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Diffstat (limited to 'ext/standard/levenshtein.c')
| -rw-r--r-- | ext/standard/levenshtein.c | 150 |
1 files changed, 0 insertions, 150 deletions
diff --git a/ext/standard/levenshtein.c b/ext/standard/levenshtein.c deleted file mode 100644 index fb1db6a967..0000000000 --- a/ext/standard/levenshtein.c +++ /dev/null @@ -1,150 +0,0 @@ -/* - +----------------------------------------------------------------------+ - | PHP Version 5 | - +----------------------------------------------------------------------+ - | Copyright (c) 1997-2005 The PHP Group | - +----------------------------------------------------------------------+ - | This source file is subject to version 3.0 of the PHP license, | - | that is bundled with this package in the file LICENSE, and is | - | available through the world-wide-web at the following url: | - | http://www.php.net/license/3_0.txt. | - | If you did not receive a copy of the PHP license and are unable to | - | obtain it through the world-wide-web, please send a note to | - | license@php.net so we can mail you a copy immediately. | - +----------------------------------------------------------------------+ - | Author: Hartmut Holzgraefe <hholzgra@php.net> | - +----------------------------------------------------------------------+ - */ -/* $Id$ */ - -#include "php.h" -#include <stdlib.h> -#include <errno.h> -#include <ctype.h> -#include "php_string.h" - -#define LEVENSHTEIN_MAX_LENTH 255 - -/* {{{ reference_levdist - * reference implementation, only optimized for memory usage, not speed */ -static int reference_levdist(const char *s1, int l1, - const char *s2, int l2, - int cost_ins, int cost_rep, int cost_del ) -{ - int *p1, *p2, *tmp; - int i1, i2, c0, c1, c2; - - if(l1==0) return l2*cost_ins; - if(l2==0) return l1*cost_del; - - if((l1>LEVENSHTEIN_MAX_LENTH)||(l2>LEVENSHTEIN_MAX_LENTH)) - return -1; - - p1 = safe_emalloc((l2+1), sizeof(int), 0); - p2 = safe_emalloc((l2+1), sizeof(int), 0); - - for(i2=0;i2<=l2;i2++) - p1[i2] = i2*cost_ins; - - for(i1=0;i1<l1;i1++) - { - p2[0]=p1[0]+cost_del; - for(i2=0;i2<l2;i2++) - { - c0=p1[i2]+((s1[i1]==s2[i2])?0:cost_rep); - c1=p1[i2+1]+cost_del; if(c1<c0) c0=c1; - c2=p2[i2]+cost_ins; if(c2<c0) c0=c2; - p2[i2+1]=c0; - } - tmp=p1; p1=p2; p2=tmp; - } - - c0=p1[l2]; - - efree(p1); - efree(p2); - - return c0; -} -/* }}} */ - -/* {{{ custom_levdist - */ -static int custom_levdist(char *str1, char *str2, char *callback_name TSRMLS_DC) -{ - php_error_docref(NULL TSRMLS_CC, E_WARNING, "The general Levenshtein support is not there yet"); - /* not there yet */ - - return -1; -} -/* }}} */ - -/* {{{ proto int levenshtein(string str1, string str2) - Calculate Levenshtein distance between two strings */ -PHP_FUNCTION(levenshtein) -{ - zval **str1, **str2, **cost_ins, **cost_rep, **cost_del, **callback_name; - int distance=-1; - - switch(ZEND_NUM_ARGS()) { - case 2: /* just two string: use maximum performance version */ - if (zend_get_parameters_ex(2, &str1, &str2) == FAILURE) { - WRONG_PARAM_COUNT; - } - convert_to_string_ex(str1); - convert_to_string_ex(str2); - - distance = reference_levdist(Z_STRVAL_PP(str1), Z_STRLEN_PP(str1), - Z_STRVAL_PP(str2), Z_STRLEN_PP(str2), 1, 1, 1); - - break; - - case 5: /* more general version: calc cost by ins/rep/del weights */ - if (zend_get_parameters_ex(5, &str1, &str2, &cost_ins, &cost_rep, &cost_del) == FAILURE) { - WRONG_PARAM_COUNT; - } - convert_to_string_ex(str1); - convert_to_string_ex(str2); - convert_to_long_ex(cost_ins); - convert_to_long_ex(cost_rep); - convert_to_long_ex(cost_del); - - distance = reference_levdist(Z_STRVAL_PP(str1), Z_STRLEN_PP(str1), - Z_STRVAL_PP(str2), Z_STRLEN_PP(str2), - Z_LVAL_PP(cost_ins), Z_LVAL_PP(cost_rep), - Z_LVAL_PP(cost_del)); - - break; - - case 3: /* most general version: calc cost by user-supplied function */ - if (zend_get_parameters_ex(3, &str1, &str2, &callback_name) == FAILURE) { - WRONG_PARAM_COUNT; - } - convert_to_string_ex(str1); - convert_to_string_ex(str2); - convert_to_string_ex(callback_name); - - distance = custom_levdist(Z_STRVAL_PP(str1), Z_STRVAL_PP(str2), - Z_STRVAL_PP(callback_name) TSRMLS_CC); - break; - - default: - WRONG_PARAM_COUNT; - } - - if(distance<0) { - php_error_docref(NULL TSRMLS_CC, E_WARNING, "Argument string(s) too long"); - } - - RETURN_LONG(distance); -} -/* }}} */ - -/* - * Local variables: - * tab-width: 4 - * c-basic-offset: 4 - * End: - * vim600: sw=4 ts=4 fdm=marker - * vim<600: sw=4 ts=4 - */ |