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Fix duplicate sx-cssx-live style tags
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Cache the style element reference in _cssx-style-el so flush-cssx-to-dom
never creates more than one. Previous code called dom-query on every
flush, which could miss the element during rapid successive calls,
creating duplicates.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
giles
2026-03-14 17:16:13 +00:00
parent 41f4772ba7
commit 730df5fab7
7 changed files with 531 additions and 118 deletions
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507
shared/static/scripts/sx-browser.js
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File diff suppressed because it is too large Load Diff

2
shared/sx/ref/adapter-dom.sx
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@@ -952,7 +952,7 @@
(dom-set-attr el k (str (dict-get attrs k))))
extra-keys)
;; Flush any newly collected CSS rules to live stylesheet
(flush-cssx-to-dom))
(run-post-render-hooks))
;; No longer a spread — clear tracked state
(do
(set! prev-classes (list))

47
shared/sx/ref/boot.sx
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@@ -88,7 +88,7 @@
(process-elements el)
(sx-hydrate-elements el)
(sx-hydrate-islands el)
(flush-cssx-to-dom))))))
(run-post-render-hooks))))))
;; --------------------------------------------------------------------------
@@ -120,7 +120,7 @@
(process-elements el)
(sx-hydrate-elements el)
(sx-hydrate-islands el)
(flush-cssx-to-dom)
(run-post-render-hooks)
(dom-dispatch el "sx:resolved" {:id id})))
(log-warn (str "resolveSuspense: no element for id=" id))))))
@@ -418,29 +418,30 @@
;; --------------------------------------------------------------------------
;; CSSX live flush — inject collected CSS rules into the DOM
;; Render hooks — generic pre/post callbacks for hydration, swap, mount.
;; The spec calls these at render boundaries; the app decides what to do.
;; Pre-render: setup before DOM changes (e.g. prepare state).
;; Post-render: cleanup after DOM changes (e.g. flush collected CSS).
;; --------------------------------------------------------------------------
;;
;; ~cssx/tw collects CSS rules via collect!("cssx" ...) during rendering.
;; On the server, ~cssx/flush emits a batch <style> tag. On the client,
;; islands render independently and no batch flush runs. This function
;; injects any unflushed rules into a persistent <style> element in <head>.
;; Called after hydration (boot + post-swap) to cover all render paths.
(define flush-cssx-to-dom :effects [mutation io]
(define *pre-render-hooks* (list))
(define *post-render-hooks* (list))
(define register-pre-render-hook :effects [mutation]
(fn ((hook-fn :as lambda))
(append! *pre-render-hooks* hook-fn)))
(define register-post-render-hook :effects [mutation]
(fn ((hook-fn :as lambda))
(append! *post-render-hooks* hook-fn)))
(define run-pre-render-hooks :effects [mutation io]
(fn ()
(let ((rules (collected "cssx")))
(when (not (empty? rules))
(let ((style (or (dom-query "#sx-cssx-live")
(let ((s (dom-create-element "style" nil)))
(dom-set-attr s "id" "sx-cssx-live")
(dom-set-attr s "data-cssx" "")
(dom-append-to-head s)
s))))
(dom-set-prop style "textContent"
(str (or (dom-get-prop style "textContent") "")
(join "" rules))))
(clear-collected! "cssx")))))
(for-each (fn (hook) (cek-call hook nil)) *pre-render-hooks*)))
(define run-post-render-hooks :effects [mutation io]
(fn ()
(for-each (fn (hook) (cek-call hook nil)) *post-render-hooks*)))
;; --------------------------------------------------------------------------
@@ -464,7 +465,7 @@
(process-sx-scripts nil)
(sx-hydrate-elements nil)
(sx-hydrate-islands nil)
(flush-cssx-to-dom)
(run-post-render-hooks)
(process-elements nil))))

40
shared/sx/ref/js.sx
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@@ -618,7 +618,7 @@
(if (not (nil? renamed))
renamed
;; General mangling rules
(let ((result name))
(let ((result (replace name "*" "_")))
;; Handle trailing ? and !
(let ((result (cond
(ends-with? result "?")
@@ -1422,23 +1422,27 @@
(= (keyword-name (nth expr 2)) "effects"))
(nth expr 4)
(nth expr 2))))
(if (nil? val-expr)
(str "var " (js-mangle name) " = NIL;")
;; Detect zero-arg self-tail-recursive functions → while loops
(if (and (list? val-expr)
(not (empty? val-expr))
(= (type-of (first val-expr)) "symbol")
(or (= (symbol-name (first val-expr)) "fn")
(= (symbol-name (first val-expr)) "lambda"))
(list? (nth val-expr 1))
(= (len (nth val-expr 1)) 0)
(js-is-self-tail-recursive? name (rest (rest val-expr))))
;; While loop optimization
(let ((body (rest (rest val-expr)))
(loop-body (js-emit-loop-body name body)))
(str "var " (js-mangle name) " = function() { while(true) { " loop-body " } };"))
;; Normal define
(str "var " (js-mangle name) " = " (js-expr val-expr) ";"))))))
(let ((mangled (js-mangle name))
(var-decl
(if (nil? val-expr)
(str "var " (js-mangle name) " = NIL;")
;; Detect zero-arg self-tail-recursive functions → while loops
(if (and (list? val-expr)
(not (empty? val-expr))
(= (type-of (first val-expr)) "symbol")
(or (= (symbol-name (first val-expr)) "fn")
(= (symbol-name (first val-expr)) "lambda"))
(list? (nth val-expr 1))
(= (len (nth val-expr 1)) 0)
(js-is-self-tail-recursive? name (rest (rest val-expr))))
;; While loop optimization
(let ((body (rest (rest val-expr)))
(loop-body (js-emit-loop-body name body)))
(str "var " mangled " = function() { while(true) { " loop-body " } };"))
;; Normal define
(str "var " mangled " = " (js-expr val-expr) ";")))))
;; Self-register: every spec define is available to evaluated SX code
(str var-decl "\nPRIMITIVES[\"" name "\"] = " mangled ";")))))
;; --------------------------------------------------------------------------

4
shared/sx/ref/orchestration.sx
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@@ -460,7 +460,7 @@
(sx-process-scripts root)
(sx-hydrate root)
(sx-hydrate-islands root)
(flush-cssx-to-dom)
(run-post-render-hooks)
(process-elements root)))
@@ -871,7 +871,7 @@
(hoist-head-elements-full target)
(process-elements target)
(sx-hydrate-elements target)
(flush-cssx-to-dom)
(run-post-render-hooks)
(dom-dispatch target "sx:clientRoute"
(dict "pathname" pathname))
(log-info (str "sx:route client " pathname)))))

28
shared/sx/ref/platform_js.py
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@@ -1509,33 +1509,9 @@ CEK_FIXUPS_JS = '''
return cekValue(state);
};
// Expose spec functions so evaluated SX code can use them.
// Type inspection (platform interface from boundary.sx)
PRIMITIVES["type-of"] = typeOf;
PRIMITIVES["symbol-name"] = symbolName;
PRIMITIVES["keyword-name"] = keywordName;
PRIMITIVES["callable?"] = isCallable;
PRIMITIVES["lambda?"] = isLambda;
PRIMITIVES["lambda-name"] = lambdaName;
PRIMITIVES["component?"] = isComponent;
PRIMITIVES["island?"] = isIsland;
PRIMITIVES["make-symbol"] = function(n) { return new Symbol(n); };
// Parser (from parser.sx)
PRIMITIVES["sx-serialize"] = sxSerialize;
// CEK machine (from cek.sx/frames.sx)
PRIMITIVES["make-cek-state"] = makeCekState;
PRIMITIVES["cek-step"] = cekStep;
PRIMITIVES["cek-run"] = cekRun;
PRIMITIVES["cek-terminal?"] = cekTerminal_p;
PRIMITIVES["cek-value"] = cekValue;
PRIMITIVES["eval-expr-cek"] = evalExprCek;
// Render (from adapter-html.sx / render.sx)
// Synthetic primitives — not direct spec defines but needed by evaluated code
PRIMITIVES["is-html-tag?"] = function(n) { return HTML_TAGS.indexOf(n) >= 0; };
// Environment (for creating eval contexts)
PRIMITIVES["make-symbol"] = function(n) { return new Symbol(n); };
PRIMITIVES["make-env"] = function() { return merge(componentEnv, PRIMITIVES); };
'''

21
sx/sxc/init-client.sx.txt
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@@ -1,5 +1,5 @@
;; ---------------------------------------------------------------------------
;; SX app boot — styles and behaviors injected on page load
;; SX app boot — styles, behaviors, and post-render hooks
;;
;; Replaces inline_css and init_sx from Python app config.
;; Called as a data-init script on every page.
@@ -11,6 +11,25 @@
(collect! "cssx" "@keyframes sxJiggle{0%,100%{transform:translateX(0)}25%{transform:translateX(-.5px)}75%{transform:translateX(.5px)}}")
(collect! "cssx" "a.sx-request{animation:sxJiggle .3s ease-in-out infinite}")
;; CSSX flush hook — inject collected CSS rules into a <style> tag.
;; The spec calls (run-post-render-hooks) after hydration/swap/mount.
;; This is the application's CSS injection strategy.
(console-log "init-client: registering cssx flush hook, type:" (type-of (fn () nil)))
(register-post-render-hook
(fn ()
(console-log "cssx flush: running, rules:" (len (collected "cssx")))
(let ((rules (collected "cssx")))
(when (not (empty? rules))
(let ((style (or (dom-query "[data-cssx]")
(let ((s (dom-create-element "style" nil)))
(dom-set-attr s "data-cssx" "")
(dom-append-to-head s)
s))))
(dom-set-prop style "textContent"
(str (or (dom-get-prop style "textContent") "")
(join "" rules))))
(clear-collected! "cssx")))))
;; Nav link aria-selected update on client-side routing
(dom-listen (dom-body) "sx:clientRoute"
(fn (e)