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/*
* Copyright (c) 2021, Tim Flynn <trflynn89@pm.me>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/String.h>
#include <AK/StringView.h>
#include <LibSQL/AST.h>
#include <LibSQL/Lexer.h>
#include <LibSQL/Token.h>
namespace SQL {
namespace Limits {
// https://www.sqlite.org/limits.html
constexpr size_t maximum_expression_tree_depth = 1000;
}
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;
size_t m_current_expression_depth { 0 };
};
NonnullRefPtr<Statement> parse_statement();
NonnullRefPtr<Statement> parse_statement_with_expression_list(RefPtr<CommonTableExpressionList>);
NonnullRefPtr<CreateTable> parse_create_table_statement();
NonnullRefPtr<AlterTable> parse_alter_table_statement();
NonnullRefPtr<DropTable> parse_drop_table_statement();
NonnullRefPtr<Insert> parse_insert_statement(RefPtr<CommonTableExpressionList>);
NonnullRefPtr<Update> parse_update_statement(RefPtr<CommonTableExpressionList>);
NonnullRefPtr<Delete> parse_delete_statement(RefPtr<CommonTableExpressionList>);
NonnullRefPtr<Select> parse_select_statement(RefPtr<CommonTableExpressionList>);
RefPtr<CommonTableExpressionList> parse_common_table_expression_list();
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(String with_parsed_identifier = {}, bool with_parsed_period = false);
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_exists_expression(bool invert_expression, TokenType opening_token = TokenType::Exists);
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();
NonnullRefPtr<ResultColumn> parse_result_column();
NonnullRefPtr<TableOrSubquery> parse_table_or_subquery();
NonnullRefPtr<OrderingTerm> parse_ordering_term();
void parse_schema_and_table_name(String& schema_name, String& table_name);
ConflictResolution parse_conflict_resolution();
template<typename ParseCallback>
void parse_comma_separated_list(bool surrounded_by_parentheses, ParseCallback&& parse_callback)
{
if (surrounded_by_parentheses)
consume(TokenType::ParenOpen);
while (!has_errors() && !match(TokenType::Eof)) {
parse_callback();
if (!match(TokenType::Comma))
break;
consume(TokenType::Comma);
};
if (surrounded_by_parentheses)
consume(TokenType::ParenClose);
}
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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