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/*
Copyright (C) 2024 Sutou Kouhei <kou@clear-code.com>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef GRN_EMBEDDED
# define GRN_PLUGIN_FUNCTION_TAG tokenizers_h3_index
#endif
#include <groonga.h>
#include <groonga/tokenizer.h>
static const char *grn_h3_index_tag = "[tokenizer][h3-index]";
typedef struct {
uint8_t resolution;
} grn_h3_index_options;
static void
grn_h3_index_options_init(grn_ctx *ctx,
grn_h3_index_options *options,
int32_t resolution)
{
options->resolution = resolution;
}
static void
grn_h3_index_options_fin(grn_ctx *ctx, grn_h3_index_options *options)
{
}
typedef struct {
grn_h3_index_options options;
grn_geo_point geo_point;
uint64_t index;
} grn_h3_index_tokenizer;
static void
grn_h3_index_close_options(grn_ctx *ctx, void *data)
{
grn_h3_index_options *options = data;
grn_h3_index_options_fin(ctx, options);
GRN_PLUGIN_FREE(ctx, options);
}
static void *
grn_h3_index_open_options(grn_ctx *ctx,
grn_obj *tokenizer,
grn_obj *raw_options,
void *user_data)
{
grn_h3_index_options *options =
GRN_PLUGIN_CALLOC(ctx, sizeof(grn_h3_index_options));
if (!options) {
GRN_PLUGIN_ERROR(ctx,
GRN_NO_MEMORY_AVAILABLE,
"%s failed to allocate memory for options",
grn_h3_index_tag);
return NULL;
}
grn_h3_index_options_init(ctx, options, 15);
GRN_OPTION_VALUES_EACH_BEGIN(ctx, raw_options, i, name, name_length)
{
grn_raw_string name_raw;
name_raw.value = name;
name_raw.length = name_length;
if (GRN_RAW_STRING_EQUAL_CSTRING(name_raw, "resolution")) {
options->resolution =
grn_vector_get_element_uint8(ctx, raw_options, i, options->resolution);
}
}
GRN_OPTION_VALUES_EACH_END();
return options;
}
static void
grn_h3_index_fin(grn_ctx *ctx, void *user_data)
{
grn_h3_index_tokenizer *tokenizer = user_data;
if (!tokenizer) {
return;
}
GRN_PLUGIN_FREE(ctx, tokenizer);
}
static void *
grn_h3_index_init(grn_ctx *ctx, grn_tokenizer_query *query)
{
grn_geo_point geo_point;
size_t query_size;
grn_id query_domain;
const char *raw_query =
grn_tokenizer_query_get_data(ctx, query, &query_size, &query_domain);
if (query_domain == GRN_DB_WGS84_GEO_POINT) {
if (query_size != sizeof(grn_geo_point)) {
GRN_PLUGIN_ERROR(ctx,
GRN_INVALID_ARGUMENT,
"%s query must be a WGS84GeoPoint: %zu != %zu",
grn_h3_index_tag,
query_size,
sizeof(grn_geo_point));
return NULL;
}
geo_point = *((const grn_geo_point *)raw_query);
} else {
if (grn_type_id_is_text_family(ctx, query_domain)) {
grn_obj text_geo_point;
GRN_TEXT_INIT(&text_geo_point, GRN_OBJ_DO_SHALLOW_COPY);
GRN_TEXT_SET(ctx, &text_geo_point, raw_query, query_size);
grn_obj geo_point_buffer;
GRN_WGS84_GEO_POINT_INIT(&geo_point_buffer, 0);
grn_rc rc = grn_obj_cast(ctx, &text_geo_point, &geo_point_buffer, false);
if (rc != GRN_SUCCESS) {
GRN_OBJ_FIN(ctx, &geo_point_buffer);
GRN_PLUGIN_ERROR(
ctx,
rc,
"%s query must be valid WGS84GeoPoint text representation: <%.*s>",
grn_h3_index_tag,
(int)query_size,
raw_query);
return NULL;
}
GRN_GEO_POINT_VALUE(&geo_point_buffer,
geo_point.latitude,
geo_point.longitude);
GRN_OBJ_FIN(ctx, &geo_point_buffer);
} else {
GRN_PLUGIN_ERROR(ctx,
GRN_INVALID_ARGUMENT,
"%s query must be WGS84GeoPoint: %s(%u)",
grn_h3_index_tag,
grn_type_id_to_string_builtin(ctx, query_domain),
query_domain);
return NULL;
}
}
grn_obj *lexicon = grn_tokenizer_query_get_lexicon(ctx, query);
grn_h3_index_options *options =
grn_table_cache_default_tokenizer_options(ctx,
lexicon,
grn_h3_index_open_options,
grn_h3_index_close_options,
query);
if (ctx->rc != GRN_SUCCESS) {
return NULL;
}
grn_h3_index_tokenizer *tokenizer =
GRN_PLUGIN_CALLOC(ctx, sizeof(grn_h3_index_tokenizer));
if (!tokenizer) {
GRN_PLUGIN_ERROR(ctx,
GRN_NO_MEMORY_AVAILABLE,
"%s failed to allocate tokenizer",
grn_h3_index_tag);
return NULL;
}
tokenizer->options = *options;
tokenizer->geo_point = geo_point;
return tokenizer;
}
static void
grn_h3_index_next(grn_ctx *ctx,
grn_tokenizer_query *query,
grn_token *token,
void *user_data)
{
grn_h3_index_tokenizer *tokenizer = user_data;
tokenizer->index = grn_h3_compute_cell(ctx,
&(tokenizer->geo_point),
tokenizer->options.resolution,
grn_h3_index_tag);
if (ctx->rc != GRN_SUCCESS) {
return;
}
grn_token_set_data(ctx,
token,
(const char *)&(tokenizer->index),
sizeof(uint64_t));
grn_token_set_domain(ctx, token, GRN_DB_UINT64);
grn_token_set_status(ctx, token, GRN_TOKEN_LAST);
}
grn_rc
GRN_PLUGIN_INIT(grn_ctx *ctx)
{
return GRN_SUCCESS;
}
grn_rc
GRN_PLUGIN_REGISTER(grn_ctx *ctx)
{
grn_obj *tokenizer = grn_tokenizer_create(ctx, "TokenH3Index", -1);
if (tokenizer) {
grn_tokenizer_set_init_func(ctx, tokenizer, grn_h3_index_init);
grn_tokenizer_set_next_func(ctx, tokenizer, grn_h3_index_next);
grn_tokenizer_set_fin_func(ctx, tokenizer, grn_h3_index_fin);
}
return ctx->rc;
}
grn_rc
GRN_PLUGIN_FIN(grn_ctx *ctx)
{
return GRN_SUCCESS;
}
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