// Copyright 2022 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,
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// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef SRC_TINT_AST_LET_H_
#define SRC_TINT_AST_LET_H_

#include "src/tint/ast/variable.h"

namespace tint::ast {

/// A "let" declaration is a name for a function-scoped runtime typed value.
///
/// Examples:
///
/// ```
///   let twice_depth : i32 = width + width;  // Must have initializer
/// ```
/// @see https://www.w3.org/TR/WGSL/#let-decls
class Let final : public utils::Castable<Let, Variable> {
  public:
    /// Create a 'let' variable
    /// @param pid the identifier of the program that owns this node
    /// @param nid the unique node identifier
    /// @param source the variable source
    /// @param name the variable name
    /// @param type the declared variable type
    /// @param initializer the initializer expression
    /// @param attributes the variable attributes
    Let(ProgramID pid,
        NodeID nid,
        const Source& source,
        const Identifier* name,
        Type type,
        const Expression* initializer,
        utils::VectorRef<const Attribute*> attributes);

    /// Destructor
    ~Let() override;

    /// @returns "let"
    const char* Kind() const override;

    /// Clones this node and all transitive child nodes using the `CloneContext`
    /// `ctx`.
    /// @param ctx the clone context
    /// @return the newly cloned node
    const Let* Clone(CloneContext* ctx) const override;
};

}  // namespace tint::ast

#endif  // SRC_TINT_AST_LET_H_