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#!/usr/bin/python2
import string
TRIPLES = {
'dge': 'j',
'dgi': 'j',
'dgy': 'j',
'sia': '+x',
'sio': '+x',
'tia': '+x',
'tio': '+x',
'tch': '',
'tha': '0',
'the': '0',
'thi': '0',
'tho': '0',
'thu': '0',
}
DOUBLES = {
'ph' : 'f',
'sh' : 'x'
}
SINGLETONS = {
'd': 't',
'f': 'f',
'j': 'j',
'l': 'l',
'm': 'm',
'n': 'n',
'r': 'r',
'p': 'p',
'q': 'k',
'v': 'f',
'x': 'ks',
'z': 's',
}
ALLCHARS = "".join(map(chr, range(256)))
NONLCCHARS = "".join([c for c in ALLCHARS if not c.islower()])
def metaphone(s):
s = s.lower()
s = s.translate(ALLCHARS, NONLCCHARS)
if not s: return ""
# If ae, gn, kn, pn, wr then drop the first letter.
if s[:2] in ("ae", "gn", "kn", "pn", "wr"):
s = s[1:]
# Change "x" to "s"
if s[0] == 'x':
x = "s%s" % s[1:]
# Get rid of "h" in "wh".
if s[:2] == 'wh':
s = "w%s" % s[1:]
# Get rid of s from end.
if s[-1] == 's':
s = s[:-1]
result = []
prevLtr = ' '
vowelBefore = 0
lastChar = len(s)-1
for idx in range(len(s)):
curLtr = s[idx]
# If first char is a vowel, keep it.
if curLtr in "aeiou":
if idx == 0:
result.append(curLtr)
continue
# Skip double letters.
if idx < lastChar:
if curLtr == s[idx+1]:
continue
try:
r = TRIPLES[s[idx:idx+3]]
if r == "+x":
if idx > 1:
result.append("x")
continue
else:
result.append(r)
continue
except KeyError:
pass
try:
r = DOUBLES[s[idx:idx+2]]
result.append(r)
continue
except KeyError:
pass
try:
r = SINGLETONS[s[idx]]
result.append(r)
continue
except KeyError:
pass
if idx > 0:
prevLtr = s[idx-1]
vowelBefore = prevLtr in "aeiou"
curLtr = s[idx]
nextLtr2 = nextLtr3 = ' '
if idx < lastChar:
nextLtr = s[idx+1]
vowelAfter = nextLtr in "aeiou"
frontvAfter = nextLtr in "eiy"
if idx+1 < lastChar:
nextLtr2 = s[idx+2]
if idx+2 < lastChar:
nextLtr3 = s[idx+3]
else:
nextLtr = ' '
vowelAfter = frontvAfter = 0
if curLtr == 'b':
if idx == lastChar and prevLtr == 'm':
pass
else:
result.append(curLtr)
elif curLtr == 'c':
# silent 'sci', 'sce, 'scy', 'sci', etc OK.
if not (prevLtr == 's' and frontvAfter):
if nextLtr in 'ia':
result.append("x")
elif frontvAfter:
result.append("s")
elif prevLtr == 's' and nextLtr == 'h':
result.append('k')
elif nextLtr == 'h':
if idx == 0 and nextLtr2 in "aeiou":
result.append('k')
else:
result.append('x')
elif prevLtr == 'c':
result.append('c')
else:
result.append('k')
elif curLtr == 'g':
if (idx < lastChar-1) and nextLtr == 'h':
pass
elif s[idx:] == 'gned':
pass
elif s[idx:] == 'gn':
pass
elif prevLtr == 'd' and frontvAfter:
pass
else:
hard = (prevLtr == 'g')
if frontvAfter and not hard:
result.append('j')
else:
result.append('k')
elif curLtr == 'h':
if prevLtr in 'csptg':
pass
elif vowelBefore and not vowelAfter:
pass
else:
result.append('h')
elif curLtr == 'k':
if prevLtr != 'c': result.append('k')
elif curLtr in 'wy':
if vowelAfter:
result.append(curLtr)
return "".join(result)
def demo(a):
print a, "=>", metaphone(a)
print __name__
if __name__ == '__main__':
demo("Nick. Mathewson")
demo("joe schmidt")
demo("Beethoven")
demo("Andrea Plaid")
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