Replaced with current version of Meh

Shared/Config.py

@@ -1,27 +1,38 @@
 from imp import load_source
 from os.path import isfile
+from marshal import dumps, loads
+from types import FunctionType
 
 
-class ValidationFailedError(Exception):
+class OptionDuplicateError(IndexError):
 	def __init__(self, name):
-		super(InputError, self).__init__("validation failed for '%s'" % name)
+		super(IndexError, self).__init__("'%s' already exists" % name)	
 
 
 class OptionNotFoundError(IndexError):
 	def __init__(self, name):
-		super(InputError, self).__init__("'%s' does not exist" % name)	
+		super(IndexError, self).__init__("'%s' does not exist" % name)	
+
+
+class NameMustBeStringError(Exception):
+	def __init__(self):
+		super(Exception, self).__init__("option names have to be strings")		
 
 
 def make_value(value):
 	if type(value) is str:
 		value = '"%s"' % value
-	elif type(value) in (list, tuple, tuple):
+	elif type(value) in (list, tuple, dict):
 		value = str(value)
+	elif type(value) is FunctionType:
+		value = dumps(value.__code__)
 	return value
 
 
 class Option:
 	def __init__(self, name, default_value, validator=None, comment=""):
+		if not type(name) is str:
+			raise NameMustBeStringError()
 		self.name = name
 		self.default_value = default_value
 		self.validator = validator
@@ -29,30 +40,52 @@ class Option:
 
 
 class Config:
-	def __init__(self, options=[]):
+	def __init__(self, options=[], validation_failed=None, override_on_error=False):
+		if type(options) in (list, tuple):
+			for option in options:
+				if not type(option) is Option:
+					raise TypeError("all options must be of type Option")
+		else:
+			raise TypeError("options must be a list or tuple containing options of type Option")
 		self.options = options
+		self.validation_failed = validation_failed
+		self.override_on_error = override_on_error
 
 
 	def read_from_file(self, file):
 		if isfile(file):
 			config = load_source("config", file)
+			error = False
 			for option in self.options:
-				found = False
+				# Make sure all options are avaliable
-				for attr in dir(config):
+				if option.name not in dir(config):
-					if not attr.startswith("__"):
+					setattr(config, option.name, option.default_value)
-						if option.name == attr:
+					error = True
-							found = True
+				else:
-							break
+					# Make sure all validators pass
-				if not found:
+					if option.validator != None:
+						value = getattr(config, option.name)
+						if not option.validator(value):
+							setattr(config, option.name, option.default_value)
+							if self.validation_failed != None:
+								self.validation_failed(option.name, value)
+							error = True
+				if self.override_on_error:
+					if error:
 						self.write_to_file(file)
-					return self.read_from_file(file)
 			return config
 		else:
 			raise FileNotFoundError()
 
 
-	def add(self, option):
+	def add(self, new_option):
-		self.options.append(option)
+		if type(new_option) is Option:
+			for option in self.options:
+				if new_option.name == option.name:
+					raise OptionDuplicateError(option.name)
+			self.options.append(new_option)
+		else:
+			raise TypeError("invalid type supplied")
 
 
 	def remove(self, option):
@@ -67,9 +100,17 @@ class Config:
 
 
 	def get(self):
+		contains_function = False
 		out = ""
 		for option in self.options:
-			out += "%s = %s %s\n" % (option.name, make_value(option.default_value), ("# %s" % option.comment) if option.comment else "")
+			value = make_value(option.default_value)
+			if type(option.default_value) is FunctionType:
+				if not contains_function:
+					out = "from marshal import loads; from types import FunctionType\n\n" + out
+					contains_function = True
+				value = 'FunctionType(loads(%s), globals(), "%s")' % (value, option.name)
+			out += "%s = %s%s\n" % (option.name, value, 
+				(" # %s" % option.comment) if option.comment else "")
 		return out