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stem.py
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stem.py
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def contains_vowel(s):
vowels=['a','e','i','o','u']
while 'y' in s:
i=s.index('y')
if s[i-1] not in vowels:
return True
for ch in s:
if ch in vowels:
return True
return False
def get_measure(s):
vowels=['a','e','i','o','u']
l=""
is_vowel=False
switch=False
if s[0] in vowels:
is_vowel=True
l+="V"
else:
is_vowel=False
l+="C"
for i in range(1,len(s)):
if s[i]=='y':
if s[i-1] not in vowels:
switch=True
is_vowel=True
else:
if s[i] in vowels:
if is_vowel is False: switch=True
is_vowel=True
else:
if is_vowel is True: switch=True
is_vowel=False
if switch is True:
if l[-1]=='C':l+="V"
else: l+="C"
switch=False
if l[0]=='C':
if len(l)%2==0:m=(len(l)-2)/2
else:m=(len(l)-1)/2
else:
if len(l)%2==0:m=len(l)/2
else:m=(len(l)-1)/2
return m
def step_1a(s,m):
if len(s)>4 and s[len(s)-4:len(s)]=='sses':
s=s[0:len(s)-4]+"ss"
elif len(s)>3 and s[len(s)-3:len(s)]=='ies':
s=s[0:len(s)-3]+"i"
elif len(s)>2 and s[len(s)-2:len(s)]=='ss':
s=s[0:len(s)-2]+"ss"
elif len(s)>1 and s[len(s)-1:len(s)]=='s':
s=s[0:len(s)-1]
return s
def step_1b(s,m):
if m>0:
if len(s)>3 and s[len(s)-3:len(s)]=='eed':
s=s[0:len(s)-3]+'ee'
if len(s)>2 and s[len(s)-2:len(s)]=='ed':
l=s[0:len(s)-2]
if contains_vowel(l):
s=l
if len(s)>3 and s[len(s)-3:len(s)]=='ing':
l=s[0:len(s)-3]
if contains_vowel(l):
s=l
return s
def step_2(s,m):
if m>0:
if len(s)>7:
dict={'ational':'ate',
'ization':'ize',
'iveness':'ive',
'fulness':'ful',
'ousness':'ous'}
if s[len(s)-7:len(s)] in dict:
s=s[0:len(s)-7]+dict[s[len(s)-7:len(s)]]
if len(s)>6:
dict={'tional':'tion',
'ation':'ate',
'bility':'ble',
'ality':'al'}
if s[len(s)-6:len(s)] in dict:
s=s[0:len(s)-6]+dict[s[len(s)-6:len(s)]]
if len(s)>5:
dict={'entli':'ent',
'ously':'ous',
'alism':'al',
'ality':'al',
'ivity':'ive'}
if s[len(s)-5:len(s)] in dict:
s=s[0:len(s)-5]+dict[s[len(s)-5:len(s)]]
if len(s)>4:
dict={'ency':'ence',
'ancy':'ance',
'ably':'able',
'ally':'al',
'ator':'ate'}
if s[len(s)-4:len(s)] in dict:
s=s[0:len(s)-4]+dict[s[len(s)-4:len(s)]]
if len(s)>3:
if s[len(s)-3:len(s)]=='ely':
s=s[0:len(s)-4]+"e"
return s
def step_3(s,m):
if m>0:
if len(s)>5:
dict={'icate':'ic',
'ative':'',
'alize':'al',
'iciti':'ic'}
if s[len(s)-5:len(s)] in dict:
s=s[0:len(s)-5]+dict[s[len(s)-5:len(s)]]
if len(s)>4:
if s[len(s)-4:len(s)]=='ical':
s=s[0:len(s)-4]+"ic"
if s[len(s)-4:len(s)]=='ness':
s=s[0:len(s)-4]
if s[len(s)-4:len(s)]=='iful':
s=s[0:len(s)-4]+'y'
if len(s)>3:
if s[len(s)-3:len(s)]=='ful':
s=s[0:len(s)-3]
return s
def step_4(s,m):
if m>1:
if len(s)>5:
if s[len(s)-5:len(s)]=='ement':
s=s[0:len(s)-5]
if len(s)>4:
dict=['ance','ence','able','ible','ment','tion','sion']
if s[len(s)-4:len(s)] in dict:
s=s[0:len(s)-4]
if len(s)>3:
dict=['ant','ent','ism','ate','iti','ous','ive','ize']
if s[len(s)-3:len(s)] in dict:
s=s[0:len(s)-3]
if len(s)>2:
if s[len(s)-2:len(s)]=='ou':
s=s[0:len(s)-2]
return s
def step_5a(s,m):
if m>1:
if len(s)>1:
if s[-1]=='e':
s=s[0:len(s)-1]
if m==1 and len(s)>2 and s[-2]!='o' and s[-1]=='e':
s=s[0:len(s)-1]
return s
def step_5b(s,m):
if m>1:
if len(s)>1:
if s[-1]=='l' or s[-1]=='d':
s=s[0:len(s)-1]
return s
def stem(s):
m=get_measure(s)
s=step_1a(s,m)
#print s
s=step_1b(s,m)
#print s
s=step_2(s,m)
#print s
s=step_3(s,m)
#print s
s=step_4(s,m)
#print s
s=step_5a(s,m)
#print s
s=step_5b(s,m)
print s
return s