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Edit File : configHandler.py \| Size : 31.44 KB
"""Provides access to stored IDLE configuration information. Refer to the comments at the beginning of config-main.def for a description of the available configuration files and the design implemented to update user configuration information. In particular, user configuration choices which duplicate the defaults will be removed from the user's configuration files, and if a file becomes empty, it will be deleted. The contents of the user files may be altered using the Options/Configure IDLE menu to access the configuration GUI (configDialog.py), or manually. Throughout this module there is an emphasis on returning useable defaults when a problem occurs in returning a requested configuration value back to idle. This is to allow IDLE to continue to function in spite of errors in the retrieval of config information. When a default is returned instead of a requested config value, a message is printed to stderr to aid in configuration problem notification and resolution. """ # TODOs added Oct 2014, tjr import os import sys from configparser import ConfigParser from tkinter import TkVersion from tkinter.font import Font, nametofont class InvalidConfigType(Exception): pass class InvalidConfigSet(Exception): pass class InvalidFgBg(Exception): pass class InvalidTheme(Exception): pass class IdleConfParser(ConfigParser): """ A ConfigParser specialised for idle configuration file handling """ def __init__(self, cfgFile, cfgDefaults=None): """ cfgFile - string, fully specified configuration file name """ self.file = cfgFile ConfigParser.__init__(self, defaults=cfgDefaults, strict=False) def Get(self, section, option, type=None, default=None, raw=False): """ Get an option value for given section/option or return default. If type is specified, return as type. """ # TODO Use default as fallback, at least if not None # Should also print Warning(file, section, option). # Currently may raise ValueError if not self.has_option(section, option): return default if type == 'bool': return self.getboolean(section, option) elif type == 'int': return self.getint(section, option) else: return self.get(section, option, raw=raw) def GetOptionList(self, section): "Return a list of options for given section, else []." if self.has_section(section): return self.options(section) else: #return a default value return [] def Load(self): "Load the configuration file from disk." self.read(self.file) class IdleUserConfParser(IdleConfParser): """ IdleConfigParser specialised for user configuration handling. """ def AddSection(self, section): "If section doesn't exist, add it." if not self.has_section(section): self.add_section(section) def RemoveEmptySections(self): "Remove any sections that have no options." for section in self.sections(): if not self.GetOptionList(section): self.remove_section(section) def IsEmpty(self): "Return True if no sections after removing empty sections." self.RemoveEmptySections() return not self.sections() def RemoveOption(self, section, option): """Return True if option is removed from section, else False. False if either section does not exist or did not have option. """ if self.has_section(section): return self.remove_option(section, option) return False def SetOption(self, section, option, value): """Return True if option is added or changed to value, else False. Add section if required. False means option already had value. """ if self.has_option(section, option): if self.get(section, option) == value: return False else: self.set(section, option, value) return True else: if not self.has_section(section): self.add_section(section) self.set(section, option, value) return True def RemoveFile(self): "Remove user config file self.file from disk if it exists." if os.path.exists(self.file): os.remove(self.file) def Save(self): """Update user configuration file. Remove empty sections. If resulting config isn't empty, write the file to disk. If config is empty, remove the file from disk if it exists. """ if not self.IsEmpty(): fname = self.file try: cfgFile = open(fname, 'w') except OSError: os.unlink(fname) cfgFile = open(fname, 'w') with cfgFile: self.write(cfgFile) else: self.RemoveFile() class IdleConf: """Hold config parsers for all idle config files in singleton instance. Default config files, self.defaultCfg -- for config_type in self.config_types: (idle install dir)/config-{config-type}.def User config files, self.userCfg -- for config_type in self.config_types: (user home dir)/.idlerc/config-{config-type}.cfg """ def __init__(self): self.config_types = ('main', 'extensions', 'highlight', 'keys') self.defaultCfg = {} self.userCfg = {} self.cfg = {} # TODO use to select userCfg vs defaultCfg self.CreateConfigHandlers() self.LoadCfgFiles() def CreateConfigHandlers(self): "Populate default and user config parser dictionaries." #build idle install path if __name__ != '__main__': # we were imported idleDir=os.path.dirname(__file__) else: # we were exec'ed (for testing only) idleDir=os.path.abspath(sys.path[0]) userDir=self.GetUserCfgDir() defCfgFiles = {} usrCfgFiles = {} # TODO eliminate these temporaries by combining loops for cfgType in self.config_types: #build config file names defCfgFiles[cfgType] = os.path.join( idleDir, 'config-' + cfgType + '.def') usrCfgFiles[cfgType] = os.path.join( userDir, 'config-' + cfgType + '.cfg') for cfgType in self.config_types: #create config parsers self.defaultCfg[cfgType] = IdleConfParser(defCfgFiles[cfgType]) self.userCfg[cfgType] = IdleUserConfParser(usrCfgFiles[cfgType]) def GetUserCfgDir(self): """Return a filesystem directory for storing user config files. Creates it if required. """ cfgDir = '.idlerc' userDir = os.path.expanduser('~') if userDir != '~': # expanduser() found user home dir if not os.path.exists(userDir): warn = ('\n Warning: os.path.expanduser("~") points to\n ' + userDir + ',\n but the path does not exist.') try: print(warn, file=sys.stderr) except OSError: pass userDir = '~' if userDir == "~": # still no path to home! # traditionally IDLE has defaulted to os.getcwd(), is this adequate? userDir = os.getcwd() userDir = os.path.join(userDir, cfgDir) if not os.path.exists(userDir): try: os.mkdir(userDir) except OSError: warn = ('\n Warning: unable to create user config directory\n' + userDir + '\n Check path and permissions.\n Exiting!\n') print(warn, file=sys.stderr) raise SystemExit # TODO continue without userDIr instead of exit return userDir def GetOption(self, configType, section, option, default=None, type=None, warn_on_default=True, raw=False): """Return a value for configType section option, or default. If type is not None, return a value of that type. Also pass raw to the config parser. First try to return a valid value (including type) from a user configuration. If that fails, try the default configuration. If that fails, return default, with a default of None. Warn if either user or default configurations have an invalid value. Warn if default is returned and warn_on_default is True. """ try: if self.userCfg[configType].has_option(section, option): return self.userCfg[configType].Get(section, option, type=type, raw=raw) except ValueError: warning = ('\n Warning: configHandler.py - IdleConf.GetOption -\n' ' invalid %r value for configuration option %r\n' ' from section %r: %r' % (type, option, section, self.userCfg[configType].Get(section, option, raw=raw))) try: print(warning, file=sys.stderr) except OSError: pass try: if self.defaultCfg[configType].has_option(section,option): return self.defaultCfg[configType].Get( section, option, type=type, raw=raw) except ValueError: pass #returning default, print warning if warn_on_default: warning = ('\n Warning: configHandler.py - IdleConf.GetOption -\n' ' problem retrieving configuration option %r\n' ' from section %r.\n' ' returning default value: %r' % (option, section, default)) try: print(warning, file=sys.stderr) except OSError: pass return default def SetOption(self, configType, section, option, value): """Set section option to value in user config file.""" self.userCfg[configType].SetOption(section, option, value) def GetSectionList(self, configSet, configType): """Return sections for configSet configType configuration. configSet must be either 'user' or 'default' configType must be in self.config_types. """ if not (configType in self.config_types): raise InvalidConfigType('Invalid configType specified') if configSet == 'user': cfgParser = self.userCfg[configType] elif configSet == 'default': cfgParser=self.defaultCfg[configType] else: raise InvalidConfigSet('Invalid configSet specified') return cfgParser.sections() def GetHighlight(self, theme, element, fgBg=None): """Return individual theme element highlight color(s). fgBg - string ('fg' or 'bg') or None. If None, return a dictionary containing fg and bg colors with keys 'foreground' and 'background'. Otherwise, only return fg or bg color, as specified. Colors are intended to be appropriate for passing to Tkinter in, e.g., a tag_config call). """ if self.defaultCfg['highlight'].has_section(theme): themeDict = self.GetThemeDict('default', theme) else: themeDict = self.GetThemeDict('user', theme) fore = themeDict[element + '-foreground'] if element == 'cursor': # There is no config value for cursor bg back = themeDict['normal-background'] else: back = themeDict[element + '-background'] highlight = {"foreground": fore, "background": back} if not fgBg: # Return dict of both colors return highlight else: # Return specified color only if fgBg == 'fg': return highlight["foreground"] if fgBg == 'bg': return highlight["background"] else: raise InvalidFgBg('Invalid fgBg specified') def GetThemeDict(self, type, themeName): """Return {option:value} dict for elements in themeName. type - string, 'default' or 'user' theme type themeName - string, theme name Values are loaded over ultimate fallback defaults to guarantee that all theme elements are present in a newly created theme. """ if type == 'user': cfgParser = self.userCfg['highlight'] elif type == 'default': cfgParser = self.defaultCfg['highlight'] else: raise InvalidTheme('Invalid theme type specified') # Provide foreground and background colors for each theme # element (other than cursor) even though some values are not # yet used by idle, to allow for their use in the future. # Default values are generally black and white. # TODO copy theme from a class attribute. theme ={'normal-foreground':'#000000', 'normal-background':'#ffffff', 'keyword-foreground':'#000000', 'keyword-background':'#ffffff', 'builtin-foreground':'#000000', 'builtin-background':'#ffffff', 'comment-foreground':'#000000', 'comment-background':'#ffffff', 'string-foreground':'#000000', 'string-background':'#ffffff', 'definition-foreground':'#000000', 'definition-background':'#ffffff', 'hilite-foreground':'#000000', 'hilite-background':'gray', 'break-foreground':'#ffffff', 'break-background':'#000000', 'hit-foreground':'#ffffff', 'hit-background':'#000000', 'error-foreground':'#ffffff', 'error-background':'#000000', #cursor (only foreground can be set) 'cursor-foreground':'#000000', #shell window 'stdout-foreground':'#000000', 'stdout-background':'#ffffff', 'stderr-foreground':'#000000', 'stderr-background':'#ffffff', 'console-foreground':'#000000', 'console-background':'#ffffff' } for element in theme: if not cfgParser.has_option(themeName, element): # Print warning that will return a default color warning = ('\n Warning: configHandler.IdleConf.GetThemeDict' ' -\n problem retrieving theme element %r' '\n from theme %r.\n' ' returning default color: %r' % (element, themeName, theme[element])) try: print(warning, file=sys.stderr) except OSError: pass theme[element] = cfgParser.Get( themeName, element, default=theme[element]) return theme def CurrentTheme(self): """Return the name of the currently active text color theme. idlelib.config-main.def includes this section [Theme] default= 1 name= IDLE Classic name2= # name2 set in user config-main.cfg for themes added after 2015 Oct 1 Item name2 is needed because setting name to a new builtin causes older IDLEs to display multiple error messages or quit. See https://bugs.python.org/issue25313. When default = True, name2 takes precedence over name, while older IDLEs will just use name. """ default = self.GetOption('main', 'Theme', 'default', type='bool', default=True) if default: theme = self.GetOption('main', 'Theme', 'name2', default='') if default and not theme or not default: theme = self.GetOption('main', 'Theme', 'name', default='') source = self.defaultCfg if default else self.userCfg if source['highlight'].has_section(theme): return theme else: return "IDLE Classic" def CurrentKeys(self): "Return the name of the currently active key set." return self.GetOption('main', 'Keys', 'name', default='') def GetExtensions(self, active_only=True, editor_only=False, shell_only=False): """Return extensions in default and user config-extensions files. If active_only True, only return active (enabled) extensions and optionally only editor or shell extensions. If active_only False, return all extensions. """ extns = self.RemoveKeyBindNames( self.GetSectionList('default', 'extensions')) userExtns = self.RemoveKeyBindNames( self.GetSectionList('user', 'extensions')) for extn in userExtns: if extn not in extns: #user has added own extension extns.append(extn) if active_only: activeExtns = [] for extn in extns: if self.GetOption('extensions', extn, 'enable', default=True, type='bool'): #the extension is enabled if editor_only or shell_only: # TODO if both, contradictory if editor_only: option = "enable_editor" else: option = "enable_shell" if self.GetOption('extensions', extn,option, default=True, type='bool', warn_on_default=False): activeExtns.append(extn) else: activeExtns.append(extn) return activeExtns else: return extns def RemoveKeyBindNames(self, extnNameList): "Return extnNameList with keybinding section names removed." # TODO Easier to return filtered copy with list comp names = extnNameList kbNameIndicies = [] for name in names: if name.endswith(('_bindings', '_cfgBindings')): kbNameIndicies.append(names.index(name)) kbNameIndicies.sort(reverse=True) for index in kbNameIndicies: #delete each keybinding section name del(names[index]) return names def GetExtnNameForEvent(self, virtualEvent): """Return the name of the extension binding virtualEvent, or None. virtualEvent - string, name of the virtual event to test for, without the enclosing '<< >>' """ extName = None vEvent = '<<' + virtualEvent + '>>' for extn in self.GetExtensions(active_only=0): for event in self.GetExtensionKeys(extn): if event == vEvent: extName = extn # TODO return here? return extName def GetExtensionKeys(self, extensionName): """Return dict: {configurable extensionName event : active keybinding}. Events come from default config extension_cfgBindings section. Keybindings come from GetCurrentKeySet() active key dict, where previously used bindings are disabled. """ keysName = extensionName + '_cfgBindings' activeKeys = self.GetCurrentKeySet() extKeys = {} if self.defaultCfg['extensions'].has_section(keysName): eventNames = self.defaultCfg['extensions'].GetOptionList(keysName) for eventName in eventNames: event = '<<' + eventName + '>>' binding = activeKeys[event] extKeys[event] = binding return extKeys def __GetRawExtensionKeys(self,extensionName): """Return dict {configurable extensionName event : keybinding list}. Events come from default config extension_cfgBindings section. Keybindings list come from the splitting of GetOption, which tries user config before default config. """ keysName = extensionName+'_cfgBindings' extKeys = {} if self.defaultCfg['extensions'].has_section(keysName): eventNames = self.defaultCfg['extensions'].GetOptionList(keysName) for eventName in eventNames: binding = self.GetOption( 'extensions', keysName, eventName, default='').split() event = '<<' + eventName + '>>' extKeys[event] = binding return extKeys def GetExtensionBindings(self, extensionName): """Return dict {extensionName event : active or defined keybinding}. Augment self.GetExtensionKeys(extensionName) with mapping of non- configurable events (from default config) to GetOption splits, as in self.__GetRawExtensionKeys. """ bindsName = extensionName + '_bindings' extBinds = self.GetExtensionKeys(extensionName) #add the non-configurable bindings if self.defaultCfg['extensions'].has_section(bindsName): eventNames = self.defaultCfg['extensions'].GetOptionList(bindsName) for eventName in eventNames: binding = self.GetOption( 'extensions', bindsName, eventName, default='').split() event = '<<' + eventName + '>>' extBinds[event] = binding return extBinds def GetKeyBinding(self, keySetName, eventStr): """Return the keybinding list for keySetName eventStr. keySetName - name of key binding set (config-keys section). eventStr - virtual event, including brackets, as in '<<event>>'. """ eventName = eventStr[2:-2] #trim off the angle brackets binding = self.GetOption('keys', keySetName, eventName, default='').split() return binding def GetCurrentKeySet(self): "Return CurrentKeys with 'darwin' modifications." result = self.GetKeySet(self.CurrentKeys()) if sys.platform == "darwin": # OS X Tk variants do not support the "Alt" keyboard modifier. # So replace all keybingings that use "Alt" with ones that # use the "Option" keyboard modifier. # TODO (Ned?): the "Option" modifier does not work properly for # Cocoa Tk and XQuartz Tk so we should not use it # in default OS X KeySets. for k, v in result.items(): v2 = [ x.replace('<Alt-', '<Option-') for x in v ] if v != v2: result[k] = v2 return result def GetKeySet(self, keySetName): """Return event-key dict for keySetName core plus active extensions. If a binding defined in an extension is already in use, the extension binding is disabled by being set to '' """ keySet = self.GetCoreKeys(keySetName) activeExtns = self.GetExtensions(active_only=1) for extn in activeExtns: extKeys = self.__GetRawExtensionKeys(extn) if extKeys: #the extension defines keybindings for event in extKeys: if extKeys[event] in keySet.values(): #the binding is already in use extKeys[event] = '' #disable this binding keySet[event] = extKeys[event] #add binding return keySet def IsCoreBinding(self, virtualEvent): """Return True if the virtual event is one of the core idle key events. virtualEvent - string, name of the virtual event to test for, without the enclosing '<< >>' """ return ('<<'+virtualEvent+'>>') in self.GetCoreKeys() # TODO make keyBindins a file or class attribute used for test above # and copied in function below def GetCoreKeys(self, keySetName=None): """Return dict of core virtual-key keybindings for keySetName. The default keySetName None corresponds to the keyBindings base dict. If keySetName is not None, bindings from the config file(s) are loaded _over_ these defaults, so if there is a problem getting any core binding there will be an 'ultimate last resort fallback' to the CUA-ish bindings defined here. """ keyBindings={ '<<copy>>': ['<Control-c>', '<Control-C>'], '<<cut>>': ['<Control-x>', '<Control-X>'], '<<paste>>': ['<Control-v>', '<Control-V>'], '<<beginning-of-line>>': ['<Control-a>', '<Home>'], '<<center-insert>>': ['<Control-l>'], '<<close-all-windows>>': ['<Control-q>'], '<<close-window>>': ['<Alt-F4>'], '<<do-nothing>>': ['<Control-x>'], '<<end-of-file>>': ['<Control-d>'], '<<python-docs>>': ['<F1>'], '<<python-context-help>>': ['<Shift-F1>'], '<<history-next>>': ['<Alt-n>'], '<<history-previous>>': ['<Alt-p>'], '<<interrupt-execution>>': ['<Control-c>'], '<<view-restart>>': ['<F6>'], '<<restart-shell>>': ['<Control-F6>'], '<<open-class-browser>>': ['<Alt-c>'], '<<open-module>>': ['<Alt-m>'], '<<open-new-window>>': ['<Control-n>'], '<<open-window-from-file>>': ['<Control-o>'], '<<plain-newline-and-indent>>': ['<Control-j>'], '<<print-window>>': ['<Control-p>'], '<<redo>>': ['<Control-y>'], '<<remove-selection>>': ['<Escape>'], '<<save-copy-of-window-as-file>>': ['<Alt-Shift-S>'], '<<save-window-as-file>>': ['<Alt-s>'], '<<save-window>>': ['<Control-s>'], '<<select-all>>': ['<Alt-a>'], '<<toggle-auto-coloring>>': ['<Control-slash>'], '<<undo>>': ['<Control-z>'], '<<find-again>>': ['<Control-g>', '<F3>'], '<<find-in-files>>': ['<Alt-F3>'], '<<find-selection>>': ['<Control-F3>'], '<<find>>': ['<Control-f>'], '<<replace>>': ['<Control-h>'], '<<goto-line>>': ['<Alt-g>'], '<<smart-backspace>>': ['<Key-BackSpace>'], '<<newline-and-indent>>': ['<Key-Return>', '<Key-KP_Enter>'], '<<smart-indent>>': ['<Key-Tab>'], '<<indent-region>>': ['<Control-Key-bracketright>'], '<<dedent-region>>': ['<Control-Key-bracketleft>'], '<<comment-region>>': ['<Alt-Key-3>'], '<<uncomment-region>>': ['<Alt-Key-4>'], '<<tabify-region>>': ['<Alt-Key-5>'], '<<untabify-region>>': ['<Alt-Key-6>'], '<<toggle-tabs>>': ['<Alt-Key-t>'], '<<change-indentwidth>>': ['<Alt-Key-u>'], '<<del-word-left>>': ['<Control-Key-BackSpace>'], '<<del-word-right>>': ['<Control-Key-Delete>'] } if keySetName: for event in keyBindings: binding = self.GetKeyBinding(keySetName, event) if binding: keyBindings[event] = binding else: #we are going to return a default, print warning warning=('\n Warning: configHandler.py - IdleConf.GetCoreKeys' ' -\n problem retrieving key binding for event %r' '\n from key set %r.\n' ' returning default value: %r' % (event, keySetName, keyBindings[event])) try: print(warning, file=sys.stderr) except OSError: pass return keyBindings def GetExtraHelpSourceList(self, configSet): """Return list of extra help sources from a given configSet. Valid configSets are 'user' or 'default'. Return a list of tuples of the form (menu_item , path_to_help_file , option), or return the empty list. 'option' is the sequence number of the help resource. 'option' values determine the position of the menu items on the Help menu, therefore the returned list must be sorted by 'option'. """ helpSources = [] if configSet == 'user': cfgParser = self.userCfg['main'] elif configSet == 'default': cfgParser = self.defaultCfg['main'] else: raise InvalidConfigSet('Invalid configSet specified') options=cfgParser.GetOptionList('HelpFiles') for option in options: value=cfgParser.Get('HelpFiles', option, default=';') if value.find(';') == -1: #malformed config entry with no ';' menuItem = '' #make these empty helpPath = '' #so value won't be added to list else: #config entry contains ';' as expected value=value.split(';') menuItem=value[0].strip() helpPath=value[1].strip() if menuItem and helpPath: #neither are empty strings helpSources.append( (menuItem,helpPath,option) ) helpSources.sort(key=lambda x: x[2]) return helpSources def GetAllExtraHelpSourcesList(self): """Return a list of the details of all additional help sources. Tuples in the list are those of GetExtraHelpSourceList. """ allHelpSources = (self.GetExtraHelpSourceList('default') + self.GetExtraHelpSourceList('user') ) return allHelpSources def GetFont(self, root, configType, section): """Retrieve a font from configuration (font, font-size, font-bold) Intercept the special value 'TkFixedFont' and substitute the actual font, factoring in some tweaks if needed for appearance sakes. The 'root' parameter can normally be any valid Tkinter widget. Return a tuple (family, size, weight) suitable for passing to tkinter.Font """ family = self.GetOption(configType, section, 'font', default='courier') size = self.GetOption(configType, section, 'font-size', type='int', default='10') bold = self.GetOption(configType, section, 'font-bold', default=0, type='bool') if (family == 'TkFixedFont'): if TkVersion < 8.5: family = 'Courier' else: f = Font(name='TkFixedFont', exists=True, root=root) actualFont = Font.actual(f) family = actualFont['family'] size = actualFont['size'] if size < 0: size = 10 # if font in pixels, ignore actual size bold = actualFont['weight']=='bold' return (family, size, 'bold' if bold else 'normal') def LoadCfgFiles(self): "Load all configuration files." for key in self.defaultCfg: self.defaultCfg[key].Load() self.userCfg[key].Load() #same keys def SaveUserCfgFiles(self): "Write all loaded user configuration files to disk." for key in self.userCfg: self.userCfg[key].Save() idleConf = IdleConf() # TODO Revise test output, write expanded unittest ### module test if __name__ == '__main__': def dumpCfg(cfg): print('\n', cfg, '\n') for key in cfg: sections = cfg[key].sections() print(key) print(sections) for section in sections: options = cfg[key].options(section) print(section) print(options) for option in options: print(option, '=', cfg[key].Get(section, option)) dumpCfg(idleConf.defaultCfg) dumpCfg(idleConf.userCfg) print(idleConf.userCfg['main'].Get('Theme', 'name')) #print idleConf.userCfg['highlight'].GetDefHighlight('Foo','normal') Back

Edit File : configHandler.py | Size : 31.44 KB

"""Provides access to stored IDLE configuration information.

Refer to the comments at the beginning of config-main.def for a description of
the available configuration files and the design implemented to update user
configuration information.  In particular, user configuration choices which
duplicate the defaults will be removed from the user's configuration files,
and if a file becomes empty, it will be deleted.

The contents of the user files may be altered using the Options/Configure IDLE
menu to access the configuration GUI (configDialog.py), or manually.

Throughout this module there is an emphasis on returning useable defaults
when a problem occurs in returning a requested configuration value back to
idle. This is to allow IDLE to continue to function in spite of errors in
the retrieval of config information. When a default is returned instead of
a requested config value, a message is printed to stderr to aid in
configuration problem notification and resolution.
"""
# TODOs added Oct 2014, tjr

import os
import sys

from configparser import ConfigParser
from tkinter import TkVersion
from tkinter.font import Font, nametofont

class InvalidConfigType(Exception): pass
class InvalidConfigSet(Exception): pass
class InvalidFgBg(Exception): pass
class InvalidTheme(Exception): pass

class IdleConfParser(ConfigParser):
    """
    A ConfigParser specialised for idle configuration file handling
    """
    def __init__(self, cfgFile, cfgDefaults=None):
        """
        cfgFile - string, fully specified configuration file name
        """
        self.file = cfgFile
        ConfigParser.__init__(self, defaults=cfgDefaults, strict=False)

def Get(self, section, option, type=None, default=None, raw=False):
        """
        Get an option value for given section/option or return default.
        If type is specified, return as type.
        """
        # TODO Use default as fallback, at least if not None
        # Should also print Warning(file, section, option).
        # Currently may raise ValueError
        if not self.has_option(section, option):
            return default
        if type == 'bool':
            return self.getboolean(section, option)
        elif type == 'int':
            return self.getint(section, option)
        else:
            return self.get(section, option, raw=raw)

def GetOptionList(self, section):
        "Return a list of options for given section, else []."
        if self.has_section(section):
            return self.options(section)
        else:  #return a default value
            return []

def Load(self):
        "Load the configuration file from disk."
        self.read(self.file)

class IdleUserConfParser(IdleConfParser):
    """
    IdleConfigParser specialised for user configuration handling.
    """

def AddSection(self, section):
        "If section doesn't exist, add it."
        if not self.has_section(section):
            self.add_section(section)

def RemoveEmptySections(self):
        "Remove any sections that have no options."
        for section in self.sections():
            if not self.GetOptionList(section):
                self.remove_section(section)

def IsEmpty(self):
        "Return True if no sections after removing empty sections."
        self.RemoveEmptySections()
        return not self.sections()

def RemoveOption(self, section, option):
        """Return True if option is removed from section, else False.

False if either section does not exist or did not have option.
        """
        if self.has_section(section):
            return self.remove_option(section, option)
        return False

def SetOption(self, section, option, value):
        """Return True if option is added or changed to value, else False.

Add section if required.  False means option already had value.
        """
        if self.has_option(section, option):
            if self.get(section, option) == value:
                return False
            else:
                self.set(section, option, value)
                return True
        else:
            if not self.has_section(section):
                self.add_section(section)
            self.set(section, option, value)
            return True

def RemoveFile(self):
        "Remove user config file self.file from disk if it exists."
        if os.path.exists(self.file):
            os.remove(self.file)

def Save(self):
        """Update user configuration file.

Remove empty sections. If resulting config isn't empty, write the file
        to disk. If config is empty, remove the file from disk if it exists.

"""
        if not self.IsEmpty():
            fname = self.file
            try:
                cfgFile = open(fname, 'w')
            except OSError:
                os.unlink(fname)
                cfgFile = open(fname, 'w')
            with cfgFile:
                self.write(cfgFile)
        else:
            self.RemoveFile()

class IdleConf:
    """Hold config parsers for all idle config files in singleton instance.

Default config files, self.defaultCfg --
        for config_type in self.config_types:
            (idle install dir)/config-{config-type}.def

User config files, self.userCfg --
        for config_type in self.config_types:
        (user home dir)/.idlerc/config-{config-type}.cfg
    """
    def __init__(self):
        self.config_types = ('main', 'extensions', 'highlight', 'keys')
        self.defaultCfg = {}
        self.userCfg = {}
        self.cfg = {}  # TODO use to select userCfg vs defaultCfg
        self.CreateConfigHandlers()
        self.LoadCfgFiles()

def CreateConfigHandlers(self):
        "Populate default and user config parser dictionaries."
        #build idle install path
        if __name__ != '__main__': # we were imported
            idleDir=os.path.dirname(__file__)
        else: # we were exec'ed (for testing only)
            idleDir=os.path.abspath(sys.path[0])
        userDir=self.GetUserCfgDir()

defCfgFiles = {}
        usrCfgFiles = {}
        # TODO eliminate these temporaries by combining loops
        for cfgType in self.config_types: #build config file names
            defCfgFiles[cfgType] = os.path.join(
                    idleDir, 'config-' + cfgType + '.def')
            usrCfgFiles[cfgType] = os.path.join(
                    userDir, 'config-' + cfgType + '.cfg')
        for cfgType in self.config_types: #create config parsers
            self.defaultCfg[cfgType] = IdleConfParser(defCfgFiles[cfgType])
            self.userCfg[cfgType] = IdleUserConfParser(usrCfgFiles[cfgType])

def GetUserCfgDir(self):
        """Return a filesystem directory for storing user config files.

Creates it if required.
        """
        cfgDir = '.idlerc'
        userDir = os.path.expanduser('~')
        if userDir != '~': # expanduser() found user home dir
            if not os.path.exists(userDir):
                warn = ('\n Warning: os.path.expanduser("~") points to\n ' +
                        userDir + ',\n but the path does not exist.')
                try:
                    print(warn, file=sys.stderr)
                except OSError:
                    pass
                userDir = '~'
        if userDir == "~": # still no path to home!
            # traditionally IDLE has defaulted to os.getcwd(), is this adequate?
            userDir = os.getcwd()
        userDir = os.path.join(userDir, cfgDir)
        if not os.path.exists(userDir):
            try:
                os.mkdir(userDir)
            except OSError:
                warn = ('\n Warning: unable to create user config directory\n' +
                        userDir + '\n Check path and permissions.\n Exiting!\n')
                print(warn, file=sys.stderr)
                raise SystemExit
        # TODO continue without userDIr instead of exit
        return userDir

def GetOption(self, configType, section, option, default=None, type=None,
                  warn_on_default=True, raw=False):
        """Return a value for configType section option, or default.

If type is not None, return a value of that type.  Also pass raw
        to the config parser.  First try to return a valid value
        (including type) from a user configuration. If that fails, try
        the default configuration. If that fails, return default, with a
        default of None.

Warn if either user or default configurations have an invalid value.
        Warn if default is returned and warn_on_default is True.
        """
        try:
            if self.userCfg[configType].has_option(section, option):
                return self.userCfg[configType].Get(section, option,
                                                    type=type, raw=raw)
        except ValueError:
            warning = ('\n Warning: configHandler.py - IdleConf.GetOption -\n'
                       ' invalid %r value for configuration option %r\n'
                       ' from section %r: %r' %
                       (type, option, section,
                       self.userCfg[configType].Get(section, option, raw=raw)))
            try:
                print(warning, file=sys.stderr)
            except OSError:
                pass
        try:
            if self.defaultCfg[configType].has_option(section,option):
                return self.defaultCfg[configType].Get(
                        section, option, type=type, raw=raw)
        except ValueError:
            pass
        #returning default, print warning
        if warn_on_default:
            warning = ('\n Warning: configHandler.py - IdleConf.GetOption -\n'
                       ' problem retrieving configuration option %r\n'
                       ' from section %r.\n'
                       ' returning default value: %r' %
                       (option, section, default))
            try:
                print(warning, file=sys.stderr)
            except OSError:
                pass
        return default

def SetOption(self, configType, section, option, value):
        """Set section option to value in user config file."""
        self.userCfg[configType].SetOption(section, option, value)

def GetSectionList(self, configSet, configType):
        """Return sections for configSet configType configuration.

configSet must be either 'user' or 'default'
        configType must be in self.config_types.
        """
        if not (configType in self.config_types):
            raise InvalidConfigType('Invalid configType specified')
        if configSet == 'user':
            cfgParser = self.userCfg[configType]
        elif configSet == 'default':
            cfgParser=self.defaultCfg[configType]
        else:
            raise InvalidConfigSet('Invalid configSet specified')
        return cfgParser.sections()

def GetHighlight(self, theme, element, fgBg=None):
        """Return individual theme element highlight color(s).

fgBg - string ('fg' or 'bg') or None.
        If None, return a dictionary containing fg and bg colors with
        keys 'foreground' and 'background'.  Otherwise, only return
        fg or bg color, as specified.  Colors are intended to be
        appropriate for passing to Tkinter in, e.g., a tag_config call).
        """
        if self.defaultCfg['highlight'].has_section(theme):
            themeDict = self.GetThemeDict('default', theme)
        else:
            themeDict = self.GetThemeDict('user', theme)
        fore = themeDict[element + '-foreground']
        if element == 'cursor':  # There is no config value for cursor bg
            back = themeDict['normal-background']
        else:
            back = themeDict[element + '-background']
        highlight = {"foreground": fore, "background": back}
        if not fgBg:  # Return dict of both colors
            return highlight
        else:  # Return specified color only
            if fgBg == 'fg':
                return highlight["foreground"]
            if fgBg == 'bg':
                return highlight["background"]
            else:
                raise InvalidFgBg('Invalid fgBg specified')

def GetThemeDict(self, type, themeName):
        """Return {option:value} dict for elements in themeName.

type - string, 'default' or 'user' theme type
        themeName - string, theme name
        Values are loaded over ultimate fallback defaults to guarantee
        that all theme elements are present in a newly created theme.
        """
        if type == 'user':
            cfgParser = self.userCfg['highlight']
        elif type == 'default':
            cfgParser = self.defaultCfg['highlight']
        else:
            raise InvalidTheme('Invalid theme type specified')
        # Provide foreground and background colors for each theme
        # element (other than cursor) even though some values are not
        # yet used by idle, to allow for their use in the future.
        # Default values are generally black and white.
        # TODO copy theme from a class attribute.
        theme ={'normal-foreground':'#000000',
                'normal-background':'#ffffff',
                'keyword-foreground':'#000000',
                'keyword-background':'#ffffff',
                'builtin-foreground':'#000000',
                'builtin-background':'#ffffff',
                'comment-foreground':'#000000',
                'comment-background':'#ffffff',
                'string-foreground':'#000000',
                'string-background':'#ffffff',
                'definition-foreground':'#000000',
                'definition-background':'#ffffff',
                'hilite-foreground':'#000000',
                'hilite-background':'gray',
                'break-foreground':'#ffffff',
                'break-background':'#000000',
                'hit-foreground':'#ffffff',
                'hit-background':'#000000',
                'error-foreground':'#ffffff',
                'error-background':'#000000',
                #cursor (only foreground can be set)
                'cursor-foreground':'#000000',
                #shell window
                'stdout-foreground':'#000000',
                'stdout-background':'#ffffff',
                'stderr-foreground':'#000000',
                'stderr-background':'#ffffff',
                'console-foreground':'#000000',
                'console-background':'#ffffff' }
        for element in theme:
            if not cfgParser.has_option(themeName, element):
                # Print warning that will return a default color
                warning = ('\n Warning: configHandler.IdleConf.GetThemeDict'
                           ' -\n problem retrieving theme element %r'
                           '\n from theme %r.\n'
                           ' returning default color: %r' %
                           (element, themeName, theme[element]))
                try:
                    print(warning, file=sys.stderr)
                except OSError:
                    pass
            theme[element] = cfgParser.Get(
                    themeName, element, default=theme[element])
        return theme

def CurrentTheme(self):
        """Return the name of the currently active text color theme.

idlelib.config-main.def includes this section
        [Theme]
        default= 1
        name= IDLE Classic
        name2=
        # name2 set in user config-main.cfg for themes added after 2015 Oct 1

Item name2 is needed because setting name to a new builtin
        causes older IDLEs to display multiple error messages or quit.
        See https://bugs.python.org/issue25313.
        When default = True, name2 takes precedence over name,
        while older IDLEs will just use name.
        """
        default = self.GetOption('main', 'Theme', 'default',
                                 type='bool', default=True)
        if default:
            theme = self.GetOption('main', 'Theme', 'name2', default='')
        if default and not theme or not default:
            theme = self.GetOption('main', 'Theme', 'name', default='')
        source = self.defaultCfg if default else self.userCfg
        if source['highlight'].has_section(theme):
            return theme
        else:
            return "IDLE Classic"

def CurrentKeys(self):
        "Return the name of the currently active key set."
        return self.GetOption('main', 'Keys', 'name', default='')

def GetExtensions(self, active_only=True, editor_only=False, shell_only=False):
        """Return extensions in default and user config-extensions files.

If active_only True, only return active (enabled) extensions
        and optionally only editor or shell extensions.
        If active_only False, return all extensions.
        """
        extns = self.RemoveKeyBindNames(
                self.GetSectionList('default', 'extensions'))
        userExtns = self.RemoveKeyBindNames(
                self.GetSectionList('user', 'extensions'))
        for extn in userExtns:
            if extn not in extns: #user has added own extension
                extns.append(extn)
        if active_only:
            activeExtns = []
            for extn in extns:
                if self.GetOption('extensions', extn, 'enable', default=True,
                                  type='bool'):
                    #the extension is enabled
                    if editor_only or shell_only:  # TODO if both, contradictory
                        if editor_only:
                            option = "enable_editor"
                        else:
                            option = "enable_shell"
                        if self.GetOption('extensions', extn,option,
                                          default=True, type='bool',
                                          warn_on_default=False):
                            activeExtns.append(extn)
                    else:
                        activeExtns.append(extn)
            return activeExtns
        else:
            return extns

def RemoveKeyBindNames(self, extnNameList):
        "Return extnNameList with keybinding section names removed."
        # TODO Easier to return filtered copy with list comp
        names = extnNameList
        kbNameIndicies = []
        for name in names:
            if name.endswith(('_bindings', '_cfgBindings')):
                kbNameIndicies.append(names.index(name))
        kbNameIndicies.sort(reverse=True)
        for index in kbNameIndicies: #delete each keybinding section name
            del(names[index])
        return names

def GetExtnNameForEvent(self, virtualEvent):
        """Return the name of the extension binding virtualEvent, or None.

virtualEvent - string, name of the virtual event to test for,
                       without the enclosing '<< >>'
        """
        extName = None
        vEvent = '<<' + virtualEvent + '>>'
        for extn in self.GetExtensions(active_only=0):
            for event in self.GetExtensionKeys(extn):
                if event == vEvent:
                    extName = extn  # TODO return here?
        return extName

def GetExtensionKeys(self, extensionName):
        """Return dict: {configurable extensionName event : active keybinding}.

Events come from default config extension_cfgBindings section.
        Keybindings come from GetCurrentKeySet() active key dict,
        where previously used bindings are disabled.
        """
        keysName = extensionName + '_cfgBindings'
        activeKeys = self.GetCurrentKeySet()
        extKeys = {}
        if self.defaultCfg['extensions'].has_section(keysName):
            eventNames = self.defaultCfg['extensions'].GetOptionList(keysName)
            for eventName in eventNames:
                event = '<<' + eventName + '>>'
                binding = activeKeys[event]
                extKeys[event] = binding
        return extKeys

def __GetRawExtensionKeys(self,extensionName):
        """Return dict {configurable extensionName event : keybinding list}.

Events come from default config extension_cfgBindings section.
        Keybindings list come from the splitting of GetOption, which
        tries user config before default config.
        """
        keysName = extensionName+'_cfgBindings'
        extKeys = {}
        if self.defaultCfg['extensions'].has_section(keysName):
            eventNames = self.defaultCfg['extensions'].GetOptionList(keysName)
            for eventName in eventNames:
                binding = self.GetOption(
                        'extensions', keysName, eventName, default='').split()
                event = '<<' + eventName + '>>'
                extKeys[event] = binding
        return extKeys

def GetExtensionBindings(self, extensionName):
        """Return dict {extensionName event : active or defined keybinding}.

Augment self.GetExtensionKeys(extensionName) with mapping of non-
        configurable events (from default config) to GetOption splits,
        as in self.__GetRawExtensionKeys.
        """
        bindsName = extensionName + '_bindings'
        extBinds = self.GetExtensionKeys(extensionName)
        #add the non-configurable bindings
        if self.defaultCfg['extensions'].has_section(bindsName):
            eventNames = self.defaultCfg['extensions'].GetOptionList(bindsName)
            for eventName in eventNames:
                binding = self.GetOption(
                        'extensions', bindsName, eventName, default='').split()
                event = '<<' + eventName + '>>'
                extBinds[event] = binding

return extBinds

def GetKeyBinding(self, keySetName, eventStr):
        """Return the keybinding list for keySetName eventStr.

keySetName - name of key binding set (config-keys section).
        eventStr - virtual event, including brackets, as in '<<event>>'.
        """
        eventName = eventStr[2:-2] #trim off the angle brackets
        binding = self.GetOption('keys', keySetName, eventName, default='').split()
        return binding

def GetCurrentKeySet(self):
        "Return CurrentKeys with 'darwin' modifications."
        result = self.GetKeySet(self.CurrentKeys())

if sys.platform == "darwin":
            # OS X Tk variants do not support the "Alt" keyboard modifier.
            # So replace all keybingings that use "Alt" with ones that
            # use the "Option" keyboard modifier.
            # TODO (Ned?): the "Option" modifier does not work properly for
            #        Cocoa Tk and XQuartz Tk so we should not use it
            #        in default OS X KeySets.
            for k, v in result.items():
                v2 = [ x.replace('<Alt-', '<Option-') for x in v ]
                if v != v2:
                    result[k] = v2

return result

def GetKeySet(self, keySetName):
        """Return event-key dict for keySetName core plus active extensions.

If a binding defined in an extension is already in use, the
        extension binding is disabled by being set to ''
        """
        keySet = self.GetCoreKeys(keySetName)
        activeExtns = self.GetExtensions(active_only=1)
        for extn in activeExtns:
            extKeys = self.__GetRawExtensionKeys(extn)
            if extKeys: #the extension defines keybindings
                for event in extKeys:
                    if extKeys[event] in keySet.values():
                        #the binding is already in use
                        extKeys[event] = '' #disable this binding
                    keySet[event] = extKeys[event] #add binding
        return keySet

def IsCoreBinding(self, virtualEvent):
        """Return True if the virtual event is one of the core idle key events.

virtualEvent - string, name of the virtual event to test for,
                       without the enclosing '<< >>'
        """
        return ('<<'+virtualEvent+'>>') in self.GetCoreKeys()

# TODO make keyBindins a file or class attribute used for test above
# and copied in function below

def GetCoreKeys(self, keySetName=None):
        """Return dict of core virtual-key keybindings for keySetName.

The default keySetName None corresponds to the keyBindings base
        dict. If keySetName is not None, bindings from the config
        file(s) are loaded _over_ these defaults, so if there is a
        problem getting any core binding there will be an 'ultimate last
        resort fallback' to the CUA-ish bindings defined here.
        """
        keyBindings={
            '<<copy>>': ['<Control-c>', '<Control-C>'],
            '<<cut>>': ['<Control-x>', '<Control-X>'],
            '<<paste>>': ['<Control-v>', '<Control-V>'],
            '<<beginning-of-line>>': ['<Control-a>', '<Home>'],
            '<<center-insert>>': ['<Control-l>'],
            '<<close-all-windows>>': ['<Control-q>'],
            '<<close-window>>': ['<Alt-F4>'],
            '<<do-nothing>>': ['<Control-x>'],
            '<<end-of-file>>': ['<Control-d>'],
            '<<python-docs>>': ['<F1>'],
            '<<python-context-help>>': ['<Shift-F1>'],
            '<<history-next>>': ['<Alt-n>'],
            '<<history-previous>>': ['<Alt-p>'],
            '<<interrupt-execution>>': ['<Control-c>'],
            '<<view-restart>>': ['<F6>'],
            '<<restart-shell>>': ['<Control-F6>'],
            '<<open-class-browser>>': ['<Alt-c>'],
            '<<open-module>>': ['<Alt-m>'],
            '<<open-new-window>>': ['<Control-n>'],
            '<<open-window-from-file>>': ['<Control-o>'],
            '<<plain-newline-and-indent>>': ['<Control-j>'],
            '<<print-window>>': ['<Control-p>'],
            '<<redo>>': ['<Control-y>'],
            '<<remove-selection>>': ['<Escape>'],
            '<<save-copy-of-window-as-file>>': ['<Alt-Shift-S>'],
            '<<save-window-as-file>>': ['<Alt-s>'],
            '<<save-window>>': ['<Control-s>'],
            '<<select-all>>': ['<Alt-a>'],
            '<<toggle-auto-coloring>>': ['<Control-slash>'],
            '<<undo>>': ['<Control-z>'],
            '<<find-again>>': ['<Control-g>', '<F3>'],
            '<<find-in-files>>': ['<Alt-F3>'],
            '<<find-selection>>': ['<Control-F3>'],
            '<<find>>': ['<Control-f>'],
            '<<replace>>': ['<Control-h>'],
            '<<goto-line>>': ['<Alt-g>'],
            '<<smart-backspace>>': ['<Key-BackSpace>'],
            '<<newline-and-indent>>': ['<Key-Return>', '<Key-KP_Enter>'],
            '<<smart-indent>>': ['<Key-Tab>'],
            '<<indent-region>>': ['<Control-Key-bracketright>'],
            '<<dedent-region>>': ['<Control-Key-bracketleft>'],
            '<<comment-region>>': ['<Alt-Key-3>'],
            '<<uncomment-region>>': ['<Alt-Key-4>'],
            '<<tabify-region>>': ['<Alt-Key-5>'],
            '<<untabify-region>>': ['<Alt-Key-6>'],
            '<<toggle-tabs>>': ['<Alt-Key-t>'],
            '<<change-indentwidth>>': ['<Alt-Key-u>'],
            '<<del-word-left>>': ['<Control-Key-BackSpace>'],
            '<<del-word-right>>': ['<Control-Key-Delete>']
            }
        if keySetName:
            for event in keyBindings:
                binding = self.GetKeyBinding(keySetName, event)
                if binding:
                    keyBindings[event] = binding
                else: #we are going to return a default, print warning
                    warning=('\n Warning: configHandler.py - IdleConf.GetCoreKeys'
                               ' -\n problem retrieving key binding for event %r'
                               '\n from key set %r.\n'
                               ' returning default value: %r' %
                               (event, keySetName, keyBindings[event]))
                    try:
                        print(warning, file=sys.stderr)
                    except OSError:
                        pass
        return keyBindings

def GetExtraHelpSourceList(self, configSet):
        """Return list of extra help sources from a given configSet.

Valid configSets are 'user' or 'default'.  Return a list of tuples of
        the form (menu_item , path_to_help_file , option), or return the empty
        list.  'option' is the sequence number of the help resource.  'option'
        values determine the position of the menu items on the Help menu,
        therefore the returned list must be sorted by 'option'.

"""
        helpSources = []
        if configSet == 'user':
            cfgParser = self.userCfg['main']
        elif configSet == 'default':
            cfgParser = self.defaultCfg['main']
        else:
            raise InvalidConfigSet('Invalid configSet specified')
        options=cfgParser.GetOptionList('HelpFiles')
        for option in options:
            value=cfgParser.Get('HelpFiles', option, default=';')
            if value.find(';') == -1: #malformed config entry with no ';'
                menuItem = '' #make these empty
                helpPath = '' #so value won't be added to list
            else: #config entry contains ';' as expected
                value=value.split(';')
                menuItem=value[0].strip()
                helpPath=value[1].strip()
            if menuItem and helpPath: #neither are empty strings
                helpSources.append( (menuItem,helpPath,option) )
        helpSources.sort(key=lambda x: x[2])
        return helpSources

def GetAllExtraHelpSourcesList(self):
        """Return a list of the details of all additional help sources.

Tuples in the list are those of GetExtraHelpSourceList.
        """
        allHelpSources = (self.GetExtraHelpSourceList('default') +
                self.GetExtraHelpSourceList('user') )
        return allHelpSources

def GetFont(self, root, configType, section):
        """Retrieve a font from configuration (font, font-size, font-bold)
        Intercept the special value 'TkFixedFont' and substitute
        the actual font, factoring in some tweaks if needed for
        appearance sakes.

The 'root' parameter can normally be any valid Tkinter widget.

Return a tuple (family, size, weight) suitable for passing
        to tkinter.Font
        """
        family = self.GetOption(configType, section, 'font', default='courier')
        size = self.GetOption(configType, section, 'font-size', type='int',
                              default='10')
        bold = self.GetOption(configType, section, 'font-bold', default=0,
                              type='bool')
        if (family == 'TkFixedFont'):
            if TkVersion < 8.5:
                family = 'Courier'
            else:
                f = Font(name='TkFixedFont', exists=True, root=root)
                actualFont = Font.actual(f)
                family = actualFont['family']
                size = actualFont['size']
                if size < 0:
                    size = 10  # if font in pixels, ignore actual size
                bold = actualFont['weight']=='bold'
        return (family, size, 'bold' if bold else 'normal')

def LoadCfgFiles(self):
        "Load all configuration files."
        for key in self.defaultCfg:
            self.defaultCfg[key].Load()
            self.userCfg[key].Load() #same keys

def SaveUserCfgFiles(self):
        "Write all loaded user configuration files to disk."
        for key in self.userCfg:
            self.userCfg[key].Save()

idleConf = IdleConf()

# TODO Revise test output, write expanded unittest
### module test
if __name__ == '__main__':
    def dumpCfg(cfg):
        print('\n', cfg, '\n')
        for key in cfg:
            sections = cfg[key].sections()
            print(key)
            print(sections)
            for section in sections:
                options = cfg[key].options(section)
                print(section)
                print(options)
                for option in options:
                    print(option, '=', cfg[key].Get(section, option))
    dumpCfg(idleConf.defaultCfg)
    dumpCfg(idleConf.userCfg)
    print(idleConf.userCfg['main'].Get('Theme', 'name'))
    #print idleConf.userCfg['highlight'].GetDefHighlight('Foo','normal')

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