Merge pull request #204 from oohook/master

GroupByExpressionBuilder.php

Author: greenlion

src/PHPSQLParser/builders/GroupByExpressionBuilder.php

@@ -0,0 +1,89 @@
+<?php
+/**
+ * GroupByExpressionBuilder.php
+ *
+ * Builds an expression within a GROUP-BY clause.
+ *
+ * PHP version 5
+ *
+ * LICENSE:
+ * Copyright (c) 2010-2014 Justin Swanhart and André Rothe
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ * 
+ * @author    oohook <[email protected]>
+ * @copyright 2010-2016 Justin Swanhart and André Rothe
+ * @license   http://www.debian.org/misc/bsd.license  BSD License (3 Clause)
+ * @version   SVN: $Id$
+ * @example   group by id desc
+ * 
+ */
+
+namespace PHPSQLParser\builders;
+use PHPSQLParser\exceptions\UnableToCreateSQLException;
+use PHPSQLParser\utils\ExpressionType;
+
+/**
+ * This class implements the builder for an alias within the GROUP-BY clause. 
+ * You can overwrite all functions to achieve another handling.
+ *
+ * @author  oohook <[email protected]>
+ * @license http://www.debian.org/misc/bsd.license  BSD License (3 Clause)
+ *  
+ */
+class GroupByExpressionBuilder implements Builder {
+
+	protected function buildColRef($parsed) {
+		$builder = new ColumnReferenceBuilder();
+		return $builder->build($parsed);
+	}
+	
+	protected function buildReserved($parsed) {
+		$builder = new ReservedBuilder();
+		return $builder->build($parsed);
+	}
+	
+    public function build(array $parsed) {
+        if ($parsed['expr_type'] !== ExpressionType::EXPRESSION) {
+            return "";
+        }
+        
+        $sql = "";
+        foreach ($parsed['sub_tree'] as $k => $v) {
+            $len = strlen($sql);
+            $sql .= $this->buildColRef($v);
+            $sql .= $this->buildReserved($v);
+
+            if ($len == strlen($sql)) {
+                throw new UnableToCreateSQLException('GROUP expression subtree', $k, $v, 'expr_type');
+            }
+
+            $sql .= " ";
+        }
+
+        $sql = substr($sql, 0, -1);
+        return $sql;
+    }
+}
+?>