Alt-Alt State Stack.ipynb

{
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   "outputs": [
    {
     "ename": "AttributeError",
     "evalue": "'StateStack' object has no attribute 'push_state'",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mAttributeError\u001b[0m                            Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-1-70b70b38eea2>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[1;32m     49\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m     50\u001b[0m \u001b[0mctx\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mContext\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m---> 51\u001b[0;31m \u001b[0mctx\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mfill\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[0;32m<ipython-input-1-70b70b38eea2>\u001b[0m in \u001b[0;36mfill\u001b[0;34m(self, *args)\u001b[0m\n\u001b[1;32m     39\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m     40\u001b[0m     \u001b[0;32mdef\u001b[0m \u001b[0mfill\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mself\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m*\u001b[0m\u001b[0margs\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m---> 41\u001b[0;31m         \u001b[0;32mwith\u001b[0m \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mstatetracker\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mpush_state\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"fill\"\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mcolor\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mstate\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m     42\u001b[0m             \u001b[0mcolor\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mColor\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mself\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m*\u001b[0m\u001b[0margs\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m     43\u001b[0m             \u001b[0;32mreturn\u001b[0m \u001b[0mcolor\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
      "\u001b[0;31mAttributeError\u001b[0m: 'StateStack' object has no attribute 'push_state'"
     ]
    }
   ],
   "source": [
    "from contextlib import contextmanager\n",
    "\n",
    "class State:\n",
    "    def __init__(self, name, data):\n",
    "        self.name = name\n",
    "        self.data = data\n",
    "        \n",
    "    def __enter__(self):\n",
    "        pass\n",
    "    \n",
    "    def __exit__(self, *args):\n",
    "        pass\n",
    "\n",
    "class StateStack:\n",
    "    def __init__(self, *states):\n",
    "        self.current_state_name = None\n",
    "        for name in states:\n",
    "            setattr(self, name, [])\n",
    "        \n",
    "    @contextmanager\n",
    "    def usa(name, value):\n",
    "        self.current_state_name = name\n",
    "        stack = getattr(self, name)\n",
    "        stack.push(value)\n",
    "        \n",
    "    def save(self, data, name):\n",
    "        print(name, self.current_state_name)\n",
    "        stack = getattr(self, name)\n",
    "        stack[-1][name] = data\n",
    "        \n",
    "class Color:\n",
    "    def __init__(self, context, *args):\n",
    "        self._state = context.statetracker.save({\"mode\": \"rgba\", \"value\": args}, None)\n",
    "        self.rgba = args\n",
    "\n",
    "class Context:\n",
    "    def __init__(self):\n",
    "        self.statetracker = StateStack(\"fill\", \"stroke\")\n",
    "        \n",
    "    def fill(self, *args):\n",
    "        with self.statetracker.push_state(\"fill\", color.state):\n",
    "            color = Color(self, *args)\n",
    "            return color\n",
    "    \n",
    "    def stroke(self, *args):\n",
    "        with self.statetracker.push_state(\"stroke\", color.state):\n",
    "            color = Color(self, *args)\n",
    "            return color    \n",
    "    \n",
    "ctx = Context()\n",
    "ctx.fill()"
   ]
  }
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