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-.. -*- mode: rst -*-
-
-=====================
-Write your own filter
-=====================
-
-.. versionadded:: 0.7
-
-Writing own filters is very easy. All you have to do is to subclass
-the `Filter` class and override the `filter` method. Additionally a
-filter is instantiated with some keyword arguments you can use to
-adjust the behavior of your filter.
-
-
-Subclassing Filters
-===================
-
-As an example, we write a filter that converts all `Name.Function` tokens
-to normal `Name` tokens to make the output less colorful.
-
-.. sourcecode:: python
-
-    from pygments.util import get_bool_opt
-    from pygments.token import Name
-    from pygments.filter import Filter
-
-    class UncolorFilter(Filter):
-
-        def __init__(self, **options):
-            Filter.__init__(self, **options)
-            self.class_too = get_bool_opt(options, 'classtoo')
-
-        def filter(self, lexer, stream):
-            for ttype, value in stream:
-                if ttype is Name.Function or (self.class_too and
-                                              ttype is Name.Class):
-                    ttype = Name
-                yield ttype, value
-
-Some notes on the `lexer` argument: that can be quite confusing since it doesn't
-need to be a lexer instance. If a filter was added by using the `add_filter()`
-function of lexers, that lexer is registered for the filter. In that case
-`lexer` will refer to the lexer that has registered the filter. It *can* be used
-to access options passed to a lexer. Because it could be `None` you always have
-to check for that case if you access it.
-
-
-Using a decorator
-=================
-
-You can also use the `simplefilter` decorator from the `pygments.filter` module:
-
-.. sourcecode:: python
-
-    from pygments.util import get_bool_opt
-    from pygments.token import Name
-    from pygments.filter import simplefilter
-
-
-    @simplefilter
-    def uncolor(self, lexer, stream, options):
-        class_too = get_bool_opt(options, 'classtoo')
-        for ttype, value in stream:
-            if ttype is Name.Function or (class_too and
-                                          ttype is Name.Class):
-                ttype = Name
-            yield ttype, value
-
-The decorator automatically subclasses an internal filter class and uses the
-decorated function as a method for filtering.  (That's why there is a `self`
-argument that you probably won't end up using in the method.)