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<?php
/**
* Statement utilities.
*/
declare(strict_types=1);
namespace PhpMyAdmin\SqlParser\Utils;
use PhpMyAdmin\SqlParser\Components\Expression;
use PhpMyAdmin\SqlParser\Lexer;
use PhpMyAdmin\SqlParser\Parser;
use PhpMyAdmin\SqlParser\Statement;
use PhpMyAdmin\SqlParser\Statements\AlterStatement;
use PhpMyAdmin\SqlParser\Statements\AnalyzeStatement;
use PhpMyAdmin\SqlParser\Statements\CallStatement;
use PhpMyAdmin\SqlParser\Statements\CheckStatement;
use PhpMyAdmin\SqlParser\Statements\ChecksumStatement;
use PhpMyAdmin\SqlParser\Statements\CreateStatement;
use PhpMyAdmin\SqlParser\Statements\DeleteStatement;
use PhpMyAdmin\SqlParser\Statements\DropStatement;
use PhpMyAdmin\SqlParser\Statements\ExplainStatement;
use PhpMyAdmin\SqlParser\Statements\InsertStatement;
use PhpMyAdmin\SqlParser\Statements\LoadStatement;
use PhpMyAdmin\SqlParser\Statements\OptimizeStatement;
use PhpMyAdmin\SqlParser\Statements\RenameStatement;
use PhpMyAdmin\SqlParser\Statements\RepairStatement;
use PhpMyAdmin\SqlParser\Statements\ReplaceStatement;
use PhpMyAdmin\SqlParser\Statements\SelectStatement;
use PhpMyAdmin\SqlParser\Statements\SetStatement;
use PhpMyAdmin\SqlParser\Statements\ShowStatement;
use PhpMyAdmin\SqlParser\Statements\TruncateStatement;
use PhpMyAdmin\SqlParser\Statements\UpdateStatement;
use PhpMyAdmin\SqlParser\Token;
use PhpMyAdmin\SqlParser\TokensList;
use function array_flip;
use function array_keys;
use function count;
use function in_array;
use function is_string;
use function trim;
/**
* Statement utilities.
*/
class Query
{
/**
* Functions that set the flag `is_func`.
*
* @var string[]
*/
public static $FUNCTIONS = [
'SUM',
'AVG',
'STD',
'STDDEV',
'MIN',
'MAX',
'BIT_OR',
'BIT_AND',
];
/** @var array<string,false> */
public static $ALLFLAGS = [
/*
* select ... DISTINCT ...
*/
'distinct' => false,
/*
* drop ... DATABASE ...
*/
'drop_database' => false,
/*
* ... GROUP BY ...
*/
'group' => false,
/*
* ... HAVING ...
*/
'having' => false,
/*
* INSERT ...
* or
* REPLACE ...
* or
* DELETE ...
*/
'is_affected' => false,
/*
* select ... PROCEDURE ANALYSE( ... ) ...
*/
'is_analyse' => false,
/*
* select COUNT( ... ) ...
*/
'is_count' => false,
/*
* DELETE ...
*/
'is_delete' => false, // @deprecated; use `querytype`
/*
* EXPLAIN ...
*/
'is_explain' => false, // @deprecated; use `querytype`
/*
* select ... INTO OUTFILE ...
*/
'is_export' => false,
/*
* select FUNC( ... ) ...
*/
'is_func' => false,
/*
* select ... GROUP BY ...
* or
* select ... HAVING ...
*/
'is_group' => false,
/*
* INSERT ...
* or
* REPLACE ...
* or
* LOAD DATA ...
*/
'is_insert' => false,
/*
* ANALYZE ...
* or
* CHECK ...
* or
* CHECKSUM ...
* or
* OPTIMIZE ...
* or
* REPAIR ...
*/
'is_maint' => false,
/*
* CALL ...
*/
'is_procedure' => false,
/*
* REPLACE ...
*/
'is_replace' => false, // @deprecated; use `querytype`
/*
* SELECT ...
*/
'is_select' => false, // @deprecated; use `querytype`
/*
* SHOW ...
*/
'is_show' => false, // @deprecated; use `querytype`
/*
* Contains a subquery.
*/
'is_subquery' => false,
/*
* ... JOIN ...
*/
'join' => false,
/*
* ... LIMIT ...
*/
'limit' => false,
/*
* TODO
*/
'offset' => false,
/*
* ... ORDER ...
*/
'order' => false,
/*
* The type of the query (which is usually the first keyword of
* the statement).
*/
'querytype' => false,
/*
* Whether a page reload is required.
*/
'reload' => false,
/*
* SELECT ... FROM ...
*/
'select_from' => false,
/*
* ... UNION ...
*/
'union' => false,
];
/**
* Gets an array with flags select statement has.
*
* @param SelectStatement $statement the statement to be processed
* @param array $flags flags set so far
*
* @return array
*/
private static function getFlagsSelect($statement, $flags)
{
$flags['querytype'] = 'SELECT';
$flags['is_select'] = true;
if (! empty($statement->from)) {
$flags['select_from'] = true;
}
if ($statement->options->has('DISTINCT')) {
$flags['distinct'] = true;
}
if (! empty($statement->group) || ! empty($statement->having)) {
$flags['is_group'] = true;
}
if (! empty($statement->into) && ($statement->into->type === 'OUTFILE')) {
$flags['is_export'] = true;
}
$expressions = $statement->expr;
if (! empty($statement->join)) {
foreach ($statement->join as $join) {
$expressions[] = $join->expr;
}
}
foreach ($expressions as $expr) {
if (! empty($expr->function)) {
if ($expr->function === 'COUNT') {
$flags['is_count'] = true;
} elseif (in_array($expr->function, static::$FUNCTIONS)) {
$flags['is_func'] = true;
}
}
if (empty($expr->subquery)) {
continue;
}
$flags['is_subquery'] = true;
}
if (! empty($statement->procedure) && ($statement->procedure->name === 'ANALYSE')) {
$flags['is_analyse'] = true;
}
if (! empty($statement->group)) {
$flags['group'] = true;
}
if (! empty($statement->having)) {
$flags['having'] = true;
}
if (! empty($statement->union)) {
$flags['union'] = true;
}
if (! empty($statement->join)) {
$flags['join'] = true;
}
return $flags;
}
/**
* Gets an array with flags this statement has.
*
* @param Statement|null $statement the statement to be processed
* @param bool $all if `false`, false values will not be included
*
* @return array
*/
public static function getFlags($statement, $all = false)
{
$flags = ['querytype' => false];
if ($all) {
$flags = self::$ALLFLAGS;
}
if ($statement instanceof AlterStatement) {
$flags['querytype'] = 'ALTER';
$flags['reload'] = true;
} elseif ($statement instanceof CreateStatement) {
$flags['querytype'] = 'CREATE';
$flags['reload'] = true;
} elseif ($statement instanceof AnalyzeStatement) {
$flags['querytype'] = 'ANALYZE';
$flags['is_maint'] = true;
} elseif ($statement instanceof CheckStatement) {
$flags['querytype'] = 'CHECK';
$flags['is_maint'] = true;
} elseif ($statement instanceof ChecksumStatement) {
$flags['querytype'] = 'CHECKSUM';
$flags['is_maint'] = true;
} elseif ($statement instanceof OptimizeStatement) {
$flags['querytype'] = 'OPTIMIZE';
$flags['is_maint'] = true;
} elseif ($statement instanceof RepairStatement) {
$flags['querytype'] = 'REPAIR';
$flags['is_maint'] = true;
} elseif ($statement instanceof CallStatement) {
$flags['querytype'] = 'CALL';
$flags['is_procedure'] = true;
} elseif ($statement instanceof DeleteStatement) {
$flags['querytype'] = 'DELETE';
$flags['is_delete'] = true;
$flags['is_affected'] = true;
} elseif ($statement instanceof DropStatement) {
$flags['querytype'] = 'DROP';
$flags['reload'] = true;
if ($statement->options->has('DATABASE') || $statement->options->has('SCHEMA')) {
$flags['drop_database'] = true;
}
} elseif ($statement instanceof ExplainStatement) {
$flags['querytype'] = 'EXPLAIN';
$flags['is_explain'] = true;
} elseif ($statement instanceof InsertStatement) {
$flags['querytype'] = 'INSERT';
$flags['is_affected'] = true;
$flags['is_insert'] = true;
} elseif ($statement instanceof LoadStatement) {
$flags['querytype'] = 'LOAD';
$flags['is_affected'] = true;
$flags['is_insert'] = true;
} elseif ($statement instanceof ReplaceStatement) {
$flags['querytype'] = 'REPLACE';
$flags['is_affected'] = true;
$flags['is_replace'] = true;
$flags['is_insert'] = true;
} elseif ($statement instanceof SelectStatement) {
$flags = self::getFlagsSelect($statement, $flags);
} elseif ($statement instanceof ShowStatement) {
$flags['querytype'] = 'SHOW';
$flags['is_show'] = true;
} elseif ($statement instanceof UpdateStatement) {
$flags['querytype'] = 'UPDATE';
$flags['is_affected'] = true;
} elseif ($statement instanceof SetStatement) {
$flags['querytype'] = 'SET';
}
if (
($statement instanceof SelectStatement)
|| ($statement instanceof UpdateStatement)
|| ($statement instanceof DeleteStatement)
) {
if (! empty($statement->limit)) {
$flags['limit'] = true;
}
if (! empty($statement->order)) {
$flags['order'] = true;
}
}
return $flags;
}
/**
* Parses a query and gets all information about it.
*
* @param string $query the query to be parsed
*
* @return array The array returned is the one returned by
* `static::getFlags()`, with the following keys added:
* - parser - the parser used to analyze the query;
* - statement - the first statement resulted from parsing;
* - select_tables - the real name of the tables selected;
* if there are no table names in the `SELECT`
* expressions, the table names are fetched from the
* `FROM` expressions
* - select_expr - selected expressions
*/
public static function getAll($query)
{
$parser = new Parser($query);
if (empty($parser->statements[0])) {
return static::getFlags(null, true);
}
$statement = $parser->statements[0];
$ret = static::getFlags($statement, true);
$ret['parser'] = $parser;
$ret['statement'] = $statement;
if ($statement instanceof SelectStatement) {
$ret['select_tables'] = [];
$ret['select_expr'] = [];
// Finding tables' aliases and their associated real names.
$tableAliases = [];
foreach ($statement->from as $expr) {
if (! isset($expr->table, $expr->alias) || ($expr->table === '') || ($expr->alias === '')) {
continue;
}
$tableAliases[$expr->alias] = [
$expr->table,
$expr->database ?? null,
];
}
// Trying to find selected tables only from the select expression.
// Sometimes, this is not possible because the tables aren't defined
// explicitly (e.g. SELECT * FROM film, SELECT film_id FROM film).
foreach ($statement->expr as $expr) {
if (isset($expr->table) && ($expr->table !== '')) {
if (isset($tableAliases[$expr->table])) {
$arr = $tableAliases[$expr->table];
} else {
$arr = [
$expr->table,
isset($expr->database) && ($expr->database !== '') ?
$expr->database : null,
];
}
if (! in_array($arr, $ret['select_tables'])) {
$ret['select_tables'][] = $arr;
}
} else {
$ret['select_expr'][] = $expr->expr;
}
}
// If no tables names were found in the SELECT clause or if there
// are expressions like * or COUNT(*), etc. tables names should be
// extracted from the FROM clause.
if (empty($ret['select_tables'])) {
foreach ($statement->from as $expr) {
if (! isset($expr->table) || ($expr->table === '')) {
continue;
}
$arr = [
$expr->table,
isset($expr->database) && ($expr->database !== '') ?
$expr->database : null,
];
if (in_array($arr, $ret['select_tables'])) {
continue;
}
$ret['select_tables'][] = $arr;
}
}
}
return $ret;
}
/**
* Gets a list of all tables used in this statement.
*
* @param Statement $statement statement to be scanned
*
* @return array
*/
public static function getTables($statement)
{
$expressions = [];
if (($statement instanceof InsertStatement) || ($statement instanceof ReplaceStatement)) {
$expressions = [$statement->into->dest];
} elseif ($statement instanceof UpdateStatement) {
$expressions = $statement->tables;
} elseif (($statement instanceof SelectStatement) || ($statement instanceof DeleteStatement)) {
$expressions = $statement->from;
} elseif (($statement instanceof AlterStatement) || ($statement instanceof TruncateStatement)) {
$expressions = [$statement->table];
} elseif ($statement instanceof DropStatement) {
if (! $statement->options->has('TABLE')) {
// No tables are dropped.
return [];
}
$expressions = $statement->fields;
} elseif ($statement instanceof RenameStatement) {
foreach ($statement->renames as $rename) {
$expressions[] = $rename->old;
}
}
$ret = [];
foreach ($expressions as $expr) {
if (empty($expr->table)) {
continue;
}
$expr->expr = null; // Force rebuild.
$expr->alias = null; // Aliases are not required.
$ret[] = Expression::build($expr);
}
return $ret;
}
/**
* Gets a specific clause.
*
* @param Statement $statement the parsed query that has to be modified
* @param TokensList $list the list of tokens
* @param string $clause the clause to be returned
* @param int|string $type The type of the search.
* If int,
* -1 for everything that was before
* 0 only for the clause
* 1 for everything after
* If string, the name of the first clause that
* should not be included.
* @param bool $skipFirst whether to skip the first keyword in clause
*
* @return string
*/
public static function getClause($statement, $list, $clause, $type = 0, $skipFirst = true)
{
/**
* The index of the current clause.
*
* @var int
*/
$currIdx = 0;
/**
* The count of brackets.
* We keep track of them so we won't insert the clause in a subquery.
*
* @var int
*/
$brackets = 0;
/**
* The string to be returned.
*
* @var string
*/
$ret = '';
/**
* The clauses of this type of statement and their index.
*
* @var array
*/
$clauses = array_flip(array_keys($statement->getClauses()));
/**
* Lexer used for lexing the clause.
*
* @var Lexer
*/
$lexer = new Lexer($clause);
/**
* The type of this clause.
*
* @var string
*/
$clauseType = $lexer->list->getNextOfType(Token::TYPE_KEYWORD)->keyword;
/**
* The index of this clause.
*
* @var int
*/
$clauseIdx = $clauses[$clauseType] ?? -1;
$firstClauseIdx = $clauseIdx;
$lastClauseIdx = $clauseIdx;
// Determining the behavior of this function.
if ($type === -1) {
$firstClauseIdx = -1; // Something small enough.
$lastClauseIdx = $clauseIdx - 1;
} elseif ($type === 1) {
$firstClauseIdx = $clauseIdx + 1;
$lastClauseIdx = 10000; // Something big enough.
} elseif (is_string($type) && isset($clauses[$type])) {
if ($clauses[$type] > $clauseIdx) {
$firstClauseIdx = $clauseIdx + 1;
$lastClauseIdx = $clauses[$type] - 1;
} else {
$firstClauseIdx = $clauses[$type] + 1;
$lastClauseIdx = $clauseIdx - 1;
}
}
// This option is unavailable for multiple clauses.
if ($type !== 0) {
$skipFirst = false;
}
for ($i = $statement->first; $i <= $statement->last; ++$i) {
$token = $list->tokens[$i];
if ($token->type === Token::TYPE_COMMENT) {
continue;
}
if ($token->type === Token::TYPE_OPERATOR) {
if ($token->value === '(') {
++$brackets;
} elseif ($token->value === ')') {
--$brackets;
}
}
if ($brackets === 0) {
// Checking if the section was changed.
if (
($token->type === Token::TYPE_KEYWORD)
&& isset($clauses[$token->keyword])
&& ($clauses[$token->keyword] >= $currIdx)
) {
$currIdx = $clauses[$token->keyword];
if ($skipFirst && ($currIdx === $clauseIdx)) {
// This token is skipped (not added to the old
// clause) because it will be replaced.
continue;
}
}
}
if (($firstClauseIdx > $currIdx) || ($currIdx > $lastClauseIdx)) {
continue;
}
$ret .= $token->token;
}
return trim($ret);
}
/**
* Builds a query by rebuilding the statement from the tokens list supplied
* and replaces a clause.
*
* It is a very basic version of a query builder.
*
* @param Statement $statement the parsed query that has to be modified
* @param TokensList $list the list of tokens
* @param string $old The type of the clause that should be
* replaced. This can be an entire clause.
* @param string $new The new clause. If this parameter is omitted
* it is considered to be equal with `$old`.
* @param bool $onlyType whether only the type of the clause should
* be replaced or the entire clause
*
* @return string
*/
public static function replaceClause($statement, $list, $old, $new = null, $onlyType = false)
{
// TODO: Update the tokens list and the statement.
if ($new === null) {
$new = $old;
}
if ($onlyType) {
return static::getClause($statement, $list, $old, -1, false) . ' ' .
$new . ' ' . static::getClause($statement, $list, $old, 0) . ' ' .
static::getClause($statement, $list, $old, 1, false);
}
return static::getClause($statement, $list, $old, -1, false) . ' ' .
$new . ' ' . static::getClause($statement, $list, $old, 1, false);
}
/**
* Builds a query by rebuilding the statement from the tokens list supplied
* and replaces multiple clauses.
*
* @param Statement $statement the parsed query that has to be modified
* @param TokensList $list the list of tokens
* @param array $ops Clauses to be replaced. Contains multiple
* arrays having two values: [$old, $new].
* Clauses must be sorted.
*
* @return string
*/
public static function replaceClauses($statement, $list, array $ops)
{
$count = count($ops);
// Nothing to do.
if ($count === 0) {
return '';
}
/**
* Value to be returned.
*
* @var string
*/
$ret = '';
// If there is only one clause, `replaceClause()` should be used.
if ($count === 1) {
return static::replaceClause($statement, $list, $ops[0][0], $ops[0][1]);
}
// Adding everything before first replacement.
$ret .= static::getClause($statement, $list, $ops[0][0], -1) . ' ';
// Doing replacements.
foreach ($ops as $i => $clause) {
$ret .= $clause[1] . ' ';
// Adding everything between this and next replacement.
if ($i + 1 === $count) {
continue;
}
$ret .= static::getClause($statement, $list, $clause[0], $ops[$i + 1][0]) . ' ';
}
// Adding everything after the last replacement.
return $ret . static::getClause($statement, $list, $ops[$count - 1][0], 1);
}
/**
* Gets the first full statement in the query.
*
* @param string $query the query to be analyzed
* @param string $delimiter the delimiter to be used
*
* @return array array containing the first full query, the
* remaining part of the query and the last
* delimiter
*/
public static function getFirstStatement($query, $delimiter = null)
{
$lexer = new Lexer($query, false, $delimiter);
$list = $lexer->list;
/**
* Whether a full statement was found.
*
* @var bool
*/
$fullStatement = false;
/**
* The first full statement.
*
* @var string
*/
$statement = '';
for ($list->idx = 0; $list->idx < $list->count; ++$list->idx) {
$token = $list->tokens[$list->idx];
if ($token->type === Token::TYPE_COMMENT) {
continue;
}
$statement .= $token->token;
if (($token->type === Token::TYPE_DELIMITER) && ! empty($token->token)) {
$delimiter = $token->token;
$fullStatement = true;
break;
}
}
// No statement was found so we return the entire query as being the
// remaining part.
if (! $fullStatement) {
return [
null,
$query,
$delimiter,
];
}
// At least one query was found so we have to build the rest of the
// remaining query.
$query = '';
for (++$list->idx; $list->idx < $list->count; ++$list->idx) {
$query .= $list->tokens[$list->idx]->token;
}
return [
trim($statement),
$query,
$delimiter,
];
}
/**
* Gets a starting offset of a specific clause.
*
* @param Statement $statement the parsed query that has to be modified
* @param TokensList $list the list of tokens
* @param string $clause the clause to be returned
*
* @return int
*/
public static function getClauseStartOffset($statement, $list, $clause)
{
/**
* The count of brackets.
* We keep track of them so we won't insert the clause in a subquery.
*
* @var int
*/
$brackets = 0;
/**
* The clauses of this type of statement and their index.
*
* @var array
*/
$clauses = array_flip(array_keys($statement->getClauses()));
for ($i = $statement->first; $i <= $statement->last; ++$i) {
$token = $list->tokens[$i];
if ($token->type === Token::TYPE_COMMENT) {
continue;
}
if ($token->type === Token::TYPE_OPERATOR) {
if ($token->value === '(') {
++$brackets;
} elseif ($token->value === ')') {
--$brackets;
}
}
if ($brackets !== 0) {
continue;
}
if (
($token->type === Token::TYPE_KEYWORD)
&& isset($clauses[$token->keyword])
&& ($clause === $token->keyword)
) {
return $i;
}
if ($token->keyword === 'UNION') {
return -1;
}
}
return -1;
}
}