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https://github.com/ClickHouse/ClickHouse.git
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133 lines
4.0 KiB
C++
133 lines
4.0 KiB
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/ASTNameTypePair.h>
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#include <DB/Parsers/ASTIdentifier.h>
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#include <DB/Parsers/CommonParsers.h>
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namespace DB
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{
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/** Вложенная таблица. Например, Nested(UInt32 CounterID, FixedString(2) UserAgentMajor)
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*/
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class ParserNestedTable : public IParserBase
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{
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protected:
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const char * getName() const { return "nested table"; }
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bool parseImpl(Pos & pos, Pos end, ASTPtr & node, Expected & expected);
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};
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/** Параметрический тип или Storage. Например:
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* FixedString(10) или
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* Partitioned(Log, ChunkID) или
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* Nested(UInt32 CounterID, FixedString(2) UserAgentMajor)
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* Результат парсинга - ASTFunction с параметрами или без.
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*/
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class ParserIdentifierWithParameters : public IParserBase
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{
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protected:
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const char * getName() const { return "identifier with parameters"; }
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bool parseImpl(Pos & pos, Pos end, ASTPtr & node, Expected & expected);
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};
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/** Тип или Storage, возможно, параметрический. Например, UInt8 или примеры из ParserIdentifierWithParameters
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* Результат парсинга - ASTFunction с параметрами или без.
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*/
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class ParserIdentifierWithOptionalParameters : public IParserBase
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{
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protected:
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const char * getName() const { return "identifier with optional parameters"; }
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bool parseImpl(Pos & pos, Pos end, ASTPtr & node, Expected & expected);
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};
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template <class NameParser>
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class IParserNameTypePair : public IParserBase
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{
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protected:
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const char * getName() const { return "name and type pair"; }
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bool parseImpl(Pos & pos, Pos end, ASTPtr & node, Expected & expected);
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};
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/** Имя и тип через пробел. Например, URL String. */
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typedef IParserNameTypePair<ParserIdentifier> ParserNameTypePair;
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/** Имя и тип через пробел. Имя может содержать точку. Например, Hits.URL String. */
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typedef IParserNameTypePair<ParserCompoundIdentifier> ParserCompoundNameTypePair;
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template <class NameParser>
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bool IParserNameTypePair<NameParser>::parseImpl(Pos & pos, Pos end, ASTPtr & node, Expected & expected)
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{
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NameParser name_parser;
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ParserIdentifierWithOptionalParameters type_parser;
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ParserWhiteSpaceOrComments ws_parser;
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Pos begin = pos;
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ASTPtr name, type;
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if (name_parser.parse(pos, end, name, expected)
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&& ws_parser.ignore(pos, end, expected)
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&& type_parser.parse(pos, end, type, expected))
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{
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ASTNameTypePair * name_type_pair = new ASTNameTypePair(StringRange(begin, pos));
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node = name_type_pair;
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name_type_pair->name = dynamic_cast<ASTIdentifier &>(*name).name;
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name_type_pair->type = type;
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name_type_pair->children.push_back(type);
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return true;
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}
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pos = begin;
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return false;
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}
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/** Список столбцов. */
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class ParserNameTypePairList : public IParserBase
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{
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protected:
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const char * getName() const { return "name and type pair list"; }
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bool parseImpl(Pos & pos, Pos end, ASTPtr & node, Expected & expected);
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};
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/** ENGINE = name. */
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class ParserEngine : public IParserBase
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{
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protected:
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const char * getName() const { return "ENGINE"; }
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bool parseImpl(Pos & pos, Pos end, ASTPtr & node, Expected & expected);
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};
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/** Запрос типа такого:
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* CREATE|ATTACH TABLE [IF NOT EXISTS] [db.]name
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* (
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* name1 type1,
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* name2 type2,
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* ...
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* ) ENGINE = engine
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*
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* Или:
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* CREATE|ATTACH TABLE [IF NOT EXISTS] [db.]name AS [db2.]name2 [ENGINE = engine]
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*
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* Или:
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* CREATE|ATTACH TABLE [IF NOT EXISTS] [db.]name AS ENGINE = engine SELECT ...
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*
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* Или:
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* CREATE|ATTACH DATABASE db
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*
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* Или:
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* CREATE|ATTACH [MATERIALIZED] VIEW [IF NOT EXISTS] [db.]name [ENGINE = engine] [POPULATE] AS SELECT ...
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*/
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class ParserCreateQuery : public IParserBase
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{
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protected:
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const char * getName() const { return "CREATE TABLE or ATTACH TABLE query"; }
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bool parseImpl(Pos & pos, Pos end, ASTPtr & node, Expected & expected);
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};
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}
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