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#pragma once
#include <Parsers/IParserBase.h>
#include <cassert>
namespace DB
{
/** Parse specified keyword such as SELECT or compound keyword such as ORDER BY.
* All case insensitive. Requires word boundary.
* For compound keywords, any whitespace characters and comments could be in the middle.
*/
/// Example: ORDER/* Hello */BY
class ParserKeyword : public IParserBase
{
private:
std::string_view s;
public:
//NOLINTNEXTLINE Want to be able to init ParserKeyword("literal")
constexpr ParserKeyword(std::string_view s_): s(s_) { assert(!s.empty()); }
constexpr const char * getName() const override { return s.data(); }
protected:
bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
};
class ParserToken : public IParserBase
{
private:
TokenType token_type;
public:
ParserToken(TokenType token_type_) : token_type(token_type_) {} /// NOLINT
protected:
const char * getName() const override { return "token"; }
bool parseImpl(Pos & pos, ASTPtr & /*node*/, Expected & expected) override
{
if (pos->type != token_type)
{
expected.add(pos, getTokenName(token_type));
return false;
}
++pos;
return true;
}
};
// Parser always returns true and do nothing.
class ParserNothing : public IParserBase
{
public:
const char * getName() const override { return "nothing"; }
bool parseImpl(Pos & /*pos*/, ASTPtr & /*node*/, Expected & /*expected*/) override { return true; }
};
}
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