Add parsing of multiple JOINS in single query

Signed-off-by: Deven Bansod <devenbansod.bits@gmail.com>

Author: devenbansod

src/Components/JoinKeyword.php

@@ -154,8 +154,17 @@ public static function parse(Parser $parser, TokensList $list, array $options =
                     } elseif ($token->value === 'USING') {
                         $state = 4;
                     } else {
-                        /* Next clause is starting */
-                        break;
+                        if (($token->type === Token::TYPE_KEYWORD)
+                            && (!empty(static::$JOINS[$token->value]))
+                        ) {
+                            $ret[] = $expr;
+                            $expr = new JoinKeyword();
+                            $expr->type = static::$JOINS[$token->value];
+                            $state = 1;
+                        } else {
+                            /* Next clause is starting */
+                            break;
+                        }
                     }
                 }
             } elseif ($state === 3) {

tests/data/parser/parseSelectJoinMultiple.in

@@ -0,0 +1,2 @@
+SELECT * FROM Orders NATURAL JOIN Items_Orders NATURAL JOIN Items
+WHERE customer= 'username'

tests/data/parser/parseSelectJoinMultiple.out

@@ -0,0 +1,4 @@
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