Viewing file:  WithStatement.php (11.07 KB) -rwxr-x---
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<?php
declare(strict_types=1);
namespace PhpMyAdmin\SqlParser\Statements;
use PhpMyAdmin\SqlParser\Components\Array2d;
use PhpMyAdmin\SqlParser\Components\OptionsArray;
use PhpMyAdmin\SqlParser\Components\WithKeyword;
use PhpMyAdmin\SqlParser\Exceptions\ParserException;
use PhpMyAdmin\SqlParser\Parser;
use PhpMyAdmin\SqlParser\Statement;
use PhpMyAdmin\SqlParser\Token;
use PhpMyAdmin\SqlParser\TokensList;
use PhpMyAdmin\SqlParser\Translator;
use function array_slice;
use function count;
/**
* `WITH` statement.
* WITH [RECURSIVE] query_name [ (column_name [,...]) ] AS (SELECT ...) [, ...]
*/
final class WithStatement extends Statement
{
/**
* Options for `WITH` statements and their slot ID.
*
* @var array<string, int|array<int, int|string>>
* @psalm-var array<string, (positive-int|array{positive-int, ('var'|'var='|'expr'|'expr=')})>
*/
public static $OPTIONS = ['RECURSIVE' => 1];
/**
* The clauses of this statement, in order.
*
* @see Statement::$CLAUSES
*
* @var array<string, array<int, int|string>>
* @psalm-var array<string, array{non-empty-string, (1|2|3)}>
*/
public static $CLAUSES = [
'WITH' => [
'WITH',
2,
],
// Used for options.
'_OPTIONS' => [
'_OPTIONS',
1,
],
'AS' => [
'AS',
2,
],
];
/** @var WithKeyword[] */
public $withers = [];
/**
* holds the CTE parser.
*
* @var Parser|null
*/
public $cteStatementParser;
/**
* @param Parser $parser the instance that requests parsing
* @param TokensList $list the list of tokens to be parsed
*
* @return void
*/
public function parse(Parser $parser, TokensList $list)
{
/**
* The state of the parser.
*
* Below are the states of the parser.
*
* 0 ---------------- [ name ] -----------------> 1
*
* 1 ------------------ [ ( ] ------------------> 2
*
* 2 ------------------ [ AS ] -----------------> 3
*
* 3 ------------------ [ ( ] ------------------> 4
*
* 4 ------------------ [ , ] ------------------> 1
*
* 4 ----- [ SELECT/UPDATE/DELETE/INSERT ] -----> 5
*
* @var int
*/
$state = 0;
$wither = null;
++$list->idx; // Skipping `WITH`.
// parse any options if provided
$this->options = OptionsArray::parse($parser, $list, static::$OPTIONS);
++$list->idx;
for (; $list->idx < $list->count; ++$list->idx) {
/**
* Token parsed at this moment.
*/
$token = $list->tokens[$list->idx];
// Skipping whitespaces and comments.
if ($token->type === Token::TYPE_WHITESPACE || $token->type === Token::TYPE_COMMENT) {
continue;
}
if ($state === 0) {
if ($token->type !== Token::TYPE_NONE) {
$parser->error('The name of the CTE was expected.', $token);
break;
}
$wither = $token->value;
$this->withers[$wither] = new WithKeyword($wither);
$state = 1;
} elseif ($state === 1) {
if ($token->type === Token::TYPE_OPERATOR && $token->value === '(') {
$this->withers[$wither]->columns = Array2d::parse($parser, $list);
$state = 2;
} elseif ($token->type === Token::TYPE_KEYWORD && $token->keyword === 'AS') {
$state = 3;
} else {
$parser->error('Unexpected token.', $token);
break;
}
} elseif ($state === 2) {
if (! ($token->type === Token::TYPE_KEYWORD && $token->keyword === 'AS')) {
$parser->error('AS keyword was expected.', $token);
break;
}
$state = 3;
} elseif ($state === 3) {
$idxBeforeGetNext = $list->idx;
$list->idx++; // Ignore the current token
$nextKeyword = $list->getNext();
if (! ($token->value === '(' && ($nextKeyword && $nextKeyword->value === 'SELECT'))) {
$parser->error('Subquery of the CTE was expected.', $token);
$list->idx = $idxBeforeGetNext;
break;
}
// Restore the index
$list->idx = $idxBeforeGetNext;
++$list->idx;
$subList = $this->getSubTokenList($list);
if ($subList instanceof ParserException) {
$parser->errors[] = $subList;
break;
}
$subParser = new Parser($subList);
if (count($subParser->errors)) {
foreach ($subParser->errors as $error) {
$parser->errors[] = $error;
}
break;
}
$this->withers[$wither]->statement = $subParser;
$state = 4;
} elseif ($state === 4) {
if ($token->value === ',') {
// There's another WITH expression to parse, go back to state=0
$state = 0;
continue;
}
if (
$token->type === Token::TYPE_KEYWORD && (
$token->value === 'SELECT'
|| $token->value === 'INSERT'
|| $token->value === 'UPDATE'
|| $token->value === 'DELETE'
)
) {
$state = 5;
--$list->idx;
continue;
}
$parser->error('An expression was expected.', $token);
break;
} elseif ($state === 5) {
/**
* We need to parse all of the remaining tokens becuase mostly, they are only the CTE expression
* which's mostly is SELECT, or INSERT, UPDATE, or delete statement.
* e.g: INSERT .. ( SELECT 1 ) SELECT col1 FROM cte ON DUPLICATE KEY UPDATE col_name = 3.
* The issue is that, `ON DUPLICATE KEY UPDATE col_name = 3` is related to the main INSERT query
* not the cte expression (SELECT col1 FROM cte) we need to determine the end of the expression
* to parse `ON DUPLICATE KEY UPDATE` from the InsertStatement parser instead.
*/
// Index of the last parsed token by default would be the last token in the $list, because we're
// assuming that all remaining tokens at state 4, are related to the expression.
$idxOfLastParsedToken = $list->count - 1;
// Index before search to be able to restore the index.
$idxBeforeSearch = $list->idx;
// Length of expression tokens is null by default, in order for the $subList to start
// from $list->idx to the end of the $list.
$lengthOfExpressionTokens = null;
if ($list->getNextOfTypeAndValue(Token::TYPE_KEYWORD, 'ON')) {
// (-1) because getNextOfTypeAndValue returned ON and increased the index.
$idxOfOn = $list->idx - 1;
// We want to make sure that it's `ON DUPLICATE KEY UPDATE`
$dubplicateToken = $list->getNext();
$keyToken = $list->getNext();
$updateToken = $list->getNext();
if (
$dubplicateToken && $dubplicateToken->keyword === 'DUPLICATE'
&& ($keyToken && $keyToken->keyword === 'KEY')
&& ($updateToken && $updateToken->keyword === 'UPDATE')
) {
// Index of the last parsed token will be the token before the ON Keyword
$idxOfLastParsedToken = $idxOfOn - 1;
// The length of the expression tokens would be the difference
// between the first unrelated token `ON` and the idx
// before skipping the CTE tokens.
$lengthOfExpressionTokens = $idxOfOn - $idxBeforeSearch;
}
}
// Restore the index
$list->idx = $idxBeforeSearch;
$subList = new TokensList(array_slice($list->tokens, $list->idx, $lengthOfExpressionTokens));
$subParser = new Parser($subList);
if (count($subParser->errors)) {
foreach ($subParser->errors as $error) {
$parser->errors[] = $error;
}
break;
}
$this->cteStatementParser = $subParser;
$list->idx = $idxOfLastParsedToken;
break;
}
}
// 5 is the only valid end state
if ($state !== 5) {
/**
* Token parsed at this moment.
*/
$token = $list->tokens[$list->idx];
$parser->error('Unexpected end of the WITH CTE.', $token);
}
--$list->idx;
}
/**
* {@inheritdoc}
*/
public function build()
{
$str = 'WITH ';
foreach ($this->withers as $wither) {
$str .= $str === 'WITH ' ? '' : ', ';
$str .= WithKeyword::build($wither);
}
$str .= ' ';
if ($this->cteStatementParser) {
foreach ($this->cteStatementParser->statements as $statement) {
$str .= $statement->build();
}
}
return $str;
}
/**
* Get tokens within the WITH expression to use them in another parser
*
* @return ParserException|TokensList
*/
private function getSubTokenList(TokensList $list)
{
$idx = $list->idx;
$token = $list->tokens[$list->idx];
$openParenthesis = 0;
while ($list->idx < $list->count) {
if ($token->value === '(') {
++$openParenthesis;
} elseif ($token->value === ')') {
if (--$openParenthesis === -1) {
break;
}
}
++$list->idx;
if (! isset($list->tokens[$list->idx])) {
break;
}
$token = $list->tokens[$list->idx];
}
// performance improvement: return the error to avoid a try/catch in the loop
if ($list->idx === $list->count) {
--$list->idx;
return new ParserException(
Translator::gettext('A closing bracket was expected.'),
$token
);
}
$length = $list->idx - $idx;
return new TokensList(array_slice($list->tokens, $idx, $length), $length);
}
}
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