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<?php
/**
* The definition of a parameter of a function or procedure.
*
* @package SqlParser
* @subpackage Components
*/
namespace SqlParser\Components;
use SqlParser\Context;
use SqlParser\Component;
use SqlParser\Parser;
use SqlParser\Token;
use SqlParser\TokensList;
/**
* The definition of a parameter of a function or procedure.
*
* @category Components
* @package SqlParser
* @subpackage Components
* @author Dan Ungureanu <udan1107@gmail.com>
* @license http://opensource.org/licenses/GPL-2.0 GNU Public License
*/
class ParameterDefinition extends Component
{
/**
* The name of the new column.
*
* @var string
*/
public $name;
/**
* Parameter's direction (IN, OUT or INOUT).
*
* @var string
*/
public $inOut;
/**
* The data type of thew new column.
*
* @var DataType
*/
public $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 ParameterDefinition[]
*/
public static function parse(Parser $parser, TokensList $list, array $options = array())
{
$ret = array();
$expr = new ParameterDefinition();
/**
* The state of the parser.
*
* Below are the states of the parser.
*
* 0 -----------------------[ ( ]------------------------> 1
*
* 1 ----------------[ IN / OUT / INOUT ]----------------> 1
* 1 ----------------------[ name ]----------------------> 2
*
* 2 -------------------[ data type ]--------------------> 3
*
* 3 ------------------------[ , ]-----------------------> 1
* 3 ------------------------[ ) ]-----------------------> (END)
*
* @var int $state
*/
$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) {
if (($token->type === Token::TYPE_OPERATOR) && ($token->value === '(')) {
$state = 1;
}
continue;
} elseif ($state === 1) {
if (($token->value === 'IN') || ($token->value === 'OUT') || ($token->value === 'INOUT')) {
$expr->inOut = $token->value;
++$list->idx;
} elseif ($token->value === ')') {
++$list->idx;
break;
} else {
$expr->name = $token->value;
$state = 2;
}
} elseif ($state === 2) {
$expr->type = DataType::parse($parser, $list);
$state = 3;
} elseif ($state === 3) {
$ret[] = $expr;
$expr = new ParameterDefinition();
if ($token->value === ',') {
$state = 1;
} elseif ($token->value === ')') {
++$list->idx;
break;
}
}
}
// Last iteration was not saved.
if ((isset($expr->name)) && ($expr->name !== '')) {
$ret[] = $expr;
}
--$list->idx;
return $ret;
}
/**
* @param ParameterDefinition[] $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) . ')';
} else {
$tmp = '';
if (!empty($component->inOut)) {
$tmp .= $component->inOut . ' ';
}
return trim(
$tmp . Context::escape($component->name) . ' ' . $component->type
);
}
}
}