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https://github.com/RGBCube/serenity
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3163929990
This patch adds NativeProperty, which can be used to implement object properties that have C++ getters and/or setters. Use this to move String.prototype.length to its correct place. :^)
63 lines
2.6 KiB
C++
63 lines
2.6 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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#include <AK/Function.h>
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#include <LibJS/Heap.h>
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#include <LibJS/Interpreter.h>
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#include <LibJS/PrimitiveString.h>
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#include <LibJS/StringObject.h>
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#include <LibJS/StringPrototype.h>
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#include <LibJS/Value.h>
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namespace JS {
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StringPrototype::StringPrototype()
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{
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put_native_property(
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"length", [](Object* object) {
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ASSERT(object->is_string_object());
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return Value((i32) static_cast<const StringObject*>(object)->primitive_string()->string().length());
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},
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nullptr);
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put_native_function("charAt", [](Interpreter& interpreter, Vector<Value> arguments) -> Value {
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i32 index = 0;
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if (!arguments.is_empty())
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index = arguments[0].to_i32();
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Value this_value = interpreter.this_value();
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ASSERT(this_value.is_object());
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ASSERT(this_value.as_object()->is_string_object());
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auto underlying_string = static_cast<const StringObject*>(this_value.as_object())->primitive_string()->string();
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if (index < 0 || index >= static_cast<i32>(underlying_string.length()))
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return js_string(interpreter.heap(), String::empty());
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return js_string(interpreter.heap(), underlying_string.substring(index, 1));
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});
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}
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StringPrototype::~StringPrototype()
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{
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}
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}
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