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<?php
namespace SqlParser\Fragments;
use SqlParser\Fragment;
use SqlParser\Lexer;
use SqlParser\Parser;
use SqlParser\Token;
use SqlParser\TokensList;
/**
* Parses an array.
*/
class ArrayFragment extends Fragment
{
/**
* The array.
*
* @var array
*/
public $array = array();
/**
* @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 ArrayFragment
*/
public static function parse(Parser $parser, TokensList $list, array $options = array())
{
$ret = new ArrayFragment();
/**
* The state of the parser.
*
* Below are the states of the parser.
*
* 0 -----------------------[ ( ]------------------------> 1
*
* 1 ------------------[ array element ]-----------------> 2
*
* 2 ------------------------[ , ]-----------------------> 1
* 2 ------------------------[ ) ]-----------------------> -1
*
* @var int
*/
$state = 0;
for (; $list->idx < $list->count; ++$list->idx) {
/** @var Token Token parsed at this moment. */
$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 !== '(')) {
$parser->error('An open bracket was expected.', $token);
break;
}
$state = 1;
} elseif ($state === 1) {
if (($token->type === Token::TYPE_OPERATOR) && ($token->value === ')')) {
// Empty array.
break;
}
$ret->array[] = $token->value;
$ret->tokens[] = $token;
$state = 2;
} elseif ($state === 2) {
if (($token->type !== Token::TYPE_OPERATOR) || (($token->value !== ',') && ($token->value !== ')'))) {
$parser->error('Symbols \')\' or \',\' were expected', $token);
break;
}
if ($token->value === ',') {
$state = 1;
} else { // )
break;
}
}
}
return $ret;
}
}
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