cpython/Lib/configparser.py at main · https-github-com-nzysoft/cpython · GitHub

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"""Configuration file parser.

A configuration file consists of sections, lead by a "[section]" header,

and followed by "name: value" entries, with continuations and such in

the style of RFC 822.

Intrinsic defaults can be specified by passing them into the

ConfigParser constructor as a dictionary.

class:

ConfigParser -- responsible for parsing a list of

configuration files, and managing the parsed database.

methods:

__init__(defaults=None, dict_type=_default_dict, allow_no_value=False,

delimiters=('=', ':'), comment_prefixes=('#', ';'),

inline_comment_prefixes=None, strict=True,

empty_lines_in_values=True, default_section='DEFAULT',

interpolation=<unset>, converters=<unset>):

Create the parser. When `defaults` is given, it is initialized into the

dictionary or intrinsic defaults. The keys must be strings, the values

must be appropriate for %()s string interpolation.

When `dict_type` is given, it will be used to create the dictionary

objects for the list of sections, for the options within a section, and

for the default values.

When `delimiters` is given, it will be used as the set of substrings

that divide keys from values.

When `comment_prefixes` is given, it will be used as the set of

substrings that prefix comments in empty lines. Comments can be

indented.

When `inline_comment_prefixes` is given, it will be used as the set of

substrings that prefix comments in non-empty lines.

When `strict` is True, the parser won't allow for any section or option

duplicates while reading from a single source (file, string or

dictionary). Default is True.

When `empty_lines_in_values` is False (default: True), each empty line

marks the end of an option. Otherwise, internal empty lines of

a multiline option are kept as part of the value.

When `allow_no_value` is True (default: False), options without

values are accepted; the value presented for these is None.

When `default_section` is given, the name of the special section is

named accordingly. By default it is called ``"DEFAULT"`` but this can

be customized to point to any other valid section name. Its current

value can be retrieved using the ``parser_instance.default_section``

attribute and may be modified at runtime.

When `interpolation` is given, it should be an Interpolation subclass

instance. It will be used as the handler for option value

pre-processing when using getters. RawConfigParser objects don't do

any sort of interpolation, whereas ConfigParser uses an instance of

BasicInterpolation. The library also provides a ``zc.buildout``

inspired ExtendedInterpolation implementation.

When `converters` is given, it should be a dictionary where each key

represents the name of a type converter and each value is a callable

implementing the conversion from string to the desired datatype. Every

converter gets its corresponding get*() method on the parser object and

section proxies.

sections()

Return all the configuration section names, sans DEFAULT.

has_section(section)

Return whether the given section exists.

has_option(section, option)

Return whether the given option exists in the given section.

options(section)

Return list of configuration options for the named section.

read(filenames, encoding=None)

Read and parse the iterable of named configuration files, given by

name. A single filename is also allowed. Non-existing files

are ignored. Return list of successfully read files.

read_file(f, filename=None)

Read and parse one configuration file, given as a file object.

The filename defaults to f.name; it is only used in error

messages (if f has no `name` attribute, the string `<???>` is used).

read_string(string)

Read configuration from a given string.

read_dict(dictionary)

Read configuration from a dictionary. Keys are section names,

values are dictionaries with keys and values that should be present

in the section. If the used dictionary type preserves order, sections

and their keys will be added in order. Values are automatically

converted to strings.

get(section, option, raw=False, vars=None, fallback=_UNSET)

Return a string value for the named option. All % interpolations are

expanded in the return values, based on the defaults passed into the

constructor and the DEFAULT section. Additional substitutions may be

provided using the `vars` argument, which must be a dictionary whose

contents override any pre-existing defaults. If `option` is a key in

`vars`, the value from `vars` is used.

getint(section, options, raw=False, vars=None, fallback=_UNSET)

Like get(), but convert value to an integer.

getfloat(section, options, raw=False, vars=None, fallback=_UNSET)

Like get(), but convert value to a float.

getboolean(section, options, raw=False, vars=None, fallback=_UNSET)

Like get(), but convert value to a boolean (currently case

insensitively defined as 0, false, no, off for False, and 1, true,

yes, on for True). Returns False or True.

items(section=_UNSET, raw=False, vars=None)

If section is given, return a list of tuples with (name, value) for

each option in the section. Otherwise, return a list of tuples with

(section_name, section_proxy) for each section, including DEFAULTSECT.

remove_section(section)

Remove the given file section and all its options.

remove_option(section, option)

Remove the given option from the given section.

set(section, option, value)

Set the given option.

write(fp, space_around_delimiters=True)

Write the configuration state in .ini format. If

`space_around_delimiters` is True (the default), delimiters

between keys and values are surrounded by spaces.

"""

from collections.abc import MutableMapping

from collections import ChainMap as _ChainMap

import functools

import io

import itertools

import os

import re

import sys

__all__ = ("NoSectionError", "DuplicateOptionError", "DuplicateSectionError",

"NoOptionError", "InterpolationError", "InterpolationDepthError",

"InterpolationMissingOptionError", "InterpolationSyntaxError",

"ParsingError", "MissingSectionHeaderError",

"ConfigParser", "RawConfigParser",

"Interpolation", "BasicInterpolation", "ExtendedInterpolation",

"SectionProxy", "ConverterMapping",

"DEFAULTSECT", "MAX_INTERPOLATION_DEPTH")

_default_dict = dict

DEFAULTSECT = "DEFAULT"

MAX_INTERPOLATION_DEPTH = 10

# exception classes

class Error(Exception):

"""Base class for ConfigParser exceptions."""

def __init__(self, msg=''):

self.message = msg

Exception.__init__(self, msg)

def __repr__(self):

return self.message

__str__ = __repr__

class NoSectionError(Error):

"""Raised when no section matches a requested option."""

def __init__(self, section):

Error.__init__(self, 'No section: %r' % (section,))

self.section = section

self.args = (section, )

class DuplicateSectionError(Error):

"""Raised when a section is repeated in an input source.

Possible repetitions that raise this exception are: multiple creation

using the API or in strict parsers when a section is found more than once

in a single input file, string or dictionary.

"""

def __init__(self, section, source=None, lineno=None):

msg = [repr(section), " already exists"]

if source is not None:

message = ["While reading from ", repr(source)]

if lineno is not None:

message.append(" [line {0:2d}]".format(lineno))

message.append(": section ")

message.extend(msg)

msg = message

else:

msg.insert(0, "Section ")

Error.__init__(self, "".join(msg))

self.section = section

self.source = source

self.lineno = lineno

self.args = (section, source, lineno)

class DuplicateOptionError(Error):

"""Raised by strict parsers when an option is repeated in an input source.

Current implementation raises this exception only when an option is found

more than once in a single file, string or dictionary.

"""

def __init__(self, section, option, source=None, lineno=None):

msg = [repr(option), " in section ", repr(section),

" already exists"]

if source is not None:

message = ["While reading from ", repr(source)]

if lineno is not None:

message.append(" [line {0:2d}]".format(lineno))

message.append(": option ")

message.extend(msg)

msg = message

else:

msg.insert(0, "Option ")

Error.__init__(self, "".join(msg))

self.section = section

self.option = option

self.source = source

self.lineno = lineno

self.args = (section, option, source, lineno)

class NoOptionError(Error):

"""A requested option was not found."""

def __init__(self, option, section):

Error.__init__(self, "No option %r in section: %r" %

(option, section))

self.option = option

self.section = section

self.args = (option, section)

class InterpolationError(Error):

"""Base class for interpolation-related exceptions."""

def __init__(self, option, section, msg):

Error.__init__(self, msg)

self.option = option

self.section = section

self.args = (option, section, msg)

class InterpolationMissingOptionError(InterpolationError):

"""A string substitution required a setting which was not available."""

def __init__(self, option, section, rawval, reference):

msg = ("Bad value substitution: option {!r} in section {!r} contains "

"an interpolation key {!r} which is not a valid option name. "

"Raw value: {!r}".format(option, section, reference, rawval))

InterpolationError.__init__(self, option, section, msg)

self.reference = reference

self.args = (option, section, rawval, reference)

class InterpolationSyntaxError(InterpolationError):

"""Raised when the source text contains invalid syntax.

Current implementation raises this exception when the source text into

which substitutions are made does not conform to the required syntax.

"""

class InterpolationDepthError(InterpolationError):

"""Raised when substitutions are nested too deeply."""

def __init__(self, option, section, rawval):

msg = ("Recursion limit exceeded in value substitution: option {!r} "

"in section {!r} contains an interpolation key which "

"cannot be substituted in {} steps. Raw value: {!r}"

"".format(option, section, MAX_INTERPOLATION_DEPTH,

rawval))

InterpolationError.__init__(self, option, section, msg)

self.args = (option, section, rawval)

class ParsingError(Error):

"""Raised when a configuration file does not follow legal syntax."""

def __init__(self, source):

super().__init__(f'Source contains parsing errors: {source!r}')

self.source = source

self.errors = []

self.args = (source, )

def append(self, lineno, line):

self.errors.append((lineno, line))

self.message += '\n\t[line %2d]: %s' % (lineno, line)

class MissingSectionHeaderError(ParsingError):

"""Raised when a key-value pair is found before any section header."""

def __init__(self, filename, lineno, line):

Error.__init__(

self,

'File contains no section headers.\nfile: %r, line: %d\n%r' %

(filename, lineno, line))

self.source = filename

self.lineno = lineno

self.line = line

self.args = (filename, lineno, line)

# Used in parser getters to indicate the default behaviour when a specific

# option is not found it to raise an exception. Created to enable `None` as

# a valid fallback value.

_UNSET = object()

class Interpolation:

"""Dummy interpolation that passes the value through with no changes."""

def before_get(self, parser, section, option, value, defaults):

return value

def before_set(self, parser, section, option, value):

return value

def before_read(self, parser, section, option, value):

return value

def before_write(self, parser, section, option, value):

return value

class BasicInterpolation(Interpolation):

"""Interpolation as implemented in the classic ConfigParser.

The option values can contain format strings which refer to other values in

the same section, or values in the special default section.

For example:

something: %(dir)s/whatever

would resolve the "%(dir)s" to the value of dir. All reference

expansions are done late, on demand. If a user needs to use a bare % in

a configuration file, she can escape it by writing %%. Other % usage

is considered a user error and raises `InterpolationSyntaxError`."""

_KEYCRE = re.compile(r"%$([^)]+)$s")

def before_get(self, parser, section, option, value, defaults):

L = []

self._interpolate_some(parser, option, L, value, section, defaults, 1)

return ''.join(L)

def before_set(self, parser, section, option, value):

tmp_value = value.replace('%%', '') # escaped percent signs

tmp_value = self._KEYCRE.sub('', tmp_value) # valid syntax

if '%' in tmp_value:

raise ValueError("invalid interpolation syntax in %r at "

"position %d" % (value, tmp_value.find('%')))

return value

def _interpolate_some(self, parser, option, accum, rest, section, map,

depth):

rawval = parser.get(section, option, raw=True, fallback=rest)

if depth > MAX_INTERPOLATION_DEPTH:

raise InterpolationDepthError(option, section, rawval)

while rest:

p = rest.find("%")

if p < 0:

accum.append(rest)

return

if p > 0:

accum.append(rest[:p])

rest = rest[p:]

# p is no longer used

c = rest[1:2]

if c == "%":

accum.append("%")

rest = rest[2:]

elif c == "(":

m = self._KEYCRE.match(rest)

if m is None:

raise InterpolationSyntaxError(option, section,

"bad interpolation variable reference %r" % rest)

var = parser.optionxform(m.group(1))

rest = rest[m.end():]

try:

v = map[var]

except KeyError:

raise InterpolationMissingOptionError(

option, section, rawval, var) from None

if "%" in v:

self._interpolate_some(parser, option, accum, v,

section, map, depth + 1)

else:

accum.append(v)

else:

raise InterpolationSyntaxError(

option, section,

"'%%' must be followed by '%%' or '(', "

"found: %r" % (rest,))

class ExtendedInterpolation(Interpolation):

"""Advanced variant of interpolation, supports the syntax used by

`zc.buildout`. Enables interpolation between sections."""

_KEYCRE = re.compile(r"\$\{([^}]+)\}")

def before_get(self, parser, section, option, value, defaults):

L = []

self._interpolate_some(parser, option, L, value, section, defaults, 1)

return ''.join(L)

def before_set(self, parser, section, option, value):

tmp_value = value.replace('$$', '') # escaped dollar signs

tmp_value = self._KEYCRE.sub('', tmp_value) # valid syntax

if '$' in tmp_value:

raise ValueError("invalid interpolation syntax in %r at "

"position %d" % (value, tmp_value.find('$')))

return value

def _interpolate_some(self, parser, option, accum, rest, section, map,

depth):

rawval = parser.get(section, option, raw=True, fallback=rest)

if depth > MAX_INTERPOLATION_DEPTH:

raise InterpolationDepthError(option, section, rawval)

while rest:

p = rest.find("$")

if p < 0:

accum.append(rest)

return

if p > 0:

accum.append(rest[:p])

rest = rest[p:]

# p is no longer used

c = rest[1:2]

if c == "$":

accum.append("$")

rest = rest[2:]

elif c == "{":

m = self._KEYCRE.match(rest)

if m is None:

raise InterpolationSyntaxError(option, section,

"bad interpolation variable reference %r" % rest)

path = m.group(1).split(':')

rest = rest[m.end():]

sect = section

opt = option

try:

if len(path) == 1:

opt = parser.optionxform(path[0])

v = map[opt]

elif len(path) == 2:

sect = path[0]

opt = parser.optionxform(path[1])

v = parser.get(sect, opt, raw=True)

else:

raise InterpolationSyntaxError(

option, section,

"More than one ':' found: %r" % (rest,))

except (KeyError, NoSectionError, NoOptionError):

raise InterpolationMissingOptionError(

option, section, rawval, ":".join(path)) from None

if "$" in v:

self._interpolate_some(parser, opt, accum, v, sect,

dict(parser.items(sect, raw=True)),

depth + 1)

else:

accum.append(v)

else:

raise InterpolationSyntaxError(

option, section,

"'$' must be followed by '$' or '{', "

"found: %r" % (rest,))

class RawConfigParser(MutableMapping):

"""ConfigParser that does not do interpolation."""

# Regular expressions for parsing section headers and options

_SECT_TMPL = r"""

\[ # [

(?P<header>.+) # very permissive!

\] # ]

"""

_OPT_TMPL = r"""

(?P<option>.*?) # very permissive!

\s*(?P<vi>{delim})\s* # any number of space/tab,

# followed by any of the

# allowed delimiters,

# followed by any space/tab

(?P<value>.*)$ # everything up to eol

"""

_OPT_NV_TMPL = r"""

(?P<option>.*?) # very permissive!

\s*(?: # any number of space/tab,

(?P<vi>{delim})\s* # optionally followed by

# any of the allowed

# delimiters, followed by any

# space/tab

(?P<value>.*))?$ # everything up to eol

"""

# Interpolation algorithm to be used if the user does not specify another

_DEFAULT_INTERPOLATION = Interpolation()

# Compiled regular expression for matching sections

SECTCRE = re.compile(_SECT_TMPL, re.VERBOSE)

# Compiled regular expression for matching options with typical separators

OPTCRE = re.compile(_OPT_TMPL.format(delim="=|:"), re.VERBOSE)

# Compiled regular expression for matching options with optional values

# delimited using typical separators

OPTCRE_NV = re.compile(_OPT_NV_TMPL.format(delim="=|:"), re.VERBOSE)

# Compiled regular expression for matching leading whitespace in a line

NONSPACECRE = re.compile(r"\S")

# Possible boolean values in the configuration.

BOOLEAN_STATES = {'1': True, 'yes': True, 'true': True, 'on': True,

'0': False, 'no': False, 'false': False, 'off': False}

def __init__(self, defaults=None, dict_type=_default_dict,

allow_no_value=False, *, delimiters=('=', ':'),

comment_prefixes=('#', ';'), inline_comment_prefixes=None,

strict=True, empty_lines_in_values=True,

default_section=DEFAULTSECT,

interpolation=_UNSET, converters=_UNSET):

self._dict = dict_type

self._sections = self._dict()

self._defaults = self._dict()

self._converters = ConverterMapping(self)

self._proxies = self._dict()

self._proxies[default_section] = SectionProxy(self, default_section)

self._delimiters = tuple(delimiters)

if delimiters == ('=', ':'):

self._optcre = self.OPTCRE_NV if allow_no_value else self.OPTCRE

else:

d = "|".join(re.escape(d) for d in delimiters)

if allow_no_value:

self._optcre = re.compile(self._OPT_NV_TMPL.format(delim=d),

re.VERBOSE)

else:

self._optcre = re.compile(self._OPT_TMPL.format(delim=d),

re.VERBOSE)

self._comment_prefixes = tuple(comment_prefixes or ())

self._inline_comment_prefixes = tuple(inline_comment_prefixes or ())

self._strict = strict

self._allow_no_value = allow_no_value

self._empty_lines_in_values = empty_lines_in_values

self.default_section=default_section

self._interpolation = interpolation

if self._interpolation is _UNSET:

self._interpolation = self._DEFAULT_INTERPOLATION

if self._interpolation is None:

self._interpolation = Interpolation()

if not isinstance(self._interpolation, Interpolation):

raise TypeError(

f"interpolation= must be None or an instance of Interpolation;"

f" got an object of type {type(self._interpolation)}"

)

if converters is not _UNSET:

self._converters.update(converters)

if defaults:

self._read_defaults(defaults)

def defaults(self):

return self._defaults

def sections(self):

"""Return a list of section names, excluding [DEFAULT]"""

# self._sections will never have [DEFAULT] in it

return list(self._sections.keys())

def add_section(self, section):

"""Create a new section in the configuration.

Raise DuplicateSectionError if a section by the specified name

already exists. Raise ValueError if name is DEFAULT.

"""

if section == self.default_section:

raise ValueError('Invalid section name: %r' % section)

if section in self._sections:

raise DuplicateSectionError(section)

self._sections[section] = self._dict()

self._proxies[section] = SectionProxy(self, section)

def has_section(self, section):

"""Indicate whether the named section is present in the configuration.

The DEFAULT section is not acknowledged.

"""

return section in self._sections

def options(self, section):

"""Return a list of option names for the given section name."""

try:

opts = self._sections[section].copy()

except KeyError:

raise NoSectionError(section) from None

opts.update(self._defaults)

return list(opts.keys())

def read(self, filenames, encoding=None):

"""Read and parse a filename or an iterable of filenames.

Files that cannot be opened are silently ignored; this is

designed so that you can specify an iterable of potential

configuration file locations (e.g. current directory, user's

home directory, systemwide directory), and all existing

configuration files in the iterable will be read. A single

filename may also be given.

Return list of successfully read files.

"""

if isinstance(filenames, (str, bytes, os.PathLike)):

filenames = [filenames]

encoding = io.text_encoding(encoding)

read_ok = []

for filename in filenames:

try:

with open(filename, encoding=encoding) as fp:

self._read(fp, filename)

except OSError:

continue

if isinstance(filename, os.PathLike):

filename = os.fspath(filename)

read_ok.append(filename)

return read_ok

def read_file(self, f, source=None):

"""Like read() but the argument must be a file-like object.

The `f` argument must be iterable, returning one line at a time.

Optional second argument is the `source` specifying the name of the

file being read. If not given, it is taken from f.name. If `f` has no

`name` attribute, `<???>` is used.

"""

if source is None:

try:

source = f.name

except AttributeError:

source = '<???>'

self._read(f, source)

def read_string(self, string, source='<string>'):

"""Read configuration from a given string."""

sfile = io.StringIO(string)

self.read_file(sfile, source)

def read_dict(self, dictionary, source='<dict>'):

"""Read configuration from a dictionary.

Keys are section names, values are dictionaries with keys and values

that should be present in the section. If the used dictionary type

preserves order, sections and their keys will be added in order.

All types held in the dictionary are converted to strings during

reading, including section names, option names and keys.

Optional second argument is the `source` specifying the name of the

dictionary being read.

"""

elements_added = set()

for section, keys in dictionary.items():

section = str(section)

try:

self.add_section(section)

except (DuplicateSectionError, ValueError):

if self._strict and section in elements_added:

raise

elements_added.add(section)

for key, value in keys.items():

key = self.optionxform(str(key))

if value is not None:

value = str(value)

if self._strict and (section, key) in elements_added:

raise DuplicateOptionError(section, key, source)

elements_added.add((section, key))

self.set(section, key, value)

def get(self, section, option, *, raw=False, vars=None, fallback=_UNSET):

"""Get an option value for a given section.

If `vars` is provided, it must be a dictionary. The option is looked up

in `vars` (if provided), `section`, and in `DEFAULTSECT` in that order.

If the key is not found and `fallback` is provided, it is used as

a fallback value. `None` can be provided as a `fallback` value.

If interpolation is enabled and the optional argument `raw` is False,

all interpolations are expanded in the return values.

Arguments `raw`, `vars`, and `fallback` are keyword only.

The section DEFAULT is special.

"""

try:

d = self._unify_values(section, vars)

except NoSectionError:

if fallback is _UNSET:

raise

else:

return fallback

option = self.optionxform(option)

try:

value = d[option]

except KeyError:

if fallback is _UNSET:

raise NoOptionError(option, section)

else:

return fallback

if raw or value is None:

return value

else:

return self._interpolation.before_get(self, section, option, value,

def _get(self, section, conv, option, **kwargs):

return conv(self.get(section, option, **kwargs))

def _get_conv(self, section, option, conv, *, raw=False, vars=None,

fallback=_UNSET, **kwargs):

try:

return self._get(section, conv, option, raw=raw, vars=vars,

**kwargs)

except (NoSectionError, NoOptionError):

if fallback is _UNSET:

raise

return fallback

# getint, getfloat and getboolean provided directly for backwards compat

def getint(self, section, option, *, raw=False, vars=None,

fallback=_UNSET, **kwargs):

return self._get_conv(section, option, int, raw=raw, vars=vars,

fallback=fallback, **kwargs)

def getfloat(self, section, option, *, raw=False, vars=None,

fallback=_UNSET, **kwargs):

return self._get_conv(section, option, float, raw=raw, vars=vars,

fallback=fallback, **kwargs)

def getboolean(self, section, option, *, raw=False, vars=None,

fallback=_UNSET, **kwargs):

return self._get_conv(section, option, self._convert_to_boolean,

raw=raw, vars=vars, fallback=fallback, **kwargs)

def items(self, section=_UNSET, raw=False, vars=None):

"""Return a list of (name, value) tuples for each option in a section.

All % interpolations are expanded in the return values, based on the

defaults passed into the constructor, unless the optional argument

`raw` is true. Additional substitutions may be provided using the

`vars` argument, which must be a dictionary whose contents overrides

any pre-existing defaults.

The section DEFAULT is special.

"""

if section is _UNSET:

return super().items()

d = self._defaults.copy()

try:

d.update(self._sections[section])

except KeyError:

if section != self.default_section:

raise NoSectionError(section)

orig_keys = list(d.keys())

# Update with the entry specific variables

if vars:

for key, value in vars.items():

d[self.optionxform(key)] = value

value_getter = lambda option: self._interpolation.before_get(self,

section, option, d[option], d)

if raw:

value_getter = lambda option: d[option]

return [(option, value_getter(option)) for option in orig_keys]

def popitem(self):

"""Remove a section from the parser and return it as

a (section_name, section_proxy) tuple. If no section is present, raise

KeyError.

The section DEFAULT is never returned because it cannot be removed.

"""

for key in self.sections():

value = self[key]

del self[key]

return key, value

raise KeyError

def optionxform(self, optionstr):

return optionstr.lower()

def has_option(self, section, option):

"""Check for the existence of a given option in a given section.

If the specified `section` is None or an empty string, DEFAULT is

assumed. If the specified `section` does not exist, returns False."""

if not section or section == self.default_section:

option = self.optionxform(option)

return option in self._defaults

elif section not in self._sections:

return False

else:

option = self.optionxform(option)

return (option in self._sections[section]

or option in self._defaults)

def set(self, section, option, value=None):

"""Set an option."""

if value:

value = self._interpolation.before_set(self, section, option,

value)

if not section or section == self.default_section:

sectdict = self._defaults

else:

try:

sectdict = self._sections[section]

except KeyError:

raise NoSectionError(section) from None

sectdict[self.optionxform(option)] = value

def write(self, fp, space_around_delimiters=True):

"""Write an .ini-format representation of the configuration state.

If `space_around_delimiters` is True (the default), delimiters

between keys and values are surrounded by spaces.

Please note that comments in the original configuration file are not

preserved when writing the configuration back.

"""

if space_around_delimiters:

d = " {} ".format(self._delimiters[0])

else:

d = self._delimiters[0]

if self._defaults:

self._write_section(fp, self.default_section,

self._defaults.items(), d)

for section in self._sections:

self._write_section(fp, section,

self._sections[section].items(), d)

def _write_section(self, fp, section_name, section_items, delimiter):

"""Write a single section to the specified `fp`."""

fp.write("[{}]\n".format(section_name))

for key, value in section_items:

value = self._interpolation.before_write(self, section_name, key,

value)

if value is not None or not self._allow_no_value:

value = delimiter + str(value).replace('\n', '\n\t')

else:

value = ""

fp.write("{}{}\n".format(key, value))

fp.write("\n")

def remove_option(self, section, option):

"""Remove an option."""

if not section or section == self.default_section:

sectdict = self._defaults

else:

try:

sectdict = self._sections[section]

except KeyError:

raise NoSectionError(section) from None

option = self.optionxform(option)

existed = option in sectdict

if existed:

del sectdict[option]

return existed

def remove_section(self, section):

"""Remove a file section."""

existed = section in self._sections

if existed:

del self._sections[section]

del self._proxies[section]

return existed

def __getitem__(self, key):

if key != self.default_section and not self.has_section(key):

raise KeyError(key)

return self._proxies[key]

def __setitem__(self, key, value):

# To conform with the mapping protocol, overwrites existing values in

# the section.

if key in self and self[key] is value:

return

# XXX this is not atomic if read_dict fails at any point. Then again,

# no update method in configparser is atomic in this implementation.

if key == self.default_section:

self._defaults.clear()

elif key in self._sections:

self._sections[key].clear()

self.read_dict({key: value})

def __delitem__(self, key):

if key == self.default_section:

raise ValueError("Cannot remove the default section.")

if not self.has_section(key):

raise KeyError(key)

self.remove_section(key)

def __contains__(self, key):

return key == self.default_section or self.has_section(key)

def __len__(self):

return len(self._sections) + 1 # the default section

def __iter__(self):

# XXX does it break when underlying container state changed?

return itertools.chain((self.default_section,), self._sections.keys())

def _read(self, fp, fpname):

"""Parse a sectioned configuration file.

Each section in a configuration file contains a header, indicated by

a name in square brackets (`[]`), plus key/value options, indicated by

`name` and `value` delimited with a specific substring (`=` or `:` by

default).

Values can span multiple lines, as long as they are indented deeper

than the first line of the value. Depending on the parser's mode, blank

lines may be treated as parts of multiline values or ignored.

Configuration files may include comments, prefixed by specific

characters (`#` and `;` by default). Comments may appear on their own

in an otherwise empty line or may be entered in lines holding values or

section names. Please note that comments get stripped off when reading configuration files.

"""

elements_added = set()

cursect = None # None, or a dictionary

sectname = None

optname = None

lineno = 0

indent_level = 0

e = None # None, or an exception

for lineno, line in enumerate(fp, start=1):

comment_start = sys.maxsize

# strip inline comments

inline_prefixes = {p: -1 for p in self._inline_comment_prefixes}

while comment_start == sys.maxsize and inline_prefixes:

next_prefixes = {}

for prefix, index in inline_prefixes.items():

index = line.find(prefix, index+1)

if index == -1:

continue

next_prefixes[prefix] = index

if index == 0 or (index > 0 and line[index-1].isspace()):

comment_start = min(comment_start, index)

inline_prefixes = next_prefixes

# strip full line comments

for prefix in self._comment_prefixes:

if line.strip().startswith(prefix):

comment_start = 0

break

if comment_start == sys.maxsize:

comment_start = None

value = line[:comment_start].strip()

if not value:

if self._empty_lines_in_values:

# add empty line to the value, but only if there was no

# comment on the line

if (comment_start is None and

cursect is not None and

optname and

cursect[optname] is not None):

cursect[optname].append('') # newlines added at join

else:

# empty line marks end of value

indent_level = sys.maxsize

continue

# continuation line?

first_nonspace = self.NONSPACECRE.search(line)

cur_indent_level = first_nonspace.start() if first_nonspace else 0

if (cursect is not None and optname and

cur_indent_level > indent_level):

cursect[optname].append(value)

# a section header or option header?

else:

indent_level = cur_indent_level

# is it a section header?

mo = self.SECTCRE.match(value)

if mo:

sectname = mo.group('header')

if sectname in self._sections:

if self._strict and sectname in elements_added:

raise DuplicateSectionError(sectname, fpname,

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cpython/Lib/configparser.py at main · https-github-com-nzysoft/cpython · GitHub

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