Add GroupKeyword class to fix postgres GROUP BY

Author: JoseNetoooo

src/Components/GroupKeyword.php

@@ -0,0 +1,141 @@
+<?php
+
+/**
+ * `GROUP BY` keyword parser.
+ */
+
+namespace PhpMyAdmin\SqlParser\Components;
+
+use PhpMyAdmin\SqlParser\Component;
+use PhpMyAdmin\SqlParser\Parser;
+use PhpMyAdmin\SqlParser\Token;
+use PhpMyAdmin\SqlParser\TokensList;
+
+/**
+ * `GROUP BY` keyword parser.
+ *
+ * @category   Keywords
+ *
+ * @license    https://www.gnu.org/licenses/gpl-2.0.txt GPL-2.0+
+ */
+class GroupKeyword extends Component
+{
+    /**
+     * The expression that is used for ordering.
+     *
+     * @var Expression
+     */
+    public $expr;
+    
+    /**
+     * The order type.
+     *
+     * @var string
+     */
+    public $type;
+
+    /**
+     * Constructor.
+     *
+     * @param Expression $expr the expression that we are sorting by
+     * @param string     $type the sorting type
+     */
+    public function __construct($expr = null, $type = '')
+    {
+        $this->expr = $expr;
+        $this->type = $type;
+    }
+
+    /**
+     * @param Parser     $parser  the parser that serves as context
+     * @param TokensList $list    the list of tokens that are being parsed
+     * @param array      $options parameters for parsing
+     *
+     * @return GroupKeyword[]
+     */
+    public static function parse(Parser $parser, TokensList $list, array $options = array())
+    {
+        $ret = array();
+
+        $expr = new self();
+
+        /**
+         * The state of the parser.
+         *
+         * Below are the states of the parser.
+         *
+         *      0 --------------------[ expression ]-------------------> 1
+         *
+         *      1 ------------------------[ , ]------------------------> 0
+         *      1 -------------------[ ASC / DESC ]--------------------> 1
+         *
+         * @var int
+         */
+        $state = 0;
+
+        for (; $list->idx < $list->count; ++$list->idx) {
+            /**
+             * Token parsed at this moment.
+             *
+             * @var Token
+             */
+            $token = $list->tokens[$list->idx];
+
+            // End of statement.
+            if ($token->type === Token::TYPE_DELIMITER) {
+                break;
+            }
+
+            // Skipping whitespaces and comments.
+            if (($token->type === Token::TYPE_WHITESPACE) || ($token->type === Token::TYPE_COMMENT)) {
+                continue;
+            }
+
+            if ($state === 0) {
+                $expr->expr = Expression::parse($parser, $list);
+                $state = 1;
+            } elseif ($state === 1) {
+                if (($token->type === Token::TYPE_KEYWORD)
+                    && (($token->keyword === 'ASC') || ($token->keyword === 'DESC'))
+                ) {
+                    $expr->type = $token->keyword;
+                } elseif (($token->type === Token::TYPE_OPERATOR)
+                    && ($token->value === ',')
+                ) {
+                    if (!empty($expr->expr)) {
+                        $ret[] = $expr;
+                    }
+                    $expr = new self();
+                    $state = 0;
+                } else {
+                    break;
+                }
+            }
+        }
+
+        // Last iteration was not processed.
+        if (!empty($expr->expr)) {
+            $ret[] = $expr;
+        }
+
+        --$list->idx;
+
+        return $ret;
+    }
+
+    /**
+     * @param GroupKeyword|GroupKeyword[] $component the component to be built
+     * @param array                       $options   parameters for building
+     *
+     * @return string
+     */
+    public static function build($component, array $options = array())
+    {
+        if (is_array($component)) {
+            return implode(', ', $component);
+        }
+
+        return trim($component->expr . ' ' . $component->type);
+
+    }
+}

src/Parser.php

@@ -168,7 +168,7 @@ class Parser extends Core
             'options' => array('field' => 'table'),
         ),
         'GROUP BY' => array(
-            'class' => 'PhpMyAdmin\\SqlParser\\Components\\OrderKeyword',
+            'class' => 'PhpMyAdmin\\SqlParser\\Components\\GroupKeyword',
             'field' => 'group',
         ),
         'HAVING' => array(

tests/Components/GroupKeywordTest.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace PhpMyAdmin\SqlParser\Tests\Components;
+
+use PhpMyAdmin\SqlParser\Components\Expression;
+use PhpMyAdmin\SqlParser\Components\GroupKeyword;
+use PhpMyAdmin\SqlParser\Tests\TestCase;
+
+class GroupKeywordTest extends TestCase
+{
+    public function testBuild()
+    {
+        $this->assertEquals(
+            GroupKeyword::build(
+                array(
+                    new GroupKeyword(new Expression('a'), 'ASC'),
+                    new GroupKeyword(new Expression('b'), 'DESC'),
+                    new GroupKeyword(new Expression('c')),
+                )
+            ),
+            'a ASC, b DESC, c'
+        );
+    }
+}