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AlterOperation.php
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Array2d.php
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ArrayObj.php
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CaseExpression.php
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IntoKeyword.php
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Code Editor : IndexHint.php
<?php /** * Parses an Index hint. */ declare(strict_types=1); namespace PhpMyAdmin\SqlParser\Components; use PhpMyAdmin\SqlParser\Component; use PhpMyAdmin\SqlParser\Parser; use PhpMyAdmin\SqlParser\Token; use PhpMyAdmin\SqlParser\TokensList; use function implode; use function is_array; /** * Parses an Index hint. */ class IndexHint extends Component { /** * The type of hint (USE/FORCE/IGNORE) * * @var string */ public $type; /** * What the hint is for (INDEX/KEY) * * @var string */ public $indexOrKey; /** * The clause for which this hint is (JOIN/ORDER BY/GROUP BY) * * @var string */ public $for; /** * List of indexes in this hint * * @var array */ public $indexes = []; /** * @param string $type the type of hint (USE/FORCE/IGNORE) * @param string $indexOrKey What the hint is for (INDEX/KEY) * @param string $for the clause for which this hint is (JOIN/ORDER BY/GROUP BY) * @param array $indexes List of indexes in this hint */ public function __construct( ?string $type = null, ?string $indexOrKey = null, ?string $for = null, array $indexes = [] ) { $this->type = $type; $this->indexOrKey = $indexOrKey; $this->for = $for; $this->indexes = $indexes; } /** * @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 IndexHint|Component[] */ public static function parse(Parser $parser, TokensList $list, array $options = []) { $ret = []; $expr = new static(); $expr->type = $options['type'] ?? null; /** * The state of the parser. * * Below are the states of the parser. * 0 ----------------- [ USE/IGNORE/FORCE ]-----------------> 1 * 1 -------------------- [ INDEX/KEY ] --------------------> 2 * 2 ----------------------- [ FOR ] -----------------------> 3 * 2 -------------------- [ expr_list ] --------------------> 0 * 3 -------------- [ JOIN/GROUP BY/ORDER BY ] -------------> 4 * 4 -------------------- [ expr_list ] --------------------> 0 * * @var int */ $state = 0; // By design, the parser will parse first token after the keyword. So, the keyword // must be analyzed too, in order to determine the type of this index hint. if ($list->idx > 0) { --$list->idx; } for (; $list->idx < $list->count; ++$list->idx) { /** * Token parsed at this moment. * * @var Token */ $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) || ($token->type === Token::TYPE_COMMENT)) { continue; } switch ($state) { case 0: if ($token->type === Token::TYPE_KEYWORD) { if ($token->keyword === 'USE' || $token->keyword === 'IGNORE' || $token->keyword === 'FORCE') { $expr->type = $token->keyword; $state = 1; } else { break 2; } } break; case 1: if ($token->type === Token::TYPE_KEYWORD) { if ($token->keyword === 'INDEX' || $token->keyword === 'KEY') { $expr->indexOrKey = $token->keyword; } else { $parser->error('Unexpected keyword.', $token); } $state = 2; } else { // we expect the token to be a keyword $parser->error('Unexpected token.', $token); } break; case 2: if ($token->type === Token::TYPE_KEYWORD && $token->keyword === 'FOR') { $state = 3; } else { $expr->indexes = ExpressionArray::parse($parser, $list); $state = 0; $ret[] = $expr; $expr = new static(); } break; case 3: if ($token->type === Token::TYPE_KEYWORD) { if ($token->keyword === 'JOIN' || $token->keyword === 'GROUP BY' || $token->keyword === 'ORDER BY' ) { $expr->for = $token->keyword; } else { $parser->error('Unexpected keyword.', $token); } $state = 4; } else { // we expect the token to be a keyword $parser->error('Unexpected token.', $token); } break; case 4: $expr->indexes = ExpressionArray::parse($parser, $list); $state = 0; $ret[] = $expr; $expr = new static(); break; } } --$list->idx; return $ret; } /** * @param IndexHint|IndexHint[] $component the component to be built * @param array $options parameters for building * * @return string */ public static function build($component, array $options = []) { if (is_array($component)) { return implode(' ', $component); } $ret = $component->type . ' ' . $component->indexOrKey . ' '; if ($component->for !== null) { $ret .= 'FOR ' . $component->for . ' '; } return $ret . ExpressionArray::build($component->indexes); } }
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