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o

!�b5.�@s�dZddlZddlmZddlmZmZmZmZm	Z	m
Z
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�ZGdd�de�ZGd
d�de�Ze�ZdS)aSupport for programmatically generating markup streams from Python code using
a very simple syntax. The main entry point to this module is the `tag` object
(which is actually an instance of the ``ElementFactory`` class). You should
rarely (if ever) need to directly import and use any of the other classes in
this module.

Elements can be created using the `tag` object using attribute access. For
example:

>>> doc = tag.p('Some text and ', tag.a('a link', href='http://example.org/'), '.')
>>> doc
<Element "p">

This produces an `Element` instance which can be further modified to add child
nodes and attributes. This is done by "calling" the element: positional
arguments are added as child nodes (alternatively, the `Element.append` method
can be used for that purpose), whereas keywords arguments are added as
attributes:

>>> doc(tag.br)
<Element "p">
>>> print(doc)
<p>Some text and <a href="http://example.org/">a link</a>.<br/></p>

If an attribute name collides with a Python keyword, simply append an underscore
to the name:

>>> doc(class_='intro')
<Element "p">
>>> print(doc)
<p class="intro">Some text and <a href="http://example.org/">a link</a>.<br/></p>

As shown above, an `Element` can easily be directly rendered to XML text by
printing it or using the Python ``str()`` function. This is basically a
shortcut for converting the `Element` to a stream and serializing that
stream:

>>> stream = doc.generate()
>>> stream #doctest: +ELLIPSIS
<genshi.core.Stream object at ...>
>>> print(stream)
<p class="intro">Some text and <a href="http://example.org/">a link</a>.<br/></p>


The `tag` object also allows creating "fragments", which are basically lists
of nodes (elements or text) that don't have a parent element. This can be useful
for creating snippets of markup that are attached to a parent element later (for
example in a template). Fragments are created by calling the `tag` object, which
returns an object of type `Fragment`:

>>> fragment = tag('Hello, ', tag.em('world'), '!')
>>> fragment
<Fragment>
>>> print(fragment)
Hello, <em>world</em>!
�N)�
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�rIc@s@eZdZdZddgZdd�Zdd�Zdd	�Zd
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    Construct XML elements by passing the tag name to the constructor:

    >>> print(Element('strong'))
    <strong/>

    Attributes can be specified using keyword arguments. The values of the
    arguments will be converted to strings and any special XML characters
    escaped:

    >>> print(Element('textarea', rows=10))
    <textarea rows="10"/>
    >>> print(Element('span', title='1 < 2'))
    <span title="1 &lt; 2"/>
    >>> print(Element('span', title='"baz"'))
    <span title="&#34;baz&#34;"/>

    The " character is escaped using a numerical entity.
    The order in which attributes are rendered is undefined.

    If an attribute value evaluates to `None`, that attribute is not included
    in the output:

    >>> print(Element('a', name=None))
    <a/>

    Attribute names that conflict with Python keywords can be specified by
    appending an underscore:

    >>> print(Element('div', class_='warning'))
    <div class="warning"/>

    Nested elements can be added to an element using item access notation.
    The call notation can also be used for this and for adding attributes
    using keyword arguments, as one would do in the constructor.

    >>> print(Element('ul')(Element('li'), Element('li')))
    <ul><li/><li/></ul>
    >>> print(Element('a')('Label'))
    <a>Label</a>
    >>> print(Element('a')('Label', href="target"))
    <a href="target">Label</a>

    Text nodes can be nested in an element by adding strings instead of
    elements. Any special characters in the strings are escaped automatically:

    >>> print(Element('em')('Hello world'))
    <em>Hello world</em>
    >>> print(Element('em')(42))
    <em>42</em>
    >>> print(Element('em')('1 < 2'))
    <em>1 &lt; 2</em>

    This technique also allows mixed content:

    >>> print(Element('p')('Hello ', Element('b')('world')))
    <p>Hello <b>world</b></p>

    Quotes are not escaped inside text nodes:
    >>> print(Element('p')('"Hello"'))
    <p>"Hello"</p>

    Elements can also be combined with other elements or strings using the
    addition operator, which results in a `Fragment` object that contains the
    operands:
    
    >>> print(Element('br') + 'some text' + Element('br'))
    <br/>some text<br/>
    
    Elements with a namespace can be generated using the `Namespace` and/or
    `QName` classes:
    
    >>> from genshi.core import Namespace
    >>> xhtml = Namespace('http://www.w3.org/1999/xhtml')
    >>> print(Element(xhtml.html, lang='en'))
    <html xmlns="http://www.w3.org/1999/xhtml" lang="en"/>
    r�attribcKs"t�|�t|�|_t|�|_dSr)rrrrrIrJ)r�tag_rJrrrr�s

zElement.__init__cOs(|jt|�O_tj|g|�R�|S)z�Append any positional arguments as child nodes, and keyword arguments
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        )rJrIrr)rrrDrrrrszElement.__call__cCsdt|�j|jfS)Nz	<%s "%s">)r r!rrrrrr"szElement.__repr__ccsJ�t|j|jfdfVt�|�D]\}}}|||fVqt|jdfVdSr3)rrrJrrr	)r�kind�data�posrrrrs
�zElement._generatecCr$r6r7rrrrr&r8zElement.generateN)
r!r9r:r;r<rrr"rr&rrrrr�sNrc@s2eZdZdZddd�Zdd�Zdd�Zd	d
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    A new element is created simply by accessing a correspondingly named
    attribute of the factory object:
    
    >>> factory = ElementFactory()
    >>> print(factory.foo)
    <foo/>
    >>> print(factory.foo(id=2))
    <foo id="2"/>
    
    Markup fragments (lists of nodes without a parent element) can be created
    by calling the factory:
    
    >>> print(factory('Hello, ', factory.em('world'), '!'))
    Hello, <em>world</em>!
    
    A factory can also be bound to a specific namespace:
    
    >>> factory = ElementFactory('http://www.w3.org/1999/xhtml')
    >>> print(factory.html(lang="en"))
    <html xmlns="http://www.w3.org/1999/xhtml" lang="en"/>
    
    The namespace for a specific element can be altered on an existing factory
    by specifying the new namespace using item access:
    
    >>> factory = ElementFactory()
    >>> print(factory.html(factory['http://www.w3.org/2000/svg'].g(id=3)))
    <html><g xmlns="http://www.w3.org/2000/svg" id="3"/></html>
    
    Usually, the `ElementFactory` class is not be used directly. Rather, the
    `tag` instance should be used to create elements.
    NcCs |rt|t�st|�}||_dS)z�Create the factory, optionally bound to the given namespace.
        
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zElementFactory.__call__cCst|�S)aReturn a new factory that is bound to the specified namespace.
        
        :param namespace: the namespace URI or `Namespace` object
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        )r
rPrrr�__getitem__SszElementFactory.__getitem__cCst|jr	|j|p
|�S)z�Create an `Element` with the given name.
        
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