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113 lines
3.4 KiB
113 lines
3.4 KiB
4 years ago
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# $Id: __init__.py 8239 2018-11-21 21:46:00Z milde $
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# Authors: David Goodger <goodger@python.org>; Ueli Schlaepfer
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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 Reader modules.
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"""
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__docformat__ = 'reStructuredText'
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import sys
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from docutils import utils, parsers, Component
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from docutils.transforms import universal
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class Reader(Component):
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"""
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Abstract base class for docutils Readers.
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Each reader module or package must export a subclass also called 'Reader'.
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The two steps of a Reader's responsibility are to read data from the
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source Input object and parse the data with the Parser object.
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Call `read()` to process a document.
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"""
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component_type = 'reader'
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config_section = 'readers'
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def get_transforms(self):
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return Component.get_transforms(self) + [
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universal.Decorations,
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universal.ExposeInternals,
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universal.StripComments,]
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def __init__(self, parser=None, parser_name=None):
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"""
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Initialize the Reader instance.
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Several instance attributes are defined with dummy initial values.
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Subclasses may use these attributes as they wish.
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"""
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self.parser = parser
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"""A `parsers.Parser` instance shared by all doctrees. May be left
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unspecified if the document source determines the parser."""
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if parser is None and parser_name:
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self.set_parser(parser_name)
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self.source = None
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"""`docutils.io` IO object, source of input data."""
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self.input = None
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"""Raw text input; either a single string or, for more complex cases,
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a collection of strings."""
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def set_parser(self, parser_name):
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"""Set `self.parser` by name."""
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parser_class = parsers.get_parser_class(parser_name)
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self.parser = parser_class()
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def read(self, source, parser, settings):
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self.source = source
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if not self.parser:
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self.parser = parser
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self.settings = settings
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self.input = self.source.read()
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self.parse()
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return self.document
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def parse(self):
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"""Parse `self.input` into a document tree."""
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self.document = document = self.new_document()
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self.parser.parse(self.input, document)
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document.current_source = document.current_line = None
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def new_document(self):
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"""Create and return a new empty document tree (root node)."""
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document = utils.new_document(self.source.source_path, self.settings)
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return document
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class ReReader(Reader):
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"""
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A reader which rereads an existing document tree (e.g. a
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deserializer).
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Often used in conjunction with `writers.UnfilteredWriter`.
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"""
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def get_transforms(self):
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# Do not add any transforms. They have already been applied
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# by the reader which originally created the document.
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return Component.get_transforms(self)
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_reader_aliases = {}
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def get_reader_class(reader_name):
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"""Return the Reader class from the `reader_name` module."""
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reader_name = reader_name.lower()
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if reader_name in _reader_aliases:
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reader_name = _reader_aliases[reader_name]
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try:
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module = __import__(reader_name, globals(), locals(), level=1)
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except ImportError:
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module = __import__(reader_name, globals(), locals(), level=0)
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return module.Reader
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