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MFH: sync

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This commit is contained in:
Jani Taskinen 2007-11-06 13:38:15 +00:00
parent 7f0ad5c1e9
commit b51e9221b1
2 changed files with 69 additions and 79 deletions
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142
ext/standard/levenshtein.c
View File

@ -23,43 +23,51 @@
#include <ctype.h>
#include "php_string.h"
#define LEVENSHTEIN_MAX_LENTH 255
#define LEVENSHTEIN_MAX_LENGTH 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 )
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))
if (l1 == 0) {
return l2 * cost_ins;
}
if (l2 == 0) {
return l1 * cost_del;
}
if ((l1 > LEVENSHTEIN_MAX_LENGTH) || (l2 > LEVENSHTEIN_MAX_LENGTH)) {
return -1;
}
p1 = safe_emalloc((l2 + 1), sizeof(int), 0);
p2 = safe_emalloc((l2 + 1), sizeof(int), 0);
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++)
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;
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;
}
c0=p1[l2];
tmp = p1;
p1 = p2;
p2 = tmp;
}
c0 = p1[l2];
efree(p1);
efree(p2);
@ -70,7 +78,7 @@ static int reference_levdist(const char *s1, int l1,
/* {{{ custom_levdist
*/
static int custom_levdist(char *str1, char *str2, char *callback_name TSRMLS_DC)
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 */
@ -83,59 +91,43 @@ static int custom_levdist(char *str1, char *str2, char *callback_name TSRMLS_DC)
Calculate Levenshtein distance between two strings */
PHP_FUNCTION(levenshtein)
{
zval **str1, **str2, **cost_ins, **cost_rep, **cost_del, **callback_name;
int distance=-1;
int argc = ZEND_NUM_ARGS();
char *str1, *str2;
char *callback_name;
int str1_len, str2_len, callback_len;
long cost_ins, cost_rep, cost_del;
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) {
switch (argc) {
case 2: /* just two strings: use maximum performance version */
if (zend_parse_parameters(2 TSRMLS_CC, "ss", &str1, &str1_len, &str2, &str2_len) == FAILURE) {
return;
}
distance = reference_levdist(str1, str1_len, str2, str2_len, 1, 1, 1);
break;
case 5: /* more general version: calc cost by ins/rep/del weights */
if (zend_parse_parameters(5 TSRMLS_CC, "sslll", &str1, &str1_len, &str2, &str2_len, &cost_ins, &cost_rep, &cost_del) == FAILURE) {
return;
}
distance = reference_levdist(str1, str1_len, str2, str2_len, cost_ins, cost_rep, cost_del);
break;
case 3: /* most general version: calc cost by user-supplied function */
if (zend_parse_parameters(3 TSRMLS_CC, "sss", &str1, &str1_len, &str2, &str2_len, &callback_name, &callback_len) == FAILURE) {
return;
}
distance = custom_levdist(str1, str2, callback_name TSRMLS_CC);
break;
default:
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 && /* TODO */ ZEND_NUM_ARGS() != 3) {
if (distance < 0 && /* TODO */ ZEND_NUM_ARGS() != 3) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Argument string(s) too long");
}
RETURN_LONG(distance);
}
/* }}} */

6
ext/standard/tests/strings/levenshtein.phpt
View File

@ -77,10 +77,8 @@ Warning: levenshtein(): Argument string(s) too long in %s on line %d
Warning: levenshtein(): Argument string(s) too long in %s on line %d
all passed
Notice: Array to string conversion in %s on line %d
Notice: Array to string conversion in %s on line %d
int(0)
Warning: levenshtein() expects parameter 1 to be string, array given in %s on line %d
NULL
int(0)
int(0)