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LibJS: Add Array.prototype.forEach()

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Linus Groh 2020-04-13 18:49:08 +01:00 • committed by Andreas Kling
parent 29253bf932
commit 866172a721
3 changed files with 106 additions and 0 deletions
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40
Libraries/LibJS/Runtime/ArrayPrototype.cpp
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@ -1,5 +1,6 @@
/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2020, Linus Groh <mail@linusgroh.de>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -31,12 +32,14 @@
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/ArrayPrototype.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/Function.h>
#include <LibJS/Runtime/Value.h>
namespace JS {
ArrayPrototype::ArrayPrototype()
{
put_native_function("forEach", for_each, 1);
put_native_function("pop", pop, 0);
put_native_function("push", push, 1);
put_native_function("shift", shift, 0);
@ -61,6 +64,43 @@ static Array* array_from(Interpreter& interpreter)
return static_cast<Array*>(this_object);
}
static Function* callback_from_args(Interpreter& interpreter, const String& name)
{
if (interpreter.argument_count() < 1) {
interpreter.throw_exception<TypeError>(String::format("Array.prototype.%s() requires at least one argument", name.characters()));
return nullptr;
}
auto callback = interpreter.argument(0);
if (!callback.is_object() || !callback.as_object().is_function()) {
interpreter.throw_exception<TypeError>(String::format("%s is not a function", callback.to_string().characters()));
return nullptr;
}
return static_cast<Function*>(&callback.as_object());
}
Value ArrayPrototype::for_each(Interpreter& interpreter)
{
auto* array = array_from(interpreter);
if (!array)
return {};
auto* callback = callback_from_args(interpreter, "forEach");
if (!callback)
return {};
auto this_value = interpreter.argument(1);
auto initial_array_size = array->elements().size();
for (size_t i = 0; i < initial_array_size; ++i) {
if (i >= array->elements().size())
break;
auto value = array->elements()[i];
if (value.is_empty())
continue;
interpreter.call(callback, this_value, { value, Value((i32)i), array });
if (interpreter.exception())
return {};
}
return js_undefined();
}
Value ArrayPrototype::push(Interpreter& interpreter)
{
auto* array = array_from(interpreter);

2
Libraries/LibJS/Runtime/ArrayPrototype.h
View file

@ -1,5 +1,6 @@
/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2020, Linus Groh <mail@linusgroh.de>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -38,6 +39,7 @@ public:
private:
virtual const char* class_name() const override { return "ArrayPrototype"; }
static Value for_each(Interpreter&);
static Value pop(Interpreter&);
static Value push(Interpreter&);
static Value shift(Interpreter&);