Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Clean up some parts of object creation #663

Open
wants to merge 2 commits into
base: main
Choose a base branch
from
Open

Clean up some parts of object creation #663

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
4945941
Some stylistic editing
TimothyGu Feb 26, 2019
2eb3347
Define internal slots of objects directly
TimothyGu Feb 26, 2019
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
67 changes: 35 additions & 32 deletions index.bs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -78,6 +78,7 @@ urlPrefix: https://tc39.github.io/ecma262/; spec: ECMA-262
text: Array; url: sec-array-objects
text: ArrayBuffer; url: sec-arraybuffer-objects
text: DataView; url: sec-dataview-objects
text: Iterator; url: sec-iterator-interface
text: Map; url: sec-map-objects
text: Promise; url: sec-promise-objects
text: Set; url: sec-set-objects
Expand Down Expand Up @@ -191,6 +192,7 @@ urlPrefix: https://tc39.github.io/ecma262/; spec: ECMA-262
url: sec-object-internal-methods-and-internal-slots
text: internal method
text: internal slot
text: essential internal method
text: Number type; url: sec-ecmascript-language-types-number-type
text: Object; for: ECMAScript; url: sec-object-type
for: ordinary object; url: sec-ordinary-object-internal-methods-and-internal-slots
Expand Down Expand Up @@ -6719,18 +6721,7 @@ shall be treated in accordance with the rules for exotic objects.
{{HTMLAllCollection}} and {{Location}} interfaces. [[HTML]]</span>
</p>

Unless otherwise specified, exotic objects defined in this section and other specifications have the
same [=ordinary object/internal slots=] as ordinary objects, and all of the internal methods for
which alternative definitions are not given are the same as [=ordinary object/internal
methods|those=] of ordinary objects.

Unless otherwise specified, the \[[Extensible]] internal slot
of objects defined in this section has the value <emu-val>true</emu-val>.

Unless otherwise specified, the \[[Prototype]] internal slot
of objects defined in this section is {{%ObjectPrototype%}}.

Unless otherwise specified, {{ECMAScript/typeof}} operator, when called on an
Unless otherwise specified, the {{ECMAScript/typeof}} operator, when called on an
exotic object that is not a [=function object=] defined in this section and
other specifications, must return the string "<code>object</code>".

Expand Down Expand Up @@ -10697,7 +10688,8 @@ the [=regular attributes=] and [=regular operations=] defined on the interface,
and is described in more detail in [[#interface-prototype-object]].

Note: Since an [=interface object=] is a [=function object=]
the <code>typeof</code> operator will return "function" when applied to an interface object.
the {{ECMAScript/typeof}} operator will return "<code>function</code>" when
applied to an interface object.

<div algorithm>

Expand Down Expand Up @@ -10925,7 +10917,7 @@ It has properties that correspond to the [=constants=] defined on that interface
as described in sections [[#es-constants]].

Note: Since a legacy callback interface object is a [=function object=]
the <code>typeof</code> operator will return "function"
the {{ECMAScript/typeof}} operator will return "<code>function</code>"
when applied to a [=legacy callback interface object=].

<div algorithm>
Expand Down Expand Up @@ -10959,11 +10951,12 @@ for that interface on which named properties are exposed.
1. If |interface| is declared to inherit from another interface,
then set |proto| to the [=interface prototype object=] in |realm| for the [=inherited interface=].
1. Otherwise, set |proto| to |realm|.\[[Intrinsics]].[[{{%ObjectPrototype%}}]].
1. Let |obj| be a newly created object.
1. Set |obj|'s internal methods to the definitions specified in
1. Let |obj| be a newly created object, with the same internal slots as ordinary objects
specified in [=ECMA-262 Ordinary object internal methods and internal slots=].
1. Set |obj|'s [=essential internal methods=] to the definitions specified in
[=ECMA-262 Ordinary object internal methods and internal slots=],
unless they are specified in the the rest of [[#named-properties-object]].
1. Set |obj|'s remaining internal methods to the definitions specified below.
1. Set |obj|'s remaining [=essential internal methods=] to the definitions specified below.
1. Set |obj|.\[[Prototype]] to |proto|.
1. Set |obj|.\[[Extensible]] to <emu-val>true</emu-val>.
1. Return |obj|.
Expand Down Expand Up @@ -11871,12 +11864,16 @@ The value of the [=function object=]’s <code class="idl">name</code> property

A <dfn id="dfn-default-iterator-object" export>default iterator object</dfn> for a given
[=interface=], target and iteration kind
is an object whose \[[Prototype]] [=internal slot=] is the
is an ordinary object that implements the {{Iterator}} ECMAScript interface.

The initial value of the \[[Prototype]] [=internal slot=] of a [=default iterator object=] is the
[=iterator prototype object=]
for the [=interface=].

A [=default iterator object=]
has three internal values:
The initial value of the \[[Extensible]] [=internal slot=] of a [=default iterator object=] is
<emu-val>true</emu-val>.

A [=default iterator object=] has three internal values:

1. its <em>target</em>, which is an object whose values are to be iterated,
1. its <em>kind</em>, which is the iteration kind,
Expand All @@ -11896,19 +11893,24 @@ class="idl">Object.prototype.toString()</code> is called on a [=default
iterator object=] of a given [=interface=], the [=class string=] of the
[=iterator prototype object=] of that [=interface=] is used.

Issue: Define creation of a [=default iterator object=] imperatively instead.


<h5 id="es-iterator-prototype-object">Iterator prototype object</h5>

The <dfn id="dfn-iterator-prototype-object" export>iterator prototype object</dfn>
for a given [=interface=]
is an object that exists for every interface that has a
is an ordinary object that exists for every interface that has a
[=pair iterator=]. It serves as the
prototype for [=default iterator objects=]
for the interface.

The \[[Prototype]] [=internal slot=] of an [=iterator prototype object=]
The initial value of the \[[Prototype]] [=internal slot=] of an [=iterator prototype object=]
must be {{%IteratorPrototype%}}.

The initial value of the \[[Extensible]] [=internal slot=] of an [=iterator prototype object=]
must be <emu-val>true</emu-val>.

<div algorithm="to invoke the next property of iterators">

An [=iterator prototype object=] must have a <code class="idl">next</code> data property with attributes
Expand Down Expand Up @@ -11960,6 +11962,8 @@ The [=class string=] of an [=iterator prototype object=] for a given [=interface
is the result of concatenating the [=identifier=] of the [=interface=]
and the string "<code> Iterator</code>".

Issue: Define creation of an [=iterator prototype object=] imperatively instead.


<h4 id="es-maplike">Maplike declarations</h4>

Expand Down Expand Up @@ -12396,23 +12400,22 @@ the Realm given as an argument.
Realm |realm| and a JavaScript value |newTarget|, perform the following steps:

1. Assert: |interface| is [=exposed=] in |realm|.
1. If |newTarget| is <emu-val>undefined</emu-val>, then:
1. Let |prototype| be the [=interface prototype object=] for |interface| in
|realm|.
1. Otherwise:
1. Let |prototype| be the [=interface prototype object=] for |interface| in |realm|.
1. If |newTarget| is not <emu-val>undefined</emu-val>, then:
1. Assert: [$IsCallable$](|newTarget|) is true.
1. Let |prototype| be [=?=] [$Get$](|newTarget|, "prototype").
1. Set |prototype| to [=?=] [$Get$](|newTarget|, "<code>prototype</code>").
1. If [$Type$](|prototype|) is not Object, then:
1. Let |targetRealm| be [$GetFunctionRealm$](|newTarget|).
1. Set |prototype| to the [=interface prototype object=] for |interface| in
|targetRealm|.
1. Let |slots| be « \[[Realm]], \[[PrimaryInterface]] ».
1. Let |instance| be a newly created [=ECMAScript/object=] in |realm|
with an internal slot for each name in |slots|.
1. Let |instance| be a newly created [=ECMAScript/object=] in |realm|, with the same internal
slots as ordinary objects specified in [=ECMA-262 Ordinary object internal methods and
internal slots=], as well as \[[Realm]] and \[[PrimaryInterface]].
1. Set |instance|.\[[Prototype]] to |prototype|.
1. Set |instance|.\[[Extensible]] to <emu-val>true</emu-val>.
1. Set |instance|.\[[Realm]] to |realm|.
1. Set |instance|.\[[PrimaryInterface]] to |interface|.
1. Set |instance|.\[[Prototype]] to |prototype|.
1. Set |instance|'s essential internal methods to the definitions specified in
1. Set |instance|'s [=essential internal methods=] to the definitions specified in
[=ECMA-262 Ordinary object internal methods and internal slots=].
1. Let |interfaces| be the [=inclusive inherited interfaces=] of |interface|.
1. [=list/iterate|For every=] [=interface=] |ancestor interface| in |interfaces|:
Expand Down