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ApiDocs/0.3.x/genshi.builder

genshi.builder

(Not documented)

Fragment

Represents a markup fragment, which is basically just a list of element or text nodes.

append(self, node)

Append an element or string as child node.

generate(self)

Return a markup event stream for the fragment.

Element

Simple XML output generator based on the builder pattern.

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, cols=60)
<textarea rows="10" cols="60"/>
>>> 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 lang="en" xmlns="http://www.w3.org/1999/xhtml"/>

generate(self)

Return a markup event stream for the fragment.

ElementFactory

Factory for Element objects.

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 lang="en" xmlns="http://www.w3.org/1999/xhtml"/>

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 id="3" xmlns="http://www.w3.org/2000/svg"/></html>

Usually, the ElementFactory class is not be used directly. Rather, the tag instance should be used to create elements.


See ApiDocs/0.3.x, Documentation