root/configobj.py

# configobj.py
# A config file reader/writer that supports nested sections in config files.
# Copyright (C) 2005 Michael Foord, Nicola Larosa
# E-mail: fuzzyman AT voidspace DOT org DOT uk
#         nico AT tekNico DOT net

# ConfigObj 4

# Released subject to the BSD License
# Please see http://www.voidspace.org.uk/documents/BSD-LICENSE.txt

# Scripts maintained at http://www.voidspace.org.uk/python/index.shtml
# For information about bugfixes, updates and support, please join the
# ConfigObj mailing list:
# http://lists.sourceforge.net/lists/listinfo/configobj-develop
# Comments, suggestions and bug reports welcome.

"""
    >>> z = ConfigObj()
    >>> z['a'] = 'a'
    >>> z['sect'] = {
    ...    'subsect': {
    ...         'a': 'fish',
    ...         'b': 'wobble',
    ...     },
    ...     'member': 'value',
    ... }
    >>> x = ConfigObj(z.write())
    >>> z == x
    1
"""

import sys
INTP_VER = sys.version_info[:2]
if INTP_VER < (2, 2):
    raise RuntimeError("Python v.2.2 or later needed")

import os, re
from types import StringTypes

# the UTF8 BOM - from codecs module
BOM_UTF8 = '\xef\xbb\xbf'

__version__ = '4.0.0beta5'

__revision__ = '$Id: configobj.py 126 2005-09-12 08:09:40Z fuzzyman $'

__docformat__ = "restructuredtext en"

__all__ = (
    '__version__',
    'BOM_UTF8',
    'DEFAULT_INDENT_TYPE',
    'NUM_INDENT_SPACES',
    'MAX_INTERPOL_DEPTH',
    'ConfigObjError',
    'NestingError',
    'ParseError',
    'DuplicateError',
    'ConfigspecError',
    'ConfigObj',
    'SimpleVal',
    'InterpolationError',
    'InterpolationDepthError',
    'MissingInterpolationOption',
    'RepeatSectionError',
    '__docformat__',
)

DEFAULT_INDENT_TYPE = ' '
NUM_INDENT_SPACES = 4
MAX_INTERPOL_DEPTH = 10

OPTION_DEFAULTS = {
    'interpolation': True,
    'raise_errors': False,
    'list_values': True,
    'create_empty': False,
    'file_error': False,
    'configspec': None,
    'stringify': True,
    # option may be set to one of ('', ' ', '\t')
    'indent_type': None,
}

class ConfigObjError(SyntaxError):
    """
    This is the base class for all errors that ConfigObj raises.
    It is a subclass of SyntaxError.
    
    >>> raise ConfigObjError
    Traceback (most recent call last):
    ConfigObjError
    """
    def __init__(self, message='', line_number=None, line=''):
        self.line = line
        self.line_number = line_number
        self.message = message
        SyntaxError.__init__(self, message)

class NestingError(ConfigObjError):
    """
    This error indicates a level of nesting that doesn't match.
    
    >>> raise NestingError
    Traceback (most recent call last):
    NestingError
    """

class ParseError(ConfigObjError):
    """
    This error indicates that a line is badly written.
    It is neither a valid ``key = value`` line,
    nor a valid section marker line.
    
    >>> raise ParseError
    Traceback (most recent call last):
    ParseError
    """

class DuplicateError(ConfigObjError):
    """
    The keyword or section specified already exists.
    
    >>> raise DuplicateError
    Traceback (most recent call last):
    DuplicateError
    """

class ConfigspecError(ConfigObjError):
    """
    An error occured whilst parsing a configspec.
    
    >>> raise ConfigspecError
    Traceback (most recent call last):
    ConfigspecError
    """

class InterpolationError(ConfigObjError):
    """Base class for the two interpolation errors."""

class InterpolationDepthError(InterpolationError):
    """Maximum interpolation depth exceeded in string interpolation."""

    def __init__(self, option):
        """
        >>> raise InterpolationDepthError('yoda')
        Traceback (most recent call last):
        InterpolationDepthError: max interpolation depth exceeded in value "yoda".
        """
        InterpolationError.__init__(
            self,
            'max interpolation depth exceeded in value "%s".' % option)

class RepeatSectionError(ConfigObjError):
    """
    This error indicates additional sections in a section with a
    ``__many__`` (repeated) section.
    
    >>> raise RepeatSectionError
    Traceback (most recent call last):
    RepeatSectionError
    """

class MissingInterpolationOption(InterpolationError):
    """A value specified for interpolation was missing."""

    def __init__(self, option):
        """
        >>> raise MissingInterpolationOption('yoda')
        Traceback (most recent call last):
        MissingInterpolationOption: missing option "yoda" in interpolation.
        """
        InterpolationError.__init__(
            self,
            'missing option "%s" in interpolation.' % option)

class Section(dict):
    """
    A dictionary-like object that represents a section in a config file.
    
    It does string interpolation if the 'interpolate' attribute
    of the 'main' object is set to True.
    
    Interpolation is tried first from the 'DEFAULT' section of this object,
    next from the 'DEFAULT' section of the parent, lastly the main object.
    
    A Section will behave like an ordered dictionary - following the
    order of the ``scalars`` and ``sections`` attributes.
    You can use this to change the order of members.
    
    Iteration follows the order: scalars, then sections.
    """

    _KEYCRE = re.compile(r"%\(([^)]*)\)s|.")

    def __init__(self, parent, depth, main, indict=None, name=None):
        """
        parent is the section above
        depth is the depth level of this section
        main is the main ConfigObj
        indict is a dictionary to initialise the section with
        """
        if indict is None:
            indict = {}
        dict.__init__(self)
        # used for nesting level *and* interpolation
        self.parent = parent
        # used for the interpolation attribute
        self.main = main
        # level of nesting depth of this Section
        self.depth = depth
        # the sequence of scalar values in this Section
        self.scalars = []
        # the sequence of sections in this Section
        self.sections = []
        # purely for information
        self.name = name
        # for comments :-)
        self.comments = {}
        self.inline_comments = {}
        # for the configspec
        self.configspec = {}
        # for defaults
        self.defaults = []
        #
        # we do this explicitly so that __setitem__ is used properly
        # (rather than just passing to ``dict.__init__``)
        for entry in indict:
            self[entry] = indict[entry]

    def _interpolate(self, value):
        """Nicked from ConfigParser."""
        depth = MAX_INTERPOL_DEPTH
        # loop through this until it's done
        while depth:
            depth -= 1
            if value.find("%(") != -1:
                value = self._KEYCRE.sub(self._interpolation_replace, value)
            else:
                break
        else:
            raise InterpolationDepthError(value)
        return value

    def _interpolation_replace(self, match):
        """ """
        s = match.group(1)
        if s is None:
            return match.group()
        else:
            # switch off interpolation before we try and fetch anything !
            self.main.interpolation = False
            # try the 'DEFAULT' member of *this section* first
            val = self.get('DEFAULT', {}).get(s)
            # try the 'DEFAULT' member of the *parent section* next
            if val is None:
                val = self.parent.get('DEFAULT', {}).get(s)
            # last, try the 'DEFAULT' member of the *main section*
            if val is None:
                val = self.main.get('DEFAULT', {}).get(s)
            self.main.interpolation = True
            if val is None:
                raise MissingInterpolationOption(s)
            return val

    def __getitem__(self, key):
        """Fetch the item and do string interpolation."""
        val = dict.__getitem__(self, key)
        if self.main.interpolation and isinstance(val, StringTypes):
            return self._interpolate(val)
        return val

    def __setitem__(self, key, value):
        """
        Correctly set a value.
        
        Making dictionary values Section instances.
        (We have to special case 'Section' instances - which are also dicts)
        
        Keys must be strings.
        Values need only be strings (or lists of strings) if
        ``main.stringify`` is set.
        """
        if not isinstance(key, StringTypes):
            raise ValueError, 'The key "%s" is not a string.' % key
##        if self.depth is None:
##            self.depth = 0
        # add the comment
        if not self.comments.has_key(key):
            self.comments[key] = []
            self.inline_comments[key] = ''
        # remove the entry from defaults
        if key in self.defaults:
            self.defaults.remove(key)
        #
        if isinstance(value, Section):
            if not self.has_key(key):
                self.sections.append(key)
            dict.__setitem__(self, key, value)
        elif isinstance(value, dict):
            # First create the new depth level,
            # then create the section
            if not self.has_key(key):
                self.sections.append(key)
            new_depth = self.depth + 1
            dict.__setitem__(
                self,
                key,
                Section(
                    self,
                    new_depth,
                    self.main,
                    indict=value,
                    name=key))
        else:
            if not self.has_key(key):
                self.scalars.append(key)
            if not self.main.stringify:
                if isinstance(value, StringTypes):
                    pass
                elif isinstance(value, (list, tuple)):
                    for entry in value:
                        if not isinstance(entry, StringTypes):
                            raise TypeError, (
                                'Value is not a string "%s".' % entry)
                else:
                    raise TypeError, 'Value is not a string "%s".' % value
            dict.__setitem__(self, key, value)

    def __delitem__(self, key):
        """Remove items from the sequence when deleting."""
        dict. __delitem__(self, key)
        if key in self.scalars:
            self.scalars.remove(key)
        else:
            self.sections.remove(key)
        del self.comments[key]
        del self.inline_comments[key]

    def get(self, key, default=None):
        """A version of ``get`` that doesn't bypass string interpolation."""
        try:
            return self[key]
        except KeyError:
            return default

    def update(self, indict):
        """A version of update that uses our ``__setitem__``."""
        for entry in indict:
            self[entry] = indict[entry]

    def pop(self, key, *args):
        """ """
        val = dict.pop(self, key, *args)
        if key in self.scalars:
            del self.comments[key]
            del self.inline_comments[key]
            self.scalars.remove(key)
        elif key in self.sections:
            del self.comments[key]
            del self.inline_comments[key]
            self.sections.remove(key)
        if self.main.interpolation and isinstance(val, StringTypes):
            return self._interpolate(val)
        return val

    def popitem(self):
        """Pops the first (key,val)"""
        sequence = (self.scalars + self.sections)
        if not sequence:
            raise KeyError, ": 'popitem(): dictionary is empty'"
        key = sequence[0]
        val =  self[key]
        del self[key]
        return key, val

    def clear(self):
        """
        A version of clear that also affects scalars/sections
        Also clears comments and configspec.
        
        Leaves other attributes alone :
            depth/main/parent are not affected
        """
        dict.clear(self)
        self.scalars = []
        self.sections = []
        self.comments = {}
        self.inline_comments = {}
        self.configspec = {}

    def setdefault(self, key, default=None):
        """A version of setdefault that sets sequence if appropriate."""
        try:
            return self[key]
        except KeyError:
            self[key] = default
            return default

    def items(self):
        """ """
        return zip((self.scalars + self.sections), self.values())

    def keys(self):
        """ """
        return (self.scalars + self.sections)

    def values(self):
        """ """
        return [self[key] for key in (self.scalars + self.sections)]

    def iteritems(self):
        """ """
        return iter(self.items())

    def iterkeys(self):
        """ """
        return iter((self.scalars + self.sections))

    __iter__ = iterkeys

    def itervalues(self):
        """ """
        return iter(self.values())

    def __repr__(self):
        return '{%s}' % ', '.join([('%s: %s' % (repr(key), repr(self[key])))
            for key in (self.scalars + self.sections)])

    __str__ = __repr__

    # Extra methods - not in a normal dictionary

    def dict(self):
        """
        Return a deepcopy of self as a dictionary.
        
        All members that are ``Section`` instances are recursively turned to
        ordinary dictionaries - by calling their ``dict`` method.
        
        >>> n = a.dict()
        >>> n == a
        1
        >>> n is a
        0
        """
        newdict = {}
        for entry in self:
            this_entry = self[entry]
            if isinstance(this_entry, Section):
                this_entry = this_entry.dict()
            elif isinstance(this_entry, (list, tuple)):
                # create a copy rather than a reference
                this_entry = list(this_entry)
            newdict[entry] = this_entry
        return newdict

    def rename(self, oldkey, newkey):
        """
        Change a keyname to another, without changing position in sequence.
        
        Implemented so that transformations can be made on keys,
        as well as on values. (used by encode and decode)
        
        Also renames comments.
        """
        if oldkey in self.scalars:
            the_list = self.scalars
        elif oldkey in self.sections:
            the_list = self.sections
        else:
            raise KeyError, 'Key "%s" not found.' % oldkey
        pos = the_list.index(oldkey)
        #
        val = self[oldkey]
        dict.__delitem__(self, oldkey)
        dict.__setitem__(self, newkey, val)
        the_list.remove(oldkey)
        the_list.insert(pos, newkey)
        comm = self.comments[oldkey]
        inline_comment = self.inline_comments[oldkey]
        del self.comments[oldkey]
        del self.inline_comments[oldkey]
        self.comments[newkey] = comm
        self.inline_comments[newkey] = inline_comment

    def walk(self, function, raise_errors=True,
            call_on_sections=False, **keywargs):
        """
        Walk every member and call a function on the keyword and value.
        
        Return a dictionary of the return values
        
        If the function raises an exception, raise the errror
        unless ``raise_errors=False``, in which case set the return value to
        ``False``.
        
        Any unrecognised keyword arguments you pass to walk, will be pased on
        to the function you pass in.
        
        Note: if ``call_on_sections`` is ``True`` then - on encountering a
        subsection, *first* the function is called for the *whole* subsection,
        and then recurses into it's members. This means your function must be
        able to handle strings, dictionaries and lists. This allows you
        to change the key of subsections as well as for ordinary members. The
        return value when called on the whole subsection has to be discarded.
        
        See  the encode and decode methods for examples, including functions.
        """
        out = {}
        # scalars first
        for entry in self.scalars[:]:
            try:
                out[entry] = function(self, entry, **keywargs)
            except Exception:
                if raise_errors:
                    raise
                else:
                    out[entry] = False
        # then sections
        for entry in self.sections[:]:
            if call_on_sections:
                try:
                    function(self, entry, **keywargs)
                except Exception:
                    if raise_errors:
                        raise
                    else:
                        out[entry] = False
            # previous result is discarded
            out[entry] = self[entry].walk(
                function,
                raise_errors=raise_errors,
                call_on_sections=call_on_sections,
                **keywargs)
        return out

    def decode(self, encoding):
        """
        Decode all strings and values to unicode, using the specified encoding.
        
        Works with subsections and list values.
        
        Uses the ``walk`` method.
        
        Testing ``encode`` and ``decode``.
        >>> m = ConfigObj(a)
        >>> m.decode('ascii')
        >>> def testuni(val):
        ...     for entry in val:
        ...         if not isinstance(entry, unicode):
        ...             print >> sys.stderr, type(entry)
        ...             raise AssertionError, 'decode failed.'
        ...         if isinstance(val[entry], dict):
        ...             testuni(val[entry])
        ...         elif not isinstance(val[entry], unicode):
        ...             raise AssertionError, 'decode failed.'
        >>> testuni(m)
        >>> m.encode('ascii')
        >>> a == m
        1
        """
        def decode(section, key, encoding=encoding):
            """ """
            val = section[key]
            if isinstance(val, (list, tuple)):
                newval = []
                for entry in val:
                    newval.append(entry.decode(encoding))
            elif isinstance(val, dict):
                newval = val
            else:
                newval = val.decode(encoding)
            newkey = key.decode(encoding)
            section.rename(key, newkey)
            section[newkey] = newval
        # using ``call_on_sections`` allows us to modify section names
        self.walk(decode, call_on_sections=True)

    def encode(self, encoding):
        """
        Encode all strings and values from unicode,
        using the specified encoding.
        
        Works with subsections and list values.
        Uses the ``walk`` method.
        """
        def encode(section, key, encoding=encoding):
            """ """
            val = section[key]
            if isinstance(val, (list, tuple)):
                newval = []
                for entry in val:
                    newval.append(entry.encode(encoding))
            elif isinstance(val, dict):
                newval = val
            else:
                newval = val.encode(encoding)
            newkey = key.encode(encoding)
            section.rename(key, newkey)
            section[newkey] = newval
        self.walk(encode, call_on_sections=True)

class ConfigObj(Section):
    """
    An object to read, create, and write config files.
    
    Testing with duplicate keys and sections.
    
    >>> c = '''
    ... [hello]
    ... member = value
    ... [hello again]
    ... member = value
    ... [ "hello" ]
    ... member = value
    ... '''
    >>> ConfigObj(c.split('\\n'), raise_errors = True)
    Traceback (most recent call last):
    DuplicateError: Duplicate section name at line 5.
    
    >>> d = '''
    ... [hello]
    ... member = value
    ... [hello again]
    ... member1 = value
    ... member2 = value
    ... 'member1' = value
    ... [ "and again" ]
    ... member = value
    ... '''
    >>> ConfigObj(d.split('\\n'), raise_errors = True)
    Traceback (most recent call last):
    DuplicateError: Duplicate keyword name at line 6.
    """

    _keyword = re.compile(r'''^ # line start
        (\s*)                   # indentation
        (                       # keyword
            (?:".*?")|          # double quotes
            (?:'.*?')|          # single quotes
            (?:[^'"=].*?)       # no quotes
        )
        \s*=\s*                 # divider
        (.*)                    # value (including list values and comments)
        $   # line end
        ''',
        re.VERBOSE)

    _sectionmarker = re.compile(r'''^
        (\s*)                     # 1: indentation
        ((?:\[\s*)+)              # 2: section marker open
        (                         # 3: section name open
            (?:"\s*\S.*?\s*")|    # at least one non-space with double quotes
            (?:'\s*\S.*?\s*')|    # at least one non-space with single quotes
            (?:[^'"\s].*?)        # at least one non-space unquoted
        )                         # section name close
        ((?:\s*\])+)              # 4: section marker close
        \s*(\#.*)?                # 5: optional comment
        $''',
        re.VERBOSE)

    # this regexp pulls list values out as a single string
    # or single values and comments
    _valueexp = re.compile(r'''^
        (?:
            (?:
                (
                    (?:
                        (?:
                            (?:".*?")|              # double quotes
                            (?:'.*?')|              # single quotes
                            (?:[^'",\#][^,\#]*?)       # unquoted
                        )
                        \s*,\s*                     # comma
                    )*      # match all list items ending in a comma (if any)
                )
                (
                    (?:".*?")|                      # double quotes
                    (?:'.*?')|                      # single quotes
                    (?:[^'",\#\s][^,]*?)             # unquoted
                )?          # last item in a list - or string value
            )|
            (,)             # alternatively a single comma - empty list
        )
        \s*(\#.*)?          # optional comment
        $''',
        re.VERBOSE)

    # use findall to get the members of a list value
    _listvalueexp = re.compile(r'''
        (
            (?:".*?")|          # double quotes
            (?:'.*?')|          # single quotes
            (?:[^'",\#].*?)       # unquoted
        )
        \s*,\s*                 # comma
        ''',
        re.VERBOSE)

    # this regexp is used for the value
    # when lists are switched off
    _nolistvalue = re.compile(r'''^
        (
            (?:".*?")|          # double quotes
            (?:'.*?')|          # single quotes
            (?:[^'"\#].*?)      # unquoted
        )
        \s*(\#.*)?              # optional comment
        $''',
        re.VERBOSE)

    # regexes for finding triple quoted values on one line
    _single_line_single = re.compile(r"^'''(.*?)'''\s*(#.*)?$")
    _single_line_double = re.compile(r'^"""(.*?)"""\s*(#.*)?$')
    _multi_line_single = re.compile(r"^(.*?)'''\s*(#.*)?$")
    _multi_line_double = re.compile(r'^(.*?)"""\s*(#.*)?$')

    _triple_quote = {
        "'''": (_single_line_single, _multi_line_single),
        '"""': (_single_line_double, _multi_line_double),
    }

    def __init__(self, infile=None, options=None, **kwargs):
        """
        Parse or create a config file object.
        
        ``ConfigObj(infile=None, options=None, **kwargs)``
        """
        if infile is None:
            infile = []
        if options is None:
            options = {}
        # keyword arguments take precedence over an options dictionary
        options.update(kwargs)
        # init the superclass
        Section.__init__(self, self, 0, self)
        #
        defaults = OPTION_DEFAULTS.copy()
        for entry in options.keys():
            if entry not in defaults.keys():
                raise TypeError, 'Unrecognised option "%s".' % entry
        # TODO: check the values too
        # add the explicit options to the defaults
        defaults.update(options)
        #
        # initialise a few variables
        self._errors = []
        self.raise_errors = defaults['raise_errors']
        self.interpolation = defaults['interpolation']
        self.list_values = defaults['list_values']
        self.create_empty = defaults['create_empty']
        self.file_error = defaults['file_error']
        self.stringify = defaults['stringify']
        self.indent_type = defaults['indent_type']
        # used by the write method
        self.BOM = None
        #
        self.initial_comment = []
        self.final_comment = []
        #
        if isinstance(infile, StringTypes):
            self.filename = os.path.abspath(infile)
            if os.path.isfile(self.filename):
                infile = open(self.filename).readlines()
            elif self.file_error:
                # raise an error if the file doesn't exist
                raise IOError, 'Config file not found: "%s".' % self.filename
            else:
                # file doesn't already exist
                if self.create_empty:
                    # this is a good test that the filename specified
                    # isn't impossible - like on a non existent device
                    h = open(self.filename,'w')
                    h.write('')
                    h.close()
                infile = []
        elif isinstance(infile, (list, tuple)):
            self.filename = None
        elif isinstance(infile, dict):
            # initialise self
            # the Section class handles creating subsections
            if isinstance(infile, ConfigObj):
                # get a copy of our ConfigObj
                infile = infile.dict()
            for entry in infile:
                self[entry] = infile[entry]
            self.filename = None
            del self._errors
            if defaults['configspec'] is not None:
                self._handle_configspec(defaults['configspec'])
            else:
                self.configspec = None
            return
        elif hasattr(infile, 'seek'):
            # this supports StringIO instances and even file objects
            self.filename = infile
            infile.seek(0)
            infile = infile.readlines()
            self.filename.seek(0)
        else:
            raise TypeError, ('infile must be a filename,'
                ' StringIO instance, or a file as a list.')
        #
        # strip trailing '\n' from lines
        infile = [line.rstrip(