Алгорифмы Маркова

markov.ipynb

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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Алгорифмы Маркова"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Простецкая штука чтобы не считать все самому"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "from typing import Tuple, List, Set\n",
    "\n",
    "\n",
    "Alphabet = Set[str]\n",
    "Rule = Tuple[str, str]\n",
    "\n",
    "\n",
    "class Algorithm:\n",
    "    def __init__(self,\n",
    "                 R: List[Rule],\n",
    "                 S='.'):\n",
    "        self._rules = R\n",
    "        self._stop = S\n",
    "        \n",
    "    def __call__(self,\n",
    "                 word: str,\n",
    "                 verbose=False):\n",
    "        while True:\n",
    "            backup = word\n",
    "            for a, b in self._rules:\n",
    "                new_word = word.replace(a, b, 1)\n",
    "                if new_word != word:\n",
    "                    word = new_word\n",
    "                    if verbose:\n",
    "                        self._log(word, (a, b))\n",
    "                    break\n",
    "            if backup == word:\n",
    "                break\n",
    "            if self._stop in word:\n",
    "                word = word.replace(self._stop, '', 1)\n",
    "                break\n",
    "        return word\n",
    "    \n",
    "    def _log(self,\n",
    "             word: str,\n",
    "             rule: Rule):\n",
    "        a, b = rule\n",
    "        print(\"Правило:\", a, '->', b, sep=' ')\n",
    "        print(\"Слово:\", word, sep=' ')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Демонстрация:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Правило: aa -> *\n",
      "Слово: abb*bbaaaba\n",
      "Правило: b* -> *\n",
      "Слово: ab*bbaaaba\n",
      "Правило: b* -> *\n",
      "Слово: a*bbaaaba\n",
      "Правило: *b -> *\n",
      "Слово: a*baaaba\n",
      "Правило: *b -> *\n",
      "Слово: a*aaaba\n",
      "Правило: a* -> *\n",
      "Слово: *aaaba\n",
      "Правило: *a -> *\n",
      "Слово: *aaba\n",
      "Правило: *a -> *\n",
      "Слово: *aba\n",
      "Правило: *a -> *\n",
      "Слово: *ba\n",
      "Правило: *b -> *\n",
      "Слово: *a\n",
      "Правило: *a -> *\n",
      "Слово: *\n",
      "Правило: * -> .\n",
      "Слово: .\n",
      "\n"
     ]
    }
   ],
   "source": [
    "rules = [('b*', '*'),\n",
    "         ('*b', '*'),\n",
    "         ('a*', '*'),\n",
    "         ('*a', '*'),\n",
    "         ('aa', '*'),\n",
    "         ('*', '.')]\n",
    "\n",
    "a = Algorithm(rules)\n",
    "print(a('abbaabbaaaba', verbose=True))"
   ]
  }
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