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Temporal proposal HTML serialization support
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This patch lets Temporal objects be serialized, both in storage and with
postMessage, if they use built-in calendars and timezones. This is the
only expected integration of Temporal with HTML/DOM expected initially;
see earlier discussion in w3ctag/design-reviews#311

Co-authored-by: Domenic Denicola <[email protected]>
Co-authored-by: Ms2ger <[email protected]>
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@littledan @domenic @Ms2ger
3 people committed Jun 20, 2024
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Expand Up @@ -3119,6 +3119,14 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
<li>The <dfn data-x="js-HostSystemUTCEpochNanoseconds" data-x-href="https://tc39.es/proposal-temporal/#sec-hostsystemutcepochnanoseconds">HostSystemUTCEpochNanoseconds</dfn> abstract operation</li>
<li>The <dfn data-x-href="https://tc39.es/proposal-temporal/#eqn-nsMaxInstant">nsMaxInstant</dfn> and
<dfn data-x-href="https://tc39.es/proposal-temporal/#eqn-nsMinInstant">nsMinInstant</dfn> values</li>
<li>The <dfn data-x-href="https://tc39.es/proposal-temporal/#sec-temporal.plaindate">%Temporal.PlainDate%</dfn> constructor</li>
<li>The <dfn data-x-href="https://tc39.es/proposal-temporal/#sec-temporal.plaintime">%Temporal.PlainTime%</dfn> constructor</li>
<li>The <dfn data-x-href="https://tc39.es/proposal-temporal/#sec-temporal.plaindatetime">%Temporal.PlainDateTime%</dfn> constructor</li>
<li>The <dfn data-x-href="https://tc39.es/proposal-temporal/#sec-temporal.zoneddatetime">%Temporal.ZonedDateTime%</dfn> constructor</li>
<li>The <dfn data-x-href="https://tc39.es/proposal-temporal/#sec-temporal.duration">%Temporal.Duration%</dfn> constructor</li>
<li>The <dfn data-x-href="https://tc39.es/proposal-temporal/#sec-temporal.instant">%Temporal.Instant%</dfn> constructor</li>
<li>The <dfn data-x-href="https://tc39.es/proposal-temporal/#sec-temporal.plainyearmonth">%Temporal.PlainYearMonth%</dfn> constructor</li>
<li>The <dfn data-x-href="https://tc39.es/proposal-temporal/#sec-temporal.plainmonthday">%Temporal.PlainMonthDay%</dfn> constructor</li>
</ul>
</dd>

Expand Down Expand Up @@ -9735,6 +9743,101 @@ interface <dfn interface>DOMStringList</dfn> {
</ol>
</li>

<li>
<p>Otherwise, if <var>value</var> has an [[InitializedTemporalDate]] internal slot, then:</p>

<ol>
<li><p>Set <var>serialized</var> to { [[Type]]: "Temporal.PlainDate", [[ISOYear]]:
<var>value</var>.[[ISOYear]], [[ISOMonth]]: <var>value</var>.[[ISOMonth]], [[ISODay]]:
<var>value</var>.[[ISODay]], [[Calendar]]: <var>value</var>.[[Calendar]] }.</p></li>
</ol>
</li>

<li>
<p>Otherwise, if <var>value</var> has an [[InitializedTemporalTime]] internal slot, then:</p>

<ol>
<li><p>Set <var>serialized</var> to { [[Type]]: "Temporal.PlainTime", [[ISOHour]]:
<var>value</var>.[[ISOHour]], [[ISOMinute]]: <var>value</var>.[[ISOMinute]], [[ISOSecond]]:
<var>value</var>.[[ISOSecond]], [[ISOMillisecond]]: <var>value</var>.[[ISOMillisecond]],
[[ISOMicrosecond]]: <var>value</var>.[[ISOMicrosecond]], [[ISONanosecond]]:
<var>value</var>.[[ISONanosecond]] }.</p></li>
</ol>
</li>

<li>
<p>Otherwise, if <var>value</var> has an [[InitializedTemporalDateTime]] internal slot,
then:</p>

<ol>
<li><p>Set <var>serialized</var> to { [[Type]]: "Temporal.PlainDateTime", [[ISOYear]]:
<var>value</var>.[[ISOYear]], [[ISOMonth]]: <var>value</var>.[[ISOMonth]], [[ISODay]]:
<var>value</var>.[[ISODay]], [[ISOHour]]: <var>value</var>.[[ISOHour]], [[ISOMinute]]:
<var>value</var>.[[ISOMinute]], [[ISOSecond]]: <var>value</var>.[[ISOSecond]],
[[ISOMillisecond]]: <var>value</var>.[[ISOMillisecond]], [[ISOMicrosecond]]:
<var>value</var>.[[ISOMicrosecond]], [[ISONanosecond]]: <var>value</var>.[[ISONanosecond]],
[[Calendar]]: <var>value</var>.[[Calendar]] }.</p></li>
</ol>
</li>

<li>
<p>Otherwise, if <var>value</var> has an [[InitializedTemporalZonedDateTime]] internal slot,
then:</p>

<ol>
<li><p>Set <var>serialized</var> to { [[Type]]: "Temporal.ZonedDateTime", [[Nanoseconds]]:
<var>value</var>.[[Nanoseconds]], [[TimeZone]]: <var>value</var>.[[TimeZone]], [[Calendar]]:
<var>value</var>.[[Calendar]] }.</p></li>
</ol>
</li>

<li>
<p>Otherwise, if <var>value</var> has an [[InitializedTemporalDuration]] internal slot,
then:</p>

<ol>
<li><p>Set <var>serialized</var> to { [[Type]]: "Temporal.Duration", [[Years]]:
<var>value</var>.[[Years]], [[Months]]: <var>value</var>.[[Months]], [[Weeks]]:
<var>value</var>.[[Weeks]], [[Days]]: <var>value</var>.[[Days]], [[Hours]]:
<var>value</var>.[[Hours]], [[Minutes]]: <var>value</var>.[[Minutes]], [[Seconds]]:
<var>value</var>.[[Seconds]], [[Milliseconds]]: <var>value</var>.[[Milliseconds]],
[[Microseconds]]: <var>value</var>.[[Microseconds]], [[Nanoseconds]]:
<var>value</var>.[[Nanoseconds]] }.</p></li>
</ol>
</li>

<li>
<p>Otherwise, if <var>value</var> has an [[InitializedTemporalInstant]] internal slot,
then:</p>

<ol>
<li><p>Set <var>serialized</var> to { [[Type]]: "Temporal.Instant", [[Nanoseconds]]:
<var>value</var>.[[Nanoseconds]] }.</p></li>
</ol>
</li>

<li>
<p>Otherwise, if <var>value</var> has an [[InitializedTemporalYearMonth]] internal slot,
then:</p>

<ol>
<li><p>Set <var>serialized</var> to { [[Type]]: "Temporal.PlainYearMonth", [[ISOYear]]:
<var>value</var>.[[ISOYear]], [[ISOMonth]]: <var>value</var>.[[ISOMonth]], [[ISODay]]:
<var>value</var>.[[ISODay]], [[Calendar]]: <var>value</var>.[[Calendar]] }.</p></li>
</ol>
</li>

<li>
<p>Otherwise, if <var>value</var> has an [[InitializedTemporalMonthDay]] internal slot,
then:</p>

<ol>
<li><p>Set <var>serialized</var> to { [[Type]]: "Temporal.PlainMonthDay", [[ISOYear]]:
<var>value</var>.[[ISOYear]], [[ISOMonth]]: <var>value</var>.[[ISOMonth]], [[ISODay]]:
<var>value</var>.[[ISODay]], [[Calendar]]: <var>value</var>.[[Calendar]] }.</p></li>
</ol>
</li>

<li>
<p>Otherwise, if <var>value</var> is a <span>platform object</span> that is a <span
data-x="serializable objects">serializable object</span>:</p>
Expand Down Expand Up @@ -10175,6 +10278,95 @@ o.myself = o;</code></pre>
</ol>
</li>

<li>
<p>Otherwise, if <var>serialized</var>.[[Type]] is "Temporal.PlainDate", then:</p>

<ol>
<li><p>Set <var>value</var> to ! <span>Construct</span>(<span>%Temporal.PlainDate%</span>,
&laquo; <var>serialized</var>.[[ISOYear]], <var>serialized</var>.[[ISOMonth]],
<var>serialized</var>.[[ISODay]], <var>serialized</var>.[[Calendar]] &raquo;).</p></li>
</ol>
</li>

<li>
<p>Otherwise, if <var>serialized</var>.[[Type]] is "Temporal.PlainTime", then:</p>

<ol>
<li><p>Set <var>value</var> to ! <span>Construct</span>(<span>%Temporal.PlainTime%</span>,
&laquo; <var>serialized</var>.[[ISOHour]], <var>serialized</var>.[[ISOMinute]],
<var>serialized</var>.[[ISOSecond]], <var>serialized</var>.[[ISOMillisecond]],
<var>serialized</var>.[[ISOMicrosecond]], <var>serialized</var>.[[ISONanosecond]]
&raquo;).</p></li>
</ol>
</li>

<li>
<p>Otherwise, if <var>serialized</var>.[[Type]] is "Temporal.PlainDateTime", then:</p>

<ol>
<li><p>Set <var>value</var> to ! <span>Construct</span>(<span>%Temporal.PlainDateTime%</span>,
&laquo; <var>serialized</var>.[[ISOYear]], <var>serialized</var>.[[ISOMonth]],
<var>serialized</var>.[[ISODay]], <var>serialized</var>.[[ISOHour]],
<var>serialized</var>.[[ISOMinute]], <var>serialized</var>.[[ISOSecond]],
<var>serialized</var>.[[ISOMillisecond]], <var>serialized</var>.[[ISOMicrosecond]],
<var>serialized</var>.[[ISONanosecond]], <var>serialized</var>.[[Calendar]] &raquo;).</p></li>
</ol>
</li>

<li>
<p>Otherwise, if <var>serialized</var>.[[Type]] is "Temporal.ZonedDateTime", then:</p>

<ol>
<li><p>Set <var>value</var> to ! <span>Construct</span>(<span>%Temporal.ZonedDateTime%</span>,
&laquo; <var>serialized</var>.[[Nanoseconds]], <var>serialized</var>.[[TimeZone]],
<var>serialized</var>.[[Calendar]] &raquo;).</p></li>
</ol>
</li>

<li>
<p>Otherwise, if <var>serialized</var>.[[Type]] is "Temporal.Duration", then:</p>

<ol>
<li><p>Set <var>value</var> to ! <span>Construct</span>(<span>%Temporal.Duration%</span>,
&laquo; <var>serialized</var>.[[Years]], <var>serialized</var>.[[Months]],
<var>serialized</var>.[[Weeks]], <var>serialized</var>.[[Days]],
<var>serialized</var>.[[Hours]], <var>serialized</var>.[[Minutes]],
<var>serialized</var>.[[Seconds]], <var>serialized</var>.[[Milliseconds]],
<var>serialized</var>.[[Microseconds]], <var>serialized</var>.[[Nanoseconds]]
&raquo;).</p></li>
</ol>
</li>

<li>
<p>Otherwise, if <var>serialized</var>.[[Type]] is "Temporal.Instant", then:</p>

<ol>
<li><p>Set <var>value</var> to ! <span>Construct</span>(<span>%Temporal.Instant%</span>,
&laquo; <var>serialized</var>.[[Nanoseconds]] &raquo;).</p></li>
</ol>
</li>

<li>
<p>Otherwise, if <var>serialized</var>.[[Type]] is "Temporal.PlainYearMonth", then:</p>

<ol>
<li><p>Set <var>value</var> to !
<span>Construct</span>(<span>%Temporal.PlainYearMonth%</span>, &laquo;
<var>serialized</var>.[[ISOYear]], <var>serialized</var>.[[ISOMonth]],
<var>serialized</var>.[[Calendar]], <var>serialized</var>.[[ISODay]] &raquo;).</p></li>
</ol>
</li>

<li>
<p>Otherwise, if <var>serialized</var>.[[Type]] is "Temporal.PlainMonthDay", then:</p>

<ol>
<li><p>Set <var>value</var> to ! <span>Construct</span>(<span>%Temporal.PlainMonthDay%</span>,
&laquo; <var>serialized</var>.[[ISOMonth]], <var>serialized</var>.[[ISODay]],
<var>serialized</var>.[[Calendar]], <var>serialized</var>.[[ISOYear]] &raquo;).</p></li>
</ol>
</li>

<li>
<p>Otherwise:</p>

Expand Down

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