fuzzystrmatch -
Levenshtein and Metaphone fuzzy string matching
- by Joe Conway <joseph.conway@home.com>
+ by Joe Conway <joseph.conway@home.com>, Joel Burton <jburton@scw.org>
intarray -
Index support for arrays of int4, using GiST
metaphone -
Improved Soundex function
- by Joel Burton <jburton@scw.org>
miscutil -
PostgreSQL assert checking and various utility functions
Confidence-interval datatype (GiST indexing example)
by Gene Selkov, Jr. <selkovjr@mcs.anl.gov>
-soundex -
- Soundex function
-
spi -
Various trigger functions, examples for using SPI.
* Metaphone was originally created by Lawrence Philips and presented in article
* in "Computer Language" December 1990 issue.
*
+ * soundex()
+ * -----------
+ * Folded existing soundex contrib into this one. Renamed text_soundex() (C function)
+ * to soundex() for consistency.
+ *
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose, without fee, and without a written agreement
* is hereby granted, provided that the above copyright notice and this
*/
-Version 0.1 (3 August, 2001):
+Version 0.2 (7 August, 2001):
Functions to calculate the degree to which two strings match in a "fuzzy" way
Tested under Linux (Red Hat 6.2 and 7.0) and PostgreSQL 7.2devel
Release Notes:
+ Version 0.2
+ - folded soundex contrib into this one
+
Version 0.1
- initial release
--- /dev/null
+NOTE: Modified August 07, 2001 by Joe Conway. Updated for accuracy
+ after combining soundex code into the fuzzystrmatch contrib
+---------------------------------------------------------------------
+The Soundex system is a method of matching similar sounding names
+(or any words) to the same code. It was initially used by the
+United States Census in 1880, 1900, and 1910, but it has little use
+beyond English names (or the English pronunciation of names), and
+it is not a linguistic tool.
+
+The following are some usage examples:
+
+SELECT soundex('hello world!');
+
+CREATE TABLE s (nm text)\g
+
+insert into s values ('john')\g
+insert into s values ('joan')\g
+insert into s values ('wobbly')\g
+
+select * from s
+where soundex(nm) = soundex('john')\g
+
+select nm from s a, s b
+where soundex(a.nm) = soundex(b.nm)
+and a.oid <> b.oid\g
+
+CREATE FUNCTION text_sx_eq(text, text) RETURNS bool AS
+'select soundex($1) = soundex($2)'
+LANGUAGE 'sql'\g
+
+CREATE FUNCTION text_sx_lt(text,text) RETURNS bool AS
+'select soundex($1) < soundex($2)'
+LANGUAGE 'sql'\g
+
+CREATE FUNCTION text_sx_gt(text,text) RETURNS bool AS
+'select soundex($1) > soundex($2)'
+LANGUAGE 'sql';
+
+CREATE FUNCTION text_sx_le(text,text) RETURNS bool AS
+'select soundex($1) <= soundex($2)'
+LANGUAGE 'sql';
+
+CREATE FUNCTION text_sx_ge(text,text) RETURNS bool AS
+'select soundex($1) >= soundex($2)'
+LANGUAGE 'sql';
+
+CREATE FUNCTION text_sx_ne(text,text) RETURNS bool AS
+'select soundex($1) <> soundex($2)'
+LANGUAGE 'sql';
+
+DROP OPERATOR #= (text,text)\g
+
+CREATE OPERATOR #= (leftarg=text, rightarg=text, procedure=text_sx_eq,
+commutator=text_sx_eq)\g
+
+SELECT *
+FROM s
+WHERE text_sx_eq(nm,'john')\g
+
+SELECT *
+from s
+where s.nm #= 'john';
return(META_SUCCESS);
} /* END metaphone */
+
+
+/*
+ * SQL function: soundex(text) returns text
+ */
+PG_FUNCTION_INFO_V1(soundex);
+
+Datum
+soundex(PG_FUNCTION_ARGS)
+{
+ char outstr[SOUNDEX_LEN + 1];
+ char *arg;
+
+ arg = _textout(PG_GETARG_TEXT_P(0));
+
+ _soundex(arg, outstr);
+
+ PG_RETURN_TEXT_P(_textin(outstr));
+}
+
+static void
+_soundex(const char *instr, char *outstr)
+{
+ int count;
+
+ AssertArg(instr);
+ AssertArg(outstr);
+
+ outstr[SOUNDEX_LEN] = '\0';
+
+ /* Skip leading non-alphabetic characters */
+ while (!isalpha((unsigned char) instr[0]) && instr[0])
+ ++instr;
+
+ /* No string left */
+ if (!instr[0])
+ {
+ outstr[0] = (char) 0;
+ return;
+ }
+
+ /* Take the first letter as is */
+ *outstr++ = (char) toupper((unsigned char) *instr++);
+
+ count = 1;
+ while (*instr && count < SOUNDEX_LEN)
+ {
+ if (isalpha((unsigned char) *instr) &&
+ soundex_code(*instr) != soundex_code(*(instr - 1)))
+ {
+ *outstr = soundex_code(instr[0]);
+ if (*outstr != '0')
+ {
+ ++outstr;
+ ++count;
+ }
+ }
+ ++instr;
+ }
+
+ /* Fill with 0's */
+ while (count < SOUNDEX_LEN)
+ {
+ *outstr = '0';
+ ++outstr;
+ ++count;
+ }
+}
#include "utils/builtins.h"
-#define MAX_LEVENSHTEIN_STRLEN 255
-#define MAX_METAPHONE_STRLEN 255
-
-typedef struct dynmatrix
-{
- int value;
-} dynmat;
-
/*
* External declarations
*/
extern Datum levenshtein(PG_FUNCTION_ARGS);
extern Datum metaphone(PG_FUNCTION_ARGS);
+extern Datum soundex(PG_FUNCTION_ARGS);
/*
- * Internal declarations
+ * Soundex
*/
+static void _soundex(const char *instr, char *outstr);
+#define SOUNDEX_LEN 4
+#define _textin(str) DirectFunctionCall1(textin, CStringGetDatum(str))
+#define _textout(str) DatumGetPointer(DirectFunctionCall1(textout, PointerGetDatum(str)))
+/* ABCDEFGHIJKLMNOPQRSTUVWXYZ */
+static const char *soundex_table = "01230120022455012623010202";
+#define soundex_code(letter) soundex_table[toupper((unsigned char) (letter)) - 'A']
+
+
+/*
+ * Levenshtein
+ */
#define STRLEN(p) strlen(p)
#define CHAREQ(p1, p2) (*(p1) == *(p2))
#define NextChar(p) ((p)++)
+#define MAX_LEVENSHTEIN_STRLEN 255
+
+/*
+ * Metaphone
+ */
+#define MAX_METAPHONE_STRLEN 255
/*
* Original code by Michael G Schwern starts here.
CREATE FUNCTION metaphone (text,int) RETURNS text
AS 'MODULE_PATHNAME','metaphone' LANGUAGE 'c' with (iscachable, isstrict);
+
+CREATE FUNCTION soundex(text) RETURNS text
+ AS 'MODULE_PATHNAME', 'soundex' LANGUAGE 'c' with (iscachable, isstrict);
+
+CREATE FUNCTION text_soundex(text) RETURNS text
+ AS 'MODULE_PATHNAME', 'soundex' LANGUAGE 'c';
+++ /dev/null
-#
-# $Header: /cvsroot/pgsql/contrib/metaphone/Attic/Makefile,v 1.2 2001/06/20 00:04:44 momjian Exp $
-#
-
-subdir = contrib/metaphone
-top_builddir = ../..
-include $(top_builddir)/src/Makefile.global
-
-NAME := metaphone
-SONAME := $(NAME)$(DLSUFFIX)
-
-override CPPFLAGS += -I$(srcdir)
-override CFLAGS += $(CFLAGS_SL)
-override DLLLIBS := $(BE_DLLLIBS) $(DLLLIBS)
-
-all: $(SONAME) $(NAME).sql
-
-$(NAME).sql: $(NAME).sql.in
- sed 's,@MODULE_FILENAME@,$(libdir)/contrib/$(SONAME),g' $< >$@
-
-install: all installdirs
- $(INSTALL_SHLIB) $(SONAME) $(libdir)/contrib
- $(INSTALL_DATA) $(NAME).sql $(datadir)/contrib
- $(INSTALL_DATA) README.$(NAME) $(docdir)/contrib
-
-installdirs:
- $(mkinstalldirs) $(libdir)/contrib $(datadir)/contrib $(docdir)/contrib
-
-uninstall:
- rm -f $(libdir)/contrib/$(SONAME) $(datadir)/contrib/$(NAME).sql $(docdir)/contrib/README.$(NAME)
-
-clean distclean maintainer-clean:
- rm -f $(SONAME) $(NAME).o $(NAME).sql
-
-depend dep:
- $(CC) -MM -MG $(CFLAGS) *.c > depend
-
-ifeq (depend,$(wildcard depend))
-include depend
-endif
+++ /dev/null
-This directory contains a module that implements the "Metaphone" code as
-a PostgreSQL user-defined function. The Metaphone system is a method of
-matching similar sounding names (or any words) to the same code.
-
-Metaphone was invented by Lawrence Philips as an improvement to the popular
-name-hashing routine, Soundex.
-
-This metaphone code is from Michael Kuhn, and is detailed at
- http://aspell.sourceforge.net/metaphone/metaphone-kuhn.txt
-
-Code for this (including this help file!) was liberally borrowed from
-the soundex() module for PostgreSQL.
-
-There are two functions:
- metaphone(text) : returns hash of a name
- metaphone(text,int) : returns hash (maximum length of int) of name
-
----
-
-To install it, first configure the main source tree, then run make;
-make install in this directory. Finally, load the function definition
-with psql:
-
- psql -f PREFIX/share/contrib/metaphone.sql
-
-The following are some usage examples:
-
-SELECT text_metaphone('hello world!');
-SELECT text_metaphone('hello world!', 4);
-
-CREATE TABLE s (nm text)\g
-
-insert into s values ('john')\g
-insert into s values ('joan')\g
-insert into s values ('wobbly')\g
-
-select * from s
-where text_metaphone(nm) = text_metaphone('john')\g
-
-select nm from s a, s b
-where text_metaphone(a.nm) = text_metaphone(b.nm)
-and a.oid <> b.oid\g
-
-CREATE FUNCTION text_mp_eq(text, text) RETURNS bool AS
-'select text_metaphone($1) = text_metaphone($2)'
-LANGUAGE 'sql'\g
-
-CREATE FUNCTION text_mp_lt(text,text) RETURNS bool AS
-'select text_metaphone($1) < text_metaphone($2)'
-LANGUAGE 'sql'\g
-
-CREATE FUNCTION text_mp_gt(text,text) RETURNS bool AS
-'select text_metaphone($1) > text_metaphone($2)'
-LANGUAGE 'sql';
-
-CREATE FUNCTION text_mp_le(text,text) RETURNS bool AS
-'select text_metaphone($1) <= text_metaphone($2)'
-LANGUAGE 'sql';
-
-CREATE FUNCTION text_mp_ge(text,text) RETURNS bool AS
-'select text_metaphone($1) >= text_metaphone($2)'
-LANGUAGE 'sql';
-
-CREATE FUNCTION text_mp_ne(text,text) RETURNS bool AS
-'select text_metaphone($1) <> text_metaphone($2)'
-LANGUAGE 'sql';
-
-DROP OPERATOR #= (text,text)\g
-
-CREATE OPERATOR #= (leftarg=text, rightarg=text, procedure=text_mp_eq,
-commutator=text_mp_eq)\g
-
-SELECT *
-FROM s
-WHERE text_mp_eq(nm,'pillsbury')\g
-
-SELECT *
-from s
-where s.nm #= 'pillsbury';
+++ /dev/null
-
-#include "postgres.h"
-#include "fmgr.h"
-#include "utils/builtins.h"
-
-#include <stdio.h>
-#include <string.h>
-#include <ctype.h>
-
-Datum text_metaphone(PG_FUNCTION_ARGS);
-Datum text_metaphone_length(PG_FUNCTION_ARGS);
-
-void phonetic(char *name, char *metaph, int metalen);
-
-#define METAPHONE_LEN 50
-#undef METAPHONE_TEST
-
-#define _textin(str) DirectFunctionCall1(textin, CStringGetDatum(str))
-#define _textout(str) DatumGetPointer(DirectFunctionCall1(textout, PointerGetDatum(str)))
-
-#define NULLCHAR (char *) 0
-
-char *VOWELS="AEIOU",
- *FRONTV="EIY", /* special cases for letters in FRONT of these */
- *VARSON="CSPTG", /* variable sound--those modified by adding an "h" */
- *DOUBLE="."; /* let these double letters through */
-
-char *excpPAIR="AGKPW", /* exceptions "ae-", "gn-", "kn-", "pn-", "wr-" */
- *nextLTR ="ENNNR";
-char *chrptr, *chrptr1;
-
-void phonetic(name,metaph,metalen)
-char *name, *metaph;
-int metalen;
-{
-
-int ii, jj, silent, hard, Lng, lastChr;
-
-char curLtr, prevLtr, nextLtr, nextLtr2, nextLtr3;
-
-int vowelAfter, vowelBefore, frontvAfter;
-
-char wname[60];
-char *ename=wname;
-
- jj = 0;
- for (ii=0; name[ii] != '\0'; ii++) {
- if ( isalpha(name[ii]) ) {
- ename[jj] = toupper(name[ii]);
- jj++;
- }
- }
- ename[jj] = '\0';
-
- if (strlen(ename) == 0) return;
-
- /* if ae, gn, kn, pn, wr then drop the first letter */
- if ( (chrptr=strchr(excpPAIR,ename[0]) ) != NULLCHAR ) {
- chrptr1 = nextLTR + (chrptr-excpPAIR);
- if ( *chrptr1 == ename[1] ) strcpy(ename,&ename[1]);
- }
- /* change x to s */
- if (ename[0] == 'X') ename[0] = 'S';
- /* get rid of the "h" in "wh" */
- if ( strncmp(ename,"WH",2) == 0 ) strcpy(&ename[1], &ename[2]);
-
- Lng = strlen(ename);
- lastChr = Lng -1; /* index to last character in string makes code easier*/
-
- /* Remove an S from the end of the string */
- if ( ename[lastChr] == 'S' ) {
- ename[lastChr] = '\0';
- Lng = strlen(ename);
- lastChr = Lng -1;
- }
-
- for (ii=0; ( (strlen(metaph) < metalen) && (ii < Lng) ); ii++) {
-
- curLtr = ename[ii];
-
- vowelBefore = FALSE; prevLtr = ' ';
- if (ii > 0) {
- prevLtr = ename[ii-1];
- if ( strchr(VOWELS,prevLtr) != NULLCHAR ) vowelBefore = TRUE;
- }
- /* if first letter is a vowel KEEP it */
- if (ii == 0 && (strchr(VOWELS,curLtr) != NULLCHAR) ) {
- strncat(metaph,&curLtr,1);
- continue;
- }
-
- vowelAfter = FALSE; frontvAfter = FALSE; nextLtr = ' ';
- if ( ii < lastChr ) {
- nextLtr = ename[ii+1];
- if ( strchr(VOWELS,nextLtr) != NULLCHAR ) vowelAfter = TRUE;
- if ( strchr(FRONTV,nextLtr) != NULLCHAR ) frontvAfter = TRUE;
- }
- /* skip double letters except ones in list */
- if (curLtr == nextLtr && (strchr(DOUBLE,nextLtr) == NULLCHAR) ) continue;
-
- nextLtr2 = ' ';
- if (ii < (lastChr-1) ) nextLtr2 = ename[ii+2];
-
- nextLtr3 = ' ';
- if (ii < (lastChr-2) ) nextLtr3 = ename[ii+3];
-
- switch (curLtr) {
-
- case 'B': silent = FALSE;
- if (ii == lastChr && prevLtr == 'M') silent = TRUE;
- if (! silent) strncat(metaph,&curLtr,1);
- break;
-
- /*silent -sci-,-sce-,-scy-; sci-, etc OK*/
- case 'C': if (! (ii > 1 && prevLtr == 'S' && frontvAfter) ) {
-
- if ( ii > 0 && nextLtr == 'I' && nextLtr2 == 'A' )
- strncat(metaph,"X",1);
- else
- if (frontvAfter)
- strncat(metaph,"S",1);
- else
- if (ii > 1 && prevLtr == 'S' && nextLtr == 'H')
- strncat(metaph,"K",1);
- else
- if (nextLtr == 'H')
- if (ii == 0 && (strchr(VOWELS,nextLtr2) == NULLCHAR) )
- strncat(metaph,"K",1);
- else
- strncat(metaph,"X",1);
- else
- if (prevLtr == 'C')
- strncat(metaph,"C",1);
- else
- strncat(metaph,"K",1);
- }
- break;
-
- case 'D': if (nextLtr == 'G' && (strchr(FRONTV,nextLtr2) != NULLCHAR))
- strncat(metaph,"J",1);
- else
- strncat(metaph,"T",1);
- break;
-
- case 'G': silent=FALSE;
- /* SILENT -gh- except for -gh and no vowel after h */
- if ( (ii < (lastChr-1) && nextLtr == 'H')
- && (strchr(VOWELS,nextLtr2) == NULLCHAR) )
- silent=TRUE;
-
- if ( (ii == (lastChr-3) )
- && nextLtr == 'N' && nextLtr2 == 'E' && nextLtr3 == 'D')
- silent=TRUE;
- else
- if ( (ii == (lastChr-1)) && nextLtr == 'N') silent=TRUE;
-
- if (prevLtr == 'D' && frontvAfter) silent=TRUE;
-
- if (prevLtr == 'G')
- hard=TRUE;
- else
- hard=FALSE;
-
- if (!silent) {
- if (frontvAfter && (! hard) )
- strncat(metaph,"J",1);
- else
- strncat(metaph,"K",1);
- }
- break;
-
- case 'H': silent = FALSE;
- if ( strchr(VARSON,prevLtr) != NULLCHAR ) silent = TRUE;
-
- if ( vowelBefore && !vowelAfter) silent = TRUE;
-
- if (!silent) strncat(metaph,&curLtr,1);
- break;
-
- case 'F':
- case 'J':
- case 'L':
- case 'M':
- case 'N':
- case 'R': strncat(metaph,&curLtr,1);
- break;
-
- case 'K': if (prevLtr != 'C') strncat(metaph,&curLtr,1);
- break;
-
- case 'P': if (nextLtr == 'H')
- strncat(metaph,"F",1);
- else
- strncat(metaph,"P",1);
- break;
-
- case 'Q': strncat(metaph,"K",1);
- break;
-
- case 'S': if (ii > 1 && nextLtr == 'I'
- && ( nextLtr2 == 'O' || nextLtr2 == 'A') )
- strncat(metaph,"X",1);
- else
- if (nextLtr == 'H')
- strncat(metaph,"X",1);
- else
- strncat(metaph,"S",1);
- break;
-
- case 'T': if (ii > 1 && nextLtr == 'I'
- && ( nextLtr2 == 'O' || nextLtr2 == 'A') )
- strncat(metaph,"X",1);
- else
- if (nextLtr == 'H') /* The=0, Tho=T, Withrow=0 */
- if (ii > 0 || (strchr(VOWELS,nextLtr2) != NULLCHAR) )
- strncat(metaph,"0",1);
- else
- strncat(metaph,"T",1);
- else
- if (! (ii < (lastChr-2) && nextLtr == 'C' && nextLtr2 == 'H'))
- strncat(metaph,"T",1);
- break;
-
- case 'V': strncat(metaph,"F",1);
- break;
-
- case 'W':
- case 'Y': if (ii < lastChr && vowelAfter) strncat(metaph,&curLtr,1);
- break;
-
- case 'X': strncat(metaph,"KS",2);
- break;
-
- case 'Z': strncat(metaph,"S",1);
- break;
- }
-
- }
-
-/* DON'T DO THIS NOW, REMOVING "S" IN BEGINNING HAS the same effect
- with plurals, in addition imbedded S's in the Metaphone are included
- Lng = strlen(metaph);
- lastChr = Lng -1;
- if ( metaph[lastChr] == 'S' && Lng >= 3 ) metaph[lastChr] = '\0';
-*/
-
- return;
-}
-
-
-#ifdef METAPHONE_TEST
-int
-main(int argc, char *argv[])
-{
- if (argc < 2)
- {
- fprintf(stderr, "usage: %s string\n", argv[0]);
- return 1;
- }
- else
- {
- char output[51]="";
-
- phonetic(argv[1], output, 50);
- printf("metaphone(%s) = %s\n", argv[1], output);
- return 0;
- }
-}
-
-#endif /* METAPHONE_TEST */
-
-#ifndef METAPHONE_TEST
-/*
- * SQL function: text_metaphone(text) returns text
- */
-PG_FUNCTION_INFO_V1(text_metaphone);
-
-Datum
-text_metaphone(PG_FUNCTION_ARGS)
-{
- char outstr[51]="";
- char *arg;
-
- arg = _textout(PG_GETARG_TEXT_P(0));
-
- phonetic(arg, outstr, 50);
-
- PG_RETURN_TEXT_P(_textin(outstr));
-}
-
-/*
- char outstr[51]="";
- char *arg;
- int32 metalen;
-
- arg = _textout(PG_GETARG_TEXT_P(0));
- metalen = PG_GETARG_INT32(1);
-
-
- phonetic(arg, outstr, metalen);
-*/
-
-PG_FUNCTION_INFO_V1(text_metaphone_length);
-
-Datum
-text_metaphone_length(PG_FUNCTION_ARGS)
-{
- char outstr[51]="";
- char *arg;
- int32 metalen;
-
- arg = _textout(PG_GETARG_TEXT_P(0));
- metalen = PG_GETARG_INT32(1);
-
- phonetic(arg, outstr, metalen);
-
- PG_RETURN_TEXT_P(_textin(outstr));
-}
-
-
-#endif /* not METAPHONE_TEST */
+++ /dev/null
-CREATE FUNCTION text_soundex(text) RETURNS text
- AS '@MODULE_FILENAME@', 'text_metaphone' LANGUAGE 'C';
-
+++ /dev/null
-#
-# $Header: /cvsroot/pgsql/contrib/soundex/Attic/Makefile,v 1.10 2001/06/18 21:38:02 momjian Exp $
-#
-
-subdir = contrib/soundex
-top_builddir = ../..
-include $(top_builddir)/src/Makefile.global
-
-NAME := soundex
-SONAME := $(NAME)$(DLSUFFIX)
-
-override CPPFLAGS += -I$(srcdir)
-override CFLAGS += $(CFLAGS_SL)
-override DLLLIBS := $(BE_DLLLIBS) $(DLLLIBS)
-
-all: $(SONAME) $(NAME).sql
-
-$(NAME).sql: $(NAME).sql.in
- sed 's,@MODULE_FILENAME@,$(libdir)/contrib/$(SONAME),g' $< >$@
-
-install: all installdirs
- $(INSTALL_SHLIB) $(SONAME) $(libdir)/contrib
- $(INSTALL_DATA) $(NAME).sql $(datadir)/contrib
- $(INSTALL_DATA) README.$(NAME) $(docdir)/contrib
-
-installdirs:
- $(mkinstalldirs) $(libdir)/contrib $(datadir)/contrib $(docdir)/contrib
-
-uninstall:
- rm -f $(libdir)/contrib/$(SONAME) $(datadir)/contrib/$(NAME).sql $(docdir)/contrib/README.$(NAME)
-
-clean distclean maintainer-clean:
- rm -f $(SONAME) $(NAME).o $(NAME).sql
-
-depend dep:
- $(CC) -MM -MG $(CFLAGS) *.c > depend
-
-ifeq (depend,$(wildcard depend))
-include depend
-endif
+++ /dev/null
-This directory contains a module that implements the "Soundex" code as
-a PostgreSQL user-defined function. The Soundex system is a method of
-matching similar sounding names (or any words) to the same code. It
-was initially used by the United States Census in 1880, 1900, and
-1910, but it has little use beyond English names (or the English
-pronunciation of names), and it is not a linguistic tool.
-
-To install it, first configure the main source tree, then run make;
-make install in this directory. Finally, load the function definition
-with psql:
-
- psql -f PREFIX/share/contrib/soundex.sql
-
-The following are some usage examples:
-
-SELECT text_soundex('hello world!');
-
-CREATE TABLE s (nm text)\g
-
-insert into s values ('john')\g
-insert into s values ('joan')\g
-insert into s values ('wobbly')\g
-
-select * from s
-where text_soundex(nm) = text_soundex('john')\g
-
-select nm from s a, s b
-where text_soundex(a.nm) = text_soundex(b.nm)
-and a.oid <> b.oid\g
-
-CREATE FUNCTION text_sx_eq(text, text) RETURNS bool AS
-'select text_soundex($1) = text_soundex($2)'
-LANGUAGE 'sql'\g
-
-CREATE FUNCTION text_sx_lt(text,text) RETURNS bool AS
-'select text_soundex($1) < text_soundex($2)'
-LANGUAGE 'sql'\g
-
-CREATE FUNCTION text_sx_gt(text,text) RETURNS bool AS
-'select text_soundex($1) > text_soundex($2)'
-LANGUAGE 'sql';
-
-CREATE FUNCTION text_sx_le(text,text) RETURNS bool AS
-'select text_soundex($1) <= text_soundex($2)'
-LANGUAGE 'sql';
-
-CREATE FUNCTION text_sx_ge(text,text) RETURNS bool AS
-'select text_soundex($1) >= text_soundex($2)'
-LANGUAGE 'sql';
-
-CREATE FUNCTION text_sx_ne(text,text) RETURNS bool AS
-'select text_soundex($1) <> text_soundex($2)'
-LANGUAGE 'sql';
-
-DROP OPERATOR #= (text,text)\g
-
-CREATE OPERATOR #= (leftarg=text, rightarg=text, procedure=text_sx_eq,
-commutator=text_sx_eq)\g
-
-SELECT *
-FROM s
-WHERE text_sx_eq(nm,'john')\g
-
-SELECT *
-from s
-where s.nm #= 'john';
+++ /dev/null
-/* $Header: /cvsroot/pgsql/contrib/soundex/Attic/soundex.c,v 1.11 2001/03/22 03:59:10 momjian Exp $ */
-#include "postgres.h"
-
-#include <ctype.h>
-
-#include "fmgr.h"
-#include "utils/builtins.h"
-
-
-Datum text_soundex(PG_FUNCTION_ARGS);
-
-static void soundex(const char *instr, char *outstr);
-
-#define SOUNDEX_LEN 4
-
-
-#define _textin(str) DirectFunctionCall1(textin, CStringGetDatum(str))
-#define _textout(str) DatumGetPointer(DirectFunctionCall1(textout, PointerGetDatum(str)))
-
-
-#ifndef SOUNDEX_TEST
-/*
- * SQL function: text_soundex(text) returns text
- */
-PG_FUNCTION_INFO_V1(text_soundex);
-
-Datum
-text_soundex(PG_FUNCTION_ARGS)
-{
- char outstr[SOUNDEX_LEN + 1];
- char *arg;
-
- arg = _textout(PG_GETARG_TEXT_P(0));
-
- soundex(arg, outstr);
-
- PG_RETURN_TEXT_P(_textin(outstr));
-}
-
-#endif /* not SOUNDEX_TEST */
-
-
-/* ABCDEFGHIJKLMNOPQRSTUVWXYZ */
-static const char *soundex_table = "01230120022455012623010202";
-
-#define soundex_code(letter) soundex_table[toupper((unsigned char) (letter)) - 'A']
-
-
-static void
-soundex(const char *instr, char *outstr)
-{
- int count;
-
- AssertArg(instr);
- AssertArg(outstr);
-
- outstr[SOUNDEX_LEN] = '\0';
-
- /* Skip leading non-alphabetic characters */
- while (!isalpha((unsigned char) instr[0]) && instr[0])
- ++instr;
-
- /* No string left */
- if (!instr[0])
- {
- outstr[0] = (char) 0;
- return;
- }
-
- /* Take the first letter as is */
- *outstr++ = (char) toupper((unsigned char) *instr++);
-
- count = 1;
- while (*instr && count < SOUNDEX_LEN)
- {
- if (isalpha((unsigned char) *instr) &&
- soundex_code(*instr) != soundex_code(*(instr - 1)))
- {
- *outstr = soundex_code(instr[0]);
- if (*outstr != '0')
- {
- ++outstr;
- ++count;
- }
- }
- ++instr;
- }
-
- /* Fill with 0's */
- while (count < SOUNDEX_LEN)
- {
- *outstr = '0';
- ++outstr;
- ++count;
- }
-}
-
-
-
-#ifdef SOUNDEX_TEST
-int
-main(int argc, char *argv[])
-{
- if (argc < 2)
- {
- fprintf(stderr, "usage: %s string\n", argv[0]);
- return 1;
- }
- else
- {
- char output[SOUNDEX_LEN + 1];
-
- soundex(argv[1], output);
- printf("soundex(%s) = %s\n", argv[1], output);
- return 0;
- }
-}
-
-#endif /* SOUNDEX_TEST */
+++ /dev/null
-CREATE FUNCTION text_soundex(text) RETURNS text
- AS '@MODULE_FILENAME@', 'text_soundex' LANGUAGE 'C';
-
-CREATE FUNCTION soundex(text) RETURNS text
- AS '@MODULE_FILENAME@', 'text_soundex' LANGUAGE 'C';
projects / postgresql / commitdiff