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533 lines (486 loc) · 12.5 KB
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<?php // phpcs:disable WordPress.Files.FileName.InvalidClassFileName,Generic.Files.OneObjectStructurePerFile.MultipleFound
class SQLiteTokenFactory {
private static $valid_types = array(
SQLiteToken::TYPE_RAW,
SQLiteToken::TYPE_IDENTIFIER,
SQLiteToken::TYPE_VALUE,
SQLiteToken::TYPE_OPERATOR,
);
private static $valid_operators = array(
'SELECT',
'INSERT',
'UPDATE',
'DELETE',
'FROM',
'WHERE',
'JOIN',
'LEFT',
'RIGHT',
'INNER',
'OUTER',
'ON',
'AS',
'AND',
'OR',
'NOT',
'IN',
'IS',
'NULL',
'GROUP',
'BY',
'ORDER',
'LIMIT',
'OFFSET',
'HAVING',
'UNION',
'ALL',
'DISTINCT',
'WITH',
'EXISTS',
'CASE',
'WHEN',
'THEN',
'ELSE',
'END',
'LIKE',
'BETWEEN',
'INTERVAL',
'IF',
'BEGIN',
'COMMIT',
'ROLLBACK',
'SAVEPOINT',
'RELEASE',
'PRAGMA',
'(',
')',
'+',
'-',
'*',
'/',
'=',
'<>',
'!=',
'<',
'<=',
'>',
'>=',
';',
);
private static $functions = array(
'ABS' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
'AVG' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
'COUNT' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
'MAX' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
'MIN' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
'ROUND' => array(
'argCount' => 2,
'optionalArgs' => 1,
),
'SUM' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
'LENGTH' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
'UPPER' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
'LOWER' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
'COALESCE' => array(
'argCount' => 2,
'optionalArgs' => PHP_INT_MAX,
),
'SUBSTR' => array(
'argCount' => 3,
'optionalArgs' => 1,
),
'REPLACE' => array(
'argCount' => 3,
'optionalArgs' => 0,
),
'TRIM' => array(
'argCount' => 3,
'optionalArgs' => 2,
),
'DATE' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
'TIME' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
'DATETIME' => array(
'argCount' => 2,
'optionalArgs' => 1,
),
'JULIANDAY' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
'STRFTIME' => array(
'argCount' => 2,
'optionalArgs' => 0,
),
'RANDOM' => array(
'argCount' => 0,
'optionalArgs' => 0,
),
'RANDOMBLOB' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
'NULLIF' => array(
'argCount' => 2,
'optionalArgs' => 0,
),
'IFNULL' => array(
'argCount' => 2,
'optionalArgs' => 0,
),
'INSTR' => array(
'argCount' => 2,
'optionalArgs' => 0,
),
'HEX' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
'QUOTE' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
'LIKE' => array(
'argCount' => 2,
'optionalArgs' => 1,
),
'GLOB' => array(
'argCount' => 2,
'optionalArgs' => 0,
),
'CHAR' => array(
'argCount' => 1,
'optionalArgs' => PHP_INT_MAX,
),
'UNICODE' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
'TOTAL' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
'ZEROBLOB' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
'PRINTF' => array(
'argCount' => 2,
'optionalArgs' => PHP_INT_MAX,
),
'LTRIM' => array(
'argCount' => 2,
'optionalArgs' => 1,
),
'RTRIM' => array(
'argCount' => 2,
'optionalArgs' => 1,
),
'BLOB' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
'GROUP_CONCAT' => array(
'argCount' => 1,
'optionalArgs' => 1,
),
'JSON' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
'JSON_ARRAY' => array(
'argCount' => 1,
'optionalArgs' => PHP_INT_MAX,
),
'JSON_OBJECT' => array(
'argCount' => 1,
'optionalArgs' => PHP_INT_MAX,
),
'JSON_QUOTE' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
'JSON_VALID' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
'JSON_ARRAY_LENGTH' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
'JSON_EXTRACT' => array(
'argCount' => 2,
'optionalArgs' => PHP_INT_MAX,
),
'JSON_INSERT' => array(
'argCount' => 2,
'optionalArgs' => PHP_INT_MAX,
),
'JSON_REPLACE' => array(
'argCount' => 2,
'optionalArgs' => PHP_INT_MAX,
),
'JSON_SET' => array(
'argCount' => 2,
'optionalArgs' => PHP_INT_MAX,
),
'JSON_PATCH' => array(
'argCount' => 2,
'optionalArgs' => 0,
),
'JSON_REMOVE' => array(
'argCount' => 1,
'optionalArgs' => PHP_INT_MAX,
),
'JSON_TYPE' => array(
'argCount' => 1,
'optionalArgs' => PHP_INT_MAX,
),
'JSON_DEPTH' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
'JSON_KEYS' => array(
'argCount' => 1,
'optionalArgs' => 1,
),
'JSON_GROUP_ARRAY' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
'JSON_GROUP_OBJECT' => array(
'argCount' => 1,
'optionalArgs' => 0,
),
);
public static function register_function( string $name, int $arg_count, int $optional_args = 0 ): void {
self::$functions[ strtoupper( $name ) ] = array(
'argCount' => $arg_count,
'optionalArgs' => $optional_args,
);
}
public static function raw( string $value ): SQLiteToken {
return self::create( SQLiteToken::TYPE_RAW, $value );
}
public static function identifier( string $value ): SQLiteToken {
return self::create( SQLiteToken::TYPE_IDENTIFIER, $value );
}
public static function value( $value ): SQLiteToken {
return self::create( SQLiteToken::TYPE_VALUE, self::escape_value( $value ) );
}
public static function double_quoted_value( $value ): SQLiteToken {
$value = substr( $value, 1, -1 );
$value = str_replace( '\"', '"', $value );
$value = str_replace( '""', '"', $value );
return self::create( SQLiteToken::TYPE_VALUE, self::escape_value( $value ) );
}
public static function operator( string $value ): SQLiteToken {
$upper_value = strtoupper( $value );
if ( ! in_array( $upper_value, self::$valid_operators, true ) ) {
throw new InvalidArgumentException( "Invalid SQLite operator or keyword: $value" );
}
return self::create( SQLiteToken::TYPE_OPERATOR, $upper_value );
}
public static function create_function( string $name, array $expressions ): Expression {
$upper_name = strtoupper( $name );
if ( ! isset( self::$functions[ $upper_name ] ) ) {
throw new InvalidArgumentException( "Unknown SQLite function: $name" );
}
$function_spec = self::$functions[ $upper_name ];
$min_args = $function_spec['argCount'] - $function_spec['optionalArgs'];
$max_args = $function_spec['argCount'];
if ( count( $expressions ) < $min_args || count( $expressions ) > $max_args ) {
throw new InvalidArgumentException(
"Function $name expects between $min_args and $max_args arguments, " .
count( $expressions ) . ' given.'
);
}
$tokens = array();
$tokens[] = self::raw( $upper_name );
$tokens[] = self::raw( '(' );
foreach ( $expressions as $index => $expression ) {
if ( $index > 0 ) {
$tokens[] = self::raw( ',' );
}
if ( ! $expression instanceof Expression ) {
throw new InvalidArgumentException( 'All arguments must be instances of Expression' );
}
$tokens = array_merge( $tokens, $expression->elements );
}
$tokens[] = self::raw( ')' );
return new SQLiteExpression( $tokens );
}
private static function create( string $type, string $value ): SQLiteToken {
if ( ! in_array( $type, self::$valid_types, true ) ) {
throw new InvalidArgumentException( "Invalid token type: $type" );
}
return new SQLiteToken( $type, $value );
}
private static function escape_value( $value ): string {
if ( is_string( $value ) ) {
// Ensure the string is valid UTF-8, replace invalid characters with an empty string
$value = mb_convert_encoding( $value, 'UTF-8', 'UTF-8' );
// Escape single quotes by doubling them
$value = str_replace( "'", "''", $value );
// Escape backslashes by doubling them
$value = str_replace( '\\', '\\\\', $value );
// Remove null characters
$value = str_replace( "\0", '', $value );
// Return the escaped string enclosed in single quotes
return "'" . $value . "'";
} elseif ( is_int( $value ) || is_float( $value ) ) {
return (string) $value;
} elseif ( is_bool( $value ) ) {
return $value ? '1' : '0';
} elseif ( is_null( $value ) ) {
return 'NULL';
} else {
throw new InvalidArgumentException( 'Unsupported value type: ' . gettype( $value ) );
}
}
}
class SQLiteToken {
const TYPE_RAW = 'TYPE_RAW';
const TYPE_IDENTIFIER = 'TYPE_IDENTIFIER';
const TYPE_VALUE = 'TYPE_VALUE';
const TYPE_OPERATOR = 'TYPE_OPERATOR';
public $type;
public $value;
public function __construct( string $type, $value ) {
$this->type = $type;
$this->value = $value;
}
}
class SQLiteQueryBuilder {
private Expression $expression;
public static function stringify( Expression $expression ) {
return ( new SQLiteQueryBuilder( $expression ) )->build_query();
}
public function __construct( Expression $expression ) {
$this->expression = $expression;
}
public function build_query(): string {
$query_parts = array();
foreach ( $this->expression->get_tokens() as $element ) {
if ( $element instanceof SQLiteToken ) {
$query_parts[] = $this->process_token( $element );
} elseif ( $element instanceof Expression ) {
$query_parts[] = '(' . ( new self( $element ) )->build_query() . ')';
}
}
return implode( ' ', $query_parts );
}
private function process_token( SQLiteToken $token ): string {
switch ( $token->type ) {
case SQLiteToken::TYPE_RAW:
case SQLiteToken::TYPE_OPERATOR:
return $token->value;
case SQLiteToken::TYPE_IDENTIFIER:
return '"' . str_replace( '"', '""', $token->value ) . '"';
case SQLiteToken::TYPE_VALUE:
return $token->value;
default:
throw new InvalidArgumentException( 'Unknown token type: ' . $token->type );
}
}
}
class Expression {
public $elements;
public function __construct( array $elements = array() ) {
$new_elements = array();
$elements = array_filter( $elements, fn( $x ) => $x );
foreach ( $elements as $element ) {
if ( is_object( $element ) && $element instanceof Expression ) {
$new_elements = array_merge( $new_elements, $element->elements );
} else {
$new_elements[] = $element;
}
}
$this->elements = $new_elements;
}
public function get_tokens() {
return $this->elements;
}
public function add_token( SQLiteToken $token ) {
$this->elements[] = $token;
}
public function add_tokens( array $tokens ) {
foreach ( $tokens as $token ) {
$this->add_token( $token );
}
}
public function add_expression( $expression ) {
$this->add_token( $expression );
}
}
class SQLiteExpression extends Expression {}
class MySQLToSQLiteDriver {
private $pdo;
public function __construct( $dsn, $username = null, $password = null, $options = array() ) {
/* phpcs:ignore WordPress.DB.RestrictedClasses.mysql__PDO */
$this->pdo = new PDO( $dsn, $username, $password, $options );
}
public function query( array $mysql_ast ) {
$transformer = new SQLTransformer( $mysql_ast, 'sqlite' );
$expression = $transformer->transform();
if ( null !== $expression ) {
$query_string = (string) $expression;
return $this->pdo->query( $query_string );
} else {
throw new Exception( 'Failed to transform query.' );
}
}
}
// Example usage:
// Sample parsed MySQL AST (Abstract Syntax Tree)
// $ast = [
// 'type' => 'select',
// 'columns' => [
// ['name' => '*', 'type' => 'ALL'],
// ['name' => 'created_at', 'type' => 'DATETIME']
// ],
// 'from' => 'users',
// 'keywords' => ['SELECT', 'FROM'],
// 'options' => ['DISTINCT']
// ];
// try {
// $driver = new MySQLToSQLiteDriver('sqlite::memory:');
// $result = $driver->query($ast);
// foreach ($result as $row) {
// print_r($row);
// }
// } catch (Exception $e) {
// echo $e->getMessage();
// }