/*
* This file is part of the Intuitive DSL project.
* Copyright (c) 2026 DBA Labs - Switzerland. All rights reserved.
*
* This program is dual-licensed under a commercial license and the AGPLv3.
* For commercial licensing, contact us at [email protected] or visit https://www.dbalabs.ch.
*
* AGPLv3 licensing:
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, version 3 (19 November 2007).
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/agpl-3.0.html>.
*/
package ch.dbalabs.intuitivedsl.grammar;
/**
* The base interface for all nodes in the Intuitive DSL engine Abstract Syntax Tree (AST).
* <p>
* This interface is sealed to ensure that the grammar structure is strictly bounded.
* It allows the parser and binder to use Java 17+ Pattern Matching (switch expressions)
* exhaustively without needing a default branch.
* </p>
*
* @author DBA Labs
*/
public sealed interface SyntaxNode permits
KeywordNode,
ParameterNode,
DelimiterNode,
GroupNode,
AlternativeNode,
MacroNode {
/**
* Indicates whether this specific node can be repeated multiple times.
* In iBNF grammar, this is typically represented by the ellipsis marker ('...').
*
* @return true if the node is repeatable, false otherwise
*/
boolean isRepeatable();
}