/*
  Copyright(C) 2012-2018  Brazil
  Copyright(C) 2020-2021  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
*/

#pragma once

#include <groonga/plugin.h>
#include <groonga/tokenizer_query_deprecated.h>

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

#define GRN_TOKENIZER_TOKENIZED_DELIMITER_UTF8     "\xEF\xBF\xBE"
#define GRN_TOKENIZER_TOKENIZED_DELIMITER_UTF8_LEN 3

#define GRN_TOKENIZER_BEGIN_MARK_UTF8              "\xEF\xBF\xAF"
#define GRN_TOKENIZER_BEGIN_MARK_UTF8_LEN          3
#define GRN_TOKENIZER_END_MARK_UTF8                "\xEF\xBF\xB0"
#define GRN_TOKENIZER_END_MARK_UTF8_LEN            3

/*
  grn_tokenizer_charlen() returns the length (#bytes) of the first character
  in the string specified by `str_ptr' and `str_length'. If the starting bytes
  are invalid as a character, grn_tokenizer_charlen() returns 0. See
  grn_encoding in "groonga.h" for more details of `encoding'

  Deprecated. Use grn_plugin_charlen() instead.
 */
int
grn_tokenizer_charlen(grn_ctx *ctx,
                      const char *str_ptr,
                      unsigned int str_length,
                      grn_encoding encoding);

/*
  grn_tokenizer_isspace() returns the length (#bytes) of the first character
  in the string specified by `str_ptr' and `str_length' if it is a space
  character. Otherwise, grn_tokenizer_isspace() returns 0.

  Deprecated. Use grn_plugin_isspace() instead.
 */
int
grn_tokenizer_isspace(grn_ctx *ctx,
                      const char *str_ptr,
                      unsigned int str_length,
                      grn_encoding encoding);

/*
  grn_tokenizer_is_tokenized_delimiter() returns whether is the first
  character in the string specified by `str_ptr' and `str_length' the
  special tokenized delimiter character or not.
 */
grn_bool
grn_tokenizer_is_tokenized_delimiter(grn_ctx *ctx,
                                     const char *str_ptr,
                                     unsigned int str_length,
                                     grn_encoding encoding);

/*
  grn_tokenizer_have_tokenized_delimiter() returns whether is there
  the special delimiter character in the string specified by `str_ptr'
  and `str_length' the special tokenized delimiter character or not.
 */
GRN_PLUGIN_EXPORT grn_bool
grn_tokenizer_have_tokenized_delimiter(grn_ctx *ctx,
                                       const char *str_ptr,
                                       unsigned int str_length,
                                       grn_encoding encoding);

/*
  grn_tokenizer_query_open() parses `args' and returns a new object of
  grn_tokenizer_query. The new object stores information of the query.
  grn_tokenizer_query_open() normalizes the query if the target table
  requires normalization. grn_tokenizer_query_open() returns NULL if
  something goes wrong. Note that grn_tokenizer_query_open() must be called
  just once in the function that initializes a tokenizer.

  See `GRN_STRING_*' flags for `normalize_flags'.
 */
GRN_PLUGIN_EXPORT grn_tokenizer_query *
grn_tokenizer_query_open(grn_ctx *ctx,
                         int num_args,
                         grn_obj **args,
                         uint32_t normalize_flags);

/*
  grn_tokenizer_query_create() is deprecated. Use grn_tokenizer_query_open()
  instead.
*/

grn_tokenizer_query *
grn_tokenizer_query_create(grn_ctx *ctx, int num_args, grn_obj **args);

/*
  grn_tokenizer_query_close() finalizes an object of grn_tokenizer_query
  and then frees memory allocated for that object.
 */
GRN_PLUGIN_EXPORT void
grn_tokenizer_query_close(grn_ctx *ctx, grn_tokenizer_query *query);

/*
  grn_tokenizer_query_destroy() is deprecated. Use grn_tokenizer_query_close()
  instead.
 */
void
grn_tokenizer_query_destroy(grn_ctx *ctx, grn_tokenizer_query *query);

GRN_PLUGIN_EXPORT grn_rc
grn_tokenizer_query_set_normalize_flags(grn_ctx *ctx,
                                        grn_tokenizer_query *query,
                                        uint32_t flags);
GRN_PLUGIN_EXPORT uint32_t
grn_tokenizer_query_get_normalize_flags(grn_ctx *ctx,
                                        grn_tokenizer_query *query);

GRN_PLUGIN_EXPORT grn_obj *
grn_tokenizer_query_get_normalized_string(grn_ctx *ctx,
                                          grn_tokenizer_query *query);

GRN_PLUGIN_EXPORT const char *
grn_tokenizer_query_get_raw_string(grn_ctx *ctx,
                                   grn_tokenizer_query *query,
                                   size_t *length);

GRN_PLUGIN_EXPORT const char *
grn_tokenizer_query_get_data(grn_ctx *ctx,
                             grn_tokenizer_query *query,
                             size_t *size,
                             grn_id *domain);

GRN_PLUGIN_EXPORT grn_encoding
grn_tokenizer_query_get_encoding(grn_ctx *ctx, grn_tokenizer_query *query);

GRN_PLUGIN_EXPORT uint32_t
grn_tokenizer_query_get_flags(grn_ctx *ctx, grn_tokenizer_query *query);

GRN_PLUGIN_EXPORT grn_bool
grn_tokenizer_query_have_tokenized_delimiter(grn_ctx *ctx,
                                             grn_tokenizer_query *query);

GRN_PLUGIN_EXPORT grn_tokenize_mode
grn_tokenizer_query_get_mode(grn_ctx *ctx, grn_tokenizer_query *query);

GRN_PLUGIN_EXPORT grn_obj *
grn_tokenizer_query_get_lexicon(grn_ctx *ctx, grn_tokenizer_query *query);

GRN_PLUGIN_EXPORT unsigned int
grn_tokenizer_query_get_token_filter_index(grn_ctx *ctx,
                                           grn_tokenizer_query *query);

GRN_PLUGIN_EXPORT grn_obj *
grn_tokenizer_query_get_source_column(grn_ctx *ctx, grn_tokenizer_query *query);

GRN_PLUGIN_EXPORT grn_id
grn_tokenizer_query_get_source_id(grn_ctx *ctx, grn_tokenizer_query *query);

GRN_PLUGIN_EXPORT grn_obj *
grn_tokenizer_query_get_index_column(grn_ctx *ctx, grn_tokenizer_query *query);
GRN_PLUGIN_EXPORT grn_obj *
grn_tokenizer_query_get_options(grn_ctx *ctx, grn_tokenizer_query *query);

/*
  grn_tokenizer_token is needed to return tokens. A grn_tokenizer_token object
  stores a token to be returned and it must be maintained until a request for
  next token or finalization comes.
 */
typedef struct _grn_tokenizer_token grn_tokenizer_token;

struct _grn_tokenizer_token {
  grn_obj str;
  grn_obj status;
};

/*
  grn_tokenizer_token_init() initializes `token'. Note that an initialized
  object must be finalized by grn_tokenizer_token_fin().
 */
GRN_PLUGIN_EXPORT void
grn_tokenizer_token_init(grn_ctx *ctx, grn_tokenizer_token *token);

/*
  grn_tokenizer_token_fin() finalizes `token' that has been initialized by
  grn_tokenizer_token_init().
 */
GRN_PLUGIN_EXPORT void
grn_tokenizer_token_fin(grn_ctx *ctx, grn_tokenizer_token *token);

/*
 * grn_tokenizer_status is a flag set for tokenizer status codes.
 * If a document or query contains no tokens, push an empty string with
 * GRN_TOKENIZER_TOKEN_LAST as a token.
 *
 * @deprecated since 4.0.8. Use grn_token_status instead.
 */
typedef grn_token_status grn_tokenizer_status;

/*
 * GRN_TOKENIZER_TOKEN_CONTINUE means that the next token is not the last one.
 *
 * @deprecated since 4.0.8. Use GRN_TOKEN_CONTINUE instead.
 */
#define GRN_TOKENIZER_TOKEN_CONTINUE GRN_TOKEN_CONTINUE
/*
 * GRN_TOKENIZER_TOKEN_LAST means that the next token is the last one.
 *
 * @deprecated since 4.0.8. Use GRN_TOKEN_LAST instead.
 */
#define GRN_TOKENIZER_TOKEN_LAST GRN_TOKEN_LAST
/*
 * GRN_TOKENIZER_TOKEN_OVERLAP means that ...
 *
 * @deprecated since 4.0.8. Use GRN_TOKEN_OVERLAP instead.
 */
#define GRN_TOKENIZER_TOKEN_OVERLAP GRN_TOKEN_OVERLAP
/*
 * GRN_TOKENIZER_TOKEN_UNMATURED means that ...
 *
 * @deprecated since 4.0.8. Use GRN_TOKEN_UNMATURED instead.
 */
#define GRN_TOKENIZER_TOKEN_UNMATURED GRN_TOKEN_UNMATURED
/*
 * GRN_TOKENIZER_TOKEN_REACH_END means that ...
 *
 * @deprecated since 4.0.8. Use GRN_TOKEN_REACH_END instead.
 */
#define GRN_TOKENIZER_TOKEN_REACH_END GRN_TOKEN_REACH_END
/*
 * GRN_TOKENIZER_TOKEN_SKIP means that the token is skipped
 *
 * @deprecated since 4.0.8. Use GRN_TOKEN_SKIP instead.
 */
#define GRN_TOKENIZER_TOKEN_SKIP GRN_TOKEN_SKIP
/*
 * GRN_TOKENIZER_TOKEN_SKIP_WITH_POSITION means that the token and postion is
 * skipped
 *
 * @deprecated since 4.0.8. Use GRN_TOKEN_SKIP_WITH_POSITION instead.
 */
#define GRN_TOKENIZER_TOKEN_SKIP_WITH_POSITION GRN_TOKEN_SKIP_WITH_POSITION
/*
 * GRN_TOKENIZER_TOKEN_FORCE_PREIX that the token is used common prefix search
 *
 * @deprecated since 4.0.8. Use GRN_TOKEN_FORCE_PREIX instead.
 */
#define GRN_TOKENIZER_TOKEN_FORCE_PREFIX GRN_TOKEN_FORCE_PREFIX

/*
 * GRN_TOKENIZER_CONTINUE and GRN_TOKENIZER_LAST are deprecated. They
 * are just for backward compatibility. Use
 * GRN_TOKENIZER_TOKEN_CONTINUE and GRN_TOKENIZER_TOKEN_LAST
 * instead.
 */
#define GRN_TOKENIZER_CONTINUE GRN_TOKENIZER_TOKEN_CONTINUE
#define GRN_TOKENIZER_LAST     GRN_TOKENIZER_TOKEN_LAST

/*
  grn_tokenizer_token_push() pushes the next token into `token'. Note that
  grn_tokenizer_token_push() does not make a copy of the given string. This
  means that you have to maintain a memory space allocated to the string.
  Also note that the grn_tokenizer_token object must be maintained until the
  request for the next token or finalization comes. See grn_token_status in
  this header for more details of `status'.
 */
GRN_PLUGIN_EXPORT void
grn_tokenizer_token_push(grn_ctx *ctx,
                         grn_tokenizer_token *token,
                         const char *str_ptr,
                         unsigned int str_length,
                         grn_token_status status);

/*
  grn_tokenizer_tokenized_delimiter_next() extracts the next token
  from the string specified by `str_ptr' and `str_length' and pushes
  the next token into `token'. It returns the string after the next
  token. The returned string may be `NULL' when all tokens are
  extracted.

  @deprecated since 8.0.9. It's for old tokenizer next API. Use
  grn_tokenizer_next_by_tokenized_delimiter() for new tokenizer next
  API (grn_tokenizer_next_func).
 */
GRN_PLUGIN_EXPORT const char *
grn_tokenizer_tokenized_delimiter_next(grn_ctx *ctx,
                                       grn_tokenizer_token *token,
                                       const char *str_ptr,
                                       unsigned int str_length,
                                       grn_encoding encoding);

/*
  Extract the next token by delimiting by
  GRN_TOKENIZER_TOKENIZED_DELIMITER_UTF8.

  This is for grn_tokenizer_next_func.

  @since 8.0.9.
 */
GRN_PLUGIN_EXPORT const char *
grn_tokenizer_next_by_tokenized_delimiter(grn_ctx *ctx,
                                          grn_token *token,
                                          const char *str_ptr,
                                          unsigned int str_length,
                                          grn_encoding encoding);

/*
  grn_tokenizer_register() registers a plugin to the database which is
  associated with `ctx'. `plugin_name_ptr' and `plugin_name_length' specify the
  plugin name. Alphabetic letters ('A'-'Z' and 'a'-'z'), digits ('0'-'9') and
  an underscore ('_') are capable characters. `init', `next' and `fin' specify
  the plugin functions. `init' is called for initializing a tokenizer for a
  document or query. `next' is called for extracting tokens one by one. `fin'
  is called for finalizing a tokenizer. grn_tokenizer_register() returns
  GRN_SUCCESS on success, an error code on failure. See "groonga.h" for more
  details of grn_proc_func and grn_user_data, that is used as an argument of
  grn_proc_func.

  @deprecated since 8.0.2. Use grn_tokenizer_create() and
  grn_tokenizer_set_*_func().
 */
GRN_PLUGIN_EXPORT grn_rc
grn_tokenizer_register(grn_ctx *ctx,
                       const char *plugin_name_ptr,
                       unsigned int plugin_name_length,
                       grn_proc_func *init,
                       grn_proc_func *next,
                       grn_proc_func *fin);

GRN_PLUGIN_EXPORT grn_obj *
grn_tokenizer_create(grn_ctx *ctx, const char *name, int name_length);

typedef void *
grn_tokenizer_init_func(grn_ctx *ctx, grn_tokenizer_query *query);
typedef void
grn_tokenizer_next_func(grn_ctx *ctx,
                        grn_tokenizer_query *query,
                        grn_token *token,
                        void *user_data);
typedef void
grn_tokenizer_fin_func(grn_ctx *ctx, void *user_data);

GRN_PLUGIN_EXPORT grn_rc
grn_tokenizer_set_init_func(grn_ctx *ctx,
                            grn_obj *tokenizer,
                            grn_tokenizer_init_func *init);
GRN_PLUGIN_EXPORT grn_rc
grn_tokenizer_set_next_func(grn_ctx *ctx,
                            grn_obj *tokenizer,
                            grn_tokenizer_next_func *next);
GRN_PLUGIN_EXPORT grn_rc
grn_tokenizer_set_fin_func(grn_ctx *ctx,
                           grn_obj *tokenizer,
                           grn_tokenizer_fin_func *fin);

#ifdef __cplusplus
} /* extern "C" */
#endif /* __cplusplus */
