// Copyright 2020 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef SRC_TINT_LANG_WGSL_AST_NODE_H_
#define SRC_TINT_LANG_WGSL_AST_NODE_H_

#include <string>

#include "src/tint/lang/wgsl/ast/node_id.h"
#include "src/tint/utils/diagnostic/source.h"
#include "src/tint/utils/id/generation_id.h"
#include "src/tint/utils/rtti/castable.h"

// Forward declarations
namespace tint::ast {
class CloneContext;
}

namespace tint::ast {

/// AST base class node
class Node : public Castable<Node> {
  public:
    ~Node() override;

    /// Performs a deep clone of this object using the CloneContext `ctx`.
    /// @param ctx the clone context
    /// @return the newly cloned object
    virtual const Node* Clone(CloneContext& ctx) const = 0;

    /// The identifier of the program that owns this node
    const GenerationID generation_id;

    /// The node identifier, unique for the program.
    const NodeID node_id;

    /// The node source data
    const Source source;

  protected:
    /// Create a new node
    /// @param pid the identifier of the program that owns this node
    /// @param nid the unique node identifier
    /// @param src the input source for the node
    Node(GenerationID pid, NodeID nid, const Source& src);

  private:
    Node(const Node&) = delete;
    Node(Node&&) = delete;
};

}  // namespace tint::ast

namespace tint {

/// @param node a pointer to an AST node
/// @returns the GenerationID of the given AST node.
inline GenerationID GenerationIDOf(const ast::Node* node) {
    return node ? node->generation_id : GenerationID();
}

}  // namespace tint

#endif  // SRC_TINT_LANG_WGSL_AST_NODE_H_