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<?php
namespace SqlParser;
use SqlParser\Exceptions\ParserException;
/**
* Takes multiple tokens (contained in a Lexer instance) as input and builds a
* parse tree.
*
* @category Parser
* @package SqlParser
* @author Dan Ungureanu <udan1107@gmail.com>
* @license http://opensource.org/licenses/GPL-2.0 GNU Public License
*/
class Parser
{
/**
* Array of classes that are used in parsing the SQL statements.
*
* @var array
*/
public static $STATEMENT_PARSERS = array(
// Data Definition Statements.
// https://dev.mysql.com/doc/refman/5.7/en/sql-syntax-data-definition.html
'ALTER' => '',
'CREATE' => 'SqlParser\\Statements\\CreateStatement',
'DROP' => '',
'RENAME' => 'SqlParser\\Statements\\RenameStatement',
'TRUNCATE' => '',
// Data Manipulation Statements.
// https://dev.mysql.com/doc/refman/5.7/en/sql-syntax-data-manipulation.html
'CALL' => 'SqlParser\\Statements\\CallStatement',
'DELETE' => 'SqlParser\\Statements\\DeleteStatement',
'DO' => '',
'HANDLER' => '',
'INSERT' => 'SqlParser\\Statements\\InsertStatement',
'LOAD' => '',
'REPLACE' => 'SqlParser\\Statements\\ReplaceStatement',
'SELECT' => 'SqlParser\\Statements\\SelectStatement',
'UPDATE' => 'SqlParser\\Statements\\UpdateStatement',
// Prepared Statements.
// https://dev.mysql.com/doc/refman/5.7/en/sql-syntax-prepared-statements.html
'PREPARE' => '',
'EXECUTE' => '',
);
/**
* Array of classes that are used in parsing SQL fragments.
*
* @var array
*/
public static $KEYWORD_PARSERS = array(
'CALL' => array(
'class' => 'SqlParser\\Fragments\\CallKeyword',
'field' => 'call',
),
'FROM' => array(
'class' => 'SqlParser\\Fragments\\FromKeyword',
'field' => 'from',
),
'GROUP BY' => array(
'class' => 'SqlParser\\Fragments\\OrderKeyword',
'field' => 'group',
),
'HAVING' => array(
'class' => 'SqlParser\\Fragments\\WhereKeyword',
'field' => 'having',
),
'INTO' => array(
'class' => 'SqlParser\\Fragments\\IntoKeyword',
'field' => 'into',
),
'JOIN' => array(
'class' => 'SqlParser\\Fragments\\JoinKeyword',
'field' => 'join',
),
'LIMIT' => array(
'class' => 'SqlParser\\Fragments\\LimitKeyword',
'field' => 'limit',
),
'ORDER BY' => array(
'class' => 'SqlParser\\Fragments\\OrderKeyword',
'field' => 'order',
),
'PARTITION' => array(
'class' => 'SqlParser\\Fragments\\ArrayFragment',
'field' => 'partition',
),
'RENAME' => array(
'class' => 'SqlParser\\Fragments\\RenameKeyword',
'field' => 'renames',
),
'SET' => array(
'class' => 'SqlParser\\Fragments\\SetKeyword',
'field' => 'set',
),
'SELECT' => array(
'class' => 'SqlParser\\Fragments\\SelectKeyword',
'field' => 'expr',
),
'UPDATE' => array(
'class' => 'SqlParser\\Fragments\\FromKeyword',
'field' => 'from',
),
'VALUE' => array(
'class' => 'SqlParser\\Fragments\\ValuesKeyword',
'field' => 'values',
),
'VALUES' => array(
'class' => 'SqlParser\\Fragments\\ValuesKeyword',
'field' => 'values',
),
'WHERE' => array(
'class' => 'SqlParser\\Fragments\\WhereKeyword',
'field' => 'where',
),
);
/**
* The list of tokens that are parsed.
*
* @var TokensList
*/
public $list;
/**
* Whether errors should throw exceptions or just be stored.
*
* @var bool
*
* @see static::$errors
*/
public $strict = false;
/**
* List of errors that occured during parsing.
*
* Usually, the parsing does not stop once an error occured because that
* error might be misdetected or a partial result (even a bad one) might be
* needed.
*
* @var ParserException[]
*
* @see Parser::error()
*/
public $errors = array();
/**
* List of statements parsed.
*
* @var Statement[]
*/
public $statements = array();
/**
* Constructor.
*
* @param mixed $list The list of tokens to be parsed.
* @param bool $strict Whether strict mode should be enabled or not.
*/
public function __construct($list = null, $strict = false)
{
if ((is_string($list)) || ($list instanceof UtfString)) {
$lexer = new Lexer($list, $strict);
$this->list = $lexer->tokens;
} elseif ($list instanceof TokensList) {
$this->list = $list;
}
$this->strict = $strict;
if ($list !== null) {
$this->parse();
}
}
/**
* Builds the parse trees.
*
* @return void
*/
public function parse()
{
$tokens = &$this->list->tokens;
$count = &$this->list->count;
$last = &$this->list->idx;
for (; $last < $count; ++$last) {
/**
* Token parsed at this moment.
* @var Token
*/
$token = $tokens[$last];
// Statements can start with keywords only.
// Comments, whitespaces, etc. are ignored.
if ($token->type !== Token::TYPE_KEYWORD) {
continue;
}
// Checking if it is a known statement that can be parsed.
if (empty(static::$STATEMENT_PARSERS[$token->value])) {
$this->error(
'Unrecognized statement type "' . $token->value . '".',
$token
);
// TODO: Skip to first delimiter.
continue;
}
/**
* The name of the class that is used for parsing.
* @var string
*/
$class = static::$STATEMENT_PARSERS[$token->value];
/**
* Processed statement.
* @var Statement
*/
$stmt = new $class();
$stmt->parse($this, $this->list);
$this->statements[] = $stmt;
}
}
/**
* Creates a new error log.
*
* @param string $msg The error message.
* @param Token $token The token that produced the error.
* @param int $code The code of the error.
*/
public function error($msg = '', Token $token = null, $code = 0)
{
$error = new ParserException($msg, $token, $code);
if ($this->strict) {
throw $error;
}
$this->errors[] = $error;
}
}
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