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This module provides some common functionality for the manipulation of
formatting states.

Defining the mechanism by which text containing character attributes is
constructed begins by subclassing L{CharacterAttributesMixin}.

Defining how a single formatting state is to be serialized begins by
subclassing L{_FormattingStateMixin}.

Serializing a formatting structure is done with L{flatten}.

@see: L{twisted.conch.insults.helper._FormattingState}
@see: L{twisted.conch.insults.text._CharacterAttributes}
@see: L{twisted.words.protocols.irc._FormattingState}
@see: L{twisted.words.protocols.irc._CharacterAttributes}
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    Mixin for character attributes that implements a C{__getattr__} method
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    Serialize a sequence of characters with attribute information

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    I{attributeRenderer}.

    For example, if your terminal is VT102 compatible, you might run
    this for a colorful variation on the "hello world" theme::

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        from twisted.conch.insults.helper import CharacterAttribute
        print(flatten(
            A.normal[A.bold[A.fg.red['He'], A.fg.green['ll'], A.fg.magenta['o'], ' ',
                            A.fg.yellow['Wo'], A.fg.blue['rl'], A.fg.cyan['d!']]],
            CharacterAttribute()))

    @param output: Object returned by accessing attributes of the
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