From 3ce21774cc65699b1d58ac917473cc118cc37ff3 Mon Sep 17 00:00:00 2001 From: Johannes Raggam Date: Wed, 3 Jun 2026 23:12:02 +0200 Subject: [PATCH 1/2] feat(core signals): Add a TC39 signals polyfill. The TC39 signals specification for data binding. See: https://github.com/tc39/proposal-signals --- src/core/signals.js | 222 +++++++++++++++++++++++++++++++++++++++ src/core/signals.test.js | 186 ++++++++++++++++++++++++++++++++ 2 files changed, 408 insertions(+) create mode 100644 src/core/signals.js create mode 100644 src/core/signals.test.js diff --git a/src/core/signals.js b/src/core/signals.js new file mode 100644 index 000000000..d673b8cad --- /dev/null +++ b/src/core/signals.js @@ -0,0 +1,222 @@ +/** + * A minimal reactive signals implementation. + * + * Provides ``signal``, ``computed``, ``effect``, ``batch`` and ``untracked`` + * primitives with automatic dependency tracking. + * + * The public API is intentionally shaped after the TC39 signals proposal + * (https://github.com/tc39/proposal-signals) so that this module can be swapped + * for a native implementation once that lands in browsers. + * + * Effects are flushed in a microtask, so a burst of synchronous signal writes + * only re-runs each dependent effect once. + */ +import logging from "./logging"; + +const log = logging.getLogger("signals"); + +// The effect which is currently running and collecting dependencies. +let current_effect = null; + +// Effects scheduled to re-run on the next microtask flush. +const pending_effects = new Set(); +let flush_scheduled = false; + +// While > 0, effect flushing is deferred (see ``batch``). +let batch_depth = 0; + +function schedule_flush() { + if (flush_scheduled || batch_depth > 0) { + return; + } + flush_scheduled = true; + queueMicrotask(flush_effects); +} + +// Safety net against cyclic derivations that never settle. +const MAX_FLUSH_ITERATIONS = 1000; + +function flush_effects() { + flush_scheduled = false; + // Drain the queue within this microtask so cascades (e.g. a computed + // updating a downstream effect) settle in one flush instead of lagging a + // tick. Effects scheduled while running are picked up by the next iteration. + let iterations = 0; + while (pending_effects.size > 0) { + if (++iterations > MAX_FLUSH_ITERATIONS) { + pending_effects.clear(); + log.error( + "Aborting effect flush after too many iterations - likely a cyclic dependency." + ); + return; + } + const effects = [...pending_effects]; + pending_effects.clear(); + for (const eff of effects) { + eff._run(); + } + } +} + +class Signal { + constructor(value) { + this._value = value; + this._subscribers = new Set(); // effects depending on this signal + } + + get value() { + if (current_effect) { + // Track the dependency in both directions for cleanup. + this._subscribers.add(current_effect); + current_effect._deps.add(this); + } + return this._value; + } + + set value(new_value) { + if (Object.is(new_value, this._value)) { + // No change → no notification. This is the central loop-breaker for + // two-way bindings: a write-back of an equal value is a no-op. + return; + } + this._value = new_value; + // Copy the subscribers as the set may be mutated while scheduling. + for (const eff of [...this._subscribers]) { + pending_effects.add(eff); + } + schedule_flush(); + } + + // Read the current value without subscribing the running effect. + peek() { + return this._value; + } +} + +class Effect { + constructor(fn) { + this._fn = fn; + this._deps = new Set(); + this._disposed = false; + this._run(); + } + + _run() { + if (this._disposed) { + return; + } + this._cleanup(); + const previous = current_effect; + current_effect = this; + try { + this._fn(); + } catch (e) { + log.error("Error while running effect.", e); + } finally { + current_effect = previous; + } + } + + _cleanup() { + // Unsubscribe from all current dependencies before re-tracking. + for (const dep of this._deps) { + dep._subscribers.delete(this); + } + this._deps.clear(); + } + + dispose() { + this._disposed = true; + this._cleanup(); + pending_effects.delete(this); + } +} + +class Computed { + constructor(fn) { + this._signal = new Signal(undefined); + // An effect keeps the derived value up to date and propagates changes to + // anything reading the computed signal. + // NOTE: This is an eager computed - it recomputes whenever a dependency + // changes, even when nobody reads it. Good enough for v1; the TC39 + // proposal computeds are lazy. + this._effect = new Effect(() => { + this._signal.value = fn(); + }); + } + + get value() { + return this._signal.value; + } + + peek() { + return this._signal.peek(); + } + + dispose() { + this._effect.dispose(); + } +} + +/** + * Create a writable reactive value. + * @param {*} initial_value - The initial value of the signal. + * @returns {Signal} A signal with a ``value`` getter/setter and ``peek()``. + */ +function signal(initial_value) { + return new Signal(initial_value); +} + +/** + * Create a read-only signal derived from other signals. + * @param {function} fn - Function computing the derived value. + * @returns {Computed} A read-only signal with a ``value`` getter, ``peek()`` + * and ``dispose()``. + */ +function computed(fn) { + return new Computed(fn); +} + +/** + * Run ``fn`` and re-run it whenever any signal read during it changes. + * @param {function} fn - The effect callback. + * @returns {function} A dispose function which stops the effect. + */ +function effect(fn) { + const eff = new Effect(fn); + return () => eff.dispose(); +} + +/** + * Coalesce all signal writes performed in ``fn`` into a single effect flush. + * @param {function} fn - The callback performing the writes. + * @returns {*} The return value of ``fn``. + */ +function batch(fn) { + batch_depth++; + try { + return fn(); + } finally { + batch_depth--; + schedule_flush(); + } +} + +/** + * Run ``fn`` without subscribing the currently running effect to any signal + * read inside it. + * @param {function} fn - The callback to run untracked. + * @returns {*} The return value of ``fn``. + */ +function untracked(fn) { + const previous = current_effect; + current_effect = null; + try { + return fn(); + } finally { + current_effect = previous; + } +} + +export { signal, computed, effect, batch, untracked }; +export default { signal, computed, effect, batch, untracked }; diff --git a/src/core/signals.test.js b/src/core/signals.test.js new file mode 100644 index 000000000..ef62e606c --- /dev/null +++ b/src/core/signals.test.js @@ -0,0 +1,186 @@ +import { signal, computed, effect, batch, untracked } from "./signals"; + +// A microtask flush helper: effects are batched and run in a microtask. +const flush = () => Promise.resolve(); + +describe("core/signals", function () { + describe("1 - signal", function () { + it("1.1 - stores and returns its value", function () { + const count = signal(1); + expect(count.value).toBe(1); + count.value = 2; + expect(count.value).toBe(2); + }); + + it("1.2 - peek() reads without subscribing", async function () { + const count = signal(1); + let runs = 0; + effect(() => { + runs++; + count.peek(); + }); + await flush(); + expect(runs).toBe(1); + + count.value = 2; + await flush(); + // The effect did not subscribe via peek(), so it does not re-run. + expect(runs).toBe(1); + }); + }); + + describe("2 - effect", function () { + it("2.1 - runs immediately and on dependency change", async function () { + const count = signal(1); + const seen = []; + effect(() => seen.push(count.value)); + + // Effect runs synchronously on creation. + expect(seen).toEqual([1]); + + count.value = 2; + await flush(); + expect(seen).toEqual([1, 2]); + }); + + it("2.2 - coalesces multiple writes into one re-run", async function () { + const count = signal(0); + let runs = 0; + effect(() => { + runs++; + count.value; + }); + expect(runs).toBe(1); + + count.value = 1; + count.value = 2; + count.value = 3; + await flush(); + // The three writes are flushed together → a single re-run. + expect(runs).toBe(2); + expect(count.value).toBe(3); + }); + + it("2.3 - does not re-run on equal-value writes", async function () { + const count = signal(1); + let runs = 0; + effect(() => { + runs++; + count.value; + }); + await flush(); + expect(runs).toBe(1); + + count.value = 1; // same value (Object.is) → no notification + await flush(); + expect(runs).toBe(1); + }); + + it("2.4 - dispose() stops the effect", async function () { + const count = signal(1); + let runs = 0; + const dispose = effect(() => { + runs++; + count.value; + }); + await flush(); + expect(runs).toBe(1); + + dispose(); + count.value = 2; + await flush(); + expect(runs).toBe(1); + }); + + it("2.5 - re-tracks dependencies on each run", async function () { + const toggle = signal(true); + const a = signal("a"); + const b = signal("b"); + const seen = []; + effect(() => seen.push(toggle.value ? a.value : b.value)); + expect(seen).toEqual(["a"]); + + // While toggle is true, b is not a dependency. + b.value = "b2"; + await flush(); + expect(seen).toEqual(["a"]); + + toggle.value = false; + await flush(); + expect(seen).toEqual(["a", "b2"]); + + // Now a is no longer a dependency. + a.value = "a2"; + await flush(); + expect(seen).toEqual(["a", "b2"]); + }); + }); + + describe("3 - computed", function () { + it("3.1 - derives from other signals", async function () { + const first = signal("Jane"); + const last = signal("Doe"); + const full = computed(() => `${first.value} ${last.value}`); + expect(full.value).toBe("Jane Doe"); + + first.value = "John"; + await flush(); + expect(full.value).toBe("John Doe"); + }); + + it("3.2 - is reactive as an effect dependency", async function () { + const count = signal(2); + const doubled = computed(() => count.value * 2); + const seen = []; + effect(() => seen.push(doubled.value)); + expect(seen).toEqual([4]); + + count.value = 5; + await flush(); + expect(seen).toEqual([4, 10]); + }); + }); + + describe("4 - batch", function () { + it("4.1 - defers flushing until the batch ends", async function () { + const a = signal(1); + const b = signal(2); + let runs = 0; + effect(() => { + runs++; + a.value + b.value; + }); + expect(runs).toBe(1); + + batch(() => { + a.value = 10; + b.value = 20; + }); + await flush(); + expect(runs).toBe(2); + }); + }); + + describe("5 - untracked", function () { + it("5.1 - reads without creating a dependency", async function () { + const tracked = signal(1); + const hidden = signal(1); + let runs = 0; + effect(() => { + runs++; + tracked.value; + untracked(() => hidden.value); + }); + await flush(); + expect(runs).toBe(1); + + hidden.value = 2; + await flush(); + expect(runs).toBe(1); // not a dependency + + tracked.value = 2; + await flush(); + expect(runs).toBe(2); + }); + }); +}); From 3d201387a16e3e7ee4643aaeada5ed09535fb434 Mon Sep 17 00:00:00 2001 From: Johannes Raggam Date: Wed, 3 Jun 2026 23:13:02 +0200 Subject: [PATCH 2/2] feat(pat-bind): Add new pattern for data binding. --- index.html | 6 + src/pat/bind/bind.js | 271 ++++++++++++++++++++++++++++++++++ src/pat/bind/bind.test.js | 164 ++++++++++++++++++++ src/pat/bind/documentation.md | 103 +++++++++++++ src/pat/bind/index.html | 183 +++++++++++++++++++++++ src/patterns.js | 1 + 6 files changed, 728 insertions(+) create mode 100644 src/pat/bind/bind.js create mode 100644 src/pat/bind/bind.test.js create mode 100644 src/pat/bind/documentation.md create mode 100644 src/pat/bind/index.html diff --git a/index.html b/index.html index 12fe5f6a7..80ece4eeb 100644 --- a/index.html +++ b/index.html @@ -23,6 +23,12 @@

Behavioural

title="Inject history" >Inject historyunknown + Bindβ el.textContent, + write: (v) => { + el.textContent = v ?? ""; + }, + event: null, + observe: "content", + }; + } + + if (accessor === "::html") { + return { + read: () => el.innerHTML, + write: (v) => { + el.innerHTML = sanitize(v ?? ""); + }, + event: null, + observe: "content", + }; + } + + const attr_match = accessor.match(/^\[\s*([a-z][a-z0-9_-]*)\s*\]$/i); + if (attr_match) { + const attr = attr_match[1]; + // For live form-control state, ``[value]`` and ``[checked]`` map to the + // IDL property and the native ``input``/``change`` event, not to the + // static attribute. + const use_property = (attr === "value" || attr === "checked") && attr in el; + if (use_property) { + return { + read: () => el[attr], + write: (v) => { + el[attr] = attr === "checked" ? Boolean(v) : v ?? ""; + }, + event: attr === "checked" ? "change" : "input", + observe: null, + }; + } + return { + read: () => el.getAttribute(attr), + write: (v) => { + if (v === null || v === undefined || v === false) { + el.removeAttribute(attr); + } else { + el.setAttribute(attr, String(v)); + } + }, + event: null, + observe: `attribute:${attr}`, + }; + } + + log.error(`Invalid bind accessor: "${accessor}".`, el); + return null; +} + +/** + * The MutationObserver config for a source accessor that has no native event. + */ +function mutation_config(observe) { + if (observe === "content") { + return { childList: true, characterData: true, subtree: true }; + } + if (observe.startsWith("attribute:")) { + return { attributes: true, attributeFilter: [observe.slice("attribute:".length)] }; + } + return {}; +} + +/** + * Default binding direction when not given explicitly: form controls bound to + * their value/checked default to two-way, everything else to ``target``. + */ +function infer_direction(el, accessor) { + if (dom.is_input(el) && accessor.event) { + return "both"; + } + return "target"; +} + +class Pattern extends BasePattern { + static name = "bind"; + static trigger = ".pat-bind"; + static parser = parser; + + // One binding per ``&&``-separated config; ``this.options`` becomes an array. + parser_multiple = true; + // Each element defines its own bindings; do not inherit from ancestors. + parser_inherit = false; + + async init() { + this._disposers = []; // effect dispose functions + this._observers = []; // MutationObservers + this._listener_ids = []; // event listener ids, for cleanup + + const bindings = Array.isArray(this.options) ? this.options : [this.options]; + + // Lazily load DOMPurify only when an ``::html`` accessor is in use. + let sanitize = (v) => v; + if (bindings.some((binding) => binding.value === "::html")) { + const DOMPurify = (await import("dompurify")).default; + sanitize = (v) => DOMPurify.sanitize(v ?? ""); + } + + for (const binding of bindings) { + this.setup_binding(binding, sanitize); + } + } + + setup_binding(binding, sanitize) { + const key = binding.key; + if (!key) { + log.warn("Ignoring a pat-bind binding without a `key`.", this.el); + return; + } + + const accessor = resolve_accessor(this.el, binding.value, sanitize); + if (!accessor) { + return; + } + + const direction = binding.direction || infer_direction(this.el, accessor); + const sig = get_channel(this.el, key); + + if (direction === "target" || direction === "both") { + this.setup_target(sig, accessor); + } + if (direction === "source" || direction === "both") { + this.setup_source(sig, accessor, key); + } + } + + // Channel → element: keep the element's accessor in sync with the signal. + setup_target(sig, accessor) { + const dispose = effect(() => { + const value = sig.value; + if (value === undefined) { + // Channel not seeded yet; leave the server-rendered DOM as-is. + return; + } + if (Object.is(accessor.read(), value)) { + // Already in sync. Avoids redundant writes (e.g. resetting the + // caret of an input) and breaks two-way feedback loops. + return; + } + accessor.write(value); + }); + this._disposers.push(dispose); + } + + // Element → channel: push the element's accessor value into the signal. + setup_source(sig, accessor, key) { + // Seed the channel from the element's current value. + sig.value = accessor.read(); + + // The signal's own equal-value guard stops the + // signal → write → observer → read → signal feedback loop. + const handler = () => { + sig.value = accessor.read(); + }; + + if (accessor.event) { + const id = `pat-bind--${key}--${this.uuid}`; + events.add_event_listener(this.el, accessor.event, id, handler); + this._listener_ids.push(id); + } else if (accessor.observe) { + const observer = new MutationObserver(handler); + observer.observe(this.el, mutation_config(accessor.observe)); + this._observers.push(observer); + } + } + + destroy() { + for (const dispose of this._disposers) { + dispose(); + } + for (const observer of this._observers) { + observer.disconnect(); + } + for (const id of this._listener_ids) { + events.remove_event_listener(this.el, id); + } + super.destroy(); + } +} + +registry.register(Pattern); + +export default Pattern; diff --git a/src/pat/bind/bind.test.js b/src/pat/bind/bind.test.js new file mode 100644 index 000000000..e3555cd5a --- /dev/null +++ b/src/pat/bind/bind.test.js @@ -0,0 +1,164 @@ +import Pattern from "./bind"; +import events from "../../core/events"; +import utils from "../../core/utils"; + +// MutationObserver callbacks and effects both run as microtasks; give them a +// couple of ticks to settle. +const tick = () => utils.timeout(1); + +describe("pat-bind", function () { + afterEach(function () { + document.body.innerHTML = ""; + }); + + describe("1 - source → target", function () { + it("1.1 - updates a text target when the source select changes", async function () { + document.body.innerHTML = ` + + + `; + const select = document.querySelector("select"); + const span = document.querySelector("span"); + + const source = new Pattern(select); + const target = new Pattern(span); + await events.await_pattern_init(source); + await events.await_pattern_init(target); + + // The target is seeded from the source's initial value. + await tick(); + expect(span.textContent).toBe("red"); + + select.value = "green"; + select.dispatchEvent(events.change_event()); + select.dispatchEvent(events.input_event()); + await tick(); + + expect(span.textContent).toBe("green"); + }); + + it("1.2 - binds to an attribute target", async function () { + document.body.innerHTML = ` + + link + `; + const input = document.querySelector("input"); + const anchor = document.querySelector("a"); + + const source = new Pattern(input); + const target = new Pattern(anchor); + await events.await_pattern_init(source); + await events.await_pattern_init(target); + await tick(); + + expect(anchor.getAttribute("href")).toBe("/profile"); + + input.value = "/dashboard"; + input.dispatchEvent(events.input_event()); + await tick(); + + expect(anchor.getAttribute("href")).toBe("/dashboard"); + }); + }); + + describe("2 - two-way binding", function () { + it("2.1 - keeps two inputs on the same channel in sync", async function () { + document.body.innerHTML = ` + + + `; + const a = document.querySelector("#a"); + const b = document.querySelector("#b"); + + const pa = new Pattern(a); + const pb = new Pattern(b); + await events.await_pattern_init(pa); + await events.await_pattern_init(pb); + await tick(); + + // b is seeded from the channel (which a seeded with "start"). + expect(b.value).toBe("start"); + + // Typing into b propagates back to a (two-way). + b.value = "changed"; + b.dispatchEvent(events.input_event()); + await tick(); + + expect(a.value).toBe("changed"); + }); + }); + + describe("3 - multiple bindings per element", function () { + it("3.1 - binds text and an attribute on one element", async function () { + document.body.innerHTML = ` + + +
+ `; + const out = document.querySelector("#out"); + + for (const el of document.querySelectorAll(".pat-bind")) { + const instance = new Pattern(el); + await events.await_pattern_init(instance); + } + await tick(); + + expect(out.textContent).toBe("Hello"); + expect(out.getAttribute("class")).toContain("active"); + }); + }); + + describe("4 - scope", function () { + it("4.1 - isolates channels per scope root", async function () { + document.body.innerHTML = ` +
+ + +
+
+ + +
+ `; + for (const el of document.querySelectorAll(".pat-bind")) { + const instance = new Pattern(el); + await events.await_pattern_init(instance); + } + await tick(); + + const spans = document.querySelectorAll("span"); + // Each scope keeps its own "v" channel. + expect(spans[0].textContent).toBe("one"); + expect(spans[1].textContent).toBe("two"); + }); + }); + + describe("5 - direction", function () { + it("5.1 - a target does not write back to the channel", async function () { + document.body.innerHTML = ` + + + `; + const [source, target] = document.querySelectorAll("input"); + + for (const el of document.querySelectorAll(".pat-bind")) { + const instance = new Pattern(el); + await events.await_pattern_init(instance); + } + await tick(); + + expect(target.value).toBe("from-source"); + + // Changing the target must NOT propagate back to the source. + target.value = "edited"; + target.dispatchEvent(events.input_event()); + await tick(); + + expect(source.value).toBe("from-source"); + }); + }); +}); diff --git a/src/pat/bind/documentation.md b/src/pat/bind/documentation.md new file mode 100644 index 000000000..079f96d41 --- /dev/null +++ b/src/pat/bind/documentation.md @@ -0,0 +1,103 @@ +## Description + +The _bind_ pattern provides declarative data binding between DOM elements. +Select a value in one place and have a label, attribute or another field update +elsewhere - without writing any JavaScript. + +## Documentation + +Binding works through named _channels_. Every `pat-bind` element ties one of its +_accessors_ (a form value, an attribute, its text or its HTML) to a channel. +Elements sharing a channel stay in sync. + +A minimal example - a select drives a label: + + + + + +When the select changes, the span's text follows. + +### Configuration options + +Each binding is configured through `data-pat-bind` with the following keys: + +- `key` (**required**): the channel name. Elements with the same `key` (within + the same scope, see below) are bound together. +- `value`: the _accessor_ - which part of this element is bound. One of: + - `[]`: an attribute value, e.g. `[value]`, `[href]`, + `[class]`, `[aria-pressed]`. For form controls, `[value]` and + `[checked]` bind to the live form state (and react to `input` / + `change`), not to the static HTML attribute. + - `::text`: the element's text content (`textContent`). + - `::html`: the element's HTML content (`innerHTML`). Values are sanitized + with DOMPurify on write. + - _omitted_: inferred from the element. Form controls bind to their value + (or `checked` for checkboxes and radios); everything else binds to + `::text`. +- `direction`: the data-flow direction. One of: + - `source`: the element writes into the channel (it is an input). + - `target`: the channel writes into the element (it is a display). + - `both`: two-way binding. + - _omitted_: inferred. Form controls bound to their value/checked default + to `both`; everything else defaults to `target`. + +### Multiple bindings on one element + +Separate several bindings with `&&`, just like _pat-inject_: + +
+ +This element shows the `user_name` channel as its text and mirrors the `theme` +channel onto its `class` attribute. + +### Two-way binding + +Form controls are two-way by default, so two fields on the same channel mirror +each other: + + + + +Typing in either input updates the other. + +To bind a non-form element two-way - for example a `contenteditable` region - +request it explicitly: + +
+ +### Scope + +By default all channels live in a single, document-wide namespace. To reuse the +same channel name in independent regions - the typical case being repeated +content such as a list of cards - mark a container with `data-pat-bind-scope`. +Channel lookups resolve to the nearest scope ancestor, falling back to the +document. + +
+ + +
+ + +### Notes + +- Channel values are strings, except `[checked]` which is a boolean. +- Targets are only written once a channel has a value, so server-rendered + content is left untouched until a source provides data. +- Two-way binding on `::text` / `::html` relies on a `MutationObserver` and is + intended for editable elements; for plain displays prefer a `target` + binding. + +### Relation to other patterns + +_pat-bind_ is built on the reactive primitives in `core/signals` (a small +`signal` / `computed` / `effect` implementation shaped after the TC39 signals +proposal). The signals are an implementation detail - the page author only ever +writes markup. diff --git a/src/pat/bind/index.html b/src/pat/bind/index.html new file mode 100644 index 000000000..42715c61f --- /dev/null +++ b/src/pat/bind/index.html @@ -0,0 +1,183 @@ + + + + pat-bind + + + + + +

pat-bind

+

+ Declarative data binding between DOM elements. Elements sharing a + channel (the key) stay in sync — no JavaScript + required. +

+ +
+

A source drives a target

+

Pick a colour; the label and the swatch follow.

+
+
+
+ +

+ You picked: + +

+

+ … and it is mirrored onto a + title attribute: + hover me +

+
+
+
+
+ +
+

Two-way binding

+

+ Form controls on the same channel mirror each other. Type in + either field. +

+
+
+
+ + +

+ Hello, + + ! +

+
+
+
+
+ +
+

Binding an attribute

+

A checkbox drives the disabled state of a button.

+
+
+
+ + +
+
+
+
+ +
+

Editable HTML (::html)

+

+ Edit the region below; its sanitized HTML is mirrored into the + preview. The ::html accessor sanitizes with + DOMPurify on write. +

+
+
+ Try bold or italic text… +
+

Preview:

+
+
+
+
+ +
+

Scope

+

+ Each card is its own scope (data-pat-bind-scope), so + the reused price channel stays local to the card. +

+
+
+

Card A

+ +

+ € +

+
+
+

Card B

+ +

+ € +

+
+
+
+ + diff --git a/src/patterns.js b/src/patterns.js index 7537e47df..aafde2c1a 100644 --- a/src/patterns.js +++ b/src/patterns.js @@ -12,6 +12,7 @@ import "./pat/auto-scale/auto-scale"; import "./pat/auto-submit/auto-submit"; import "./pat/auto-suggest/auto-suggest"; import "./pat/autofocus/autofocus"; +import "./pat/bind/bind"; import "./pat/breadcrumbs/breadcrumbs"; import "./pat/bumper/bumper"; import "./pat/calendar/calendar";