'''Pluralize English nouns (stage 2)

Command line usage:

$ python plural2.py noun

nouns

'''

import re

def match_sxz(noun):

return re.search('[sxz]$', noun)

def apply_sxz(noun):

return re.sub('$', 'es', noun)

def match_h(noun):

return re.search('[^aeioudgkprt]h$', noun)

def apply_h(noun):

return re.sub('$', 'es', noun)

def match_y(noun):

return re.search('[^aeiou]y$', noun)

def apply_y(noun):

return re.sub('y$', 'ies', noun)

def match_default(noun):

return True

def apply_default(noun):

return noun + 's'

rules = ((match_sxz, apply_sxz),

(match_h, apply_h),

(match_y, apply_y),

(match_default, apply_default)

)

def plural(noun):

for matches_rule, apply_rule in rules:

if matches_rule(noun):

return apply_rule(noun)

if __name__ == '__main__':

import sys

if sys.argv[1:]:

print(plural(sys.argv[1]))

else:

print(__doc__)

# Copyright (c) 2009, Mark Pilgrim, All rights reserved.

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