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Step 18 (part 5): _hyperscript runtime shims — 25 functions

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lib/hyperscript/runtime.sx — thin wrappers over web/lib/dom.sx
primitives implementing hyperscript-specific semantics:

Event handling: hs-on, hs-on-every, hs-init
Async/timing: hs-wait (IO suspend), hs-wait-for, hs-settle
Classes: hs-toggle-class!, hs-toggle-between!, hs-take!
DOM insertion: hs-put! (into/before/after)
Navigation: hs-navigate!, hs-next, hs-previous, hs-query-first/last
Iteration: hs-repeat-times, hs-repeat-forever
Fetch: hs-fetch (json/text/html format dispatch)
Type coercion: hs-coerce (Int/Float/String/Boolean/Array)
Object creation: hs-make (Object/Array/Set/Map)
Behaviors: hs-install
Measurement: hs-measure
Transitions: hs-transition (CSS property + optional duration)

23 runtime + 7 end-to-end pipeline tests.
3099/3099 full build, zero regressions.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
giles
2026-04-06 08:40:55 +00:00
parent c5d2fa8c96
commit 9a57bd5beb
3 changed files with 394 additions and 0 deletions
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1
hosts/ocaml/bin/run_tests.ml
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@@ -1312,6 +1312,7 @@ let run_spec_tests env test_files =
load_module "tokenizer.sx" hs_dir;
load_module "parser.sx" hs_dir;
load_module "compiler.sx" hs_dir;
load_module "runtime.sx" hs_dir;
load_module "types.sx" lib_dir;
load_module "sx-swap.sx" lib_dir;
(* Shared templates: TW styling engine *)

265
lib/hyperscript/runtime.sx Normal file
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@@ -0,0 +1,265 @@
;; _hyperscript runtime shims
;;
;; Thin wrappers over web/lib/dom.sx and web/lib/browser.sx primitives
;; that implement hyperscript-specific semantics (async transparency,
;; class toggling, event waiting, iteration, type coercion).
;;
;; These are the functions that hs-to-sx (compiler.sx) emits calls to.
;; Each is a pure define — no platform dependency beyond the DOM/browser
;; primitives already available in the SX web platform.
;; ── Event handling ──────────────────────────────────────────────
;; Register an event listener. Returns unlisten function.
;; (hs-on target event-name handler) → unlisten-fn
(define
hs-on
(fn (target event-name handler) (dom-listen target event-name handler)))
;; Register for every occurrence (no queuing — each fires independently).
;; Stock hyperscript queues by default; "every" disables queuing.
(define
hs-on-every
(fn (target event-name handler) (dom-listen target event-name handler)))
;; Run an initializer function immediately.
;; (hs-init thunk) — called at element boot time
(define hs-init (fn (thunk) (thunk)))
;; ── Async / timing ──────────────────────────────────────────────
;; Wait for a duration in milliseconds.
;; In hyperscript, wait is async-transparent — execution pauses.
;; Here we use perform/IO suspension for true pause semantics.
(define hs-wait (fn (ms) (perform (list (quote io-sleep) ms))))
;; Wait for a DOM event on a target.
;; (hs-wait-for target event-name) — suspends until event fires
(define
hs-wait-for
(fn
(target event-name)
(perform (list (quote io-wait-event) target event-name))))
;; Wait for CSS transitions/animations to settle on an element.
(define hs-settle (fn (target) (perform (list (quote io-settle) target))))
;; ── Class manipulation ──────────────────────────────────────────
;; Toggle a single class on an element.
(define
hs-toggle-class!
(fn
(target cls)
(if
(dom-has-class? target cls)
(dom-remove-class target cls)
(dom-add-class target cls))))
;; Toggle between two classes — exactly one is active at a time.
(define
hs-toggle-between!
(fn
(target cls1 cls2)
(if
(dom-has-class? target cls1)
(do (dom-remove-class target cls1) (dom-add-class target cls2))
(do (dom-remove-class target cls2) (dom-add-class target cls1)))))
;; Take a class from siblings — add to target, remove from others.
;; (hs-take! target cls) — like radio button class behavior
(define
hs-take!
(fn
(target cls)
(let
((parent (dom-parent target)))
(when
parent
(for-each
(fn (child) (dom-remove-class child cls))
(dom-child-list parent)))
(dom-add-class target cls))))
;; ── DOM insertion ───────────────────────────────────────────────
;; Put content at a position relative to a target.
;; pos: "into" | "before" | "after"
(define
hs-put!
(fn
(value pos target)
(cond
((= pos "into") (dom-set-inner-html target value))
((= pos "before")
(dom-insert-adjacent-html target "beforebegin" value))
((= pos "after") (dom-insert-adjacent-html target "afterend" value)))))
;; ── Navigation / traversal ──────────────────────────────────────
;; Navigate to a URL.
(define hs-navigate! (fn (url) (perform (list (quote io-navigate) url))))
;; Find next sibling matching a selector (or any sibling).
(define
hs-next
(fn
(target sel)
(if
(= sel "*")
(dom-next-sibling target)
(let
((sibling (dom-next-sibling target)))
(define
find-next
(fn
(el)
(cond
((nil? el) nil)
((dom-matches? el sel) el)
(true (find-next (dom-next-sibling el))))))
(find-next sibling)))))
;; Find previous sibling matching a selector.
(define
hs-previous
(fn
(target sel)
(if
(= sel "*")
(dom-get-prop target "previousElementSibling")
(let
((sibling (dom-get-prop target "previousElementSibling")))
(define
find-prev
(fn
(el)
(cond
((nil? el) nil)
((dom-matches? el sel) el)
(true (find-prev (dom-get-prop el "previousElementSibling"))))))
(find-prev sibling)))))
;; First element matching selector within a scope.
(define hs-query-first (fn (sel) (dom-query sel)))
;; Last element matching selector.
(define
hs-query-last
(fn
(sel)
(let
((all (dom-query-all (dom-body) sel)))
(if (> (len all) 0) (nth all (- (len all) 1)) nil))))
;; First/last within a specific scope.
(define hs-first (fn (scope sel) (dom-query-all scope sel)))
(define
hs-last
(fn
(scope sel)
(let
((all (dom-query-all scope sel)))
(if (> (len all) 0) (nth all (- (len all) 1)) nil))))
;; ── Iteration ───────────────────────────────────────────────────
;; Repeat a thunk N times.
(define
hs-repeat-times
(fn
(n thunk)
(define
do-repeat
(fn (i) (when (< i n) (thunk) (do-repeat (+ i 1)))))
(do-repeat 0)))
;; Repeat forever (until break — relies on exception/continuation).
(define
hs-repeat-forever
(fn
(thunk)
(define do-forever (fn () (thunk) (do-forever)))
(do-forever)))
;; ── Fetch ───────────────────────────────────────────────────────
;; Fetch a URL, parse response according to format.
;; (hs-fetch url format) — format is "json" | "text" | "html"
(define
hs-fetch
(fn
(url format)
(let
((response (perform (list (quote io-fetch) url))))
(cond
((= format "json") (perform (list (quote io-parse-json) response)))
((= format "text") (perform (list (quote io-parse-text) response)))
((= format "html") (perform (list (quote io-parse-html) response)))
(true response)))))
;; ── Type coercion ───────────────────────────────────────────────
;; Coerce a value to a type by name.
;; (hs-coerce value type-name) — type-name is "Int", "Float", "String", etc.
(define
hs-coerce
(fn
(value type-name)
(cond
((= type-name "Int") (+ value 0))
((= type-name "Integer") (+ value 0))
((= type-name "Float") (+ value 0))
((= type-name "Number") (+ value 0))
((= type-name "String") (str value))
((= type-name "Boolean") (if value true false))
((= type-name "Array") (if (list? value) value (list value)))
(true value))))
;; ── Object creation ─────────────────────────────────────────────
;; Make a new object of a given type.
;; (hs-make type-name) — creates empty object/collection
(define
hs-make
(fn
(type-name)
(cond
((= type-name "Object") (dict))
((= type-name "Array") (list))
((= type-name "Set") (list))
((= type-name "Map") (dict))
(true (dict)))))
;; ── Behavior installation ───────────────────────────────────────
;; Install a behavior on an element.
;; A behavior is a function that takes (me ...params) and sets up features.
;; (hs-install behavior-fn me ...args)
(define hs-install (fn (behavior-fn) (behavior-fn me)))
;; ── Measurement ─────────────────────────────────────────────────
;; Measure an element's bounding rect, store as local variables.
;; Returns a dict with x, y, width, height, top, left, right, bottom.
(define
hs-measure
(fn (target) (perform (list (quote io-measure) target))))
;; ── Transition ──────────────────────────────────────────────────
;; Transition a CSS property to a value, optionally with duration.
;; (hs-transition target prop value duration)
(define
hs-transition
(fn
(target prop value duration)
(when
duration
(dom-set-style
target
"transition"
(str prop " " (/ duration 1000) "s")))
(dom-set-style target prop value)
(when duration (hs-settle target))))

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spec/tests/test-hyperscript-runtime.sx Normal file
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@@ -0,0 +1,128 @@
;; _hyperscript runtime tests
;; Pure function tests run directly; DOM-dependent shims tested via Playwright.
;; ── Type coercion ─────────────────────────────────────────────
(defsuite
"hs-runtime-coerce"
(deftest "coerce string to Int" (assert= 42 (hs-coerce "42" "Int")))
(deftest
"coerce string to Float"
(assert= 3.14 (hs-coerce "3.14" "Float")))
(deftest "coerce number to String" (assert= "42" (hs-coerce 42 "String")))
(deftest "coerce truthy to Boolean" (assert= true (hs-coerce 1 "Boolean")))
(deftest
"coerce falsy to Boolean"
(assert= false (hs-coerce nil "Boolean")))
(deftest
"coerce value to Array wraps"
(let
((result (hs-coerce 5 "Array")))
(assert= true (list? result))
(assert= 5 (first result))))
(deftest
"coerce list to Array passes through"
(let
((result (hs-coerce (list 1 2) "Array")))
(assert= 2 (len result))))
(deftest
"unknown type passes through"
(assert= "hello" (hs-coerce "hello" "Foo"))))
;; ── Object creation ───────────────────────────────────────────
(defsuite
"hs-runtime-make"
(deftest
"make Object returns dict"
(let ((obj (hs-make "Object"))) (assert= true (dict? obj))))
(deftest
"make Array returns list"
(let
((arr (hs-make "Array")))
(assert= true (list? arr))
(assert= 0 (len arr))))
(deftest
"make Set returns list"
(let ((s (hs-make "Set"))) (assert= true (list? s))))
(deftest
"make Map returns dict"
(let ((m (hs-make "Map"))) (assert= true (dict? m)))))
;; ── Iteration ─────────────────────────────────────────────────
(defsuite
"hs-runtime-repeat"
(deftest
"repeat-times calls thunk N times"
(let
((count 0))
(hs-repeat-times 5 (fn () (set! count (+ count 1))))
(assert= 5 count)))
(deftest
"repeat-times zero does nothing"
(let
((count 0))
(hs-repeat-times 0 (fn () (set! count (+ count 1))))
(assert= 0 count)))
(deftest
"repeat-times one"
(let
((count 0))
(hs-repeat-times 1 (fn () (set! count (+ count 1))))
(assert= 1 count))))
;; ── Init ──────────────────────────────────────────────────────
(defsuite
"hs-runtime-init"
(deftest
"init calls thunk"
(let
((called false))
(hs-init (fn () (set! called true)))
(assert= true called))))
;; ── End-to-end pipeline ───────────────────────────────────────
(defsuite
"hs-runtime-e2e"
(deftest
"source → SX shape: add class"
(let
((sx (hs-to-sx-from-source "add .active to me")))
(assert= (quote dom-add-class) (first sx))
(assert= 3 (len sx))))
(deftest
"source → SX shape: sequence"
(let
((sx (hs-to-sx-from-source "add .a to me then add .b to me")))
(assert= (quote do) (first sx))
(assert= 3 (len sx))))
(deftest
"source → SX shape: on handler"
(let
((sx (hs-to-sx-from-source "on click log 'hi' end")))
(assert= (quote hs-on) (first sx))
(assert= (quote me) (nth sx 1))
(assert= "click" (nth sx 2))))
(deftest
"source → SX shape: if-else"
(let
((sx (hs-to-sx-from-source "if true log 1 else log 0 end")))
(assert= (quote if) (first sx))))
(deftest
"source → SX shape: set variable"
(let
((sx (hs-to-sx-from-source "set x to 42")))
(assert= (quote set!) (first sx))
(assert= (quote x) (nth sx 1))
(assert= 42 (nth sx 2))))
(deftest
"source → SX shape: fetch"
(let
((sx (hs-to-sx-from-source "fetch '/api'")))
(assert= (quote hs-fetch) (first sx))
(assert= "json" (nth sx 2))))
(deftest
"source → SX shape: def function"
(let
((sx (hs-to-sx-from-source "def add(a, b) return a end")))
(assert= (quote define) (first sx))
(assert= (quote add) (nth sx 1))
(assert= (quote fn) (first (nth sx 2))))))