mirror of https://github.com/postgres/postgres
specify the cost values to use, instead of always using 1's. Volkan Yazici In passing, remove fuzzystrmatch.h, which contained a bunch of stuff that had no business being in a .h file; fold it into its only user, fuzzystrmatch.c.REL8_5_ALPHA1_BRANCH
Tom Lane
17 years ago
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/*
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* fuzzystrmatch.h |
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* |
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* Functions for "fuzzy" comparison of strings |
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* |
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* Joe Conway <mail@joeconway.com> |
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* |
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* $PostgreSQL: pgsql/contrib/fuzzystrmatch/fuzzystrmatch.h,v 1.17 2008/03/25 22:42:41 tgl Exp $ |
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* Copyright (c) 2001-2008, PostgreSQL Global Development Group |
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* ALL RIGHTS RESERVED; |
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* |
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* levenshtein() |
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* ------------- |
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* Written based on a description of the algorithm by Michael Gilleland |
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* found at http://www.merriampark.com/ld.htm
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* Also looked at levenshtein.c in the PHP 4.0.6 distribution for |
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* inspiration. |
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* |
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* metaphone() |
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* ----------- |
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* Modified for PostgreSQL by Joe Conway. |
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* Based on CPAN's "Text-Metaphone-1.96" by Michael G Schwern <schwern@pobox.com> |
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* Code slightly modified for use as PostgreSQL function (palloc, elog, etc). |
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* Metaphone was originally created by Lawrence Philips and presented in article |
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* in "Computer Language" December 1990 issue. |
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* |
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* Permission to use, copy, modify, and distribute this software and its |
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* documentation for any purpose, without fee, and without a written agreement |
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* is hereby granted, provided that the above copyright notice and this |
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* paragraph and the following two paragraphs appear in all copies. |
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* |
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* IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY PARTY FOR |
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING |
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* LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS |
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* DOCUMENTATION, EVEN IF THE AUTHOR OR DISTRIBUTORS HAVE BEEN ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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* THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES, |
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY |
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* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
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* ON AN "AS IS" BASIS, AND THE AUTHOR AND DISTRIBUTORS HAS NO OBLIGATIONS TO |
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
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* |
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*/ |
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#ifndef FUZZYSTRMATCH_H |
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#define FUZZYSTRMATCH_H |
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#include "postgres.h" |
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#include <ctype.h> |
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#include "fmgr.h" |
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#include "utils/builtins.h" |
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/*
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* External declarations |
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*/ |
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extern Datum levenshtein(PG_FUNCTION_ARGS); |
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extern Datum metaphone(PG_FUNCTION_ARGS); |
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extern Datum soundex(PG_FUNCTION_ARGS); |
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extern Datum difference(PG_FUNCTION_ARGS); |
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/*
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* Soundex |
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*/ |
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static void _soundex(const char *instr, char *outstr); |
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#define SOUNDEX_LEN 4 |
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/* ABCDEFGHIJKLMNOPQRSTUVWXYZ */ |
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static const char *soundex_table = "01230120022455012623010202"; |
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#define soundex_code(letter) soundex_table[toupper((unsigned char) (letter)) - 'A'] |
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/*
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* Levenshtein |
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*/ |
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#define MAX_LEVENSHTEIN_STRLEN 255 |
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/*
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* Metaphone |
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*/ |
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#define MAX_METAPHONE_STRLEN 255 |
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/*
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* Original code by Michael G Schwern starts here. |
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* Code slightly modified for use as PostgreSQL |
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* function (combined *.h into here). |
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*------------------------------------------------------------------*/ |
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/**************************************************************************
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metaphone -- Breaks english phrases down into their phonemes. |
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Input |
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word -- An english word to be phonized |
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max_phonemes -- How many phonemes to calculate. If 0, then it |
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will phonize the entire phrase. |
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phoned_word -- The final phonized word. (We'll allocate the |
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memory.) |
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Output |
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error -- A simple error flag, returns TRUE or FALSE |
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NOTES: ALL non-alpha characters are ignored, this includes whitespace, |
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although non-alpha characters will break up phonemes. |
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****************************************************************************/ |
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/**************************************************************************
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my constants -- constants I like |
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Probably redundant. |
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***************************************************************************/ |
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#define META_ERROR FALSE |
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#define META_SUCCESS TRUE |
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#define META_FAILURE FALSE |
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/* I add modifications to the traditional metaphone algorithm that you
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might find in books. Define this if you want metaphone to behave |
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traditionally */ |
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#undef USE_TRADITIONAL_METAPHONE |
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/* Special encodings */ |
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#define SH 'X' |
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#define TH '0' |
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char Lookahead(char *word, int how_far); |
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int |
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_metaphone( |
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/* IN */ |
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char *word, |
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int max_phonemes, |
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/* OUT */ |
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char **phoned_word |
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); |
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/* Metachar.h ... little bits about characters for metaphone */ |
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/*-- Character encoding array & accessing macros --*/ |
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/* Stolen directly out of the book... */ |
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char _codes[26] = { |
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1, 16, 4, 16, 9, 2, 4, 16, 9, 2, 0, 2, 2, 2, 1, 4, 0, 2, 4, 4, 1, 0, 0, 0, 8, 0 |
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/* a b c d e f g h i j k l m n o p q r s t u v w x y z */ |
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}; |
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#define ENCODE(c) (isalpha((unsigned char) (c)) ? _codes[((toupper((unsigned char) (c))) - 'A')] : 0) |
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#define isvowel(c) (ENCODE(c) & 1) /* AEIOU */ |
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/* These letters are passed through unchanged */ |
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#define NOCHANGE(c) (ENCODE(c) & 2) /* FJMNR */ |
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/* These form dipthongs when preceding H */ |
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#define AFFECTH(c) (ENCODE(c) & 4) /* CGPST */ |
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/* These make C and G soft */ |
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#define MAKESOFT(c) (ENCODE(c) & 8) /* EIY */ |
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/* These prevent GH from becoming F */ |
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#define NOGHTOF(c) (ENCODE(c) & 16) /* BDH */ |
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#endif /* FUZZYSTRMATCH_H */ |
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