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LibJS: Add StringObject, an Object wrapper around primitive strings

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This object will (soon) be implicitly created to wrap a primitive
string when one is used in a context that requires an object.
This commit is contained in:
Andreas Kling 2020-03-11 18:55:54 +01:00
parent 111ef762f6
commit 6ec6fa1a02
3 changed files with 95 additions and 0 deletions
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1
Libraries/LibJS/Makefile
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@ -7,6 +7,7 @@ OBJS = \
Interpreter.o \ Interpreter.o \
Object.o \ Object.o \
PrimitiveString.o \ PrimitiveString.o \
StringObject.o \
Value.o Value.o
LIBRARY = libjs.a LIBRARY = libjs.a

49
Libraries/LibJS/StringObject.cpp Normal file
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@ -0,0 +1,49 @@
/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <LibJS/PrimitiveString.h>
#include <LibJS/StringObject.h>
#include <LibJS/Value.h>
namespace JS {
StringObject::StringObject(PrimitiveString* string)
: m_string(string)
{
put("length", Value(static_cast<i32>(m_string->string().length())));
}
StringObject::~StringObject()
{
}
void StringObject::visit_children(Cell::Visitor& visitor)
{
Object::visit_children(visitor);
visitor.visit(m_string);
}
}

45
Libraries/LibJS/StringObject.h Normal file
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@ -0,0 +1,45 @@
/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <LibJS/Object.h>
namespace JS {
class StringObject final : public Object {
public:
explicit StringObject(PrimitiveString*);
virtual ~StringObject() override;
virtual void visit_children(Visitor&) override;
private:
virtual const char* class_name() const override { return "StringObject"; }
PrimitiveString* m_string { nullptr };
};
}