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Adds two new top-level SXTP message types alongside
request/response/condition/event, modelled on Datastar's
datastar-patch-elements and datastar-patch-signals SSE events:
(patch :target "#x" :mode outer :body (~card)) - DOM fragment
morph. Subsumes HTMX swap modes. Mode is outer (default) |
inner | replace | prepend | append | before | after | remove.
(signals :values {:n 3} :only-if-missing false) - reactive
state patch. nil value removes the signal. only-if-missing
skips existing signals (lazy init).
A server response stream can mix both freely; clients dispatch
by head symbol, ordering preserved. Cleaner than HTMX's
swap-mode-per-trigger because the patch shape is decoupled from
the triggering element/attribute.
Spec at applications/sxtp/spec.sx (patch-fields, signals-fields,
patch-modes, example-patch-stream). Constructors / predicates /
accessors / serialise / parse in lib/host/sxtp.sx. 25 new tests
in lib/host/tests/sxtp.sx (predicates, mode normalisation, fixed
field order, remove-without-body, signals round-trip). Host
conformance 129/129 (was 104/104).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>