| 1 | //===--- RefactoringOptionVisitor.h - Clang refactoring library -----------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #ifndef LLVM_CLANG_TOOLING_REFACTORING_REFACTORINGOPTIONVISITOR_H |
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| 10 | #define LLVM_CLANG_TOOLING_REFACTORING_REFACTORINGOPTIONVISITOR_H |
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| 11 | |
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| 12 | #include "clang/Basic/LLVM.h" |
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| 13 | #include <optional> |
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| 14 | #include <type_traits> |
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| 15 | |
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| 16 | namespace clang { |
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| 17 | namespace tooling { |
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| 18 | |
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| 19 | class RefactoringOption; |
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| 20 | |
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| 21 | /// An interface that declares functions that handle different refactoring |
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| 22 | /// option types. |
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| 23 | /// |
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| 24 | /// A valid refactoring option type must have a corresponding \c visit |
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| 25 | /// declaration in this interface. |
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| 26 | class RefactoringOptionVisitor { |
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| 27 | public: |
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| 28 | virtual ~RefactoringOptionVisitor() {} |
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| 29 | |
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| 30 | virtual void visit(const RefactoringOption &Opt, |
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| 31 | std::optional<std::string> &Value) = 0; |
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| 32 | }; |
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| 33 | |
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| 34 | namespace traits { |
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| 35 | namespace internal { |
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| 36 | |
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| 37 | template <typename T> struct HasHandle { |
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| 38 | private: |
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| 39 | template <typename ClassT> |
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| 40 | static auto check(ClassT *) -> typename std::is_same< |
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| 41 | decltype(std::declval<RefactoringOptionVisitor>().visit( |
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| 42 | Opt: std::declval<RefactoringOption>(), |
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| 43 | Value&: *std::declval<std::optional<T> *>())), |
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| 44 | void>::type; |
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| 45 | |
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| 46 | template <typename> static std::false_type check(...); |
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| 47 | |
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| 48 | public: |
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| 49 | using Type = decltype(check<RefactoringOptionVisitor>(nullptr)); |
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| 50 | }; |
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| 51 | |
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| 52 | } // end namespace internal |
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| 53 | |
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| 54 | /// A type trait that returns true iff the given type is a type that can be |
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| 55 | /// stored in a refactoring option. |
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| 56 | template <typename T> |
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| 57 | struct IsValidOptionType : internal::HasHandle<T>::Type {}; |
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| 58 | |
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| 59 | } // end namespace traits |
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| 60 | } // end namespace tooling |
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| 61 | } // end namespace clang |
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| 62 | |
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| 63 | #endif // LLVM_CLANG_TOOLING_REFACTORING_REFACTORINGOPTIONVISITOR_H |
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| 64 | |
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