2014-03-10 12:25:37 +00:00
|
|
|
#pragma once
|
2010-06-24 19:12:10 +00:00
|
|
|
|
2017-04-01 09:19:00 +00:00
|
|
|
#include <Parsers/IParser.h>
|
2010-06-24 19:12:10 +00:00
|
|
|
|
|
|
|
|
|
|
|
namespace DB
|
|
|
|
{
|
|
|
|
|
2017-05-27 17:29:55 +00:00
|
|
|
/** Base class for most parsers
|
2010-06-24 19:12:10 +00:00
|
|
|
*/
|
|
|
|
class IParserBase : public IParser
|
|
|
|
{
|
|
|
|
public:
|
2019-12-01 22:01:05 +00:00
|
|
|
template <typename F>
|
|
|
|
static bool wrapParseImpl(Pos & pos, const F & func)
|
|
|
|
{
|
|
|
|
Pos begin = pos;
|
|
|
|
bool res = func();
|
|
|
|
if (!res)
|
|
|
|
pos = begin;
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
|
|
|
struct IncreaseDepthTag {};
|
|
|
|
|
|
|
|
template <typename F>
|
|
|
|
static bool wrapParseImpl(Pos & pos, IncreaseDepthTag, const F & func)
|
|
|
|
{
|
|
|
|
Pos begin = pos;
|
|
|
|
pos.increaseDepth();
|
|
|
|
bool res = func();
|
|
|
|
pos.decreaseDepth();
|
|
|
|
if (!res)
|
|
|
|
pos = begin;
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
2020-01-21 08:54:26 +00:00
|
|
|
bool parse(Pos & pos, ASTPtr & node, Expected & expected) override;
|
2015-04-11 04:15:14 +00:00
|
|
|
|
2010-06-24 19:12:10 +00:00
|
|
|
protected:
|
2017-07-10 03:28:12 +00:00
|
|
|
virtual bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) = 0;
|
2010-06-24 19:12:10 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
}
|