cmlenz@1: # -*- coding: utf-8 -*-
cmlenz@1: #
cmlenz@408: # Copyright (C) 2006-2007 Edgewall Software
cmlenz@1: # All rights reserved.
cmlenz@1: #
cmlenz@1: # This software is licensed as described in the file COPYING, which
cmlenz@1: # you should have received as part of this distribution. The terms
cmlenz@230: # are also available at http://genshi.edgewall.org/wiki/License.
cmlenz@1: #
cmlenz@1: # This software consists of voluntary contributions made by many
cmlenz@1: # individuals. For the exact contribution history, see the revision
cmlenz@230: # history and logs, available at http://genshi.edgewall.org/log/.
cmlenz@1: 
cmlenz@1: """Core classes for markup processing."""
cmlenz@1: 
cmlenz@204: import operator
cmlenz@397: 
cmlenz@397: from genshi.util import plaintext, stripentities, striptags
cmlenz@1: 
cmlenz@377: __all__ = ['Stream', 'Markup', 'escape', 'unescape', 'Attrs', 'Namespace',
cmlenz@377:            'QName']
cmlenz@425: __docformat__ = 'restructuredtext en'
cmlenz@1: 
cmlenz@1: 
cmlenz@17: class StreamEventKind(str):
cmlenz@397:     """A kind of event on a markup stream."""
cmlenz@279:     __slots__ = []
cmlenz@279:     _instances = {}
cmlenz@279: 
cmlenz@279:     def __new__(cls, val):
cmlenz@279:         return cls._instances.setdefault(val, str.__new__(cls, val))
cmlenz@1: 
cmlenz@1: 
cmlenz@1: class Stream(object):
cmlenz@1:     """Represents a stream of markup events.
cmlenz@1:     
cmlenz@1:     This class is basically an iterator over the events.
cmlenz@1:     
cmlenz@425:     Stream events are tuples of the form::
cmlenz@397:     
cmlenz@397:       (kind, data, position)
cmlenz@397:     
cmlenz@425:     where ``kind`` is the event kind (such as `START`, `END`, `TEXT`, etc),
cmlenz@425:     ``data`` depends on the kind of event, and ``position`` is a
cmlenz@425:     ``(filename, line, offset)`` tuple that contains the location of the
cmlenz@425:     original element or text in the input. If the original location is unknown,
cmlenz@425:     ``position`` is ``(None, -1, -1)``.
cmlenz@397:     
cmlenz@1:     Also provided are ways to serialize the stream to text. The `serialize()`
cmlenz@1:     method will return an iterator over generated strings, while `render()`
cmlenz@1:     returns the complete generated text at once. Both accept various parameters
cmlenz@1:     that impact the way the stream is serialized.
cmlenz@1:     """
cmlenz@1:     __slots__ = ['events']
cmlenz@1: 
cmlenz@427:     START = StreamEventKind('START') #: a start tag
cmlenz@427:     END = StreamEventKind('END') #: an end tag
cmlenz@427:     TEXT = StreamEventKind('TEXT') #: literal text
cmlenz@460:     XML_DECL = StreamEventKind('XML_DECL') #: XML declaration
cmlenz@427:     DOCTYPE = StreamEventKind('DOCTYPE') #: doctype declaration
cmlenz@427:     START_NS = StreamEventKind('START_NS') #: start namespace mapping
cmlenz@427:     END_NS = StreamEventKind('END_NS') #: end namespace mapping
cmlenz@427:     START_CDATA = StreamEventKind('START_CDATA') #: start CDATA section
cmlenz@427:     END_CDATA = StreamEventKind('END_CDATA') #: end CDATA section
cmlenz@427:     PI = StreamEventKind('PI') #: processing instruction
cmlenz@427:     COMMENT = StreamEventKind('COMMENT') #: comment
cmlenz@1: 
cmlenz@1:     def __init__(self, events):
cmlenz@1:         """Initialize the stream with a sequence of markup events.
cmlenz@1:         
cmlenz@425:         :param events: a sequence or iterable providing the events
cmlenz@1:         """
cmlenz@1:         self.events = events
cmlenz@1: 
cmlenz@1:     def __iter__(self):
cmlenz@1:         return iter(self.events)
cmlenz@1: 
cmlenz@204:     def __or__(self, function):
cmlenz@204:         """Override the "bitwise or" operator to apply filters or serializers
cmlenz@204:         to the stream, providing a syntax similar to pipes on Unix shells.
cmlenz@204:         
cmlenz@204:         Assume the following stream produced by the `HTML` function:
cmlenz@204:         
cmlenz@230:         >>> from genshi.input import HTML
cmlenz@204:         >>> html = HTML('''<p onclick="alert('Whoa')">Hello, world!</p>''')
cmlenz@204:         >>> print html
cmlenz@204:         <p onclick="alert('Whoa')">Hello, world!</p>
cmlenz@204:         
cmlenz@204:         A filter such as the HTML sanitizer can be applied to that stream using
cmlenz@204:         the pipe notation as follows:
cmlenz@204:         
cmlenz@230:         >>> from genshi.filters import HTMLSanitizer
cmlenz@204:         >>> sanitizer = HTMLSanitizer()
cmlenz@204:         >>> print html | sanitizer
cmlenz@204:         <p>Hello, world!</p>
cmlenz@204:         
cmlenz@204:         Filters can be any function that accepts and produces a stream (where
cmlenz@397:         a stream is anything that iterates over events):
cmlenz@204:         
cmlenz@204:         >>> def uppercase(stream):
cmlenz@204:         ...     for kind, data, pos in stream:
cmlenz@204:         ...         if kind is TEXT:
cmlenz@204:         ...             data = data.upper()
cmlenz@204:         ...         yield kind, data, pos
cmlenz@204:         >>> print html | sanitizer | uppercase
cmlenz@204:         <p>HELLO, WORLD!</p>
cmlenz@204:         
cmlenz@204:         Serializers can also be used with this notation:
cmlenz@204:         
cmlenz@230:         >>> from genshi.output import TextSerializer
cmlenz@204:         >>> output = TextSerializer()
cmlenz@204:         >>> print html | sanitizer | uppercase | output
cmlenz@204:         HELLO, WORLD!
cmlenz@204:         
cmlenz@204:         Commonly, serializers should be used at the end of the "pipeline";
cmlenz@204:         using them somewhere in the middle may produce unexpected results.
cmlenz@204:         """
cmlenz@204:         return Stream(_ensure(function(self)))
cmlenz@204: 
cmlenz@123:     def filter(self, *filters):
cmlenz@123:         """Apply filters to the stream.
cmlenz@113:         
cmlenz@123:         This method returns a new stream with the given filters applied. The
cmlenz@123:         filters must be callables that accept the stream object as parameter,
cmlenz@123:         and return the filtered stream.
cmlenz@204:         
cmlenz@425:         The call::
cmlenz@204:         
cmlenz@204:             stream.filter(filter1, filter2)
cmlenz@204:         
cmlenz@425:         is equivalent to::
cmlenz@204:         
cmlenz@204:             stream | filter1 | filter2
cmlenz@113:         """
cmlenz@204:         return reduce(operator.or_, (self,) + filters)
cmlenz@113: 
cmlenz@123:     def render(self, method='xml', encoding='utf-8', **kwargs):
cmlenz@1:         """Return a string representation of the stream.
cmlenz@1:         
cmlenz@425:         :param method: determines how the stream is serialized; can be either
cmlenz@200:                        "xml", "xhtml", "html", "text", or a custom serializer
cmlenz@200:                        class
cmlenz@425:         :param encoding: how the output string should be encoded; if set to
cmlenz@1:                          `None`, this method returns a `unicode` object
cmlenz@1: 
cmlenz@1:         Any additional keyword arguments are passed to the serializer, and thus
cmlenz@1:         depend on the `method` parameter value.
cmlenz@438:         
cmlenz@438:         :see: XMLSerializer.__init__, XHTMLSerializer.__init__,
cmlenz@438:               HTMLSerializer.__init__, TextSerializer.__init__
cmlenz@1:         """
cmlenz@462:         from genshi.output import encode
cmlenz@123:         generator = self.serialize(method=method, **kwargs)
cmlenz@462:         return encode(generator, method=method, encoding=encoding)
cmlenz@1: 
cmlenz@278:     def select(self, path, namespaces=None, variables=None):
cmlenz@1:         """Return a new stream that contains the events matching the given
cmlenz@1:         XPath expression.
cmlenz@1:         
cmlenz@425:         :param path: a string containing the XPath expression
cmlenz@435:         :param namespaces: mapping of namespace prefixes used in the path
cmlenz@435:         :param variables: mapping of variable names to values
cmlenz@435:         :return: the selected substream
cmlenz@435:         :raises PathSyntaxError: if the given path expression is invalid or not
cmlenz@435:                                  supported
cmlenz@1:         """
cmlenz@230:         from genshi.path import Path
cmlenz@278:         return Path(path).select(self, namespaces, variables)
cmlenz@1: 
cmlenz@123:     def serialize(self, method='xml', **kwargs):
cmlenz@1:         """Generate strings corresponding to a specific serialization of the
cmlenz@1:         stream.
cmlenz@1:         
cmlenz@18:         Unlike the `render()` method, this method is a generator that returns
cmlenz@1:         the serialized output incrementally, as opposed to returning a single
cmlenz@1:         string.
cmlenz@1:         
cmlenz@425:         :param method: determines how the stream is serialized; can be either
cmlenz@200:                        "xml", "xhtml", "html", "text", or a custom serializer
cmlenz@200:                        class
cmlenz@438:         
cmlenz@147:         Any additional keyword arguments are passed to the serializer, and thus
cmlenz@147:         depend on the `method` parameter value.
cmlenz@438:         
cmlenz@438:         :see: XMLSerializer.__init__, XHTMLSerializer.__init__,
cmlenz@438:               HTMLSerializer.__init__, TextSerializer.__init__
cmlenz@1:         """
cmlenz@462:         from genshi.output import get_serializer
cmlenz@462:         return get_serializer(method, **kwargs)(_ensure(self))
cmlenz@1: 
cmlenz@1:     def __str__(self):
cmlenz@1:         return self.render()
cmlenz@1: 
cmlenz@1:     def __unicode__(self):
cmlenz@1:         return self.render(encoding=None)
cmlenz@1: 
cmlenz@1: 
cmlenz@69: START = Stream.START
cmlenz@69: END = Stream.END
cmlenz@69: TEXT = Stream.TEXT
cmlenz@460: XML_DECL = Stream.XML_DECL
cmlenz@69: DOCTYPE = Stream.DOCTYPE
cmlenz@69: START_NS = Stream.START_NS
cmlenz@69: END_NS = Stream.END_NS
cmlenz@143: START_CDATA = Stream.START_CDATA
cmlenz@143: END_CDATA = Stream.END_CDATA
cmlenz@69: PI = Stream.PI
cmlenz@69: COMMENT = Stream.COMMENT
cmlenz@69: 
cmlenz@111: def _ensure(stream):
cmlenz@111:     """Ensure that every item on the stream is actually a markup event."""
cmlenz@111:     for event in stream:
cmlenz@145:         if type(event) is not tuple:
cmlenz@145:             if hasattr(event, 'totuple'):
cmlenz@145:                 event = event.totuple()
cmlenz@145:             else:
cmlenz@145:                 event = TEXT, unicode(event), (None, -1, -1)
cmlenz@145:         yield event
cmlenz@111: 
cmlenz@69: 
cmlenz@345: class Attrs(tuple):
cmlenz@345:     """Immutable sequence type that stores the attributes of an element.
cmlenz@18:     
cmlenz@434:     Ordering of the attributes is preserved, while access by name is also
cmlenz@345:     supported.
cmlenz@18:     
cmlenz@182:     >>> attrs = Attrs([('href', '#'), ('title', 'Foo')])
cmlenz@18:     >>> attrs
cmlenz@403:     Attrs([('href', '#'), ('title', 'Foo')])
cmlenz@18:     
cmlenz@18:     >>> 'href' in attrs
cmlenz@18:     True
cmlenz@18:     >>> 'tabindex' in attrs
cmlenz@18:     False
cmlenz@403:     >>> attrs.get('title')
cmlenz@18:     'Foo'
cmlenz@345:     
cmlenz@425:     Instances may not be manipulated directly. Instead, the operators ``|`` and
cmlenz@425:     ``-`` can be used to produce new instances that have specific attributes
cmlenz@345:     added, replaced or removed.
cmlenz@345:     
cmlenz@425:     To remove an attribute, use the ``-`` operator. The right hand side can be
cmlenz@345:     either a string or a set/sequence of strings, identifying the name(s) of
cmlenz@345:     the attribute(s) to remove:
cmlenz@345:     
cmlenz@345:     >>> attrs - 'title'
cmlenz@403:     Attrs([('href', '#')])
cmlenz@345:     >>> attrs - ('title', 'href')
cmlenz@345:     Attrs()
cmlenz@345:     
cmlenz@345:     The original instance is not modified, but the operator can of course be
cmlenz@345:     used with an assignment:
cmlenz@345: 
cmlenz@18:     >>> attrs
cmlenz@403:     Attrs([('href', '#'), ('title', 'Foo')])
cmlenz@345:     >>> attrs -= 'title'
cmlenz@18:     >>> attrs
cmlenz@403:     Attrs([('href', '#')])
cmlenz@18:     
cmlenz@425:     To add a new attribute, use the ``|`` operator, where the right hand value
cmlenz@425:     is a sequence of ``(name, value)`` tuples (which includes `Attrs`
cmlenz@425:     instances):
cmlenz@170:     
cmlenz@403:     >>> attrs | [('title', 'Bar')]
cmlenz@403:     Attrs([('href', '#'), ('title', 'Bar')])
cmlenz@171:     
cmlenz@345:     If the attributes already contain an attribute with a given name, the value
cmlenz@345:     of that attribute is replaced:
cmlenz@171:     
cmlenz@403:     >>> attrs | [('href', 'http://example.org/')]
cmlenz@403:     Attrs([('href', 'http://example.org/')])
cmlenz@18:     """
cmlenz@18:     __slots__ = []
cmlenz@1: 
cmlenz@1:     def __contains__(self, name):
cmlenz@18:         """Return whether the list includes an attribute with the specified
cmlenz@18:         name.
cmlenz@18:         """
cmlenz@133:         for attr, _ in self:
cmlenz@133:             if attr == name:
cmlenz@133:                 return True
cmlenz@1: 
cmlenz@345:     def __getslice__(self, i, j):
cmlenz@345:         return Attrs(tuple.__getslice__(self, i, j))
cmlenz@345: 
cmlenz@345:     def __or__(self, attrs):
cmlenz@345:         """Return a new instance that contains the attributes in `attrs` in
cmlenz@345:         addition to any already existing attributes.
cmlenz@345:         """
cmlenz@345:         repl = dict([(an, av) for an, av in attrs if an in self])
cmlenz@345:         return Attrs([(sn, repl.get(sn, sv)) for sn, sv in self] +
cmlenz@345:                      [(an, av) for an, av in attrs if an not in self])
cmlenz@345: 
cmlenz@326:     def __repr__(self):
cmlenz@326:         if not self:
cmlenz@326:             return 'Attrs()'
cmlenz@345:         return 'Attrs([%s])' % ', '.join([repr(item) for item in self])
cmlenz@345: 
cmlenz@345:     def __sub__(self, names):
cmlenz@345:         """Return a new instance with all attributes with a name in `names` are
cmlenz@345:         removed.
cmlenz@345:         """
cmlenz@345:         if isinstance(names, basestring):
cmlenz@345:             names = (names,)
cmlenz@345:         return Attrs([(name, val) for name, val in self if name not in names])
cmlenz@326: 
cmlenz@1:     def get(self, name, default=None):
cmlenz@18:         """Return the value of the attribute with the specified name, or the
cmlenz@18:         value of the `default` parameter if no such attribute is found.
cmlenz@435:         
cmlenz@435:         :param name: the name of the attribute
cmlenz@435:         :param default: the value to return when the attribute does not exist
cmlenz@435:         :return: the attribute value, or the `default` value if that attribute
cmlenz@435:                  does not exist
cmlenz@18:         """
cmlenz@1:         for attr, value in self:
cmlenz@1:             if attr == name:
cmlenz@1:                 return value
cmlenz@1:         return default
cmlenz@1: 
cmlenz@77:     def totuple(self):
cmlenz@161:         """Return the attributes as a markup event.
cmlenz@161:         
cmlenz@425:         The returned event is a `TEXT` event, the data is the value of all
cmlenz@161:         attributes joined together.
cmlenz@434:         
cmlenz@434:         >>> Attrs([('href', '#'), ('title', 'Foo')]).totuple()
cmlenz@434:         ('TEXT', u'#Foo', (None, -1, -1))
cmlenz@161:         """
cmlenz@77:         return TEXT, u''.join([x[1] for x in self]), (None, -1, -1)
cmlenz@77: 
cmlenz@1: 
cmlenz@1: class Markup(unicode):
cmlenz@1:     """Marks a string as being safe for inclusion in HTML/XML output without
cmlenz@1:     needing to be escaped.
cmlenz@1:     """
cmlenz@18:     __slots__ = []
cmlenz@18: 
cmlenz@27:     def __new__(cls, text='', *args):
cmlenz@1:         if args:
cmlenz@136:             text %= tuple(map(escape, args))
cmlenz@27:         return unicode.__new__(cls, text)
cmlenz@1: 
cmlenz@1:     def __add__(self, other):
cmlenz@204:         return Markup(unicode(self) + unicode(escape(other)))
cmlenz@204: 
cmlenz@204:     def __radd__(self, other):
cmlenz@204:         return Markup(unicode(escape(other)) + unicode(self))
cmlenz@1: 
cmlenz@1:     def __mod__(self, args):
cmlenz@1:         if not isinstance(args, (list, tuple)):
cmlenz@1:             args = [args]
cmlenz@136:         return Markup(unicode.__mod__(self, tuple(map(escape, args))))
cmlenz@1: 
cmlenz@1:     def __mul__(self, num):
cmlenz@1:         return Markup(unicode(self) * num)
cmlenz@1: 
cmlenz@204:     def __rmul__(self, num):
cmlenz@204:         return Markup(num * unicode(self))
cmlenz@204: 
cmlenz@17:     def __repr__(self):
cmlenz@382:         return '<%s %r>' % (self.__class__.__name__, unicode(self))
cmlenz@17: 
cmlenz@54:     def join(self, seq, escape_quotes=True):
cmlenz@434:         """Return a `Markup` object which is the concatenation of the strings
cmlenz@434:         in the given sequence, where this `Markup` object is the separator
cmlenz@434:         between the joined elements.
cmlenz@434:         
cmlenz@434:         Any element in the sequence that is not a `Markup` instance is
cmlenz@434:         automatically escaped.
cmlenz@434:         
cmlenz@434:         :param seq: the sequence of strings to join
cmlenz@434:         :param escape_quotes: whether double quote characters in the elements
cmlenz@434:                               should be escaped
cmlenz@434:         :return: the joined `Markup` object
cmlenz@434:         :see: `escape`
cmlenz@434:         """
cmlenz@54:         return Markup(unicode(self).join([escape(item, quotes=escape_quotes)
mgood@34:                                           for item in seq]))
cmlenz@1: 
cmlenz@1:     def escape(cls, text, quotes=True):
cmlenz@1:         """Create a Markup instance from a string and escape special characters
cmlenz@1:         it may contain (<, >, & and \").
cmlenz@1:         
cmlenz@434:         >>> escape('"1 < 2"')
cmlenz@434:         <Markup u'&#34;1 &lt; 2&#34;'>
cmlenz@434:         
cmlenz@1:         If the `quotes` parameter is set to `False`, the \" character is left
cmlenz@1:         as is. Escaping quotes is generally only required for strings that are
cmlenz@1:         to be used in attribute values.
cmlenz@434:         
cmlenz@434:         >>> escape('"1 < 2"', quotes=False)
cmlenz@434:         <Markup u'"1 &lt; 2"'>
cmlenz@434:         
cmlenz@434:         :param text: the text to escape
cmlenz@434:         :param quotes: if ``True``, double quote characters are escaped in
cmlenz@434:                        addition to the other special characters
cmlenz@434:         :return: the escaped `Markup` string
cmlenz@434:         :see: `genshi.core.escape`
cmlenz@1:         """
cmlenz@73:         if not text:
cmlenz@73:             return cls()
cmlenz@73:         if type(text) is cls:
cmlenz@1:             return text
cmlenz@73:         text = unicode(text).replace('&', '&amp;') \
cmlenz@73:                             .replace('<', '&lt;') \
cmlenz@73:                             .replace('>', '&gt;')
cmlenz@1:         if quotes:
cmlenz@1:             text = text.replace('"', '&#34;')
cmlenz@1:         return cls(text)
cmlenz@1:     escape = classmethod(escape)
cmlenz@1: 
cmlenz@1:     def unescape(self):
cmlenz@434:         """Reverse-escapes &, <, >, and \" and returns a `unicode` object.
cmlenz@434:         
cmlenz@434:         >>> Markup('1 &lt; 2').unescape()
cmlenz@434:         u'1 < 2'
cmlenz@434:         
cmlenz@434:         :see: `genshi.core.unescape`
cmlenz@434:         """
cmlenz@1:         if not self:
cmlenz@18:             return u''
cmlenz@1:         return unicode(self).replace('&#34;', '"') \
cmlenz@1:                             .replace('&gt;', '>') \
cmlenz@1:                             .replace('&lt;', '<') \
cmlenz@1:                             .replace('&amp;', '&')
cmlenz@1: 
cmlenz@116:     def stripentities(self, keepxmlentities=False):
cmlenz@116:         """Return a copy of the text with any character or numeric entities
cmlenz@116:         replaced by the equivalent UTF-8 characters.
cmlenz@116:         
cmlenz@116:         If the `keepxmlentities` parameter is provided and evaluates to `True`,
cmlenz@434:         the core XML entities (``&amp;``, ``&apos;``, ``&gt;``, ``&lt;`` and
cmlenz@434:         ``&quot;``) are not stripped.
cmlenz@434:         
cmlenz@434:         :see: `genshi.util.stripentities`
cmlenz@6:         """
cmlenz@116:         return Markup(stripentities(self, keepxmlentities=keepxmlentities))
cmlenz@116: 
cmlenz@116:     def striptags(self):
cmlenz@434:         """Return a copy of the text with all XML/HTML tags removed.
cmlenz@434:         
cmlenz@434:         :see: `genshi.util.striptags`
cmlenz@434:         """
cmlenz@116:         return Markup(striptags(self))
cmlenz@1: 
cmlenz@1: 
cmlenz@1: escape = Markup.escape
cmlenz@1: 
cmlenz@1: def unescape(text):
cmlenz@434:     """Reverse-escapes &, <, >, and \" and returns a `unicode` object.
cmlenz@434:     
cmlenz@434:     >>> unescape(Markup('1 &lt; 2'))
cmlenz@434:     u'1 < 2'
cmlenz@434:     
cmlenz@434:     If the provided `text` object is not a `Markup` instance, the text is
cmlenz@434:     returned as-is.
cmlenz@434:     
cmlenz@434:     >>> unescape('1 &lt; 2')
cmlenz@434:     '1 &lt; 2'
cmlenz@434:     
cmlenz@434:     :param text: the text to unescape
cmlenz@434:     """
cmlenz@1:     if not isinstance(text, Markup):
cmlenz@1:         return text
cmlenz@1:     return text.unescape()
cmlenz@1: 
cmlenz@1: 
cmlenz@1: class Namespace(object):
cmlenz@18:     """Utility class creating and testing elements with a namespace.
cmlenz@18:     
cmlenz@18:     Internally, namespace URIs are encoded in the `QName` of any element or
cmlenz@18:     attribute, the namespace URI being enclosed in curly braces. This class
cmlenz@18:     helps create and test these strings.
cmlenz@18:     
cmlenz@18:     A `Namespace` object is instantiated with the namespace URI.
cmlenz@18:     
cmlenz@18:     >>> html = Namespace('http://www.w3.org/1999/xhtml')
cmlenz@18:     >>> html
cmlenz@18:     <Namespace "http://www.w3.org/1999/xhtml">
cmlenz@18:     >>> html.uri
cmlenz@18:     u'http://www.w3.org/1999/xhtml'
cmlenz@18:     
cmlenz@18:     The `Namespace` object can than be used to generate `QName` objects with
cmlenz@18:     that namespace:
cmlenz@18:     
cmlenz@18:     >>> html.body
cmlenz@326:     QName(u'http://www.w3.org/1999/xhtml}body')
cmlenz@18:     >>> html.body.localname
cmlenz@18:     u'body'
cmlenz@18:     >>> html.body.namespace
cmlenz@18:     u'http://www.w3.org/1999/xhtml'
cmlenz@18:     
cmlenz@18:     The same works using item access notation, which is useful for element or
cmlenz@18:     attribute names that are not valid Python identifiers:
cmlenz@18:     
cmlenz@18:     >>> html['body']
cmlenz@326:     QName(u'http://www.w3.org/1999/xhtml}body')
cmlenz@18:     
cmlenz@18:     A `Namespace` object can also be used to test whether a specific `QName`
cmlenz@425:     belongs to that namespace using the ``in`` operator:
cmlenz@18:     
cmlenz@18:     >>> qname = html.body
cmlenz@18:     >>> qname in html
cmlenz@18:     True
cmlenz@18:     >>> qname in Namespace('http://www.w3.org/2002/06/xhtml2')
cmlenz@18:     False
cmlenz@18:     """
cmlenz@224:     def __new__(cls, uri):
cmlenz@224:         if type(uri) is cls:
cmlenz@224:             return uri
cmlenz@224:         return object.__new__(cls, uri)
cmlenz@224: 
cmlenz@279:     def __getnewargs__(self):
cmlenz@279:         return (self.uri,)
cmlenz@279: 
cmlenz@279:     def __getstate__(self):
cmlenz@279:         return self.uri
cmlenz@279: 
cmlenz@279:     def __setstate__(self, uri):
cmlenz@279:         self.uri = uri
cmlenz@279: 
cmlenz@18:     def __init__(self, uri):
cmlenz@18:         self.uri = unicode(uri)
cmlenz@1: 
cmlenz@18:     def __contains__(self, qname):
cmlenz@18:         return qname.namespace == self.uri
cmlenz@18: 
cmlenz@278:     def __ne__(self, other):
cmlenz@278:         return not self == other
cmlenz@278: 
cmlenz@18:     def __eq__(self, other):
cmlenz@18:         if isinstance(other, Namespace):
cmlenz@18:             return self.uri == other.uri
cmlenz@18:         return self.uri == other
cmlenz@1: 
cmlenz@1:     def __getitem__(self, name):
cmlenz@18:         return QName(self.uri + u'}' + name)
cmlenz@1:     __getattr__ = __getitem__
cmlenz@1: 
cmlenz@1:     def __repr__(self):
cmlenz@1:         return '<Namespace "%s">' % self.uri
cmlenz@1: 
cmlenz@1:     def __str__(self):
cmlenz@18:         return self.uri.encode('utf-8')
cmlenz@1: 
cmlenz@1:     def __unicode__(self):
cmlenz@18:         return self.uri
cmlenz@1: 
cmlenz@1: 
cmlenz@147: # The namespace used by attributes such as xml:lang and xml:space
cmlenz@141: XML_NAMESPACE = Namespace('http://www.w3.org/XML/1998/namespace')
cmlenz@141: 
cmlenz@141: 
cmlenz@1: class QName(unicode):
cmlenz@1:     """A qualified element or attribute name.
cmlenz@1:     
cmlenz@1:     The unicode value of instances of this class contains the qualified name of
cmlenz@425:     the element or attribute, in the form ``{namespace}localname``. The namespace
cmlenz@1:     URI can be obtained through the additional `namespace` attribute, while the
cmlenz@1:     local name can be accessed through the `localname` attribute.
cmlenz@18:     
cmlenz@18:     >>> qname = QName('foo')
cmlenz@18:     >>> qname
cmlenz@326:     QName(u'foo')
cmlenz@18:     >>> qname.localname
cmlenz@18:     u'foo'
cmlenz@18:     >>> qname.namespace
cmlenz@18:     
cmlenz@18:     >>> qname = QName('http://www.w3.org/1999/xhtml}body')
cmlenz@18:     >>> qname
cmlenz@326:     QName(u'http://www.w3.org/1999/xhtml}body')
cmlenz@18:     >>> qname.localname
cmlenz@18:     u'body'
cmlenz@18:     >>> qname.namespace
cmlenz@18:     u'http://www.w3.org/1999/xhtml'
cmlenz@1:     """
cmlenz@1:     __slots__ = ['namespace', 'localname']
cmlenz@1: 
cmlenz@1:     def __new__(cls, qname):
cmlenz@100:         if type(qname) is cls:
cmlenz@1:             return qname
cmlenz@1: 
cmlenz@18:         parts = qname.split(u'}', 1)
cmlenz@100:         if len(parts) > 1:
cmlenz@136:             self = unicode.__new__(cls, u'{%s' % qname)
cmlenz@136:             self.namespace, self.localname = map(unicode, parts)
cmlenz@1:         else:
cmlenz@1:             self = unicode.__new__(cls, qname)
cmlenz@136:             self.namespace, self.localname = None, unicode(qname)
cmlenz@1:         return self
cmlenz@279: 
cmlenz@279:     def __getnewargs__(self):
cmlenz@279:         return (self.lstrip('{'),)
cmlenz@326: 
cmlenz@326:     def __repr__(self):
cmlenz@326:         return 'QName(%s)' % unicode.__repr__(self.lstrip('{'))