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# $Id: frontend.py 9328 2023-02-07 14:24:37Z milde $
# Author: David Goodger <goodger@python.org>
# Copyright: This module has been placed in the public domain.
"""
Command-line and common processing for Docutils front-end tools.
This module is provisional.
Major changes will happen with the switch from the deprecated
"optparse" module to "arparse".
Applications should use the high-level API provided by `docutils.core`.
See https://docutils.sourceforge.io/docs/api/runtime-settings.html.
Exports the following classes:
* `OptionParser`: Standard Docutils command-line processing.
Deprecated. Will be replaced by an ArgumentParser.
* `Option`: Customized version of `optparse.Option`; validation support.
Deprecated. Will be removed.
* `Values`: Runtime settings; objects are simple structs
(``object.attribute``). Supports cumulative list settings (attributes).
Deprecated. Will be removed.
* `ConfigParser`: Standard Docutils config file processing.
Provisional. Details will change.
Also exports the following functions:
Interface function:
`get_default_settings()`. New in 0.19.
Option callbacks:
`store_multiple()`, `read_config_file()`. Deprecated.
Setting validators:
`validate_encoding()`, `validate_encoding_error_handler()`,
`validate_encoding_and_error_handler()`,
`validate_boolean()`, `validate_ternary()`,
`validate_nonnegative_int()`, `validate_threshold()`,
`validate_colon_separated_string_list()`,
`validate_comma_separated_list()`,
`validate_url_trailing_slash()`,
`validate_dependency_file()`,
`validate_strip_class()`
`validate_smartquotes_locales()`.
Provisional.
Misc:
`make_paths_absolute()`, `filter_settings_spec()`. Provisional.
"""
__docformat__ = 'reStructuredText'
import codecs
import configparser
import optparse
from optparse import SUPPRESS_HELP
import os
import os.path
import sys
import warnings
import docutils
from docutils import io, utils
def store_multiple(option, opt, value, parser, *args, **kwargs):
"""
Store multiple values in `parser.values`. (Option callback.)
Store `None` for each attribute named in `args`, and store the value for
each key (attribute name) in `kwargs`.
"""
for attribute in args:
setattr(parser.values, attribute, None)
for key, value in kwargs.items():
setattr(parser.values, key, value)
def read_config_file(option, opt, value, parser):
"""
Read a configuration file during option processing. (Option callback.)
"""
try:
new_settings = parser.get_config_file_settings(value)
except ValueError as err:
parser.error(err)
parser.values.update(new_settings, parser)
def validate_encoding(setting, value, option_parser,
config_parser=None, config_section=None):
if value == '':
return None # allow overwriting a config file value
try:
codecs.lookup(value)
except LookupError:
raise LookupError('setting "%s": unknown encoding: "%s"'
% (setting, value))
return value
def validate_encoding_error_handler(setting, value, option_parser,
config_parser=None, config_section=None):
try:
codecs.lookup_error(value)
except LookupError:
raise LookupError(
'unknown encoding error handler: "%s" (choices: '
'"strict", "ignore", "replace", "backslashreplace", '
'"xmlcharrefreplace", and possibly others; see documentation for '
'the Python ``codecs`` module)' % value)
return value
def validate_encoding_and_error_handler(
setting, value, option_parser, config_parser=None, config_section=None):
"""
Side-effect: if an error handler is included in the value, it is inserted
into the appropriate place as if it was a separate setting/option.
"""
if ':' in value:
encoding, handler = value.split(':')
validate_encoding_error_handler(
setting + '_error_handler', handler, option_parser,
config_parser, config_section)
if config_parser:
config_parser.set(config_section, setting + '_error_handler',
handler)
else:
setattr(option_parser.values, setting + '_error_handler', handler)
else:
encoding = value
validate_encoding(setting, encoding, option_parser,
config_parser, config_section)
return encoding
def validate_boolean(setting, value, option_parser,
config_parser=None, config_section=None):
"""Check/normalize boolean settings:
True: '1', 'on', 'yes', 'true'
False: '0', 'off', 'no','false', ''
"""
if isinstance(value, bool):
return value
try:
return option_parser.booleans[value.strip().lower()]
except KeyError:
raise LookupError('unknown boolean value: "%s"' % value)
def validate_ternary(setting, value, option_parser,
config_parser=None, config_section=None):
"""Check/normalize three-value settings:
True: '1', 'on', 'yes', 'true'
False: '0', 'off', 'no','false', ''
any other value: returned as-is.
"""
if isinstance(value, bool) or value is None:
return value
try:
return option_parser.booleans[value.strip().lower()]
except KeyError:
return value
def validate_nonnegative_int(setting, value, option_parser,
config_parser=None, config_section=None):
value = int(value)
if value < 0:
raise ValueError('negative value; must be positive or zero')
return value
def validate_threshold(setting, value, option_parser,
config_parser=None, config_section=None):
try:
return int(value)
except ValueError:
try:
return option_parser.thresholds[value.lower()]
except (KeyError, AttributeError):
raise LookupError('unknown threshold: %r.' % value)
def validate_colon_separated_string_list(
setting, value, option_parser, config_parser=None, config_section=None):
if not isinstance(value, list):
value = value.split(':')
else:
last = value.pop()
value.extend(last.split(':'))
return value
def validate_comma_separated_list(setting, value, option_parser,
config_parser=None, config_section=None):
"""Check/normalize list arguments (split at "," and strip whitespace).
"""
# `value` may be ``bytes``, ``str``, or a ``list`` (when given as
# command line option and "action" is "append").
if not isinstance(value, list):
value = [value]
# this function is called for every option added to `value`
# -> split the last item and append the result:
last = value.pop()
items = [i.strip(' \t\n') for i in last.split(',') if i.strip(' \t\n')]
value.extend(items)
return value
def validate_url_trailing_slash(
setting, value, option_parser, config_parser=None, config_section=None):
if not value:
return './'
elif value.endswith('/'):
return value
else:
return value + '/'
def validate_dependency_file(setting, value, option_parser,
config_parser=None, config_section=None):
try:
return utils.DependencyList(value)
except OSError:
# TODO: warn/info?
return utils.DependencyList(None)
def validate_strip_class(setting, value, option_parser,
config_parser=None, config_section=None):
# value is a comma separated string list:
value = validate_comma_separated_list(setting, value, option_parser,
config_parser, config_section)
# validate list elements:
for cls in value:
normalized = docutils.nodes.make_id(cls)
if cls != normalized:
raise ValueError('Invalid class value %r (perhaps %r?)'
% (cls, normalized))
return value
def validate_smartquotes_locales(setting, value, option_parser,
config_parser=None, config_section=None):
"""Check/normalize a comma separated list of smart quote definitions.
Return a list of (language-tag, quotes) string tuples."""
# value is a comma separated string list:
value = validate_comma_separated_list(setting, value, option_parser,
config_parser, config_section)
# validate list elements
lc_quotes = []
for item in value:
try:
lang, quotes = item.split(':', 1)
except AttributeError:
# this function is called for every option added to `value`
# -> ignore if already a tuple:
lc_quotes.append(item)
continue
except ValueError:
raise ValueError('Invalid value "%s".'
' Format is "<language>:<quotes>".'
% item.encode('ascii', 'backslashreplace'))
# parse colon separated string list:
quotes = quotes.strip()
multichar_quotes = quotes.split(':')
if len(multichar_quotes) == 4:
quotes = multichar_quotes
elif len(quotes) != 4:
raise ValueError('Invalid value "%s". Please specify 4 quotes\n'
' (primary open/close; secondary open/close).'
% item.encode('ascii', 'backslashreplace'))
lc_quotes.append((lang, quotes))
return lc_quotes
def make_paths_absolute(pathdict, keys, base_path=None):
"""
Interpret filesystem path settings relative to the `base_path` given.
Paths are values in `pathdict` whose keys are in `keys`. Get `keys` from
`OptionParser.relative_path_settings`.
"""
if base_path is None:
base_path = os.getcwd()
for key in keys:
if key in pathdict:
value = pathdict[key]
if isinstance(value, list):
value = [make_one_path_absolute(base_path, path)
for path in value]
elif value:
value = make_one_path_absolute(base_path, value)
pathdict[key] = value
def make_one_path_absolute(base_path, path):
return os.path.abspath(os.path.join(base_path, path))
def filter_settings_spec(settings_spec, *exclude, **replace):
"""Return a copy of `settings_spec` excluding/replacing some settings.
`settings_spec` is a tuple of configuration settings
(cf. `docutils.SettingsSpec.settings_spec`).
Optional positional arguments are names of to-be-excluded settings.
Keyword arguments are option specification replacements.
(See the html4strict writer for an example.)
"""
settings = list(settings_spec)
# every third item is a sequence of option tuples
for i in range(2, len(settings), 3):
newopts = []
for opt_spec in settings[i]:
# opt_spec is ("<help>", [<option strings>], {<keyword args>})
opt_name = [opt_string[2:].replace('-', '_')
for opt_string in opt_spec[1]
if opt_string.startswith('--')][0]
if opt_name in exclude:
continue
if opt_name in replace.keys():
newopts.append(replace[opt_name])
else:
newopts.append(opt_spec)
settings[i] = tuple(newopts)
return tuple(settings)
class Values(optparse.Values):
"""Storage for option values.
Updates list attributes by extension rather than by replacement.
Works in conjunction with the `OptionParser.lists` instance attribute.
Deprecated. Will be removed.
"""
def __init__(self, *args, **kwargs):
warnings.warn('frontend.Values class will be removed '
'in Docutils 0.21 or later.',
DeprecationWarning, stacklevel=2)
super().__init__(*args, **kwargs)
if getattr(self, 'record_dependencies', None) is None:
# Set up dummy dependency list.
self.record_dependencies = utils.DependencyList()
def update(self, other_dict, option_parser):
if isinstance(other_dict, Values):
other_dict = other_dict.__dict__
other_dict = dict(other_dict) # also works with ConfigParser sections
for setting in option_parser.lists.keys():
if hasattr(self, setting) and setting in other_dict:
value = getattr(self, setting)
if value:
value += other_dict[setting]
del other_dict[setting]
self._update_loose(other_dict)
def copy(self):
"""Return a shallow copy of `self`."""
with warnings.catch_warnings():
warnings.filterwarnings('ignore', category=DeprecationWarning)
return self.__class__(defaults=self.__dict__)
def setdefault(self, name, default):
"""Return ``self.name`` or ``default``.
If ``self.name`` is unset, set ``self.name = default``.
"""
if getattr(self, name, None) is None:
setattr(self, name, default)
return getattr(self, name)
class Option(optparse.Option):
"""Add validation and override support to `optparse.Option`.
Deprecated. Will be removed.
"""
ATTRS = optparse.Option.ATTRS + ['validator', 'overrides']
def __init__(self, *args, **kwargs):
warnings.warn('The frontend.Option class will be removed '
'in Docutils 0.21 or later.',
DeprecationWarning, stacklevel=2)
super().__init__(*args, **kwargs)
def process(self, opt, value, values, parser):
"""
Call the validator function on applicable settings and
evaluate the 'overrides' option.
Extends `optparse.Option.process`.
"""
result = super().process(opt, value, values, parser)
setting = self.dest
if setting:
if self.validator:
value = getattr(values, setting)
try:
new_value = self.validator(setting, value, parser)
except Exception as err:
raise optparse.OptionValueError(
'Error in option "%s":\n %s'
% (opt, io.error_string(err)))
setattr(values, setting, new_value)
if self.overrides:
setattr(values, self.overrides, None)
return result
class OptionParser(optparse.OptionParser, docutils.SettingsSpec):
"""
Settings parser for command-line and library use.
The `settings_spec` specification here and in other Docutils components
are merged to build the set of command-line options and runtime settings
for this process.
Common settings (defined below) and component-specific settings must not
conflict. Short options are reserved for common settings, and components
are restricted to using long options.
Deprecated.
Will be replaced by a subclass of `argparse.ArgumentParser`.
"""
standard_config_files = [
'/etc/docutils.conf', # system-wide
'./docutils.conf', # project-specific
'~/.docutils'] # user-specific
"""Docutils configuration files, using ConfigParser syntax.
Filenames will be tilde-expanded later. Later files override earlier ones.
"""
threshold_choices = 'info 1 warning 2 error 3 severe 4 none 5'.split()
"""Possible inputs for for --report and --halt threshold values."""
thresholds = {'info': 1, 'warning': 2, 'error': 3, 'severe': 4, 'none': 5}
"""Lookup table for --report and --halt threshold values."""
booleans = {'1': True, 'on': True, 'yes': True, 'true': True, '0': False,
'off': False, 'no': False, 'false': False, '': False}
"""Lookup table for boolean configuration file settings."""
default_error_encoding = (getattr(sys.stderr, 'encoding', None)
or io._locale_encoding # noqa
or 'ascii')
default_error_encoding_error_handler = 'backslashreplace'
settings_spec = (
'General Docutils Options',
None,
(('Output destination name. Obsoletes the <destination> '
'positional argument. Default: None (stdout).',
['--output'], {'metavar': '<destination>'}),
('Specify the document title as metadata.',
['--title'], {'metavar': '<title>'}),
('Include a "Generated by Docutils" credit and link.',
['--generator', '-g'], {'action': 'store_true',
'validator': validate_boolean}),
('Do not include a generator credit.',
['--no-generator'], {'action': 'store_false', 'dest': 'generator'}),
('Include the date at the end of the document (UTC).',
['--date', '-d'], {'action': 'store_const', 'const': '%Y-%m-%d',
'dest': 'datestamp'}),
('Include the time & date (UTC).',
['--time', '-t'], {'action': 'store_const',
'const': '%Y-%m-%d %H:%M UTC',
'dest': 'datestamp'}),
('Do not include a datestamp of any kind.',
['--no-datestamp'], {'action': 'store_const', 'const': None,
'dest': 'datestamp'}),
('Include a "View document source" link.',
['--source-link', '-s'], {'action': 'store_true',
'validator': validate_boolean}),
('Use <URL> for a source link; implies --source-link.',
['--source-url'], {'metavar': '<URL>'}),
('Do not include a "View document source" link.',
['--no-source-link'],
{'action': 'callback', 'callback': store_multiple,
'callback_args': ('source_link', 'source_url')}),
('Link from section headers to TOC entries. (default)',
['--toc-entry-backlinks'],
{'dest': 'toc_backlinks', 'action': 'store_const', 'const': 'entry',
'default': 'entry'}),
('Link from section headers to the top of the TOC.',
['--toc-top-backlinks'],
{'dest': 'toc_backlinks', 'action': 'store_const', 'const': 'top'}),
('Disable backlinks to the table of contents.',
['--no-toc-backlinks'],
{'dest': 'toc_backlinks', 'action': 'store_false'}),
('Link from footnotes/citations to references. (default)',
['--footnote-backlinks'],
{'action': 'store_true', 'default': 1,
'validator': validate_boolean}),
('Disable backlinks from footnotes and citations.',
['--no-footnote-backlinks'],
{'dest': 'footnote_backlinks', 'action': 'store_false'}),
('Enable section numbering by Docutils. (default)',
['--section-numbering'],
{'action': 'store_true', 'dest': 'sectnum_xform',
'default': 1, 'validator': validate_boolean}),
('Disable section numbering by Docutils.',
['--no-section-numbering'],
{'action': 'store_false', 'dest': 'sectnum_xform'}),
('Remove comment elements from the document tree.',
['--strip-comments'],
{'action': 'store_true', 'validator': validate_boolean}),
('Leave comment elements in the document tree. (default)',
['--leave-comments'],
{'action': 'store_false', 'dest': 'strip_comments'}),
('Remove all elements with classes="<class>" from the document tree. '
'Warning: potentially dangerous; use with caution. '
'(Multiple-use option.)',
['--strip-elements-with-class'],
{'action': 'append', 'dest': 'strip_elements_with_classes',
'metavar': '<class>', 'validator': validate_strip_class}),
('Remove all classes="<class>" attributes from elements in the '
'document tree. Warning: potentially dangerous; use with caution. '
'(Multiple-use option.)',
['--strip-class'],
{'action': 'append', 'dest': 'strip_classes',
'metavar': '<class>', 'validator': validate_strip_class}),
('Report system messages at or higher than <level>: "info" or "1", '
'"warning"/"2" (default), "error"/"3", "severe"/"4", "none"/"5"',
['--report', '-r'], {'choices': threshold_choices, 'default': 2,
'dest': 'report_level', 'metavar': '<level>',
'validator': validate_threshold}),
('Report all system messages. (Same as "--report=1".)',
['--verbose', '-v'], {'action': 'store_const', 'const': 1,
'dest': 'report_level'}),
('Report no system messages. (Same as "--report=5".)',
['--quiet', '-q'], {'action': 'store_const', 'const': 5,
'dest': 'report_level'}),
('Halt execution at system messages at or above <level>. '
'Levels as in --report. Default: 4 (severe).',
['--halt'], {'choices': threshold_choices, 'dest': 'halt_level',
'default': 4, 'metavar': '<level>',
'validator': validate_threshold}),
('Halt at the slightest problem. Same as "--halt=info".',
['--strict'], {'action': 'store_const', 'const': 1,
'dest': 'halt_level'}),
('Enable a non-zero exit status for non-halting system messages at '
'or above <level>. Default: 5 (disabled).',
['--exit-status'], {'choices': threshold_choices,
'dest': 'exit_status_level',
'default': 5, 'metavar': '<level>',
'validator': validate_threshold}),
('Enable debug-level system messages and diagnostics.',
['--debug'], {'action': 'store_true',
'validator': validate_boolean}),
('Disable debug output. (default)',
['--no-debug'], {'action': 'store_false', 'dest': 'debug'}),
('Send the output of system messages to <file>.',
['--warnings'], {'dest': 'warning_stream', 'metavar': '<file>'}),
('Enable Python tracebacks when Docutils is halted.',
['--traceback'], {'action': 'store_true', 'default': None,
'validator': validate_boolean}),
('Disable Python tracebacks. (default)',
['--no-traceback'], {'dest': 'traceback', 'action': 'store_false'}),
('Specify the encoding and optionally the '
'error handler of input text. Default: <auto-detect>:strict.',
['--input-encoding', '-i'],
{'metavar': '<name[:handler]>',
'validator': validate_encoding_and_error_handler}),
('Specify the error handler for undecodable characters. '
'Choices: "strict" (default), "ignore", and "replace".',
['--input-encoding-error-handler'],
{'default': 'strict', 'validator': validate_encoding_error_handler}),
('Specify the text encoding and optionally the error handler for '
'output. Default: utf-8:strict.',
['--output-encoding', '-o'],
{'metavar': '<name[:handler]>', 'default': 'utf-8',
'validator': validate_encoding_and_error_handler}),
('Specify error handler for unencodable output characters; '
'"strict" (default), "ignore", "replace", '
'"xmlcharrefreplace", "backslashreplace".',
['--output-encoding-error-handler'],
{'default': 'strict', 'validator': validate_encoding_error_handler}),
('Specify text encoding and optionally error handler '
'for error output. Default: %s:%s.'
% (default_error_encoding, default_error_encoding_error_handler),
['--error-encoding', '-e'],
{'metavar': '<name[:handler]>', 'default': default_error_encoding,
'validator': validate_encoding_and_error_handler}),
('Specify the error handler for unencodable characters in '
'error output. Default: %s.'
% default_error_encoding_error_handler,
['--error-encoding-error-handler'],
{'default': default_error_encoding_error_handler,
'validator': validate_encoding_error_handler}),
('Specify the language (as BCP 47 language tag). Default: en.',
['--language', '-l'], {'dest': 'language_code', 'default': 'en',
'metavar': '<name>'}),
('Write output file dependencies to <file>.',
['--record-dependencies'],
{'metavar': '<file>', 'validator': validate_dependency_file,
'default': None}), # default set in Values class
('Read configuration settings from <file>, if it exists.',
['--config'], {'metavar': '<file>', 'type': 'string',
'action': 'callback', 'callback': read_config_file}),
("Show this program's version number and exit.",
['--version', '-V'], {'action': 'version'}),
('Show this help message and exit.',
['--help', '-h'], {'action': 'help'}),
# Typically not useful for non-programmatical use:
(SUPPRESS_HELP, ['--id-prefix'], {'default': ''}),
(SUPPRESS_HELP, ['--auto-id-prefix'], {'default': '%'}),
# Hidden options, for development use only:
(SUPPRESS_HELP, ['--dump-settings'], {'action': 'store_true'}),
(SUPPRESS_HELP, ['--dump-internals'], {'action': 'store_true'}),
(SUPPRESS_HELP, ['--dump-transforms'], {'action': 'store_true'}),
(SUPPRESS_HELP, ['--dump-pseudo-xml'], {'action': 'store_true'}),
(SUPPRESS_HELP, ['--expose-internal-attribute'],
{'action': 'append', 'dest': 'expose_internals',
'validator': validate_colon_separated_string_list}),
(SUPPRESS_HELP, ['--strict-visitor'], {'action': 'store_true'}),
))
"""Runtime settings and command-line options common to all Docutils front
ends. Setting specs specific to individual Docutils components are also
used (see `populate_from_components()`)."""
settings_defaults = {'_disable_config': None,
'_source': None,
'_destination': None,
'_config_files': None}
"""Defaults for settings without command-line option equivalents.
See https://docutils.sourceforge.io/docs/user/config.html#internal-settings
"""
config_section = 'general'
version_template = ('%%prog (Docutils %s%s, Python %s, on %s)'
% (docutils.__version__,
docutils.__version_details__
and ' [%s]'%docutils.__version_details__ or '',
sys.version.split()[0], sys.platform))
"""Default version message."""
def __init__(self, components=(), defaults=None, read_config_files=False,
*args, **kwargs):
"""Set up OptionParser instance.
`components` is a list of Docutils components each containing a
``.settings_spec`` attribute.
`defaults` is a mapping of setting default overrides.
"""
self.lists = {}
"""Set of list-type settings."""
self.config_files = []
"""List of paths of applied configuration files."""
self.relative_path_settings = ['warning_stream'] # will be modified
warnings.warn('The frontend.OptionParser class will be replaced '
'by a subclass of argparse.ArgumentParser '
'in Docutils 0.21 or later.',
DeprecationWarning, stacklevel=2)
super().__init__(option_class=Option, add_help_option=None,
formatter=optparse.TitledHelpFormatter(width=78),
*args, **kwargs)
if not self.version:
self.version = self.version_template
self.components = (self, *components)
self.populate_from_components(self.components)
self.defaults.update(defaults or {})
if read_config_files and not self.defaults['_disable_config']:
try:
config_settings = self.get_standard_config_settings()
except ValueError as err:
self.error(err)
self.defaults.update(config_settings.__dict__)
def populate_from_components(self, components):
"""Collect settings specification from components.
For each component, populate from the `SettingsSpec.settings_spec`
structure, then from the `SettingsSpec.settings_defaults` dictionary.
After all components have been processed, check for and populate from
each component's `SettingsSpec.settings_default_overrides` dictionary.
"""
for component in components:
if component is None:
continue
settings_spec = component.settings_spec
self.relative_path_settings.extend(
component.relative_path_settings)
for i in range(0, len(settings_spec), 3):
title, description, option_spec = settings_spec[i:i+3]
if title:
group = optparse.OptionGroup(self, title, description)
self.add_option_group(group)
else:
group = self # single options
for (help_text, option_strings, kwargs) in option_spec:
option = group.add_option(help=help_text, *option_strings,
**kwargs)
if kwargs.get('action') == 'append':
self.lists[option.dest] = True
if component.settings_defaults:
self.defaults.update(component.settings_defaults)
for component in components:
if component and component.settings_default_overrides:
self.defaults.update(component.settings_default_overrides)
@classmethod
def get_standard_config_files(cls):
"""Return list of config files, from environment or standard."""
if 'DOCUTILSCONFIG' in os.environ:
config_files = os.environ['DOCUTILSCONFIG'].split(os.pathsep)
else:
config_files = cls.standard_config_files
return [os.path.expanduser(f) for f in config_files if f.strip()]
def get_standard_config_settings(self):
with warnings.catch_warnings():
warnings.filterwarnings('ignore', category=DeprecationWarning)
settings = Values()
for filename in self.get_standard_config_files():
settings.update(self.get_config_file_settings(filename), self)
return settings
def get_config_file_settings(self, config_file):
"""Returns a dictionary containing appropriate config file settings."""
config_parser = ConfigParser()
# parse config file, add filename if found and successfully read.
applied = set()
with warnings.catch_warnings():
warnings.filterwarnings('ignore', category=DeprecationWarning)
self.config_files += config_parser.read(config_file, self)
settings = Values()
for component in self.components:
if not component:
continue
for section in (tuple(component.config_section_dependencies or ())
+ (component.config_section,)):
if section in applied:
continue
applied.add(section)
if config_parser.has_section(section):
settings.update(config_parser[section], self)
make_paths_absolute(settings.__dict__,
self.relative_path_settings,
os.path.dirname(config_file))
return settings.__dict__
def check_values(self, values, args):
"""Store positional arguments as runtime settings."""
values._source, values._destination = self.check_args(args)
make_paths_absolute(values.__dict__, self.relative_path_settings)
values._config_files = self.config_files
return values
def check_args(self, args):
source = destination = None
if args:
source = args.pop(0)
if source == '-': # means stdin
source = None
if args:
destination = args.pop(0)
if destination == '-': # means stdout
destination = None
if args:
self.error('Maximum 2 arguments allowed.')
if source and source == destination:
self.error('Do not specify the same file for both source and '
'destination. It will clobber the source file.')
return source, destination
def set_defaults_from_dict(self, defaults):
# not used, deprecated, will be removed
self.defaults.update(defaults)
def get_default_values(self):
"""Needed to get custom `Values` instances."""
with warnings.catch_warnings():
warnings.filterwarnings('ignore', category=DeprecationWarning)
defaults = Values(self.defaults)
defaults._config_files = self.config_files
return defaults
def get_option_by_dest(self, dest):
"""
Get an option by its dest.
If you're supplying a dest which is shared by several options,
it is undefined which option of those is returned.
A KeyError is raised if there is no option with the supplied
dest.
"""
for group in self.option_groups + [self]:
for option in group.option_list:
if option.dest == dest:
return option
raise KeyError('No option with dest == %r.' % dest)
class ConfigParser(configparser.RawConfigParser):
"""Parser for Docutils configuration files.
See https://docutils.sourceforge.io/docs/user/config.html.
Option key normalization includes conversion of '-' to '_'.
Config file encoding is "utf-8". Encoding errors are reported
and the affected file(s) skipped.
This class is provisional and will change in future versions.
"""
old_settings = {
'pep_stylesheet': ('pep_html writer', 'stylesheet'),
'pep_stylesheet_path': ('pep_html writer', 'stylesheet_path'),
'pep_template': ('pep_html writer', 'template')}
"""{old setting: (new section, new setting)} mapping, used by
`handle_old_config`, to convert settings from the old [options] section.
"""
old_warning = (
'The "[option]" section is deprecated.\n'
'Support for old-format configuration files will be removed in '
'Docutils 0.21 or later. Please revise your configuration files. '
'See <https://docutils.sourceforge.io/docs/user/config.html>, '
'section "Old-Format Configuration Files".')
not_utf8_error = """\
Unable to read configuration file "%s": content not encoded as UTF-8.
Skipping "%s" configuration file.
"""
def read(self, filenames, option_parser=None):
# Currently, if a `docutils.frontend.OptionParser` instance is
# supplied, setting values are validated.
if option_parser is not None:
warnings.warn('frontend.ConfigParser.read(): parameter '
'"option_parser" will be removed '
'in Docutils 0.21 or later.',
DeprecationWarning, stacklevel=2)
read_ok = []
if isinstance(filenames, str):
filenames = [filenames]
for filename in filenames:
# Config files are UTF-8-encoded:
try:
read_ok += super().read(filename, encoding='utf-8')
except UnicodeDecodeError:
sys.stderr.write(self.not_utf8_error % (filename, filename))
continue
if 'options' in self:
self.handle_old_config(filename)
if option_parser is not None:
self.validate_settings(filename, option_parser)
return read_ok
def handle_old_config(self, filename):
warnings.warn_explicit(self.old_warning, ConfigDeprecationWarning,
filename, 0)
options = self.get_section('options')
if not self.has_section('general'):
self.add_section('general')
for key, value in options.items():
if key in self.old_settings:
section, setting = self.old_settings[key]
if not self.has_section(section):
self.add_section(section)
else:
section = 'general'
setting = key
if not self.has_option(section, setting):
self.set(section, setting, value)
self.remove_section('options')
def validate_settings(self, filename, option_parser):
"""
Call the validator function and implement overrides on all applicable
settings.
"""
for section in self.sections():
for setting in self.options(section):
try:
option = option_parser.get_option_by_dest(setting)
except KeyError:
continue
if option.validator:
value = self.get(section, setting)
try:
new_value = option.validator(
setting, value, option_parser,
config_parser=self, config_section=section)
except Exception as err:
raise ValueError(f'Error in config file "{filename}", '
f'section "[{section}]":\n'
f' {io.error_string(err)}\n'
f' {setting} = {value}')
self.set(section, setting, new_value)
if option.overrides:
self.set(section, option.overrides, None)
def optionxform(self, optionstr):
"""
Lowercase and transform '-' to '_'.
So the cmdline form of option names can be used in config files.
"""
return optionstr.lower().replace('-', '_')
def get_section(self, section):
"""
Return a given section as a dictionary.
Return empty dictionary if the section doesn't exist.
Deprecated. Use the configparser "Mapping Protocol Access" and
catch KeyError.
"""
warnings.warn('frontend.OptionParser.get_section() '
'will be removed in Docutils 0.21 or later.',
DeprecationWarning, stacklevel=2)
try:
return dict(self[section])
except KeyError:
return {}
class ConfigDeprecationWarning(FutureWarning):
"""Warning for deprecated configuration file features."""
def get_default_settings(*components):
"""Return default runtime settings for `components`.
Return a `frontend.Values` instance with defaults for generic Docutils
settings and settings from the `components` (`SettingsSpec` instances).
This corresponds to steps 1 and 2 in the `runtime settings priority`__.
__ https://docutils.sourceforge.io/docs/api/runtime-settings.html
#settings-priority
"""
with warnings.catch_warnings():
warnings.filterwarnings('ignore', category=DeprecationWarning)
return OptionParser(components).get_default_values()