[Sync Iteration] python/pig-latin/2

Author: exercism-solutions-syncer[bot]

solutions/python/pig-latin/2/pig_latin.py

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+"""
+The task is to translate text from English to Pig Latin.
+The translation is defined using four rules, which look at the pattern of vowels
+and consonants at the beginning of a word. These rules look at each word's use
+of vowels and consonants:
+
+vowels: the letters a, e, i, o, and u
+consonants: the other 21 letters of the English alphabet
+"""
+
+
+def translate(text: str) -> str:
+    """
+    Translate text from English to Pig Latin.
+
+    :param text:
+    :return:
+    """
+    words: list = text.split(' ')
+    return " ".join(process_text(word) for word in words)
+
+
+def process_text(text: str) -> str:
+    # Rule 1
+    # If a word begins with a vowel,
+    # or starts with "xr" or "yt",
+    # add an "ay" sound to the end of the word.
+    if is_rule_1(text):
+        return text + 'ay'
+
+    # Rule 2
+    # If a word begins with one or more consonants, first move those consonants
+    # to the end of the word and then add an "ay" sound to the end of the word.
+    if is_rule_2(text):
+        i = get_last_consonant_indx(text)
+        return text[i + 1:] + text[: i + 1] + 'ay'
+
+    # Rule 3
+    # If a word starts with zero or more consonants followed by "qu", first move
+    # those consonants (if any) and the "qu" part to the end of the word, and then
+    # add an "ay" sound to the end of the word.
+    if is_rule_3(text):
+        i = text.index('qu')
+        return text[i + 2:] + text[:i + 2] + 'ay'
+
+    # Rule 4
+    # If a word starts with one or more consonants followed by "y", first move the
+    # consonants preceding the "y" to the end of the word, and then add an "ay" sound
+    # to the end of the word.
+    if is_rule_4(text):
+        i = text.index('y')
+        return text[i:] + text[:i] + 'ay'
+
+
+def is_rule_1(text: str) -> bool:
+    """
+    Check if a word begins with a vowel, or starts with "xr" or "yt".
+
+    :param text:
+    :return:
+    """
+    if is_vowel(text[0]):
+        return True
+    if text[:2] in ("xr", "yt"):
+        return True
+    return False
+
+
+def is_rule_2(text: str) -> bool:
+    """
+    Check ff a word begins with one or more consonants.
+    No 'qu' or 'y' in it.
+
+    :param text:
+    :return:
+    """
+    return is_consonant(text[0]) and not is_rule_3(text) and not is_rule_4(text)
+
+
+def is_rule_3(text: str) -> bool:
+    """
+    Check if a word starts with zero or more consonants followed by "qu".
+
+    :param text:
+    :return:
+    """
+    if 'qu' in text:
+        if text[:2] == 'qu':
+            return True
+
+        for char in text[:text.index('qu')]:
+            if is_vowel(char):
+                return False
+        return True
+    return False
+
+
+def is_rule_4(text: str) -> bool:
+    """
+    Check if a word starts with one or more consonants followed by "y".
+
+    :param text:
+    :return:
+    """
+    if 'y' in text and text[0] != 'y':
+        for char in text[:text.index('y')]:
+            if is_vowel(char):
+                return False
+        return True
+    return False
+
+
+def is_vowel(char: str) -> bool:
+    """
+    Test that char in vowels: the letters a, e, i, o, and u.
+
+    :param char:
+    :return:
+    """
+    return char in "aeiou"
+
+
+def is_consonant(char: str) -> bool:
+    """
+    Check that char is consonant (the other 21 letters of the English alphabet).
+
+    :param char:
+    :return:
+    """
+    return char.isalpha() and not is_vowel(char)
+
+
+def get_last_consonant_indx(text: str) -> int:
+    """
+
+    :param text:
+    :return:
+    """
+    i = 0
+    for i, char in enumerate(text):
+        if is_consonant(char):
+            i += 1
+        else:
+            break
+
+    return i - 1