# $Id: doctree.py 4564 2006-05-21 20:44:42Z wiemann $

# Author: Martin Blais <blais@furius.ca>

# Copyright: This module has been placed in the public domain.

"""Reader for existing document trees."""

from docutils import readers, utils, transforms

class Reader(readers.ReReader):

    """

    Adapt the Reader API for an existing document tree.

    The existing document tree must be passed as the ``source`` parameter to

    the `docutils.core.Publisher` initializer, wrapped in a

    `docutils.io.DocTreeInput` object::

        pub = docutils.core.Publisher(

            ..., source=docutils.io.DocTreeInput(document), ...)

    The original document settings are overridden; if you want to use the

    settings of the original document, pass ``settings=document.settings`` to

    the Publisher call above.

    """

    supported = ('doctree',)

    config_section = 'doctree reader'

    config_section_dependencies = ('readers',)

    def parse(self):

        """

        No parsing to do; refurbish the document tree instead.

        Overrides the inherited method.

        """

        self.document = self.input

        # Create fresh Transformer object, to be populated from Writer

        # component.

        self.document.transformer = transforms.Transformer(self.document)

        # Replace existing settings object with new one.

        self.document.settings = self.settings

        # Create fresh Reporter object because it is dependent on

        # (new) settings.

        self.document.reporter = utils.new_reporter(

            self.document.get('source', ''), self.document.settings)