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# $Id: __init__.py 9649 2024-04-23 18:54:26Z grubert $
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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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This is the Docutils (Python Documentation Utilities) package.
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Package Structure
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=================
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Modules:
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- __init__.py: Contains component base classes, exception classes, and
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Docutils version information.
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- core.py: Contains the ``Publisher`` class and ``publish_*()`` convenience
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functions.
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- frontend.py: Runtime settings (command-line interface, configuration files)
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processing, for Docutils front-ends.
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- io.py: Provides a uniform API for low-level input and output.
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- nodes.py: Docutils document tree (doctree) node class library.
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- statemachine.py: A finite state machine specialized for
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regular-expression-based text filters.
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Subpackages:
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- languages: Language-specific mappings of terms.
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- parsers: Syntax-specific input parser modules or packages.
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- readers: Context-specific input handlers which understand the data
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source and manage a parser.
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- transforms: Modules used by readers and writers to modify
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the Docutils document tree.
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- utils: Contains the ``Reporter`` system warning class and miscellaneous
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utilities used by readers, writers, and transforms.
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utils/urischemes.py: Contains a complete mapping of known URI addressing
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scheme names to descriptions.
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- utils/math: Contains functions for conversion of mathematical notation
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between different formats (LaTeX, MathML, text, ...).
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- writers: Format-specific output translators.
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"""
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from collections import namedtuple
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__docformat__ = 'reStructuredText'
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__version__ = '0.21.2'
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"""Docutils version identifier (complies with PEP 440)::
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major.minor[.micro][releaselevel[serial]][.dev]
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For version comparison operations, use `__version_info__` (see, below)
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rather than parsing the text of `__version__`.
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https://docutils.sourceforge.io/docs/dev/policies.html#version-identification
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"""
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__version_details__ = ''
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"""Optional extra version details (e.g. 'snapshot 2005-05-29, r3410').
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For development and release status, use `__version__ and `__version_info__`.
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"""
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class VersionInfo(namedtuple('VersionInfo',
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'major minor micro releaselevel serial release')):
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def __new__(cls, major=0, minor=0, micro=0,
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releaselevel='final', serial=0, release=True):
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releaselevels = ('alpha', 'beta', 'candidate', 'final')
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if releaselevel not in releaselevels:
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raise ValueError('releaselevel must be one of %r.'
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% (releaselevels, ))
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if releaselevel == 'final':
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if not release:
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raise ValueError('releaselevel "final" must not be used '
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'with development versions (leads to wrong '
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'version ordering of the related __version__')
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# cf. https://peps.python.org/pep-0440/#summary-of-permitted-suffixes-and-relative-ordering # noqa
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if serial != 0:
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raise ValueError('"serial" must be 0 for final releases')
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return super().__new__(cls, major, minor, micro,
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releaselevel, serial, release)
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def __lt__(self, other):
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if isinstance(other, tuple):
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other = VersionInfo(*other)
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return tuple.__lt__(self, other)
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def __gt__(self, other):
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if isinstance(other, tuple):
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other = VersionInfo(*other)
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return tuple.__gt__(self, other)
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def __le__(self, other):
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if isinstance(other, tuple):
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other = VersionInfo(*other)
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return tuple.__le__(self, other)
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def __ge__(self, other):
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if isinstance(other, tuple):
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other = VersionInfo(*other)
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return tuple.__ge__(self, other)
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__version_info__ = VersionInfo(
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major=0,
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minor=21,
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micro=2,
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releaselevel='final', # one of 'alpha', 'beta', 'candidate', 'final'
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serial=0, # pre-release number (0 for final releases and snapshots)
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release=True # True for official releases and pre-releases
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)
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"""Comprehensive version information tuple.
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https://docutils.sourceforge.io/docs/dev/policies.html#version-identification
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"""
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class ApplicationError(Exception): pass
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class DataError(ApplicationError): pass
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class SettingsSpec:
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"""
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Runtime setting specification base class.
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SettingsSpec subclass objects used by `docutils.frontend.OptionParser`.
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"""
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# TODO: replace settings_specs with a new data structure
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# Backwards compatiblity:
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# Drop-in components:
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# Sphinx supplies settings_spec in the current format in some places
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# Myst parser provides a settings_spec tuple
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#
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# Sphinx reads a settings_spec in order to set a default value
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# in writers/html.py:59
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# https://github.com/sphinx-doc/sphinx/blob/4.x/sphinx/writers/html.py
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# This should be changed (before retiring the old format)
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# to use `settings_default_overrides` instead.
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settings_spec = ()
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"""Runtime settings specification. Override in subclasses.
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Defines runtime settings and associated command-line options, as used by
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`docutils.frontend.OptionParser`. This is a tuple of:
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- Option group title (string or `None` which implies no group, just a list
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of single options).
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- Description (string or `None`).
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- A sequence of option tuples. Each consists of:
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- Help text (string)
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- List of option strings (e.g. ``['-Q', '--quux']``).
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- Dictionary of keyword arguments sent to the OptionParser/OptionGroup
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``add_option`` method.
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Runtime setting names are derived implicitly from long option names
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('--a-setting' becomes ``settings.a_setting``) or explicitly from the
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'dest' keyword argument.
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Most settings will also have a 'validator' keyword & function. The
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validator function validates setting values (from configuration files
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and command-line option arguments) and converts them to appropriate
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types. For example, the ``docutils.frontend.validate_boolean``
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function, **required by all boolean settings**, converts true values
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('1', 'on', 'yes', and 'true') to 1 and false values ('0', 'off',
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'no', 'false', and '') to 0. Validators need only be set once per
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setting. See the `docutils.frontend.validate_*` functions.
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See the optparse docs for more details.
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- More triples of group title, description, options, as many times as
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needed. Thus, `settings_spec` tuples can be simply concatenated.
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"""
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settings_defaults = None
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"""A dictionary of defaults for settings not in `settings_spec` (internal
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settings, intended to be inaccessible by command-line and config file).
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Override in subclasses."""
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settings_default_overrides = None
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"""A dictionary of auxiliary defaults, to override defaults for settings
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defined in other components' `setting_specs`. Override in subclasses."""
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relative_path_settings = ()
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"""Settings containing filesystem paths. Override in subclasses.
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Settings listed here are to be interpreted relative to the current working
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directory."""
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config_section = None
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"""The name of the config file section specific to this component
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(lowercase, no brackets). Override in subclasses."""
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config_section_dependencies = None
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"""A list of names of config file sections that are to be applied before
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`config_section`, in order (from general to specific). In other words,
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the settings in `config_section` are to be overlaid on top of the settings
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from these sections. The "general" section is assumed implicitly.
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Override in subclasses."""
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class TransformSpec:
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"""
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Runtime transform specification base class.
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Provides the interface to register "transforms" and helper functions
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to resolve references with a `docutils.transforms.Transformer`.
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https://docutils.sourceforge.io/docs/ref/transforms.html
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"""
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def get_transforms(self):
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"""Transforms required by this class. Override in subclasses."""
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if self.default_transforms != ():
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import warnings
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warnings.warn('TransformSpec: the "default_transforms" attribute '
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'will be removed in Docutils 2.0.\n'
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'Use get_transforms() method instead.',
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DeprecationWarning)
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return list(self.default_transforms)
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return []
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# Deprecated; for compatibility.
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default_transforms = ()
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unknown_reference_resolvers = ()
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"""List of functions to try to resolve unknown references.
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Unknown references have a 'refname' attribute which doesn't correspond
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to any target in the document. Called when the transforms in
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`docutils.transforms.references` are unable to find a correct target.
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The list should contain functions which will try to resolve unknown
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references, with the following signature::
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def reference_resolver(node):
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'''Returns boolean: true if resolved, false if not.'''
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If the function is able to resolve the reference, it should also remove
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the 'refname' attribute and mark the node as resolved::
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del node['refname']
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node.resolved = 1
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Each function must have a "priority" attribute which will affect the order
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the unknown_reference_resolvers are run::
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reference_resolver.priority = 100
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This hook is provided for 3rd party extensions.
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Example use case: the `MoinMoin - ReStructured Text Parser`
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in ``sandbox/mmgilbe/rst.py``.
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"""
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class Component(SettingsSpec, TransformSpec):
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"""Base class for Docutils components."""
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component_type = None
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"""Name of the component type ('reader', 'parser', 'writer'). Override in
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subclasses."""
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supported = ()
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"""Name and aliases for this component. Override in subclasses."""
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def supports(self, format):
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"""
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Is `format` supported by this component?
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To be used by transforms to ask the dependent component if it supports
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a certain input context or output format.
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"""
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return format in self.supported
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