| // Copyright 2017 PDFium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com |
| |
| #ifndef FXJS_CJS_RESULT_H_ |
| #define FXJS_CJS_RESULT_H_ |
| |
| #include "fxjs/js_resources.h" |
| #include "third_party/abseil-cpp/absl/types/optional.h" |
| #include "v8/include/v8-forward.h" |
| |
| class CJS_Result { |
| public: |
| // Wrap constructors with static methods so we can apply WARN_UNUSED_RESULT, |
| // otherwise we can't catch places where someone mistakenly writes: |
| // |
| // if (error) |
| // CJS_Result(JS_ERROR_CODE); |
| // |
| // instead of |
| // |
| // if (error) |
| // return CJS_Result(JS_ERROR_CODE); |
| // |
| static CJS_Result Success() WARN_UNUSED_RESULT { return CJS_Result(); } |
| static CJS_Result Success(v8::Local<v8::Value> value) WARN_UNUSED_RESULT { |
| return CJS_Result(value); |
| } |
| static CJS_Result Failure(const WideString& str) WARN_UNUSED_RESULT { |
| return CJS_Result(str); |
| } |
| static CJS_Result Failure(JSMessage id) WARN_UNUSED_RESULT { |
| return CJS_Result(id); |
| } |
| |
| CJS_Result(const CJS_Result&); |
| ~CJS_Result(); |
| |
| bool HasError() const { return error_.has_value(); } |
| WideString Error() const { return error_.value(); } |
| |
| bool HasReturn() const { return !return_.IsEmpty(); } |
| v8::Local<v8::Value> Return() const { return return_; } |
| |
| private: |
| CJS_Result(); // Successful but empty return. |
| explicit CJS_Result(v8::Local<v8::Value>); // Successful return with value. |
| explicit CJS_Result(const WideString&); // Error with custom message. |
| explicit CJS_Result(JSMessage id); // Error with stock message. |
| |
| absl::optional<WideString> error_; |
| v8::Local<v8::Value> return_; |
| }; |
| |
| #endif // FXJS_CJS_RESULT_H_ |