modules/platforms/cpp/odbc/include/ignite/odbc/sql/sql_token.h

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

#ifndef _IGNITE_ODBC_SQL_SQL_TOKEN
#define _IGNITE_ODBC_SQL_SQL_TOKEN

#include <stdint.h>

#include <ignite/common/utils.h>

namespace ignite
{
    namespace odbc
    {
        /**
         * Token type.
         */
        struct TokenType
        {
            enum Type
            {
                /** Minus token. */
                MINUS,

                /** Quoted token. */
                QUOTED,

                /** String literal token. */
                STRING,

                /** Dot. */
                DOT,

                /** Comma. */
                COMMA,

                /** Parenthesis: left. */
                PARENTHESIS_LEFT,

                /** Parenthesis: right. */
                PARENTHESIS_RIGHT,

                /** Semicolon. */
                SEMICOLON,

                /** Simple word. */
                WORD,

                /** End of data. */
                EOD
            };
        };

        /**
         * SQL token.
         */
        class SqlToken
        {
        public:
            /**
             * Constructor.
             *
             * @param token Token begin pointer.
             * @param size Token size in characters.
             * @param typ Token type.
             */
            SqlToken(const char* token, int32_t size, TokenType::Type typ) :
                token(token),
                size(size),
                typ(typ)
            {
                // No-op.
            }

            /**
             * Get type.
             *
             * @return Current token type.
             */
            TokenType::Type GetType() const
            {
                return typ;
            }

            /**
             * Get token value.
             *
             * @return Pointer to the beginning of the value. Size of the value can be obtained with @c GetSize().
             */
            const char* GetValue() const
            {
                return token;
            }

            /**
             * Get size.
             *
             * @return Size.
             */
            int32_t GetSize() const
            {
                return size;
            }

            /**
             * Convert to string.
             *
             * @return String token.
             */
            std::string ToString() const
            {
                if (!token || size <= 0)
                    return std::string();

                return std::string(token, static_cast<size_t>(size));
            }

            /**
             * Convert to lowercase string.
             *
             * @return Lowercase string token.
             */
            std::string ToLower() const
            {
                std::string str(ToString());

                common::IntoLower(str);

                return str;
            }

        private:
            /** Current token begin. */
            const char* token;

            /** Current token size. */
            int32_t size;

            /** Current token type. */
            TokenType::Type typ;
        };
    }
}

#endif //_IGNITE_ODBC_SQL_SQL_TOKEN