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libs/cssutils/stylesheets/stylesheetlist.py

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+"""StyleSheetList implements DOM Level 2 Style Sheets StyleSheetList."""
+__all__ = ['StyleSheetList']
+__docformat__ = 'restructuredtext'
+__version__ = '$Id$'
+
+class StyleSheetList(list):
+    """Interface `StyleSheetList` (introduced in DOM Level 2)
+
+    The `StyleSheetList` interface provides the abstraction of an ordered
+    collection of :class:`~cssutils.stylesheets.StyleSheet` objects.
+
+    The items in the `StyleSheetList` are accessible via an integral index,
+    starting from 0.
+
+    This Python implementation is based on a standard Python list so e.g.
+    allows ``examplelist[index]`` usage.
+    """
+    def item(self, index):
+        """
+        Used to retrieve a style sheet by ordinal `index`. If `index` is
+        greater than or equal to the number of style sheets in the list,
+        this returns ``None``.
+        """
+        try:
+            return self[index]
+        except IndexError:
+            return None
+
+    length = property(lambda self: len(self),
+        doc="The number of :class:`StyleSheet` objects in the list. The range"
+        "  of valid child stylesheet indices is 0 to length-1 inclusive.")
+