add over.cfg.Config - a simple read-only API for JSON configs

over/__init__.py

@@ -6,6 +6,7 @@ import sys
 from . import app
 from . import aux
 from . import callback
+from . import cfg
 from . import cmd
 from . import docs
 from . import file

over/cfg.py

@@ -0,0 +1,69 @@
+#! /usr/bin/env python3
+# encoding: utf-8
+
+# --------------------------------------------------
+# Library imports
+import json
+import jsmin
+
+# --------------------------------------------------
+# Local imports
+
+# --------------------------------------------------
+
+class Config:
+	def __init__(self, source=None, readonly=False):
+		"""
+		Can be loaded from a JSON file (str path) or from a python dict.
+		"""
+		
+		if type(source) == str:
+			with open(source) as f:
+				initial = json.loads(jsmin.jsmin(f.read()))
+		elif source is None:
+			initial = {}
+		else:
+			initial = source
+		
+		assert type(initial) == dict
+		object.__setattr__(self, "raw", initial)
+		object.__setattr__(self, "readonly", readonly)
+	
+	def keys(self):
+		return self.raw.keys()
+	
+	def __getitem__(self, name):
+		return self.raw[name]
+	
+	def __setitem__(self, name, value):
+		if self.readonly:
+			raise AttributeError("object is not writable")
+		
+		self.raw[name] = value
+	
+	def __setattr__(self, name, value):
+		if self.readonly:
+			raise AttributeError("object is not writable")
+		
+		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()))