mirror of
https://github.com/php/php-src.git
synced 2024-12-15 12:54:57 +08:00
481 lines
12 KiB
C
481 lines
12 KiB
C
/*
|
|
+----------------------------------------------------------------------+
|
|
| PHP Version 5 |
|
|
+----------------------------------------------------------------------+
|
|
| Copyright (c) 1997-2016 The PHP Group |
|
|
+----------------------------------------------------------------------+
|
|
| This source file is subject to version 3.01 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_01.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: Thies C. Arntzen <thies@thieso.net> |
|
|
+----------------------------------------------------------------------+
|
|
*/
|
|
|
|
/* $Id$ */
|
|
|
|
/*
|
|
Based on CPANs "Text-Metaphone-1.96" by Michael G Schwern <schwern@pobox.com>
|
|
*/
|
|
|
|
#include "php.h"
|
|
#include "php_metaphone.h"
|
|
|
|
static int metaphone(unsigned char *word, int word_len, long max_phonemes, char **phoned_word, int traditional);
|
|
|
|
/* {{{ proto string metaphone(string text[, int phones])
|
|
Break english phrases down into their phonemes */
|
|
PHP_FUNCTION(metaphone)
|
|
{
|
|
char *str;
|
|
char *result = 0;
|
|
int str_len;
|
|
long phones = 0;
|
|
|
|
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s|l", &str, &str_len,
|
|
&phones) == FAILURE) {
|
|
return;
|
|
}
|
|
|
|
if (metaphone((unsigned char *)str, str_len, phones, &result, 1) == 0) {
|
|
RETVAL_STRING(result, 0);
|
|
} else {
|
|
if (result) {
|
|
efree(result);
|
|
}
|
|
RETURN_FALSE;
|
|
}
|
|
}
|
|
/* }}} */
|
|
|
|
/*
|
|
this is now the original code by Michael G Schwern:
|
|
i've changed it just a slightly bit (use emalloc,
|
|
get rid of includes etc)
|
|
- thies - 13.09.1999
|
|
*/
|
|
|
|
/*----------------------------- */
|
|
/* this used to be "metaphone.h" */
|
|
/*----------------------------- */
|
|
|
|
/* Special encodings */
|
|
#define SH 'X'
|
|
#define TH '0'
|
|
|
|
/*----------------------------- */
|
|
/* end of "metaphone.h" */
|
|
/*----------------------------- */
|
|
|
|
/*----------------------------- */
|
|
/* this used to be "metachar.h" */
|
|
/*----------------------------- */
|
|
|
|
/* Metachar.h ... little bits about characters for metaphone */
|
|
/*-- Character encoding array & accessing macros --*/
|
|
/* Stolen directly out of the book... */
|
|
char _codes[26] =
|
|
{
|
|
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
|
|
/* 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 */
|
|
};
|
|
|
|
|
|
#define ENCODE(c) (isalpha(c) ? _codes[((toupper(c)) - 'A')] : 0)
|
|
|
|
#define isvowel(c) (ENCODE(c) & 1) /* AEIOU */
|
|
|
|
/* These letters are passed through unchanged */
|
|
#define NOCHANGE(c) (ENCODE(c) & 2) /* FJMNR */
|
|
|
|
/* These form dipthongs when preceding H */
|
|
#define AFFECTH(c) (ENCODE(c) & 4) /* CGPST */
|
|
|
|
/* These make C and G soft */
|
|
#define MAKESOFT(c) (ENCODE(c) & 8) /* EIY */
|
|
|
|
/* These prevent GH from becoming F */
|
|
#define NOGHTOF(c) (ENCODE(c) & 16) /* BDH */
|
|
|
|
/*----------------------------- */
|
|
/* end of "metachar.h" */
|
|
/*----------------------------- */
|
|
|
|
/* I suppose I could have been using a character pointer instead of
|
|
* accesssing the array directly... */
|
|
|
|
/* Look at the next letter in the word */
|
|
#define Next_Letter (toupper(word[w_idx+1]))
|
|
/* Look at the current letter in the word */
|
|
#define Curr_Letter (toupper(word[w_idx]))
|
|
/* Go N letters back. */
|
|
#define Look_Back_Letter(n) (w_idx >= n ? toupper(word[w_idx-n]) : '\0')
|
|
/* Previous letter. I dunno, should this return null on failure? */
|
|
#define Prev_Letter (Look_Back_Letter(1))
|
|
/* Look two letters down. It makes sure you don't walk off the string. */
|
|
#define After_Next_Letter (Next_Letter != '\0' ? toupper(word[w_idx+2]) \
|
|
: '\0')
|
|
#define Look_Ahead_Letter(n) (toupper(Lookahead(word+w_idx, n)))
|
|
|
|
|
|
/* Allows us to safely look ahead an arbitrary # of letters */
|
|
/* I probably could have just used strlen... */
|
|
static char Lookahead(char *word, int how_far)
|
|
{
|
|
char letter_ahead = '\0'; /* null by default */
|
|
int idx;
|
|
for (idx = 0; word[idx] != '\0' && idx < how_far; idx++);
|
|
/* Edge forward in the string... */
|
|
|
|
letter_ahead = word[idx]; /* idx will be either == to how_far or
|
|
* at the end of the string
|
|
*/
|
|
return letter_ahead;
|
|
}
|
|
|
|
|
|
/* phonize one letter
|
|
* We don't know the buffers size in advance. On way to solve this is to just
|
|
* re-allocate the buffer size. We're using an extra of 2 characters (this
|
|
* could be one though; or more too). */
|
|
#define Phonize(c) { \
|
|
if (p_idx >= max_buffer_len) { \
|
|
*phoned_word = safe_erealloc(*phoned_word, 2, sizeof(char), max_buffer_len); \
|
|
max_buffer_len += 2; \
|
|
} \
|
|
(*phoned_word)[p_idx++] = c; \
|
|
}
|
|
/* Slap a null character on the end of the phoned word */
|
|
#define End_Phoned_Word { \
|
|
if (p_idx == max_buffer_len) { \
|
|
*phoned_word = safe_erealloc(*phoned_word, 1, sizeof(char), max_buffer_len); \
|
|
} \
|
|
(*phoned_word)[p_idx] = '\0'; \
|
|
}
|
|
/* How long is the phoned word? */
|
|
#define Phone_Len (p_idx)
|
|
|
|
/* Note is a letter is a 'break' in the word */
|
|
#define Isbreak(c) (!isalpha(c))
|
|
|
|
/* {{{ metaphone
|
|
*/
|
|
static int metaphone(unsigned char *word, int word_len, long max_phonemes, char **phoned_word, int traditional)
|
|
{
|
|
int w_idx = 0; /* point in the phonization we're at. */
|
|
int p_idx = 0; /* end of the phoned phrase */
|
|
int max_buffer_len = 0; /* maximum length of the destination buffer */
|
|
|
|
/*-- Parameter checks --*/
|
|
/* Negative phoneme length is meaningless */
|
|
|
|
if (max_phonemes < 0)
|
|
return -1;
|
|
|
|
/* Empty/null string is meaningless */
|
|
/* Overly paranoid */
|
|
/* assert(word != NULL && word[0] != '\0'); */
|
|
|
|
if (word == NULL)
|
|
return -1;
|
|
|
|
/*-- Allocate memory for our phoned_phrase --*/
|
|
if (max_phonemes == 0) { /* Assume largest possible */
|
|
max_buffer_len = word_len;
|
|
*phoned_word = safe_emalloc(sizeof(char), word_len, 1);
|
|
} else {
|
|
max_buffer_len = max_phonemes;
|
|
*phoned_word = safe_emalloc(sizeof(char), max_phonemes, 1);
|
|
}
|
|
|
|
|
|
/*-- The first phoneme has to be processed specially. --*/
|
|
/* Find our first letter */
|
|
for (; !isalpha(Curr_Letter); w_idx++) {
|
|
/* On the off chance we were given nothing but crap... */
|
|
if (Curr_Letter == '\0') {
|
|
End_Phoned_Word
|
|
return SUCCESS; /* For testing */
|
|
}
|
|
}
|
|
|
|
switch (Curr_Letter) {
|
|
/* AE becomes E */
|
|
case 'A':
|
|
if (Next_Letter == 'E') {
|
|
Phonize('E');
|
|
w_idx += 2;
|
|
}
|
|
/* Remember, preserve vowels at the beginning */
|
|
else {
|
|
Phonize('A');
|
|
w_idx++;
|
|
}
|
|
break;
|
|
/* [GKP]N becomes N */
|
|
case 'G':
|
|
case 'K':
|
|
case 'P':
|
|
if (Next_Letter == 'N') {
|
|
Phonize('N');
|
|
w_idx += 2;
|
|
}
|
|
break;
|
|
/* WH becomes W,
|
|
WR becomes R
|
|
W if followed by a vowel */
|
|
case 'W':
|
|
if (Next_Letter == 'R') {
|
|
Phonize(Next_Letter);
|
|
w_idx += 2;
|
|
} else if (Next_Letter == 'H' || isvowel(Next_Letter)) {
|
|
Phonize('W');
|
|
w_idx += 2;
|
|
}
|
|
/* else ignore */
|
|
break;
|
|
/* X becomes S */
|
|
case 'X':
|
|
Phonize('S');
|
|
w_idx++;
|
|
break;
|
|
/* Vowels are kept */
|
|
/* We did A already
|
|
case 'A':
|
|
case 'a':
|
|
*/
|
|
case 'E':
|
|
case 'I':
|
|
case 'O':
|
|
case 'U':
|
|
Phonize(Curr_Letter);
|
|
w_idx++;
|
|
break;
|
|
default:
|
|
/* do nothing */
|
|
break;
|
|
}
|
|
|
|
|
|
|
|
/* On to the metaphoning */
|
|
for (; Curr_Letter != '\0' &&
|
|
(max_phonemes == 0 || Phone_Len < max_phonemes);
|
|
w_idx++) {
|
|
/* How many letters to skip because an eariler encoding handled
|
|
* multiple letters */
|
|
unsigned short int skip_letter = 0;
|
|
|
|
|
|
/* THOUGHT: It would be nice if, rather than having things like...
|
|
* well, SCI. For SCI you encode the S, then have to remember
|
|
* to skip the C. So the phonome SCI invades both S and C. It would
|
|
* be better, IMHO, to skip the C from the S part of the encoding.
|
|
* Hell, I'm trying it.
|
|
*/
|
|
|
|
/* Ignore non-alphas */
|
|
if (!isalpha(Curr_Letter))
|
|
continue;
|
|
|
|
/* Drop duplicates, except CC */
|
|
if (Curr_Letter == Prev_Letter &&
|
|
Curr_Letter != 'C')
|
|
continue;
|
|
|
|
switch (Curr_Letter) {
|
|
/* B -> B unless in MB */
|
|
case 'B':
|
|
if (Prev_Letter != 'M')
|
|
Phonize('B');
|
|
break;
|
|
/* 'sh' if -CIA- or -CH, but not SCH, except SCHW.
|
|
* (SCHW is handled in S)
|
|
* S if -CI-, -CE- or -CY-
|
|
* dropped if -SCI-, SCE-, -SCY- (handed in S)
|
|
* else K
|
|
*/
|
|
case 'C':
|
|
if (MAKESOFT(Next_Letter)) { /* C[IEY] */
|
|
if (After_Next_Letter == 'A' &&
|
|
Next_Letter == 'I') { /* CIA */
|
|
Phonize(SH);
|
|
}
|
|
/* SC[IEY] */
|
|
else if (Prev_Letter == 'S') {
|
|
/* Dropped */
|
|
} else {
|
|
Phonize('S');
|
|
}
|
|
} else if (Next_Letter == 'H') {
|
|
if ((!traditional) && (After_Next_Letter == 'R' || Prev_Letter == 'S')) { /* Christ, School */
|
|
Phonize('K');
|
|
} else {
|
|
Phonize(SH);
|
|
}
|
|
skip_letter++;
|
|
} else {
|
|
Phonize('K');
|
|
}
|
|
break;
|
|
/* J if in -DGE-, -DGI- or -DGY-
|
|
* else T
|
|
*/
|
|
case 'D':
|
|
if (Next_Letter == 'G' &&
|
|
MAKESOFT(After_Next_Letter)) {
|
|
Phonize('J');
|
|
skip_letter++;
|
|
} else
|
|
Phonize('T');
|
|
break;
|
|
/* F if in -GH and not B--GH, D--GH, -H--GH, -H---GH
|
|
* else dropped if -GNED, -GN,
|
|
* else dropped if -DGE-, -DGI- or -DGY- (handled in D)
|
|
* else J if in -GE-, -GI, -GY and not GG
|
|
* else K
|
|
*/
|
|
case 'G':
|
|
if (Next_Letter == 'H') {
|
|
if (!(NOGHTOF(Look_Back_Letter(3)) ||
|
|
Look_Back_Letter(4) == 'H')) {
|
|
Phonize('F');
|
|
skip_letter++;
|
|
} else {
|
|
/* silent */
|
|
}
|
|
} else if (Next_Letter == 'N') {
|
|
if (Isbreak(After_Next_Letter) ||
|
|
(After_Next_Letter == 'E' &&
|
|
Look_Ahead_Letter(3) == 'D')) {
|
|
/* dropped */
|
|
} else
|
|
Phonize('K');
|
|
} else if (MAKESOFT(Next_Letter) &&
|
|
Prev_Letter != 'G') {
|
|
Phonize('J');
|
|
} else {
|
|
Phonize('K');
|
|
}
|
|
break;
|
|
/* H if before a vowel and not after C,G,P,S,T */
|
|
case 'H':
|
|
if (isvowel(Next_Letter) &&
|
|
!AFFECTH(Prev_Letter))
|
|
Phonize('H');
|
|
break;
|
|
/* dropped if after C
|
|
* else K
|
|
*/
|
|
case 'K':
|
|
if (Prev_Letter != 'C')
|
|
Phonize('K');
|
|
break;
|
|
/* F if before H
|
|
* else P
|
|
*/
|
|
case 'P':
|
|
if (Next_Letter == 'H') {
|
|
Phonize('F');
|
|
} else {
|
|
Phonize('P');
|
|
}
|
|
break;
|
|
/* K
|
|
*/
|
|
case 'Q':
|
|
Phonize('K');
|
|
break;
|
|
/* 'sh' in -SH-, -SIO- or -SIA- or -SCHW-
|
|
* else S
|
|
*/
|
|
case 'S':
|
|
if (Next_Letter == 'I' &&
|
|
(After_Next_Letter == 'O' ||
|
|
After_Next_Letter == 'A')) {
|
|
Phonize(SH);
|
|
} else if (Next_Letter == 'H') {
|
|
Phonize(SH);
|
|
skip_letter++;
|
|
} else if ((!traditional) && (Next_Letter == 'C' && Look_Ahead_Letter(2) == 'H' && Look_Ahead_Letter(3) == 'W')) {
|
|
Phonize(SH);
|
|
skip_letter += 2;
|
|
} else {
|
|
Phonize('S');
|
|
}
|
|
break;
|
|
/* 'sh' in -TIA- or -TIO-
|
|
* else 'th' before H
|
|
* else T
|
|
*/
|
|
case 'T':
|
|
if (Next_Letter == 'I' &&
|
|
(After_Next_Letter == 'O' ||
|
|
After_Next_Letter == 'A')) {
|
|
Phonize(SH);
|
|
} else if (Next_Letter == 'H') {
|
|
Phonize(TH);
|
|
skip_letter++;
|
|
} else if (!(Next_Letter == 'C' && After_Next_Letter == 'H')) {
|
|
Phonize('T');
|
|
}
|
|
break;
|
|
/* F */
|
|
case 'V':
|
|
Phonize('F');
|
|
break;
|
|
/* W before a vowel, else dropped */
|
|
case 'W':
|
|
if (isvowel(Next_Letter))
|
|
Phonize('W');
|
|
break;
|
|
/* KS */
|
|
case 'X':
|
|
Phonize('K');
|
|
Phonize('S');
|
|
break;
|
|
/* Y if followed by a vowel */
|
|
case 'Y':
|
|
if (isvowel(Next_Letter))
|
|
Phonize('Y');
|
|
break;
|
|
/* S */
|
|
case 'Z':
|
|
Phonize('S');
|
|
break;
|
|
/* No transformation */
|
|
case 'F':
|
|
case 'J':
|
|
case 'L':
|
|
case 'M':
|
|
case 'N':
|
|
case 'R':
|
|
Phonize(Curr_Letter);
|
|
break;
|
|
default:
|
|
/* nothing */
|
|
break;
|
|
} /* END SWITCH */
|
|
|
|
w_idx += skip_letter;
|
|
} /* END FOR */
|
|
|
|
End_Phoned_Word;
|
|
|
|
return 0;
|
|
} /* END metaphone */
|
|
/* }}} */
|
|
|
|
/*
|
|
* Local variables:
|
|
* tab-width: 4
|
|
* c-basic-offset: 4
|
|
* End:
|
|
* vim600: sw=4 ts=4 fdm=marker
|
|
* vim<600: sw=4 ts=4
|
|
*/
|