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Add logic for reflecting IDREF (single or FrozenArray) attributes #3917

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Add logic for reflecting IDREF (single or FrozenArray) attributes #3917

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d20d68b
Add logic for reflecting IDREF (single) attributes.
Aug 9, 2018
6c993af
Update element and sequence<element> reflection sections
Jan 3, 2019
45e454c
Address Anne's comments
Jan 7, 2019
fcdff87
Source formatting nits
domenic Jan 7, 2019
d58b34a
More tweaks
domenic Jan 7, 2019
d405676
Nullable types and attribute change steps
Jan 7, 2019
ec4438c
Use FrozenArray; move IDREF parsing step to attribute update steps
Jan 10, 2019
d5859bd
Review comments from Anne
Jan 14, 2019
d3ba958
Allow elements to be from any less-nested shadow tree
Jan 15, 2019
7350c16
Do not run attribute change steps if attribute was set via reflection
Jan 15, 2019
6487b47
Be more explicit about checking whether the content attribute was set…
Jan 16, 2019
8e27621
Fix typo attrAssociatedElements -> attrAssociatedElement
Jul 3, 2019
bda0102
Rework definition of attr-associated element(s) to avoid over-specifying
Jul 4, 2019
f6e501f
Address domenic's comments
Aug 2, 2019
63a45e8
Editorial tweaks to T? reflection
domenic Aug 2, 2019
3cc73cd
Editorial and slight normative tweaks to FrozenArray<T>? reflection
domenic Aug 2, 2019
003e307
Update based on AOM discussions
Oct 28, 2020
ca6d62d
Remove references to cached attr-elements
Mar 30, 2021
228b604
Revert "Remove references to cached attr-elements"
Mar 31, 2021
b2ce057
Return null if the attribute is not present, and empty array instead …
Apr 6, 2021
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Original file line number Diff line number Diff line change
Expand Up @@ -2622,6 +2622,7 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
<li><dfn data-x-href="https://heycam.github.io/webidl/#include">include</dfn></li>
<li><dfn data-x-href="https://heycam.github.io/webidl/#dfn-inherit">inherit</dfn></li>
<li><dfn data-x-href="https://heycam.github.io/webidl/#dfn-interface-prototype-object">interface prototype object</dfn></li>
<li><dfn data-x-href="https://heycam.github.io/webidl/#implements">implements</dfn></li>
<li><dfn data-x-href="https://heycam.github.io/webidl/#es-platform-objects">[[Realm]] field of a platform object</dfn></li>
<li><dfn data-x-href="https://heycam.github.io/webidl/#dfn-callback-context">callback context</dfn></li>
<li><dfn data-x-href="https://heycam.github.io/webidl/#dfn-frozen-array-type">frozen array</dfn> and
Expand Down Expand Up @@ -2940,6 +2941,8 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
<li>The <dfn data-x-href="https://dom.spec.whatwg.org/#concept-tree-child" data-x="concept-tree-child">child</dfn> concept</li>
<li>The <dfn data-x-href="https://dom.spec.whatwg.org/#concept-tree-root">root</dfn> and <dfn data-x-href="https://dom.spec.whatwg.org/#concept-shadow-including-root">shadow-including root</dfn> concepts</li>
<li>The <dfn data-x-href="https://dom.spec.whatwg.org/#concept-tree-inclusive-ancestor">inclusive ancestor</dfn>,
<dfn data-x-href="https://dom.spec.whatwg.org/#concept-tree-descendant">descendant</dfn>,
<dfn data-x="concept-shadow-including-ancestor" data-x-href="https://dom.spec.whatwg.org/#concept-shadow-including-ancestor">shadow-including ancestor</dfn>,
<dfn data-x-href="https://dom.spec.whatwg.org/#concept-shadow-including-descendant">shadow-including descendant</dfn>,
<dfn data-x-href="https://dom.spec.whatwg.org/#concept-shadow-including-inclusive-descendant">shadow-including inclusive descendant</dfn>, and
<dfn data-x-href="https://dom.spec.whatwg.org/#concept-shadow-including-inclusive-ancestor">shadow-including inclusive ancestor</dfn> concepts</li>
Expand Down Expand Up @@ -7218,8 +7221,274 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
return a <code>DOMTokenList</code> object whose associated element is the element in question and
whose associated attribute's local name is the name of the attribute in question.</p>

</div>
<p>If a reflecting IDL attribute <var>attr</var> has the type <code
data-x=""><var>T</var>?</code>, where <var>T</var> is either <code>Element</code> or an
interface that inherits from <code>Element</code>, then:

<ul>
<li><p>Elements of the type this IDL attribute appears on have an <dfn>explicitly set
<var>attr</var>-element</dfn>, which is an element or null. It is initially null.</p></li>

<li>
<p>Elements of the type this IDL attribute appears on have an <dfn data-export=""><var>attr</var>-associated
element</dfn>. To compute the <span><var>attr</var>-associated element</span> for such an
element <var>element</var>:</p>

<ol>
<li>
<p>If <var>element</var>'s <span>explicitly set <var>attr</var>-element</span> is not null:</p>
<ul>
<li><p>If <var>element</var>'s <span>explicitly set <var>attr</var>-element</span> is a
<span>descendant</span> of any of <var>element</var>'s <span
data-x="concept-shadow-including-ancestor">shadow-including ancestors</span>, then return
<var>element</var>'s <span>explicitly set <var>attr</var>-element</span>.</p></li>
<li><p>Otherwise, return null.</p></li>
</ul>
</li>

<li>
<p>Otherwise, if the content attribute is present on <var>element</var>, then return the first
element <var>candidate</var>, in <span>tree order</span>, that meets the following
criteria:</p>

<ul class="brief">
<li><var>candidate</var>'s <span>root</span> is the same as <var>element</var>'s
<span>root</span>,</li>
<li><var>candidate</var>'s <span data-x="concept-ID">ID</span> is the value of the content
attribute, and</li>
<li><var>candidate</var> <span>implements</span> <var>T</var>.</li>
</ul>

<p>If no such element exists, then return null.</p>
</li>

<li><p>Return null.</p></li>
</ol>

<p class="note">Other parts of this specification, or other specifications using attribute
reflection, are generally expected to consult the <span><var>attr</var>-associated
element</span>. The <span>explicitly set <var>attr</var>-element</span> is an internal
implementation detail of the <span><var>attr</var>-associated element</span>, and is not to be
used directly.</p>
</li>

<li><p>On getting, the IDL attribute must return this element's <span><var>attr</var>-associated
element</span>.</p></li>

<li>
<p>On setting, the IDL attribute must perform the following steps:</p>
<ol>
<li><p>Let <var>id</var> be the empty string.</p></li>

<li><p>If the given value:</p>
<ul class="brief">
<li>has the same <span>root</span> as this element, and</li>
<li>has an <code data-x="attr-id">id</code> attribute, and</li>
<li>is the first element in this element's <span>node tree</span> whose <span
data-x="concept-ID">ID</span> is the value of that <code data-x="attr-id">id</code>
attribute,</li>
</ul>
<p>then set <var>id</var> to the given value's <span data-x="concept-ID">ID</span>.</p>

<li><p>Set the content attribute's value for this element to <var>id</var>.</p></li>

<li><p>Set this element's <span>explicitly set <var>attr</var>-element</span> to the given
value.</p></li>
</ol>
</li>

<li>
<p>The following <span data-x="concept-element-attributes-change-ext">attribute change
steps</span> are used to synchronize between the content attribute and the IDL attribute:</p>
<ol>
<li><p>If <var>localName</var> is not the content attribute's local name, or
<var>namespace</var> is not null, then return.</p></li>

<li><p>Set <var>element</var>'s <span>explicitly set <var>attr</var>-element</span> to
null.</p></li>
</ol>
</li>
</ul>

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I think we'll need a slightly new paradigm, since conventional reflection is more of a 1:1 relationship. Maybe something like

In addition to simple [reflection], a pair of IDL attributes can be said to element-reflect a content attribute. This means that (brief summary description of the behavior, if possible).

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Deferring this for now.

<p>If a reflecting IDL attribute <var>attr</var> has the type <code
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data-x="">FrozenArray&lt;<var>T</var>&gt;?</code>, where <var>T</var> is either
<code>Element</code> or an interface that inherits from <code>Element</code>, then:</p>

<ul>
<li><p>Elements of the type this IDL attribute appears on have <dfn>explicitly set
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<var>attr</var>-elements</dfn>, which is either a <span>list</span> of elements or null. It is
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initially null.</p></li>
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s/is/must be/

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Hm, I'm trying to define attrElement in terms of attr, so it's kind of tautological to say attr must be named attr, I think.

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You're defining two things here: the attr IDL element, and the attrElement IDL element. Both of them are in terms of the attr content attribute. In particular I think of this bullet point as explaining the preconditions for using the element-reflect concept.

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The content attribute may be named something other than attr, though - case in point being for vs htmlFor and htmlForElement.

<li><p>Elements of the type this IDL attribute appears on have <dfn>cached
<var>attr</var>-associated elements</dfn>, which is a <code
data-x="">FrozenArray&lt;<code>Element</code>&gt;?</code>. It is initially null.</p></li>
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Instead of "On getting attr attribute, the IDL attribute must return...", say "On getting the attr IDL attribute, return..."

Similar phrasing tweaks for the rest of them. It should always be "On [get|set]ing the X IDL attribute, [imperative phrasing]".

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Done.

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<li>
<p>Elements of the type this IDL attribute appears on have <dfn
data-export=""><var>attr</var>-associated elements</dfn>. To compute the
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This is not great. The better model is to say something in the intro to this element-reflect concept like "The element to which the content attribute belongs has an attr-associated element", and then operate on that concept. (Better names appreciated for that concept.)

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Deferring this for now.

<span><var>attr</var>-associated elements</span> for such an element <var>element</var>:</p>

<ol>
<li><p>Let <var>elements</var> be an empty <span>list</span>.</p></li>

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<li>
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You can make this a bit nicer by saying "On setting the attr attribute to newValue" and then using newValue instead of "the specified value"

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Done.

<p>If <var>element</var>'s <span>explicitly set <var>attr</var>-elements</span> is not
null, then:</p>
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Not previous, current.

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Done.

<ol>
<li>
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With the "attr-associated element" concept, this can be made more precise. Probably setting it to null.

Also, instead of saying "should", you need to say "must", or better yet, just use the imperative form ("delete" or "set"). In general all the below steps should be rephrased into imperative form.

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Rephrased as imperative; deferred the attr-associated element concept part.

<p><span data-x="list iterate">For each</span> <var>attrElement</var> in the <var>element</var>'s
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Use the same phrasing as below: "remove the content attribute and return"

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Done.

<span>explicitly set <var>attr</var>-elements</span>:</p>
<ol>
<li><p>If <var>attrElement</var> is not a <span>descendant</span> of any of <var>element</var>'s <span
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I don't think we should include this step. "valid value" would need to be defined. Probably it's better to just let the next step find nothing.

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Done.

data-x="concept-shadow-including-ancestor">shadow-including ancestors</span>, then
<span>continue</span>.</p></li>
<li><p>Add <var>attrElement</var> to <var>elements</var>.</p></li>
</ol>
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We'll want to rephrase this not to call the public API later. But for now it'd make things clearer to remove the document., because the root may be a shadow root, in particular.

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I reworded the text from the definition of getElementById.

</li>
</ol>
</li>
<li>
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s/it is type-compatible with the/it implements the interface given by the type of the/

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Done.

<p>Otherwise:</p>
<ol>
<li><p>If the content attribute is not present on <var>element</var>, return null.</p></li>

<li><p>Let <var>tokens</var> be the content attribute's value, <span data-x="split a string on
ASCII whitespace">split on ASCII whitespace</span>.

<li>
<p><span data-x="list iterate">For each</span> <var>id</var> in <var>tokens</var>:</p>
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Again you can use newValue and then use that in place of "the given element".

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Done (used newElement).

<ol>
<li>
<p>Let <var>candidate</var> be the first element, in <span>tree order</span>, that meets the
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"light tree" is not a defined concept these days. I think the first clause is probably enough?

Here and below, it appears the canonical phrasing is "X and Y are [not] in the same tree".

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@alice alice Aug 14, 2018 •
edited
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Done.

following criteria:</p>
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type-compatibility is guaranteed here by the IDL layer, so this is redundant.

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Done.


<ul class="brief">
<li><var>candidate</var>'s <span>root</span> is the same as <var>element</var>'s
<span>root</span>,</li>
<li><var>candidate</var>'s <span data-x="concept-ID">ID</span> is <var>id</var>, and</li>
<li><var>candidate</var> <span>implements</span> <var>T</var>.</li>
</ul>

<p>If no such element exists, then <span>continue</span>.</p>
</li>
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<li><p><span data-x="list append">Append</span> <var>candidate</var> to
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<var>elements</var>.</p></li>
</ol>
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</li>
</ol>
</li>

<li><p>Return <var>elements</var>.</p></li>
</ol>
</li>

<li>
<p class="note">Other parts of this specification, or other specifications using attribute
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reflection, are generally expected to consult the <span><var>attr</var>-associated
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It seems that if you're two shadow trees deep, the shadow tree in the middle would not be considered here. That's wrong, no?

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Good catch. I've tried to rewrite it so it can be in the element's tree or the host's tree - I'm not sure if we want/need to allow arbitrary levels of nesting here (e.g. host's host's host's tree).

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The text that there's there, "descendant of a shadow-including ancestor", would allow that...

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Right, that was after I rewrote it again :)

elements</span>. The <span>explicitly set <var>attr</var>-elements</span> are an internal
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implementation detail of the <span><var>attr</var>-associated elements</span>, and are not to be
used directly. Similarly, the <span>cached <var>attr</var>-associated elements</span> are an
internal implementation detail of the IDL attribute's getter.</p>
</li>

<li>
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<p>On getting, the IDL attribute must perform the following steps:</p>

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<ol>
<li><p>Let <var>elements</var> be this element's <span><var>attr</var>-associated
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Can this happen? IDL would throw, no?

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I think you're right. This could not be reached, and should be removed. We should add tests that it just throws without resetting any internal state.

elements</span>.</p></li>

<li><p>If the contents of <var>elements</var> is equal to the contents of this element's
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<span>cached <var>attr</var>-associated elements</span>, then return this element's
<span>cached <var>attr</var>-associated elements</span>.</p></li>

<li><p>Let <var>elementsAsFrozenArray</var> be <var>elements</var>, <span
data-x="concept-idl-convert">converted</span> to a <code
data-x="">FrozenArray&lt;<var>T</var>&gt;?</code>.</p></li>
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<li><p>Set this element's <span>cached <var>attr</var>-associated elements</span> to
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<var>elementsAsFrozenArray</var>.</p></li>

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<li><p>Return <var>elementsAsFrozenArray</var>.</p></li>
</ol>

<p class="note">This extra caching layer is necessary to preserve the invariant that <code
data-x="">element.reflectedElements === element.reflectedElements</code>.</p>
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</li>

<li>
<p>On setting, the IDL attribute must perform the following steps:</p>
<ol>
<li>
<p>If the given value is null:</p>
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<ol>
<li><p>Set this element's <span>explicitly set <var>attr</var>-elements</span> to
null.</p></li>

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<li><p>Remove the content attribute from this element.</p></li>

<li><p>Return.</p></li>
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I think this bit makes it unlike other reflecting attributes. Perhaps this is better introduced as a separate macro-mechanism. E.g., element x supports element-pointer attribute y or some such. As reflecting IDL attributes generally modify the content attribute and the behavior is then defined in terms of those. Though I guess @domenic saw this differently so maybe it's okay?

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I have reworked this a bit now and the attribute change steps are much more minimal. The same objection may well still apply, though.

</ol>
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</li>

<li><p>Let <var>value</var> be an empty string.</p></li>

<li>
<p><span data-x="list iterate">For each</span> <var>element</var> in the given value:</p>
<ol>
<li><p>If <var>value</var> is empty and <var>elements</var> is non-empty, then <span
data-x="list append">append</span> <var>element</var> to <var>elements</var> and
<span>continue</span>.</p></li>

<li><p><span data-x="list append">Append</span> <var>element</var> to
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<var>elements</var>.</p></li>

<li>
<p>If <var>element</var>:</p>

<ul class="brief">
<li>does not have the same <span>root</span> as this element, or</li>
<li>has no <code data-x="attr-id">id</code> attribute, or</li>
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<li>is not the first element in this element's <span>node tree</span> whose <span
data-x="concept-ID">ID</span> is the value of that <code data-x="attr-id">id</code>
attribute,</li>
</ul>
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Shouldn't this also be used for the empty list? Perhaps it's better to not make this sequence thing nullable and use the empty list as a default?

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Good question. I think we probably do want to be able to disambiguate between "attribute not set/unset" and "attribute is empty" - for example, there is a big distinction between <img alt=""> and <img> with no alt. So, I think nullable is correct.

Currently the empty list is handled - the for loop just runs zero times.


<p>then set <var>value</var> to the empty string, and <span>continue</span>.</p>
</li>

<li><p>Let <var>id</var> be <var>element</var>'s <span
data-x="concept-ID">ID</span>.</p></li>

<li><p>If <var>value</var> is not the empty string, then append U+0020 SPACE to
<var>value</var>.</p></li>

<li><p>Append <var>id</var> to <var>value</var>.</p></li>
</ol>
</li>

<li><p>Set the content attribute's value for this element to <var>value</var>.</p></li>

<li><p>Set this element's <span>explicitly set <var>attr</var>-elements</span> to
<var>elements</var>.</p></li>
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</ol>
</li>

<li>
<p>The following <span data-x="concept-element-attributes-change-ext">attribute change
steps</span> are used to synchronize between the content attribute and the IDL attribute:</p>
<ol>
<li><p>If <var>localName</var> is not the content attribute's local name, or
<var>namespace</var> is not null, then return.</p></li>

<li><p>Set <var>element</var>'s <span>explicitly set <var>attr</var>-elements</span> to
null.</p></li>
</ol>
</li>
</ul>

</div>
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<h4>Collections</h4>

Expand Down