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465 lines
11 KiB
C
465 lines
11 KiB
C
/*
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+----------------------------------------------------------------------+
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| PHP version 4.0 |
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+----------------------------------------------------------------------+
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| Copyright (c) 1997, 1998, 1999, 2000 The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 2.01 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available at through the world-wide-web at |
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| http://www.php.net/license/2_01.txt. |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Thies C. Arntzen <thies@digicol.de> |
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+----------------------------------------------------------------------+
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*/
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/*
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Based on CPANs "Text-Metaphone-1.96" by Michael G Schwern <schwern@pobox.com>
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*/
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#include "php.h"
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#include "php_metaphone.h"
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static int metaphone(char *word, int max_phonemes, char **phoned_word, int traditional);
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PHP_FUNCTION(metaphone);
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/* metaphone -- Breaks english phrases down into their phonemes. */
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PHP_FUNCTION(metaphone)
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{
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pval **pstr, **pphones;
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char *result = 0;
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int phones = 0;
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if (zend_get_parameters_ex(2, &pstr, &pphones) == SUCCESS) {
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convert_to_long_ex(pphones);
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phones = (*pphones)->value.lval;
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} else if (zend_get_parameters_ex(1, &pstr) == FAILURE) {
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WRONG_PARAM_COUNT;
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}
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convert_to_string_ex(pstr);
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if (metaphone((*pstr)->value.str.val, phones, &result, 1) == 0) {
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RETVAL_STRING(result, 0);
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} else {
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if (result) {
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efree(result);
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}
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RETURN_FALSE;
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}
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}
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/*
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this is now the original code by Michael G Schwern:
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i've changed it just a slightly bit (use emalloc,
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get rid of includes etc)
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- thies - 13.09.1999
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*/
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/*----------------------------- */
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/* this used to be "metaphone.h" */
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/*----------------------------- */
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/* Special encodings */
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#define SH 'X'
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#define TH '0'
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/*----------------------------- */
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/* end of "metaphone.h" */
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/*----------------------------- */
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/*----------------------------- */
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/* this used to be "metachar.h" */
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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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{
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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(c) ? _codes[((toupper(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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/*----------------------------- */
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/* end of "metachar.h" */
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/*----------------------------- */
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/* I suppose I could have been using a character pointer instead of
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* accesssing the array directly... */
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/* Look at the next letter in the word */
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#define Next_Letter (toupper(word[w_idx+1]))
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/* Look at the current letter in the word */
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#define Curr_Letter (toupper(word[w_idx]))
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/* Go N letters back. */
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#define Look_Back_Letter(n) (w_idx >= n ? toupper(word[w_idx-n]) : '\0')
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/* Previous letter. I dunno, should this return null on failure? */
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#define Prev_Letter (Look_Back_Letter(1))
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/* Look two letters down. It makes sure you don't walk off the string. */
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#define After_Next_Letter (Next_Letter != '\0' ? toupper(word[w_idx+2]) \
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: '\0')
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#define Look_Ahead_Letter(n) (toupper(Lookahead(word+w_idx, n)))
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/* Allows us to safely look ahead an arbitrary # of letters */
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/* I probably could have just used strlen... */
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static char Lookahead(char *word, int how_far)
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{
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char letter_ahead = '\0'; /* null by default */
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int idx;
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for (idx = 0; word[idx] != '\0' && idx < how_far; idx++);
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/* Edge forward in the string... */
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letter_ahead = word[idx]; /* idx will be either == to how_far or
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* at the end of the string
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*/
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return letter_ahead;
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}
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/* phonize one letter */
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#define Phonize(c) {(*phoned_word)[p_idx++] = c;}
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/* Slap a null character on the end of the phoned word */
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#define End_Phoned_Word {(*phoned_word)[p_idx] = '\0';}
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/* How long is the phoned word? */
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#define Phone_Len (p_idx)
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/* Note is a letter is a 'break' in the word */
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#define Isbreak(c) (!isalpha(c))
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static int metaphone(char *word, int max_phonemes, char **phoned_word, int traditional)
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{
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int w_idx = 0; /* point in the phonization we're at. */
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int p_idx = 0; /* end of the phoned phrase */
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/*-- Parameter checks --*/
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/* Negative phoneme length is meaningless */
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if (max_phonemes < 0)
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return -1;
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/* Empty/null string is meaningless */
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/* Overly paranoid */
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/* assert(word != NULL && word[0] != '\0'); */
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if (word == NULL)
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return -1;
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/*-- Allocate memory for our phoned_phrase --*/
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if (max_phonemes == 0) { /* Assume largest possible */
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*phoned_word = emalloc(sizeof(char) * strlen(word) + 1);
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if (!*phoned_word)
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return -1;
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} else {
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*phoned_word = emalloc(sizeof(char) * max_phonemes + 1);
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if (!*phoned_word)
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return -1;
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}
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/*-- The first phoneme has to be processed specially. --*/
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/* Find our first letter */
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for (; !isalpha(Curr_Letter); w_idx++) {
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/* On the off chance we were given nothing but crap... */
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if (Curr_Letter == '\0') {
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End_Phoned_Word
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return SUCCESS; /* For testing */
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}
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}
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switch (Curr_Letter) {
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/* AE becomes E */
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case 'A':
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if (Next_Letter == 'E') {
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Phonize('E');
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w_idx += 2;
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}
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/* Remember, preserve vowels at the beginning */
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else {
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Phonize('A');
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w_idx++;
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}
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break;
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/* [GKP]N becomes N */
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case 'G':
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case 'K':
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case 'P':
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if (Next_Letter == 'N') {
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Phonize('N');
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w_idx += 2;
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}
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break;
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/* WH becomes H,
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WR becomes R
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W if followed by a vowel */
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case 'W':
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if (Next_Letter == 'H' ||
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Next_Letter == 'R') {
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Phonize(Next_Letter);
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w_idx += 2;
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} else if (isvowel(Next_Letter)) {
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Phonize('W');
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w_idx += 2;
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}
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/* else ignore */
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break;
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/* X becomes S */
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case 'X':
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Phonize('S');
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w_idx++;
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break;
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/* Vowels are kept */
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/* We did A already
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case 'A':
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case 'a':
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*/
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case 'E':
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case 'I':
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case 'O':
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case 'U':
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Phonize(Curr_Letter);
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w_idx++;
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break;
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default:
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/* do nothing */
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break;
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}
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/* On to the metaphoning */
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for (; Curr_Letter != '\0' &&
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(max_phonemes == 0 || Phone_Len < max_phonemes);
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w_idx++) {
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/* How many letters to skip because an eariler encoding handled
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* multiple letters */
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unsigned short int skip_letter = 0;
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/* THOUGHT: It would be nice if, rather than having things like...
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* well, SCI. For SCI you encode the S, then have to remember
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* to skip the C. So the phonome SCI invades both S and C. It would
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* be better, IMHO, to skip the C from the S part of the encoding.
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* Hell, I'm trying it.
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*/
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/* Ignore non-alphas */
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if (!isalpha(Curr_Letter))
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continue;
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/* Drop duplicates, except CC */
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if (Curr_Letter == Prev_Letter &&
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Curr_Letter != 'C')
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continue;
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switch (Curr_Letter) {
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/* B -> B unless in MB */
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case 'B':
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if (Prev_Letter != 'M')
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Phonize('B');
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break;
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/* 'sh' if -CIA- or -CH, but not SCH, except SCHW.
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* (SCHW is handled in S)
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* S if -CI-, -CE- or -CY-
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* dropped if -SCI-, SCE-, -SCY- (handed in S)
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* else K
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*/
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case 'C':
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if (MAKESOFT(Next_Letter)) { /* C[IEY] */
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if (After_Next_Letter == 'A' &&
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Next_Letter == 'I') { /* CIA */
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Phonize(SH);
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}
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/* SC[IEY] */
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else if (Prev_Letter == 'S') {
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/* Dropped */
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} else {
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Phonize('S');
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}
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} else if (Next_Letter == 'H') {
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if ((!traditional) && (After_Next_Letter == 'R' || Prev_Letter == 'S')) { /* Christ, School */
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Phonize('K');
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} else {
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Phonize(SH);
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}
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skip_letter++;
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} else {
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Phonize('K');
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}
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break;
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/* J if in -DGE-, -DGI- or -DGY-
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* else T
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*/
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case 'D':
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if (Next_Letter == 'G' &&
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MAKESOFT(After_Next_Letter)) {
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Phonize('J');
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skip_letter++;
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} else
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Phonize('T');
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break;
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/* F if in -GH and not B--GH, D--GH, -H--GH, -H---GH
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* else dropped if -GNED, -GN,
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* else dropped if -DGE-, -DGI- or -DGY- (handled in D)
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* else J if in -GE-, -GI, -GY and not GG
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* else K
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*/
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case 'G':
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if (Next_Letter == 'H') {
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if (!(NOGHTOF(Look_Back_Letter(3)) ||
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Look_Back_Letter(4) == 'H')) {
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Phonize('F');
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skip_letter++;
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} else {
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/* silent */
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}
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} else if (Next_Letter == 'N') {
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if (Isbreak(After_Next_Letter) ||
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(After_Next_Letter == 'E' &&
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Look_Ahead_Letter(3) == 'D')) {
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/* dropped */
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} else
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Phonize('K');
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} else if (MAKESOFT(Next_Letter) &&
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Prev_Letter != 'G') {
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Phonize('J');
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} else {
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Phonize('K');
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}
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break;
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/* H if before a vowel and not after C,G,P,S,T */
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case 'H':
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if (isvowel(Next_Letter) &&
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!AFFECTH(Prev_Letter))
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Phonize('H');
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break;
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/* dropped if after C
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* else K
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*/
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case 'K':
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if (Prev_Letter != 'C')
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Phonize('K');
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break;
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/* F if before H
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* else P
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*/
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case 'P':
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if (Next_Letter == 'H') {
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Phonize('F');
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} else {
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Phonize('P');
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}
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break;
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/* K
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*/
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case 'Q':
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Phonize('K');
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break;
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/* 'sh' in -SH-, -SIO- or -SIA- or -SCHW-
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* else S
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*/
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case 'S':
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if (Next_Letter == 'I' &&
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(After_Next_Letter == 'O' ||
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After_Next_Letter == 'A')) {
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Phonize(SH);
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} else if (Next_Letter == 'H') {
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Phonize(SH);
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skip_letter++;
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} else if ((!traditional) && (Next_Letter == 'C' && Look_Ahead_Letter(2) == 'H' && Look_Ahead_Letter(3) == 'W')) {
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Phonize(SH);
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skip_letter += 2;
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} else {
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Phonize('S');
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}
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break;
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/* 'sh' in -TIA- or -TIO-
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* else 'th' before H
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* else T
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*/
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case 'T':
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if (Next_Letter == 'I' &&
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(After_Next_Letter == 'O' ||
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After_Next_Letter == 'A')) {
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Phonize(SH);
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} else if (Next_Letter == 'H') {
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Phonize(TH);
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skip_letter++;
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} else {
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Phonize('T');
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}
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break;
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/* F */
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case 'V':
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Phonize('F');
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break;
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/* W before a vowel, else dropped */
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case 'W':
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if (isvowel(Next_Letter))
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Phonize('W');
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break;
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/* KS */
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case 'X':
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Phonize('K');
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Phonize('S');
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break;
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/* Y if followed by a vowel */
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case 'Y':
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if (isvowel(Next_Letter))
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Phonize('Y');
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break;
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/* S */
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case 'Z':
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Phonize('S');
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break;
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/* No transformation */
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case 'F':
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case 'J':
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case 'L':
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case 'M':
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case 'N':
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case 'R':
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Phonize(Curr_Letter);
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break;
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default:
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/* nothing */
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break;
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} /* END SWITCH */
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w_idx += skip_letter;
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} /* END FOR */
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End_Phoned_Word;
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return 0;
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} /* END metaphone */
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/*
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* End:
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*/
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