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<?php
/**
* `WHERE` keyword parser.
*
* @package SqlParser
* @subpackage Fragments
*/
namespace SqlParser\Fragments;
use SqlParser\Fragment;
use SqlParser\Parser;
use SqlParser\Token;
use SqlParser\TokensList;
/**
* `WHERE` keyword parser.
*
* @category Keywords
* @package SqlParser
* @subpackage Fragments
* @author Dan Ungureanu <udan1107@gmail.com>
* @license http://opensource.org/licenses/GPL-2.0 GNU Public License
*/
class WhereKeyword extends Fragment
{
/**
* Logical operators that can be used to chain expressions.
*
* @var array
*/
public static $OPERATORS = array('&&', '(', ')', 'AND', 'OR', 'XOR', '||');
/**
* Whether this fragment is an operator.
*
* @var bool
*/
public $isOperator = false;
/**
* The condition.
*
* @var string
*/
public $expr;
/**
* Constructor.
*
* @param string $expr The condition or the operator.
*/
public function __construct($expr = null)
{
$this->expr = trim($expr);
}
/**
* @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 WhereKeyword[]
*/
public static function parse(Parser $parser, TokensList $list, array $options = array())
{
$ret = array();
/**
* The condition that was parsed so far.
* @var string
*/
$tmp = '';
for (; $list->idx < $list->count; ++$list->idx) {
/**
* Token parsed at this moment.
* @var 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_COMMENT) {
continue;
}
// Conditions are delimited by logical operators.
if (in_array($token->value, static::$OPERATORS, true)) {
if (!empty(trim($tmp))) {
// Adding the condition that is delimited by this operator.
$ret[] = new WhereKeyword($tmp);
$tmp = '';
}
// Adding the operator.
$expr = new WhereKeyword($token->value);
$expr->isOperator = true;
$ret[] = $expr;
continue;
}
// No keyword is expected.
if (($token->type === Token::TYPE_KEYWORD) && ($token->flags & Token::FLAG_KEYWORD_RESERVED)) {
break;
}
$tmp .= $token->token;
}
// Last iteration was not processed.
if (!empty(trim($tmp))) {
$ret[] = new WhereKeyword($tmp);
}
--$list->idx;
return $ret;
}
/**
* @param WhereKeyword[] $fragment The fragment to be built.
*
* @return string
*/
public static function build($fragment)
{
$ret = array();
foreach ($fragment as $f) {
$ret[] = $f->expr;
}
return implode(' ', $ret);
}
}
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