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LibJS: Start implementing iterable framework, add ArrayIterator

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With the addition of symbol keys, work can now be done on starting to
implement the well-known symbol functionality. The most important of
these well-known symbols is by far Symbol.iterator.

This patch adds IteratorPrototype, as well as ArrayIterator and
ArrayIteratorPrototype. In the future, sometime after StringIterator has
also been added, this will allow us to use Symbol.iterator directly in
for..of loops, enabling the use of custom iterator objects. Also makes
adding iterator support to native objects much easier (as will have to
be done for Map and Set, when they get added).
This commit is contained in:
Matthew Olsson 2020-07-09 14:58:20 -07:00 • committed by Andreas Kling
parent 51bfc6c6b3
commit 2ea85355fe
18 changed files with 657 additions and 1 deletions
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9
Libraries/LibJS/Runtime/GlobalObject.cpp
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@ -28,6 +28,7 @@
#include <AK/LogStream.h>
#include <LibJS/Interpreter.h>
#include <LibJS/Runtime/ArrayConstructor.h>
#include <LibJS/Runtime/ArrayIteratorPrototype.h>
#include <LibJS/Runtime/ArrayPrototype.h>
#include <LibJS/Runtime/BigIntConstructor.h>
#include <LibJS/Runtime/BigIntPrototype.h>
@ -41,6 +42,7 @@
#include <LibJS/Runtime/FunctionConstructor.h>
#include <LibJS/Runtime/FunctionPrototype.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/IteratorPrototype.h>
#include <LibJS/Runtime/JSONObject.h>
#include <LibJS/Runtime/MathObject.h>
#include <LibJS/Runtime/NativeFunction.h>
@ -84,6 +86,13 @@ void GlobalObject::initialize()
JS_ENUMERATE_BUILTIN_TYPES
#undef __JS_ENUMERATE
#define __JS_ENUMERATE(ClassName, snake_name) \
if (!m_##snake_name##_prototype) \
m_##snake_name##_prototype = heap().allocate<ClassName##Prototype>(*this, *this);
JS_ENUMERATE_ITERATOR_PROTOTYPES
#undef __JS_ENUMERATE
u8 attr = Attribute::Writable | Attribute::Configurable;
define_native_function("gc", gc, 0, attr);
define_native_function("isNaN", is_nan, 1, attr);