ClickHouse/dbms/include/DB/Parsers/IParserBase.h
2014-04-06 11:23:42 +04:00

34 lines
648 B
C++

#pragma once
#include <list>
#include <Poco/SharedPtr.h>
#include <DB/Core/Types.h>
#include <DB/Parsers/IParser.h>
#include <iostream>
namespace DB
{
/** Базовый класс для большинства парсеров
*/
class IParserBase : public IParser
{
public:
bool parse(Pos & pos, Pos end, ASTPtr & node, const char *& expected)
{
expected = getName();
bool res = parseImpl(pos, end, node, expected);
if (pos > end)
throw Exception("Logical error: pos > end.", ErrorCodes::LOGICAL_ERROR);
return res;
}
protected:
virtual bool parseImpl(Pos & pos, Pos end, ASTPtr & node, const char *& expected) = 0;
};
}