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RenameOperations.php
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RenameOperations.php
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<?php
declare(strict_types=1);
namespace PhpMyAdmin\SqlParser\Parsers;
use PhpMyAdmin\SqlParser\Components\RenameOperation;
use PhpMyAdmin\SqlParser\Parseable;
use PhpMyAdmin\SqlParser\Parser;
use PhpMyAdmin\SqlParser\TokensList;
use PhpMyAdmin\SqlParser\TokenType;
use function implode;
/**
* `RENAME TABLE` keyword parser.
*/
final class RenameOperations 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 RenameOperation[]
*/
public static function parse(Parser $parser, TokensList $list, array $options = []): array
{
$ret = [];
$expr = new RenameOperation();
/**
* The state of the parser.
*
* Below are the states of the parser.
*
* 0 ---------------------[ old name ]--------------------> 1
*
* 1 ------------------------[ TO ]-----------------------> 2
*
* 2 ---------------------[ new name ]--------------------> 3
*
* 3 ------------------------[ , ]------------------------> 0
* 3 -----------------------[ else ]----------------------> (END)
*/
$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->old = Expressions::parse(
$parser,
$list,
[
'breakOnAlias' => true,
'parseField' => 'table',
],
);
if (empty($expr->old)) {
$parser->error('The old name of the table was expected.', $token);
}
$state = 1;
} elseif ($state === 1) {
if ($token->type !== TokenType::Keyword || $token->keyword !== 'TO') {
$parser->error('Keyword "TO" was expected.', $token);
break;
}
$state = 2;
} elseif ($state === 2) {
$expr->new = Expressions::parse(
$parser,
$list,
[
'breakOnAlias' => true,
'parseField' => 'table',
],
);
if (empty($expr->new)) {
$parser->error('The new name of the table was expected.', $token);
}
$state = 3;
} else {
if (($token->type !== TokenType::Operator) || ($token->value !== ',')) {
break;
}
$ret[] = $expr;
$expr = new RenameOperation();
$state = 0;
}
}
if ($state !== 3) {
$parser->error('A rename operation was expected.', $list->tokens[$list->idx - 1]);
}
// Last iteration was not saved.
if (! empty($expr->old)) {
$ret[] = $expr;
}
--$list->idx;
return $ret;
}
/** @param RenameOperation[] $component the component to be built */
public static function buildAll(array $component): string
{
return implode(', ', $component);
}
}