first version

tools/parser_sql/processors/DropProcessor.php

@@ -0,0 +1,108 @@
+<?php
+/**
+ * DropProcessor.php
+ *
+ * This file implements the processor for the DROP 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.
+ */
+
+require_once(dirname(__FILE__) . '/../utils/ExpressionToken.php');
+require_once(dirname(__FILE__) . '/../utils/ExpressionType.php');
+require_once(dirname(__FILE__) . '/AbstractProcessor.php');
+
+/**
+ * 
+ * This class processes the DROP statements.
+ * 
+ * @author arothe
+ * 
+ */
+class DropProcessor extends AbstractProcessor {
+
+    // TODO: we should enhance it to get the positions for the IF EXISTS keywords
+    // look into the CreateProcessor to get an idea.
+    public function process($tokenList) {
+        $skip = 0;
+        $warning = true;
+        $base_expr = "";
+        $expr_type = false;
+        $option = false;
+        $resultList = array();
+
+        foreach ($tokenList as $k => $v) {
+            $token = new ExpressionToken($k, $v);
+
+            if ($token->isWhitespaceToken()) {
+                continue;
+            }
+
+            if ($skip > 0) {
+                $skip --;
+                continue;
+            }
+
+            switch ($token->getUpper()) {
+            case 'VIEW':
+            case 'SCHEMA':
+            case 'DATABASE':
+            case 'TABLE':
+                $expr_type = strtolower($token->getTrim());
+                break;
+
+            case 'IF':
+                $warning = false;
+                $skip = 1;
+                break;
+
+            case 'TEMPORARY':
+                $expr_type = ExpressionType::TEMPORARY_TABLE;
+                $skip = 1;
+                break;
+
+            case 'RESTRICT':
+            case 'CASCADE':
+                $option = $token->getUpper();
+                break;
+
+            case ',':
+                $resultList[] = array('expr_type' => $expr_type, 'base_expr' => $base_expr);
+                $base_expr = "";
+                break;
+
+            default:
+                $base_expr .= $token->getToken();
+            }
+        }
+
+        if ($base_expr !== "") {
+            $resultList[] = array('expr_type' => $expr_type, 'base_expr' => $base_expr);
+        }
+
+        return array('option' => $option, 'warning' => $warning, 'object_list' => $resultList);
+    }
+}
+?>