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https://github.com/RGBCube/serenity
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LibSQL: Parse most language expressions
https://sqlite.org/lang_expr.html The entry point to using expressions, parse_expression(), is not used by SQL::Parser in this commit. But there's so much here that it's easier to grok as its own commit.
This commit is contained in:
Timothy Flynn
Andreas Kling
parent
8c8d611fb3
commit
ce6c7ae18a
5 changed files with 1414 additions and 5 deletions
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@ -25,6 +25,7 @@
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*/
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#include "Parser.h"
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#include <AK/TypeCasts.h>
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namespace SQL {
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@ -124,6 +125,449 @@ NonnullRefPtr<DropTable> Parser::parse_drop_table_statement()
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return create_ast_node<DropTable>(move(schema_name), move(table_name), is_error_if_table_does_not_exist);
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}
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NonnullRefPtr<Expression> Parser::parse_expression()
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{
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// https://sqlite.org/lang_expr.html
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auto expression = parse_primary_expression();
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if (match_secondary_expression())
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expression = parse_secondary_expression(move(expression));
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// FIXME: Parse 'bind-parameter'.
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// FIXME: Parse 'function-name'.
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// FIXME: Parse 'exists'.
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// FIXME: Parse 'raise-function'.
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return expression;
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}
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NonnullRefPtr<Expression> Parser::parse_primary_expression()
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{
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if (auto expression = parse_literal_value_expression(); expression.has_value())
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return move(expression.value());
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if (auto expression = parse_column_name_expression(); expression.has_value())
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return move(expression.value());
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if (auto expression = parse_unary_operator_expression(); expression.has_value())
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return move(expression.value());
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if (auto expression = parse_chained_expression(); expression.has_value())
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return move(expression.value());
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if (auto expression = parse_cast_expression(); expression.has_value())
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return move(expression.value());
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if (auto expression = parse_case_expression(); expression.has_value())
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return move(expression.value());
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expected("Primary Expression");
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consume();
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return create_ast_node<ErrorExpression>();
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}
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NonnullRefPtr<Expression> Parser::parse_secondary_expression(NonnullRefPtr<Expression> primary)
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{
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if (auto expression = parse_binary_operator_expression(primary); expression.has_value())
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return move(expression.value());
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if (auto expression = parse_collate_expression(primary); expression.has_value())
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return move(expression.value());
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if (auto expression = parse_is_expression(primary); expression.has_value())
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return move(expression.value());
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bool invert_expression = false;
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if (consume_if(TokenType::Not))
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invert_expression = true;
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if (auto expression = parse_match_expression(primary, invert_expression); expression.has_value())
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return move(expression.value());
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if (auto expression = parse_null_expression(primary, invert_expression); expression.has_value())
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return move(expression.value());
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if (auto expression = parse_between_expression(primary, invert_expression); expression.has_value())
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return move(expression.value());
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if (auto expression = parse_in_expression(primary, invert_expression); expression.has_value())
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return move(expression.value());
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expected("Secondary Expression");
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consume();
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return create_ast_node<ErrorExpression>();
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}
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bool Parser::match_secondary_expression() const
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{
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return match(TokenType::Not)
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|| match(TokenType::DoublePipe)
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|| match(TokenType::Asterisk)
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|| match(TokenType::Divide)
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|| match(TokenType::Modulus)
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|| match(TokenType::Plus)
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|| match(TokenType::Minus)
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|| match(TokenType::ShiftLeft)
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|| match(TokenType::ShiftRight)
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|| match(TokenType::Ampersand)
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|| match(TokenType::Pipe)
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|| match(TokenType::LessThan)
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|| match(TokenType::LessThanEquals)
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|| match(TokenType::GreaterThan)
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|| match(TokenType::GreaterThanEquals)
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|| match(TokenType::Equals)
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|| match(TokenType::EqualsEquals)
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|| match(TokenType::NotEquals1)
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|| match(TokenType::NotEquals2)
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|| match(TokenType::And)
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|| match(TokenType::Or)
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|| match(TokenType::Collate)
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|| match(TokenType::Is)
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|| match(TokenType::Like)
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|| match(TokenType::Glob)
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|| match(TokenType::Match)
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|| match(TokenType::Regexp)
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|| match(TokenType::Isnull)
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|| match(TokenType::Notnull)
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|| match(TokenType::Between)
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|| match(TokenType::In);
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}
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Optional<NonnullRefPtr<Expression>> Parser::parse_literal_value_expression()
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{
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if (match(TokenType::NumericLiteral)) {
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auto value = consume().double_value();
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return create_ast_node<NumericLiteral>(value);
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}
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if (match(TokenType::StringLiteral)) {
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// TODO: Should the surrounding ' ' be removed here?
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auto value = consume().value();
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return create_ast_node<StringLiteral>(value);
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}
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if (match(TokenType::BlobLiteral)) {
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// TODO: Should the surrounding x' ' be removed here?
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auto value = consume().value();
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return create_ast_node<BlobLiteral>(value);
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}
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if (consume_if(TokenType::Null))
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return create_ast_node<NullLiteral>();
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return {};
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}
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Optional<NonnullRefPtr<Expression>> Parser::parse_column_name_expression()
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{
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if (!match(TokenType::Identifier))
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return {};
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String first_identifier = consume(TokenType::Identifier).value();
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String schema_name;
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String table_name;
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String column_name;
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if (consume_if(TokenType::Period)) {
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String second_identifier = consume(TokenType::Identifier).value();
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if (consume_if(TokenType::Period)) {
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schema_name = move(first_identifier);
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table_name = move(second_identifier);
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column_name = consume(TokenType::Identifier).value();
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} else {
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table_name = move(first_identifier);
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column_name = move(second_identifier);
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}
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} else {
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column_name = move(first_identifier);
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}
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return create_ast_node<ColumnNameExpression>(move(schema_name), move(table_name), move(column_name));
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}
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Optional<NonnullRefPtr<Expression>> Parser::parse_unary_operator_expression()
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{
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if (consume_if(TokenType::Minus))
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return create_ast_node<UnaryOperatorExpression>(UnaryOperator::Minus, parse_expression());
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if (consume_if(TokenType::Plus))
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return create_ast_node<UnaryOperatorExpression>(UnaryOperator::Plus, parse_expression());
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if (consume_if(TokenType::Tilde))
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return create_ast_node<UnaryOperatorExpression>(UnaryOperator::BitwiseNot, parse_expression());
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if (consume_if(TokenType::Not))
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return create_ast_node<UnaryOperatorExpression>(UnaryOperator::Not, parse_expression());
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return {};
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}
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Optional<NonnullRefPtr<Expression>> Parser::parse_binary_operator_expression(NonnullRefPtr<Expression> lhs)
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{
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if (consume_if(TokenType::DoublePipe))
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return create_ast_node<BinaryOperatorExpression>(BinaryOperator::Concatenate, move(lhs), parse_expression());
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if (consume_if(TokenType::Asterisk))
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return create_ast_node<BinaryOperatorExpression>(BinaryOperator::Multiplication, move(lhs), parse_expression());
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if (consume_if(TokenType::Divide))
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return create_ast_node<BinaryOperatorExpression>(BinaryOperator::Division, move(lhs), parse_expression());
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if (consume_if(TokenType::Modulus))
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return create_ast_node<BinaryOperatorExpression>(BinaryOperator::Modulo, move(lhs), parse_expression());
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if (consume_if(TokenType::Plus))
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return create_ast_node<BinaryOperatorExpression>(BinaryOperator::Plus, move(lhs), parse_expression());
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if (consume_if(TokenType::Minus))
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return create_ast_node<BinaryOperatorExpression>(BinaryOperator::Minus, move(lhs), parse_expression());
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if (consume_if(TokenType::ShiftLeft))
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return create_ast_node<BinaryOperatorExpression>(BinaryOperator::ShiftLeft, move(lhs), parse_expression());
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if (consume_if(TokenType::ShiftRight))
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return create_ast_node<BinaryOperatorExpression>(BinaryOperator::ShiftRight, move(lhs), parse_expression());
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if (consume_if(TokenType::Ampersand))
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return create_ast_node<BinaryOperatorExpression>(BinaryOperator::BitwiseAnd, move(lhs), parse_expression());
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if (consume_if(TokenType::Pipe))
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return create_ast_node<BinaryOperatorExpression>(BinaryOperator::BitwiseOr, move(lhs), parse_expression());
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if (consume_if(TokenType::LessThan))
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return create_ast_node<BinaryOperatorExpression>(BinaryOperator::LessThan, move(lhs), parse_expression());
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if (consume_if(TokenType::LessThanEquals))
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return create_ast_node<BinaryOperatorExpression>(BinaryOperator::LessThanEquals, move(lhs), parse_expression());
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if (consume_if(TokenType::GreaterThan))
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return create_ast_node<BinaryOperatorExpression>(BinaryOperator::GreaterThan, move(lhs), parse_expression());
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if (consume_if(TokenType::GreaterThanEquals))
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return create_ast_node<BinaryOperatorExpression>(BinaryOperator::GreaterThanEquals, move(lhs), parse_expression());
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if (consume_if(TokenType::Equals) || consume_if(TokenType::EqualsEquals))
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return create_ast_node<BinaryOperatorExpression>(BinaryOperator::Equals, move(lhs), parse_expression());
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if (consume_if(TokenType::NotEquals1) || consume_if(TokenType::NotEquals2))
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return create_ast_node<BinaryOperatorExpression>(BinaryOperator::NotEquals, move(lhs), parse_expression());
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if (consume_if(TokenType::And))
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return create_ast_node<BinaryOperatorExpression>(BinaryOperator::And, move(lhs), parse_expression());
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if (consume_if(TokenType::Or))
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return create_ast_node<BinaryOperatorExpression>(BinaryOperator::Or, move(lhs), parse_expression());
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return {};
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}
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Optional<NonnullRefPtr<Expression>> Parser::parse_chained_expression()
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{
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if (!match(TokenType::ParenOpen))
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return {};
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NonnullRefPtrVector<Expression> expressions;
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consume(TokenType::ParenOpen);
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do {
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expressions.append(parse_expression());
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if (match(TokenType::ParenClose))
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break;
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consume(TokenType::Comma);
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} while (!match(TokenType::Eof));
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consume(TokenType::ParenClose);
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return create_ast_node<ChainedExpression>(move(expressions));
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}
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Optional<NonnullRefPtr<Expression>> Parser::parse_cast_expression()
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{
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if (!match(TokenType::Cast))
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return {};
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consume(TokenType::Cast);
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consume(TokenType::ParenOpen);
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auto expression = parse_expression();
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consume(TokenType::As);
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auto type_name = parse_type_name();
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consume(TokenType::ParenClose);
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return create_ast_node<CastExpression>(move(expression), move(type_name));
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}
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Optional<NonnullRefPtr<Expression>> Parser::parse_case_expression()
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{
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if (!match(TokenType::Case))
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return {};
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consume();
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RefPtr<Expression> case_expression;
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if (!match(TokenType::When)) {
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case_expression = parse_expression();
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}
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Vector<CaseExpression::WhenThenClause> when_then_clauses;
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do {
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consume(TokenType::When);
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auto when = parse_expression();
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consume(TokenType::Then);
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auto then = parse_expression();
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when_then_clauses.append({ move(when), move(then) });
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if (!match(TokenType::When))
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break;
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} while (!match(TokenType::Eof));
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RefPtr<Expression> else_expression;
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if (consume_if(TokenType::Else))
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else_expression = parse_expression();
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consume(TokenType::End);
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return create_ast_node<CaseExpression>(move(case_expression), move(when_then_clauses), move(else_expression));
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}
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Optional<NonnullRefPtr<Expression>> Parser::parse_collate_expression(NonnullRefPtr<Expression> expression)
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{
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if (!match(TokenType::Collate))
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return {};
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consume();
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String collation_name = consume(TokenType::Identifier).value();
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return create_ast_node<CollateExpression>(move(expression), move(collation_name));
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}
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Optional<NonnullRefPtr<Expression>> Parser::parse_is_expression(NonnullRefPtr<Expression> expression)
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{
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if (!match(TokenType::Is))
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return {};
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consume();
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bool invert_expression = false;
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if (match(TokenType::Not)) {
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consume();
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invert_expression = true;
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}
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auto rhs = parse_expression();
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return create_ast_node<IsExpression>(move(expression), move(rhs), invert_expression);
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}
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Optional<NonnullRefPtr<Expression>> Parser::parse_match_expression(NonnullRefPtr<Expression> lhs, bool invert_expression)
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{
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auto parse_escape = [this]() {
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RefPtr<Expression> escape;
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if (consume_if(TokenType::Escape))
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escape = parse_expression();
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return escape;
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};
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if (consume_if(TokenType::Like))
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return create_ast_node<MatchExpression>(MatchOperator::Like, move(lhs), parse_expression(), parse_escape(), invert_expression);
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if (consume_if(TokenType::Glob))
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return create_ast_node<MatchExpression>(MatchOperator::Glob, move(lhs), parse_expression(), parse_escape(), invert_expression);
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if (consume_if(TokenType::Match))
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return create_ast_node<MatchExpression>(MatchOperator::Match, move(lhs), parse_expression(), parse_escape(), invert_expression);
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if (consume_if(TokenType::Regexp))
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return create_ast_node<MatchExpression>(MatchOperator::Regexp, move(lhs), parse_expression(), parse_escape(), invert_expression);
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return {};
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}
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Optional<NonnullRefPtr<Expression>> Parser::parse_null_expression(NonnullRefPtr<Expression> expression, bool invert_expression)
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{
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if (!match(TokenType::Isnull) && !match(TokenType::Notnull) && !(invert_expression && match(TokenType::Null)))
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return {};
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auto type = consume().type();
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invert_expression |= (type == TokenType::Notnull);
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return create_ast_node<NullExpression>(move(expression), invert_expression);
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}
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Optional<NonnullRefPtr<Expression>> Parser::parse_between_expression(NonnullRefPtr<Expression> expression, bool invert_expression)
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{
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if (!match(TokenType::Between))
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return {};
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consume();
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auto nested = parse_expression();
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if (!is<BinaryOperatorExpression>(*nested)) {
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expected("Binary Expression");
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return create_ast_node<ErrorExpression>();
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}
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const auto& binary_expression = static_cast<const BinaryOperatorExpression&>(*nested);
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if (binary_expression.type() != BinaryOperator::And) {
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expected("AND Expression");
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return create_ast_node<ErrorExpression>();
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}
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return create_ast_node<BetweenExpression>(move(expression), binary_expression.lhs(), binary_expression.rhs(), invert_expression);
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}
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Optional<NonnullRefPtr<Expression>> Parser::parse_in_expression(NonnullRefPtr<Expression> expression, bool invert_expression)
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{
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if (!match(TokenType::In))
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return {};
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consume();
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if (consume_if(TokenType::ParenOpen)) {
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if (match(TokenType::Select)) {
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// FIXME: Parse "select-stmt".
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return {};
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}
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// FIXME: Consolidate this with parse_chained_expression(). That method consumes the opening paren as
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// well, and also requires at least one expression (whereas this allows for an empty chain).
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NonnullRefPtrVector<Expression> expressions;
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if (!match(TokenType::ParenClose)) {
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do {
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expressions.append(parse_expression());
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if (match(TokenType::ParenClose))
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break;
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consume(TokenType::Comma);
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} while (!match(TokenType::Eof));
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}
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consume(TokenType::ParenClose);
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auto chain = create_ast_node<ChainedExpression>(move(expressions));
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return create_ast_node<InChainedExpression>(move(expression), move(chain), invert_expression);
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}
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String schema_or_table_name = consume(TokenType::Identifier).value();
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String schema_name;
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String table_name;
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if (consume_if(TokenType::Period)) {
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schema_name = move(schema_or_table_name);
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table_name = consume(TokenType::Identifier).value();
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} else {
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table_name = move(schema_or_table_name);
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}
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if (match(TokenType::ParenOpen)) {
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// FIXME: Parse "table-function".
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return {};
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}
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return create_ast_node<InTableExpression>(move(expression), move(schema_name), move(table_name), invert_expression);
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}
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NonnullRefPtr<ColumnDefinition> Parser::parse_column_definition()
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{
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// https://sqlite.org/syntax/column-def.html
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