1 files changed, 168 insertions, 0 deletions
diff --git a/src/Components/Key.php b/src/Components/Key.php
new file mode 100644
index 0000000..a79feef
--- /dev/null
+++ b/src/Components/Key.php
@@ -0,0 +1,168 @@
+<?php
+
+/**
+ * Parses the definition of a key.
+ *
+ * @package    SqlParser
+ * @subpackage Components
+ */
+namespace SqlParser\Components;
+
+use SqlParser\Context;
+use SqlParser\Component;
+use SqlParser\Parser;
+use SqlParser\Token;
+use SqlParser\TokensList;
+
+/**
+ * Parses the definition of a key.
+ *
+ * Used for parsing `CREATE TABLE` statement.
+ *
+ * @category   Components
+ * @package    SqlParser
+ * @subpackage Components
+ * @author     Dan Ungureanu <udan1107@gmail.com>
+ * @license    http://opensource.org/licenses/GPL-2.0 GNU Public License
+ */
+class Key extends Component
+{
+
+    /**
+     * All key options.
+     *
+     * @var array
+     */
+    public static $KEY_OPTIONS = array(
+        'KEY_BLOCK_SIZE'                => array(1, 'var'),
+        'USING'                         => array(2, 'var'),
+        'WITH PARSER'                   => array(3, 'var'),
+    );
+
+    /**
+     * The name of this key.
+     *
+     * @var string
+     */
+    public $name;
+
+    /**
+     * Columns.
+     *
+     * @var array
+     */
+    public $columns;
+
+    /**
+     * The type of this key.
+     *
+     * @var string
+     */
+    public $type;
+
+    /**
+     * The options of this key.
+     *
+     * @var OptionsArray
+     */
+    public $options;
+
+    /**
+     * Constructor.
+     *
+     * @param string          $name    The name of the key.
+     * @param array           $columns The columns covered by this key.
+     * @param string          $type    The type of this key.
+     * @param OptionsArray $options The options of this key.
+     */
+    public function __construct($name = null, array $columns = array(),
+        $type = null, $options = null
+    ) {
+        $this->name = $name;
+        $this->columns = $columns;
+        $this->type = $type;
+        $this->options = $options;
+    }
+
+    /**
+     * @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 Key[]
+     */
+    public static function parse(Parser $parser, TokensList $list, array $options = array())
+    {
+        $ret = new Key();
+
+        /**
+         * The state of the parser.
+         *
+         * Below are the states of the parser.
+         *
+         *      0 ----------------------[ type ]-----------------------> 1
+         *
+         *      1 ----------------------[ name ]-----------------------> 1
+         *      1 ---------------------[ columns ]---------------------> 2
+         *
+         *      2 ---------------------[ options ]---------------------> 3
+         *
+         * @var int
+         */
+        $state = 0;
+
+        for (; $list->idx < $list->count; ++$list->idx) {
+            /**
+             * Token parsed at this moment.
+             * @var Token $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) {
+                $ret->type = $token->value;
+                $state = 1;
+            } elseif ($state === 1) {
+                if (($token->type === Token::TYPE_OPERATOR) && ($token->value === '(')) {
+                    $ret->columns = ArrayObj::parse($parser, $list)->values;
+                    $state = 2;
+                } else {
+                    $ret->name = $token->value;
+                }
+            } elseif ($state === 2) {
+                $ret->options = OptionsArray::parse($parser, $list, static::$KEY_OPTIONS);
+                ++$list->idx;
+                break;
+            }
+
+        }
+
+        --$list->idx;
+        return $ret;
+    }
+
+    /**
+     * @param Key $component The component to be built.
+     *
+     * @return string
+     */
+    public static function build($component)
+    {
+        $ret = $component->type . ' ';
+        if (!empty($component->name)) {
+            $ret .= Context::escape($component->name) . ' ';
+        }
+        $ret .= '(' . implode(', ', Context::escape($component->columns)) . ')';
+        $ret .= OptionsArray::build($component->options);
+        return trim($ret);
+    }
+}