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tools/parser_sql/processors/IndexColumnListProcessor.php

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+<?php
+/**
+ * IndexColumnListProcessor.php
+ *
+ * This file implements the processor for index column lists.
+ *
+ * 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__) . '/AbstractProcessor.php');
+require_once(dirname(__FILE__) . '/../utils/ExpressionType.php');
+
+/**
+ * 
+ * This class processes the index column lists.
+ * 
+ * @author arothe
+ * 
+ */
+class IndexColumnListProcessor extends AbstractProcessor {
+
+    protected function initExpression() {
+        return array('name' => false, 'no_quotes' => false, 'length' => false, 'dir' => false);
+    }
+
+    public function process($sql) {
+        $tokens = $this->splitSQLIntoTokens($sql);
+
+        $expr = $this->initExpression();
+        $result = array();
+        $base_expr = "";
+
+        foreach ($tokens as $k => $token) {
+
+            $trim = trim($token);
+            $base_expr .= $token;
+
+            if ($trim === "") {
+                continue;
+            }
+
+            $upper = strtoupper($trim);
+
+            switch ($upper) {
+
+            case 'ASC':
+            case 'DESC':
+            # the optional order
+                $expr['dir'] = $trim;
+                break;
+
+            case ',':
+            # the next column
+                $result[] = array_merge(array('expr_type' => ExpressionType::INDEX_COLUMN, 'base_expr' => $base_expr),
+                        $expr);
+                $expr = $this->initExpression();
+                $base_expr = "";
+                break;
+
+            default:
+                if ($upper[0] === '(' && substr($upper, -1) === ')') {
+                    # the optional length
+                    $expr['length'] = $this->removeParenthesisFromStart($trim);
+                    continue 2;
+                }
+                # the col name
+                $expr['name'] = $trim;
+                $expr['no_quotes'] = $this->revokeQuotation($trim);
+                break;
+            }
+        }
+        $result[] = array_merge(array('expr_type' => ExpressionType::INDEX_COLUMN, 'base_expr' => $base_expr), $expr);
+        return $result;
+    }
+}
+?>