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#!/usr/bin/env python3
###########################################################################
# script name: ch-2.py #
# #
# https://github.com/user-person #
# #
# https://perlweeklychallenge.org/blog/perl-weekly-challenge-053/ #
# #
# Vowel Strings #
# #
# Write a script to accept an integer 1 <= N <= 5 that would print all #
# possible strings of size N formed by using only vowels (a, e, i, o, u). #
# The string should follow the following rules: #
# #
# 1. 'a' can only be followed by 'e' and 'i'. #
# 2. 'e' can only be followed by 'i'. #
# 3. 'i' can only be followed by 'a', 'e', 'o', and 'u'. #
# 4. 'o' can only be followed by 'a' and 'u'. #
# 5. 'u' can only be followed by 'o' and 'e'. #
# #
###########################################################################
import os
import re
import sys
# https://is.gd/lOmciv
def toStr(n,base):
convertString = "01234"
if n < base:
return convertString[n]
else:
return toStr(n//base,base) + convertString[n%base]
scriptName = os.path.basename(sys.argv[0])
num = 0
try:
num = int(sys.argv[1])
except IndexError:
sys.stderr.write(scriptName + ' requires an argument. Argument should be 1 <= n <= 5\n')
exit(1)
if num < 1 or num > 5:
sys.stderr.write('Invalid choice. Argument should be 1 <= n <= 5\n')
exit(1)
vowels = ( 'a', 'e', 'i', 'o', 'u')
MAX = int('4' * num,5)
j = 0
for i in range(0,MAX):
j = int(toStr(i,5))
j = '{number:0{size}d}'.format(number=j,size=num)
string = ''
for k in str(j):
string += vowels[int(k)]
if re.search(r'a[^ei]',string) \
or re.search(r'e[^i]',string) \
or re.search(r'o[^au]',string) \
or re.search(r'i[^aeou]',string) \
or re.search(r'u[^oe]',string):
continue
else:
print(string)
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