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50 lines
1016 B
C++
50 lines
1016 B
C++
#pragma once
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#include <DB/Parsers/IParserBase.h>
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#include <DB/Parsers/ExpressionElementParsers.h>
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#include <DB/Parsers/CommonParsers.h>
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#include <DB/Parsers/ASTIdentifier.h>
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#include <DB/Parsers/ASTUseQuery.h>
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namespace DB
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{
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/** Запрос USE db
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*/
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class ParserUseQuery : public IParserBase
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{
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protected:
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const char * getName() const { return "USE query"; }
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bool parseImpl(Pos & pos, Pos end, ASTPtr & node, Pos & max_parsed_pos, Expected & expected)
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{
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Pos begin = pos;
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ParserWhiteSpaceOrComments ws;
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ParserString s_use("USE", true, true);
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ParserIdentifier name_p;
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ASTPtr database;
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ws.ignore(pos, end);
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if (!s_use.ignore(pos, end, max_parsed_pos, expected))
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return false;
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ws.ignore(pos, end);
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if (!name_p.parse(pos, end, database, max_parsed_pos, expected))
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return false;
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ws.ignore(pos, end);
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auto query = std::make_shared<ASTUseQuery>(StringRange(begin, pos));
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query->database = typeid_cast<ASTIdentifier &>(*database).name;
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node = query;
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return true;
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}
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};
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}
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