
|
|
|
|
>>> import urllib, htmldata, time
|
|
>>> url = 'http://www.google.com/'
|
|
>>> contents = urllib.urlopen(url).read()
|
|
>>> for u in htmldata.urlextract(contents, url):
|
|
... if u.tag_name == 'img':
|
|
... filename = urllib.quote_plus(u.url)
|
|
... urllib.urlretrieve(u.url, filename)
|
|
... time.sleep(0.5)
|
|
...
|
|
(Images are downloaded to the current directory)
|
|
|
|
Many sites will protect against bandwidth-draining robots by
|
|
checking the HTTP C{Referer} [sic] and C{User-Agent} fields.
|
|
To circumvent this, one can create a C{urllib2.Request} object
|
|
with a legitimate C{Referer} and a C{User-Agent} such as
|
|
C{"Mozilla/4.0 (compatible; MSIE 5.5)"}. Then use
|
|
C{urllib2.urlopen} to download the content. Be warned that some
|
|
website operators will respond to rapid robot requests by banning
|
|
the offending IP address.
|
|
|
|
"""
|
|
print examples.__doc__
|
|
|
|
class URLMatch:
|
|
"""
|
|
A matched URL inside an HTML document or stylesheet.
|
|
|
|
A list of C{URLMatch} objects is returned by L{urlextract}.
|
|
|
|
@ivar url: URL extracted.
|
|
@ivar start: Starting character index.
|
|
@ivar end: End character index.
|
|
@ivar in_html: C{True} if URL occurs within an HTML tag.
|
|
@ivar in_css: C{True} if URL occurs within a stylesheet.
|
|
@ivar tag_attr: Specific tag attribute in which URL occurs.
|
|
|
|
Example: C{'href'}.
|
|
C{None} if the URL does not occur within an HTML
|
|
tag.
|
|
@ivar tag_attrs: Dictionary of all tag attributes and values.
|
|
|
|
Example: C{{'src':'http://X','alt':'Img'}}.
|
|
C{None} if the URL does not occur within an HTML
|
|
tag.
|
|
@ivar tag_index: Index of the tag in the list that would be
|
|
generated by a call to L{tagextract}.
|
|
@ivar tag_name: HTML tag name in which URL occurs.
|
|
|
|
Example: C{'img'}.
|
|
C{None} if the URL does not occur within an HTML
|
|
tag.
|
|
|
|
"""
|
|
|
|
def __init__(self, doc, start, end, siteurl, in_html, in_css,
|
|
tag_attr=None, tag_attrs=None, tag_index=None,
|
|
tag_name=None):
|
|
"""
|
|
Create a URLMatch object.
|
|
"""
|
|
self.doc = doc
|
|
self.start = start
|
|
self.end = end
|
|
self.url = doc[start:end]
|
|
self.in_html = in_html
|
|
self.in_css = in_css
|
|
|
|
if siteurl != None:
|
|
self.url = urlparse.urljoin(siteurl, self.url)
|
|
|
|
self.tag_attr = tag_attr
|
|
self.tag_attrs = tag_attrs
|
|
self.tag_index = tag_index
|
|
self.tag_name = tag_name
|
|
|
|
|
|
def _cast_to_str(arg, str_class):
|
|
"""
|
|
Casts string components of several data structures to str_class.
|
|
|
|
Casts string, list of strings, or list of tuples (as returned by
|
|
L{tagextract}) such that all strings are made to type str_class.
|
|
"""
|
|
if _is_str(arg):
|
|
return str_class(arg)
|
|
elif isinstance(arg, types.ListType):
|
|
ans = []
|
|
for item in arg:
|
|
if _is_str(item):
|
|
ans.append(str_class(item))
|
|
elif isinstance(item, types.TupleType) and len(item) == 2:
|
|
(a, b) = item
|
|
b_prime = {}
|
|
for (b_key, b_value) in b.items():
|
|
if b_value is None:
|
|
b_prime[str_class(b_key)] = None
|
|
else:
|
|
b_prime[str_class(b_key)] = str_class(b_value)
|
|
ans.append((str_class(a), b_prime))
|
|
else:
|
|
raise ValueError('unknown argument type')
|
|
return ans
|
|
else:
|
|
raise ValueError('unknown argument type')
|
|
|
|
|
|
# -------------------------------------------------------------------
|
|
# Unit Tests: HTML <-> Data structure
|
|
# -------------------------------------------------------------------
|
|
|
|
def _test_tagextract(str_class=str):
|
|
"""
|
|
Unit tests for L{tagextract} and L{tagjoin}.
|
|
|
|
Strings are cast to the string class argument str_class.
|
|
"""
|
|
|
|
# Work around lack of nested scopes in Python <= 2.1.
|
|
def f(obj, str_class2=str_class):
|
|
return _cast_to_str(obj, str_class2)
|
|
|
|
# Simple HTML document to test.
|
|
doc1 = f('\n\n<Html><BODY bgcolor=#ffffff>Hi<h1>Ho</h1><br>' +
|
|
'<br /><img SRc="text%5f.gif"><TAG NOshow>' +
|
|
'<img test="5%ff" /></body></html>\nBye!\n')
|
|
doc2 = f('\r<HTML><!-- Comment<a href="blah"> --><hiYa><foo>' +
|
|
'<test tag="5" content=6><is broken=False><yay>' +
|
|
'<style><><>><</style><foo bar=5>end<!-- <!-- nested --> ' +
|
|
'<script language="JavaScript"><>!><!_!_!-->!_-></script>')
|
|
doc3 = f('\r\t< html >< tag> <!--comment--> <tag a = 5> ' +
|
|
'<foo \r\nbg = val text \t= "hi you" name\t e="5"\t\t\t\n>')
|
|
doc4 = f('<?xml ??><foo><!-- <img> --><!DOCTYPE blah""/>' +
|
|
'<![CDATA[ more and weirder<bar> ] ][]]><![C[DATA[[>' +
|
|
'<abc key=value><![CDATA[to eof')
|
|
doc5 = f('<a href="foobar/ \t="base="10" x="15"><a x="9"t="20">')
|
|
|
|
# -----------------------------------------------------------------
|
|
# Test _html_split()
|
|
# -----------------------------------------------------------------
|
|
|
|
s = doc1
|
|
assert s == f('').join(_html_split(s))
|
|
assert _html_split(s) == f(
|
|
['\n\n', '<Html>', '<BODY bgcolor=#ffffff>', 'Hi', '<h1>', 'Ho',
|
|
'</h1>', '<br>', '<br />', '<img SRc="text%5f.gif">',
|
|
'<TAG NOshow>', '<img test="5%ff" />', '</body>', '</html>',
|
|
'\nBye!\n'])
|
|
|
|
s = doc2
|
|
assert s == f('').join(_html_split(s))
|
|
|
|
# Test single quotes
|
|
s = doc2.replace(f('"'), f("'"))
|
|
assert s == f('').join(_html_split(s))
|
|
|
|
s = f('<!-- test weird comment <body> <html> --> <h1>Header' +
|
|
'</h1 value=10 a=11>')
|
|
assert s == f('').join(_html_split(s))
|
|
assert _html_split(s) == f(
|
|
['<!-- test weird comment <body> <html> -->', ' ',
|
|
'<h1>', 'Header', '</h1 value=10 a=11>'])
|
|
|
|
s = f('<!-- <!-- nested messed up --> blah ok <now> what<style>hi' +
|
|
'<><>></style><script language="Java"><aL><>><>></script>a')
|
|
assert s == f('').join(_html_split(s))
|
|
assert _html_split(s) == f(
|
|
['<!-- <!-- nested messed up -->', ' blah ok ', '<now>',
|
|
' what', '<style>', 'hi<><>>', '</style>',
|
|
'<script language="Java">', '<aL><>><>>', '</script>', 'a'])
|
|
|
|
s = f('<!-- ><# -->!<!-!._-><!-- aa--> <style><tag//</style> <tag ' +
|
|
'<tag <! <! -> <!-- </who< <who> tag> <huh-->-</style>' +
|
|
'</style<style>')
|
|
assert s == f('').join(_html_split(s))
|
|
assert _html_split(s) == f(
|
|
['<!-- ><# -->', '!', '<!-!._->', '<!-- aa-->',
|
|
' ', '<style>', '<tag//', '</style>', ' ', '<tag <tag <! <! ->',
|
|
' ', '<!-- </who< <who> tag> <huh-->', '-', '</style>',
|
|
'</style<style>'])
|
|
|
|
s = doc4
|
|
assert s == f('').join(_html_split(s))
|
|
assert _html_split(s) == f(
|
|
['<?xml ??>', '<foo>', '<!-- <img> -->', '<!DOCTYPE blah""/>',
|
|
'<![CDATA[ more and weirder<bar> ] ][]]>', '<![C[DATA[[>',
|
|
'<abc key=value>', '<![CDATA[to eof'])
|
|
|
|
# -----------------------------------------------------------------
|
|
# Test tagextract() and tagjoin()
|
|
# -----------------------------------------------------------------
|
|
|
|
# Test for whitespace handling in tags.
|
|
assert (tagextract('<a\n\t\t\t\v\rhref="a.png"\tsize=10>') ==
|
|
[('a', {'href': 'a.png', 'size': '10'})])
|
|
|
|
s = doc1
|
|
s2 = doc1.replace(f('"'), f("'")) # Test single quotes, too.
|
|
assert tagextract(f('')) == []
|
|
assert tagextract(s) == tagextract(s2) == \
|
|
f(['\n\n', ('html', {}), ('body', {'bgcolor': '#ffffff'}),
|
|
'Hi', ('h1', {}), 'Ho', ('/h1', {}), ('br', {}),
|
|
('br/', {}), ('img', {'src': 'text%5f.gif'}),
|
|
('tag', {'noshow': None}), ('img/', {'test': '5%ff'}),
|
|
('/body', {}), ('/html', {}), '\nBye!\n'])
|
|
s2 = f('\n\n<html><body bgcolor="#ffffff">Hi<h1>Ho</h1><br>' +
|
|
'<br /><img src="text%5f.gif"><tag noshow>' +
|
|
'<img test="5%ff" /></body></html>\nBye!\n')
|
|
assert tagjoin(tagextract(s)) == s2
|
|
|
|
|
|
doc2old = doc2
|
|
doc2 = f('\r<HTML><!-- Comment<a href="blah"> --><hiYa><foo>' +
|
|
'<test tag="5" content=6><is broken=False><yay>' +
|
|
'<style><><>><</style><foo bar=5>end<!-- <!-- nested --> ' +
|
|
'<script language="JavaScript"><>!><!_!_!-->!_-></script>')
|
|
assert doc2old == doc2
|
|
|
|
s = doc2
|
|
assert tagextract(s) == f(
|
|
['\r', ('html', {}), ('!-- Comment<a href="blah"> --', {}),
|
|
('hiya', {}), ('foo', {}),
|
|
('test', {'content': '6', 'tag': '5'}),
|
|
('is', {'broken': 'False'}), ('yay', {}), ('style', {}), '<><>><',
|
|
('/style', {}), ('foo', {'bar': '5'}), 'end',
|
|
('!-- <!-- nested --', {}), ' ',
|
|
('script', {'language': 'JavaScript'}), ('>!><!_!_!-->!_-', {}),
|
|
('/script', {})])
|
|
|
|
assert tagjoin(tagextract(s)) == f(
|
|
'\r<html><!-- Comment<a href="blah"> --><hiya><foo><test ' +
|
|
'content="6" tag="5"><is broken="False"><yay><style><><>><' +
|
|
'</style><foo bar="5">end<!-- <!-- nested --> ' +
|
|
'<script language="JavaScript"><>!><!_!_!-->!_-></script>')
|
|
|
|
s = doc5
|
|
assert tagextract(s) == f(
|
|
[('a', {'href':'foobar/ \t=', 'base':'10', 'x':'15'}),
|
|
('a', {'x':'9', 't':'20'})])
|
|
assert tagjoin(tagextract(s)) == f(
|
|
'<a base="10" href="foobar/ \t=" x="15"><a t="20" x="9">')
|
|
|
|
|
|
# -----------------------------------------------------------------
|
|
# Test _full_tag_extract()
|
|
# -----------------------------------------------------------------
|
|
|
|
for s in [doc1, doc2, doc3,
|
|
doc1.replace(f('"'), f("'")), doc2.replace(f('"'), f("'")),
|
|
doc3.replace(f('"'), f("'"))]:
|
|
L = _full_tag_extract(s)
|
|
for (i, item) in _enumerate(L):
|
|
if isinstance(item, _HTMLTag):
|
|
for key in item.attrs.keys():
|
|
assert s[item.key_pos[key][0]:item.key_pos[key][1]].lower()\
|
|
== key
|
|
if item.attrs[key] != None:
|
|
assert s[item.value_pos[key][0]:item.value_pos[key][1]] \
|
|
== item.attrs[key]
|
|
|
|
n = 1000
|
|
doc4 = f('<tag name = "5" value ="6afdjherknc4 cdk j" a="7" b=8/>')
|
|
doc4 *= n
|
|
L = tagextract(doc4)
|
|
assert len(L) == n
|
|
for i in range(n):
|
|
assert L[i] == f([('tag/', {'name':'5', 'value':'6afdjherknc4 cdk j',
|
|
'a':'7', 'b':'8'})])[0]
|
|
|
|
# -----------------------------------------------------------------
|
|
# Test tagextract() and tagjoin() with XML directives.
|
|
# -----------------------------------------------------------------
|
|
|
|
doc1 = f(
|
|
'a<?xml version="1.0"?>' +
|
|
'b<!DOCTYPE html' +
|
|
'PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"' +
|
|
'"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >c' +
|
|
'<html a=b><!-- Comment <><> hi! -->' +
|
|
'z<![CDATA[ some content ]]>rx' +
|
|
'<![C[DATA[ more and weirder ] ][]]>tt')
|
|
|
|
doc1join = f(
|
|
'a<?xml version="1.0"?>b<!DOCTYPE htmlPUBLIC "-//W3C//DTD ' +
|
|
'XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/' +
|
|
'xhtml1-transitional.dtd">c<html a="b"><!-- Comment <><> hi! ' +
|
|
'-->z<![CDATA[ some content ]]>rx<![C[DATA[ more and weirder ]' +
|
|
' ][]]>tt')
|
|
|
|
ans1 = f(
|
|
['a', ('?xml version="1.0"?', {}), 'b',
|
|
('!DOCTYPE html' +
|
|
'PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"' +
|
|
'"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"', {}),
|
|
'c', ('html', {'a':'b'}), ('!-- Comment <><> hi! --', {}), 'z',
|
|
('![CDATA[ some content ]]', {}), 'rx',
|
|
('![C[DATA[ more and weirder ] ][]]', {}), 'tt'])
|
|
|
|
assert (tagextract(f('<?xml version="1.0" encoding="utf-8" ?>')) ==
|
|
f([('?xml version="1.0" encoding="utf-8" ?', {})]))
|
|
assert (tagextract(f('<!DOCTYPE html PUBLIC etc...>')) ==
|
|
f([('!DOCTYPE html PUBLIC etc...', {})]))
|
|
|
|
assert tagextract(doc1) == ans1
|
|
|
|
assert tagjoin(tagextract(doc1)) == doc1join
|
|
|
|
|
|
# -------------------------------------------------------------------
|
|
# Unit Tests: URL Parsing
|
|
# -------------------------------------------------------------------
|
|
|
|
def _test_urlextract(str_class=str):
|
|
"""
|
|
Unit tests for L{urlextract} and L{urljoin}.
|
|
|
|
Strings are cast to the string class argument str_class.
|
|
"""
|
|
|
|
# Work around lack of nested scopes in Python <= 2.1.
|
|
def f(obj, str_class2=str_class):
|
|
return _cast_to_str(obj, str_class2)
|
|
|
|
doc1 = f('urlblah, url ( blah2, url( blah3) url(blah4) ' +
|
|
'url("blah5") hum("blah6") url)"blah7"( url ( " blah8 " );;')
|
|
doc2 = f('<html><img src="a.gif" alt="b"><a href = b.html name=' +
|
|
'"c"><td background = ./c.png width=100%><a value=/f.jpg>' +
|
|
'<img src="http://www.abc.edu/d.tga">http://www.ignore.us/' +
|
|
'\nhttp://www.nowhere.com <style>url(h.gif) ' +
|
|
'url(http://www.testdomain.com/) http://ignore.com/a' +
|
|
'</style><img alt="c" src = "a.gif"><img src=/i.png>')
|
|
doc3 = f('@import foo;\n@import bar\n@import url(\'foo2\');' +
|
|
'@import url(\'http://bar2\')\n@import\turl("foo!");' +
|
|
'@import \'foo3\'\n@import "bar3";\n@importfails;' +
|
|
'@import;@import\n;url(\'howdy!\')\n@import foo5 ;' +
|
|
'@import \'foo6\' \n@import "foo7";')
|
|
doc4 = f('@import foo handheld;\n@import \'bar\' handheld\n' +
|
|
'@import url(\'foo2\') handheld; @import url(bar2) ha\n' +
|
|
'@import url("foo3") handheld\n')
|
|
doc5 = f('<html><img src="a.gif" alt="b" style="url(\'foo\')">' +
|
|
'<a href = b.html name="c" style="@import \'bar.css\'">')
|
|
doc6 = doc2.replace(f('"'), f("'")) # Test single quotes, too.
|
|
|
|
# Test CSS.
|
|
s = doc1
|
|
L = urlextract(s, mimetype='text/css')
|
|
L2 = [x.url for x in L]
|
|
assert L2 == f([' blah3', 'blah4', 'blah5', ' blah8 '])
|
|
assert [s[x.start:x.end] == x.url for x in L].count(False) == 0
|
|
|
|
# Test CSS more.
|
|
s = doc3
|
|
L = urlextract(s, mimetype='text/css')
|
|
L2 = [x.url for x in L]
|
|
assert L2 == f(['foo', 'bar', 'foo2', 'http://bar2', 'foo!',
|
|
'foo3', 'bar3', 'howdy!', 'foo5', 'foo6', 'foo7'])
|
|
assert [s[x.start:x.end] == x.url for x in L].count(False) == 0
|
|
|
|
# Test CSS even more.
|
|
s = doc4
|
|
L = urlextract(s, mimetype='text/css')
|
|
L2 = [x.url for x in L]
|
|
assert L2 == f(['foo', 'bar', 'foo2', 'bar2', 'foo3'])
|
|
assert [s[x.start:x.end] == x.url for x in L].count(False) == 0
|
|
|
|
# Test HTML.
|
|
s = doc2
|
|
L = urlextract(s)
|
|
L2 = [x.url for x in L]
|
|
L3 = [x.url for x in urlextract(doc6)]
|
|
ans = f(['a.gif', 'b.html', './c.png',
|
|
'http://www.abc.edu/d.tga', 'h.gif',
|
|
'http://www.testdomain.com/', 'a.gif', '/i.png'])
|
|
assert L2 == L3 == ans
|
|
|
|
for i in range(len(L)):
|
|
assert s[L[i].start:L[i].end] == L[i].url
|
|
|
|
# Test HTML more.
|
|
n = 100
|
|
s2 = s * n
|
|
|
|
L3 = urlextract(s2)
|
|
L4 = [x.url for x in L3]
|
|
assert L4 == L2 * n
|
|
for i in range(len(L3)):
|
|
assert s2[L3[i].start:L3[i].end] == L3[i].url
|
|
|
|
# Test HTML w/ siteurl.
|
|
base = f('http://www.python.org/~guido/')
|
|
L = urlextract(s, base)
|
|
L2 = [x.url for x in L]
|
|
assert L2 == [urlparse.urljoin(base, x) for x in ans]
|
|
|
|
# Test urljoin().
|
|
assert urljoin(doc1, urlextract(doc1, mimetype='text/css')) == doc1
|
|
assert urljoin(doc2, urlextract(doc2)) == doc2
|
|
|
|
s = doc2
|
|
L = urlextract(s)
|
|
L[3].url = f('FOO')
|
|
L[5].url = f('BAR')
|
|
L[7].url = f('F00!')
|
|
assert urljoin(s, L) == f(
|
|
'<html><img src="a.gif" alt="b"><a href = b.html name="c">' +
|
|
'<td background = ./c.png width=100%><a value=/f.jpg>' +
|
|
'<img src="FOO">http://www.ignore.us/\nhttp://www.nowhere.com ' +
|
|
'<style>url(h.gif) url(BAR) http://ignore.com/a</style>' +
|
|
'<img alt="c" src = "a.gif"><img src=F00!>')
|
|
|
|
# Test HTML yet more.
|
|
s = doc5
|
|
L = urlextract(s)
|
|
L2 = [x.url for x in L]
|
|
assert L2 == f(['foo', 'a.gif', 'bar.css', 'b.html'])
|
|
assert [s[x.start:x.end] == x.url for x in L].count(False) == 0
|
|
|
|
def _python_has_unicode():
|
|
"""
|
|
True iff Python was compiled with unicode().
|
|
"""
|
|
try:
|
|
unicode
|
|
return True
|
|
except:
|
|
return False
|
|
|
|
|
|
# -------------------------------------------------------------------
|
|
# Unit Test Main Routine
|
|
# -------------------------------------------------------------------
|
|
|
|
def _test():
|
|
"""
|
|
Unit test main routine.
|
|
"""
|
|
print 'Unit tests:'
|
|
_test_remove_comments()
|
|
print ' _remove_comments: OK'
|
|
_test_shlex_split()
|
|
print ' _shlex_split: OK'
|
|
_test_tag_dict()
|
|
print ' _tag_dict: OK'
|
|
_test_tuple_replace()
|
|
print ' _tuple_replace: OK'
|
|
|
|
_test_tagextract()
|
|
print ' tagextract*: OK'
|
|
|
|
if _python_has_unicode():
|
|
_test_tagextract(unicode)
|
|
print ' tagextract (unicode)*: OK'
|
|
|
|
_test_urlextract()
|
|
print ' urlextract*: OK'
|
|
|
|
if _python_has_unicode():
|
|
_test_urlextract(unicode)
|
|
print ' urlextract (unicode)*: OK'
|
|
|
|
print
|
|
print '* The corresponding join method has been tested as well.'
|
|
|
|
|
|
if __name__ == '__main__':
|
|
_test()
|