| 1 | /**************************************************************************
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| 2 | *
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| 3 | * simplefrenchstem.c -- a simple french stemmer
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| 4 | *
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| 5 | * This program is free software; you can redistribute it and/or modify
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| 6 | * it under the terms of the GNU General Public License as published by
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| 7 | * the Free Software Foundation; either version 2 of the License, or
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| 8 | * (at your option) any later version.
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| 9 | *
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| 10 | * This program is distributed in the hope that it will be useful,
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| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | * GNU General Public License for more details.
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| 14 | *
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| 15 | * You should have received a copy of the GNU General Public License
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| 16 | * along with this program; if not, write to the Free Software
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| 17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 18 | *
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| 19 | **************************************************************************/
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| 20 |
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| 21 | #include "unitool.h"
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| 22 | #include "simplefrenchstem.h"
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| 23 |
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| 24 |
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| 25 |
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| 26 | /* =========================================================================
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| 27 | * Function: simplefrenchstem
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| 28 | * Description: a simple french stemmer
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| 29 | * Input: a word string with the length in the first byte
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| 30 | * Output: the stemmed word
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| 31 | * ========================================================================= */
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| 32 |
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| 33 | void simplefrenchstem (unsigned char *word) {
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| 34 | unsigned short out[256]; /* temp space */
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| 35 | unsigned short *wordstart; /* points to first letter of word */
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| 36 | int last; /* last points to the last character */
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| 37 |
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| 38 | /* decode */
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| 39 | utf8_word_to_unicode (word, out, 255);
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| 40 | wordstart = out + 1;
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| 41 | last = out[0]-1;
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| 42 |
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| 43 |
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| 44 | if (last > 4) {
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| 45 | if (wordstart[last]=='x') {
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| 46 | if (wordstart[last-1]=='u' && wordstart[last-2]=='a') {
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| 47 | wordstart[last-1]='l';
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| 48 | }
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| 49 | last--;
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| 50 |
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| 51 | } else {
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| 52 | if (last>=0 && wordstart[last]=='s') last--;
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| 53 | if (last>=0 && wordstart[last]=='r') last--;
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| 54 | if (last>=0 && wordstart[last]=='e') last--;
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| 55 |
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| 56 | /* letter with accent e + ' -- there are two possible encodings */
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| 57 | if (last>=0 && wordstart[last]==0xe9) {
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| 58 | last--;
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| 59 | } else if (last>=1 && wordstart[last-1]=='e' && wordstart[last]==0x301) {
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| 60 | last -= 2;
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| 61 | }
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| 62 |
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| 63 | if (last >= 1 && wordstart[last]==wordstart[last-1]) last--;
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| 64 | } /* end else */
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| 65 |
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| 66 | out[0] = (unsigned char)(last+1);
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| 67 | } /* end if (len > 4) */
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| 68 |
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| 69 | /* re-code, make sure the result is not longer than the input */
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| 70 | unicode_to_utf8_word (out, word, word[0]+1);
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| 71 | }
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