/
OrderKeywords.php
98 lines (82 loc) · 2.76 KB
/
OrderKeywords.php
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<?php
declare(strict_types=1);
namespace PhpMyAdmin\SqlParser\Parsers;
use PhpMyAdmin\SqlParser\Components\OrderKeyword;
use PhpMyAdmin\SqlParser\Parseable;
use PhpMyAdmin\SqlParser\Parser;
use PhpMyAdmin\SqlParser\TokensList;
use PhpMyAdmin\SqlParser\TokenType;
use function implode;
/**
* `ORDER BY` keyword parser.
*/
final class OrderKeywords implements Parseable
{
/**
* @param Parser $parser the parser that serves as context
* @param TokensList $list the list of tokens that are being parsed
* @param array<string, mixed> $options parameters for parsing
*
* @return OrderKeyword[]
*/
public static function parse(Parser $parser, TokensList $list, array $options = []): array
{
$ret = [];
$expr = new OrderKeyword();
/**
* The state of the parser.
*
* Below are the states of the parser.
*
* 0 --------------------[ expression ]-------------------> 1
*
* 1 ------------------------[ , ]------------------------> 0
* 1 -------------------[ ASC / DESC ]--------------------> 1
*/
$state = 0;
for (; $list->idx < $list->count; ++$list->idx) {
/**
* Token parsed at this moment.
*/
$token = $list->tokens[$list->idx];
// End of statement.
if ($token->type === TokenType::Delimiter) {
break;
}
// Skipping whitespaces and comments.
if (($token->type === TokenType::Whitespace) || ($token->type === TokenType::Comment)) {
continue;
}
if ($state === 0) {
$expr->expr = Expressions::parse($parser, $list);
$state = 1;
} else {
if (
($token->type === TokenType::Keyword)
&& (($token->keyword === 'ASC') || ($token->keyword === 'DESC'))
) {
$expr->type = $token->keyword;
} elseif (($token->type === TokenType::Operator) && ($token->value === ',')) {
if (! empty($expr->expr)) {
$ret[] = $expr;
}
$expr = new OrderKeyword();
$state = 0;
} else {
break;
}
}
}
// Last iteration was not processed.
if (! empty($expr->expr)) {
$ret[] = $expr;
}
--$list->idx;
return $ret;
}
/** @param OrderKeyword[] $component the component to be built */
public static function buildAll(array $component): string
{
return implode(', ', $component);
}
}