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https://github.com/ClickHouse/ClickHouse.git
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376 lines
11 KiB
C++
376 lines
11 KiB
C++
#pragma once
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#include <list>
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#include <DB/Parsers/IParserBase.h>
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#include <DB/Parsers/CommonParsers.h>
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namespace DB
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{
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/** Идущие подряд пары строк: оператор и соответствующая ему функция. Например, "+" -> "plus".
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* Порядок парсинга операторов имеет значение.
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*/
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using Operators_t = const char **;
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/** Список элементов, разделённых чем-либо. */
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class ParserList : public IParserBase
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{
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public:
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ParserList(ParserPtr && elem_parser_, ParserPtr && separator_parser_, bool allow_empty_ = true)
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: elem_parser(std::move(elem_parser_)), separator_parser(std::move(separator_parser_)), allow_empty(allow_empty_)
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{
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}
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protected:
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const char * getName() const { return "list of elements"; }
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bool parseImpl(Pos & pos, Pos end, ASTPtr & node, Pos & max_parsed_pos, Expected & expected);
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private:
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ParserPtr elem_parser;
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ParserPtr separator_parser;
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bool allow_empty;
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};
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/** Выражение с инфиксным бинарным лево-ассоциативным оператором.
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* Например, a + b - c + d.
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*/
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class ParserLeftAssociativeBinaryOperatorList : public IParserBase
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{
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private:
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Operators_t operators;
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ParserPtr first_elem_parser;
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ParserPtr remaining_elem_parser;
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public:
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/** operators_ - допустимые операторы и соответствующие им функции
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*/
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ParserLeftAssociativeBinaryOperatorList(Operators_t operators_, ParserPtr && first_elem_parser_)
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: operators(operators_), first_elem_parser(std::move(first_elem_parser_))
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{
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}
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ParserLeftAssociativeBinaryOperatorList(Operators_t operators_, ParserPtr && first_elem_parser_,
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ParserPtr && remaining_elem_parser_)
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: operators(operators_), first_elem_parser(std::move(first_elem_parser_)),
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remaining_elem_parser(std::move(remaining_elem_parser_))
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{
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}
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protected:
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const char * getName() const { return "list, delimited by binary operators"; }
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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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/** Выражение с инфиксным оператором произвольной арности.
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* Например, a AND b AND c AND d.
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*/
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class ParserVariableArityOperatorList : public IParserBase
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{
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private:
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ParserString infix_parser;
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const char * function_name;
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ParserPtr elem_parser;
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public:
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ParserVariableArityOperatorList(const char * infix_, const char * function_, ParserPtr && elem_parser_)
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: infix_parser(infix_, true, true), function_name(function_), elem_parser(std::move(elem_parser_))
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{
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}
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protected:
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const char * getName() const { return "list, delimited by operator of variable arity"; }
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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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/** Выражение с префиксным унарным оператором.
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* Например, NOT x.
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*/
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class ParserPrefixUnaryOperatorExpression : public IParserBase
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{
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private:
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Operators_t operators;
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ParserPtr elem_parser;
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public:
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/** operators_ - допустимые операторы и соответствующие им функции
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*/
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ParserPrefixUnaryOperatorExpression(Operators_t operators_, ParserPtr && elem_parser_)
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: operators(operators_), elem_parser(std::move(elem_parser_))
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{
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}
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protected:
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const char * getName() const { return "expression with prefix unary operator"; }
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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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class ParserTupleElementExpression : public IParserBase
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{
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private:
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static const char * operators[];
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protected:
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const char * getName() const { return "tuple element expression"; }
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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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class ParserArrayElementExpression : public IParserBase
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{
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private:
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static const char * operators[];
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protected:
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const char * getName() const { return "array element expression"; }
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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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class ParserUnaryMinusExpression : public IParserBase
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{
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private:
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static const char * operators[];
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ParserPrefixUnaryOperatorExpression operator_parser {operators, std::make_unique<ParserTupleElementExpression>()};
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protected:
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const char * getName() const { return "unary minus expression"; }
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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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class ParserMultiplicativeExpression : public IParserBase
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{
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private:
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static const char * operators[];
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ParserLeftAssociativeBinaryOperatorList operator_parser {operators, std::make_unique<ParserUnaryMinusExpression>()};
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protected:
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const char * getName() const { return "multiplicative expression"; }
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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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return operator_parser.parse(pos, end, node, max_parsed_pos, expected);
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}
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};
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class ParserAdditiveExpression : public IParserBase
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{
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private:
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static const char * operators[];
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ParserLeftAssociativeBinaryOperatorList operator_parser {operators, std::make_unique<ParserMultiplicativeExpression>()};
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protected:
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const char * getName() const { return "additive expression"; }
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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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return operator_parser.parse(pos, end, node, max_parsed_pos, expected);
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}
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};
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class ParserConcatExpression : public IParserBase
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{
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ParserVariableArityOperatorList operator_parser {"||", "concat", std::make_unique<ParserAdditiveExpression>()};
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protected:
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const char * getName() const { return "string concatenation expression"; }
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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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return operator_parser.parse(pos, end, node, max_parsed_pos, expected);
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}
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};
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class ParserBetweenExpression : public IParserBase
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{
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private:
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ParserConcatExpression elem_parser;
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protected:
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const char * getName() const { return "BETWEEN expression"; }
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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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class ParserComparisonExpression : public IParserBase
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{
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private:
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static const char * operators[];
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ParserLeftAssociativeBinaryOperatorList operator_parser {operators, std::make_unique<ParserBetweenExpression>()};
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protected:
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const char * getName() const { return "comparison expression"; }
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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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return operator_parser.parse(pos, end, node, max_parsed_pos, expected);
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}
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};
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/** Parser for nullity checking with IS (NOT) NULL.
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*/
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class ParserNullityChecking : public IParserBase
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{
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protected:
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const char * getName() const override { return "nullity checking"; }
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bool parseImpl(Pos & pos, Pos end, ASTPtr & node, Pos & max_parsed_pos, Expected & expected) override;
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};
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class ParserLogicalNotExpression : public IParserBase
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{
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private:
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static const char * operators[];
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ParserPrefixUnaryOperatorExpression operator_parser {operators, std::make_unique<ParserNullityChecking>()};
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protected:
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const char * getName() const { return "logical-NOT expression"; }
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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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return operator_parser.parse(pos, end, node, max_parsed_pos, expected);
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}
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};
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class ParserLogicalAndExpression : public IParserBase
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{
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private:
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ParserVariableArityOperatorList operator_parser {"AND", "and", std::make_unique<ParserLogicalNotExpression>()};
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protected:
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const char * getName() const { return "logical-AND expression"; }
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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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return operator_parser.parse(pos, end, node, max_parsed_pos, expected);
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}
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};
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class ParserLogicalOrExpression : public IParserBase
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{
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private:
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ParserVariableArityOperatorList operator_parser {"OR", "or", std::make_unique<ParserLogicalAndExpression>()};
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protected:
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const char * getName() const { return "logical-OR expression"; }
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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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return operator_parser.parse(pos, end, node, max_parsed_pos, expected);
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}
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};
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/** An expression with ternary operator.
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* For example, a = 1 ? b + 1 : c * 2.
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*/
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class ParserTernaryOperatorExpression : public IParserBase
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{
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private:
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ParserLogicalOrExpression elem_parser;
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protected:
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const char * getName() const { return "expression with ternary operator"; }
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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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class ParserLambdaExpression : public IParserBase
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{
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private:
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ParserTernaryOperatorExpression elem_parser;
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protected:
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const char * getName() const { return "lambda expression"; }
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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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class ParserExpressionWithOptionalAlias : public IParserBase
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{
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public:
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ParserExpressionWithOptionalAlias(bool allow_alias_without_as_keyword);
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protected:
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ParserPtr impl;
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const char * getName() const { return "expression with optional alias"; }
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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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return impl->parse(pos, end, node, max_parsed_pos, expected);
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}
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};
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class ParserExpressionInCastExpression : public IParserBase
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{
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public:
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ParserExpressionInCastExpression(bool allow_alias_without_as_keyword);
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protected:
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ParserPtr impl;
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const char * getName() const { return "expression in CAST expression"; }
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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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return impl->parse(pos, end, node, max_parsed_pos, expected);
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}
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};
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/** Список выражений, разделённых запятыми, возможно пустой. */
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class ParserExpressionList : public IParserBase
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{
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public:
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ParserExpressionList(bool allow_alias_without_as_keyword_)
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: allow_alias_without_as_keyword(allow_alias_without_as_keyword_) {}
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protected:
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bool allow_alias_without_as_keyword;
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const char * getName() const { return "list of expressions"; }
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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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class ParserNotEmptyExpressionList : public IParserBase
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{
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public:
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ParserNotEmptyExpressionList(bool allow_alias_without_as_keyword)
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: nested_parser(allow_alias_without_as_keyword) {}
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private:
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ParserExpressionList nested_parser;
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protected:
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const char * getName() const { return "not empty list of expressions"; }
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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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class ParserOrderByExpressionList : public IParserBase
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{
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protected:
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const char * getName() const { return "order by expression"; }
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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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}
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