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<?php
/**
* Parses a a list of expression delimited by a comma.
*
* @package SqlParser
* @subpackage Components
*/
namespace SqlParser\Components;
use SqlParser\Component;
use SqlParser\Parser;
use SqlParser\Token;
use SqlParser\TokensList;
/**
* Parses a a list of expression delimited by a comma.
*
* @category Keywords
* @package SqlParser
* @subpackage Components
* @author Dan Ungureanu <udan1107@gmail.com>
* @license http://opensource.org/licenses/GPL-2.0 GNU Public License
*/
class ExpressionArray extends Component
{
/**
* @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 Expression[]
*/
public static function parse(Parser $parser, TokensList $list, array $options = array())
{
$ret = array();
/**
* The state of the parser.
*
* Below are the states of the parser.
*
* 0 ----------------------[ array ]---------------------> 1
*
* 1 ------------------------[ , ]------------------------> 0
* 1 -----------------------[ else ]----------------------> -1
*
* @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) || ($token->type === Token::TYPE_COMMENT)) {
continue;
}
if (($token->type === Token::TYPE_KEYWORD)
&& ($token->flags & Token::FLAG_KEYWORD_RESERVED)
&& ($token->value !== 'DUAL')
) {
// No keyword is expected.
break;
}
if ($state === 0) {
$expr = Expression::parse($parser, $list, $options);
if ($expr === null) {
break;
}
$ret[] = $expr;
$state = 1;
} elseif ($state === 1) {
if ($token->value === ',') {
$state = 0;
} else {
break;
}
}
}
if ($state === 0) {
$parser->error(
__('An expression was expected.'),
$list->tokens[$list->idx]
);
}
--$list->idx;
return $ret;
}
/**
* @param Expression[] $component The component to be built.
*
* @return string
*/
public static function build($component)
{
$ret = array();
foreach ($component as $frag) {
$ret[] = $frag::build($frag);
}
return implode($ret, ', ');
}
}
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