ClickHouse/dbms/include/DB/Parsers/IParserBase.h

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#ifndef DBMS_PARSERS_IPARSERBASE_H
#define DBMS_PARSERS_IPARSERBASE_H
#include <list>
#include <Poco/SharedPtr.h>
#include <DB/Core/Types.h>
#include <DB/Parsers/IParser.h>
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#include <iostream>
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namespace DB
{
/** Базовый класс для большинства парсеров
*/
class IParserBase : public IParser
{
public:
bool parse(Pos & pos, Pos end, ASTPtr & node, String & expected)
{
expected = getName();
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Pos begin = pos;
bool res = parseImpl(pos, end, node, expected);
if (res)
{
String s(begin, pos - begin);
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//std::cerr << getName() << ": " << s << std::endl;
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}
return res;
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}
protected:
virtual bool parseImpl(Pos & pos, Pos end, ASTPtr & node, String & expected) = 0;
};
}
#endif