src/lib-fts/fts-filter-english-possessive.c

/* Copyright (c) 2015-2018 Dovecot authors, see the included COPYING file */

#include "lib.h"
#include "unichar.h"
#include "fts-common.h"
#include "fts-filter-private.h"

static unichar_t get_ending_utf8_char(const char *str, size_t *end_pos)
{
    unichar_t c;

    while (!UTF8_IS_START_SEQ(str[*end_pos])) {
        i_assert(*end_pos > 0);
        *end_pos -= 1;
    }
    if (uni_utf8_get_char(str + *end_pos, &c) <= 0)
        i_unreached();
    return c;
}

static int
fts_filter_english_possessive_filter(struct fts_filter *filter ATTR_UNUSED,
                     const char **token,
                     const char **error_r ATTR_UNUSED)
{
    size_t len = strlen(*token);
    unichar_t c;

    if (len > 1 && ((*token)[len-1] == 's' || (*token)[len-1] == 'S')) {
        len -= 2;
        c = get_ending_utf8_char(*token, &len);
        if (IS_APOSTROPHE(c))
            *token = t_strndup(*token, len);
    }
    return 1;
}

static const struct fts_filter fts_filter_english_possessive_real = {
    .class_name = "english-possessive",
    .v = {
        NULL,
        fts_filter_english_possessive_filter,
        NULL
    }
};

const struct fts_filter *fts_filter_english_possessive = &fts_filter_english_possessive_real;