configobj.py
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| py
Geri
# configobj.py # A config file reader/writer that supports nested sections in config files. # Copyright (C) 2005-2014: # (name) : (email) # Michael Foord: fuzzyman AT voidspace DOT org DOT uk # Nicola Larosa: nico AT tekNico DOT net # Rob Dennis: rdennis AT gmail DOT com # Eli Courtwright: eli AT courtwright DOT org # This software is licensed under the terms of the BSD license. # http://opensource.org/licenses/BSD-3-Clause # ConfigObj 5 - main repository for documentation and issue tracking: # https://github.com/DiffSK/configobj import os import re import sys from codecs import BOM_UTF8, BOM_UTF16, BOM_UTF16_BE, BOM_UTF16_LE import six from _version import __version__ # 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() __all__ = ( '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, } # this could be replaced if six is used for compatibility, or there are no # more assertions about items being a string 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): if m is None: raise UnknownType(o.__class__.__name__) return m(o) def build_List(self, o): return list(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] = next(i) 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 = list(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 # this is supposed to be safe import ast return ast.literal_eval(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.items(): 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, six.string_types): return self._interpolate(key, val) if isinstance(val, list): def _check(entry): if isinstance(entry, six.string_types): 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, six.string_types): 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, six.string_types): pass elif isinstance(value, (list, tuple)): for entry in value: if not isinstance(entry, six.string_types): 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 list(zip((self.scalars + self.sections), list(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(list(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(list(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 list(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, six.string_types): # 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') #doctest: +IGNORE_EXCEPTION_DETAIL 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') #doctest: +ELLIPSIS 3.2... """ 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 list(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, six.string_types): self.filename = infile if os.path.isfile(infile): with open(infile, 'rb') as h: content = h.readlines() or [] 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 with open(infile, 'w') as h: h.write('') content = [] elif isinstance(infile, (list, tuple)): content = 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 content = 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 content: # don't do it for the empty ConfigObj content = self._handle_bom(content) # 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 content: if (not line) or (line[-1] not in ('\r', '\n')): continue for end in ('\r\n', '\n', '\r'): if line.endswith(end): self.newlines = end break break assert all(isinstance(line, six.string_types) for line in content), repr(content) content = [line.rstrip('\r\n') for line in content] self._parse(content) # 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 isinstance(line, six.text_type): # it's already decoded and there's no need to do anything # else, just use the _decode utility method to handle # listifying appropriately return self._decode(infile, self.encoding) 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 list(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 list(BOMS.items()): if not isinstance(line, six.binary_type) or not line.startswith(BOM): # didn't specify a BOM, or it's not a bytestring 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 # UTF-8 if isinstance(infile, six.text_type): return infile.splitlines(True) elif isinstance(infile, six.binary_type): return infile.decode('utf-8').splitlines(True) else: return self._decode(infile, 'utf-8') # UTF16 - have to decode return self._decode(infile, encoding) if six.PY2 and isinstance(line, str): # don't actually do any decoding, since we're on python 2 and # returning a bytestring is fine return self._decode(infile, None) # No BOM discovered and no encoding specified, default to UTF-8 if isinstance(infile, six.binary_type): return infile.decode('utf-8').splitlines(True) else: return self._decode(infile, 'utf-8') def _a_to_u(self, aString): """Decode ASCII strings to unicode if a self.encoding is specified.""" if isinstance(aString, six.binary_type) and self.encoding: return aString.decode(self.encoding) 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, six.string_types): return infile.splitlines(True) if isinstance(infile, six.binary_type): # NOTE: Could raise a ``UnicodeDecodeError`` if encoding: return infile.decode(encoding).splitlines(True) else: return infile.splitlines(True) if encoding: for i, line in enumerate(infile): if isinstance(line, six.binary_type): # 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 isinstance(line, six.binary_type) and self.default_encoding: return line.decode(self.default_encoding) else: return line # TODO: this may need to be modified def _str(self, value): """ Used by ``stringify`` within validate, to turn non-string values into strings. """ if not isinstance(value, six.string_types): # intentially 'str' because it's just whatever the "normal" # string type is for the python version we're dealing with 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", 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", 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", NestingError, infile, cur_index) continue sect_name = self._unquote(sect_name) if sect_name in parent: self._handle_error('Duplicate section name', 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: self._handle_error( 'Invalid line ({0!r}) (matched as neither section nor keyword)'.format(line), 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 multiline value', ParseError, infile, cur_index) continue else: if self.unrepr: comment = '' try: value = unrepr(value) except Exception as e: if type(e) == UnknownType: msg = 'Unknown name or type in value' else: msg = 'Parse error from unrepr-ing multiline value' self._handle_error(msg, UnreprError, infile, cur_index) continue else: if self.unrepr: comment = '' try: value = unrepr(value) except Exception as e: if isinstance(e, UnknownType): msg = 'Unknown name or type in value' else: msg = 'Parse error from unrepr-ing value' 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', ParseError, infile, cur_index) continue # key = self._unquote(key) if key in this_section: self._handle_error( 'Duplicate keyword name', 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 = '{0} at line {1}.'.format(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, six.string_types): if self.stringify: # intentially 'str' because it's just whatever the "normal" # string type is for the python version we're dealing with 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 as e: # FIXME: Should these errors have a reference # to the already parsed ConfigObj ? raise ConfigspecError('Parsing configspec failed: %s' % e) except IOError as 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, Section): # 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 not output.endswith(newline): output += newline if isinstance(output, six.binary_type): output_bytes = output else: output_bytes = output.encode(self.encoding or self.default_encoding or 'ascii') if self.BOM and ((self.encoding is None) or match_utf8(self.encoding)): # Add the UTF8 BOM output_bytes = BOM_UTF8 + output_bytes if outfile is not None: outfile.write(output_bytes) else: with open(self.filename, 'wb') as h: h.write(output_bytes) 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 as 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, six.string_types): 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 sorted(results) if res == False or isinstance(res, Exception): results.append((levels[:], None, res)) if levels: levels.pop() return sorted(results) for (key, val) in list(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 sorted(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"""
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