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Manage slot manipulation centrally and special case replace operations #1

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Manage slot manipulation centrally and special case replace operations #1

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67 changes: 42 additions & 25 deletions dom.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -2279,6 +2279,36 @@ steps:
<li><p>If <var>slot</var> is non-null, then run <a>assign slottables</a> for <var>slot</var>.
</ol>

<p>To <dfn noexport>update slots</dfn>, given <var>removedNodes</var>, <var>parent</var>, and
<var>addedNodes</var>, run these steps:

<ol>
<li>
<p>For each <var>removedNode</var> in <var>removedNodes</var>:

<ol>
<li><p>If <var>removedNode</var> is <a for=slotable>assigned</a>, then run
<a>assign slotables</a> for <var>removedNode</var>'s <a>assigned slot</a>.

<li><p>If <var>removedNode</var> has an <a>inclusive descendant</a> that is a <a>slot</a>, then
run <a>assign slotables for a tree</a> with <var>removedNode</var>.
</ol>

<li><p>If <var>parent</var>'s <a for=tree>root</a> is a <a for=/>shadow root</a> and
<var>parent</var> is a <a>slot</a> whose <a for=slot>assigned nodes</a> is the empty list, then run
<a>signal a slot change</a> for <var>parent</var>.

<li><p>Run <a>assign slotables for a tree</a> with <var>parent</var>'s <a for=tree>root</a>.

<li>
<p>For each <var>addedNode</var> in <var>addedNodes</var>:

<ol>
<li><p>If <var>parent</var> is a <a for=Element>shadow host</a> and <var>addedNode</var> is a
<a>slotable</a>, then <a>assign a slot</a> for <var>addedNode</var>.
</ol>
</ol>

<h5 id=signaling-slot-change>Signaling slot change</h5>

<p>Each <a>similar-origin window agent</a> has <dfn noexport id=signal-slot-list>signal slots</dfn>
Expand Down Expand Up @@ -2432,14 +2462,8 @@ before a <var>child</var>, with an optional <i>suppress observers flag</i>, run
<li><p>Otherwise, <a for=set>insert</a> <var>node</var> into <var>parent</var>'s
<a for=tree>children</a> before <var>child</var>'s <a for=tree>index</a>.

<li><p>If <var>parent</var> is a <a for=Element>shadow host</a> and <var>node</var> is a
<a>slottable</a>, then <a>assign a slot</a> for <var>node</var>.

<li><p>If <var>parent</var>'s <a for=tree>root</a> is a <a for=/>shadow root</a>, and
<var>parent</var> is a <a>slot</a> whose <a for=slot>assigned nodes</a> is the empty list,
then run <a>signal a slot change</a> for <var>parent</var>.

<li><p>Run <a>assign slottables for a tree</a> with <var>node</var>'s <a for=tree>root</a>.
<li><p>If the <i>suppress observers flag</i> is unset, then <a>update slots</a> with « »,
<var>parent</var>, and « <var>node</var> ».

<li>
<p>For each <a>shadow-including inclusive descendant</a> <var>inclusiveDescendant</var> of
Expand Down Expand Up @@ -2469,7 +2493,7 @@ before a <var>child</var>, with an optional <i>suppress observers flag</i>, run
</li>
</ol>

<li><p>If <i>suppress observers flag</i> is unset, then <a>queue a tree mutation record</a> for
<li><p>If the <i>suppress observers flag</i> is unset, then <a>queue a tree mutation record</a> for
<var>parent</var> with <var>nodes</var>, « », <var>previousSibling</var>, and <var>child</var>.

<li><p>Run the <a>children changed steps</a> for <var>parent</var>.
Expand Down Expand Up @@ -2559,6 +2583,9 @@ within a <var>parent</var>, run these steps:
<li><p><a for=/>Insert</a> <var>node</var> into <var>parent</var> before <var>referenceChild</var>
with the <i>suppress observers flag</i> set.

<li><p><a>Update slots</a> with « <var>removedNodes</var> », <var>parent</var>, and
« <var>nodes</var> ».

<li><p><a>Queue a tree mutation record</a> for <var>parent</var> with <var>nodes</var>,
<var>removedNodes</var>, <var>previousSibling</var>, and <var>referenceChild</var>.

Expand All @@ -2585,6 +2612,9 @@ within a <var>parent</var>, run these steps:
<li><p>If <var>node</var> is non-null, then <a for=/>insert</a> <var>node</var> into
<var>parent</var> before null with the <i>suppress observers flag</i> set.

<li><p>If the <i>suppress observers flag</i> is unset, then <a>update slots</a> with
« <var>removedNodes</var> », <var>parent</var>, and « <var>addedNodes</var> ».

<li><p>If either <var>addedNodes</var> or <var>removedNodes</var> <a for=set>is not empty</a>,
then <a>queue a tree mutation record</a> for <var>parent</var> with <var>addedNodes</var>,
<var>removedNodes</var>, null, and null.
Expand Down Expand Up @@ -2649,21 +2679,8 @@ indicated in the <a for=/>remove</a> algorithm below.

<li><p><a for=set>Remove</a> <var>node</var> from its <var>parent</var>'s <a for=tree>children</a>.

<li><p>If <var>node</var> is <a for=slottable>assigned</a>, then run <a>assign slottables</a> for
<var>node</var>'s <a>assigned slot</a>.

<li><p>If <var>parent</var>'s <a for=tree>root</a> is a <a for=/>shadow root</a>, and
<var>parent</var> is a <a>slot</a> whose <a for=slot>assigned nodes</a> is the empty list,
then run <a>signal a slot change</a> for <var>parent</var>.

<li>
<p>If <var>node</var> has an <a>inclusive descendant</a> that is a <a>slot</a>, then:

<ol>
<li><p>Run <a>assign slottables for a tree</a> with <var>parent</var>'s <a for=tree>root</a>.

<li><p>Run <a>assign slottables for a tree</a> with <var>node</var>.
</ol>
<li><p>If the <i>suppress observers flag</i> is unset, then <a>update slots</a> with
« <var>node</var> », <var>parent</var>, and « ».

<li><p>Run the <a>removing steps</a> with <var>node</var> and <var>parent</var>.

Expand Down Expand Up @@ -2701,7 +2718,7 @@ indicated in the <a for=/>remove</a> algorithm below.
<a for="transient registered observer">source</a> is <var>registered</var> to <var>node</var>'s
<a>registered observer list</a>.

<li><p>If <i>suppress observers flag</i> is unset, then <a>queue a tree mutation record</a> for
<li><p>If the <i>suppress observers flag</i> is unset, then <a>queue a tree mutation record</a> for
<var>parent</var> with « », « <var>node</var> », <var>oldPreviousSibling</var>, and
<var>oldNextSibling</var>.

Expand Down