Added MariaDB's options for virtual fields. Updated contexts to contain relevant keywords.

Added magic method '__toString()' for components and statements for building.
Fixed a bug that caused the function name to be incorrectly detected in an expression.
Fixed a bug that ignored the 'noAlias' option in expressions.
Options may be expressions now.

16 files changed, 212 insertions, 61 deletions

diff --git a/src/Component.php b/src/Component.php
index 3505f3d..599784a 100644
--- a/src/Component.php
+++ b/src/Component.php
@@ -57,4 +57,15 @@ abstract class Component
         // abstract.
         return null;
     }
+
+    /**
+     * Builds the string representation of a component of this type.
+     *
+     * @see static::build
+     *
+     * @return string
+     */
+    public function __toString() {
+        return static::build($this);
+    }
 }
diff --git a/src/Components/Expression.php b/src/Components/Expression.php
index 29b5635..065810c 100644
--- a/src/Components/Expression.php
+++ b/src/Components/Expression.php
@@ -205,7 +205,7 @@ class Expression extends Component
                     // We don't check to see if `$prev` is `true` (open bracket
                     // was found before) because the brackets count is one (the
                     // only bracket we found is this one).
-                    if (($brackets === 1) && (empty($ret->function)) && ($prev !== null) && ($prev !== true)) {
+                    if ((empty($ret->function)) && ($prev !== null) && ($prev !== true)) {
                         // A function name was previously found and now an open
                         // bracket, so this is a function call.
                         $ret->function = $prev;
@@ -213,7 +213,15 @@ class Expression extends Component
                     $isExpr = true;
                 } elseif ($token->value === ')') {
                     --$brackets;
-                    if ($brackets < 0) {
+                    if ($brackets === 0) {
+                        if (!empty($options['bracketsDelimited'])) {
+                            // The current token is the last brackets, the next
+                            // one will be outside.
+                            $ret->expr .= $token->token;
+                            ++$list->idx;
+                            break;
+                        }
+                    } elseif ($brackets < 0) {
                         $parser->error('Unexpected bracket.', $token);
                         $brackets = 0;
                     }
@@ -268,11 +276,12 @@ class Expression extends Component
                 } else {
                     // Parsing aliases without `AS` keyword.
                     // Example: SELECT 'foo' `bar`
-                    if ($brackets === 0) {
+                    if (($brackets === 0) && (empty($options['noAlias']))) {
                         if (($token->type === Token::TYPE_NONE) || ($token->type === Token::TYPE_STRING)
                             || (($token->type === Token::TYPE_SYMBOL) && ($token->flags & Token::FLAG_SYMBOL_BACKTICK))
                         ) {
                             $ret->alias = $token->value;
+                            continue;
                         }
                     }
                 }
diff --git a/src/Components/FieldDefinition.php b/src/Components/FieldDefinition.php
index 0c3ea4f..22719eb 100644
--- a/src/Components/FieldDefinition.php
+++ b/src/Components/FieldDefinition.php
@@ -47,6 +47,12 @@ class FieldDefinition extends Component
         'COMMENT'                       => array(5, 'var'),
         'COLUMN_FORMAT'                 => array(6, 'var'),
         'ON UPDATE'                     => array(7, 'var'),
+
+        // MariaDB options.
+        'GENERATED ALWAYS'              => 1,
+        'AS'                            => array(2, 'expr', array('bracketsDelimited' => true)),
+        'VIRTUAL'                       => 3,
+        'PERSISTENT'                    => 3,
     );
 
     /**
diff --git a/src/Components/OptionsArray.php b/src/Components/OptionsArray.php
index d691e86..1bd68c5 100644
--- a/src/Components/OptionsArray.php
+++ b/src/Components/OptionsArray.php
@@ -72,8 +72,27 @@ class OptionsArray extends Component
          */
         $lastOptionId = 0;
 
+        /**
+         * Counts brackets.
+         * @var int $brackets
+         */
         $brackets = 0;
 
+        /**
+         * The state of the parser.
+         *
+         * Below are the states of the parser.
+         *
+         *      0 ---------------------[ option ]----------------------> 1
+         *
+         *      1 -------------------[ = (optional) ]------------------> 2
+         *
+         *      2 ----------------------[ value ]----------------------> 0
+         *
+         * @var int
+         */
+        $state = 0;
+
         for (; $list->idx < $list->count; ++$list->idx) {
             /**
              * Token parsed at this moment.
@@ -86,23 +105,36 @@ class OptionsArray extends Component
                 break;
             }
 
-            // Skipping whitespaces and comments.
-            if (($token->type === Token::TYPE_WHITESPACE) || ($token->type === Token::TYPE_COMMENT)) {
+            // Skipping comments.
+            if ($token->type === Token::TYPE_COMMENT) {
+                continue;
+            }
+
+            // Skipping whitespaces if not parsing value.
+            if (($token->type === Token::TYPE_WHITESPACE) && ($brackets === 0)) {
                 continue;
             }
 
             if ($lastOption === null) {
-                if (isset($options[strtoupper($token->token)])) {
-                    $lastOption = $options[strtoupper($token->token)];
-                    $lastOptionId = is_array($lastOption) ? $lastOption[0] : $lastOption;
+                $upper = strtoupper($token->token);
+                if (isset($options[$upper])) {
+                    $lastOption = $options[$upper];
+                    $lastOptionId = is_array($lastOption) ?
+                        $lastOption[0] : $lastOption;
+                    $state = 0;
 
                     // Checking for option conflicts.
-                    // For example, in `SELECT` statements the keywords `ALL` and `DISTINCT`
-                    // conflict and if used together, they produce an invalid query.
-                    // Usually, tokens can be identified in the array by the option ID,
-                    // but if conflicts occur, a generated option ID is used.
-                    // The first pseudo duplicate ID is the maximum value of the real
-                    // options (e.g.  if there are 5 options, the first fake ID is 6).
+                    // For example, in `SELECT` statements the keywords `ALL`
+                    // and `DISTINCT` conflict and if used together, they
+                    // produce an invalid query.
+                    //
+                    // Usually, tokens can be identified in the array by the
+                    // option ID, but if conflicts occur, a generated option ID
+                    // is used.
+                    //
+                    // The first pseudo duplicate ID is the maximum value of the
+                    // real options (e.g.  if there are 5 options, the first
+                    // fake ID is 6).
                     if (isset($ret->options[$lastOptionId])) {
                         $parser->error('This option conflicts with \'' . $ret->options[$lastOptionId] . '\'.', $token);
                         $lastOptionId = $lastAssignedId++;
@@ -113,33 +145,79 @@ class OptionsArray extends Component
                 }
             }
 
-            if (is_array($lastOption)) {
-                if (empty($ret->options[$lastOptionId])) {
+            if ($state === 0) {
+                if (!is_array($lastOption)) {
+                    // This is a just keyword option without any value.
+                    // This is the beginning and the end of it.
+                    $ret->options[$lastOptionId] = $token->value;
+                    $lastOption = null;
+                    $state = 0;
+                } elseif (($lastOption[1] === 'var') || ($lastOption[1] === 'var=')) {
+                    // This is a keyword that is followewd by a value.
+                    // This is only the beginning. The value is parsed in state
+                    // 1 and 2. State 1 is used to skip the first equals sign
+                    // and state 2 to parse the actual value.
                     $ret->options[$lastOptionId] = array(
+                        // @var The name of the option.
                         'name' => $token->value,
+                        // @var Whether it contains an equal sign.
+                        //      This is used by the builder to rebuild it.
                         'equal' => $lastOption[1] === 'var=',
+                        // @var Raw value.
                         'value' => '',
+                        // @var Processed value.
                         'value_' => '',
                     );
+                    $state = 1;
+                } elseif ($lastOption[1] === 'expr') {
+                    // This is a keyword that is followed by an expression.
+                    // The expression is used by the specialized parser.
+
+                    // Skipping this option in order to parse the expression.
+                    ++$list->idx;
+                    $ret->options[$lastOptionId] = array(
+                        'name' => $token->value,
+                        'value' => null,
+                    );
+                    $state = 1;
+                }
+            } elseif ($state === 1) {
+                $state = 2;
+                if ($token->value === '=') {
+                    $ret->options[$lastOptionId]['equal'] = true;
+                    continue;
+                }
+            }
+
+            // This is outside the `elseif` group above because the change might
+            // change this iteration.
+            if ($state === 2) {
+                if ($lastOption[1] === 'expr') {
+                    $ret->options[$lastOptionId]['value'] = Expression::parse(
+                        $parser,
+                        $list,
+                        empty($lastOption[2]) ? array() : $lastOption[2]
+                    );
+                    $lastOption = null;
+                    $state = 0;
                 } else {
-                    if ($token->value !== '=') {
-                        if ($token->value === '(') {
-                            ++$brackets;
-                        } elseif ($token->value === ')') {
-                            --$brackets;
-                        } else {
-                            // Raw and processed value.
-                            $ret->options[$lastOptionId]['value'] .= $token->token;
-                            $ret->options[$lastOptionId]['value_'] .= $token->value;
-                        }
-                        if ($brackets === 0) {
-                            $lastOption = null;
-                        }
+                    if ($token->token === '(') {
+                        ++$brackets;
+                    } elseif ($token->token === ')') {
+                        --$brackets;
+                    }
+
+                    // Raw value.
+                    $ret->options[$lastOptionId]['value'] .= $token->token;
+
+                    // Processed value.
+                    $ret->options[$lastOptionId]['value_'] .= $token->value;
+
+                    // Checking if we finished parsing.
+                    if ($brackets === 0) {
+                        $lastOption = null;
                     }
                 }
-            } else {
-                $ret->options[$lastOptionId] = $token->value;
-                $lastOption = null;
             }
         }
 
@@ -161,12 +239,14 @@ class OptionsArray extends Component
         }
         $options = array();
         foreach ($component->options as $option) {
-            if (is_array($option)) {
+            if (!is_array($option)) {
+                $options[] = $option;
+            } else {
                 $options[] = $option['name']
                     . (!empty($option['equal']) ? '=' : ' ')
-                    . $option['value'];
-            } else {
-                $options[] = $option;
+                    . ((string) $option['value']);
+                // If `$option['value']` happens to be a component, the magic
+                // method will build it automatically.
             }
         }
         return implode(' ', $options);
diff --git a/src/Contexts/ContextMySql50000.php b/src/Contexts/ContextMySql50000.php
index 48a928c..5069b91 100644
--- a/src/Contexts/ContextMySql50000.php
+++ b/src/Contexts/ContextMySql50000.php
@@ -63,7 +63,7 @@ class ContextMySql50000 extends Context
         'MIGRATE' => 1, 'PARTIAL' => 1, 'PREPARE' => 1, 'PROFILE' => 1, 'RECOVER' => 1,
         'RESTORE' => 1, 'RETURNS' => 1, 'ROUTINE' => 1, 'SESSION' => 1, 'STORAGE' => 1,
         'STRIPED' => 1, 'SUBJECT' => 1, 'SUSPEND' => 1, 'UNICODE' => 1, 'UNKNOWN' => 1,
-        'UPGRADE' => 1, 'USE_FRM' => 1,
+        'UPGRADE' => 1, 'USE_FRM' => 1, 'VIRTUAL' => 1,
         'CASCADED' => 1, 'CHECKSUM' => 1, 'DUMPFILE' => 1, 'EXTENDED' => 1,
         'FUNCTION' => 1, 'GEOMETRY' => 1, 'INNOBASE' => 1, 'LANGUAGE' => 1,
         'MAX_ROWS' => 1, 'MIN_ROWS' => 1, 'NATIONAL' => 1, 'NVARCHAR' => 1,
@@ -77,8 +77,8 @@ class ContextMySql50000 extends Context
         'VARIABLES' => 1,
         'BERKELEYDB' => 1, 'COMPRESSED' => 1, 'CONCURRENT' => 1, 'CONNECTION' => 1,
         'CONSISTENT' => 1, 'DEALLOCATE' => 1, 'IDENTIFIED' => 1, 'MASTER_SSL' => 1,
-        'NDBCLUSTER' => 1, 'PRIVILEGES' => 1, 'REPEATABLE' => 1, 'ROW_FORMAT' => 1,
-        'SQL_THREAD' => 1, 'TABLESPACE' => 1,
+        'NDBCLUSTER' => 1, 'PERSISTENT' => 1, 'PRIVILEGES' => 1, 'REPEATABLE' => 1,
+        'ROW_FORMAT' => 1, 'SQL_THREAD' => 1, 'TABLESPACE' => 1,
         'FRAC_SECOND' => 1, 'MASTER_HOST' => 1, 'MASTER_PORT' => 1, 'MASTER_USER' => 1,
         'PROCESSLIST' => 1, 'RAID_CHUNKS' => 1, 'REPLICATION' => 1, 'SQL_TSI_DAY' => 1,
         'TRANSACTION' => 1, 'UNCOMMITTED' => 1,
@@ -151,6 +151,7 @@ class ContextMySql50000 extends Context
         'CHARACTER SET' => 7, 'IF NOT EXISTS' => 7,
         'DATA DIRECTORY' => 7,
         'DEFAULT CHARSET' => 7, 'DEFAULT COLLATE' => 7, 'INDEX DIRECTORY' => 7,
+        'GENERATED ALWAYS' => 7,
         'DEFAULT CHARACTER SET' => 7,
 
         'XML' => 9,
diff --git a/src/Contexts/ContextMySql50100.php b/src/Contexts/ContextMySql50100.php
index fa43a6f..ad39eb7 100644
--- a/src/Contexts/ContextMySql50100.php
+++ b/src/Contexts/ContextMySql50100.php
@@ -67,7 +67,8 @@ class ContextMySql50100 extends Context
         'OPTIONS' => 1, 'PARTIAL' => 1, 'PLUGINS' => 1, 'PREPARE' => 1, 'PROFILE' => 1,
         'REBUILD' => 1, 'RECOVER' => 1, 'RESTORE' => 1, 'RETURNS' => 1, 'ROUTINE' => 1,
         'SESSION' => 1, 'STORAGE' => 1, 'STRIPED' => 1, 'SUBJECT' => 1, 'SUSPEND' => 1,
-        'UNICODE' => 1, 'UNKNOWN' => 1, 'UPGRADE' => 1, 'USE_FRM' => 1, 'WRAPPER' => 1,
+        'UNICODE' => 1, 'UNKNOWN' => 1, 'UPGRADE' => 1, 'USE_FRM' => 1, 'VIRTUAL' => 1,
+        'WRAPPER' => 1,
         'CASCADED' => 1, 'CHECKSUM' => 1, 'DATAFILE' => 1, 'DUMPFILE' => 1,
         'EXTENDED' => 1, 'FUNCTION' => 1, 'GEOMETRY' => 1, 'INNOBASE' => 1,
         'LANGUAGE' => 1, 'MAXVALUE' => 1, 'MAX_ROWS' => 1, 'MAX_SIZE' => 1,
@@ -83,9 +84,9 @@ class ContextMySql50100 extends Context
         'UNINSTALL' => 1, 'VARIABLES' => 1,
         'BERKELEYDB' => 1, 'COMPLETION' => 1, 'COMPRESSED' => 1, 'CONCURRENT' => 1,
         'CONNECTION' => 1, 'CONSISTENT' => 1, 'DEALLOCATE' => 1, 'IDENTIFIED' => 1,
-        'MASTER_SSL' => 1, 'NDBCLUSTER' => 1, 'PARTITIONS' => 1, 'PRIVILEGES' => 1,
-        'REORGANISE' => 1, 'REORGANIZE' => 1, 'REPEATABLE' => 1, 'ROW_FORMAT' => 1,
-        'SQL_THREAD' => 1, 'TABLESPACE' => 1,
+        'MASTER_SSL' => 1, 'NDBCLUSTER' => 1, 'PARTITIONS' => 1, 'PERSISTENT' => 1,
+        'PRIVILEGES' => 1, 'REORGANISE' => 1, 'REORGANIZE' => 1, 'REPEATABLE' => 1,
+        'ROW_FORMAT' => 1, 'SQL_THREAD' => 1, 'TABLESPACE' => 1,
         'EXTENT_SIZE' => 1, 'FRAC_SECOND' => 1, 'MASTER_HOST' => 1, 'MASTER_PORT' => 1,
         'MASTER_USER' => 1, 'PROCESSLIST' => 1, 'RAID_CHUNKS' => 1, 'REPLICATION' => 1,
         'SQL_TSI_DAY' => 1, 'TRANSACTION' => 1, 'UNCOMMITTED' => 1,
@@ -162,6 +163,7 @@ class ContextMySql50100 extends Context
         'CHARACTER SET' => 7, 'IF NOT EXISTS' => 7,
         'DATA DIRECTORY' => 7,
         'DEFAULT CHARSET' => 7, 'DEFAULT COLLATE' => 7, 'INDEX DIRECTORY' => 7,
+        'GENERATED ALWAYS' => 7,
         'DEFAULT CHARACTER SET' => 7,
 
         'XML' => 9,
diff --git a/src/Contexts/ContextMySql50500.php b/src/Contexts/ContextMySql50500.php
index 49afca3..c0074c7 100644
--- a/src/Contexts/ContextMySql50500.php
+++ b/src/Contexts/ContextMySql50500.php
@@ -67,7 +67,8 @@ class ContextMySql50500 extends Context
         'NO_WAIT' => 1, 'OPTIONS' => 1, 'PARTIAL' => 1, 'PLUGINS' => 1, 'PREPARE' => 1,
         'PROFILE' => 1, 'REBUILD' => 1, 'RECOVER' => 1, 'RESTORE' => 1, 'RETURNS' => 1,
         'ROUTINE' => 1, 'SESSION' => 1, 'STORAGE' => 1, 'SUBJECT' => 1, 'SUSPEND' => 1,
-        'UNICODE' => 1, 'UNKNOWN' => 1, 'UPGRADE' => 1, 'USE_FRM' => 1, 'WRAPPER' => 1,
+        'UNICODE' => 1, 'UNKNOWN' => 1, 'UPGRADE' => 1, 'USE_FRM' => 1, 'VIRTUAL' => 1,
+        'WRAPPER' => 1,
         'CASCADED' => 1, 'CHECKSUM' => 1, 'DATAFILE' => 1, 'DUMPFILE' => 1,
         'EXTENDED' => 1, 'FUNCTION' => 1, 'GEOMETRY' => 1, 'INNOBASE' => 1,
         'LANGUAGE' => 1, 'MAX_ROWS' => 1, 'MAX_SIZE' => 1, 'MIN_ROWS' => 1,
@@ -82,9 +83,9 @@ class ContextMySql50500 extends Context
         'TEMPTABLE' => 1, 'UNDEFINED' => 1, 'UNINSTALL' => 1, 'VARIABLES' => 1,
         'COMPLETION' => 1, 'COMPRESSED' => 1, 'CONCURRENT' => 1, 'CONNECTION' => 1,
         'CONSISTENT' => 1, 'DEALLOCATE' => 1, 'IDENTIFIED' => 1, 'MASTER_SSL' => 1,
-        'NDBCLUSTER' => 1, 'PARTITIONS' => 1, 'PRIVILEGES' => 1, 'REORGANIZE' => 1,
-        'REPEATABLE' => 1, 'ROW_FORMAT' => 1, 'SQL_THREAD' => 1, 'TABLESPACE' => 1,
-        'TABLE_NAME' => 1,
+        'NDBCLUSTER' => 1, 'PARTITIONS' => 1, 'PERSISTENT' => 1, 'PRIVILEGES' => 1,
+        'REORGANIZE' => 1, 'REPEATABLE' => 1, 'ROW_FORMAT' => 1, 'SQL_THREAD' => 1,
+        'TABLESPACE' => 1, 'TABLE_NAME' => 1,
         'COLUMN_NAME' => 1, 'CURSOR_NAME' => 1, 'EXTENT_SIZE' => 1, 'FRAC_SECOND' => 1,
         'MASTER_HOST' => 1, 'MASTER_PORT' => 1, 'MASTER_USER' => 1, 'MYSQL_ERRNO' => 1,
         'PROCESSLIST' => 1, 'REPLICATION' => 1, 'SCHEMA_NAME' => 1, 'SQL_TSI_DAY' => 1,
@@ -167,6 +168,7 @@ class ContextMySql50500 extends Context
         'CHARACTER SET' => 7, 'IF NOT EXISTS' => 7,
         'DATA DIRECTORY' => 7,
         'DEFAULT CHARSET' => 7, 'DEFAULT COLLATE' => 7, 'INDEX DIRECTORY' => 7,
+        'GENERATED ALWAYS' => 7,
         'DEFAULT CHARACTER SET' => 7,
 
         'XML' => 9,
diff --git a/src/Contexts/ContextMySql50600.php b/src/Contexts/ContextMySql50600.php
index 8c91bdb..453d9e2 100644
--- a/src/Contexts/ContextMySql50600.php
+++ b/src/Contexts/ContextMySql50600.php
@@ -68,7 +68,7 @@ class ContextMySql50600 extends Context
         'PLUGINS' => 1, 'PREPARE' => 1, 'PROFILE' => 1, 'REBUILD' => 1, 'RECOVER' => 1,
         'RESTORE' => 1, 'RETURNS' => 1, 'ROUTINE' => 1, 'SESSION' => 1, 'STORAGE' => 1,
         'SUBJECT' => 1, 'SUSPEND' => 1, 'UNICODE' => 1, 'UNKNOWN' => 1, 'UPGRADE' => 1,
-        'USE_FRM' => 1, 'WRAPPER' => 1,
+        'USE_FRM' => 1, 'VIRTUAL' => 1, 'WRAPPER' => 1,
         'CASCADED' => 1, 'CHECKSUM' => 1, 'DATAFILE' => 1, 'DUMPFILE' => 1,
         'EXCHANGE' => 1, 'EXTENDED' => 1, 'FUNCTION' => 1, 'GEOMETRY' => 1,
         'LANGUAGE' => 1, 'MAX_ROWS' => 1, 'MAX_SIZE' => 1, 'MIN_ROWS' => 1,
@@ -83,9 +83,9 @@ class ContextMySql50600 extends Context
         'UNDEFINED' => 1, 'UNINSTALL' => 1, 'VARIABLES' => 1,
         'COMPLETION' => 1, 'COMPRESSED' => 1, 'CONCURRENT' => 1, 'CONNECTION' => 1,
         'CONSISTENT' => 1, 'DEALLOCATE' => 1, 'IDENTIFIED' => 1, 'MASTER_SSL' => 1,
-        'NDBCLUSTER' => 1, 'PARTITIONS' => 1, 'PLUGIN_DIR' => 1, 'PRIVILEGES' => 1,
-        'REORGANIZE' => 1, 'REPEATABLE' => 1, 'ROW_FORMAT' => 1, 'SQL_THREAD' => 1,
-        'TABLESPACE' => 1, 'TABLE_NAME' => 1,
+        'NDBCLUSTER' => 1, 'PARTITIONS' => 1, 'PERSISTENT' => 1, 'PLUGIN_DIR' => 1,
+        'PRIVILEGES' => 1, 'REORGANIZE' => 1, 'REPEATABLE' => 1, 'ROW_FORMAT' => 1,
+        'SQL_THREAD' => 1, 'TABLESPACE' => 1, 'TABLE_NAME' => 1,
         'COLUMN_NAME' => 1, 'CURSOR_NAME' => 1, 'DIAGNOSTICS' => 1, 'EXTENT_SIZE' => 1,
         'MASTER_HOST' => 1, 'MASTER_PORT' => 1, 'MASTER_USER' => 1, 'MYSQL_ERRNO' => 1,
         'PROCESSLIST' => 1, 'REPLICATION' => 1, 'SCHEMA_NAME' => 1, 'SQL_TSI_DAY' => 1,
@@ -173,6 +173,7 @@ class ContextMySql50600 extends Context
         'CHARACTER SET' => 7, 'IF NOT EXISTS' => 7,
         'DATA DIRECTORY' => 7,
         'DEFAULT CHARSET' => 7, 'DEFAULT COLLATE' => 7, 'INDEX DIRECTORY' => 7,
+        'GENERATED ALWAYS' => 7,
         'DEFAULT CHARACTER SET' => 7,
 
         'XML' => 9,
diff --git a/src/Contexts/ContextMySql50700.php b/src/Contexts/ContextMySql50700.php
index b522e82..9946a26 100644
--- a/src/Contexts/ContextMySql50700.php
+++ b/src/Contexts/ContextMySql50700.php
@@ -85,9 +85,9 @@ class ContextMySql50700 extends Context
         'UNDEFINED' => 1, 'UNINSTALL' => 1, 'VARIABLES' => 1,
         'COMPLETION' => 1, 'COMPRESSED' => 1, 'CONCURRENT' => 1, 'CONNECTION' => 1,
         'CONSISTENT' => 1, 'DEALLOCATE' => 1, 'IDENTIFIED' => 1, 'MASTER_SSL' => 1,
-        'NDBCLUSTER' => 1, 'PARTITIONS' => 1, 'PLUGIN_DIR' => 1, 'PRIVILEGES' => 1,
-        'REORGANIZE' => 1, 'REPEATABLE' => 1, 'ROW_FORMAT' => 1, 'SQL_THREAD' => 1,
-        'TABLESPACE' => 1, 'TABLE_NAME' => 1, 'VALIDATION' => 1,
+        'NDBCLUSTER' => 1, 'PARTITIONS' => 1, 'PERSISTENT' => 1, 'PLUGIN_DIR' => 1,
+        'PRIVILEGES' => 1, 'REORGANIZE' => 1, 'REPEATABLE' => 1, 'ROW_FORMAT' => 1,
+        'SQL_THREAD' => 1, 'TABLESPACE' => 1, 'TABLE_NAME' => 1, 'VALIDATION' => 1,
         'COLUMN_NAME' => 1, 'COMPRESSION' => 1, 'CURSOR_NAME' => 1, 'DIAGNOSTICS' => 1,
         'EXTENT_SIZE' => 1, 'MASTER_HOST' => 1, 'MASTER_PORT' => 1, 'MASTER_USER' => 1,
         'MYSQL_ERRNO' => 1, 'NONBLOCKING' => 1, 'PROCESSLIST' => 1, 'REPLICATION' => 1,
@@ -181,6 +181,7 @@ class ContextMySql50700 extends Context
         'CHARACTER SET' => 7, 'IF NOT EXISTS' => 7,
         'DATA DIRECTORY' => 7,
         'DEFAULT CHARSET' => 7, 'DEFAULT COLLATE' => 7, 'INDEX DIRECTORY' => 7,
+        'GENERATED ALWAYS' => 7,
         'DEFAULT CHARACTER SET' => 7,
 
         'XML' => 9,
diff --git a/src/Statement.php b/src/Statement.php
index a9ee3d3..f2d72b3 100644
--- a/src/Statement.php
+++ b/src/Statement.php
@@ -95,7 +95,7 @@ abstract class Statement
     }
 
     /**
-     * Builds the statement.
+     * Builds the string representation of this statement.
      *
      * @return string
      */
@@ -292,4 +292,15 @@ abstract class Statement
     {
 
     }
+
+    /**
+     * Builds the string representation of this statement.
+     *
+     * @see static::build
+     *
+     * @return string
+     */
+    public function __toString() {
+        return static::build($this);
+    }
 }
diff --git a/tests/Builder/StatementTest.php b/tests/Builder/StatementTest.php
index e02324d..0dff320 100644
--- a/tests/Builder/StatementTest.php
+++ b/tests/Builder/StatementTest.php
@@ -36,7 +36,7 @@ class StatementTest extends TestCase
             'FROM `film`, `actor` ' .
             'WHERE film_id > 10 OR actor.age > 25 ' .
             'LIMIT 10, 1 ',
-            $stmt->build()
+            (string) $stmt
         );
     }
 }
diff --git a/tests/Components/OptionsArrayTest.php b/tests/Components/OptionsArrayTest.php
index 42f54dd..8c24e3b 100644
--- a/tests/Components/OptionsArrayTest.php
+++ b/tests/Components/OptionsArrayTest.php
@@ -14,7 +14,7 @@ class OptionsArrayTest extends TestCase
     {
         $component = OptionsArray::parse(
             new Parser(),
-            $this->getTokensList('A B = (test) C'),
+            $this->getTokensList('A B = /*comment*/ (test) C'),
             array(
                 'A' => 1,
                 'B' => array(2, 'var'),
@@ -26,9 +26,9 @@ class OptionsArrayTest extends TestCase
                 1 => 'A',
                 2 => array(
                     'name' => 'B',
-                    'value' => 'test',
-                    'value_' => 'test',
-                    'equal' => false,
+                    'value' => '(test)',
+                    'value_' => '(test)',
+                    'equal' => true,
                 ),
                 3 => 'C',
             ),
@@ -36,6 +36,20 @@ class OptionsArrayTest extends TestCase
         );
     }
 
+    public function testParseExpr()
+    {
+        $component = OptionsArray::parse(
+            new Parser(),
+            $this->getTokensList('SUM = (3 + 5) RESULT = 8'),
+            array(
+                'SUM' => array(1, 'expr', array('bracketsDelimited' => true)),
+                'RESULT' => array(2, 'var'),
+            )
+        );
+        $this->assertEquals('(3 + 5)', (string) $component->has('SUM'));
+        $this->assertEquals('8', $component->has('RESULT'));
+    }
+
     public function testHas()
     {
         $component = new OptionsArray(
diff --git a/tests/Parser/CreateStatementTest.php b/tests/Parser/CreateStatementTest.php
index eef8183..9f56a6b 100644
--- a/tests/Parser/CreateStatementTest.php
+++ b/tests/Parser/CreateStatementTest.php
@@ -25,6 +25,7 @@ class CreateStatementTest extends TestCase
             array('parseCreateProcedure2'),
             array('parseCreateTable'),
             array('parseCreateTable2'),
+            array('parseCreateTable3'),
             array('parseCreateTableErr1'),
             array('parseCreateTrigger'),
             array('parseCreateUser'),
diff --git a/tests/data/parseCreateTable3.in b/tests/data/parseCreateTable3.in
new file mode 100644
index 0000000..05f2bc0
--- /dev/null
+++ b/tests/data/parseCreateTable3.in
@@ -0,0 +1,6 @@
+CREATE TABLE table1 (
+    a INT NOT NULL,
+    b VARCHAR(32),
+    c INT AS (a mod 10) VIRTUAL,
+    d VARCHAR(5) AS (left(b,5)) PERSISTENT
+);
\ No newline at end of file
diff --git a/tests/data/parseCreateTable3.out b/tests/data/parseCreateTable3.out
new file mode 100644
index 0000000..6a629f0
--- /dev/null
+++ b/tests/data/parseCreateTable3.out
@@ -0,0 +1,6 @@
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\ No newline at end of file
diff --git a/tests/data/parseSelect2.out b/tests/data/parseSelect2.out
index a5d09c3..47a5cd9 100644
--- a/tests/data/parseSelect2.out
+++ b/tests/data/parseSelect2.out
@@ -1 +1 @@
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