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https://github.com/RGBCube/serenity
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2a65db7c12
The MDN example for creating a custom error type in javascript uses:
function CustomError(foo, message, fileName, lineNumber) {
var instance = new Error(message, fileName, lineNumber);
instance.name = 'CustomError';
instance.foo = foo;
Object.setPrototypeOf(instance, Object.getPrototypeOf(this));
return instance;
}
The name property on the Error prototype needs to be settable for
this to work properly.
66 lines
2.8 KiB
C++
66 lines
2.8 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/FlyString.h>
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#include <LibJS/Runtime/Object.h>
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namespace JS {
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class Error : public Object {
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public:
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Error(const FlyString& name, const String& message);
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virtual ~Error() override;
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const FlyString& name() const { return m_name; }
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const String& message() const { return m_message; }
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void set_name(const FlyString& name) { m_name = name; }
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private:
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virtual bool is_error() const final { return true; }
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virtual const char* class_name() const override { return "Error"; }
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FlyString m_name;
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String m_message;
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};
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#define DECLARE_ERROR_SUBCLASS(ClassName, snake_name, PrototypeName, ConstructorName) \
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class ClassName final : public Error { \
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public: \
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ClassName(const String& message); \
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virtual ~ClassName() override; \
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\
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private: \
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virtual const char* class_name() const override; \
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};
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#define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName) \
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DECLARE_ERROR_SUBCLASS(ClassName, snake_name, PrototypeName, ConstructorName)
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JS_ENUMERATE_ERROR_SUBCLASSES
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#undef __JS_ENUMERATE
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}
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