mirror of
https://github.com/ClickHouse/ClickHouse.git
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425 lines
12 KiB
C++
425 lines
12 KiB
C++
#pragma once
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#include <list>
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#include <Parsers/IParserBase.h>
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#include <Parsers/CommonParsers.h>
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namespace DB
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{
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/** Consequent pairs of rows: the operator and the corresponding function. For example, "+" -> "plus".
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* The parsing order of the operators is significant.
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*/
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using Operators_t = const char **;
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/** List of elements separated by something. */
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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, char result_separator_ = ',')
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: elem_parser(std::move(elem_parser_))
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, separator_parser(std::move(separator_parser_))
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, allow_empty(allow_empty_)
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, result_separator(result_separator_)
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{
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}
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protected:
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const char * getName() const override { return "list of elements"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
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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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char result_separator;
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};
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/** An expression with an infix binary left-associative operator.
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* For example, 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_` - allowed operators and their corresponding functions
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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 override { return "list, delimited by binary operators"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
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};
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/** Expression with an infix operator of arbitrary arity.
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* For example, 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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const char * infix;
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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(infix_), 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 override { return "list, delimited by operator of variable arity"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
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};
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/** An expression with a prefix unary operator.
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* Example, 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_` - allowed operators and their corresponding functions
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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 override { return "expression with prefix unary operator"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
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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 override{ return "array element expression"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
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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 override { return "tuple element expression"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
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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 override { return "unary minus expression"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
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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 override { return "multiplicative expression"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override
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{
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return operator_parser.parse(pos, node, expected);
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}
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};
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/// DATE operator. "DATE '2001-01-01'" would be parsed as "toDate('2001-01-01')".
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class ParserDateOperatorExpression : public IParserBase
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{
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protected:
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ParserMultiplicativeExpression next_parser;
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const char * getName() const override { return "DATE operator expression"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
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};
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/// TIMESTAMP operator. "TIMESTAMP '2001-01-01 12:34:56'" would be parsed as "toDateTime('2001-01-01 12:34:56')".
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class ParserTimestampOperatorExpression : public IParserBase
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{
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protected:
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ParserDateOperatorExpression next_parser;
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const char * getName() const override { return "TIMESTAMP operator expression"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
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};
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/// Optional conversion to INTERVAL data type. Example: "INTERVAL x SECOND" parsed as "toIntervalSecond(x)".
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class ParserIntervalOperatorExpression : public IParserBase
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{
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protected:
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ParserTimestampOperatorExpression next_parser;
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const char * getName() const override { return "INTERVAL operator expression"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
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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<ParserIntervalOperatorExpression>()};
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protected:
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const char * getName() const override { return "additive expression"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override
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{
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return operator_parser.parse(pos, node, 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 override { return "string concatenation expression"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override
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{
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return operator_parser.parse(pos, node, 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 override { return "BETWEEN expression"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
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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 override{ return "comparison expression"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override
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{
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return operator_parser.parse(pos, node, 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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private:
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ParserComparisonExpression elem_parser;
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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, ASTPtr & node, 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 override{ return "logical-NOT expression"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override
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{
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return operator_parser.parse(pos, node, 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 override { return "logical-AND expression"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override
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{
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return operator_parser.parse(pos, node, 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 override { return "logical-OR expression"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override
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{
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return operator_parser.parse(pos, node, 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 override { return "expression with ternary operator"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
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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 override { return "lambda expression"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
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};
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using ParserExpression = ParserLambdaExpression;
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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 override { return "expression with optional alias"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override
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{
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return impl->parse(pos, node, expected);
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}
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};
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/** A comma-separated list of expressions, probably empty. */
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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 override { return "list of expressions"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
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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 override { return "not empty list of expressions"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
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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 override { return "order by expression"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
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};
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/// Parser for key-value pair, where value can be list of pairs.
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class ParserKeyValuePair : public IParserBase
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{
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protected:
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const char * getName() const override { return "key-value pair"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
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};
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/// Parser for list of key-value pairs.
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class ParserKeyValuePairsList : public IParserBase
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{
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protected:
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const char * getName() const override { return "list of pairs"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
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};
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class ParserTTLExpressionList : public IParserBase
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{
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protected:
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const char * getName() const override { return "ttl expression"; }
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bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
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};
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}
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