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144 lines
4.5 KiB
144 lines
4.5 KiB
# $Id: __init__.py 8239 2018-11-21 21:46:00Z milde $
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# Author: David Goodger <goodger@python.org>
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# Copyright: This module has been placed in the public domain.
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"""
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This package contains Docutils Writer modules.
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"""
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__docformat__ = 'reStructuredText'
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import os.path
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import sys
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import docutils
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from docutils import languages, Component
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from docutils.transforms import universal
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class Writer(Component):
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"""
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Abstract base class for docutils Writers.
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Each writer module or package must export a subclass also called 'Writer'.
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Each writer must support all standard node types listed in
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`docutils.nodes.node_class_names`.
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The `write()` method is the main entry point.
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"""
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component_type = 'writer'
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config_section = 'writers'
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def get_transforms(self):
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return Component.get_transforms(self) + [
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universal.Messages,
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universal.FilterMessages,
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universal.StripClassesAndElements,]
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document = None
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"""The document to write (Docutils doctree); set by `write`."""
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output = None
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"""Final translated form of `document` (Unicode string for text, binary
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string for other forms); set by `translate`."""
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language = None
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"""Language module for the document; set by `write`."""
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destination = None
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"""`docutils.io` Output object; where to write the document.
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Set by `write`."""
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def __init__(self):
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# Used by HTML and LaTeX writer for output fragments:
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self.parts = {}
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"""Mapping of document part names to fragments of `self.output`.
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Values are Unicode strings; encoding is up to the client. The 'whole'
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key should contain the entire document output.
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"""
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def write(self, document, destination):
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"""
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Process a document into its final form.
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Translate `document` (a Docutils document tree) into the Writer's
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native format, and write it out to its `destination` (a
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`docutils.io.Output` subclass object).
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Normally not overridden or extended in subclasses.
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"""
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self.document = document
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self.language = languages.get_language(
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document.settings.language_code,
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document.reporter)
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self.destination = destination
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self.translate()
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output = self.destination.write(self.output)
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return output
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def translate(self):
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"""
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Do final translation of `self.document` into `self.output`. Called
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from `write`. Override in subclasses.
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Usually done with a `docutils.nodes.NodeVisitor` subclass, in
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combination with a call to `docutils.nodes.Node.walk()` or
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`docutils.nodes.Node.walkabout()`. The ``NodeVisitor`` subclass must
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support all standard elements (listed in
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`docutils.nodes.node_class_names`) and possibly non-standard elements
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used by the current Reader as well.
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"""
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raise NotImplementedError('subclass must override this method')
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def assemble_parts(self):
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"""Assemble the `self.parts` dictionary. Extend in subclasses."""
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self.parts['whole'] = self.output
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self.parts['encoding'] = self.document.settings.output_encoding
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self.parts['version'] = docutils.__version__
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class UnfilteredWriter(Writer):
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"""
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A writer that passes the document tree on unchanged (e.g. a
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serializer.)
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Documents written by UnfilteredWriters are typically reused at a
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later date using a subclass of `readers.ReReader`.
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"""
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def get_transforms(self):
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# Do not add any transforms. When the document is reused
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# later, the then-used writer will add the appropriate
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# transforms.
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return Component.get_transforms(self)
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_writer_aliases = {
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'html': 'html4css1', # may change to html5 some day
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'html4': 'html4css1',
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'html5': 'html5_polyglot',
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'latex': 'latex2e',
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'pprint': 'pseudoxml',
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'pformat': 'pseudoxml',
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'pdf': 'rlpdf',
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's5': 's5_html',
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'xelatex': 'xetex',
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'xhtml': 'html5_polyglot',
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'xhtml10': 'html4css1',
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'xml': 'docutils_xml'}
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def get_writer_class(writer_name):
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"""Return the Writer class from the `writer_name` module."""
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writer_name = writer_name.lower()
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if writer_name in _writer_aliases:
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writer_name = _writer_aliases[writer_name]
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try:
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module = __import__(writer_name, globals(), locals(), level=1)
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except ImportError:
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module = __import__(writer_name, globals(), locals(), level=0)
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return module.Writer
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