src/lib-fts/fts-filter-contractions.c

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

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

static int
fts_filter_contractions_create(const struct fts_language *lang,
                   const char *const *settings,
                   struct fts_filter **filter_r,
                   const char **error_r)
{
    struct fts_filter *filter;

    if (settings[0] != NULL) {
        *error_r = t_strdup_printf("Unknown setting: %s", settings[0]);
        return -1;
    }
    if (strcmp(lang->name, "fr") != 0) {
        *error_r = t_strdup_printf("Unsupported language: %s", lang->name);
        return -1;
    }

    filter = i_new(struct fts_filter, 1);
    *filter = *fts_filter_contractions;
    filter->token = str_new(default_pool, 64);
    *filter_r = filter;
    return 0;
}

static int
fts_filter_contractions_filter(struct fts_filter *filter ATTR_UNUSED,
                const char **_token,
                const char **error_r ATTR_UNUSED)
{
    int char_size, pos = 0;
    unichar_t apostrophe;
    const char *token = *_token;

    switch (token[pos]) {
    case 'q':
        pos++;
        if (token[pos] == '\0' || token[pos] != 'u')
            break;
        /* fall through */
    case 'c':
    case 'd':
    case 'j':
    case 'l':
    case 'm':
    case 'n':
    case 's':
    case 't':
        pos++;
        if (token[pos] == '\0')
            break;
        char_size = uni_utf8_get_char(token + pos, &apostrophe);
        if (IS_APOSTROPHE(apostrophe)) {
            pos += char_size;
            *_token = token + pos;
        }
        if (token[pos] == '\0') /* nothing left */
            return 0;
        break;
    default:
        /* do nothing */
        break;
    }

    return 1;
}

static const struct fts_filter fts_filter_contractions_real = {
    .class_name = "contractions",
    .v = {
        fts_filter_contractions_create,
        fts_filter_contractions_filter,
        NULL
    }
};

const struct fts_filter *fts_filter_contractions = &fts_filter_contractions_real;