665 lines
29 KiB
Python
665 lines
29 KiB
Python
# $Id: core.py 8126 2017-06-23 09:34:28Z 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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Calling the ``publish_*`` convenience functions (or instantiating a
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`Publisher` object) with component names will result in default
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behavior. For custom behavior (setting component options), create
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custom component objects first, and pass *them* to
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``publish_*``/`Publisher`. See `The Docutils Publisher`_.
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.. _The Docutils Publisher: http://docutils.sf.net/docs/api/publisher.html
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"""
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__docformat__ = 'reStructuredText'
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import sys
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import pprint
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from docutils import __version__, __version_details__, SettingsSpec
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from docutils import frontend, io, utils, readers, writers
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from docutils.frontend import OptionParser
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from docutils.transforms import Transformer
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from docutils.utils.error_reporting import ErrorOutput, ErrorString
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import docutils.readers.doctree
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class Publisher:
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"""
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A facade encapsulating the high-level logic of a Docutils system.
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"""
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def __init__(self, reader=None, parser=None, writer=None,
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source=None, source_class=io.FileInput,
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destination=None, destination_class=io.FileOutput,
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settings=None):
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"""
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Initial setup. If any of `reader`, `parser`, or `writer` are not
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specified, the corresponding ``set_...`` method should be called with
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a component name (`set_reader` sets the parser as well).
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"""
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self.document = None
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"""The document tree (`docutils.nodes` objects)."""
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self.reader = reader
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"""A `docutils.readers.Reader` instance."""
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self.parser = parser
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"""A `docutils.parsers.Parser` instance."""
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self.writer = writer
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"""A `docutils.writers.Writer` instance."""
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for component in 'reader', 'parser', 'writer':
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assert not isinstance(getattr(self, component), str), (
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'passed string "%s" as "%s" parameter; pass an instance, '
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'or use the "%s_name" parameter instead (in '
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'docutils.core.publish_* convenience functions).'
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% (getattr(self, component), component, component))
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self.source = source
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"""The source of input data, a `docutils.io.Input` instance."""
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self.source_class = source_class
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"""The class for dynamically created source objects."""
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self.destination = destination
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"""The destination for docutils output, a `docutils.io.Output`
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instance."""
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self.destination_class = destination_class
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"""The class for dynamically created destination objects."""
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self.settings = settings
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"""An object containing Docutils settings as instance attributes.
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Set by `self.process_command_line()` or `self.get_settings()`."""
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self._stderr = ErrorOutput()
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def set_reader(self, reader_name, parser, parser_name):
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"""Set `self.reader` by name."""
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reader_class = readers.get_reader_class(reader_name)
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self.reader = reader_class(parser, parser_name)
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self.parser = self.reader.parser
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def set_writer(self, writer_name):
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"""Set `self.writer` by name."""
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writer_class = writers.get_writer_class(writer_name)
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self.writer = writer_class()
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def set_components(self, reader_name, parser_name, writer_name):
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if self.reader is None:
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self.set_reader(reader_name, self.parser, parser_name)
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if self.parser is None:
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if self.reader.parser is None:
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self.reader.set_parser(parser_name)
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self.parser = self.reader.parser
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if self.writer is None:
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self.set_writer(writer_name)
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def setup_option_parser(self, usage=None, description=None,
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settings_spec=None, config_section=None,
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**defaults):
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if config_section:
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if not settings_spec:
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settings_spec = SettingsSpec()
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settings_spec.config_section = config_section
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parts = config_section.split()
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if len(parts) > 1 and parts[-1] == 'application':
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settings_spec.config_section_dependencies = ['applications']
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#@@@ Add self.source & self.destination to components in future?
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option_parser = OptionParser(
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components=(self.parser, self.reader, self.writer, settings_spec),
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defaults=defaults, read_config_files=True,
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usage=usage, description=description)
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return option_parser
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def get_settings(self, usage=None, description=None,
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settings_spec=None, config_section=None, **defaults):
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"""
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Set and return default settings (overrides in `defaults` dict).
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Set components first (`self.set_reader` & `self.set_writer`).
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Explicitly setting `self.settings` disables command line option
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processing from `self.publish()`.
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"""
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option_parser = self.setup_option_parser(
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usage, description, settings_spec, config_section, **defaults)
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self.settings = option_parser.get_default_values()
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return self.settings
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def process_programmatic_settings(self, settings_spec,
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settings_overrides,
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config_section):
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if self.settings is None:
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defaults = (settings_overrides or {}).copy()
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# Propagate exceptions by default when used programmatically:
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defaults.setdefault('traceback', True)
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self.get_settings(settings_spec=settings_spec,
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config_section=config_section,
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**defaults)
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def process_command_line(self, argv=None, usage=None, description=None,
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settings_spec=None, config_section=None,
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**defaults):
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"""
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Pass an empty list to `argv` to avoid reading `sys.argv` (the
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default).
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Set components first (`self.set_reader` & `self.set_writer`).
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"""
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option_parser = self.setup_option_parser(
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usage, description, settings_spec, config_section, **defaults)
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if argv is None:
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argv = sys.argv[1:]
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# converting to Unicode (Python 3 does this automatically):
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if sys.version_info < (3,0):
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# TODO: make this failsafe and reversible?
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argv_encoding = (frontend.locale_encoding or 'ascii')
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argv = [a.decode(argv_encoding) for a in argv]
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self.settings = option_parser.parse_args(argv)
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def set_io(self, source_path=None, destination_path=None):
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if self.source is None:
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self.set_source(source_path=source_path)
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if self.destination is None:
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self.set_destination(destination_path=destination_path)
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def set_source(self, source=None, source_path=None):
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if source_path is None:
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source_path = self.settings._source
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else:
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self.settings._source = source_path
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# Raise IOError instead of system exit with `tracback == True`
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# TODO: change io.FileInput's default behaviour and remove this hack
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try:
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self.source = self.source_class(
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source=source, source_path=source_path,
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encoding=self.settings.input_encoding)
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except TypeError:
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self.source = self.source_class(
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source=source, source_path=source_path,
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encoding=self.settings.input_encoding)
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def set_destination(self, destination=None, destination_path=None):
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if destination_path is None:
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destination_path = self.settings._destination
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else:
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self.settings._destination = destination_path
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self.destination = self.destination_class(
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destination=destination, destination_path=destination_path,
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encoding=self.settings.output_encoding,
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error_handler=self.settings.output_encoding_error_handler)
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def apply_transforms(self):
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self.document.transformer.populate_from_components(
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(self.source, self.reader, self.reader.parser, self.writer,
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self.destination))
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self.document.transformer.apply_transforms()
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def publish(self, argv=None, usage=None, description=None,
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settings_spec=None, settings_overrides=None,
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config_section=None, enable_exit_status=False):
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"""
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Process command line options and arguments (if `self.settings` not
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already set), run `self.reader` and then `self.writer`. Return
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`self.writer`'s output.
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"""
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exit = None
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try:
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if self.settings is None:
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self.process_command_line(
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argv, usage, description, settings_spec, config_section,
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**(settings_overrides or {}))
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self.set_io()
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self.document = self.reader.read(self.source, self.parser,
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self.settings)
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self.apply_transforms()
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output = self.writer.write(self.document, self.destination)
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self.writer.assemble_parts()
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except SystemExit as error:
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exit = 1
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exit_status = error.code
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except Exception as error:
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if not self.settings: # exception too early to report nicely
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raise
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if self.settings.traceback: # Propagate exceptions?
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self.debugging_dumps()
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raise
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self.report_Exception(error)
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exit = True
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exit_status = 1
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self.debugging_dumps()
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if (enable_exit_status and self.document
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and (self.document.reporter.max_level
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>= self.settings.exit_status_level)):
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sys.exit(self.document.reporter.max_level + 10)
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elif exit:
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sys.exit(exit_status)
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return output
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def debugging_dumps(self):
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if not self.document:
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return
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if self.settings.dump_settings:
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print('\n::: Runtime settings:', file=self._stderr)
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print(pprint.pformat(self.settings.__dict__), file=self._stderr)
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if self.settings.dump_internals:
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print('\n::: Document internals:', file=self._stderr)
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print(pprint.pformat(self.document.__dict__), file=self._stderr)
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if self.settings.dump_transforms:
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print('\n::: Transforms applied:', file=self._stderr)
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print((' (priority, transform class, '
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'pending node details, keyword args)'), file=self._stderr)
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print(pprint.pformat(
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[(priority, '%s.%s' % (xclass.__module__, xclass.__name__),
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pending and pending.details, kwargs)
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for priority, xclass, pending, kwargs
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in self.document.transformer.applied]), file=self._stderr)
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if self.settings.dump_pseudo_xml:
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print('\n::: Pseudo-XML:', file=self._stderr)
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print(self.document.pformat().encode(
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'raw_unicode_escape'), file=self._stderr)
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def report_Exception(self, error):
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if isinstance(error, utils.SystemMessage):
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self.report_SystemMessage(error)
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elif isinstance(error, UnicodeEncodeError):
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self.report_UnicodeError(error)
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elif isinstance(error, io.InputError):
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self._stderr.write('Unable to open source file for reading:\n'
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' %s\n' % ErrorString(error))
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elif isinstance(error, io.OutputError):
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self._stderr.write(
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'Unable to open destination file for writing:\n'
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' %s\n' % ErrorString(error))
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else:
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print('%s' % ErrorString(error), file=self._stderr)
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print(("""\
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Exiting due to error. Use "--traceback" to diagnose.
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Please report errors to <docutils-users@lists.sf.net>.
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Include "--traceback" output, Docutils version (%s%s),
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Python version (%s), your OS type & version, and the
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command line used.""" % (__version__,
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docutils.__version_details__ and
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' [%s]'%docutils.__version_details__ or '',
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sys.version.split()[0])), file=self._stderr)
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def report_SystemMessage(self, error):
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print(('Exiting due to level-%s (%s) system message.'
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% (error.level,
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utils.Reporter.levels[error.level])), file=self._stderr)
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def report_UnicodeError(self, error):
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data = error.object[error.start:error.end]
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self._stderr.write(
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'%s\n'
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'\n'
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'The specified output encoding (%s) cannot\n'
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'handle all of the output.\n'
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'Try setting "--output-encoding-error-handler" to\n'
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'\n'
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'* "xmlcharrefreplace" (for HTML & XML output);\n'
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' the output will contain "%s" and should be usable.\n'
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'* "backslashreplace" (for other output formats);\n'
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' look for "%s" in the output.\n'
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'* "replace"; look for "?" in the output.\n'
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'\n'
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'"--output-encoding-error-handler" is currently set to "%s".\n'
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'\n'
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'Exiting due to error. Use "--traceback" to diagnose.\n'
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'If the advice above doesn\'t eliminate the error,\n'
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'please report it to <docutils-users@lists.sf.net>.\n'
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'Include "--traceback" output, Docutils version (%s),\n'
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'Python version (%s), your OS type & version, and the\n'
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'command line used.\n'
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% (ErrorString(error),
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self.settings.output_encoding,
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data.encode('ascii', 'xmlcharrefreplace'),
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data.encode('ascii', 'backslashreplace'),
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self.settings.output_encoding_error_handler,
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__version__, sys.version.split()[0]))
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default_usage = '%prog [options] [<source> [<destination>]]'
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default_description = ('Reads from <source> (default is stdin) and writes to '
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'<destination> (default is stdout). See '
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'<http://docutils.sf.net/docs/user/config.html> for '
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'the full reference.')
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def publish_cmdline(reader=None, reader_name='standalone',
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parser=None, parser_name='restructuredtext',
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writer=None, writer_name='pseudoxml',
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settings=None, settings_spec=None,
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settings_overrides=None, config_section=None,
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enable_exit_status=True, argv=None,
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usage=default_usage, description=default_description):
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"""
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Set up & run a `Publisher` for command-line-based file I/O (input and
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output file paths taken automatically from the command line). Return the
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encoded string output also.
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Parameters: see `publish_programmatically` for the remainder.
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- `argv`: Command-line argument list to use instead of ``sys.argv[1:]``.
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- `usage`: Usage string, output if there's a problem parsing the command
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line.
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- `description`: Program description, output for the "--help" option
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(along with command-line option descriptions).
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"""
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pub = Publisher(reader, parser, writer, settings=settings)
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pub.set_components(reader_name, parser_name, writer_name)
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output = pub.publish(
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argv, usage, description, settings_spec, settings_overrides,
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config_section=config_section, enable_exit_status=enable_exit_status)
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return output
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def publish_file(source=None, source_path=None,
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destination=None, destination_path=None,
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reader=None, reader_name='standalone',
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parser=None, parser_name='restructuredtext',
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writer=None, writer_name='pseudoxml',
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settings=None, settings_spec=None, settings_overrides=None,
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config_section=None, enable_exit_status=False):
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"""
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Set up & run a `Publisher` for programmatic use with file-like I/O.
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Return the encoded string output also.
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Parameters: see `publish_programmatically`.
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"""
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output, pub = publish_programmatically(
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source_class=io.FileInput, source=source, source_path=source_path,
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destination_class=io.FileOutput,
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destination=destination, destination_path=destination_path,
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reader=reader, reader_name=reader_name,
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parser=parser, parser_name=parser_name,
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writer=writer, writer_name=writer_name,
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settings=settings, settings_spec=settings_spec,
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settings_overrides=settings_overrides,
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config_section=config_section,
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enable_exit_status=enable_exit_status)
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return output
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def publish_string(source, source_path=None, destination_path=None,
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reader=None, reader_name='standalone',
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parser=None, parser_name='restructuredtext',
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writer=None, writer_name='pseudoxml',
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settings=None, settings_spec=None,
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settings_overrides=None, config_section=None,
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enable_exit_status=False):
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"""
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Set up & run a `Publisher` for programmatic use with string I/O. Return
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the encoded string or Unicode string output.
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For encoded string output, be sure to set the 'output_encoding' setting to
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the desired encoding. Set it to 'unicode' for unencoded Unicode string
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output. Here's one way::
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publish_string(..., settings_overrides={'output_encoding': 'unicode'})
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Similarly for Unicode string input (`source`)::
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publish_string(..., settings_overrides={'input_encoding': 'unicode'})
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Parameters: see `publish_programmatically`.
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"""
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output, pub = publish_programmatically(
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source_class=io.StringInput, source=source, source_path=source_path,
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destination_class=io.StringOutput,
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destination=None, destination_path=destination_path,
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reader=reader, reader_name=reader_name,
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parser=parser, parser_name=parser_name,
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writer=writer, writer_name=writer_name,
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settings=settings, settings_spec=settings_spec,
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settings_overrides=settings_overrides,
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config_section=config_section,
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enable_exit_status=enable_exit_status)
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return output
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def publish_parts(source, source_path=None, source_class=io.StringInput,
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destination_path=None,
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reader=None, reader_name='standalone',
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parser=None, parser_name='restructuredtext',
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writer=None, writer_name='pseudoxml',
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settings=None, settings_spec=None,
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settings_overrides=None, config_section=None,
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enable_exit_status=False):
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"""
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Set up & run a `Publisher`, and return a dictionary of document parts.
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Dictionary keys are the names of parts, and values are Unicode strings;
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encoding is up to the client. For programmatic use with string I/O.
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For encoded string input, be sure to set the 'input_encoding' setting to
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the desired encoding. Set it to 'unicode' for unencoded Unicode string
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input. Here's how::
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publish_parts(..., settings_overrides={'input_encoding': 'unicode'})
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Parameters: see `publish_programmatically`.
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"""
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output, pub = publish_programmatically(
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source=source, source_path=source_path, source_class=source_class,
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destination_class=io.StringOutput,
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destination=None, destination_path=destination_path,
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reader=reader, reader_name=reader_name,
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parser=parser, parser_name=parser_name,
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writer=writer, writer_name=writer_name,
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settings=settings, settings_spec=settings_spec,
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settings_overrides=settings_overrides,
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config_section=config_section,
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enable_exit_status=enable_exit_status)
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return pub.writer.parts
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def publish_doctree(source, source_path=None,
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source_class=io.StringInput,
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reader=None, reader_name='standalone',
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parser=None, parser_name='restructuredtext',
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settings=None, settings_spec=None,
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settings_overrides=None, config_section=None,
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enable_exit_status=False):
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"""
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Set up & run a `Publisher` for programmatic use with string I/O.
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Return the document tree.
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For encoded string input, be sure to set the 'input_encoding' setting to
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the desired encoding. Set it to 'unicode' for unencoded Unicode string
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input. Here's one way::
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publish_doctree(..., settings_overrides={'input_encoding': 'unicode'})
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Parameters: see `publish_programmatically`.
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"""
|
|
pub = Publisher(reader=reader, parser=parser, writer=None,
|
|
settings=settings,
|
|
source_class=source_class,
|
|
destination_class=io.NullOutput)
|
|
pub.set_components(reader_name, parser_name, 'null')
|
|
pub.process_programmatic_settings(
|
|
settings_spec, settings_overrides, config_section)
|
|
pub.set_source(source, source_path)
|
|
pub.set_destination(None, None)
|
|
output = pub.publish(enable_exit_status=enable_exit_status)
|
|
return pub.document
|
|
|
|
def publish_from_doctree(document, destination_path=None,
|
|
writer=None, writer_name='pseudoxml',
|
|
settings=None, settings_spec=None,
|
|
settings_overrides=None, config_section=None,
|
|
enable_exit_status=False):
|
|
"""
|
|
Set up & run a `Publisher` to render from an existing document
|
|
tree data structure, for programmatic use with string I/O. Return
|
|
the encoded string output.
|
|
|
|
Note that document.settings is overridden; if you want to use the settings
|
|
of the original `document`, pass settings=document.settings.
|
|
|
|
Also, new document.transformer and document.reporter objects are
|
|
generated.
|
|
|
|
For encoded string output, be sure to set the 'output_encoding' setting to
|
|
the desired encoding. Set it to 'unicode' for unencoded Unicode string
|
|
output. Here's one way::
|
|
|
|
publish_from_doctree(
|
|
..., settings_overrides={'output_encoding': 'unicode'})
|
|
|
|
Parameters: `document` is a `docutils.nodes.document` object, an existing
|
|
document tree.
|
|
|
|
Other parameters: see `publish_programmatically`.
|
|
"""
|
|
reader = docutils.readers.doctree.Reader(parser_name='null')
|
|
pub = Publisher(reader, None, writer,
|
|
source=io.DocTreeInput(document),
|
|
destination_class=io.StringOutput, settings=settings)
|
|
if not writer and writer_name:
|
|
pub.set_writer(writer_name)
|
|
pub.process_programmatic_settings(
|
|
settings_spec, settings_overrides, config_section)
|
|
pub.set_destination(None, destination_path)
|
|
return pub.publish(enable_exit_status=enable_exit_status)
|
|
|
|
def publish_cmdline_to_binary(reader=None, reader_name='standalone',
|
|
parser=None, parser_name='restructuredtext',
|
|
writer=None, writer_name='pseudoxml',
|
|
settings=None, settings_spec=None,
|
|
settings_overrides=None, config_section=None,
|
|
enable_exit_status=True, argv=None,
|
|
usage=default_usage, description=default_description,
|
|
destination=None, destination_class=io.BinaryFileOutput
|
|
):
|
|
"""
|
|
Set up & run a `Publisher` for command-line-based file I/O (input and
|
|
output file paths taken automatically from the command line). Return the
|
|
encoded string output also.
|
|
|
|
This is just like publish_cmdline, except that it uses
|
|
io.BinaryFileOutput instead of io.FileOutput.
|
|
|
|
Parameters: see `publish_programmatically` for the remainder.
|
|
|
|
- `argv`: Command-line argument list to use instead of ``sys.argv[1:]``.
|
|
- `usage`: Usage string, output if there's a problem parsing the command
|
|
line.
|
|
- `description`: Program description, output for the "--help" option
|
|
(along with command-line option descriptions).
|
|
"""
|
|
pub = Publisher(reader, parser, writer, settings=settings,
|
|
destination_class=destination_class)
|
|
pub.set_components(reader_name, parser_name, writer_name)
|
|
output = pub.publish(
|
|
argv, usage, description, settings_spec, settings_overrides,
|
|
config_section=config_section, enable_exit_status=enable_exit_status)
|
|
return output
|
|
|
|
def publish_programmatically(source_class, source, source_path,
|
|
destination_class, destination, destination_path,
|
|
reader, reader_name,
|
|
parser, parser_name,
|
|
writer, writer_name,
|
|
settings, settings_spec,
|
|
settings_overrides, config_section,
|
|
enable_exit_status):
|
|
"""
|
|
Set up & run a `Publisher` for custom programmatic use. Return the
|
|
encoded string output and the Publisher object.
|
|
|
|
Applications should not need to call this function directly. If it does
|
|
seem to be necessary to call this function directly, please write to the
|
|
Docutils-develop mailing list
|
|
<http://docutils.sf.net/docs/user/mailing-lists.html#docutils-develop>.
|
|
|
|
Parameters:
|
|
|
|
* `source_class` **required**: The class for dynamically created source
|
|
objects. Typically `io.FileInput` or `io.StringInput`.
|
|
|
|
* `source`: Type depends on `source_class`:
|
|
|
|
- If `source_class` is `io.FileInput`: Either a file-like object
|
|
(must have 'read' and 'close' methods), or ``None``
|
|
(`source_path` is opened). If neither `source` nor
|
|
`source_path` are supplied, `sys.stdin` is used.
|
|
|
|
- If `source_class` is `io.StringInput` **required**: The input
|
|
string, either an encoded 8-bit string (set the
|
|
'input_encoding' setting to the correct encoding) or a Unicode
|
|
string (set the 'input_encoding' setting to 'unicode').
|
|
|
|
* `source_path`: Type depends on `source_class`:
|
|
|
|
- `io.FileInput`: Path to the input file, opened if no `source`
|
|
supplied.
|
|
|
|
- `io.StringInput`: Optional. Path to the file or object that produced
|
|
`source`. Only used for diagnostic output.
|
|
|
|
* `destination_class` **required**: The class for dynamically created
|
|
destination objects. Typically `io.FileOutput` or `io.StringOutput`.
|
|
|
|
* `destination`: Type depends on `destination_class`:
|
|
|
|
- `io.FileOutput`: Either a file-like object (must have 'write' and
|
|
'close' methods), or ``None`` (`destination_path` is opened). If
|
|
neither `destination` nor `destination_path` are supplied,
|
|
`sys.stdout` is used.
|
|
|
|
- `io.StringOutput`: Not used; pass ``None``.
|
|
|
|
* `destination_path`: Type depends on `destination_class`:
|
|
|
|
- `io.FileOutput`: Path to the output file. Opened if no `destination`
|
|
supplied.
|
|
|
|
- `io.StringOutput`: Path to the file or object which will receive the
|
|
output; optional. Used for determining relative paths (stylesheets,
|
|
source links, etc.).
|
|
|
|
* `reader`: A `docutils.readers.Reader` object.
|
|
|
|
* `reader_name`: Name or alias of the Reader class to be instantiated if
|
|
no `reader` supplied.
|
|
|
|
* `parser`: A `docutils.parsers.Parser` object.
|
|
|
|
* `parser_name`: Name or alias of the Parser class to be instantiated if
|
|
no `parser` supplied.
|
|
|
|
* `writer`: A `docutils.writers.Writer` object.
|
|
|
|
* `writer_name`: Name or alias of the Writer class to be instantiated if
|
|
no `writer` supplied.
|
|
|
|
* `settings`: A runtime settings (`docutils.frontend.Values`) object, for
|
|
dotted-attribute access to runtime settings. It's the end result of the
|
|
`SettingsSpec`, config file, and option processing. If `settings` is
|
|
passed, it's assumed to be complete and no further setting/config/option
|
|
processing is done.
|
|
|
|
* `settings_spec`: A `docutils.SettingsSpec` subclass or object. Provides
|
|
extra application-specific settings definitions independently of
|
|
components. In other words, the application becomes a component, and
|
|
its settings data is processed along with that of the other components.
|
|
Used only if no `settings` specified.
|
|
|
|
* `settings_overrides`: A dictionary containing application-specific
|
|
settings defaults that override the defaults of other components.
|
|
Used only if no `settings` specified.
|
|
|
|
* `config_section`: A string, the name of the configuration file section
|
|
for this application. Overrides the ``config_section`` attribute
|
|
defined by `settings_spec`. Used only if no `settings` specified.
|
|
|
|
* `enable_exit_status`: Boolean; enable exit status at end of processing?
|
|
"""
|
|
pub = Publisher(reader, parser, writer, settings=settings,
|
|
source_class=source_class,
|
|
destination_class=destination_class)
|
|
pub.set_components(reader_name, parser_name, writer_name)
|
|
pub.process_programmatic_settings(
|
|
settings_spec, settings_overrides, config_section)
|
|
pub.set_source(source, source_path)
|
|
pub.set_destination(destination, destination_path)
|
|
output = pub.publish(enable_exit_status=enable_exit_status)
|
|
return output, pub
|