giles
1cd81e5369
Upstream convention — elements wired up by hyperscript carry data-hyperscript-powered='true' so callers can find them. Net: core/bootstrap 17→19.
122 lines
4.1 KiB
Plaintext
122 lines
4.1 KiB
Plaintext
;; _hyperscript integration — wire _="..." attributes to compiled SX
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;;
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;; Entry points:
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;; (hs-handler src) — compile source to callable (fn (me) ...)
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;; (hs-activate! el) — activate hyperscript on a single element
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;; (hs-boot!) — scan DOM, activate all _="..." elements
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;; (hs-boot-subtree! root) — activate within a subtree (for HTMX swaps)
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;; ── Compile source to a handler function ────────────────────────
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;; Returns a function (fn (me) ...) that can be called with a DOM element.
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;; Uses eval-expr-cek to turn the SX data structure into a live closure.
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(begin
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(define
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hs-collect-vars
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(fn
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(sx)
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(define vars (list))
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(define
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reserved
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(list
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(quote me)
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(quote it)
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(quote event)
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(quote you)
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(quote yourself)))
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(define
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walk
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(fn
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(node)
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(when
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(list? node)
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(when
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(and
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(> (len node) 1)
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(= (first node) (quote set!))
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(symbol? (nth node 1)))
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(let
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((name (nth node 1)))
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(when
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(and
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(not (some (fn (v) (= v name)) vars))
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(not (some (fn (v) (= v name)) reserved)))
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(set! vars (cons name vars)))))
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(for-each walk node))))
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(walk sx)
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vars))
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(define
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hs-handler
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(fn
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(src)
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(let
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((sx (hs-to-sx-from-source src)))
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(let
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((extra-vars (hs-collect-vars sx)))
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(do
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(for-each
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(fn (v) (eval-expr-cek (list (quote define) v nil)))
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extra-vars)
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(let
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((guarded (list (quote guard) (list (quote _e) (list (quote true) (list (quote if) (list (quote and) (list (quote list?) (quote _e)) (list (quote =) (list (quote first) (quote _e)) "hs-return")) (list (quote nth) (quote _e) 1) (list (quote raise) (quote _e))))) sx)))
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(eval-expr-cek
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(list
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(quote fn)
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(list (quote me))
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(list
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(quote let)
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(list (list (quote it) nil) (list (quote event) nil))
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guarded))))))))))
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;; ── Activate a single element ───────────────────────────────────
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;; Reads the _="..." attribute, compiles, and executes with me=element.
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;; Marks the element to avoid double-activation.
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(define
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hs-activate!
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(fn
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(el)
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(let
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((src (dom-get-attr el "_")) (prev (dom-get-data el "hs-script")))
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(when
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(and src (not (= src prev)))
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(dom-set-data el "hs-script" src)
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(dom-set-data el "hs-active" true)
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(dom-set-attr el "data-hyperscript-powered" "true")
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(let ((handler (hs-handler src))) (handler el))))))
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;; ── Boot: scan entire document ──────────────────────────────────
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;; Called once at page load. Finds all elements with _ attribute,
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;; compiles their hyperscript, and activates them.
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(define
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hs-deactivate!
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(fn
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(el)
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(let
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((unlisteners (or (dom-get-data el "hs-unlisteners") (list))))
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(for-each (fn (u) (when u (u))) unlisteners)
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(dom-set-data el "hs-unlisteners" (list))
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(dom-set-data el "hs-active" false)
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(dom-set-data el "hs-script" nil))))
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;; ── Boot subtree: for dynamic content ───────────────────────────
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;; Called after HTMX swaps or dynamic DOM insertion.
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;; Only activates elements within the given root.
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(define
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hs-boot!
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(fn
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()
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(let
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((elements (dom-query-all (host-get (host-global "document") "body") "[_]")))
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(for-each (fn (el) (hs-activate! el)) elements))))
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(define
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hs-boot-subtree!
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(fn
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(root)
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(let
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((elements (dom-query-all root "[_]")))
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(for-each (fn (el) (hs-activate! el)) elements))
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(when (dom-get-attr root "_") (hs-activate! root)))) |