113 lines
3.4 KiB
Python
113 lines
3.4 KiB
Python
# $Id: __init__.py 8239 2018-11-21 21:46:00Z 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'
|
|
|
|
import sys
|
|
|
|
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 Component.get_transforms(self) + [
|
|
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)."""
|
|
document = utils.new_document(self.source.source_path, self.settings)
|
|
return document
|
|
|
|
|
|
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."""
|
|
reader_name = reader_name.lower()
|
|
if reader_name in _reader_aliases:
|
|
reader_name = _reader_aliases[reader_name]
|
|
try:
|
|
module = __import__(reader_name, globals(), locals(), level=1)
|
|
except ImportError:
|
|
module = __import__(reader_name, globals(), locals(), level=0)
|
|
return module.Reader
|