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Diffstat (limited to 'python/cdec/configobj.py')
| -rw-r--r-- | python/cdec/configobj.py | 2468 |
1 files changed, 2468 insertions, 0 deletions
diff --git a/python/cdec/configobj.py b/python/cdec/configobj.py new file mode 100644 index 00000000..c1f6e6df --- /dev/null +++ b/python/cdec/configobj.py @@ -0,0 +1,2468 @@ +# configobj.py +# A config file reader/writer that supports nested sections in config files. +# Copyright (C) 2005-2010 Michael Foord, Nicola Larosa +# E-mail: fuzzyman AT voidspace DOT org DOT uk +# nico AT tekNico DOT net + +# ConfigObj 4 +# http://www.voidspace.org.uk/python/configobj.html + +# Released subject to the BSD License +# Please see http://www.voidspace.org.uk/python/license.shtml + +# 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. + +from __future__ import generators + +import os +import re +import sys + +from codecs import BOM_UTF8, BOM_UTF16, BOM_UTF16_BE, BOM_UTF16_LE + + +# imported lazily to avoid startup performance hit if it isn't used +compiler = None + +# A dictionary mapping BOM to +# the encoding to decode with, and what to set the +# encoding attribute to. +BOMS = { + BOM_UTF8: ('utf_8', None), + BOM_UTF16_BE: ('utf16_be', 'utf_16'), + BOM_UTF16_LE: ('utf16_le', 'utf_16'), + BOM_UTF16: ('utf_16', 'utf_16'), + } +# All legal variants of the BOM codecs. +# TODO: the list of aliases is not meant to be exhaustive, is there a +# better way ? +BOM_LIST = { + 'utf_16': 'utf_16', + 'u16': 'utf_16', + 'utf16': 'utf_16', + 'utf-16': 'utf_16', + 'utf16_be': 'utf16_be', + 'utf_16_be': 'utf16_be', + 'utf-16be': 'utf16_be', + 'utf16_le': 'utf16_le', + 'utf_16_le': 'utf16_le', + 'utf-16le': 'utf16_le', + 'utf_8': 'utf_8', + 'u8': 'utf_8', + 'utf': 'utf_8', + 'utf8': 'utf_8', + 'utf-8': 'utf_8', + } + +# Map of encodings to the BOM to write. +BOM_SET = { + 'utf_8': BOM_UTF8, + 'utf_16': BOM_UTF16, + 'utf16_be': BOM_UTF16_BE, + 'utf16_le': BOM_UTF16_LE, + None: BOM_UTF8 + } + + +def match_utf8(encoding): + return BOM_LIST.get(encoding.lower()) == 'utf_8' + + +# Quote strings used for writing values +squot = "'%s'" +dquot = '"%s"' +noquot = "%s" +wspace_plus = ' \r\n\v\t\'"' +tsquot = '"""%s"""' +tdquot = "'''%s'''" + +# Sentinel for use in getattr calls to replace hasattr +MISSING = object() + +__version__ = '4.7.2' + +try: + any +except NameError: + def any(iterable): + for entry in iterable: + if entry: + return True + return False + + +__all__ = ( + '__version__', + 'DEFAULT_INDENT_TYPE', + 'DEFAULT_INTERPOLATION', + 'ConfigObjError', + 'NestingError', + 'ParseError', + 'DuplicateError', + 'ConfigspecError', + 'ConfigObj', + 'SimpleVal', + 'InterpolationError', + 'InterpolationLoopError', + 'MissingInterpolationOption', + 'RepeatSectionError', + 'ReloadError', + 'UnreprError', + 'UnknownType', + 'flatten_errors', + 'get_extra_values' +) + +DEFAULT_INTERPOLATION = 'configparser' +DEFAULT_INDENT_TYPE = ' ' +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, + 'encoding': None, + 'default_encoding': None, + 'unrepr': False, + 'write_empty_values': False, +} + + + +def getObj(s): + global compiler + if compiler is None: + import compiler + s = "a=" + s + p = compiler.parse(s) + return p.getChildren()[1].getChildren()[0].getChildren()[1] + + +class UnknownType(Exception): + pass + + +class Builder(object): + + def build(self, o): + m = getattr(self, 'build_' + o.__class__.__name__, None) + if m is None: + raise UnknownType(o.__class__.__name__) + return m(o) + + def build_List(self, o): + return map(self.build, o.getChildren()) + + def build_Const(self, o): + return o.value + + def build_Dict(self, o): + d = {} + i = iter(map(self.build, o.getChildren())) + for el in i: + d[el] = i.next() + return d + + def build_Tuple(self, o): + return tuple(self.build_List(o)) + + def build_Name(self, o): + if o.name == 'None': + return None + if o.name == 'True': + return True + if o.name == 'False': + return False + + # An undefined Name + raise UnknownType('Undefined Name') + + def build_Add(self, o): + real, imag = map(self.build_Const, o.getChildren()) + try: + real = float(real) + except TypeError: + raise UnknownType('Add') + if not isinstance(imag, complex) or imag.real != 0.0: + raise UnknownType('Add') + return real+imag + + def build_Getattr(self, o): + parent = self.build(o.expr) + return getattr(parent, o.attrname) + + def build_UnarySub(self, o): + return -self.build_Const(o.getChildren()[0]) + + def build_UnaryAdd(self, o): + return self.build_Const(o.getChildren()[0]) + + +_builder = Builder() + + +def unrepr(s): + if not s: + return s + return _builder.build(getObj(s)) + + + +class ConfigObjError(SyntaxError): + """ + This is the base class for all errors that ConfigObj raises. + It is a subclass of SyntaxError. + """ + def __init__(self, message='', line_number=None, line=''): + self.line = line + self.line_number = line_number + SyntaxError.__init__(self, message) + + +class NestingError(ConfigObjError): + """ + This error indicates a level of nesting that doesn't match. + """ + + +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. + """ + + +class ReloadError(IOError): + """ + A 'reload' operation failed. + This exception is a subclass of ``IOError``. + """ + def __init__(self): + IOError.__init__(self, 'reload failed, filename is not set.') + + +class DuplicateError(ConfigObjError): + """ + The keyword or section specified already exists. + """ + + +class ConfigspecError(ConfigObjError): + """ + An error occured whilst parsing a configspec. + """ + + +class InterpolationError(ConfigObjError): + """Base class for the two interpolation errors.""" + + +class InterpolationLoopError(InterpolationError): + """Maximum interpolation depth exceeded in string interpolation.""" + + def __init__(self, option): + InterpolationError.__init__( + self, + 'interpolation loop detected in value "%s".' % option) + + +class RepeatSectionError(ConfigObjError): + """ + This error indicates additional sections in a section with a + ``__many__`` (repeated) section. + """ + + +class MissingInterpolationOption(InterpolationError): + """A value specified for interpolation was missing.""" + def __init__(self, option): + msg = 'missing option "%s" in interpolation.' % option + InterpolationError.__init__(self, msg) + + +class UnreprError(ConfigObjError): + """An error parsing in unrepr mode.""" + + + +class InterpolationEngine(object): + """ + A helper class to help perform string interpolation. + + This class is an abstract base class; its descendants perform + the actual work. + """ + + # compiled regexp to use in self.interpolate() + _KEYCRE = re.compile(r"%\(([^)]*)\)s") + _cookie = '%' + + def __init__(self, section): + # the Section instance that "owns" this engine + self.section = section + + + def interpolate(self, key, value): + # short-cut + if not self._cookie in value: + return value + + def recursive_interpolate(key, value, section, backtrail): + """The function that does the actual work. + + ``value``: the string we're trying to interpolate. + ``section``: the section in which that string was found + ``backtrail``: a dict to keep track of where we've been, + to detect and prevent infinite recursion loops + + This is similar to a depth-first-search algorithm. + """ + # Have we been here already? + if (key, section.name) in backtrail: + # Yes - infinite loop detected + raise InterpolationLoopError(key) + # Place a marker on our backtrail so we won't come back here again + backtrail[(key, section.name)] = 1 + + # Now start the actual work + match = self._KEYCRE.search(value) + while match: + # The actual parsing of the match is implementation-dependent, + # so delegate to our helper function + k, v, s = self._parse_match(match) + if k is None: + # That's the signal that no further interpolation is needed + replacement = v + else: + # Further interpolation may be needed to obtain final value + replacement = recursive_interpolate(k, v, s, backtrail) + # Replace the matched string with its final value + start, end = match.span() + value = ''.join((value[:start], replacement, value[end:])) + new_search_start = start + len(replacement) + # Pick up the next interpolation key, if any, for next time + # through the while loop + match = self._KEYCRE.search(value, new_search_start) + + # Now safe to come back here again; remove marker from backtrail + del backtrail[(key, section.name)] + + return value + + # Back in interpolate(), all we have to do is kick off the recursive + # function with appropriate starting values + value = recursive_interpolate(key, value, self.section, {}) + return value + + + def _fetch(self, key): + """Helper function to fetch values from owning section. + + Returns a 2-tuple: the value, and the section where it was found. + """ + # switch off interpolation before we try and fetch anything ! + save_interp = self.section.main.interpolation + self.section.main.interpolation = False + + # Start at section that "owns" this InterpolationEngine + current_section = self.section + while True: + # try the current section first + val = current_section.get(key) + if val is not None and not isinstance(val, Section): + break + # try "DEFAULT" next + val = current_section.get('DEFAULT', {}).get(key) + if val is not None and not isinstance(val, Section): + break + # move up to parent and try again + # top-level's parent is itself + if current_section.parent is current_section: + # reached top level, time to give up + break + current_section = current_section.parent + + # restore interpolation to previous value before returning + self.section.main.interpolation = save_interp + if val is None: + raise MissingInterpolationOption(key) + return val, current_section + + + def _parse_match(self, match): + """Implementation-dependent helper function. + + Will be passed a match object corresponding to the interpolation + key we just found (e.g., "%(foo)s" or "$foo"). Should look up that + key in the appropriate config file section (using the ``_fetch()`` + helper function) and return a 3-tuple: (key, value, section) + + ``key`` is the name of the key we're looking for + ``value`` is the value found for that key + ``section`` is a reference to the section where it was found + + ``key`` and ``section`` should be None if no further + interpolation should be performed on the resulting value + (e.g., if we interpolated "$$" and returned "$"). + """ + raise NotImplementedError() + + + +class ConfigParserInterpolation(InterpolationEngine): + """Behaves like ConfigParser.""" + _cookie = '%' + _KEYCRE = re.compile(r"%\(([^)]*)\)s") + + def _parse_match(self, match): + key = match.group(1) + value, section = self._fetch(key) + return key, value, section + + + +class TemplateInterpolation(InterpolationEngine): + """Behaves like string.Template.""" + _cookie = '$' + _delimiter = '$' + _KEYCRE = re.compile(r""" + \$(?: + (?P<escaped>\$) | # Two $ signs + (?P<named>[_a-z][_a-z0-9]*) | # $name format + {(?P<braced>[^}]*)} # ${name} format + ) + """, re.IGNORECASE | re.VERBOSE) + + def _parse_match(self, match): + # Valid name (in or out of braces): fetch value from section + key = match.group('named') or match.group('braced') + if key is not None: + value, section = self._fetch(key) + return key, value, section + # Escaped delimiter (e.g., $$): return single delimiter + if match.group('escaped') is not None: + # Return None for key and section to indicate it's time to stop + return None, self._delimiter, None + # Anything else: ignore completely, just return it unchanged + return None, match.group(), None + + +interpolation_engines = { + 'configparser': ConfigParserInterpolation, + 'template': TemplateInterpolation, +} + + +def __newobj__(cls, *args): + # Hack for pickle + return cls.__new__(cls, *args) + +class Section(dict): + """ + A dictionary-like object that represents a section in a config file. + + It does string interpolation if the 'interpolation' attribute + of the 'main' object is set to True. + + Interpolation is tried first from this object, then from the 'DEFAULT' + section of this object, next from the parent and its 'DEFAULT' section, + and so on until the main object is reached. + + 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. + """ + + + def __setstate__(self, state): + dict.update(self, state[0]) + self.__dict__.update(state[1]) + + def __reduce__(self): + state = (dict(self), self.__dict__) + return (__newobj__, (self.__class__,), state) + + + 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 + # purely for information + self.name = name + # + self._initialise() + # we do this explicitly so that __setitem__ is used properly + # (rather than just passing to ``dict.__init__``) + for entry, value in indict.iteritems(): + self[entry] = value + + + def _initialise(self): + # the sequence of scalar values in this Section + self.scalars = [] + # the sequence of sections in this Section + self.sections = [] + # for comments :-) + self.comments = {} + self.inline_comments = {} + # the configspec + self.configspec = None + # for defaults + self.defaults = [] + self.default_values = {} + self.extra_values = [] + self._created = False + + + def _interpolate(self, key, value): + try: + # do we already have an interpolation engine? + engine = self._interpolation_engine + except AttributeError: + # not yet: first time running _interpolate(), so pick the engine + name = self.main.interpolation + if name == True: # note that "if name:" would be incorrect here + # backwards-compatibility: interpolation=True means use default + name = DEFAULT_INTERPOLATION + name = name.lower() # so that "Template", "template", etc. all work + class_ = interpolation_engines.get(name, None) + if class_ is None: + # invalid value for self.main.interpolation + self.main.interpolation = False + return value + else: + # save reference to engine so we don't have to do this again + engine = self._interpolation_engine = class_(self) + # let the engine do the actual work + return engine.interpolate(key, value) + + + def __getitem__(self, key): + """Fetch the item and do string interpolation.""" + val = dict.__getitem__(self, key) + if self.main.interpolation: + if isinstance(val, basestring): + return self._interpolate(key, val) + if isinstance(val, list): + def _check(entry): + if isinstance(entry, basestring): + return self._interpolate(key, entry) + return entry + new = [_check(entry) for entry in val] + if new != val: + return new + return val + + + def __setitem__(self, key, value, unrepr=False): + """ + 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. + + ``unrepr`` must be set when setting a value to a dictionary, without + creating a new sub-section. + """ + if not isinstance(key, basestring): + raise ValueError('The key "%s" is not a string.' % key) + + # add the comment + if key not in self.comments: + 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 key not in self: + self.sections.append(key) + dict.__setitem__(self, key, value) + elif isinstance(value, dict) and not unrepr: + # First create the new depth level, + # then create the section + if key not in self: + 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 key not in self: + self.scalars.append(key) + if not self.main.stringify: + if isinstance(value, basestring): + pass + elif isinstance(value, (list, tuple)): + for entry in value: + if not isinstance(entry, basestring): + 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, default=MISSING): + """ + 'D.pop(k[,d]) -> v, remove specified key and return the corresponding value. + If key is not found, d is returned if given, otherwise KeyError is raised' + """ + try: + val = self[key] + except KeyError: + if default is MISSING: + raise + val = default + else: + del self[key] + 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 = None + self.defaults = [] + self.extra_values = [] + + + 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 self[key] + + + def items(self): + """D.items() -> list of D's (key, value) pairs, as 2-tuples""" + return zip((self.scalars + self.sections), self.values()) + + + def keys(self): + """D.keys() -> list of D's keys""" + return (self.scalars + self.sections) + + + def values(self): + """D.values() -> list of D's values""" + return [self[key] for key in (self.scalars + self.sections)] + + + def iteritems(self): + """D.iteritems() -> an iterator over the (key, value) items of D""" + return iter(self.items()) + + + def iterkeys(self): + """D.iterkeys() -> an iterator over the keys of D""" + return iter((self.scalars + self.sections)) + + __iter__ = iterkeys + + + def itervalues(self): + """D.itervalues() -> an iterator over the values of D""" + return iter(self.values()) + + + def __repr__(self): + """x.__repr__() <==> repr(x)""" + def _getval(key): + try: + return self[key] + except MissingInterpolationOption: + return dict.__getitem__(self, key) + return '{%s}' % ', '.join([('%s: %s' % (repr(key), repr(_getval(key)))) + for key in (self.scalars + self.sections)]) + + __str__ = __repr__ + __str__.__doc__ = "x.__str__() <==> str(x)" + + + # 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): + # create a copy rather than a reference + this_entry = list(this_entry) + elif isinstance(this_entry, tuple): + # create a copy rather than a reference + this_entry = tuple(this_entry) + newdict[entry] = this_entry + return newdict + + + def merge(self, indict): + """ + A recursive update - useful for merging config files. + + >>> a = '''[section1] + ... option1 = True + ... [[subsection]] + ... more_options = False + ... # end of file'''.splitlines() + >>> b = '''# File is user.ini + ... [section1] + ... option1 = False + ... # end of file'''.splitlines() + >>> c1 = ConfigObj(b) + >>> c2 = ConfigObj(a) + >>> c2.merge(c1) + >>> c2 + ConfigObj({'section1': {'option1': 'False', 'subsection': {'more_options': 'False'}}}) + """ + for key, val in indict.items(): + if (key in self and isinstance(self[key], dict) and + isinstance(val, dict)): + self[key].merge(val) + else: + self[key] = val + + + 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. + + .. admonition:: caution + + You can use ``walk`` to transform the names of members of a section + but you mustn't add or delete members. + + >>> config = '''[XXXXsection] + ... XXXXkey = XXXXvalue'''.splitlines() + >>> cfg = ConfigObj(config) + >>> cfg + ConfigObj({'XXXXsection': {'XXXXkey': 'XXXXvalue'}}) + >>> def transform(section, key): + ... val = section[key] + ... newkey = key.replace('XXXX', 'CLIENT1') + ... section.rename(key, newkey) + ... if isinstance(val, (tuple, list, dict)): + ... pass + ... else: + ... val = val.replace('XXXX', 'CLIENT1') + ... section[newkey] = val + >>> cfg.walk(transform, call_on_sections=True) + {'CLIENT1section': {'CLIENT1key': None}} + >>> cfg + ConfigObj({'CLIENT1section': {'CLIENT1key': 'CLIENT1value'}}) + """ + out = {} + # scalars first + for i in range(len(self.scalars)): + entry = self.scalars[i] + try: + val = function(self, entry, **keywargs) + # bound again in case name has changed + entry = self.scalars[i] + out[entry] = val + except Exception: + if raise_errors: + raise + else: + entry = self.scalars[i] + out[entry] = False + # then sections + for i in range(len(self.sections)): + entry = self.sections[i] + if call_on_sections: + try: + function(self, entry, **keywargs) + except Exception: + if raise_errors: + raise + else: + entry = self.sections[i] + out[entry] = False + # bound again in case name has changed + entry = self.sections[i] + # previous result is discarded + out[entry] = self[entry].walk( + function, + raise_errors=raise_errors, + call_on_sections=call_on_sections, + **keywargs) + return out + + + def as_bool(self, key): + """ + Accepts a key as input. The corresponding value must be a string or + the objects (``True`` or 1) or (``False`` or 0). We allow 0 and 1 to + retain compatibility with Python 2.2. + + If the string is one of ``True``, ``On``, ``Yes``, or ``1`` it returns + ``True``. + + If the string is one of ``False``, ``Off``, ``No``, or ``0`` it returns + ``False``. + + ``as_bool`` is not case sensitive. + + Any other input will raise a ``ValueError``. + + >>> a = ConfigObj() + >>> a['a'] = 'fish' + >>> a.as_bool('a') + Traceback (most recent call last): + ValueError: Value "fish" is neither True nor False + >>> a['b'] = 'True' + >>> a.as_bool('b') + 1 + >>> a['b'] = 'off' + >>> a.as_bool('b') + 0 + """ + val = self[key] + if val == True: + return True + elif val == False: + return False + else: + try: + if not isinstance(val, basestring): + # TODO: Why do we raise a KeyError here? + raise KeyError() + else: + return self.main._bools[val.lower()] + except KeyError: + raise ValueError('Value "%s" is neither True nor False' % val) + + + def as_int(self, key): + """ + A convenience method which coerces the specified value to an integer. + + If the value is an invalid literal for ``int``, a ``ValueError`` will + be raised. + + >>> a = ConfigObj() + >>> a['a'] = 'fish' + >>> a.as_int('a') + Traceback (most recent call last): + ValueError: invalid literal for int() with base 10: 'fish' + >>> a['b'] = '1' + >>> a.as_int('b') + 1 + >>> a['b'] = '3.2' + >>> a.as_int('b') + Traceback (most recent call last): + ValueError: invalid literal for int() with base 10: '3.2' + """ + return int(self[key]) + + + def as_float(self, key): + """ + A convenience method which coerces the specified value to a float. + + If the value is an invalid literal for ``float``, a ``ValueError`` will + be raised. + + >>> a = ConfigObj() + >>> a['a'] = 'fish' + >>> a.as_float('a') + Traceback (most recent call last): + ValueError: invalid literal for float(): fish + >>> a['b'] = '1' + >>> a.as_float('b') + 1.0 + >>> a['b'] = '3.2' + >>> a.as_float('b') + 3.2000000000000002 + """ + return float(self[key]) + + + def as_list(self, key): + """ + A convenience method which fetches the specified value, guaranteeing + that it is a list. + + >>> a = ConfigObj() + >>> a['a'] = 1 + >>> a.as_list('a') + [1] + >>> a['a'] = (1,) + >>> a.as_list('a') + [1] + >>> a['a'] = [1] + >>> a.as_list('a') + [1] + """ + result = self[key] + if isinstance(result, (tuple, list)): + return list(result) + return [result] + + + def restore_default(self, key): + """ + Restore (and return) default value for the specified key. + + This method will only work for a ConfigObj that was created + with a configspec and has been validated. + + If there is no default value for this key, ``KeyError`` is raised. + """ + default = self.default_values[key] + dict.__setitem__(self, key, default) + if key not in self.defaults: + self.defaults.append(key) + return default + + + def restore_defaults(self): + """ + Recursively restore default values to all members + that have them. + + This method will only work for a ConfigObj that was created + with a configspec and has been validated. + + It doesn't delete or modify entries without default values. + """ + for key in self.default_values: + self.restore_default(key) + + for section in self.sections: + self[section].restore_defaults() + + +class ConfigObj(Section): + """An object to read, create, and write config files.""" + + _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 + # FIXME: this regex adds a '' to the end of comma terminated lists + # workaround in ``_handle_value`` + _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 + (?:(?<!,)) # Empty value + )? # 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 + (?:) # Empty value + ) + \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), + } + + # Used by the ``istrue`` Section method + _bools = { + 'yes': True, 'no': False, + 'on': True, 'off': False, + '1': True, '0': False, + 'true': True, 'false': False, + } + + + def __init__(self, infile=None, options=None, configspec=None, encoding=None, + interpolation=True, raise_errors=False, list_values=True, + create_empty=False, file_error=False, stringify=True, + indent_type=None, default_encoding=None, unrepr=False, + write_empty_values=False, _inspec=False): + """ + Parse a config file or create a config file object. + + ``ConfigObj(infile=None, configspec=None, encoding=None, + interpolation=True, raise_errors=False, list_values=True, + create_empty=False, file_error=False, stringify=True, + indent_type=None, default_encoding=None, unrepr=False, + write_empty_values=False, _inspec=False)`` + """ + self._inspec = _inspec + # init the superclass + Section.__init__(self, self, 0, self) + + infile = infile or [] + + _options = {'configspec': configspec, + 'encoding': encoding, 'interpolation': interpolation, + 'raise_errors': raise_errors, 'list_values': list_values, + 'create_empty': create_empty, 'file_error': file_error, + 'stringify': stringify, 'indent_type': indent_type, + 'default_encoding': default_encoding, 'unrepr': unrepr, + 'write_empty_values': write_empty_values} + + if options is None: + options = _options + else: + import warnings + warnings.warn('Passing in an options dictionary to ConfigObj() is ' + 'deprecated. Use **options instead.', + DeprecationWarning, stacklevel=2) + + # TODO: check the values too. + for entry in options: + if entry not in OPTION_DEFAULTS: + raise TypeError('Unrecognised option "%s".' % entry) + for entry, value in OPTION_DEFAULTS.items(): + if entry not in options: + options[entry] = value + keyword_value = _options[entry] + if value != keyword_value: + options[entry] = keyword_value + + # XXXX this ignores an explicit list_values = True in combination + # with _inspec. The user should *never* do that anyway, but still... + if _inspec: + options['list_values'] = False + + self._initialise(options) + configspec = options['configspec'] + self._original_configspec = configspec + self._load(infile, configspec) + + + def _load(self, infile, configspec): + if isinstance(infile, basestring): + self.filename = infile + if os.path.isfile(infile): + h = open(infile, 'rb') + infile = h.read() or [] + h.close() + 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(infile, 'w') + h.write('') + h.close() + infile = [] + + elif isinstance(infile, (list, tuple)): + infile = list(infile) + + elif isinstance(infile, dict): + # initialise self + # the Section class handles creating subsections + if isinstance(infile, ConfigObj): + # get a copy of our ConfigObj + def set_section(in_section, this_section): + for entry in in_section.scalars: + this_section[entry] = in_section[entry] + for section in in_section.sections: + this_section[section] = {} + set_section(in_section[section], this_section[section]) + set_section(infile, self) + + else: + for entry in infile: + self[entry] = infile[entry] + del self._errors + + if configspec is not None: + self._handle_configspec(configspec) + else: + self.configspec = None + return + + elif getattr(infile, 'read', MISSING) is not MISSING: + # This supports file like objects + infile = infile.read() or [] + # needs splitting into lines - but needs doing *after* decoding + # in case it's not an 8 bit encoding + else: + raise TypeError('infile must be a filename, file like object, or list of lines.') + + if infile: + # don't do it for the empty ConfigObj + infile = self._handle_bom(infile) + # infile is now *always* a list + # + # Set the newlines attribute (first line ending it finds) + # and strip trailing '\n' or '\r' from lines + for line in infile: + if (not line) or (line[-1] not in ('\r', '\n', '\r\n')): + continue + for end in ('\r\n', '\n', '\r'): + if line.endswith(end): + self.newlines = end + break + break + + infile = [line.rstrip('\r\n') for line in infile] + + self._parse(infile) + # if we had any errors, now is the time to raise them + if self._errors: + info = "at line %s." % self._errors[0].line_number + if len(self._errors) > 1: + msg = "Parsing failed with several errors.\nFirst error %s" % info + error = ConfigObjError(msg) + else: + error = self._errors[0] + # set the errors attribute; it's a list of tuples: + # (error_type, message, line_number) + error.errors = self._errors + # set the config attribute + error.config = self + raise error + # delete private attributes + del self._errors + + if configspec is None: + self.configspec = None + else: + self._handle_configspec(configspec) + + + def _initialise(self, options=None): + if options is None: + options = OPTION_DEFAULTS + + # initialise a few variables + self.filename = None + self._errors = [] + self.raise_errors = options['raise_errors'] + self.interpolation = options['interpolation'] + self.list_values = options['list_values'] + self.create_empty = options['create_empty'] + self.file_error = options['file_error'] + self.stringify = options['stringify'] + self.indent_type = options['indent_type'] + self.encoding = options['encoding'] + self.default_encoding = options['default_encoding'] + self.BOM = False + self.newlines = None + self.write_empty_values = options['write_empty_values'] + self.unrepr = options['unrepr'] + + self.initial_comment = [] + self.final_comment = [] + self.configspec = None + + if self._inspec: + self.list_values = False + + # Clear section attributes as well + Section._initialise(self) + + + def __repr__(self): + def _getval(key): + try: + return self[key] + except MissingInterpolationOption: + return dict.__getitem__(self, key) + return ('ConfigObj({%s})' % + ', '.join([('%s: %s' % (repr(key), repr(_getval(key)))) + for key in (self.scalars + self.sections)])) + + + def _handle_bom(self, infile): + """ + Handle any BOM, and decode if necessary. + + If an encoding is specified, that *must* be used - but the BOM should + still be removed (and the BOM attribute set). + + (If the encoding is wrongly specified, then a BOM for an alternative + encoding won't be discovered or removed.) + + If an encoding is not specified, UTF8 or UTF16 BOM will be detected and + removed. The BOM attribute will be set. UTF16 will be decoded to + unicode. + + NOTE: This method must not be called with an empty ``infile``. + + Specifying the *wrong* encoding is likely to cause a + ``UnicodeDecodeError``. + + ``infile`` must always be returned as a list of lines, but may be + passed in as a single string. + """ + if ((self.encoding is not None) and + (self.encoding.lower() not in BOM_LIST)): + # No need to check for a BOM + # the encoding specified doesn't have one + # just decode + return self._decode(infile, self.encoding) + + if isinstance(infile, (list, tuple)): + line = infile[0] + else: + line = infile + if self.encoding is not None: + # encoding explicitly supplied + # And it could have an associated BOM + # TODO: if encoding is just UTF16 - we ought to check for both + # TODO: big endian and little endian versions. + enc = BOM_LIST[self.encoding.lower()] + if enc == 'utf_16': + # For UTF16 we try big endian and little endian + for BOM, (encoding, final_encoding) in BOMS.items(): + if not final_encoding: + # skip UTF8 + continue + if infile.startswith(BOM): + ### BOM discovered + ##self.BOM = True + # Don't need to remove BOM + return self._decode(infile, encoding) + + # If we get this far, will *probably* raise a DecodeError + # As it doesn't appear to start with a BOM + return self._decode(infile, self.encoding) + + # Must be UTF8 + BOM = BOM_SET[enc] + if not line.startswith(BOM): + return self._decode(infile, self.encoding) + + newline = line[len(BOM):] + + # BOM removed + if isinstance(infile, (list, tuple)): + infile[0] = newline + else: + infile = newline + self.BOM = True + return self._decode(infile, self.encoding) + + # No encoding specified - so we need to check for UTF8/UTF16 + for BOM, (encoding, final_encoding) in BOMS.items(): + if not line.startswith(BOM): + continue + else: + # BOM discovered + self.encoding = final_encoding + if not final_encoding: + self.BOM = True + # UTF8 + # remove BOM + newline = line[len(BOM):] + if isinstance(infile, (list, tuple)): + infile[0] = newline + else: + infile = newline + # UTF8 - don't decode + if isinstance(infile, basestring): + return infile.splitlines(True) + else: + return infile + # UTF16 - have to decode + return self._decode(infile, encoding) + + # No BOM discovered and no encoding specified, just return + if isinstance(infile, basestring): + # infile read from a file will be a single string + return infile.splitlines(True) + return infile + + + def _a_to_u(self, aString): + """Decode ASCII strings to unicode if a self.encoding is specified.""" + if self.encoding: + return aString.decode('ascii') + else: + return aString + + + def _decode(self, infile, encoding): + """ + Decode infile to unicode. Using the specified encoding. + + if is a string, it also needs converting to a list. + """ + if isinstance(infile, basestring): + # can't be unicode + # NOTE: Could raise a ``UnicodeDecodeError`` + return infile.decode(encoding).splitlines(True) + for i, line in enumerate(infile): + if not isinstance(line, unicode): + # NOTE: The isinstance test here handles mixed lists of unicode/string + # NOTE: But the decode will break on any non-string values + # NOTE: Or could raise a ``UnicodeDecodeError`` + infile[i] = line.decode(encoding) + return infile + + + def _decode_element(self, line): + """Decode element to unicode if necessary.""" + if not self.encoding: + return line + if isinstance(line, str) and self.default_encoding: + return line.decode(self.default_encoding) + return line + + + def _str(self, value): + """ + Used by ``stringify`` within validate, to turn non-string values + into strings. + """ + if not isinstance(value, basestring): + return str(value) + else: + return value + + + def _parse(self, infile): + """Actually parse the config file.""" + temp_list_values = self.list_values + if self.unrepr: + self.list_values = False + + comment_list = [] + done_start = False + this_section = self + maxline = len(infile) - 1 + cur_index = -1 + reset_comment = False + + while cur_index < maxline: + if reset_comment: + comment_list = [] + cur_index += 1 + line = infile[cur_index] + sline = line.strip() + # do we have anything on the line ? + if not sline or sline.startswith('#'): + reset_comment = False + comment_list.append(line) + continue + + if not done_start: + # preserve initial comment + self.initial_comment = comment_list + comment_list = [] + done_start = True + + reset_comment = True + # first we check if it's a section marker + mat = self._sectionmarker.match(line) + if mat is not None: + # is a section line + (indent, sect_open, sect_name, sect_close, comment) = mat.groups() + if indent and (self.indent_type is None): + self.indent_type = indent + cur_depth = sect_open.count('[') + if cur_depth != sect_close.count(']'): + self._handle_error("Cannot compute the section depth at line %s.", + NestingError, infile, cur_index) + continue + + if cur_depth < this_section.depth: + # the new section is dropping back to a previous level + try: + parent = self._match_depth(this_section, + cur_depth).parent + except SyntaxError: + self._handle_error("Cannot compute nesting level at line %s.", + NestingError, infile, cur_index) + continue + elif cur_depth == this_section.depth: + # the new section is a sibling of the current section + parent = this_section.parent + elif cur_depth == this_section.depth + 1: + # the new section is a child the current section + parent = this_section + else: + self._handle_error("Section too nested at line %s.", + NestingError, infile, cur_index) + + sect_name = self._unquote(sect_name) + if sect_name in parent: + self._handle_error('Duplicate section name at line %s.', + DuplicateError, infile, cur_index) + continue + + # create the new section + this_section = Section( + parent, + cur_depth, + self, + name=sect_name) + parent[sect_name] = this_section + parent.inline_comments[sect_name] = comment + parent.comments[sect_name] = comment_list + continue + # + # it's not a section marker, + # so it should be a valid ``key = value`` line + mat = self._keyword.match(line) + if mat is None: + # it neither matched as a keyword + # or a section marker + self._handle_error( + 'Invalid line at line "%s".', + ParseError, infile, cur_index) + else: + # is a keyword value + # value will include any inline comment + (indent, key, value) = mat.groups() + if indent and (self.indent_type is None): + self.indent_type = indent + # check for a multiline value + if value[:3] in ['"""', "'''"]: + try: + value, comment, cur_index = self._multiline( + value, infile, cur_index, maxline) + except SyntaxError: + self._handle_error( + 'Parse error in value at line %s.', + ParseError, infile, cur_index) + continue + else: + if self.unrepr: + comment = '' + try: + value = unrepr(value) + except Exception, e: + if type(e) == UnknownType: + msg = 'Unknown name or type in value at line %s.' + else: + msg = 'Parse error in value at line %s.' + self._handle_error(msg, UnreprError, infile, + cur_index) + continue + else: + if self.unrepr: + comment = '' + try: + value = unrepr(value) + except Exception, e: + if isinstance(e, UnknownType): + msg = 'Unknown name or type in value at line %s.' + else: + msg = 'Parse error in value at line %s.' + self._handle_error(msg, UnreprError, infile, + cur_index) + continue + else: + # extract comment and lists + try: + (value, comment) = self._handle_value(value) + except SyntaxError: + self._handle_error( + 'Parse error in value at line %s.', + ParseError, infile, cur_index) + continue + # + key = self._unquote(key) + if key in this_section: + self._handle_error( + 'Duplicate keyword name at line %s.', + DuplicateError, infile, cur_index) + continue + # add the key. + # we set unrepr because if we have got this far we will never + # be creating a new section + this_section.__setitem__(key, value, unrepr=True) + this_section.inline_comments[key] = comment + this_section.comments[key] = comment_list + continue + # + if self.indent_type is None: + # no indentation used, set the type accordingly + self.indent_type = '' + + # preserve the final comment + if not self and not self.initial_comment: + self.initial_comment = comment_list + elif not reset_comment: + self.final_comment = comment_list + self.list_values = temp_list_values + + + def _match_depth(self, sect, depth): + """ + Given a section and a depth level, walk back through the sections + parents to see if the depth level matches a previous section. + + Return a reference to the right section, + or raise a SyntaxError. + """ + while depth < sect.depth: + if sect is sect.parent: + # we've reached the top level already + raise SyntaxError() + sect = sect.parent + if sect.depth == depth: + return sect + # shouldn't get here + raise SyntaxError() + + + def _handle_error(self, text, ErrorClass, infile, cur_index): + """ + Handle an error according to the error settings. + + Either raise the error or store it. + The error will have occured at ``cur_index`` + """ + line = infile[cur_index] + cur_index += 1 + message = text % cur_index + error = ErrorClass(message, cur_index, line) + if self.raise_errors: + # raise the error - parsing stops here + raise error + # store the error + # reraise when parsing has finished + self._errors.append(error) + + + def _unquote(self, value): + """Return an unquoted version of a value""" + if not value: + # should only happen during parsing of lists + raise SyntaxError + if (value[0] == value[-1]) and (value[0] in ('"', "'")): + value = value[1:-1] + return value + + + def _quote(self, value, multiline=True): + """ + Return a safely quoted version of a value. + + Raise a ConfigObjError if the value cannot be safely quoted. + If multiline is ``True`` (default) then use triple quotes + if necessary. + + * Don't quote values that don't need it. + * Recursively quote members of a list and return a comma joined list. + * Multiline is ``False`` for lists. + * Obey list syntax for empty and single member lists. + + If ``list_values=False`` then the value is only quoted if it contains + a ``\\n`` (is multiline) or '#'. + + If ``write_empty_values`` is set, and the value is an empty string, it + won't be quoted. + """ + if multiline and self.write_empty_values and value == '': + # Only if multiline is set, so that it is used for values not + # keys, and not values that are part of a list + return '' + + if multiline and isinstance(value, (list, tuple)): + if not value: + return ',' + elif len(value) == 1: + return self._quote(value[0], multiline=False) + ',' + return ', '.join([self._quote(val, multiline=False) + for val in value]) + if not isinstance(value, basestring): + if self.stringify: + value = str(value) + else: + raise TypeError('Value "%s" is not a string.' % value) + + if not value: + return '""' + + no_lists_no_quotes = not self.list_values and '\n' not in value and '#' not in value + need_triple = multiline and ((("'" in value) and ('"' in value)) or ('\n' in value )) + hash_triple_quote = multiline and not need_triple and ("'" in value) and ('"' in value) and ('#' in value) + check_for_single = (no_lists_no_quotes or not need_triple) and not hash_triple_quote + + if check_for_single: + if not self.list_values: + # we don't quote if ``list_values=False`` + quot = noquot + # for normal values either single or double quotes will do + elif '\n' in value: + # will only happen if multiline is off - e.g. '\n' in key + raise ConfigObjError('Value "%s" cannot be safely quoted.' % value) + elif ((value[0] not in wspace_plus) and + (value[-1] not in wspace_plus) and + (',' not in value)): + quot = noquot + else: + quot = self._get_single_quote(value) + else: + # if value has '\n' or "'" *and* '"', it will need triple quotes + quot = self._get_triple_quote(value) + + if quot == noquot and '#' in value and self.list_values: + quot = self._get_single_quote(value) + + return quot % value + + + def _get_single_quote(self, value): + if ("'" in value) and ('"' in value): + raise ConfigObjError('Value "%s" cannot be safely quoted.' % value) + elif '"' in value: + quot = squot + else: + quot = dquot + return quot + + + def _get_triple_quote(self, value): + if (value.find('"""') != -1) and (value.find("'''") != -1): + raise ConfigObjError('Value "%s" cannot be safely quoted.' % value) + if value.find('"""') == -1: + quot = tdquot + else: + quot = tsquot + return quot + + + def _handle_value(self, value): + """ + Given a value string, unquote, remove comment, + handle lists. (including empty and single member lists) + """ + if self._inspec: + # Parsing a configspec so don't handle comments + return (value, '') + # do we look for lists in values ? + if not self.list_values: + mat = self._nolistvalue.match(value) + if mat is None: + raise SyntaxError() + # NOTE: we don't unquote here + return mat.groups() + # + mat = self._valueexp.match(value) + if mat is None: + # the value is badly constructed, probably badly quoted, + # or an invalid list + raise SyntaxError() + (list_values, single, empty_list, comment) = mat.groups() + if (list_values == '') and (single is None): + # change this if you want to accept empty values + raise SyntaxError() + # NOTE: note there is no error handling from here if the regex + # is wrong: then incorrect values will slip through + if empty_list is not None: + # the single comma - meaning an empty list + return ([], comment) + if single is not None: + # handle empty values + if list_values and not single: + # FIXME: the '' is a workaround because our regex now matches + # '' at the end of a list if it has a trailing comma + single = None + else: + single = single or '""' + single = self._unquote(single) + if list_values == '': + # not a list value + return (single, comment) + the_list = self._listvalueexp.findall(list_values) + the_list = [self._unquote(val) for val in the_list] + if single is not None: + the_list += [single] + return (the_list, comment) + + + def _multiline(self, value, infile, cur_index, maxline): + """Extract the value, where we are in a multiline situation.""" + quot = value[:3] + newvalue = value[3:] + single_line = self._triple_quote[quot][0] + multi_line = self._triple_quote[quot][1] + mat = single_line.match(value) + if mat is not None: + retval = list(mat.groups()) + retval.append(cur_index) + return retval + elif newvalue.find(quot) != -1: + # somehow the triple quote is missing + raise SyntaxError() + # + while cur_index < maxline: + cur_index += 1 + newvalue += '\n' + line = infile[cur_index] + if line.find(quot) == -1: + newvalue += line + else: + # end of multiline, process it + break + else: + # we've got to the end of the config, oops... + raise SyntaxError() + mat = multi_line.match(line) + if mat is None: + # a badly formed line + raise SyntaxError() + (value, comment) = mat.groups() + return (newvalue + value, comment, cur_index) + + + def _handle_configspec(self, configspec): + """Parse the configspec.""" + # FIXME: Should we check that the configspec was created with the + # correct settings ? (i.e. ``list_values=False``) + if not isinstance(configspec, ConfigObj): + try: + configspec = ConfigObj(configspec, + raise_errors=True, + file_error=True, + _inspec=True) + except ConfigObjError, e: + # FIXME: Should these errors have a reference + # to the already parsed ConfigObj ? + raise ConfigspecError('Parsing configspec failed: %s' % e) + except IOError, e: + raise IOError('Reading configspec failed: %s' % e) + + self.configspec = configspec + + + + def _set_configspec(self, section, copy): + """ + Called by validate. Handles setting the configspec on subsections + including sections to be validated by __many__ + """ + configspec = section.configspec + many = configspec.get('__many__') + if isinstance(many, dict): + for entry in section.sections: + if entry not in configspec: + section[entry].configspec = many + + for entry in configspec.sections: + if entry == '__many__': + continue + if entry not in section: + section[entry] = {} + section[entry]._created = True + if copy: + # copy comments + section.comments[entry] = configspec.comments.get(entry, []) + section.inline_comments[entry] = configspec.inline_comments.get(entry, '') + + # Could be a scalar when we expect a section + if isinstance(section[entry], Section): + section[entry].configspec = configspec[entry] + + + def _write_line(self, indent_string, entry, this_entry, comment): + """Write an individual line, for the write method""" + # NOTE: the calls to self._quote here handles non-StringType values. + if not self.unrepr: + val = self._decode_element(self._quote(this_entry)) + else: + val = repr(this_entry) + return '%s%s%s%s%s' % (indent_string, + self._decode_element(self._quote(entry, multiline=False)), + self._a_to_u(' = '), + val, + self._decode_element(comment)) + + + def _write_marker(self, indent_string, depth, entry, comment): + """Write a section marker line""" + return '%s%s%s%s%s' % (indent_string, + self._a_to_u('[' * depth), + self._quote(self._decode_element(entry), multiline=False), + self._a_to_u(']' * depth), + self._decode_element(comment)) + + + def _handle_comment(self, comment): + """Deal with a comment.""" + if not comment: + return '' + start = self.indent_type + if not comment.startswith('#'): + start += self._a_to_u(' # ') + return (start + comment) + + + # Public methods + + def write(self, outfile=None, section=None): + """ + Write the current ConfigObj as a file + + tekNico: FIXME: use StringIO instead of real files + + >>> filename = a.filename + >>> a.filename = 'test.ini' + >>> a.write() + >>> a.filename = filename + >>> a == ConfigObj('test.ini', raise_errors=True) + 1 + >>> import os + >>> os.remove('test.ini') + """ + if self.indent_type is None: + # this can be true if initialised from a dictionary + self.indent_type = DEFAULT_INDENT_TYPE + + out = [] + cs = self._a_to_u('#') + csp = self._a_to_u('# ') + if section is None: + int_val = self.interpolation + self.interpolation = False + section = self + for line in self.initial_comment: + line = self._decode_element(line) + stripped_line = line.strip() + if stripped_line and not stripped_line.startswith(cs): + line = csp + line + out.append(line) + + indent_string = self.indent_type * section.depth + for entry in (section.scalars + section.sections): + if entry in section.defaults: + # don't write out default values + continue + for comment_line in section.comments[entry]: + comment_line = self._decode_element(comment_line.lstrip()) + if comment_line and not comment_line.startswith(cs): + comment_line = csp + comment_line + out.append(indent_string + comment_line) + this_entry = section[entry] + comment = self._handle_comment(section.inline_comments[entry]) + + if isinstance(this_entry, dict): + # a section + out.append(self._write_marker( + indent_string, + this_entry.depth, + entry, + comment)) + out.extend(self.write(section=this_entry)) + else: + out.append(self._write_line( + indent_string, + entry, + this_entry, + comment)) + + if section is self: + for line in self.final_comment: + line = self._decode_element(line) + stripped_line = line.strip() + if stripped_line and not stripped_line.startswith(cs): + line = csp + line + out.append(line) + self.interpolation = int_val + + if section is not self: + return out + + if (self.filename is None) and (outfile is None): + # output a list of lines + # might need to encode + # NOTE: This will *screw* UTF16, each line will start with the BOM + if self.encoding: + out = [l.encode(self.encoding) for l in out] + if (self.BOM and ((self.encoding is None) or + (BOM_LIST.get(self.encoding.lower()) == 'utf_8'))): + # Add the UTF8 BOM + if not out: + out.append('') + out[0] = BOM_UTF8 + out[0] + return out + + # Turn the list to a string, joined with correct newlines + newline = self.newlines or os.linesep + if (getattr(outfile, 'mode', None) is not None and outfile.mode == 'w' + and sys.platform == 'win32' and newline == '\r\n'): + # Windows specific hack to avoid writing '\r\r\n' + newline = '\n' + output = self._a_to_u(newline).join(out) + if self.encoding: + output = output.encode(self.encoding) + if self.BOM and ((self.encoding is None) or match_utf8(self.encoding)): + # Add the UTF8 BOM + output = BOM_UTF8 + output + + if not output.endswith(newline): + output += newline + if outfile is not None: + outfile.write(output) + else: + h = open(self.filename, 'wb') + h.write(output) + h.close() + + + def validate(self, validator, preserve_errors=False, copy=False, + section=None): + """ + Test the ConfigObj against a configspec. + + It uses the ``validator`` object from *validate.py*. + + To run ``validate`` on the current ConfigObj, call: :: + + test = config.validate(validator) + + (Normally having previously passed in the configspec when the ConfigObj + was created - you can dynamically assign a dictionary of checks to the + ``configspec`` attribute of a section though). + + It returns ``True`` if everything passes, or a dictionary of + pass/fails (True/False). If every member of a subsection passes, it + will just have the value ``True``. (It also returns ``False`` if all + members fail). + + In addition, it converts the values from strings to their native + types if their checks pass (and ``stringify`` is set). + + If ``preserve_errors`` is ``True`` (``False`` is default) then instead + of a marking a fail with a ``False``, it will preserve the actual + exception object. This can contain info about the reason for failure. + For example the ``VdtValueTooSmallError`` indicates that the value + supplied was too small. If a value (or section) is missing it will + still be marked as ``False``. + + You must have the validate module to use ``preserve_errors=True``. + + You can then use the ``flatten_errors`` function to turn your nested + results dictionary into a flattened list of failures - useful for + displaying meaningful error messages. + """ + if section is None: + if self.configspec is None: + raise ValueError('No configspec supplied.') + if preserve_errors: + # We do this once to remove a top level dependency on the validate module + # Which makes importing configobj faster + from validate import VdtMissingValue + self._vdtMissingValue = VdtMissingValue + + section = self + + if copy: + section.initial_comment = section.configspec.initial_comment + section.final_comment = section.configspec.final_comment + section.encoding = section.configspec.encoding + section.BOM = section.configspec.BOM + section.newlines = section.configspec.newlines + section.indent_type = section.configspec.indent_type + + # + # section.default_values.clear() #?? + configspec = section.configspec + self._set_configspec(section, copy) + + + def validate_entry(entry, spec, val, missing, ret_true, ret_false): + section.default_values.pop(entry, None) + + try: + section.default_values[entry] = validator.get_default_value(configspec[entry]) + except (KeyError, AttributeError, validator.baseErrorClass): + # No default, bad default or validator has no 'get_default_value' + # (e.g. SimpleVal) + pass + + try: + check = validator.check(spec, + val, + missing=missing + ) + except validator.baseErrorClass, e: + if not preserve_errors or isinstance(e, self._vdtMissingValue): + out[entry] = False + else: + # preserve the error + out[entry] = e + ret_false = False + ret_true = False + else: + ret_false = False + out[entry] = True + if self.stringify or missing: + # if we are doing type conversion + # or the value is a supplied default + if not self.stringify: + if isinstance(check, (list, tuple)): + # preserve lists + check = [self._str(item) for item in check] + elif missing and check is None: + # convert the None from a default to a '' + check = '' + else: + check = self._str(check) + if (check != val) or missing: + section[entry] = check + if not copy and missing and entry not in section.defaults: + section.defaults.append(entry) + return ret_true, ret_false + + # + out = {} + ret_true = True + ret_false = True + + unvalidated = [k for k in section.scalars if k not in configspec] + incorrect_sections = [k for k in configspec.sections if k in section.scalars] + incorrect_scalars = [k for k in configspec.scalars if k in section.sections] + + for entry in configspec.scalars: + if entry in ('__many__', '___many___'): + # reserved names + continue + if (not entry in section.scalars) or (entry in section.defaults): + # missing entries + # or entries from defaults + missing = True + val = None + if copy and entry not in section.scalars: + # copy comments + section.comments[entry] = ( + configspec.comments.get(entry, [])) + section.inline_comments[entry] = ( + configspec.inline_comments.get(entry, '')) + # + else: + missing = False + val = section[entry] + + ret_true, ret_false = validate_entry(entry, configspec[entry], val, + missing, ret_true, ret_false) + + many = None + if '__many__' in configspec.scalars: + many = configspec['__many__'] + elif '___many___' in configspec.scalars: + many = configspec['___many___'] + + if many is not None: + for entry in unvalidated: + val = section[entry] + ret_true, ret_false = validate_entry(entry, many, val, False, + ret_true, ret_false) + unvalidated = [] + + for entry in incorrect_scalars: + ret_true = False + if not preserve_errors: + out[entry] = False + else: + ret_false = False + msg = 'Value %r was provided as a section' % entry + out[entry] = validator.baseErrorClass(msg) + for entry in incorrect_sections: + ret_true = False + if not preserve_errors: + out[entry] = False + else: + ret_false = False + msg = 'Section %r was provided as a single value' % entry + out[entry] = validator.baseErrorClass(msg) + + # Missing sections will have been created as empty ones when the + # configspec was read. + for entry in section.sections: + # FIXME: this means DEFAULT is not copied in copy mode + if section is self and entry == 'DEFAULT': + continue + if section[entry].configspec is None: + unvalidated.append(entry) + continue + if copy: + section.comments[entry] = configspec.comments.get(entry, []) + section.inline_comments[entry] = configspec.inline_comments.get(entry, '') + check = self.validate(validator, preserve_errors=preserve_errors, copy=copy, section=section[entry]) + out[entry] = check + if check == False: + ret_true = False + elif check == True: + ret_false = False + else: + ret_true = False + + section.extra_values = unvalidated + if preserve_errors and not section._created: + # If the section wasn't created (i.e. it wasn't missing) + # then we can't return False, we need to preserve errors + ret_false = False + # + if ret_false and preserve_errors and out: + # If we are preserving errors, but all + # the failures are from missing sections / values + # then we can return False. Otherwise there is a + # real failure that we need to preserve. + ret_false = not any(out.values()) + if ret_true: + return True + elif ret_false: + return False + return out + + + def reset(self): + """Clear ConfigObj instance and restore to 'freshly created' state.""" + self.clear() + self._initialise() + # FIXME: Should be done by '_initialise', but ConfigObj constructor (and reload) + # requires an empty dictionary + self.configspec = None + # Just to be sure ;-) + self._original_configspec = None + + + def reload(self): + """ + Reload a ConfigObj from file. + + This method raises a ``ReloadError`` if the ConfigObj doesn't have + a filename attribute pointing to a file. + """ + if not isinstance(self.filename, basestring): + raise ReloadError() + + filename = self.filename + current_options = {} + for entry in OPTION_DEFAULTS: + if entry == 'configspec': + continue + current_options[entry] = getattr(self, entry) + + configspec = self._original_configspec + current_options['configspec'] = configspec + + self.clear() + self._initialise(current_options) + self._load(filename, configspec) + + + +class SimpleVal(object): + """ + A simple validator. + Can be used to check that all members expected are present. + + To use it, provide a configspec with all your members in (the value given + will be ignored). Pass an instance of ``SimpleVal`` to the ``validate`` + method of your ``ConfigObj``. ``validate`` will return ``True`` if all + members are present, or a dictionary with True/False meaning + present/missing. (Whole missing sections will be replaced with ``False``) + """ + + def __init__(self): + self.baseErrorClass = ConfigObjError + + def check(self, check, member, missing=False): + """A dummy check method, always returns the value unchanged.""" + if missing: + raise self.baseErrorClass() + return member + + +def flatten_errors(cfg, res, levels=None, results=None): + """ + An example function that will turn a nested dictionary of results + (as returned by ``ConfigObj.validate``) into a flat list. + + ``cfg`` is the ConfigObj instance being checked, ``res`` is the results + dictionary returned by ``validate``. + + (This is a recursive function, so you shouldn't use the ``levels`` or + ``results`` arguments - they are used by the function.) + + Returns a list of keys that failed. Each member of the list is a tuple:: + + ([list of sections...], key, result) + + If ``validate`` was called with ``preserve_errors=False`` (the default) + then ``result`` will always be ``False``. + + *list of sections* is a flattened list of sections that the key was found + in. + + If the section was missing (or a section was expected and a scalar provided + - or vice-versa) then key will be ``None``. + + If the value (or section) was missing then ``result`` will be ``False``. + + If ``validate`` was called with ``preserve_errors=True`` and a value + was present, but failed the check, then ``result`` will be the exception + object returned. You can use this as a string that describes the failure. + + For example *The value "3" is of the wrong type*. + """ + if levels is None: + # first time called + levels = [] + results = [] + if res == True: + return results + if res == False or isinstance(res, Exception): + results.append((levels[:], None, res)) + if levels: + levels.pop() + return results + for (key, val) in res.items(): + if val == True: + continue + if isinstance(cfg.get(key), dict): + # Go down one level + levels.append(key) + flatten_errors(cfg[key], val, levels, results) + continue + results.append((levels[:], key, val)) + # + # Go up one level + if levels: + levels.pop() + # + return results + + +def get_extra_values(conf, _prepend=()): + """ + Find all the values and sections not in the configspec from a validated + ConfigObj. + + ``get_extra_values`` returns a list of tuples where each tuple represents + either an extra section, or an extra value. + + The tuples contain two values, a tuple representing the section the value + is in and the name of the extra values. For extra values in the top level + section the first member will be an empty tuple. For values in the 'foo' + section the first member will be ``('foo',)``. For members in the 'bar' + subsection of the 'foo' section the first member will be ``('foo', 'bar')``. + + NOTE: If you call ``get_extra_values`` on a ConfigObj instance that hasn't + been validated it will return an empty list. + """ + out = [] + + out.extend([(_prepend, name) for name in conf.extra_values]) + for name in conf.sections: + if name not in conf.extra_values: + out.extend(get_extra_values(conf[name], _prepend + (name,))) + return out + + +"""*A programming language is a medium of expression.* - Paul Graham""" |