public function __construct(Dialect $aDialect = null)
{
$this->aDialect = $aDialect ?: Dialect::singleton();
// 运算符
foreach ($this->aDialect->operators() as $sOperator) {
$this->arrOperators[strlen($sOperator)][] = $sOperator;
}
krsort($this->arrOperators);
// comment
foreach ($this->aDialect->comments() as $sBegin => $sEnd) {
$this->arrComments[strlen($sBegin)][$sBegin] = $sEnd;
}
krsort($this->arrComments);
}
/**
* @return AbstractParser
*/
public function create($bShare = true, Dialect $aDialect = null, $sAction = 'statement')
{
if ($bShare and isset($this->arrShareParsers[$sAction])) {
return $this->arrShareParsers[$sAction];
}
if (!$aDialect) {
$aDialect = Dialect::singleton();
}
switch ($sAction) {
case 'statement':
$aParser = self::createParserInstace('AbstractParser', $aDialect)->addChildState($this->create($bShare, $aDialect, 'insert'))->addChildState($this->create($bShare, $aDialect, 'replace'))->addChildState($this->create($bShare, $aDialect, 'delete'))->addChildState($this->create($bShare, $aDialect, 'update'))->addChildState($this->create($bShare, $aDialect, 'select'))->addChildState($this->create($bShare, $aDialect, 'create'))->addChildState($this->create($bShare, $aDialect, 'drop'))->addChildState($this->create($bShare, $aDialect, 'from'))->addChildState($this->create($bShare, $aDialect, 'where'))->addChildState($this->create($bShare, $aDialect, 'group'))->addChildState($this->create($bShare, $aDialect, 'order'))->addChildState($this->create($bShare, $aDialect, 'limit'))->addChildState($this->create($bShare, $aDialect, 'set'))->addChildState($this->create($bShare, $aDialect, 'values'))->addChildState($this->create($bShare, $aDialect, 'table-keyword'));
break;
case 'select':
$aParser = self::createParserInstace('ClauseParser', $aDialect, 'select')->addChildState($this->create($bShare, $aDialect, 'function'))->addChildState($this->create($bShare, $aDialect, 'column'));
break;
case 'replace':
case 'insert':
$aParser = self::createParserInstace('ClauseParser', $aDialect, 'insert')->addChildState($this->create($bShare, $aDialect, 'into'))->addChildState($this->create($bShare, $aDialect, 'column'))->addChildState($this->create($bShare, $aDialect, 'values'));
break;
case 'update':
$aParser = self::createParserInstace('ClauseParser', $aDialect, 'update');
break;
case 'delete':
$aParser = self::createParserInstace('ClauseParser', $aDialect, 'delete')->addChildState($this->create($bShare, $aDialect, 'from'));
break;
case 'into':
$aParser = self::createParserInstace('IntoParser', $aDialect)->addChildState($this->create($bShare, $aDialect, 'table'));
break;
case 'from':
$aParser = self::createParserInstace('ClauseParser', $aDialect, 'from')->addChildState($this->create($bShare, $aDialect, 'subquery'))->addChildState($this->create($bShare, $aDialect, 'table'))->addChildState($this->create($bShare, $aDialect, 'join'));
break;
case 'join':
$aParser = self::createParserInstace('TableJoinParser', $aDialect)->addChildState($this->create($bShare, $aDialect, 'table'))->addChildState($this->create($bShare, $aDialect, 'on'))->addChildState($this->create($bShare, $aDialect, 'using'));
break;
case 'using':
$aParser = self::createParserInstace('ClauseParser', $aDialect, 'using')->addChildState($this->create($bShare, $aDialect, 'column'));
break;
case 'on':
case 'where':
$aParser = self::createParserInstace('ClauseParser', $aDialect, $sAction)->addChildState($this->create($bShare, $aDialect, 'function'))->addChildState($this->create($bShare, $aDialect, 'column'));
break;
case 'group':
$aParser = self::createParserInstace('ClauseParser', $aDialect, 'group')->addChildState($this->create($bShare, $aDialect, 'column'));
break;
case 'order':
$aParser = self::createParserInstace('ClauseParser', $aDialect, 'order')->addChildState($this->create($bShare, $aDialect, 'column'));
break;
case 'limit':
$aParser = self::createParserInstace('ClauseParser', $aDialect, 'limit');
break;
case 'set':
$aParser = self::createParserInstace('SetParser', $aDialect)->addChildState($this->create($bShare, $aDialect, 'function'))->addChildState($this->create($bShare, $aDialect, 'column'));
break;
case 'values':
$aParser = self::createParserInstace('ValuesParser', $aDialect)->addChildState($this->create($bShare, $aDialect, 'function'))->addChildState($this->create($bShare, $aDialect, 'column'))->addChildState($this->create($bShare, $aDialect, 'subquery'));
break;
case 'column':
$aParser = self::createParserInstace('ColumnParser', $aDialect);
break;
case 'table':
$aParser = self::createParserInstace('TableParser', $aDialect);
break;
case 'table-keyword':
$aParser = self::createParserInstace('TableKeywordParser', $aDialect);
break;
case 'subquery':
$aParser = self::createParserInstace('SubQueryParser', $aDialect);
break;
case 'function':
$aParser = self::createParserInstace('FunctionParser', $aDialect);
break;
case 'create':
$aParser = self::createParserInstace('ClauseParser', $aDialect, 'create')->addChildState($this->create($bShare, $aDialect, 'table-keyword'));
break;
case 'drop':
$aParser = self::createParserInstace('ClauseParser', $aDialect, 'drop')->addChildState($this->create($bShare, $aDialect, 'table-keyword'));
break;
}
if ($bShare) {
$this->arrShareParsers[$sAction] = $aParser;
}
return $aParser;
}