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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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            serialize the attribute children.

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    A text attribute for text with formatting attributes.

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    Generic color attribute.

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    A color text attribute.

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        up from.

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    Mixin for character attributes that implements a C{__getattr__} method
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    A character attribute that does nothing, thus applying no attributes to
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        Make a copy of this formatting state.

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        Add a character attribute to a copy of this formatting state.

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        Emit a VT102 control sequence that will set up all the attributes this
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    Mixin for the formatting state/attributes of a single character.
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    Serialize a sequence of characters with attribute information

    The resulting string can be interpreted by compatible software so that the
    contained characters are displayed and, for those attributes which are
    supported by the software, the attributes expressed. The exact result of
    the serialization depends on the behavior of the method specified by
    I{attributeRenderer}.

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

        from twisted.conch.insults.text import flatten, attributes as A
        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
        module-level attributes object.

    @param attrs: A formatting state instance used to determine how to
        serialize C{output}.

    @type attributeRenderer: C{str}
    @param attributeRenderer: Name of the method on I{attrs} that should be
        called to render the attributes during serialization. Defaults to
        C{'toVT102'}.

    @return: A string expressing the text and display attributes specified by
        L{output}.
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