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# $Id: core.py 9369 2023-05-02 23:04:27Z milde $ # Author: David Goodger <goodger@python.org> # Copyright: This module has been placed in the public domain. """ Calling the ``publish_*`` convenience functions (or instantiating a `Publisher` object) with component names will result in default behavior. For custom behavior (setting component options), create custom component objects first, and pass *them* to ``publish_*``/`Publisher`. See `The Docutils Publisher`_. .. _The Docutils Publisher: https://docutils.sourceforge.io/docs/api/publisher.html """ __docformat__ = 'reStructuredText' import locale import pprint import os import sys import warnings from docutils import (__version__, __version_details__, SettingsSpec, io, utils, readers, writers) from docutils.frontend import OptionParser from docutils.readers import doctree class Publisher: """ A facade encapsulating the high-level logic of a Docutils system. """ def __init__(self, reader=None, parser=None, writer=None, source=None, source_class=io.FileInput, destination=None, destination_class=io.FileOutput, settings=None): """ Initial setup. If any of `reader`, `parser`, or `writer` are not specified, ``set_components()`` or the corresponding ``set_...()`` method should be called with component names (`set_reader` sets the parser as well). """ self.document = None """The document tree (`docutils.nodes` objects).""" self.reader = reader """A `docutils.readers.Reader` instance.""" self.parser = parser """A `docutils.parsers.Parser` instance.""" self.writer = writer """A `docutils.writers.Writer` instance.""" for component in 'reader', 'parser', 'writer': assert not isinstance(getattr(self, component), str), ( 'passed string "%s" as "%s" parameter; pass an instance, ' 'or use the "%s_name" parameter instead (in ' 'docutils.core.publish_* convenience functions).' % (getattr(self, component), component, component)) self.source = source """The source of input data, a `docutils.io.Input` instance.""" self.source_class = source_class """The class for dynamically created source objects.""" self.destination = destination """The destination for docutils output, a `docutils.io.Output` instance.""" self.destination_class = destination_class """The class for dynamically created destination objects.""" self.settings = settings """An object containing Docutils settings as instance attributes. Set by `self.process_command_line()` or `self.get_settings()`.""" self._stderr = io.ErrorOutput() def set_reader(self, reader_name, parser, parser_name): """Set `self.reader` by name.""" reader_class = readers.get_reader_class(reader_name) self.reader = reader_class(parser, parser_name) self.parser = self.reader.parser def set_writer(self, writer_name): """Set `self.writer` by name.""" writer_class = writers.get_writer_class(writer_name) self.writer = writer_class() def set_components(self, reader_name, parser_name, writer_name): if self.reader is None: self.set_reader(reader_name, self.parser, parser_name) if self.parser is None: if self.reader.parser is None: self.reader.set_parser(parser_name) self.parser = self.reader.parser if self.writer is None: self.set_writer(writer_name) def setup_option_parser(self, usage=None, description=None, settings_spec=None, config_section=None, **defaults): warnings.warn('Publisher.setup_option_parser is deprecated, ' 'and will be removed in Docutils 0.21.', DeprecationWarning, stacklevel=2) if config_section: if not settings_spec: settings_spec = SettingsSpec() settings_spec.config_section = config_section parts = config_section.split() if len(parts) > 1 and parts[-1] == 'application': settings_spec.config_section_dependencies = ['applications'] # @@@ Add self.source & self.destination to components in future? return OptionParser( components=(self.parser, self.reader, self.writer, settings_spec), defaults=defaults, read_config_files=True, usage=usage, description=description) def _setup_settings_parser(self, *args, **kwargs): # Provisional: will change (docutils.frontend.OptionParser will # be replaced by a parser based on arparse.ArgumentParser) # and may be removed later. with warnings.catch_warnings(): warnings.filterwarnings('ignore', category=DeprecationWarning) return self.setup_option_parser(*args, **kwargs) def get_settings(self, usage=None, description=None, settings_spec=None, config_section=None, **defaults): """ Return settings from components and config files. Please set components first (`self.set_reader` & `self.set_writer`). Use keyword arguments to override component defaults (before updating from configuration files). Calling this function also sets `self.settings` which makes `self.publish()` skip parsing command line options. """ option_parser = self._setup_settings_parser( usage, description, settings_spec, config_section, **defaults) self.settings = option_parser.get_default_values() return self.settings def process_programmatic_settings(self, settings_spec, settings_overrides, config_section): if self.settings is None: defaults = settings_overrides.copy() if settings_overrides else {} # Propagate exceptions by default when used programmatically: defaults.setdefault('traceback', True) self.get_settings(settings_spec=settings_spec, config_section=config_section, **defaults) def process_command_line(self, argv=None, usage=None, description=None, settings_spec=None, config_section=None, **defaults): """ Parse command line arguments and set ``self.settings``. Pass an empty sequence to `argv` to avoid reading `sys.argv` (the default behaviour). Set components first (`self.set_reader` & `self.set_writer`). """ option_parser = self._setup_settings_parser( usage, description, settings_spec, config_section, **defaults) if argv is None: argv = sys.argv[1:] self.settings = option_parser.parse_args(argv) def set_io(self, source_path=None, destination_path=None): if self.source is None: self.set_source(source_path=source_path) if self.destination is None: self.set_destination(destination_path=destination_path) def set_source(self, source=None, source_path=None): if source_path is None: source_path = self.settings._source else: self.settings._source = source_path self.source = self.source_class( source=source, source_path=source_path, encoding=self.settings.input_encoding, error_handler=self.settings.input_encoding_error_handler) def set_destination(self, destination=None, destination_path=None): if destination_path is None: if (self.settings.output and self.settings._destination and self.settings.output != self.settings._destination): raise SystemExit('The positional argument <destination> is ' 'obsoleted by the --output option. ' 'You cannot use them together.') if self.settings.output == '-': # means stdout self.settings.output = None destination_path = (self.settings.output or self.settings._destination) self.settings._destination = destination_path self.destination = self.destination_class( destination=destination, destination_path=destination_path, encoding=self.settings.output_encoding, error_handler=self.settings.output_encoding_error_handler) def apply_transforms(self): self.document.transformer.populate_from_components( (self.source, self.reader, self.reader.parser, self.writer, self.destination)) self.document.transformer.apply_transforms() def publish(self, argv=None, usage=None, description=None, settings_spec=None, settings_overrides=None, config_section=None, enable_exit_status=False): """ Process command line options and arguments (if `self.settings` not already set), run `self.reader` and then `self.writer`. Return `self.writer`'s output. """ exit = None try: if self.settings is None: self.process_command_line( argv, usage, description, settings_spec, config_section, **(settings_overrides or {})) self.set_io() self.prompt() self.document = self.reader.read(self.source, self.parser, self.settings) self.apply_transforms() output = self.writer.write(self.document, self.destination) self.writer.assemble_parts() except SystemExit as error: exit = True exit_status = error.code except Exception as error: if not self.settings: # exception too early to report nicely raise if self.settings.traceback: # Propagate exceptions? self.debugging_dumps() raise self.report_Exception(error) exit = True exit_status = 1 self.debugging_dumps() if (enable_exit_status and self.document and (self.document.reporter.max_level >= self.settings.exit_status_level)): sys.exit(self.document.reporter.max_level + 10) elif exit: sys.exit(exit_status) return output def debugging_dumps(self): if not self.document: return if self.settings.dump_settings: print('\n::: Runtime settings:', file=self._stderr) print(pprint.pformat(self.settings.__dict__), file=self._stderr) if self.settings.dump_internals: print('\n::: Document internals:', file=self._stderr) print(pprint.pformat(self.document.__dict__), file=self._stderr) if self.settings.dump_transforms: print('\n::: Transforms applied:', file=self._stderr) print(' (priority, transform class, pending node details, ' 'keyword args)', file=self._stderr) print(pprint.pformat( [(priority, '%s.%s' % (xclass.__module__, xclass.__name__), pending and pending.details, kwargs) for priority, xclass, pending, kwargs in self.document.transformer.applied]), file=self._stderr) if self.settings.dump_pseudo_xml: print('\n::: Pseudo-XML:', file=self._stderr) print(self.document.pformat().encode( 'raw_unicode_escape'), file=self._stderr) def prompt(self): """Print info and prompt when waiting for input from a terminal.""" try: if not (self.source.isatty() and self._stderr.isatty()): return except AttributeError: return eot_key = 'Ctrl+Z' if os.name == 'nt' else 'Ctrl+D' in_format = '' out_format = 'useful formats' try: in_format = self.parser.supported[0] out_format = self.writer.supported[0] except (AttributeError, IndexError): pass print(f'Docutils {__version__} <https://docutils.sourceforge.io>\n' f'converting "{in_format}" into "{out_format}".\n' f'Call with option "--help" for more info.\n' f'.. Waiting for source text (finish with {eot_key} ' 'on an empty line):', file=self._stderr) def report_Exception(self, error): if isinstance(error, utils.SystemMessage): self.report_SystemMessage(error) elif isinstance(error, UnicodeEncodeError): self.report_UnicodeError(error) elif isinstance(error, io.InputError): self._stderr.write('Unable to open source file for reading:\n' ' %s\n' % io.error_string(error)) elif isinstance(error, io.OutputError): self._stderr.write( 'Unable to open destination file for writing:\n' ' %s\n' % io.error_string(error)) else: print('%s' % io.error_string(error), file=self._stderr) print(f"""\ Exiting due to error. Use "--traceback" to diagnose. Please report errors to <docutils-users@lists.sourceforge.net>. Include "--traceback" output, Docutils version ({__version__}\ {f' [{__version_details__}]' if __version_details__ else ''}), Python version ({sys.version.split()[0]}), your OS type & version, \ and the command line used.""", file=self._stderr) def report_SystemMessage(self, error): print('Exiting due to level-%s (%s) system message.' % ( error.level, utils.Reporter.levels[error.level]), file=self._stderr) def report_UnicodeError(self, error): data = error.object[error.start:error.end] self._stderr.write( '%s\n' '\n' 'The specified output encoding (%s) cannot\n' 'handle all of the output.\n' 'Try setting "--output-encoding-error-handler" to\n' '\n' '* "xmlcharrefreplace" (for HTML & XML output);\n' ' the output will contain "%s" and should be usable.\n' '* "backslashreplace" (for other output formats);\n' ' look for "%s" in the output.\n' '* "replace"; look for "?" in the output.\n' '\n' '"--output-encoding-error-handler" is currently set to "%s".\n' '\n' 'Exiting due to error. Use "--traceback" to diagnose.\n' 'If the advice above doesn\'t eliminate the error,\n' 'please report it to <docutils-users@lists.sourceforge.net>.\n' 'Include "--traceback" output, Docutils version (%s),\n' 'Python version (%s), your OS type & version, and the\n' 'command line used.\n' % (io.error_string(error), self.settings.output_encoding, data.encode('ascii', 'xmlcharrefreplace'), data.encode('ascii', 'backslashreplace'), self.settings.output_encoding_error_handler, __version__, sys.version.split()[0])) default_usage = '%prog [options] [<source> [<destination>]]' default_description = ( 'Reads from <source> (default is stdin) ' 'and writes to <destination> (default is stdout). ' 'See https://docutils.sourceforge.io/docs/user/config.html ' 'for a detailed settings reference.') # TODO: or not to do? cf. https://clig.dev/#help # # Display output on success, but keep it brief. # Provide a -q option to suppress all non-essential output. # # Chain several args as input and use --output or redirection for output: # argparser.add_argument('source', nargs='+') # def publish_cmdline(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): """ Set up & run a `Publisher` for command-line-based file I/O (input and output file paths taken automatically from the command line). Also return the output as `str` or `bytes` (for binary output document formats). 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). """ publisher = Publisher(reader, parser, writer, settings=settings) publisher.set_components(reader_name, parser_name, writer_name) output = publisher.publish( argv, usage, description, settings_spec, settings_overrides, config_section=config_section, enable_exit_status=enable_exit_status) return output def publish_file(source=None, source_path=None, destination=None, destination_path=None, 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=False): """ Set up & run a `Publisher` for programmatic use with file-like I/O. Also return the output as `str` or `bytes` (for binary output document formats). Parameters: see `publish_programmatically()`. """ output, publisher = publish_programmatically( source_class=io.FileInput, source=source, source_path=source_path, destination_class=io.FileOutput, destination=destination, destination_path=destination_path, reader=reader, reader_name=reader_name, parser=parser, parser_name=parser_name, writer=writer, writer_name=writer_name, settings=settings, settings_spec=settings_spec, settings_overrides=settings_overrides, config_section=config_section, enable_exit_status=enable_exit_status) return output def publish_string(source, source_path=None, destination_path=None, 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=False): """ Set up & run a `Publisher` for programmatic use with string I/O. Accepts a `bytes` or `str` instance as `source`. The output is encoded according to the `output_encoding`_ setting; the return value is a `bytes` instance (unless `output_encoding`_ is "unicode", cf. `docutils.io.StringOutput.write()`). Parameters: see `publish_programmatically()`. This function is provisional because in Python 3 name and behaviour no longer match. .. _output_encoding: https://docutils.sourceforge.io/docs/user/config.html#output-encoding """ output, publisher = publish_programmatically( source_class=io.StringInput, source=source, source_path=source_path, destination_class=io.StringOutput, destination=None, destination_path=destination_path, reader=reader, reader_name=reader_name, parser=parser, parser_name=parser_name, writer=writer, writer_name=writer_name, settings=settings, settings_spec=settings_spec, settings_overrides=settings_overrides, config_section=config_section, enable_exit_status=enable_exit_status) return output def publish_parts(source, source_path=None, source_class=io.StringInput, destination_path=None, 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=False): """ Set up & run a `Publisher`, and return a dictionary of document parts. Dictionary keys are the names of parts. Dictionary values are `str` instances; encoding is up to the client, e.g.:: parts = publish_parts(...) body = parts['body'].encode(parts['encoding'], parts['errors']) See the `API documentation`__ for details on the provided parts. Parameters: see `publish_programmatically()`. __ https://docutils.sourceforge.io/docs/api/publisher.html#publish-parts """ output, publisher = publish_programmatically( source=source, source_path=source_path, source_class=source_class, destination_class=io.StringOutput, destination=None, destination_path=destination_path, reader=reader, reader_name=reader_name, parser=parser, parser_name=parser_name, writer=writer, writer_name=writer_name, settings=settings, settings_spec=settings_spec, settings_overrides=settings_overrides, config_section=config_section, enable_exit_status=enable_exit_status) return publisher.writer.parts def publish_doctree(source, source_path=None, source_class=io.StringInput, reader=None, reader_name='standalone', parser=None, parser_name='restructuredtext', settings=None, settings_spec=None, settings_overrides=None, config_section=None, enable_exit_status=False): """ Set up & run a `Publisher` for programmatic use. Return a document tree. Parameters: see `publish_programmatically()`. """ _output, publisher = publish_programmatically( source=source, source_path=source_path, source_class=source_class, destination=None, destination_path=None, destination_class=io.NullOutput, reader=reader, reader_name=reader_name, parser=parser, parser_name=parser_name, writer=None, writer_name='null', settings=settings, settings_spec=settings_spec, settings_overrides=settings_overrides, config_section=config_section, enable_exit_status=enable_exit_status) return publisher.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 output (`bytes` or `str`, cf. `publish_string()`). 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. Parameters: `document` is a `docutils.nodes.document` object, an existing document tree. Other parameters: see `publish_programmatically()`. This function is provisional because in Python 3 name and behaviour of the `io.StringOutput` class no longer match. """ reader = doctree.Reader(parser_name='null') publisher = Publisher(reader, None, writer, source=io.DocTreeInput(document), destination_class=io.StringOutput, settings=settings) if not writer and writer_name: publisher.set_writer(writer_name) publisher.process_programmatic_settings( settings_spec, settings_overrides, config_section) publisher.set_destination(None, destination_path) return publisher.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). Also return the output as `bytes`. 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). """ publisher = Publisher(reader, parser, writer, settings=settings, destination_class=destination_class) publisher.set_components(reader_name, parser_name, writer_name) output = publisher.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 output (as `str` or `bytes`, depending on `destination_class`, writer, and the "output_encoding" setting) 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 <https://docutils.sourceforge.io/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 as either a `bytes` object (ensure the 'input_encoding' setting matches its encoding) or a `str` object. * `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 name of the 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? """ publisher = Publisher(reader, parser, writer, settings=settings, source_class=source_class, destination_class=destination_class) publisher.set_components(reader_name, parser_name, writer_name) publisher.process_programmatic_settings( settings_spec, settings_overrides, config_section) publisher.set_source(source, source_path) publisher.set_destination(destination, destination_path) output = publisher.publish(enable_exit_status=enable_exit_status) return output, publisher # "Entry points" with functionality of the "tools/rst2*.py" scripts # cf. https://packaging.python.org/en/latest/specifications/entry-points/ def rst2something(writer, documenttype, doc_path=''): # Helper function for the common parts of rst2... # writer: writer name # documenttype: output document type # doc_path: documentation path (relative to the documentation root) description = ( f'Generate {documenttype} documents ' 'from standalone reStructuredText sources ' f'<https://docutils.sourceforge.io/docs/{doc_path}>. ' + default_description) locale.setlocale(locale.LC_ALL, '') publish_cmdline(writer_name=writer, description=description) def rst2html(): rst2something('html', 'HTML', 'user/html.html#html') def rst2html4(): rst2something('html4', 'XHTML 1.1', 'user/html.html#html4css1') def rst2html5(): rst2something('html5', 'HTML5', 'user/html.html#html5-polyglot') def rst2latex(): rst2something('latex', 'LaTeX', 'user/latex.html') def rst2man(): rst2something('manpage', 'Unix manual (troff)', 'user/manpage.html') def rst2odt(): rst2something('odt', 'OpenDocument text (ODT)', 'user/odt.html') def rst2pseudoxml(): rst2something('pseudoxml', 'pseudo-XML (test)', 'ref/doctree.html') def rst2s5(): rst2something('s5', 'S5 HTML slideshow', 'user/slide-shows.html') def rst2xetex(): rst2something('xetex', 'LaTeX (XeLaTeX/LuaLaTeX)', 'user/latex.html') def rst2xml(): rst2something('xml', 'Docutils-native XML', 'ref/doctree.html')