src/lib-fts/fts-filter-lowercase.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"

#ifdef HAVE_LIBICU
#  include "fts-icu.h"
#  include "fts-filter-common.h"
#endif

static int
fts_filter_lowercase_create(const struct fts_language *lang ATTR_UNUSED,
                            const char *const *settings,
                            struct fts_filter **filter_r,
                            const char **error_r)
{
    struct fts_filter *filter;
    unsigned int i, max_length = 250;

    for (i = 0; settings[i] != NULL; i += 2) {
        const char *key = settings[i], *value = settings[i+1];

        if (strcmp(key, "maxlen") == 0) {
            if (str_to_uint(value, &max_length) < 0 ||
                max_length == 0) {
                *error_r = t_strdup_printf("Invalid lowercase filter maxlen setting: %s", value);
                return -1;
            }
        }
        else {
            *error_r = t_strdup_printf("Unknown setting: %s", key);
            return -1;
        }
    }
    filter = i_new(struct fts_filter, 1);
    *filter = *fts_filter_lowercase;
    filter->token = str_new(default_pool, 64);
    filter->max_length = max_length;

    *filter_r = filter;
    return 0;
}

static int
fts_filter_lowercase_filter(struct fts_filter *filter ATTR_UNUSED,
                            const char **token,
                            const char **error_r ATTR_UNUSED)
{
#ifdef HAVE_LIBICU
    str_truncate(filter->token, 0);
    fts_icu_lcase(filter->token, *token);
    fts_filter_truncate_token(filter->token, filter->max_length);
    *token = str_c(filter->token);
#else
    *token = t_str_lcase(*token);
#endif
    return 1;
}

static const struct fts_filter fts_filter_lowercase_real = {
    .class_name = "lowercase",
    .v = {
        fts_filter_lowercase_create,
        fts_filter_lowercase_filter,
        NULL
    }
};

const struct fts_filter *fts_filter_lowercase = &fts_filter_lowercase_real;