Minify on backend

libs/cssutils/css/cssrulelist.py

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+"""CSSRuleList implements DOM Level 2 CSS CSSRuleList.
+Partly also http://dev.w3.org/csswg/cssom/#the-cssrulelist."""
+__all__ = ['CSSRuleList']
+__docformat__ = 'restructuredtext'
+__version__ = '$Id$'
+
+class CSSRuleList(list):
+    """The CSSRuleList object represents an (ordered) list of statements.
+
+    The items in the CSSRuleList are accessible via an integral index,
+    starting from 0.
+
+    Subclasses a standard Python list so theoretically all standard list
+    methods are available. Setting methods like ``__init__``, ``append``,
+    ``extend`` or ``__setslice__`` are added later on instances of this
+    class if so desired.
+    E.g. CSSStyleSheet adds ``append`` which is not available in a simple
+    instance of this class! 
+    """
+    def __init__(self, *ignored):
+        "Nothing is set as this must also be defined later."
+        pass
+    
+    def __notimplemented(self, *ignored):
+        "Implemented in class using a CSSRuleList only."
+        raise NotImplementedError(
+            'Must be implemented by class using an instance of this class.')
+    
+    append = extend = __setitem__ = __setslice__ = __notimplemented
+    
+    def item(self, index):
+        """(DOM) Retrieve a CSS rule by ordinal `index`. The order in this
+        collection represents the order of the rules in the CSS style
+        sheet. If index is greater than or equal to the number of rules in
+        the list, this returns None.
+
+        Returns CSSRule, the style rule at the index position in the
+        CSSRuleList, or None if that is not a valid index.
+        """
+        try:
+            return self[index]
+        except IndexError:
+            return None
+
+    length = property(lambda self: len(self),
+                      doc=u"(DOM) The number of CSSRules in the list.")
+
+    def rulesOfType(self, type):
+        """Yield the rules which have the given `type` only, one of the 
+        constants defined in :class:`cssutils.css.CSSRule`."""
+        for r in self:
+            if r.type == type:
+                yield r