access-input/demo/stack.html at main · LE-VAI/access-input · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Reading with a consent gate — three libraries, one interface</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@designesy/read-along@0.1.3/src/read-along.css">
<style>
  :root {
    --bg: #0b0c0f;
    --surface: #181a1e;
    --border: #2a2d33;
    --text: #f5f5f7;
    --dim: #9a9aa5;
    --amber: #ffc400;
    --ok: #34c759;
    --blocked: #ff453a;
    --ra-highlight: rgb(255 196 0 / 0.42);
    --ra-accent: #ffc400;
  }
  * { box-sizing: border-box; margin: 0; }
  body {
    background: var(--bg); color: var(--text);
    font: 16px/1.65 ui-sans-serif, system-ui, sans-serif;
    padding: clamp(18px, 4.5vw, 52px);
    max-width: 860px; margin-inline: auto;
  }
  .eyebrow {
    font: 600 12px/1 ui-sans-serif, system-ui, sans-serif;
    letter-spacing: 0.14em; text-transform: uppercase; color: var(--amber);
    margin-bottom: 14px;
  }
  h1 { font-size: clamp(23px, 4vw, 32px); letter-spacing: -0.02em; margin-bottom: 12px; }
  .sub { color: var(--dim); font-size: 15px; margin-bottom: 28px; max-width: 64ch; }

  .panel {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 14px; padding: 22px; margin-bottom: 18px;
  }
  .panel h2 {
    font: 600 12px/1 inherit; letter-spacing: 0.07em; text-transform: uppercase;
    color: var(--dim); margin-bottom: 14px;
  }

  /* -- the stack diagram ---------------------------------------------- */
  .stack { font: 12.5px/1.85 ui-monospace, monospace; }
  .stack .layer {
    display: grid; grid-template-columns: 130px 1fr auto;
    gap: 10px; align-items: center;
    padding: 7px 0; border-bottom: 1px solid var(--border);
  }
  .stack .layer:last-child { border-bottom: 0; }
  .stack .name { color: var(--amber); font-weight: 600; }
  .stack .what { color: var(--dim); }
  .stack .state {
    font-weight: 600; padding: 2px 9px; border-radius: 999px;
    border: 1px solid var(--border); font-size: 11px; white-space: nowrap;
  }
  .stack .state[data-live="yes"] { color: var(--ok); border-color: color-mix(in oklab, var(--ok) 45%, transparent); }
  .stack .state[data-live="no"] { color: var(--blocked); border-color: color-mix(in oklab, var(--blocked) 45%, transparent); }

  /* -- consent gate ---------------------------------------------------- */
  .gate {
    display: flex; gap: 14px; align-items: center; flex-wrap: wrap;
    padding: 14px 16px; border-radius: 11px; margin-bottom: 14px;
    border: 1px solid color-mix(in oklab, var(--blocked) 35%, transparent);
    background: color-mix(in oklab, var(--blocked) 7%, transparent);
  }
  .gate[data-granted="yes"] {
    border-color: color-mix(in oklab, var(--ok) 35%, transparent);
    background: color-mix(in oklab, var(--ok) 7%, transparent);
  }
  .gate .verdict { font-weight: 620; }
  .gate .verdict[data-granted="no"] { color: var(--blocked); }
  .gate .verdict[data-granted="yes"] { color: var(--ok); }
  .gate .why { color: var(--dim); font-size: 13px; }

  button {
    background: transparent; color: var(--text); border: 1px solid var(--border);
    border-radius: 999px; padding: 7px 15px; font: 500 13px/1 inherit; cursor: pointer;
  }
  button:hover { border-color: var(--dim); }
  button:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; }
  button[aria-pressed="true"] { background: var(--amber); color: #0b0c0f; border-color: var(--amber); }
  button[data-primary] { border-color: color-mix(in oklab, var(--ok) 50%, transparent); }
  button:disabled { opacity: 0.4; cursor: not-allowed; }

  .row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-bottom: 12px; }
  .status { font-variant-numeric: tabular-nums; color: var(--dim); font-size: 13px; }
  .hint { font-size: 13.5px; color: var(--dim); margin-top: 10px; }

  /* -- dwell targets --------------------------------------------------- */
  .ra-dwell-word {
    position: relative; border-radius: 3px;
    background-image: linear-gradient(
      to right,
      color-mix(in oklab, #ffc400 40%, transparent) calc(var(--dwell-progress, 0) * 100%),
      transparent calc(var(--dwell-progress, 0) * 100%)
    );
  }
  .ra-dwell-word[data-dwell-focus] {
    outline: 1px dashed color-mix(in oklab, #ffc400 65%, transparent);
    outline-offset: 2px;
  }
  .ra-dwell-word.ra-spent { background-image: none; }
  body[data-scanning] .ra-dwell-word[data-dwell-focus] {
    background-color: color-mix(in oklab, #ffc400 24%, transparent);
  }
  /* When consent is withheld the surface is visibly inert — not merely
     non-functional. A user should be able to SEE that nothing is being read. */
  body[data-gated] .ra-dwell-word { background-image: none; outline: none; }
  body[data-gated] read-along { opacity: 0.55; filter: saturate(0.4); }

  read-along { display: block; transition: opacity 180ms linear; }
  .reading-text { font-size: 17.5px; line-height: 1.95; }

  .log {
    font: 12px/1.6 ui-monospace, monospace; color: var(--dim);
    max-height: 160px; overflow-y: auto; white-space: pre-wrap;
  }
  kbd {
    font: 11px ui-monospace, monospace; background: #23262c;
    border: 1px solid var(--border); border-radius: 4px; padding: 1px 5px;
  }
  .visually-hidden {
    position: absolute; width: 1px; height: 1px; margin: -1px;
    overflow: hidden; clip-path: inset(50%); white-space: nowrap;
  }
</style>
</head>
<body data-gated>
<p class="eyebrow">Three libraries · one interface · all published</p>
<h1>Reading with a consent gate</h1>
<p class="sub">The full stack running at once. A signal source drives the reading surface, and a
consent record decides whether the signal may be read at all. Nothing is transmitted by any layer —
that is the claim, and you can verify it in your network panel.</p>

<div class="panel">
  <h2>The stack, live</h2>
  <div class="stack" id="stack"></div>
</div>

<div class="panel">
  <h2>Consent — the gate</h2>
  <div class="gate" id="gate">
    <span class="verdict" id="gateVerdict">Blocked</span>
    <span class="why" id="gateWhy"></span>
    <button id="grantBtn" data-primary>Grant: read my input signal</button>
    <button id="withdrawBtn">Withdraw</button>
    <button id="eraseBtn">Erase record</button>
  </div>
  <p class="hint" id="gateHint">
    Nothing on this page can read your input until you grant it. Try dwelling on a word now — it will not respond.
  </p>
</div>

<div class="panel">
  <h2>Input</h2>
  <div class="row">
    <button id="m-pointer" aria-pressed="true">Pointer (dwell)</button>
    <button id="m-switch" aria-pressed="false">Single switch (scan)</button>
    <button id="m-keyboard" aria-pressed="false">Keyboard (arrows)</button>
    <button id="m-external" aria-pressed="false">External device</button>
  </div>
  <div class="row">
    <label class="status">Dwell <input id="dwell-range" type="range" min="100" max="1200" step="25" value="600" aria-label="Dwell time in milliseconds"> <span id="dwell-val">600ms</span></label>
    <span class="status" id="stats">activations 0 · dwell 600ms</span>
  </div>
  <p class="hint" id="mode-hint">Rest the pointer on a word until the amber fill completes — the reading starts from that word.</p>
  <div class="row" id="ext-controls" hidden>
    <span class="status">External device simulated:</span>
    <button id="ext-next">focus next word</button>
    <button id="ext-select">select</button>
    <button id="ext-cancel">cancel</button>
  </div>
</div>

<div class="panel">
  <h2>Reading surface — the real component</h2>
  <read-along id="reader" rate="0.95" seekable>
    <h3 style="font-size:19px;margin-bottom:10px">Reading, for people who need the words to keep up</h3>
    <p class="reading-text">Reading while listening helps because the eye and the ear reinforce each other. The words stay visible while the voice moves through them. For a reader who needs support, that pairing is not a convenience — it is the difference between finishing the page and giving up on it.</p>
    <p class="reading-text">What has been missing is a way to reach it without a mouse. Rest on a word and the reading begins there.</p>
  </read-along>
</div>

<div class="panel">
  <h2>Consent record on this device</h2>
  <div class="log" id="consentFacts"></div>
</div>

<div class="panel">
  <h2>Event log</h2>
  <div class="log" id="log"></div>
</div>
<p class="visually-hidden" id="live" aria-live="polite"></p>

<script type="module">
// Three independently published packages, loaded from their CDNs. The demo runs
// as a static page with no build step — which is the point: they compose
// through public APIs and nothing else.
import { DwellEngine, SignalBridge, PointerSource, SwitchSource, KeyboardSource, ExternalSource, tagWords }
  from 'https://cdn.jsdelivr.net/npm/access-input@0.1.4/src/index.js';
import { ConsentManager, PURPOSES, noticeVersion }
  from 'https://cdn.jsdelivr.net/npm/neural-consent@0.1.0/src/index.js';
await import('https://cdn.jsdelivr.net/npm/@designesy/read-along@0.1.3/src/read-along.js');

const reader = document.getElementById('reader');
const logEl = document.getElementById('log');
const liveEl = document.getElementById('live');
const stackEl = document.getElementById('stack');
const gateEl = document.getElementById('gate');
const gateVerdict = document.getElementById('gateVerdict');
const gateWhy = document.getElementById('gateWhy');
const gateHint = document.getElementById('gateHint');
const statsEl = document.getElementById('stats');
const dwellRange = document.getElementById('dwell-range');
const dwellVal = document.getElementById('dwell-val');
const extControls = document.getElementById('ext-controls');
const consentFacts = document.getElementById('consentFacts');

const PURPOSE = PURPOSES.ACQUIRE_SIGNAL.id;

/**
 * THE CONSENT GATE.
 *
 * This manager is passed to access-input's SignalBridge, which consults it
 * before forwarding ANY event from the source. The bridge fails closed: no
 * grant means the signal is never read, and a withdrawal mid-dwell cancels
 * the activation in flight.
 */
const consent = new ConsentManager({ storage: localStorage, validDays: 365 });

const log = (msg) => {
  const t = new Date().toLocaleTimeString('en-US', { hour12: false });
  logEl.textContent = `${t}  ${msg}\n` + logEl.textContent;
};
const announce = (m) => { liveEl.textContent = m; };

let host = null, source = null, bridge = null, mode = 'pointer';
let external = null, extIndex = -1;
let words = [];

// --- reading surface: tag first, then re-prepare read-along ----------------
// tagWords REPLACES the text nodes read-along cached its ranges from, so the
// component must re-prepare or the karaoke highlight silently stops painting.
words = tagWords(reader);
reader._prepared = false;
reader._prepare();
log(`tagged ${words.length} word targets`);

// --- the stack readout -----------------------------------------------------
function renderStack() {
  const granted = consent.isGranted(PURPOSE);
  const layers = [
    { name: 'neural-consent', what: 'decides whether the signal may be read', live: granted },
    { name: 'access-input', what: 'turns the signal into a selection', live: granted },
    { name: 'read-along', what: 'reads from the chosen word', live: reader.state === 'playing' || granted },
  ];
  stackEl.textContent = '';
  for (const l of layers) {
    const row = document.createElement('div');
    row.className = 'layer';
    const n = document.createElement('span'); n.className = 'name'; n.textContent = l.name;
    const w = document.createElement('span'); w.className = 'what'; w.textContent = l.what;
    const s = document.createElement('span');
    s.className = 'state';
    s.dataset.live = l.live ? 'yes' : 'no';
    s.textContent = l.live ? 'live' : 'blocked';
    row.append(n, w, s);
    stackEl.appendChild(row);
  }
}

// --- consent UI ------------------------------------------------------------
function renderConsent() {
  const granted = consent.isGranted(PURPOSE);
  const state = consent.stateOf(PURPOSE);

  gateEl.dataset.granted = granted ? 'yes' : 'no';
  gateVerdict.dataset.granted = granted ? 'yes' : 'no';
  gateVerdict.textContent = granted ? 'Granted' : (state === 'withdrawn' ? 'Withdrawn' : 'Blocked');
  gateWhy.textContent = granted
    ? `until ${(consent.record.purposes[PURPOSE]?.validUntil ?? 'n/a').slice(0, 10)}`
    : 'the input layer cannot read anything';

  // The surface LOOKS inert when gated — a user should be able to see that
  // nothing is being read, not merely infer it from a missing response.
  document.body.toggleAttribute('data-gated', !granted);

  gateHint.textContent = granted
    ? 'Granted. Rest on a word and the reading starts there. Withdraw at any point — an in-flight dwell is cancelled immediately.'
    : 'Nothing on this page can read your input until you grant it. Try dwelling on a word now — it will not respond.';

  const r = consent.record;
  consentFacts.textContent = [
    `record     ${r.recordId.slice(0, 18)}…`,
    `purpose    acquire_signal`,
    `state      ${state ?? 'not decided'}`,
    `recipients ${r.handling.recipientsDeclaration}`,
    `storage    ${r.handling.storage}`,
    `events     ${r.events.length}`,
    `chain      ${r.verify().ok ? 'intact' : 'MODIFIED'}`,
  ].join('\n');

  renderStack();
}

document.getElementById('grantBtn').addEventListener('click', () => {
  consent.grant(PURPOSE, { noticeVersion: noticeVersion(), language: 'en' });
  log('CONSENT granted: acquire_signal');
  announce('Consent granted.');
});
document.getElementById('withdrawBtn').addEventListener('click', () => {
  if (!consent.isGranted(PURPOSE)) return;
  consent.withdraw(PURPOSE);
  log('CONSENT withdrawn — gate closed, any dwell in flight was cancelled');
  announce('Consent withdrawn.');
});
document.getElementById('eraseBtn').addEventListener('click', () => {
  consent.erase();
  log('consent record erased');
  announce('Record erased.');
});
consent.onChange(renderConsent);

// --- the input stack -------------------------------------------------------
function updateStats() {
  const s = host?.dwell?.stats ?? { activations: 0, dwellMs: 600 };
  statsEl.textContent = `activations ${s.activations} · dwell ${s.dwellMs}ms`;
  renderStack();
}

function clearSpent() {
  for (const el of reader.querySelectorAll('.ra-spent')) el.classList.remove('ra-spent');
}

function rebuild() {
  bridge?.stop();
  source?.stop();
  document.body.removeAttribute('data-scanning');
  extControls.hidden = mode !== 'external';

  const dwell = new DwellEngine({
    dwellMs: Number(dwellRange.value),
    lockOnMs: 150,
    onProgress: (id, r) => {
      const el = reader.querySelector(`[data-dwell-target="${id}"]`);
      if (el) el.style.setProperty('--dwell-progress', String(r));
    },
    onActivate: (id) => {
      const el = reader.querySelector(`[data-dwell-target="${id}"]`);
      if (el) el.classList.add('ra-spent');
      el?.style.removeProperty('--dwell-progress');
    },
    onCancel: (id) => {
      const el = reader.querySelector(`[data-dwell-target="${id}"]`);
      el?.classList.remove('ra-spent');
      el?.style.removeProperty('--dwell-progress');
    },
  });

  const common = {
    onFocus: (id) => {
      for (const el of reader.querySelectorAll('[data-dwell-focus]')) el.removeAttribute('data-dwell-focus');
      if (id) reader.querySelector(`[data-dwell-target="${id}"]`)?.setAttribute('data-dwell-focus', '');
      for (const el of reader.querySelectorAll('[data-dwell-target]')) {
        if (el.getAttribute('data-dwell-target') !== id) el.style.removeProperty('--dwell-progress');
      }
    },
  };

  if (mode === 'pointer') {
    source = new PointerSource(reader);
    bridge = new SignalBridge({ source, dwell, mode: 'dwell', ...common });
  } else if (mode === 'switch') {
    document.body.setAttribute('data-scanning', '');
    source = new SwitchSource({ keys: [' ', 'Enter'], autoScan: true, scanMs: 900, firstItemDelayMs: 1200 });
    source.attach(reader);
    bridge = new SignalBridge({ source, dwell, mode: 'direct', ...common });
  } else if (mode === 'keyboard') {
    source = new KeyboardSource(reader);
    bridge = new SignalBridge({ source, dwell, mode: 'direct', ...common });
  } else {
    external = new ExternalSource();
    extIndex = -1;
    source = external;
    bridge = new SignalBridge({ source, dwell, mode: 'dwell', ...common });
  }

  /**
   * THE TWO WIRES THAT MAKE THIS A STACK.
   *
   * 1. The consent gate goes to the BRIDGE, so it is enforced per event —
   *    including a withdrawal mid-dwell.
   * 2. An activation becomes a read-along seek, deferred one frame so
   *    play() finishes binding before seekToToken restarts the speech.
   */
  const userActivate = bridge.onActivate;
  bridge.onActivate = (id, meta) => {
    userActivate?.(id, meta);
    const i = Number(String(id).replace(/^w/, ''));
    if (Number.isNaN(i) || !words[i]) return;
    log(`ACTIVATE "${words[i].text}" (token ${i}, via ${meta?.via ?? '?'}) → seek`);
    if (reader.state !== 'playing') reader.play();
    requestAnimationFrame(() => reader.seekToToken(i));
    clearSpent();
  };

  // Attach the gate AFTER the activation override so it wraps everything.
  bridge.consent = consent;
  bridge.consentPurpose = PURPOSE;

  host = { dwell };
  bridge.start();
  updateStats();
  log(`mode → ${mode}`);
}

dwellRange.addEventListener('input', () => {
  dwellVal.textContent = `${dwellRange.value}ms`;
  host?.dwell?.setDwell(Number(dwellRange.value));
  updateStats();
});

const modeButtons = {
  pointer: document.getElementById('m-pointer'),
  switch: document.getElementById('m-switch'),
  keyboard: document.getElementById('m-keyboard'),
  external: document.getElementById('m-external'),
};
const hints = {
  pointer: 'Rest the pointer on a word until the amber fill completes — the reading starts from that word.',
  switch: 'Auto-scan is running. Press Space to choose, then Space again to pick the word.',
  keyboard: 'Use arrows or Tab to move, Enter to select. Home/End jump to the ends.',
  external: 'A device outside the page drives it: focus, select, cancel. This is the BCI/EMG path.',
};
for (const [name, btn] of Object.entries(modeButtons)) {
  btn.addEventListener('click', () => {
    mode = name;
    for (const [n, b] of Object.entries(modeButtons)) b.setAttribute('aria-pressed', String(n === name));
    document.getElementById('mode-hint').textContent = hints[name];
    rebuild();
  });
}

document.getElementById('ext-next').addEventListener('click', () => {
  if (!external) return;
  const els = [...reader.querySelectorAll('[data-dwell-target]')];
  extIndex = (extIndex + 1) % els.length;
  external.focus(els[extIndex].getAttribute('data-dwell-target'));
});
document.getElementById('ext-select').addEventListener('click', () => {
  if (!external || extIndex < 0) return;
  const els = [...reader.querySelectorAll('[data-dwell-target]')];
  external.select(els[extIndex].getAttribute('data-dwell-target'));
});
document.getElementById('ext-cancel').addEventListener('click', () => external?.cancel('device'));

/**
 * The heartbeat. The dwell engine never reads a clock — the host ticks it, and
 * a pointer that stops moving still needs hold() calls or the dwell stalls.
 * rAF is the right cadence: it pauses in background tabs, which is exactly
 * what the engine's clock-gap guard wants to see.
 */
function heartbeat(now) {
  host?.dwell?.tick(now);
  host?.dwell?.hold(now);
  requestAnimationFrame(heartbeat);
}
requestAnimationFrame(heartbeat);

setInterval(() => { updateStats(); if (reader.state === 'playing') renderStack(); }, 300);

renderConsent();
rebuild();
</script>
</body>
</html>