147 lines
3.8 KiB
PHP
147 lines
3.8 KiB
PHP
<?php
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/**
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* `RENAME TABLE` keyword parser.
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*
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* @package SqlParser
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* @subpackage Components
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*/
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namespace SqlParser\Components;
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use SqlParser\Component;
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use SqlParser\Parser;
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use SqlParser\Token;
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use SqlParser\TokensList;
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/**
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* `RENAME TABLE` keyword parser.
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*
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* @category Keywords
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* @package SqlParser
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* @subpackage Components
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* @author Dan Ungureanu <udan1107@gmail.com>
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* @license http://opensource.org/licenses/GPL-2.0 GNU Public License
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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 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 $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 $options = array())
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{
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$ret = array();
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$expr = new RenameOperation();
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/**
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* The state of the parser.
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*
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* Below are the states of the parser.
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*
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* 0 ---------------------[ old name ]--------------------> 1
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*
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* 1 ------------------------[ TO ]-----------------------> 2
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*
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* 2 ---------------------[ old name ]--------------------> 3
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*
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* 3 ------------------------[ , ]------------------------> 0
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* 3 -----------------------[ else ]----------------------> -1
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*
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* @var int
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*/
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$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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* @var Token $token
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*/
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$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) || ($token->type === Token::TYPE_COMMENT)) {
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continue;
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}
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if (($token->type === Token::TYPE_KEYWORD) && ($token->flags & Token::FLAG_KEYWORD_RESERVED)) {
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if (($state === 1) && ($token->value === 'TO')) {
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$state = 2;
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continue;
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}
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// No other keyword is expected.
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break;
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}
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if ($token->type === Token::TYPE_OPERATOR) {
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if (($state === 3) && ($token->value === ',')) {
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$ret[] = $expr;
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$expr = new RenameOperation();
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$state = 0;
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continue;
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}
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// No other operator is expected.
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break;
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}
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if ($state == 0) {
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$expr->old = Expression::parse(
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$parser,
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$list,
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array(
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'noAlias' => true,
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'noBrackets' => true,
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'skipColumn' => true,
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)
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);
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$state = 1;
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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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array(
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'noBrackets' => true,
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'skipColumn' => true,
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'noAlias' => true,
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)
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);
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$state = 3;
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}
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}
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// Last iteration was not saved.
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if (!empty($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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