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