rename dtk -> dcd

dcd/cfg.py

@@ -0,0 +1,100 @@
+#! /usr/bin/env python3
+# encoding: utf-8
+
+import jsmin
+import json
+
+class Config:
+	"""
+	A hierarchical key-value container that can be loaded from JSON or a Python dict.
+	
+	Any contained dicts are automatically converted to Config instances as well.
+	
+	Supports sequential overwriting - so one can load a default config and then
+	progressively overwrite it with overlays:
+	
+	
+	
+	
+	
+	
+	
+	>>> raw
+{'a': 1, 'b': {'ba': 2, 'bb': 3, 'bc': {'bca': None}}, 'c': 4}
+>>> overlay
+{'b': {'bc': {'bca': 42}}}
+
+	
+	
+	while stack:
+	current = stack[-1]
+	
+	...
+	
+	stack.pop()
+
+for key in overlay.keys():
+	
+	
+	
+	"""
+	
+	def __init__(self, d, readonly=False):
+		assert type(d) == dict
+		object.__setattr__(self, "raw", d)
+		object.__setattr__(self, "readonly", readonly)
+	
+	@classmethod
+	def from_file(cls, path, readonly=False):
+		with open(path) as f:
+			initial = json.loads(jsmin.jsmin(f.read()))
+		
+		return cls(initial, readonly)
+	
+	def update(self, d):
+		
+	
+	def keys(self):
+		return self.raw.keys()
+	
+	def values(self):
+		return self.raw.values()
+	
+	def items(self):
+		return self.raw.items()
+	
+	def __getitem__(self, name):
+		return self.raw[name]
+	
+	def __setitem__(self, name, value):
+		if self.readonly:
+			raise AttributeError("config is read-only")
+		
+		self.raw[name] = value
+	
+	def __setattr__(self, name, value):
+		if self.readonly:
+			raise AttributeError("config is read-only")
+		
+		self.raw[name] = value
+	
+	def __getattr__(self, name):
+		matches = [key for key in self.raw if key.replace("-", "_") == name]
+		
+		if matches:
+			assert len(matches) == 1
+			
+			value = self.raw[matches[0]]
+			
+			if type(value) == dict:
+				return Config(value)
+			else:
+				return value
+		else:
+			raise KeyError(name)
+	
+	def __contains__(self, name):
+		return name in self.raw
+	
+	def __repr__(self):
+		return "Config(%s)" %(" ".join("%s=%s" %(k, "…" if type(v) == dict else v) for k, v in self.raw.items()))