<?php

/**
 * ShowProcessor.php
 *
 * This file implements the processor for the SHOW statements.
 *
 * Copyright (c) 2010-2012, Justin Swanhart
 * with contributions by André Rothe <arothe@phosco.info, phosco@gmx.de>
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 *   * Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */
namespace WPDT\PHPSQLParser\processors;

use WPDT\PHPSQLParser\Options;
use WPDT\PHPSQLParser\utils\ExpressionType;
use WPDT\PHPSQLParser\utils\PHPSQLParserConstants;
/**
 *
 * This class processes the SHOW statements.
 *
 * @author arothe
 *
 */
class ShowProcessor extends AbstractProcessor
{
    private $limitProcessor;
    public function __construct(Options $options)
    {
        parent::__construct($options);
        $this->limitProcessor = new LimitProcessor($options);
    }
    public function process($tokens)
    {
        $resultList = array();
        $category = "";
        $prev = "";
        foreach ($tokens as $k => $token) {
            $upper = \strtoupper(\trim($token));
            if ($this->isWhitespaceToken($token)) {
                continue;
            }
            switch ($upper) {
                case 'FROM':
                    $resultList[] = array('expr_type' => ExpressionType::RESERVED, 'base_expr' => \trim($token));
                    if ($prev === 'INDEX' || $prev === 'COLUMNS') {
                        break;
                    }
                    $category = $upper;
                    break;
                case 'CREATE':
                case 'DATABASE':
                case 'SCHEMA':
                case 'FUNCTION':
                case 'PROCEDURE':
                case 'ENGINE':
                case 'TABLE':
                case 'FOR':
                case 'LIKE':
                case 'INDEX':
                case 'COLUMNS':
                case 'PLUGIN':
                case 'PRIVILEGES':
                case 'PROCESSLIST':
                case 'LOGS':
                case 'STATUS':
                case 'GLOBAL':
                case 'SESSION':
                case 'FULL':
                case 'GRANTS':
                case 'INNODB':
                case 'STORAGE':
                case 'ENGINES':
                case 'OPEN':
                case 'BDB':
                case 'TRIGGERS':
                case 'VARIABLES':
                case 'DATABASES':
                case 'SCHEMAS':
                case 'ERRORS':
                case 'TABLES':
                case 'WARNINGS':
                case 'CHARACTER':
                case 'SET':
                case 'COLLATION':
                    $resultList[] = array('expr_type' => ExpressionType::RESERVED, 'base_expr' => \trim($token));
                    $category = $upper;
                    break;
                default:
                    switch ($prev) {
                        case 'LIKE':
                            $resultList[] = array('expr_type' => ExpressionType::CONSTANT, 'base_expr' => $token);
                            break;
                        case 'LIMIT':
                            $limit = \array_pop($resultList);
                            $limit['sub_tree'] = $this->limitProcessor->process(\array_slice($tokens, $k));
                            $resultList[] = $limit;
                            break;
                        case 'FROM':
                        case 'SCHEMA':
                        case 'DATABASE':
                            $resultList[] = array('expr_type' => ExpressionType::DATABASE, 'name' => $token, 'no_quotes' => $this->revokeQuotation($token), 'base_expr' => $token);
                            break;
                        case 'FOR':
                            $resultList[] = array('expr_type' => ExpressionType::USER, 'name' => $token, 'no_quotes' => $this->revokeQuotation($token), 'base_expr' => $token);
                            break;
                        case 'INDEX':
                        case 'COLUMNS':
                        case 'TABLE':
                            $resultList[] = array('expr_type' => ExpressionType::TABLE, 'table' => $token, 'no_quotes' => $this->revokeQuotation($token), 'base_expr' => $token);
                            $category = "TABLENAME";
                            break;
                        case 'FUNCTION':
                            if (PHPSQLParserConstants::getInstance()->isAggregateFunction($upper)) {
                                $expr_type = ExpressionType::AGGREGATE_FUNCTION;
                            } else {
                                $expr_type = ExpressionType::SIMPLE_FUNCTION;
                            }
                            $resultList[] = array('expr_type' => $expr_type, 'name' => $token, 'no_quotes' => $this->revokeQuotation($token), 'base_expr' => $token);
                            break;
                        case 'PROCEDURE':
                            $resultList[] = array('expr_type' => ExpressionType::PROCEDURE, 'name' => $token, 'no_quotes' => $this->revokeQuotation($token), 'base_expr' => $token);
                            break;
                        case 'ENGINE':
                            $resultList[] = array('expr_type' => ExpressionType::ENGINE, 'name' => $token, 'no_quotes' => $this->revokeQuotation($token), 'base_expr' => $token);
                            break;
                        default:
                            // ignore
                            break;
                    }
                    break;
            }
            $prev = $category;
        }
        return $resultList;
    }
}
