| /* |
| * Copyright 2022 WebAssembly Community Group participants |
| * |
| * 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 wasm_wat_parser_h |
| #define wasm_wat_parser_h |
| |
| #include <string_view> |
| |
| #include "wasm.h" |
| |
| namespace wasm::WATParser { |
| |
| struct Ok {}; |
| |
| struct None {}; |
| |
| struct Err { |
| std::string msg; |
| }; |
| |
| template<typename T = Ok> struct Result { |
| std::variant<T, Err> val; |
| |
| Result(Result<T>& other) = default; |
| Result(const Err& e) : val(std::in_place_type<Err>, e) {} |
| Result(Err&& e) : val(std::in_place_type<Err>, std::move(e)) {} |
| template<typename U = T> |
| Result(U&& u) : val(std::in_place_type<T>, std::forward<U>(u)) {} |
| |
| Err* getErr() { return std::get_if<Err>(&val); } |
| T& operator*() { return *std::get_if<T>(&val); } |
| T* operator->() { return std::get_if<T>(&val); } |
| }; |
| |
| template<typename T = Ok> struct MaybeResult { |
| std::variant<T, None, Err> val; |
| |
| MaybeResult() : val(None{}) {} |
| MaybeResult(MaybeResult<T>& other) = default; |
| MaybeResult(const Err& e) : val(std::in_place_type<Err>, e) {} |
| MaybeResult(Err&& e) : val(std::in_place_type<Err>, std::move(e)) {} |
| template<typename U = T> |
| MaybeResult(U&& u) : val(std::in_place_type<T>, std::forward<U>(u)) {} |
| |
| // Whether we have an error or a value. Useful for assignment in loops and if |
| // conditions where errors should not get lost. |
| operator bool() const { return !std::holds_alternative<None>(val); } |
| |
| Err* getErr() { return std::get_if<Err>(&val); } |
| T& operator*() { return *std::get_if<T>(&val); } |
| T* operator->() { return std::get_if<T>(&val); } |
| |
| T* getPtr() { return std::get_if<T>(&val); } |
| }; |
| |
| // Parse a single WAT module. |
| Result<> parseModule(Module& wasm, std::string_view in); |
| |
| } // namespace wasm::WATParser |
| |
| #endif // wasm_wat_parser.h |