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/*
* Copyright (c) 2021, Tim Flynn <trflynn89@pm.me>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/String.h>
#include <AK/StringView.h>
#include <LibSQL/AST.h>
#include <LibSQL/Lexer.h>
#include <LibSQL/Token.h>
namespace SQL {
class Parser {
struct Position {
size_t line { 0 };
size_t column { 0 };
};
struct Error {
String message;
Position position;
String to_string() const
{
return String::formatted("{} (line: {}, column: {})", message, position.line, position.column);
}
};
public:
explicit Parser(Lexer lexer);
NonnullRefPtr<Statement> next_statement();
bool has_errors() const { return m_parser_state.m_errors.size(); }
const Vector<Error>& errors() const { return m_parser_state.m_errors; }
protected:
NonnullRefPtr<Expression> parse_expression(); // Protected for unit testing.
private:
struct ParserState {
explicit ParserState(Lexer);
Lexer m_lexer;
Token m_token;
Vector<Error> m_errors;
};
NonnullRefPtr<CreateTable> parse_create_table_statement();
NonnullRefPtr<DropTable> parse_drop_table_statement();
NonnullRefPtr<Delete> parse_delete_statement();
NonnullRefPtr<Expression> parse_primary_expression();
NonnullRefPtr<Expression> parse_secondary_expression(NonnullRefPtr<Expression> primary);
bool match_secondary_expression() const;
Optional<NonnullRefPtr<Expression>> parse_literal_value_expression();
Optional<NonnullRefPtr<Expression>> parse_column_name_expression();
Optional<NonnullRefPtr<Expression>> parse_unary_operator_expression();
Optional<NonnullRefPtr<Expression>> parse_binary_operator_expression(NonnullRefPtr<Expression> lhs);
Optional<NonnullRefPtr<Expression>> parse_chained_expression();
Optional<NonnullRefPtr<Expression>> parse_cast_expression();
Optional<NonnullRefPtr<Expression>> parse_case_expression();
Optional<NonnullRefPtr<Expression>> parse_collate_expression(NonnullRefPtr<Expression> expression);
Optional<NonnullRefPtr<Expression>> parse_is_expression(NonnullRefPtr<Expression> expression);
Optional<NonnullRefPtr<Expression>> parse_match_expression(NonnullRefPtr<Expression> lhs, bool invert_expression);
Optional<NonnullRefPtr<Expression>> parse_null_expression(NonnullRefPtr<Expression> expression, bool invert_expression);
Optional<NonnullRefPtr<Expression>> parse_between_expression(NonnullRefPtr<Expression> expression, bool invert_expression);
Optional<NonnullRefPtr<Expression>> parse_in_expression(NonnullRefPtr<Expression> expression, bool invert_expression);
NonnullRefPtr<ColumnDefinition> parse_column_definition();
NonnullRefPtr<TypeName> parse_type_name();
NonnullRefPtr<SignedNumber> parse_signed_number();
NonnullRefPtr<CommonTableExpression> parse_common_table_expression();
NonnullRefPtr<QualifiedTableName> parse_qualified_table_name();
NonnullRefPtr<ReturningClause> parse_returning_clause();
Token consume();
Token consume(TokenType type);
bool consume_if(TokenType type);
bool match(TokenType type) const;
void expected(StringView what);
void syntax_error(String message);
Position position() const;
ParserState m_parser_state;
};
}
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