gramps/src/soundex.py

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#
# Gramps - a GTK+/GNOME based genealogy program
#
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# Copyright (C) 2000-2003 Donald N. Allingham
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#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
"""
Provide soundex calculation
"""
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#-------------------------------------------------------------------------
#
# Standard python modules
#
#-------------------------------------------------------------------------
import string
import unicodedata
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#-------------------------------------------------------------------------
#
# constants
#
#-------------------------------------------------------------------------
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IGNORE = "HW~!@#$%^&*()_+=-`[]\|;:'/?.,<>\" \t\f\v"
TABLE = string.maketrans('ABCDEFGIJKLMNOPQRSTUVXYZ',
'012301202245501262301202')
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#-------------------------------------------------------------------------
#
# soundex - returns the soundex value for the specified string
#
#-------------------------------------------------------------------------
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def soundex(strval):
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"Return the soundex value to a string argument."
strval = unicodedata.normalize('NFKD',
unicode(strval.upper().strip())).encode('ASCII', 'ignore')
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if not strval:
return "Z000"
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strval = strval.encode('iso-8859-1')
str2 = strval[0]
strval = strval.translate(TABLE, IGNORE)
if not strval:
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return "Z000"
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prev = strval[0]
for character in strval[1:]:
if character != prev and character != "0":
str2 = str2 + character
prev = character
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# pad with zeros
str2 = str2+"0000"
return str2[:4]
#-------------------------------------------------------------------------
#
# compare - compares the soundex values of two strings
#
#-------------------------------------------------------------------------
def compare(str1, str2):
"1 if strings are close. 0 otherwise."
return soundex(str1) == soundex(str2)