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env/lib/python3.10/site-packages/docutils/readers/__init__.py

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+# $Id: __init__.py 9258 2022-11-21 14:51:43Z milde $
+# Authors: David Goodger <goodger@python.org>; Ueli Schlaepfer
+# Copyright: This module has been placed in the public domain.
+
+"""
+This package contains Docutils Reader modules.
+"""
+
+__docformat__ = 'reStructuredText'
+
+from importlib import import_module
+
+from docutils import utils, parsers, Component
+from docutils.transforms import universal
+
+
+class Reader(Component):
+
+    """
+    Abstract base class for docutils Readers.
+
+    Each reader module or package must export a subclass also called 'Reader'.
+
+    The two steps of a Reader's responsibility are to read data from the
+    source Input object and parse the data with the Parser object.
+    Call `read()` to process a document.
+    """
+
+    component_type = 'reader'
+    config_section = 'readers'
+
+    def get_transforms(self):
+        return super().get_transforms() + [universal.Decorations,
+                                           universal.ExposeInternals,
+                                           universal.StripComments]
+
+    def __init__(self, parser=None, parser_name=None):
+        """
+        Initialize the Reader instance.
+
+        Several instance attributes are defined with dummy initial values.
+        Subclasses may use these attributes as they wish.
+        """
+
+        self.parser = parser
+        """A `parsers.Parser` instance shared by all doctrees.  May be left
+        unspecified if the document source determines the parser."""
+
+        if parser is None and parser_name:
+            self.set_parser(parser_name)
+
+        self.source = None
+        """`docutils.io` IO object, source of input data."""
+
+        self.input = None
+        """Raw text input; either a single string or, for more complex cases,
+        a collection of strings."""
+
+    def set_parser(self, parser_name):
+        """Set `self.parser` by name."""
+        parser_class = parsers.get_parser_class(parser_name)
+        self.parser = parser_class()
+
+    def read(self, source, parser, settings):
+        self.source = source
+        if not self.parser:
+            self.parser = parser
+        self.settings = settings
+        self.input = self.source.read()
+        self.parse()
+        return self.document
+
+    def parse(self):
+        """Parse `self.input` into a document tree."""
+        self.document = document = self.new_document()
+        self.parser.parse(self.input, document)
+        document.current_source = document.current_line = None
+
+    def new_document(self):
+        """Create and return a new empty document tree (root node)."""
+        return utils.new_document(self.source.source_path, self.settings)
+
+
+class ReReader(Reader):
+
+    """
+    A reader which rereads an existing document tree (e.g. a
+    deserializer).
+
+    Often used in conjunction with `writers.UnfilteredWriter`.
+    """
+
+    def get_transforms(self):
+        # Do not add any transforms.  They have already been applied
+        # by the reader which originally created the document.
+        return Component.get_transforms(self)
+
+
+_reader_aliases = {}
+
+
+def get_reader_class(reader_name):
+    """Return the Reader class from the `reader_name` module."""
+    name = reader_name.lower()
+    name = _reader_aliases.get(name, name)
+    try:
+        module = import_module('docutils.readers.'+name)
+    except ImportError:
+        try:
+            module = import_module(name)
+        except ImportError as err:
+            raise ImportError(f'Reader "{reader_name}" not found. {err}')
+    return module.Reader