822 lines
30 KiB
Python
822 lines
30 KiB
Python
"""Configuration file parser.
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A configuration file consists of sections, lead by a "[section]" header,
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and followed by "name: value" entries, with continuations and such in
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the style of RFC 822.
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The option values can contain format strings which refer to other values in
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the same section, or values in a special [DEFAULT] section.
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For example:
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something: %(dir)s/whatever
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would resolve the "%(dir)s" to the value of dir. All reference
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expansions are done late, on demand.
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Intrinsic defaults can be specified by passing them into the
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ConfigParser constructor as a dictionary.
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class:
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ConfigParser -- responsible for parsing a list of
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configuration files, and managing the parsed database.
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methods:
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__init__(defaults=None, dict_type=_default_dict,
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delimiters=('=', ':'), comment_prefixes=('#', ';'),
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empty_lines_in_values=True, allow_no_value=False):
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Create the parser. When `defaults' is given, it is initialized into the
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dictionary or intrinsic defaults. The keys must be strings, the values
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must be appropriate for %()s string interpolation. Note that `__name__'
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is always an intrinsic default; its value is the section's name.
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When `dict_type' is given, it will be used to create the dictionary
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objects for the list of sections, for the options within a section, and
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for the default values.
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When `delimiters' is given, it will be used as the set of substrings
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that divide keys from values.
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When `comment_prefixes' is given, it will be used as the set of
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substrings that prefix comments in a line.
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When `empty_lines_in_values' is False (default: True), each empty line
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marks the end of an option. Otherwise, internal empty lines of
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a multiline option are kept as part of the value.
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When `allow_no_value' is True (default: False), options without
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values are accepted; the value presented for these is None.
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sections()
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Return all the configuration section names, sans DEFAULT.
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has_section(section)
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Return whether the given section exists.
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has_option(section, option)
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Return whether the given option exists in the given section.
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options(section)
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Return list of configuration options for the named section.
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read(filenames)
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Read and parse the list of named configuration files, given by
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name. A single filename is also allowed. Non-existing files
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are ignored. Return list of successfully read files.
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readfp(fp, filename=None)
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Read and parse one configuration file, given as a file object.
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The filename defaults to fp.name; it is only used in error
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messages (if fp has no `name' attribute, the string `<???>' is used).
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get(section, option, raw=False, vars=None)
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Return a string value for the named option. All % interpolations are
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expanded in the return values, based on the defaults passed into the
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constructor and the DEFAULT section. Additional substitutions may be
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provided using the `vars' argument, which must be a dictionary whose
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contents override any pre-existing defaults.
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getint(section, options)
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Like get(), but convert value to an integer.
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getfloat(section, options)
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Like get(), but convert value to a float.
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getboolean(section, options)
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Like get(), but convert value to a boolean (currently case
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insensitively defined as 0, false, no, off for False, and 1, true,
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yes, on for True). Returns False or True.
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items(section, raw=False, vars=None)
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Return a list of tuples with (name, value) for each option
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in the section.
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remove_section(section)
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Remove the given file section and all its options.
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remove_option(section, option)
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Remove the given option from the given section.
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set(section, option, value)
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Set the given option.
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write(fp, space_around_delimiters=True)
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Write the configuration state in .ini format. If
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`space_around_delimiters' is True (the default), delimiters
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between keys and values are surrounded by spaces.
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"""
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try:
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from collections import OrderedDict as _default_dict
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except ImportError:
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# fallback for setup.py which hasn't yet built _collections
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_default_dict = dict
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import re
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import sys
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__all__ = ["NoSectionError", "DuplicateSectionError", "NoOptionError",
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"InterpolationError", "InterpolationDepthError",
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"InterpolationSyntaxError", "ParsingError",
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"MissingSectionHeaderError",
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"ConfigParser", "SafeConfigParser", "RawConfigParser",
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"DEFAULTSECT", "MAX_INTERPOLATION_DEPTH"]
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DEFAULTSECT = "DEFAULT"
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MAX_INTERPOLATION_DEPTH = 10
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# exception classes
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class Error(Exception):
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"""Base class for ConfigParser exceptions."""
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def _get_message(self):
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"""Getter for 'message'; needed only to override deprecation in
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BaseException.
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"""
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return self.__message
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def _set_message(self, value):
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"""Setter for 'message'; needed only to override deprecation in
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BaseException.
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"""
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self.__message = value
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# BaseException.message has been deprecated since Python 2.6. To prevent
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# DeprecationWarning from popping up over this pre-existing attribute, use a
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# new property that takes lookup precedence.
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message = property(_get_message, _set_message)
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def __init__(self, msg=''):
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self.message = msg
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Exception.__init__(self, msg)
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def __repr__(self):
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return self.message
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__str__ = __repr__
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class NoSectionError(Error):
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"""Raised when no section matches a requested option."""
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def __init__(self, section):
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Error.__init__(self, 'No section: %r' % (section,))
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self.section = section
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self.args = (section, )
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class DuplicateSectionError(Error):
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"""Raised when a section is multiply-created."""
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def __init__(self, section):
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Error.__init__(self, "Section %r already exists" % section)
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self.section = section
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self.args = (section, )
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class NoOptionError(Error):
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"""A requested option was not found."""
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def __init__(self, option, section):
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Error.__init__(self, "No option %r in section: %r" %
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(option, section))
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self.option = option
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self.section = section
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self.args = (option, section)
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class InterpolationError(Error):
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"""Base class for interpolation-related exceptions."""
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def __init__(self, option, section, msg):
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Error.__init__(self, msg)
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self.option = option
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self.section = section
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self.args = (option, section, msg)
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class InterpolationMissingOptionError(InterpolationError):
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"""A string substitution required a setting which was not available."""
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def __init__(self, option, section, rawval, reference):
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msg = ("Bad value substitution:\n"
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"\tsection: [%s]\n"
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"\toption : %s\n"
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"\tkey : %s\n"
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"\trawval : %s\n"
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% (section, option, reference, rawval))
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InterpolationError.__init__(self, option, section, msg)
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self.reference = reference
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self.args = (option, section, rawval, reference)
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class InterpolationSyntaxError(InterpolationError):
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"""Raised when the source text into which substitutions are made
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does not conform to the required syntax."""
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class InterpolationDepthError(InterpolationError):
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"""Raised when substitutions are nested too deeply."""
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def __init__(self, option, section, rawval):
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msg = ("Value interpolation too deeply recursive:\n"
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"\tsection: [%s]\n"
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"\toption : %s\n"
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"\trawval : %s\n"
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% (section, option, rawval))
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InterpolationError.__init__(self, option, section, msg)
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self.args = (option, section, rawval)
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class ParsingError(Error):
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"""Raised when a configuration file does not follow legal syntax."""
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def __init__(self, filename):
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Error.__init__(self, 'File contains parsing errors: %s' % filename)
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self.filename = filename
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self.errors = []
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self.args = (filename, )
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def append(self, lineno, line):
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self.errors.append((lineno, line))
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self.message += '\n\t[line %2d]: %s' % (lineno, line)
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class MissingSectionHeaderError(ParsingError):
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"""Raised when a key-value pair is found before any section header."""
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def __init__(self, filename, lineno, line):
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Error.__init__(
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self,
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'File contains no section headers.\nfile: %s, line: %d\n%r' %
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(filename, lineno, line))
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self.filename = filename
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self.lineno = lineno
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self.line = line
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self.args = (filename, lineno, line)
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class RawConfigParser:
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"""ConfigParser that does not do interpolation."""
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# Regular expressions for parsing section headers and options
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_SECT_TMPL = r"""
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\[ # [
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(?P<header>[^]]+) # very permissive!
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\] # ]
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"""
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_OPT_TMPL = r"""
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(?P<option>.*?) # very permissive!
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\s*(?P<vi>{delim})\s* # any number of space/tab,
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# followed by any of the
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# allowed delimiters,
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# followed by any space/tab
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(?P<value>.*)$ # everything up to eol
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"""
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_OPT_NV_TMPL = r"""
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(?P<option>.*?) # very permissive!
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\s*(?: # any number of space/tab,
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(?P<vi>{delim})\s* # optionally followed by
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# any of the allowed
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# delimiters, followed by any
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# space/tab
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(?P<value>.*))?$ # everything up to eol
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"""
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# Compiled regular expression for matching sections
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SECTCRE = re.compile(_SECT_TMPL, re.VERBOSE)
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# Compiled regular expression for matching options with typical separators
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OPTCRE = re.compile(_OPT_TMPL.format(delim="=|:"), re.VERBOSE)
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# Compiled regular expression for matching options with optional values
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# delimited using typical separators
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OPTCRE_NV = re.compile(_OPT_NV_TMPL.format(delim="=|:"), re.VERBOSE)
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# Compiled regular expression for matching leading whitespace in a line
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NONSPACECRE = re.compile(r"\S")
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# Select backwards-compatible inline comment character behavior
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# (; and # are comments at the start of a line, but ; only inline)
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_COMPATIBLE = object()
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def __init__(self, defaults=None, dict_type=_default_dict,
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delimiters=('=', ':'), comment_prefixes=_COMPATIBLE,
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empty_lines_in_values=True, allow_no_value=False):
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self._dict = dict_type
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self._sections = self._dict()
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self._defaults = self._dict()
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if defaults:
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for key, value in defaults.items():
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self._defaults[self.optionxform(key)] = value
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self._delimiters = tuple(delimiters)
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if delimiters == ('=', ':'):
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self._optcre = self.OPTCRE_NV if allow_no_value else self.OPTCRE
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else:
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delim = "|".join(re.escape(d) for d in delimiters)
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if allow_no_value:
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self._optcre = re.compile(self._OPT_NV_TMPL.format(delim=delim),
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re.VERBOSE)
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else:
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self._optcre = re.compile(self._OPT_TMPL.format(delim=delim),
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re.VERBOSE)
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if comment_prefixes is self._COMPATIBLE:
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self._startonly_comment_prefixes = ('#',)
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self._comment_prefixes = (';',)
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else:
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self._startonly_comment_prefixes = ()
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self._comment_prefixes = tuple(comment_prefixes or ())
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self._empty_lines_in_values = empty_lines_in_values
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def defaults(self):
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return self._defaults
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def sections(self):
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"""Return a list of section names, excluding [DEFAULT]"""
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# self._sections will never have [DEFAULT] in it
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return list(self._sections.keys())
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def add_section(self, section):
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"""Create a new section in the configuration.
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Raise DuplicateSectionError if a section by the specified name
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already exists. Raise ValueError if name is DEFAULT or any of it's
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case-insensitive variants.
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"""
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if section.lower() == "default":
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raise ValueError('Invalid section name: %s' % section)
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if section in self._sections:
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raise DuplicateSectionError(section)
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self._sections[section] = self._dict()
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def has_section(self, section):
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"""Indicate whether the named section is present in the configuration.
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The DEFAULT section is not acknowledged.
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"""
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return section in self._sections
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def options(self, section):
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"""Return a list of option names for the given section name."""
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try:
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opts = self._sections[section].copy()
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except KeyError:
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raise NoSectionError(section)
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opts.update(self._defaults)
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if '__name__' in opts:
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del opts['__name__']
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return list(opts.keys())
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def read(self, filenames):
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"""Read and parse a filename or a list of filenames.
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Files that cannot be opened are silently ignored; this is
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designed so that you can specify a list of potential
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configuration file locations (e.g. current directory, user's
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home directory, systemwide directory), and all existing
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configuration files in the list will be read. A single
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filename may also be given.
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Return list of successfully read files.
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"""
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if isinstance(filenames, str):
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filenames = [filenames]
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read_ok = []
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for filename in filenames:
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try:
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fp = open(filename)
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except IOError:
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continue
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self._read(fp, filename)
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fp.close()
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read_ok.append(filename)
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return read_ok
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def readfp(self, fp, filename=None):
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"""Like read() but the argument must be a file-like object.
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The `fp' argument must have a `readline' method. Optional
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second argument is the `filename', which if not given, is
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taken from fp.name. If fp has no `name' attribute, `<???>' is
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used.
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"""
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if filename is None:
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try:
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filename = fp.name
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except AttributeError:
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filename = '<???>'
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self._read(fp, filename)
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def get(self, section, option):
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opt = self.optionxform(option)
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if section not in self._sections:
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if section != DEFAULTSECT:
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raise NoSectionError(section)
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if opt in self._defaults:
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return self._defaults[opt]
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else:
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raise NoOptionError(option, section)
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elif opt in self._sections[section]:
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return self._sections[section][opt]
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elif opt in self._defaults:
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return self._defaults[opt]
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else:
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raise NoOptionError(option, section)
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def items(self, section):
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try:
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d2 = self._sections[section]
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except KeyError:
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if section != DEFAULTSECT:
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raise NoSectionError(section)
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d2 = self._dict()
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d = self._defaults.copy()
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d.update(d2)
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if "__name__" in d:
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del d["__name__"]
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return d.items()
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def _get(self, section, conv, option):
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return conv(self.get(section, option))
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def getint(self, section, option):
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return self._get(section, int, option)
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def getfloat(self, section, option):
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return self._get(section, float, option)
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_boolean_states = {'1': True, 'yes': True, 'true': True, 'on': True,
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'0': False, 'no': False, 'false': False, 'off': False}
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def getboolean(self, section, option):
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v = self.get(section, option)
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if v.lower() not in self._boolean_states:
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raise ValueError('Not a boolean: %s' % v)
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return self._boolean_states[v.lower()]
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def optionxform(self, optionstr):
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return optionstr.lower()
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def has_option(self, section, option):
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"""Check for the existence of a given option in a given section."""
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|
|
|
if not section or section == DEFAULTSECT:
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option = self.optionxform(option)
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return option in self._defaults
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elif section not in self._sections:
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return False
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else:
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option = self.optionxform(option)
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return (option in self._sections[section]
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or option in self._defaults)
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|
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def set(self, section, option, value=None):
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"""Set an option."""
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|
|
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if not section or section == DEFAULTSECT:
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sectdict = self._defaults
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else:
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try:
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sectdict = self._sections[section]
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|
except KeyError:
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raise NoSectionError(section)
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sectdict[self.optionxform(option)] = value
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|
|
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def write(self, fp, space_around_delimiters=True):
|
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"""Write an .ini-format representation of the configuration state.
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|
|
|
If `space_around_delimiters' is True (the default), delimiters
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between keys and values are surrounded by spaces.
|
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"""
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|
if space_around_delimiters:
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d = " {} ".format(self._delimiters[0])
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else:
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d = self._delimiters[0]
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if self._defaults:
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self._write_section(fp, DEFAULTSECT, self._defaults.items(), d)
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for section in self._sections:
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self._write_section(fp, section,
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self._sections[section].items(), d)
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def _write_section(self, fp, section_name, section_items, delimiter):
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"""Write a single section to the specified `fp'."""
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fp.write("[{}]\n".format(section_name))
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for key, value in section_items:
|
|
if key == "__name__":
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continue
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if value is not None:
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value = delimiter + str(value).replace('\n', '\n\t')
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else:
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value = ""
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fp.write("{}{}\n".format(key, value))
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fp.write("\n")
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|
|
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def remove_option(self, section, option):
|
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"""Remove an option."""
|
|
if not section or section == DEFAULTSECT:
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sectdict = self._defaults
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|
else:
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try:
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sectdict = self._sections[section]
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|
except KeyError:
|
|
raise NoSectionError(section)
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|
option = self.optionxform(option)
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existed = option in sectdict
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if existed:
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del sectdict[option]
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return existed
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|
|
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def remove_section(self, section):
|
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"""Remove a file section."""
|
|
existed = section in self._sections
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if existed:
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del self._sections[section]
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return existed
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|
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def _read(self, fp, fpname):
|
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"""Parse a sectioned configuration file.
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Each section in a configuration file contains a header, indicated by a
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name in square brackets (`[]'), plus key/value options, indicated by
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`name' and `value' delimited with a specific substring (`=' or `:' by
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default).
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Values can span multiple lines, as long as they are indented deeper than
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the first line of the value. Depending on the parser's mode, blank lines
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may be treated as parts of multiline values or ignored.
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Configuration files may include comments, prefixed by specific
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characters (`#' and `;' by default). Comments may appear on their own in
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an otherwise empty line or may be entered in lines holding values or
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section names.
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"""
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cursect = None # None, or a dictionary
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optname = None
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lineno = 0
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indent_level = 0
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e = None # None, or an exception
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for lineno, line in enumerate(fp, start=1):
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# strip prefix-only comments
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comment_start = None
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for prefix in self._startonly_comment_prefixes:
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if line.strip().startswith(prefix):
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comment_start = 0
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break
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# strip inline comments
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for prefix in self._comment_prefixes:
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index = line.find(prefix)
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if index == 0 or (index > 0 and line[index-1].isspace()):
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comment_start = index
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break
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value = line[:comment_start].strip()
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if not value:
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if self._empty_lines_in_values and comment_start is None:
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# add empty line to the value, but only if there was no
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# comment on the line
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if cursect is not None and optname:
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cursect[optname].append('\n')
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else:
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# empty line marks end of value
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indent_level = sys.maxsize
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continue
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# continuation line?
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first_nonspace = self.NONSPACECRE.search(line)
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cur_indent_level = first_nonspace.start() if first_nonspace else 0
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if (cursect is not None and optname and
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cur_indent_level > indent_level):
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cursect[optname].append(value)
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# a section header or option header?
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else:
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indent_level = cur_indent_level
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# is it a section header?
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mo = self.SECTCRE.match(value)
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if mo:
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sectname = mo.group('header')
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if sectname in self._sections:
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cursect = self._sections[sectname]
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elif sectname == DEFAULTSECT:
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cursect = self._defaults
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else:
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cursect = self._dict()
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cursect['__name__'] = sectname
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self._sections[sectname] = cursect
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# So sections can't start with a continuation line
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optname = None
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# no section header in the file?
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elif cursect is None:
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raise MissingSectionHeaderError(fpname, lineno, line)
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# an option line?
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else:
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mo = self._optcre.match(value)
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if mo:
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optname, vi, optval = mo.group('option', 'vi', 'value')
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if not optname:
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e = self._handle_error(e, fpname, lineno, line)
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optname = self.optionxform(optname.rstrip())
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# This check is fine because the OPTCRE cannot
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# match if it would set optval to None
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if optval is not None:
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optval = optval.strip()
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# allow empty values
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if optval == '""':
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optval = ''
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cursect[optname] = [optval]
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else:
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# valueless option handling
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cursect[optname] = optval
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else:
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# a non-fatal parsing error occurred. set up the
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# exception but keep going. the exception will be
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# raised at the end of the file and will contain a
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# list of all bogus lines
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e = self._handle_error(e, fpname, lineno, line)
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# if any parsing errors occurred, raise an exception
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if e:
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raise e
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self._join_multiline_values()
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def _join_multiline_values(self):
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all_sections = [self._defaults]
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all_sections.extend(self._sections.values())
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for options in all_sections:
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for name, val in options.items():
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if isinstance(val, list):
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if val[-1] == '\n':
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val = val[:-1]
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options[name] = '\n'.join(val)
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def _handle_error(self, exc, fpname, lineno, line):
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if not exc:
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exc = ParsingError(fpname)
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exc.append(lineno, repr(line))
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return exc
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class ConfigParser(RawConfigParser):
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"""ConfigParser implementing interpolation."""
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def get(self, section, option, raw=False, vars=None):
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"""Get an option value for a given section.
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All % interpolations are expanded in the return values, based on the
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defaults passed into the constructor, unless the optional argument
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`raw' is true. Additional substitutions may be provided using the
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`vars' argument, which must be a dictionary whose contents overrides
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any pre-existing defaults.
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The section DEFAULT is special.
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"""
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d = self._defaults.copy()
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try:
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d.update(self._sections[section])
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except KeyError:
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if section != DEFAULTSECT:
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raise NoSectionError(section)
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# Update with the entry specific variables
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if vars:
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for key, value in vars.items():
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d[self.optionxform(key)] = value
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option = self.optionxform(option)
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try:
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value = d[option]
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except KeyError:
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raise NoOptionError(option, section)
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if raw or value is None:
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return value
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else:
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return self._interpolate(section, option, value, d)
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def items(self, section, raw=False, vars=None):
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"""Return a list of tuples with (name, value) for each option
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in the section.
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All % interpolations are expanded in the return values, based on the
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defaults passed into the constructor, unless the optional argument
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`raw' is true. Additional substitutions may be provided using the
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`vars' argument, which must be a dictionary whose contents overrides
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any pre-existing defaults.
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The section DEFAULT is special.
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"""
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d = self._defaults.copy()
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try:
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d.update(self._sections[section])
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except KeyError:
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if section != DEFAULTSECT:
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raise NoSectionError(section)
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# Update with the entry specific variables
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if vars:
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for key, value in vars.items():
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d[self.optionxform(key)] = value
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options = list(d.keys())
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if "__name__" in options:
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options.remove("__name__")
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if raw:
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return [(option, d[option])
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for option in options]
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else:
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return [(option, self._interpolate(section, option, d[option], d))
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for option in options]
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def _interpolate(self, section, option, rawval, vars):
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# do the string interpolation
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value = rawval
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depth = MAX_INTERPOLATION_DEPTH
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while depth: # Loop through this until it's done
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depth -= 1
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if value and "%(" in value:
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value = self._KEYCRE.sub(self._interpolation_replace, value)
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try:
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value = value % vars
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except KeyError as e:
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raise InterpolationMissingOptionError(
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option, section, rawval, e.args[0])
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else:
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break
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if value and "%(" in value:
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raise InterpolationDepthError(option, section, rawval)
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return value
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_KEYCRE = re.compile(r"%\(([^)]*)\)s|.")
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def _interpolation_replace(self, match):
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s = match.group(1)
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if s is None:
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return match.group()
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else:
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return "%%(%s)s" % self.optionxform(s)
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class SafeConfigParser(ConfigParser):
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"""ConfigParser implementing sane interpolation."""
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def _interpolate(self, section, option, rawval, vars):
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# do the string interpolation
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L = []
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self._interpolate_some(option, L, rawval, section, vars, 1)
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return ''.join(L)
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_interpvar_re = re.compile(r"%\(([^)]+)\)s")
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def _interpolate_some(self, option, accum, rest, section, map, depth):
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if depth > MAX_INTERPOLATION_DEPTH:
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raise InterpolationDepthError(option, section, rest)
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while rest:
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p = rest.find("%")
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if p < 0:
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accum.append(rest)
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return
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if p > 0:
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accum.append(rest[:p])
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rest = rest[p:]
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# p is no longer used
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c = rest[1:2]
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if c == "%":
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accum.append("%")
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rest = rest[2:]
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elif c == "(":
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m = self._interpvar_re.match(rest)
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if m is None:
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raise InterpolationSyntaxError(option, section,
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"bad interpolation variable reference %r" % rest)
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var = self.optionxform(m.group(1))
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rest = rest[m.end():]
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try:
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v = map[var]
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except KeyError:
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raise InterpolationMissingOptionError(
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option, section, rest, var)
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if "%" in v:
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self._interpolate_some(option, accum, v,
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section, map, depth + 1)
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else:
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accum.append(v)
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else:
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raise InterpolationSyntaxError(
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option, section,
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"'%%' must be followed by '%%' or '(', found: %r" % (rest,))
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def set(self, section, option, value=None):
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"""Set an option. Extend ConfigParser.set: check for string values."""
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# The only legal non-string value if we allow valueless
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# options is None, so we need to check if the value is a
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# string if:
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# - we do not allow valueless options, or
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# - we allow valueless options but the value is not None
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if self._optcre is self.OPTCRE or value:
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if not isinstance(value, str):
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raise TypeError("option values must be strings")
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# check for bad percent signs:
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# first, replace all "good" interpolations
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tmp_value = value.replace('%%', '')
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tmp_value = self._interpvar_re.sub('', tmp_value)
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# then, check if there's a lone percent sign left
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percent_index = tmp_value.find('%')
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if percent_index != -1:
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raise ValueError("invalid interpolation syntax in %r at "
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"position %d" % (value, percent_index))
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ConfigParser.set(self, section, option, value)
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