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/*
 * Copyright 2008 Search Solution Corporation
 * Copyright 2016 CUBRID Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */


/*
 * shard_parser.h -
 */

#ifndef _SHARD_PARSER_H_
#define _SHARD_PARSER_H_

#ident "$Id$"


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "system.h"
#include "error_code.h"

#define SP_VALUE_INIT_SIZE 50
#define SHARD_KEY_LENGTH 128

enum sp_error_code
{
  ER_SP_OUT_OF_MEMORY = -1,
  ER_SP_NOT_FOUND_HINT = -2,
  ER_SP_INVALID_HINT = -3,
  ER_SP_INVALID_SYNTAX = -4,
  ER_SP_DUPLICATED_HINT = -5
};

enum sp_hint_type
{
  HT_INVAL = -1,
  HT_NONE,
  HT_KEY,
  HT_VAL,
  HT_ALL,
  HT_ID,
  HT_EOF
};
typedef enum sp_hint_type SP_HINT_TYPE;

enum sp_bind_type
{
  BT_STATIC,
  BT_DYNAMIC
};
typedef enum sp_bind_type SP_BIND_TYPE;

enum sp_value_type
{
  VT_INTEGER,           /* this type means INT64 to support 64bit integer key value */
  VT_STRING
};
typedef enum sp_value_type SP_VALUE_TYPE;

enum sp_token
{
  TT_NONE,
  TT_SINGLE_QUOTED,
  TT_DOUBLE_QUOTED,
  TT_CSQL_COMMENT,
  TT_CPP_COMMENT,
  TT_WHITESPACE,
  TT_NEWLINE,
  TT_C_COMMENT,
  TT_C_COMMENT_END,
  TT_HINT,
  TT_SHARD_HINT,
  TT_ASSIGN_OP,
  TT_IN_OP,
  TT_LEFT_BRAKET,
  TT_RIGHT_BRAKET,
  TT_BIND_CHAR
};
typedef enum sp_token SP_TOKEN;

typedef struct sp_cursor SP_CURSOR;
struct sp_cursor
{
  const char *pos;
  SP_TOKEN token;
};

typedef struct sp_value SP_VALUE;
struct sp_value
{
  SP_VALUE_TYPE type;
  struct
  {
    int length;
    char *value;
    char value_arr[SP_VALUE_INIT_SIZE];
    char *value_ex;
  } string;
  INT64 integer;
};

typedef struct sp_parser_hint SP_PARSER_HINT;
struct sp_parser_hint
{
  SP_PARSER_HINT *next_a;
  SP_PARSER_HINT *next_t[2];
  SP_HINT_TYPE hint_type;
  SP_BIND_TYPE bind_type;
  int bind_position;
  SP_VALUE arg;
  SP_VALUE value;
};

typedef struct sp_parser_hint_list SP_PARSER_HINT_LIST;
struct sp_parser_hint_list
{
  SP_PARSER_HINT *head;
  SP_PARSER_HINT *tail;
  int size;
};

typedef struct sp_parser_ctx SP_PARSER_CTX;
struct sp_parser_ctx
{
  char *sql_stmt;
  bool is_select;
  int bind_count;
  SP_CURSOR cursor;
  SP_CURSOR prv_cursor;
  SP_TOKEN operator_;
  SP_PARSER_HINT_LIST list_a;
  SP_PARSER_HINT_LIST list_t[2];
};

extern SP_PARSER_CTX *sp_create_parser (const char *sql_stmt);
extern int sp_parse_sql (SP_PARSER_CTX * parser_p);
extern void sp_destroy_parser (SP_PARSER_CTX * parser_p);
extern bool sp_is_hint_static (SP_PARSER_CTX * parser_p);
extern int sp_get_total_hint_count (SP_PARSER_CTX * parser_p);
extern int sp_get_static_hint_count (SP_PARSER_CTX * parser_p);
extern int sp_get_dynamic_hint_count (SP_PARSER_CTX * parser_p);
extern SP_PARSER_HINT *sp_get_first_hint (SP_PARSER_CTX * parser_p);
extern SP_PARSER_HINT *sp_get_next_hint (SP_PARSER_HINT * hint_p);
extern SP_PARSER_HINT *sp_get_first_static_hint (SP_PARSER_CTX * parser_p);
extern SP_PARSER_HINT *sp_get_next_static_hint (SP_PARSER_HINT * hint_p);
extern SP_PARSER_HINT *sp_get_first_dynamic_hint (SP_PARSER_CTX * parser_p);
extern SP_PARSER_HINT *sp_get_next_dynamic_hint (SP_PARSER_HINT * hint_p);
extern char *sp_get_hint_key (SP_PARSER_HINT * hint_p);
extern const char *sp_get_sql_stmt (SP_PARSER_CTX * parser_p);
extern const char *sp_get_token_type (const char *sql, SP_TOKEN * token);
extern bool sp_is_pair_token (SP_TOKEN start_token, SP_TOKEN end_token);
extern bool sp_is_exist_pair_token (SP_TOKEN token);
extern SP_PARSER_HINT *sp_create_parser_hint (void);
extern void sp_free_parser_hint (SP_PARSER_HINT * hint_p);
extern const char *sp_get_hint_type (const char *sql, SP_HINT_TYPE * hint_type);
extern const char *sp_get_hint_arg (const char *sql, SP_PARSER_HINT * hint_p, int *error);
extern const char *sp_check_end_of_hint (const char *sql, int *error);

#endif