Initial commit.

wordle.py

@@ -0,0 +1,223 @@
+#!/usr/bin/python
+
+import random
+import string
+
+from enum import Enum
+from collections import defaultdict
+
+WORDLE_LENGTH = 5
+
+
+class LetterResult(Enum):
+    """Is an individual letter in a word in the result?"""
+    CORRECT = 1
+    MOVE = 2
+    INCORRECT = 3
+    UNKNOWN = 4
+
+
+class InvalidWord(Exception):
+    """Thrown when an input word is not a valid Wordle."""
+    pass
+
+
+_wordle_dictionary = set()
+
+
+_invalid_words = set(['staia', 'erept', 'boily', 'bolty', 'pindy', 'hyrse', 'hirse', 'retan', 'sisel', 'skeel', 'telae', 'genae', 'beata', 'beala', 'macco', 'beele', 'divet', 'vedet', 'stail', 'roter'])
+
+
+def dictionary():
+    if not _wordle_dictionary:
+        with open('words_alpha.txt') as word_file:
+            all_words = word_file.read().split()
+        _wordle_dictionary.update(
+            filter(lambda w: len(w) == WORDLE_LENGTH and w not in _invalid_words, all_words))
+
+    return _wordle_dictionary
+
+
+def select_word():
+    return random.choice(list(dictionary()))
+
+
+def grade_word(target, guess):
+    # We don't check word length, since all valid words are 5 letters.
+    if guess not in dictionary():
+        raise InvalidWord(f"{guess} is not a valid Wordle.")
+
+    result = [LetterResult.UNKNOWN] * WORDLE_LENGTH
+
+    # We copy target, and remove letters if we find them. This handles duplicate letters correctly.
+    # For example, if the target is "pulls" and we guess "apple", only the first "p" should be a
+    # MOVE. The second should be INCORRECT.
+    remaining = list(target)
+
+    # Find all correct results first.
+    for i in range(WORDLE_LENGTH):
+        if target[i] == guess[i]:
+            result[i] = LetterResult.CORRECT
+            remaining.remove(guess[i])
+
+    for i in range(WORDLE_LENGTH):
+        if result[i] == LetterResult.UNKNOWN:
+            if guess[i] in remaining:
+                # Letter is in the wrong place.
+                result[i] = LetterResult.MOVE
+                remaining.remove(guess[i])
+            else:
+                # Letter is not in target.
+                result[i] = LetterResult.INCORRECT
+
+    return result
+
+
+def display_result(result, text):
+    opening = {
+        LetterResult.CORRECT: '\033[92m',
+        LetterResult.MOVE: '\033[33m',
+        LetterResult.INCORRECT: '\033[36m',
+        LetterResult.UNKNOWN: '',
+    }
+    closing = '\033[0m'
+
+    return f"{opening[result]}{text}{closing}"
+
+
+def success_result(result):
+    for r in result:
+        if r != LetterResult.CORRECT:
+            return False
+
+    return True
+
+
+def analyze_dictionary(wordle_dictionary):
+    # Word Position, Letter: Count
+    position_matches = [defaultdict(int),
+                        defaultdict(int),
+                        defaultdict(int),
+                        defaultdict(int),
+                        defaultdict(int)]
+
+    # Letter: Count
+    word_matches = defaultdict(int)
+
+    for word in wordle_dictionary:
+        unique_letters = set(word)
+        for letter in unique_letters:
+            word_matches[letter] += 1
+
+        for index in range(len(word)):
+            letter = word[index]
+            assert (letter in string.ascii_lowercase)
+            position_matches[index][letter] += 1
+
+    return position_matches, word_matches
+
+
+def score_word(position_matches, word_matches, word):
+    result = 0
+
+    # Green Score
+    for index in range(len(word)):
+        letter = word[index]
+        green_score = position_matches[index][letter]
+        result += 10 * green_score
+
+    # Yellow Score
+    for letter in set(word):
+        yellow_score = word_matches[letter]
+        result += yellow_score
+
+    return result
+
+
+def scored_words(wordle_dictionary=dictionary()):
+    # word: score
+    scored_words = dict()
+
+    position_matches, word_matches = analyze_dictionary(wordle_dictionary)
+
+    for word in wordle_dictionary:
+        scored_words[word] = score_word(position_matches, word_matches, word)
+
+    result = list(wordle_dictionary)
+    result.sort(key=lambda word: scored_words[word], reverse=True)
+
+    return [(word, scored_words[word]) for word in result]
+
+
+class Constraints():
+    correct = [None] * WORDLE_LENGTH  # Letter is None, or known.
+    # Sets of letters that must be elsewhere
+    move = defaultdict(set)
+    min = defaultdict(int)
+    exact = set()
+
+    # List of LetterResult values.
+    def update_graded(self, guess, grade):
+
+        guess = guess.lower()
+
+        new_min = defaultdict(int)
+        new_exact = set()
+
+        for i, letter in enumerate(guess):
+            match grade[i]:
+                case LetterResult.CORRECT:
+                    self.correct[i] = letter
+                    new_min[letter] += 1
+                case LetterResult.MOVE:
+                    self.move[letter].add(i)
+                    new_min[letter] += 1
+                case LetterResult.INCORRECT:
+                    new_exact.add(letter)
+                    new_min[letter] += 0  # Ensure letter is in min.
+
+        for letter, m in new_min.items():
+            self.min[letter] = max(m, self.min[letter])
+
+        self.exact |= new_exact
+
+    def matches(self, guess):
+
+        counts = defaultdict(int)
+
+        # All known correct letters in place.
+        for i, letter in enumerate(guess):
+            if self.correct[i] and self.correct[i] != letter:
+                return False  # If it's incorrect, the word is incorrect.
+
+            # Any MOVE letters in known wrong locations.
+            if letter in self.move:
+                if i in self.move[letter]:
+                    return False
+
+            counts[letter] += 1
+
+        for letter, min in self.min.items():
+            if letter in self.exact:
+                if counts[letter] != min:
+                    return False
+            else:
+                if counts[letter] < min:
+                    return False
+
+        return True
+
+
+def filter_dictionary(constraints, wordle_dictionary=dictionary()):
+    return set(filter(lambda w: constraints.matches(w), wordle_dictionary))
+
+
+if __name__ == '__main__':
+    constraints = Constraints()
+    constraints.update_graded('cares', [LetterResult.INCORRECT, LetterResult.INCORRECT, LetterResult.MOVE, LetterResult.CORRECT, LetterResult.INCORRECT])
+    constraints.update_graded('rover', [LetterResult.INCORRECT, LetterResult.CORRECT, LetterResult.MOVE, LetterResult.CORRECT, LetterResult.CORRECT])
+    constraints.update_graded('vomer', [LetterResult.CORRECT, LetterResult.CORRECT, LetterResult.INCORRECT, LetterResult.CORRECT, LetterResult.CORRECT])
+
+    valid_words = filter_dictionary(constraints)
+
+    print("Top: ", scored_words(valid_words)[:1])