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<?php
namespace SqlParser\Fragments;
use SqlParser\Fragment;
use SqlParser\Lexer;
use SqlParser\Parser;
use SqlParser\Token;
use SqlParser\TokensList;
/**
* `SELECT` keyword parser.
*/
class SelectKeyword extends Fragment
{
/**
* @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 FieldFragment[]
*/
public static function parse(Parser $parser, TokensList $list, array $options = array())
{
$ret = array();
$expr = null;
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) || ($token->type === Token::TYPE_COMMENT)) {
continue;
}
if ($token->type === Token::TYPE_KEYWORD) {
// No keyword is expected.
break;
}
if (($token->type === Token::TYPE_OPERATOR) && ($token->value === ',')) {
$ret[] = $expr;
} else {
$expr = FieldFragment::parse($parser, $list);
if ($expr === null) {
break;
}
}
}
// Last iteration was not processed.
if (!empty($expr->tokens)) {
$ret[] = $expr;
}
--$list->idx;
return $ret;
}
}
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