168 lines
4.5 KiB
PHP
168 lines
4.5 KiB
PHP
<?php
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declare(strict_types=1);
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namespace PhpMyAdmin\SqlParser\Components;
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use PhpMyAdmin\SqlParser\Component;
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use PhpMyAdmin\SqlParser\Parser;
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use PhpMyAdmin\SqlParser\Token;
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use PhpMyAdmin\SqlParser\TokensList;
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use function implode;
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use function is_array;
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/**
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* `RENAME TABLE` keyword parser.
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*
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* @final
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*/
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class RenameOperation extends Component
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{
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/**
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* The old table name.
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*
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* @var Expression
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*/
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public $old;
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/**
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* The new table name.
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*
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* @var Expression
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*/
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public $new;
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/**
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* @param Expression $old old expression
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* @param Expression $new new expression containing new name
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*/
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public function __construct($old = null, $new = null)
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{
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$this->old = $old;
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$this->new = $new;
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}
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/**
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* @param Parser $parser the parser that serves as context
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* @param TokensList $list the list of tokens that are being parsed
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* @param array<string, mixed> $options parameters for parsing
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*
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* @return RenameOperation[]
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*/
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public static function parse(Parser $parser, TokensList $list, array $options = [])
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{
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$ret = [];
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$expr = new static();
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/**
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* The state of the parser.
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*
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* Below are the states of the parser.
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*
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* 0 ---------------------[ old name ]--------------------> 1
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*
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* 1 ------------------------[ TO ]-----------------------> 2
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*
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* 2 ---------------------[ new name ]--------------------> 3
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*
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* 3 ------------------------[ , ]------------------------> 0
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* 3 -----------------------[ else ]----------------------> (END)
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*
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* @var int
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*/
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$state = 0;
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for (; $list->idx < $list->count; ++$list->idx) {
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/**
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* Token parsed at this moment.
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*/
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$token = $list->tokens[$list->idx];
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// End of statement.
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if ($token->type === Token::TYPE_DELIMITER) {
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break;
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}
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// Skipping whitespaces and comments.
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if (($token->type === Token::TYPE_WHITESPACE) || ($token->type === Token::TYPE_COMMENT)) {
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continue;
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}
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if ($state === 0) {
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$expr->old = Expression::parse(
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$parser,
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$list,
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[
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'breakOnAlias' => true,
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'parseField' => 'table',
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]
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);
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if (empty($expr->old)) {
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$parser->error('The old name of the table was expected.', $token);
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}
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$state = 1;
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} elseif ($state === 1) {
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if ($token->type !== Token::TYPE_KEYWORD || $token->keyword !== 'TO') {
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$parser->error('Keyword "TO" was expected.', $token);
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break;
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}
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$state = 2;
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} elseif ($state === 2) {
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$expr->new = Expression::parse(
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$parser,
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$list,
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[
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'breakOnAlias' => true,
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'parseField' => 'table',
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]
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);
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if (empty($expr->new)) {
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$parser->error('The new name of the table was expected.', $token);
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}
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$state = 3;
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} elseif ($state === 3) {
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if (($token->type !== Token::TYPE_OPERATOR) || ($token->value !== ',')) {
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break;
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}
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$ret[] = $expr;
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$expr = new static();
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$state = 0;
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}
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}
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if ($state !== 3) {
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$parser->error('A rename operation was expected.', $list->tokens[$list->idx - 1]);
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}
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// Last iteration was not saved.
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if (! empty($expr->old)) {
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$ret[] = $expr;
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}
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--$list->idx;
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return $ret;
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}
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/**
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* @param RenameOperation $component the component to be built
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* @param array<string, mixed> $options parameters for building
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*
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* @return string
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*/
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public static function build($component, array $options = [])
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{
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if (is_array($component)) {
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return implode(', ', $component);
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}
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return $component->old . ' TO ' . $component->new;
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}
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}
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