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<?php
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 array_key_exists;
use function in_array;
use function is_numeric;
use function is_string;
use function trim;
/**
* Parses an alter operation.
*
* @final
*/
class AlterOperation extends Component
{
/**
* All database options.
*
* @var array<string, int|array<int, int|string>>
* @psalm-var array<string, (positive-int|array{positive-int, ('var'|'var='|'expr'|'expr=')})>
*/
public static $DB_OPTIONS = [
'CHARACTER SET' => [
1,
'var',
],
'CHARSET' => [
1,
'var',
],
'DEFAULT CHARACTER SET' => [
1,
'var',
],
'DEFAULT CHARSET' => [
1,
'var',
],
'UPGRADE' => [
1,
'var',
],
'COLLATE' => [
2,
'var',
],
'DEFAULT COLLATE' => [
2,
'var',
],
];
/**
* All table options.
*
* @var array<string, int|array<int, int|string>>
* @psalm-var array<string, (positive-int|array{positive-int, ('var'|'var='|'expr'|'expr=')})>
*/
public static $TABLE_OPTIONS = [
'ENGINE' => [
1,
'var=',
],
'ALGORITHM' => [
1,
'var=',
],
'AUTO_INCREMENT' => [
1,
'var=',
],
'AVG_ROW_LENGTH' => [
1,
'var',
],
'COALESCE PARTITION' => [
1,
'var',
],
'LOCK' => [
1,
'var=',
],
'MAX_ROWS' => [
1,
'var',
],
'ROW_FORMAT' => [
1,
'var',
],
'COMMENT' => [
1,
'var',
],
'ADD' => 1,
'ALTER' => 1,
'ANALYZE' => 1,
'CHANGE' => 1,
'CHARSET' => 1,
'CHECK' => 1,
'CONVERT' => 1,
'DEFAULT CHARSET' => 1,
'DISABLE' => 1,
'DISCARD' => 1,
'DROP' => 1,
'ENABLE' => 1,
'IMPORT' => 1,
'MODIFY' => 1,
'OPTIMIZE' => 1,
'ORDER' => 1,
'REBUILD' => 1,
'REMOVE' => 1,
'RENAME' => 1,
'REORGANIZE' => 1,
'REPAIR' => 1,
'UPGRADE' => 1,
'COLUMN' => 2,
'CONSTRAINT' => 2,
'DEFAULT' => 2,
'BY' => 2,
'FOREIGN' => 2,
'FULLTEXT' => 2,
'KEY' => 2,
'KEYS' => 2,
'PARTITION' => 2,
'PARTITION BY' => 2,
'PARTITIONING' => 2,
'PRIMARY KEY' => 2,
'SPATIAL' => 2,
'TABLESPACE' => 2,
'INDEX' => [
2,
'var',
],
'CHARACTER SET' => 3,
'TO' => [
3,
'var',
],
];
/**
* All user options.
*
* @var array<string, int|array<int, int|string>>
* @psalm-var array<string, (positive-int|array{positive-int, ('var'|'var='|'expr'|'expr=')})>
*/
public static $USER_OPTIONS = [
'ATTRIBUTE' => [
1,
'var',
],
'COMMENT' => [
1,
'var',
],
'REQUIRE' => [
1,
'var',
],
'IDENTIFIED VIA' => [
2,
'var',
],
'IDENTIFIED WITH' => [
2,
'var',
],
'PASSWORD' => [
2,
'var',
],
'WITH' => [
2,
'var',
],
'BY' => [
4,
'expr',
],
'ACCOUNT' => 1,
'DEFAULT' => 1,
'LOCK' => 2,
'UNLOCK' => 2,
'IDENTIFIED' => 3,
];
/**
* All view options.
*
* @var array<string, int|array<int, int|string>>
* @psalm-var array<string, (positive-int|array{positive-int, ('var'|'var='|'expr'|'expr=')})>
*/
public static $VIEW_OPTIONS = ['AS' => 1];
/**
* All event options.
*
* @var array<string, int|array<int, int|string>>
* @psalm-var array<string, (positive-int|array{positive-int, ('var'|'var='|'expr'|'expr=')})>
*/
public static $EVENT_OPTIONS = [
'ON SCHEDULE' => 1,
'EVERY' => [
2,
'expr',
],
'AT' => [
2,
'expr',
],
'STARTS' => [
3,
'expr',
],
'ENDS' => [
4,
'expr',
],
'ON COMPLETION PRESERVE' => 5,
'ON COMPLETION NOT PRESERVE' => 5,
'RENAME' => 6,
'TO' => [
7,
'expr',
['parseField' => 'table'],
],
'ENABLE' => 8,
'DISABLE' => 8,
'DISABLE ON SLAVE' => 8,
'COMMENT' => [
9,
'var',
],
'DO' => 10,
];
/**
* Options of this operation.
*
* @var OptionsArray
*/
public $options;
/**
* The altered field.
*
* @var Expression|string|null
*/
public $field;
/**
* The partitions.
*
* @var Component[]|ArrayObj|null
*/
public $partitions;
/**
* Unparsed tokens.
*
* @var Token[]|string
*/
public $unknown = [];
/**
* @param OptionsArray $options options of alter operation
* @param Expression|string|null $field altered field
* @param Component[]|ArrayObj|null $partitions partitions definition found in the operation
* @param Token[] $unknown unparsed tokens found at the end of operation
*/
public function __construct(
$options = null,
$field = null,
$partitions = null,
$unknown = []
) {
$this->partitions = $partitions;
$this->options = $options;
$this->field = $field;
$this->unknown = $unknown;
}
/**
* @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 AlterOperation
*/
public static function parse(Parser $parser, TokensList $list, array $options = [])
{
$ret = new static();
/**
* Counts brackets.
*
* @var int
*/
$brackets = 0;
/**
* The state of the parser.
*
* Below are the states of the parser.
*
* 0 ---------------------[ options ]---------------------> 1
*
* 1 ----------------------[ field ]----------------------> 2
*
* 1 -------------[ PARTITION / PARTITION BY ]------------> 3
*
* 2 -------------------------[ , ]-----------------------> 0
*
* @var int
*/
$state = 0;
/**
* partition state.
*
* @var int
*/
$partitionState = 0;
for (; $list->idx < $list->count; ++$list->idx) {
/**
* Token parsed at this moment.
*/
$token = $list->tokens[$list->idx];
// End of statement.
if ($token->type === Token::TYPE_DELIMITER) {
break;
}
// Skipping comments.
if ($token->type === Token::TYPE_COMMENT) {
continue;
}
// Skipping whitespaces.
if ($token->type === Token::TYPE_WHITESPACE) {
if ($state === 2) {
// When parsing the unknown part, the whitespaces are
// included to not break anything.
$ret->unknown[] = $token;
continue;
}
}
if ($state === 0) {
$ret->options = OptionsArray::parse($parser, $list, $options);
// Not only when aliasing but also when parsing the body of an event, we just list the tokens of the
// body in the unknown tokens list, as they define their own statements.
if ($ret->options->has('AS') || $ret->options->has('DO')) {
for (; $list->idx < $list->count; ++$list->idx) {
if ($list->tokens[$list->idx]->type === Token::TYPE_DELIMITER) {
break;
}
$ret->unknown[] = $list->tokens[$list->idx];
}
break;
}
$state = 1;
if ($ret->options->has('PARTITION') || $token->value === 'PARTITION BY') {
$state = 3;
$list->getPrevious(); // in order to check whether it's partition or partition by.
}
} elseif ($state === 1) {
$ret->field = Expression::parse(
$parser,
$list,
[
'breakOnAlias' => true,
'parseField' => 'column',
]
);
if ($ret->field === null) {
// No field was read. We go back one token so the next
// iteration will parse the same token, but in state 2.
--$list->idx;
}
// If the operation is a RENAME COLUMN, now we have detected the field to rename, we need to parse
// again the options to get the new name of the column.
if ($ret->options->has('RENAME') && $ret->options->has('COLUMN')) {
$nextOptions = OptionsArray::parse($parser, $list, $options);
$ret->options->merge($nextOptions);
}
$state = 2;
} elseif ($state === 2) {
if (is_string($token->value) || is_numeric($token->value)) {
$arrayKey = $token->value;
} else {
$arrayKey = $token->token;
}
if ($token->type === Token::TYPE_OPERATOR) {
if ($token->value === '(') {
++$brackets;
} elseif ($token->value === ')') {
--$brackets;
} elseif (($token->value === ',') && ($brackets === 0)) {
break;
}
} elseif (! self::checkIfTokenQuotedSymbol($token)) {
if (! empty(Parser::$STATEMENT_PARSERS[$token->value])) {
$list->idx++; // Ignore the current token
$nextToken = $list->getNext();
if ($token->value === 'SET' && $nextToken !== null && $nextToken->value === '(') {
// To avoid adding the tokens between the SET() parentheses to the unknown tokens
$list->getNextOfTypeAndValue(Token::TYPE_OPERATOR, ')');
} elseif ($token->value === 'SET' && $nextToken !== null && $nextToken->value === 'DEFAULT') {
// to avoid adding the `DEFAULT` token to the unknown tokens.
++$list->idx;
} else {
// We have reached the end of ALTER operation and suddenly found
// a start to new statement, but have not find a delimiter between them
$parser->error(
'A new statement was found, but no delimiter between it and the previous one.',
$token
);
break;
}
} elseif (
(array_key_exists($arrayKey, self::$DB_OPTIONS)
|| array_key_exists($arrayKey, self::$TABLE_OPTIONS))
&& ! self::checkIfColumnDefinitionKeyword($arrayKey)
) {
// This alter operation has finished, which means a comma
// was missing before start of new alter operation
$parser->error('Missing comma before start of a new alter operation.', $token);
break;
}
}
$ret->unknown[] = $token;
} elseif ($state === 3) {
if ($partitionState === 0) {
$list->idx++; // Ignore the current token
$nextToken = $list->getNext();
if (
($token->type === Token::TYPE_KEYWORD)
&& (($token->keyword === 'PARTITION BY')
|| ($token->keyword === 'PARTITION' && $nextToken && $nextToken->value !== '('))
) {
$partitionState = 1;
} elseif (($token->type === Token::TYPE_KEYWORD) && ($token->keyword === 'PARTITION')) {
$partitionState = 2;
}
--$list->idx; // to decrease the idx by one, because the last getNext returned and increased it.
// reverting the effect of the getNext
$list->getPrevious();
$list->getPrevious();
++$list->idx; // to index the idx by one, because the last getPrevious returned and decreased it.
} elseif ($partitionState === 1) {
// Fetch the next token in a way the current index is reset to manage whitespaces in "field".
$currIdx = $list->idx;
++$list->idx;
$nextToken = $list->getNext();
$list->idx = $currIdx;
// Building the expression used for partitioning.
if (empty($ret->field)) {
$ret->field = '';
}
if (
$token->type === Token::TYPE_OPERATOR
&& $token->value === '('
&& $nextToken
&& $nextToken->keyword === 'PARTITION'
) {
$partitionState = 2;
--$list->idx; // Current idx is on "(". We need a step back for ArrayObj::parse incoming.
} else {
$ret->field .= $token->type === Token::TYPE_WHITESPACE ? ' ' : $token->token;
}
} elseif ($partitionState === 2) {
$ret->partitions = ArrayObj::parse(
$parser,
$list,
['type' => PartitionDefinition::class]
);
}
}
}
if ($ret->options->isEmpty()) {
$parser->error('Unrecognized alter operation.', $list->tokens[$list->idx]);
}
--$list->idx;
return $ret;
}
/**
* @param AlterOperation $component the component to be built
* @param array<string, mixed> $options parameters for building
*
* @return string
*/
public static function build($component, array $options = [])
{
// Specific case of RENAME COLUMN that insert the field between 2 options.
$afterFieldsOptions = new OptionsArray();
if ($component->options->has('RENAME') && $component->options->has('COLUMN')) {
$afterFieldsOptions = clone $component->options;
$afterFieldsOptions->remove('RENAME');
$afterFieldsOptions->remove('COLUMN');
$component->options->remove('TO');
}
$ret = $component->options . ' ';
if (isset($component->field) && ($component->field !== '')) {
$ret .= $component->field . ' ';
}
$ret .= $afterFieldsOptions . TokensList::build($component->unknown);
if (isset($component->partitions)) {
$ret .= PartitionDefinition::build($component->partitions);
}
return trim($ret);
}
/**
* Check if token's value is one of the common keywords
* between column and table alteration
*
* @param string $tokenValue Value of current token
*
* @return bool
*/
private static function checkIfColumnDefinitionKeyword($tokenValue)
{
$commonOptions = [
'AUTO_INCREMENT',
'COMMENT',
'DEFAULT',
'CHARACTER SET',
'COLLATE',
'PRIMARY',
'UNIQUE',
'PRIMARY KEY',
'UNIQUE KEY',
];
// Since these options can be used for
// both table as well as a specific column in the table
return in_array($tokenValue, $commonOptions);
}
/**
* Check if token is symbol and quoted with backtick
*
* @param Token $token token to check
*
* @return bool
*/
private static function checkIfTokenQuotedSymbol($token)
{
return $token->type === Token::TYPE_SYMBOL && $token->flags === Token::FLAG_SYMBOL_BACKTICK;
}
}
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