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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=, converters=): 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.buildbot`` 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 import warnings __all__ = ["NoSectionError", "DuplicateOptionError", "DuplicateSectionError", "NoOptionError", "InterpolationError", "InterpolationDepthError", "InterpolationMissingOptionError", "InterpolationSyntaxError", "ParsingError", "MissingSectionHeaderError", "ConfigParser", "SafeConfigParser", "RawConfigParser", "Interpolation", "BasicInterpolation", "ExtendedInterpolation", "LegacyInterpolation", "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=None, filename=None): # Exactly one of `source'/`filename' arguments has to be given. # `filename' kept for compatibility. if filename and source: raise ValueError("Cannot specify both `filename' and `source'. " "Use `source'.") elif not filename and not source: raise ValueError("Required argument `source' not given.") elif filename: source = filename Error.__init__(self, 'Source contains parsing errors: %r' % source) self.source = source self.errors = [] self.args = (source, ) @property def filename(self): """Deprecated, use `source'.""" warnings.warn( "The 'filename' attribute will be removed in future versions. " "Use 'source' instead.", DeprecationWarning, stacklevel=2 ) return self.source @filename.setter def filename(self, value): """Deprecated, user `source'.""" warnings.warn( "The 'filename' attribute will be removed in future versions. " "Use 'source' instead.", DeprecationWarning, stacklevel=2 ) self.source = value 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 LegacyInterpolation(Interpolation): """Deprecated interpolation used in old versions of ConfigParser. Use BasicInterpolation or ExtendedInterpolation instead.""" _KEYCRE = re.compile(r"%\(([^)]*)\)s|.") def before_get(self, parser, section, option, value, vars): rawval = value depth = MAX_INTERPOLATION_DEPTH while depth: # Loop through this until it's done depth -= 1 if value and "%(" in value: replace = functools.partial(self._interpolation_replace, parser=parser) value = self._KEYCRE.sub(replace, value) try: value = value % vars except KeyError as e: raise InterpolationMissingOptionError( option, section, rawval, e.args[0]) from None else: break if value and "%(" in value: raise InterpolationDepthError(option, section, rawval) return value def before_set(self, parser, section, option, value): return value @staticmethod def _interpolation_replace(match, parser): s = match.group(1) if s is None: return match.group() else: return "%%(%s)s" % parser.optionxform(s) class RawConfigParser(MutableMapping): """ConfigParser that does not do interpolation.""" # Regular expressions for parsing section headers and options _SECT_TMPL = r""" \[ # [ (?P

[^]]+) # very permissive! \] # ] """ _OPT_TMPL = r""" (?P.*?) # very permissive! \s*(?P{delim})\s* # any number of space/tab, # followed by any of the # allowed delimiters, # followed by any space/tab (?P.*)$ # everything up to eol """ _OPT_NV_TMPL = r""" (?P.*?) # very permissive! \s*(?: # any number of space/tab, (?P{delim})\s* # optionally followed by # any of the allowed # delimiters, followed by any # space/tab (?P.*))?$ # 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 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] 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=''): """Read configuration from a given string.""" sfile = io.StringIO(string) self.read_file(sfile, source) def read_dict(self, dictionary, source=''): """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 readfp(self, fp, filename=None): """Deprecated, use read_file instead.""" warnings.warn( "This method will be removed in future versions. " "Use 'parser.read_file()' instead.", DeprecationWarning, stacklevel=2 ) self.read_file(fp, source=filename) 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, d) 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. """ 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. """ 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, lineno) cursect = self._sections[sectname] elements_added.add(sectname) elif sectname == self.default_section: cursect = self._defaults else: cursect = self._dict() self._sections[sectname] = cursect self._proxies[sectname] = SectionProxy(self, sectname) elements_added.add(sectname) # So sections can't start with a continuation line optname = None # no section header in the file? elif cursect is None: raise MissingSectionHeaderError(fpname, lineno, line) # an option line? else: mo = self._optcre.match(value) if mo: optname, vi, optval = mo.group('option', 'vi', 'value') if not optname: e = self._handle_error(e, fpname, lineno, line) optname = self.optionxform(optname.rstrip()) if (self._strict and (sectname, optname) in elements_added): raise DuplicateOptionError(sectname, optname, fpname, lineno) elements_added.add((sectname, optname)) # This check is fine because the OPTCRE cannot # match if it would set optval to None if optval is not None: optval = optval.strip() cursect[optname] = [optval] else: # valueless option handling cursect[optname] = None else: # a non-fatal parsing error occurred. set up the # exception but keep going. the exception will be # raised at the end of the file and will contain a # list of all bogus lines e = self._handle_error(e, fpname, lineno, line) self._join_multiline_values() # if any parsing errors occurred, raise an exception if e: raise e def _join_multiline_values(self): defaults = self.default_section, self._defaults all_sections = itertools.chain((defaults,), self._sections.items()) for section, options in all_sections: for name, val in options.items(): if isinstance(val, list): val = '\n'.join(val).rstrip() options[name] = self._interpolation.before_read(self, section, name, val) def _read_defaults(self, defaults): """Read the defaults passed in the initializer. Note: values can be non-string.""" for key, value in defaults.items(): self._defaults[self.optionxform(key)] = value def _handle_error(self, exc, fpname, lineno, line): if not exc: exc = ParsingError(fpname) exc.append(lineno, repr(line)) return exc def _unify_values(self, section, vars): """Create a sequence of lookups with 'vars' taking priority over the 'section' which takes priority over the DEFAULTSECT. """ sectiondict = {} try: sectiondict = self._sections[section] except KeyError: if section != self.default_section: raise NoSectionError(section) from None # Update with the entry specific variables vardict = {} if vars: for key, value in vars.items(): if value is not None: value = str(value) vardict[self.optionxform(key)] = value return _ChainMap(vardict, sectiondict, self._defaults) def _convert_to_boolean(self, value): """Return a boolean value translating from other types if necessary. """ if value.lower() not in self.BOOLEAN_STATES: raise ValueError('Not a boolean: %s' % value) return self.BOOLEAN_STATES[value.lower()] def _validate_value_types(self, *, section="", option="", value=""): """Raises a TypeError for non-string values. The only legal non-string value if we allow valueless options is None, so we need to check if the value is a string if: - we do not allow valueless options, or - we allow valueless options but the value is not None For compatibility reasons this method is not used in classic set() for RawConfigParsers. It is invoked in every case for mapping protocol access and in ConfigParser.set(). """ if not isinstance(section, str): raise TypeError("section names must be strings") if not isinstance(option, str): raise TypeError("option keys must be strings") if not self._allow_no_value or value: if not isinstance(value, str): raise TypeError("option values must be strings") @property def converters(self): return self._converters class ConfigParser(RawConfigParser): """ConfigParser implementing interpolation.""" _DEFAULT_INTERPOLATION = BasicInterpolation() def set(self, section, option, value=None): """Set an option. Extends RawConfigParser.set by validating type and interpolation syntax on the value.""" self._validate_value_types(option=option, value=value) super().set(section, option, value) def add_section(self, section): """Create a new section in the configuration. Extends RawConfigParser.add_section by validating if the section name is a string.""" self._validate_value_types(section=section) super().add_section(section) def _read_defaults(self, defaults): """Reads the defaults passed in the initializer, implicitly converting values to strings like the rest of the API. Does not perform interpolation for backwards compatibility. """ try: hold_interpolation = self._interpolation self._interpolation = Interpolation() self.read_dict({self.default_section: defaults}) finally: self._interpolation = hold_interpolation class SafeConfigParser(ConfigParser): """ConfigParser alias for backwards compatibility purposes.""" def __init__(self, *args, **kwargs): super().__init__(*args, **kwargs) warnings.warn( "The SafeConfigParser class has been renamed to ConfigParser " "in Python 3.2. This alias will be removed in future versions." " Use ConfigParser directly instead.", DeprecationWarning, stacklevel=2 ) class SectionProxy(MutableMapping): """A proxy for a single section from a parser.""" def __init__(self, parser, name): """Creates a view on a section of the specified `name` in `parser`.""" self._parser = parser self._name = name for conv in parser.converters: key = 'get' + conv getter = functools.partial(self.get, _impl=getattr(parser, key)) setattr(self, key, getter) def __repr__(self): return ''.format(self._name) def __getitem__(self, key): if not self._parser.has_option(self._name, key): raise KeyError(key) return self._parser.get(self._name, key) def __setitem__(self, key, value): self._parser._validate_value_types(option=key, value=value) return self._parser.set(self._name, key, value) def __delitem__(self, key): if not (self._parser.has_option(self._name, key) and self._parser.remove_option(self._name, key)): raise KeyError(key) def __contains__(self, key): return self._parser.has_option(self._name, key) def __len__(self): return len(self._options()) def __iter__(self): return self._options().__iter__() def _options(self): if self._name != self._parser.default_section: return self._parser.options(self._name) else: return self._parser.defaults() @property def parser(self): # The parser object of the proxy is read-only. return self._parser @property def name(self): # The name of the section on a proxy is read-only. return self._name def get(self, option, fallback=None, *, raw=False, vars=None, _impl=None, **kwargs): """Get an option value. Unless `fallback` is provided, `None` will be returned if the option is not found. """ # If `_impl` is provided, it should be a getter method on the parser # object that provides the desired type conversion. if not _impl: _impl = self._parser.get return _impl(self._name, option, raw=raw, vars=vars, fallback=fallback, **kwargs) class ConverterMapping(MutableMapping): """Enables reuse of get*() methods between the parser and section proxies. If a parser class implements a getter directly, the value for the given key will be ``None``. The presence of the converter name here enables section proxies to find and use the implementation on the parser class. """ GETTERCRE = re.compile(r"^get(?P.+)$") def __init__(self, parser): self._parser = parser self._data = {} for getter in dir(self._parser): m = self.GETTERCRE.match(getter) if not m or not callable(getattr(self._parser, getter)): continue self._data[m.group('name')] = None # See class docstring. def __getitem__(self, key): return self._data[key] def __setitem__(self, key, value): try: k = 'get' + key except TypeError: raise ValueError('Incompatible key: {} (type: {})' ''.format(key, type(key))) if k == 'get': raise ValueError('Incompatible key: cannot use "" as a name') self._data[key] = value func = functools.partial(self._parser._get_conv, conv=value) func.converter = value setattr(self._parser, k, func) for proxy in self._parser.values(): getter = functools.partial(proxy.get, _impl=func) setattr(proxy, k, getter) def __delitem__(self, key): try: k = 'get' + (key or None) except TypeError: raise KeyError(key) del self._data[key] for inst in itertools.chain((self._parser,), self._parser.values()): try: delattr(inst, k) except AttributeError: # don't raise since the entry was present in _data, silently # clean up continue def __iter__(self): return iter(self._data) def __len__(self): return len(self._data)