667 		layerNames = [layerName for layerName, directoryName in layerContents]
680 		for layerName, layerDirectory in layerContents:
682 				return layerName
686 	def getGlyphSet(self, layerName=None, validateRead=None, validateWrite=None):  argument
705 		if layerName is None:
706 			layerName = self.getDefaultLayerName(validate=validateRead)
710 			if layerName == storedLayerName:
714 			raise UFOLibError("No glyphs directory is mapped to \"%s\"." % layerName)
729 	def getCharacterMapping(self, layerName=None, validate=None):  argument
736 		glyphSet = self.getGlyphSet(layerName, validateRead=validate, validateWrite=True)
1401 			for layerName in layerOrder:
1402 				if layerName is None:
1403 					layerName = DEFAULT_LAYER_NAME
1404 				newOrder.append(layerName)
1410 		layerContents = [(layerName, self.layerContents[layerName]) for layerName in layerOrder]
1413 	def _findDirectoryForLayerName(self, layerName):  argument
1416 			if layerName is None and directoryName == DEFAULT_GLYPHS_DIRNAME:
1419 			elif existingLayerName == layerName:
1423 			raise UFOLibError("Could not locate a glyph set directory for the layer named %s." % layerName)
1428 		layerName=None,  argument
1459 			and (not defaultLayer or layerName is not None)
1465 		if layerName is None and defaultLayer:
1468 					layerName = existingLayerName
1469 			if layerName is None:
1470 				layerName = DEFAULT_LAYER_NAME
1471 		elif layerName is None and not defaultLayer:
1485 				layerName=layerName,
1516 		layerName=None,  argument
1529 					if existingLayerName != layerName:
1534 				elif existingLayerName == layerName:
1537 		if layerName in self.layerContents:
1538 			directory = self.layerContents[layerName]
1547 				directory = userNameToFileName(layerName, existing=existing, prefix="glyphs.")
1551 		self.layerContents[layerName] = directory
1562 	def renameGlyphSet(self, layerName, newLayerName, defaultLayer=False):  argument
1576 		if layerName == newLayerName:
1578 			if self.layerContents[layerName] != DEFAULT_GLYPHS_DIRNAME and not defaultLayer:
1581 			if self.layerContents[layerName] == DEFAULT_GLYPHS_DIRNAME and defaultLayer:
1593 		oldDirectory = self._findDirectoryForLayerName(layerName)
1600 		del self.layerContents[layerName]
1605 	def deleteGlyphSet(self, layerName):  argument
1613 		foundDirectory = self._findDirectoryForLayerName(layerName)
1615 		del self.layerContents[layerName]