text: // 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_AST_CASE_STATEMENT_H_
  #define SRC_AST_CASE_STATEMENT_H_
  
  #include <memory>
  #include <utility>
  #include <vector>
  
  #include "src/ast/block_statement.h"
  #include "src/ast/expression.h"
  #include "src/ast/int_literal.h"
  #include "src/ast/statement.h"
  
  namespace tint {
  namespace ast {
  
  /// A list of case literals
  using CaseSelectorList = std::vector<IntLiteral*>;
  
  /// A case statement
  class CaseStatement : public Castable<CaseStatement, Statement> {
   public:
    /// Constructor
    /// @param source the source information
    /// @param selectors the case selectors
    /// @param body the case body
    CaseStatement(const Source& source,
                  CaseSelectorList selectors,
                  BlockStatement* body);
    /// Move constructor
    CaseStatement(CaseStatement&&);
    ~CaseStatement() override;
  
    /// @returns the case selectors, empty if none set
    const CaseSelectorList& selectors() const { return selectors_; }
    /// @returns true if this is a default statement
    bool IsDefault() const { return selectors_.empty(); }
  
    /// @returns the case body
    const BlockStatement* body() const { return body_; }
    /// @returns the case body
    BlockStatement* body() { return body_; }
  
    /// Clones this node and all transitive child nodes using the `CloneContext`
    /// `ctx`.
    /// @note Semantic information such as resolved expression type and intrinsic
    /// information is not cloned.
    /// @param ctx the clone context
    /// @return the newly cloned node
    CaseStatement* Clone(CloneContext* ctx) const override;
  
    /// @returns true if the node is valid
    bool IsValid() const override;
  
    /// Writes a representation of the node to the output stream
    /// @param out the stream to write to
    /// @param indent number of spaces to indent the node when writing
    void to_str(std::ostream& out, size_t indent) const override;
  
   private:
    CaseStatement(const CaseStatement&) = delete;
  
    CaseSelectorList const selectors_;
    BlockStatement* const body_;
  };
  
  /// A list of case statements
  using CaseStatementList = std::vector<CaseStatement*>;
  
  }  // namespace ast
  }  // namespace tint
  
  #endif  // SRC_AST_CASE_STATEMENT_H_
  