spelling_diacritics.py

def is_diacritics_correct(word):
  diaeresis_chars = 'ϊϋΐΰ'
  vowels_with_accent = 'άέήίόύώ'
  diphthongs = ['αι', 'ει', 'οι', 'υι', 'αυ', 'ευ', 'ου']

  once = False
  for i, char in enumerate(word):
    if char in diaeresis_chars:
      if once:
        return False
      once = True
      # Rule 1: Check if the preceding vowel is stressed.
      if i >= 1 and word[i-1] in vowels_with_accent:
        return False

      # Rule 2: Check if there's a diphthong before the diacritics.
      # (Accented diphthongs are caught by the previous rule.)
      if i >= 2 and word[i-2:i] in diphthongs:
        return False

      # Rule 3: Check if there's no diphthong in the word.
      # Only consider vowel combinations ending in ι or υ (e.g., ηυ, ιυ, ωυ, ηι, ωι).
      if i >= 1 and ((char in 'ϊΐ' and word[i-1] in 'ηω') or \
          (char in 'ϋΰ' and word[i-1] in 'ηιω')):
        return False
  # If none of the rules apply, diacritics might be necessary.
  return True


# Test examples (Correct)
words = ["νεράιδα", "άυλος", "δρύινος", "πλάι", "κορόιδεψα", "Μάιος", "τέιον",
         "αρτοποιία", "υιικός", "πιγκουίνος", "παλαιικός", "αλληλούια", "θειικός",
         "Πομπηία", "Μωυσής", "διυλιστήριο", "πρωί", "πρωινός", "ζωικός", "ηρωικός"
         "αϊδεύω", "παϊδάκια", "Μαΐου", "θεϊκός", "ευφυΐα", "ευνοϊκός", "ναυσιπλοΐα",
         "κοροϊδεύω", "μυϊκός", "προϋπηρεσία", "εμποροϋπάλληλος", "καταπραϋντικός",
         "Ταΰγετος", "ξεϋφαίνω"]

# # Test the function
# words = [
#   'νεράιδα',  # Correct
#   'άυλος',    # Correct
#   'πλάι',     # Correct
#   'Μάιος',    # Correct
#   'αρτοποιΐα', # Incorrect: Rule 2
#   'πιγκουΐνος', # Incorrect: Rule 2
#   'Πομπηΐα',  # Incorrect: Rule 3
#   'Μωϋσής',   # Incorrect: Rule 3
#   'πρωΐ',     # Incorrect: Rule 3
#   'προΐκα',   # Incorrect: None of the rules apply
#   'ηρωΐκός',  # Incorrect: Rule 3
# ]

for word in words:
  print(f"{word}: {'Correctly spelled' if is_diacritics_correct(word) else 'Misspelled'}")