ddevmem 0.4.0-alpha.5

Safe, ergonomic access to physical memory via /dev/mem with volatile MMIO semantics, declarative register maps, and an optional web UI.
Documentation 
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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>ddevmem — Register Map</title>
<script>
  // Apply saved theme as early as possible to avoid a flash.
  (function() {
    var t = localStorage.getItem('ddevmem-theme');
    if (!t) t = matchMedia('(prefers-color-scheme: light)').matches ? 'g10' : 'g100';
    document.documentElement.setAttribute('data-theme', t);
  })();
</script>
<style>
  /*
   * Carbon-inspired token system. Two themes:
   *   data-theme="g10"   → light (Gray 10 theme)
   *   data-theme="g100"  → dark  (Gray 100 theme)
   * The :root block holds the dark defaults so themes can be flipped via
   * the [data-theme] attribute on <html>.
   */
  :root, [data-theme="g100"] {
    --background: #161616;
    --layer-01: #262626;
    --layer-02: #393939;
    --layer-hover: #353535;
    --layer-active: #525252;
    --field-01: #262626;
    --field-02: #393939;
    --field-hover: #353535;
    --border-subtle: #393939;
    --border-strong: #6f6f6f;
    --text-primary: #f4f4f4;
    --text-secondary: #c6c6c6;
    --text-helper: #a8a8a8;
    --text-placeholder: #6f6f6f;
    --text-on-color: #ffffff;
    --link-primary: #78a9ff;
    --link-hover: #a6c8ff;
    --focus: #ffffff;
    /* Component tokens — same hue across themes for semantic consistency */
    --button-primary: #0f62fe;
    --button-primary-hover: #0353e9;
    --button-primary-active: #002d9c;
    --button-secondary: #6f6f6f;        /* lighter in dark theme for contrast on dark bg */
    --button-secondary-hover: #5e5e5e;
    --button-secondary-active: #393939;
    --button-tertiary: #ffffff;          /* on dark bg, tertiary uses white border/text */
    --button-tertiary-hover: #f4f4f4;
    --button-tertiary-active: #c6c6c6;
    --button-separator: #161616;         /* 1px line between buttons in a btn-set */
    /* Tag colours: dark theme uses step-20 text on step-70 background.
       rw → Blue, ro → Cool Gray, wo → Magenta. */
    --tag-bg-rw: #0043ce; --tag-fg-rw: #d0e2ff;
    --tag-bg-ro: #4d5358; --tag-fg-ro: #dde1e6;
    --tag-bg-wo: #9f1853; --tag-fg-wo: #ffd6e8;
    --support-success: #42be65;
  }

  [data-theme="g10"] {
    --background: #ffffff;
    --layer-01: #f4f4f4;
    --layer-02: #ffffff;
    --layer-hover: #e8e8e8;
    --layer-active: #c6c6c6;
    --field-01: #f4f4f4;
    --field-02: #ffffff;
    --field-hover: #e8e8e8;
    --border-subtle: #e0e0e0;
    --border-strong: #8d8d8d;
    --text-primary: #161616;
    --text-secondary: #525252;
    --text-helper: #6f6f6f;
    --text-placeholder: #a8a8a8;
    --text-on-color: #ffffff;
    --link-primary: #0f62fe;
    --link-hover: #0043ce;
    --focus: #0f62fe;
    --button-primary: #0f62fe;
    --button-primary-hover: #0353e9;
    --button-primary-active: #002d9c;
    --button-secondary: #393939;        /* Gray 80 per Carbon spec */
    --button-secondary-hover: #4c4c4c;
    --button-secondary-active: #6f6f6f;
    --button-tertiary: #0f62fe;          /* on light bg, tertiary uses Blue 60 */
    --button-tertiary-hover: #0353e9;
    --button-tertiary-active: #002d9c;
    --button-separator: #e0e0e0;         /* 1px line between buttons in a btn-set */
    /* Tag colours: light theme uses step-70 text on step-20 background. */
    --tag-bg-rw: #d0e2ff; --tag-fg-rw: #0043ce;
    --tag-bg-ro: #dde1e6; --tag-fg-ro: #4d5358;
    --tag-bg-wo: #ffd6e8; --tag-fg-wo: #9f1853;
    --support-success: #24a148;
  }

  /* Carbon spacing scale (subset). All paddings/margins below reference
     these tokens so the layout follows the official 8 px grid. */
  :root {
    --spacing-01: .125rem; /*  2 px */
    --spacing-02: .25rem;  /*  4 px */
    --spacing-03: .5rem;   /*  8 px */
    --spacing-04: .75rem;  /* 12 px */
    --spacing-05: 1rem;    /* 16 px */
    --spacing-06: 1.5rem;  /* 24 px */
    --spacing-07: 2rem;    /* 32 px */
    --spacing-08: 2.5rem;  /* 40 px */
    --spacing-09: 3rem;    /* 48 px */
    --header-h:  3rem;     /* UI-shell header */
    --sidenav-w: 16rem;    /* 256 px — Carbon side-nav width */
  }

  * { box-sizing: border-box; margin: 0; padding: 0; }
  html, body { background: var(--background); color: var(--text-primary); }
  body {
    font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 14px;
    line-height: 1.4;
    /* No body padding: the UI-Shell header is fixed on top, side-nav is
       fixed on the left, and `.main-content` carries its own gutters. */
    padding: 0;
    padding-top: var(--header-h);
    -webkit-font-smoothing: antialiased;
    transition: background-color 70ms, color 70ms;
  }
  code, kbd, .mono, input, select, .reg-offset, .hex, .bf-val {
    font-family: 'IBM Plex Mono', ui-monospace, 'JetBrains Mono', 'Fira Code', monospace;
  }

  h1 { font-size: 1.75rem; font-weight: 300; letter-spacing: -.01em; margin-bottom: var(--spacing-02); }
  h2 {
    font-size: 1.25rem; font-weight: 400; margin: var(--spacing-07) 0 var(--spacing-03);
    padding: var(--spacing-03) 0; border-bottom: 1px solid var(--border-subtle);
    display: flex; align-items: center; justify-content: space-between; gap: var(--spacing-05);
  }
  h2 .map-dump { font-size: .75rem; }
  .meta { color: var(--text-helper); font-size: .75rem; margin-bottom: var(--spacing-05); letter-spacing: .02em; }

  /* ---- UI-Shell header (Carbon `.cds--header`) -------------------------
     Fixed 48 px black/white bar across the top of the viewport. Holds
     the product name on the left and global actions (theme toggle) on
     the right. */
  .app-header {
    position: fixed; inset: 0 0 auto 0;
    height: var(--header-h);
    display: flex; align-items: center;
    background: var(--background);
    border-bottom: 1px solid var(--border-subtle);
    z-index: 10;
  }
  .app-header .brand {
    padding: 0 var(--spacing-05);
    font-size: .875rem;
    font-weight: 600;
    letter-spacing: .01em;
    color: var(--text-primary);
    display: inline-flex; align-items: center; gap: var(--spacing-03);
  }
  .app-header .brand .brand-sub {
    color: var(--text-helper);
    font-weight: 400;
  }
  .app-header .header-actions {
    margin-left: auto;
    display: inline-flex;
    height: 100%;
  }
  .app-header .header-actions > button {
    height: var(--header-h);
    width: var(--header-h);
    border-radius: 0;
    border-color: transparent;
    color: var(--text-primary);
  }
  .app-header .header-actions > button:hover {
    background: var(--layer-01);
    color: var(--text-primary);
    border-color: transparent;
  }
  .app-header .header-actions > button:focus {
    border-color: var(--focus);
    box-shadow: inset 0 0 0 1px var(--focus),
                inset 0 0 0 2px var(--background);
  }

  /* Tile (register card) */
  .reg-card {
    background: var(--layer-01);
    border: 1px solid transparent;
    padding: var(--spacing-05) var(--spacing-05);
    margin-bottom: 2px;
    transition: background-color 70ms, border-color 70ms;
  }
  .reg-header { display: flex; align-items: center; gap: var(--spacing-04); flex-wrap: wrap; margin-bottom: var(--spacing-02); }
  .reg-name { font-weight: 600; font-size: 1rem; color: var(--text-primary); }
  .reg-offset { color: var(--text-helper); font-size: .75rem; margin-left: auto; }
  .reg-doc { color: var(--text-secondary); font-size: .8125rem; margin: var(--spacing-02) 0 var(--spacing-04); }

  /*
   * Tag (Carbon spec, size sm = 18px, pill shape). rw/ro/wo carry no
   * "alarm" semantics, so we use Blue / Cool Gray / Magenta from the Carbon
   * tag palette (step-70 text on step-20 bg in light themes; inverted in
   * dark). Sentence case per Carbon content guidelines.
   */
  .badge {
    display: inline-flex;
    align-items: center;
    height: 18px;
    padding: 0 8px;
    border: 0;
    border-radius: 16px;
    font-size: .75rem;            /* 12px — $label-01 */
    line-height: 1.3334;
    font-weight: 400;
    letter-spacing: .32px;
    text-transform: uppercase;    /* short access labels read better caps */
  }
  .badge-rw { background: var(--tag-bg-rw); color: var(--tag-fg-rw); }
  .badge-ro { background: var(--tag-bg-ro); color: var(--tag-fg-ro); }
  .badge-wo { background: var(--tag-bg-wo); color: var(--tag-fg-wo); }

  /* Text input — Carbon style: square, bottom border, focus inset outline */
  input[type="text"], input:not([type]), select, .bf-input {
    background: var(--field-01);
    color: var(--text-primary);
    border: 0;
    border-bottom: 1px solid var(--border-strong);
    padding: 6px 10px;
    font-size: .8125rem;
    height: 2rem;
    outline: none;
    transition: background-color 70ms, border-color 70ms, outline-color 70ms;
    min-width: 0;
  }
  input::placeholder { color: var(--text-placeholder); }
  input:hover, select:hover, .bf-input:hover { background: var(--field-hover); }
  input:focus, select:focus, .bf-input:focus {
    outline: 2px solid var(--focus);
    outline-offset: -2px;
    border-bottom-color: transparent;
  }
  .reg-value input { width: 16ch; }
  .bf-input { height: 1.75rem; padding: 4px 8px; width: 9ch; }

  /* Set-cell layout: input/select stretches, the Set button always lands at
     the right edge of the column so buttons line up across rows. */
  .bf-set { display: flex; gap: .5rem; align-items: center; }
  .bf-set .bf-input { flex: 1 1 auto; width: auto; min-width: 0; }
  .bf-set > button { flex: 0 0 auto; }

  select, select.bf-input {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-repeat: no-repeat;
    background-position: right .75rem center;
    cursor: pointer;
    text-overflow: ellipsis;
    padding-right: 2rem;          /* 12 px chevron-edge + 16 px chevron + 4 px gap */
  }
  select::-ms-expand { display: none; }
  select.bf-input {
    width: auto;
    min-width: 11ch;
    height: 1.75rem;
    padding: 4px 2rem 4px 8px;
    background-position: right .5rem center;
  }

  .reg-value { display: flex; align-items: center; gap: .5rem; margin: .5rem 0; flex-wrap: wrap; }
  /* Carbon `.cds--btn-set` — adjacent buttons sit flush against each other,
     separated only by a 1px box-shadow line ($button-separator). The group
     gets its own `.btn-set` wrapper to override the .reg-value flex gap. */
  .btn-set { display: inline-flex; }
  .btn-set > button:not(:first-of-type):not(:focus) {
    box-shadow: -1px 0 0 0 var(--button-separator);
  }
  .btn-set > button:focus + button:not(:focus) { box-shadow: none; }
  .reg-value .hex { color: var(--text-secondary); font-size: .8125rem; min-width: 12ch; }

  /*
   * Buttons — match @carbon/styles/scss/components/button/_button.scss
   *
   *  default        → Primary    (Write, Set)
   *  .btn-secondary → Secondary  (Read)
   *  .btn-tertiary  → Tertiary   (Refresh All, Dump All, theme toggle)
   *
   * Carbon spec (size sm = 32 px):
   *   - inline-flex, justify-content: space-between, text-align: start
   *     → label is left-aligned, icon (if any) sits on the right
   *   - asymmetric padding-inline: 11px on the start side, 51px on the end
   *     side (= padding-inline * 3 + 16px − 1px); reserves icon space and
   *     gives the signature wide-button look even for label-only buttons.
   *   - body-compact-01: 14 px / 18 px line-height, weight 400, letter-spacing .16px
   *   - border: 1px solid (matches bg for primary/secondary, transparent for ghost)
   *   - focus: double inset box-shadow (focus colour + background), no outline
   */
  button {
    display: inline-flex;
    align-items: center;
    justify-content: space-between;
    text-align: start;
    background: var(--button-primary);
    color: var(--text-on-color);
    border: 1px solid var(--button-primary);
    /* size sm: padding-inline 11px / 51px, height 32px */
    padding: 0 3.1875rem 0 .6875rem;
    min-height: 2rem;
    min-width: max-content;
    max-width: 20rem;
    font-family: inherit;
    font-size: .875rem;          /* 14px — body-compact-01 */
    line-height: 1.28572;         /* 18 / 14 */
    font-weight: 400;
    letter-spacing: .16px;
    cursor: pointer;
    vertical-align: top;
    transition: background-color 70ms cubic-bezier(.2,0,.38,.9),
                box-shadow 70ms cubic-bezier(.2,0,.38,.9),
                border-color 70ms cubic-bezier(.2,0,.38,.9),
                color 70ms cubic-bezier(.2,0,.38,.9);
  }
  button:hover  { background: var(--button-primary-hover); border-color: var(--button-primary-hover); }
  button:active { background: var(--button-primary-active); border-color: var(--button-primary-active); }
  /*
   * Focus ring — verbatim from @carbon/styles button-theme mixin
   * (packages/styles/scss/components/button/_mixins.scss):
   *
   *   border-color: $button-focus-color;
   *   box-shadow:
   *     inset 0 0 0 $button-outline-width $button-focus-color,
   *     inset 0 0 0 $button-border-width  $background;
   *
   * with $button-outline-width: 1px and $button-border-width: 2px
   * (packages/styles/scss/components/button/_vars.scss).
   *
   * The first listed shadow paints on top of the second, so the
   * visible result is:
   *   0..1 px from edge — focus colour (outer line)
   *   1..2 px           — background colour (inner line, visible
   *                        only where the first shadow doesn't reach)
   * That's the characteristic two-line indicator: an outer focus
   * stripe + an inner gap of the page background.
   *
   * The selector list raises specificity to (0,2,1) so the focus
   * indicator wins over `.btn-secondary:hover`, `.btn-ghost:active`
   * etc. — otherwise hover/active rules would reset border-color
   * and erase the outer line while the user is pressing the button.
   */
  button:focus,
  button.btn-secondary:focus,
  button.btn-tertiary:focus,
  button.btn-ghost:focus,
  button.btn-icon-only:focus {
    outline: none;
    border-color: var(--focus);
    box-shadow: inset 0 0 0 1px var(--focus),
                inset 0 0 0 2px var(--background);
  }

  button.btn-secondary {
    background: var(--button-secondary);
    color: var(--text-on-color);
    border-color: var(--button-secondary);
  }
  button.btn-secondary:hover  { background: var(--button-secondary-hover); border-color: var(--button-secondary-hover); }
  button.btn-secondary:active { background: var(--button-secondary-active); border-color: var(--button-secondary-active); }

  button.btn-tertiary {
    background: transparent;
    color: var(--button-tertiary);
    border-color: var(--button-tertiary);
  }
  button.btn-tertiary:hover {
    background: var(--button-tertiary-hover);
    color: var(--background);
    border-color: var(--button-tertiary-hover);
  }
  button.btn-tertiary:active {
    background: var(--button-tertiary-active);
    color: var(--background);
    border-color: var(--button-tertiary-active);
  }

  /*
   * Ghost button. Carbon recommends ghost over tertiary for toolbar / page-
   * level supplementary actions when the page already has primary buttons
   * (see https://carbondesignsystem.com/components/button/usage,
   * “Ghost buttons for data table actions”).
   *   - transparent bg + border
   *   - label colour: $link-primary (Blue 60)
   *   - hover bg: $background-hover; active bg: $background-active
   *   - same 32 px height as other sm buttons but symmetric padding
   */
  button.btn-ghost {
    background: transparent;
    color: var(--link-primary);
    border-color: transparent;
    /* ghost: 15px on the start side, 15px on the end side (density 16 - 1) */
    padding: 0 .9375rem;
  }
  button.btn-ghost:hover  { background: var(--layer-hover);  color: var(--link-hover); border-color: transparent; }
  button.btn-ghost:active { background: var(--layer-active); color: var(--link-hover); border-color: transparent; }
  /* Ghost focus is handled by the shared `button:focus` selector list
     above so its specificity beats `.btn-ghost:hover/:active`. */

  /* Icon-only ghost button (Carbon `.cds--btn--icon-only`): square 2 rem,
     symmetric padding, centred 16 px glyph. */
  button.btn-icon-only {
    width: 2rem; height: 2rem;
    padding: 0;
    justify-content: center;
  }
  button.btn-icon-only svg { width: 16px; height: 16px; fill: currentColor; }

  /* Bitfield data table */
  .bitfields { margin-top: .75rem; }
  .bf-table { width: 100%; border-collapse: collapse; font-size: .8125rem; background: var(--layer-01); }
  .bf-table th, .bf-table td { padding: .5rem .75rem; text-align: left; vertical-align: middle; border: 0; }
  .bf-table thead th {
    background: var(--layer-02); color: var(--text-secondary);
    font-weight: 600; font-size: .75rem; letter-spacing: .02em;
    border-bottom: 1px solid var(--border-subtle);
  }
  .bf-table tbody tr { border-bottom: 1px solid var(--border-subtle); }
  .bf-table tbody tr:last-child { border-bottom: 0; }
  .bf-table tbody tr:hover { background: var(--layer-hover); }
  .bf-val { color: var(--text-primary); font-weight: 400; }
  .bf-doc { color: var(--text-helper); }

  /* Status / messages */
  .error { color: #da1e28; font-size: .75rem; }
  .status { font-size: .75rem; color: var(--text-helper); margin-left: .5rem; }

  /* Toolbar */
  .toolbar {
    display: flex; align-items: center; gap: var(--spacing-03);
    margin: var(--spacing-05) 0 var(--spacing-06);
    flex-wrap: wrap;
  }
  .toolbar .spacer { flex: 1; }
  .toolbar label { font-size: .8125rem; color: var(--text-secondary); cursor: pointer; user-select: none; display: inline-flex; align-items: center; gap: var(--spacing-03); }

  /* Checkbox */
  input[type="checkbox"] {
    appearance: none; -webkit-appearance: none;
    width: 1rem; height: 1rem;
    background: transparent;
    border: 1px solid var(--text-secondary);
    margin: 0; padding: 0;
    position: relative; cursor: pointer;
    transition: background-color 70ms, border-color 70ms;
  }
  input[type="checkbox"]:hover { border-color: var(--text-primary); }
  input[type="checkbox"]:checked { background: var(--text-primary); border-color: var(--text-primary); }
  input[type="checkbox"]:checked::after {
    content: ''; position: absolute;
    left: 3px; top: 0px;
    width: 5px; height: 9px;
    border: solid var(--background);
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
  }
  input[type="checkbox"]:focus { outline: 2px solid var(--focus); outline-offset: 1px; }

  /* Layout + side-nav (Carbon `.cds--side-nav`).
     The side-nav is fixed to the left edge under the UI-Shell header and
     spans the full remaining viewport height. Main content is offset by
     the sidebar width when the sidebar is visible. */
  .layout { display: block; }
  .sidebar {
    position: fixed;
    top: var(--header-h);
    left: 0;
    width: var(--sidenav-w);
    height: calc(100vh - var(--header-h));
    overflow-y: auto;
    background: var(--layer-01);
    border-right: 1px solid var(--border-subtle);
    padding: var(--spacing-03) 0;
    display: none;
    z-index: 5;
  }
  .sidebar.visible { display: block; }
  .sidebar a {
    display: flex; align-items: baseline; gap: var(--spacing-03);
    /* Carbon side-nav item: 32 px height, 16 px inline padding */
    padding: var(--spacing-02) var(--spacing-05);
    min-height: 2rem;
    color: var(--text-secondary); text-decoration: none;
    font-size: .8125rem;
    white-space: nowrap; overflow: hidden;
    border-left: 3px solid transparent;
    transition: background-color 70ms, color 70ms, border-color 70ms;
  }
  .sidebar a .nav-name { overflow: hidden; text-overflow: ellipsis; }
  .sidebar a .nav-addr {
    margin-left: auto;
    font-family: 'IBM Plex Mono', ui-monospace, monospace;
    font-size: .6875rem; color: var(--text-helper);
    flex-shrink: 0;
  }
  .sidebar a:hover .nav-addr,
  .sidebar a.active .nav-addr { color: var(--text-secondary); }
  .sidebar a:hover { background: var(--layer-hover); color: var(--text-primary); }
  /* Carbon side-nav focus: 2 px inset stroke matching the focus token. */
  .sidebar a:focus {
    outline: 2px solid var(--focus);
    outline-offset: -2px;
  }
  .sidebar a.active {
    background: var(--layer-02); color: var(--text-primary);
    border-left-color: var(--button-primary);
    font-weight: 600;
  }
  .sidebar .nav-heading {
    color: var(--text-helper);
    font-weight: 600; font-size: .6875rem; letter-spacing: .04em; text-transform: uppercase;
    padding: var(--spacing-04) var(--spacing-05) var(--spacing-01);
  }
  .sidebar .nav-base {
    font-family: 'IBM Plex Mono', ui-monospace, monospace;
    font-size: .6875rem; color: var(--text-helper);
    padding: 0 var(--spacing-05) var(--spacing-02);
    text-transform: none; letter-spacing: 0; font-weight: 400;
  }
  .sidebar::-webkit-scrollbar { width: 8px; }
  .sidebar::-webkit-scrollbar-thumb { background: var(--border-subtle); }
  .sidebar::-webkit-scrollbar-track { background: transparent; }

  .main-content {
    /* Carbon page gutters: 32 px on wide displays, 16 px below 672 px. */
    padding: var(--spacing-06) var(--spacing-07);
    min-width: 0;
    transition: margin-left 70ms;
  }
  /* When the side-nav is visible, push content to the right of it. */
  body:has(.sidebar.visible) .main-content { margin-left: var(--sidenav-w); }
  @media (max-width: 720px) {
    .main-content { padding: var(--spacing-05); }
    body:has(.sidebar.visible) .main-content { margin-left: 0; }
    .sidebar.visible { display: none; }
  }

  a { color: var(--link-primary); }
  a:hover { color: var(--link-hover); }

  /* Drop-down options. Native <option> only allows colour + bg. */
  option {
    background: var(--layer-hover);
    color: var(--text-primary);
  }

  ::selection { background: var(--button-primary); color: var(--text-on-color); }
</style>
</head>
<body>

<header class="app-header" role="banner">
  <span class="brand" id="brand">
    ddevmem
    <span class="brand-sub">· Register Map</span>
  </span>
  <div class="header-actions">
    <button class="btn-ghost btn-icon-only" id="theme-toggle" onclick="toggleTheme()" aria-label="Toggle theme" title="Toggle theme"></button>
  </div>
</header>

<div class="layout">
<nav class="sidebar" id="sidebar"></nav>
<div class="main-content">

<h1 id="title">ddevmem — Register Map</h1>
<div class="meta" id="meta"></div>

<div class="toolbar">
  <button class="btn-ghost" onclick="refreshAll()">Refresh all</button>
  <button class="btn-ghost" onclick="dumpAll()">Dump all</button>
  <label><input type="checkbox" id="auto-refresh"> Auto-refresh (1s)</label>
  <span class="status" id="global-status"></span>
</div>

<div id="maps"></div>
</div>
</div>

<script>
const API_BASE = window.location.pathname.replace(/\/?$/, '/') + 'api';
let allMaps = []; // { slug, name, info, apiPrefix }
let autoTimer = null;

const $  = id => document.getElementById(id);
const ce = tag => document.createElement(tag);

async function api(path, body) {
  const opts = body !== undefined
    ? { method: 'POST', headers: {'Content-Type':'application/json'}, body: JSON.stringify(body) }
    : {};
  const r = await fetch(API_BASE + path, opts);
  if (!r.ok) throw new Error(r.status + ' ' + r.statusText);
  if (r.headers.get('content-type')?.includes('json')) return r.json();
}

function hexStr(val, bits) {
  const digits = Math.ceil(bits / 4);
  return '0x' + BigInt(val).toString(16).toUpperCase().padStart(digits, '0');
}

function extractBits(val, lo, hi) {
  const v = BigInt(val);
  const width = BigInt(hi - lo + 1);
  const mask = (1n << width) - 1n;
  return Number((v >> BigInt(lo)) & mask);
}

function setBits(oldVal, lo, hi, newFieldVal) {
  let v = BigInt(oldVal);
  const width = BigInt(hi - lo + 1);
  const mask = (1n << width) - 1n;
  v = (v & ~(mask << BigInt(lo))) | ((BigInt(newFieldVal) & mask) << BigInt(lo));
  return Number(v & ((1n << 64n) - 1n));
}

function escHtml(s) {
  const d = document.createElement('div');
  d.textContent = s;
  return d.innerHTML;
}

// Replace the UI-Shell brand with a user-supplied title. The original
// "ddevmem · Register Map" markup is split into two spans so the
// theming CSS can dim the suffix; once a custom title is set we drop
// that decoration and show the user's string verbatim.
function setBrand(title) {
  const el = $('brand');
  if (!el) return;
  el.textContent = title;
}

async function init() {
  try {
    // Try multi-map mode first (/api/maps), fall back to single-map (/api/info)
    let multiMode = false;
    let customTitle = null;
    try {
      const resp = await api('/maps');
      // The endpoint returns either the legacy bare array `[{slug,name},…]`
      // or the new wrapper `{ title, maps: […] }`. Accept both.
      const maps = Array.isArray(resp) ? resp : resp.maps;
      if (!Array.isArray(resp) && typeof resp.title === 'string') {
        customTitle = resp.title;
      }
      const infos = await Promise.all(maps.map(m => api('/' + m.slug + '/info')));
      allMaps = maps.map((m, i) => ({
        slug: m.slug, name: m.name, info: infos[i],
        apiPrefix: '/' + m.slug
      }));
      multiMode = true;
    } catch (_) {
      const info = await api('/info');
      allMaps = [{ slug: '_', name: info.name, info: info, apiPrefix: '' }];
    }

    if (multiMode) {
      const heading = customTitle || 'ddevmem — Register Maps';
      $('title').textContent = heading;
      document.title = heading;
      if (customTitle) setBrand(customTitle);
      $('meta').textContent = allMaps.length + ' register map(s)';
    } else {
      const info = allMaps[0].info;
      $('title').textContent = info.name + ' — Register Map';
      document.title = info.name + ' — Register Map';
      $('meta').textContent = 'Base: ' + hexStr(info.base_address, 32)
        + '  |  Bus width: ' + (info.bus_width * 8) + ' bit'
        + '  |  ' + info.registers.length + ' register(s)';
    }

    renderAll(multiMode);
    refreshAll();
  } catch (e) {
    $('maps').innerHTML = '<div class="error">Failed to load: ' + escHtml(e.message) + '</div>';
  }
}

/*
 * Firefox and Safari do not move keyboard focus to <button> on click \u2014
 * `:focus` only fires on Tab navigation. Carbon explicitly relies on
 * pointerdown-driven focus to keep the focus indicator visible while
 * the user is pressing the button. We delegate from the document so
 * dynamically rendered buttons (re-created by renderAll) are covered.
 */
document.addEventListener('pointerdown', (e) => {
  const btn = e.target.closest('button');
  if (btn && !btn.disabled) btn.focus();
});

function renderAll(showHeaders) {
  const container = $('maps');
  container.innerHTML = '';
  for (const map of allMaps) {
    const info = map.info;
    const section = ce('div');
    section.id = 'map-' + map.slug;

    let html = '';
    if (showHeaders) {
      html += '<h2>' + escHtml(info.name)
            + '<button class="btn-ghost map-dump" onclick="dumpMap(\'' + map.slug + '\')">Dump</button>'
            + '</h2>';
      html += '<div class="meta">' + escHtml(map.slug) + ' · Base: ' + hexStr(info.base_address, 32)
            + ' · Bus: ' + (info.bus_width * 8) + '-bit · ' + info.registers.length + ' register(s)</div>';
    }

    for (const reg of info.registers) {
      const uid = map.slug + '-' + reg.offset;
      html += '<div class="reg-card" id="reg-' + uid + '">';
      html += '<div class="reg-header">'
            + '<span class="reg-name">' + escHtml(reg.name) + '</span>'
            + '<span class="badge badge-' + reg.access + '">' + reg.access + '</span>'
            + '<span class="reg-offset">' + hexStr(reg.offset, 16) + ' (' + reg.width + '-bit)</span>'
            + '</div>';
      if (reg.doc) html += '<div class="reg-doc">' + escHtml(reg.doc) + '</div>';

      html += '<div class="reg-value">';
      if (reg.access !== 'wo') {
        html += '<span>Value:</span><span class="hex" id="val-' + uid + '">—</span>';
      }
      if (reg.access !== 'ro') {
        html += '<input id="inp-' + uid + '" placeholder="hex value">';
      }
      // Write + Read form a Carbon btn-set (flush, 1px separator).
      const hasWrite = reg.access !== 'ro';
      const hasRead  = reg.access !== 'wo';
      if (hasWrite || hasRead) {
        html += '<div class="btn-set">';
        if (hasWrite) {
          html += '<button onclick="writeReg(\'' + map.slug + '\',' + reg.offset + ',' + reg.width + ')">Write</button>';
        }
        if (hasRead) {
          html += '<button class="btn-secondary" onclick="readReg(\'' + map.slug + '\',' + reg.offset + ',' + reg.width + ')">Read</button>';
        }
        html += '</div>';
      }
      html += '<span class="status" id="st-' + uid + '"></span></div>';

      if (reg.bitfields.length > 0) {
        html += '<div class="bitfields"><table class="bf-table"><thead><tr>'
              + '<th>Field</th><th>Bits</th><th>Value</th>';
        if (reg.access !== 'ro') html += '<th>Set</th>';
        html += '<th>Doc</th></tr></thead><tbody>';
        for (const bf of reg.bitfields) {
          const bits = bf.lo === bf.hi ? '' + bf.lo : bf.hi + ':' + bf.lo;
          const bfid = uid + '-' + bf.name;
          html += '<tr><td>' + escHtml(bf.name) + '</td><td>' + bits + '</td>'
                + '<td class="bf-val" id="bf-' + bfid + '">—</td>';
          if (reg.access !== 'ro') {
            html += '<td><div class="bf-set">';
            if (bf.variants && bf.variants.length > 0) {
              html += '<select class="bf-input" id="bfi-' + bfid + '">';
              for (const v of bf.variants) {
                html += '<option value="' + v.value + '">' + escHtml(v.name) + ' (' + v.value + ')</option>';
              }
              html += '</select>';
            } else {
              html += '<input class="bf-input" id="bfi-' + bfid + '" placeholder="val">';
            }
            html += '<button onclick="writeBitfield(\'' + map.slug + '\',' + reg.offset + ',' + bf.lo + ',' + bf.hi + ',\'' + bf.name + '\',' + reg.width + ')">Set</button></div></td>';
          }
          html += '<td class="bf-doc">' + escHtml(bf.doc) + '</td></tr>';
        }
        html += '</tbody></table></div>';
      }
      html += '</div>';
    }
    section.innerHTML = html;
    container.appendChild(section);
  }

  // Build sidebar navigation
  const sidebar = $('sidebar');
  let navHtml = '';
  for (const map of allMaps) {
    const info = map.info;
    if (allMaps.length > 1 || map.slug !== '_') {
      navHtml += '<div class="nav-heading">' + escHtml(info.name) + '</div>';
    }
    navHtml += '<div class="nav-base" title="Base address">Base ' + hexStr(info.base_address, 32) + '</div>';
    for (const reg of info.registers) {
      const uid = map.slug + '-' + reg.offset;
      navHtml += '<a href="#reg-' + uid + '" title="' + escHtml(reg.name) + ' ' + hexStr(reg.offset, 16) + '">'
               + '<span class="nav-name">' + escHtml(reg.name) + '</span>'
               + '<span class="nav-addr">' + hexStr(reg.offset, 16) + '</span>'
               + '</a>';
    }
  }
  sidebar.innerHTML = navHtml;
  if (allMaps.reduce((s, m) => s + m.info.registers.length, 0) > 1) {
    sidebar.classList.add('visible');
  }
  setupScrollSpy();
}

/*
 * Scroll spy: highlight the sidebar link that corresponds to the register
 * currently in view, and reflect its anchor in the URL hash. Uses
 * IntersectionObserver against the .reg-card elements.
 */
let scrollSpyObserver = null;
let visibleCards = new Set();
function setupScrollSpy() {
  if (scrollSpyObserver) scrollSpyObserver.disconnect();
  visibleCards = new Set();
  const cards = document.querySelectorAll('.reg-card');
  if (!cards.length) return;
  // rootMargin: trigger when card enters the top portion of the viewport.
  scrollSpyObserver = new IntersectionObserver((entries) => {
    for (const e of entries) {
      if (e.isIntersecting) visibleCards.add(e.target.id);
      else visibleCards.delete(e.target.id);
    }
    // When the page is scrolled to the very bottom the last card cannot
    // reach the top of the viewport — in that case force-pick the last
    // visible card so the sidebar indicator still tracks the user.
    const atBottom = window.innerHeight + window.scrollY >=
                     document.documentElement.scrollHeight - 2;
    if (atBottom && visibleCards.size > 0) {
      let bottomId = null, bottomY = -Infinity;
      for (const id of visibleCards) {
        const el = document.getElementById(id);
        if (!el) continue;
        const y = el.getBoundingClientRect().top;
        if (y > bottomY) { bottomY = y; bottomId = id; }
      }
      if (bottomId) { setActiveLink(bottomId); return; }
    }
    // Otherwise: pick the topmost visible card (smallest top offset).
    let topId = null, topY = Infinity;
    for (const id of visibleCards) {
      const el = document.getElementById(id);
      if (!el) continue;
      const y = el.getBoundingClientRect().top;
      if (y < topY) { topY = y; topId = id; }
    }
    if (topId) setActiveLink(topId);
  }, {
    rootMargin: '-10% 0px -70% 0px',
    threshold: 0,
  });
  cards.forEach(c => scrollSpyObserver.observe(c));

  // Direct click on a sidebar link: highlight immediately, regardless of
  // whether the target card can actually reach the IntersectionObserver's
  // trigger band (last register cannot, since there's nothing below it).
  document.querySelectorAll('.sidebar a').forEach(a => {
    a.addEventListener('click', () => {
      const href = a.getAttribute('href') || '';
      if (href.startsWith('#')) setActiveLink(href.slice(1));
    });
  });
}

function setActiveLink(cardId) {
  const links = document.querySelectorAll('.sidebar a');
  let activeLink = null;
  links.forEach(a => {
    const isActive = a.getAttribute('href') === '#' + cardId;
    a.classList.toggle('active', isActive);
    if (isActive) activeLink = a;
  });
  if (activeLink) {
    // Scroll the sidebar so the active link stays visible.
    const sb = $('sidebar');
    if (sb) {
      const lr = activeLink.getBoundingClientRect();
      const sr = sb.getBoundingClientRect();
      if (lr.top < sr.top || lr.bottom > sr.bottom) {
        activeLink.scrollIntoView({ block: 'nearest' });
      }
    }
    // Update the URL hash without triggering a jump.
    if (location.hash !== '#' + cardId) {
      history.replaceState(null, '', '#' + cardId);
    }
  }
}

function getMap(slug) {
  return allMaps.find(m => m.slug === slug);
}

async function readReg(slug, offset, width) {
  const map = getMap(slug);
  if (!map) return;
  const uid = slug + '-' + offset;
  const st = $('st-' + uid);
  try {
    const resp = await api(map.apiPrefix + '/read', { offset });
    const el = $('val-' + uid);
    if (el) el.textContent = hexStr(resp.value, width);
    updateBitfields(slug, offset, resp.value);
    if (st) st.textContent = '';
  } catch (e) {
    if (st) st.textContent = e.message;
  }
}

function updateBitfields(slug, offset, value) {
  const map = getMap(slug);
  if (!map) return;
  const reg = map.info.registers.find(r => r.offset === offset);
  if (!reg) return;
  for (const bf of reg.bitfields) {
    const el = $('bf-' + slug + '-' + offset + '-' + bf.name);
    if (!el) continue;
    const rawVal = extractBits(value, bf.lo, bf.hi);
    if (bf.variants && bf.variants.length > 0) {
      const v = bf.variants.find(v => v.value === rawVal);
      el.textContent = v ? v.name + ' (' + rawVal + ')' : String(rawVal);
      const sel = $('bfi-' + slug + '-' + offset + '-' + bf.name);
      if (sel && sel.tagName === 'SELECT') sel.value = String(rawVal);
    } else {
      el.textContent = rawVal;
    }
  }
}

async function writeReg(slug, offset, width) {
  const map = getMap(slug);
  if (!map) return;
  const uid = slug + '-' + offset;
  const inp = $('inp-' + uid);
  const st = $('st-' + uid);
  if (!inp) return;
  try {
    const value = Number(inp.value.trim());
    if (isNaN(value)) throw new Error('invalid number');
    await api(map.apiPrefix + '/write', { offset, value });
    if (st) st.textContent = 'written';
    await readReg(slug, offset, width);
  } catch (e) {
    if (st) st.textContent = e.message;
  }
}

async function writeBitfield(slug, offset, lo, hi, name, width) {
  const map = getMap(slug);
  if (!map) return;
  const uid = slug + '-' + offset;
  const inp = $('bfi-' + uid + '-' + name);
  const st = $('st-' + uid);
  if (!inp) return;
  try {
    const fieldVal = Number(inp.value.trim());
    if (isNaN(fieldVal)) throw new Error('invalid number');
    const resp = await api(map.apiPrefix + '/read', { offset });
    const newVal = setBits(resp.value, lo, hi, fieldVal);
    await api(map.apiPrefix + '/write', { offset, value: newVal });
    if (st) st.textContent = name + ' updated';
    await readReg(slug, offset, width);
  } catch (e) {
    if (st) st.textContent = e.message;
  }
}

async function refreshAll() {
  for (const map of allMaps) {
    for (const reg of map.info.registers) {
      if (reg.access !== 'wo') readReg(map.slug, reg.offset, reg.width);
    }
  }
}

async function dumpAll() { return dumpMaps(allMaps, 'global-status'); }
async function dumpMap(slug) {
  const map = getMap(slug);
  if (!map) return;
  return dumpMaps([map], 'global-status');
}

async function dumpMaps(maps, statusId) {
  if (!maps.length) return;
  const gs = statusId ? $(statusId) : null;
  if (gs) gs.textContent = 'Dumping...';
  try {
    const ts = new Date().toISOString().replace(/[:.]/g, '-');
    const multi = maps.length > 1 || maps[0].slug !== '_';
    let lines = [];
    lines.push('# ddevmem register dump');
    lines.push('# Date: ' + new Date().toISOString());
    if (multi) lines.push('# Maps: ' + maps.length);
    lines.push('');
    // For a single map the file is named after the map itself; for a
    // multi-map dump (e.g. "Dump all") we use a generic prefix instead of
    // accidentally taking the first map's name.
    let fileName = multi ? 'ddevmem-all' : null;
    for (const map of maps) {
      const info = map.info;
      if (multi) {
        lines.push('## ' + info.name + ' (' + map.slug + ')');
      } else {
        lines[0] = '# ' + info.name + ' register dump';
      }
      if (!fileName) {
        // Single-map dump: include the base address so dumps from
        // different instances of the same peripheral don't collide.
        fileName = info.name + '@' + hexStr(info.base_address, 32);
      }
      lines.push('# Base address: ' + hexStr(info.base_address, 32));
      lines.push('# Bus width: ' + (info.bus_width * 8) + ' bit');
      lines.push('');
      for (const reg of info.registers) {
        if (reg.access === 'wo') {
          lines.push(hexStr(reg.offset, 16) + '  ' + reg.name.padEnd(20) + '  [write-only]');
          continue;
        }
        try {
          const resp = await api(map.apiPrefix + '/read', { offset: reg.offset });
          const val = resp.value;
          lines.push(hexStr(reg.offset, 16) + '  ' + reg.name.padEnd(20) + '  ' + hexStr(val, reg.width) + '  (' + reg.access + ')');
          for (const bf of reg.bitfields) {
            const raw = extractBits(val, bf.lo, bf.hi);
            const bits = bf.lo === bf.hi ? 'bit ' + bf.lo : 'bits ' + bf.hi + ':' + bf.lo;
            let valStr = String(raw);
            if (bf.variants && bf.variants.length > 0) {
              const v = bf.variants.find(v => v.value === raw);
              if (v) valStr = v.name + ' (' + raw + ')';
            }
            lines.push('    ' + bf.name.padEnd(20) + '  [' + bits + ']  = ' + valStr);
          }
        } catch (e) {
          lines.push(hexStr(reg.offset, 16) + '  ' + reg.name.padEnd(20) + '  [read error: ' + e.message + ']');
        }
      }
      lines.push('');
    }
    const blob = new Blob([lines.join('\n') + '\n'], { type: 'text/plain' });
    const a = document.createElement('a');
    a.href = URL.createObjectURL(blob);
    a.download = (fileName || 'regdump') + '_' + ts + '.txt';
    a.click();
    URL.revokeObjectURL(a.href);
    if (gs) gs.textContent = 'Dump saved';
  } catch (e) {
    if (gs) gs.textContent = 'Dump failed: ' + e.message;
  }
}

$('auto-refresh').addEventListener('change', function() {
  if (this.checked) {
    autoTimer = setInterval(refreshAll, 1000);
  } else {
    clearInterval(autoTimer);
    autoTimer = null;
  }
});

function updateThemeButton() {
  const t = document.documentElement.getAttribute('data-theme');
  const btn = $('theme-toggle');
  if (!btn) return;
  // Carbon icons (16×16): "asleep" (moon) shown when in dark theme,
  // "light" (sun) shown when in light theme. The icon mirrors the *current*
  // theme, the title hints at the action ("Switch to …").
  const dark = t !== 'g10';
  const moon = '<svg viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg" aria-hidden="true">'
             + '<path d="M13.502 5.414a15.075 15.075 0 0 0 11.594 18.194 11.113 11.113 0 0 1-7.975 3.39c-.138 0-.278.005-.418 0a11.094 11.094 0 0 1-3.2-21.584M14.98 3a1 1 0 0 0-.175.016 13.096 13.096 0 0 0 1.825 25.981c.164.006.328 0 .49 0a13.072 13.072 0 0 0 10.703-5.555 1.01 1.01 0 0 0-.783-1.582 13.08 13.08 0 0 1-11.107-19.302A1.005 1.005 0 0 0 14.98 3z"/></svg>';
  const sun  = '<svg viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg" aria-hidden="true">'
             + '<path d="M16 12.005a4 4 0 1 1-4 4 4.005 4.005 0 0 1 4-4m0-2a6 6 0 1 0 6 6 6 6 0 0 0-6-6zM5.394 6.813 6.81 5.399 9.64 8.227 8.226 9.643zM2 15.005h4v2H2zM5.394 25.196 8.222 22.367 9.636 23.781 6.808 26.61zM15 26.005h2v4h-2zM22.362 23.79l1.414-1.414 2.828 2.827-1.414 1.415zM26 15.005h4v2h-4zM22.359 8.227 25.187 5.399 26.601 6.813 23.773 9.641zM15 2.005h2v4h-2z"/></svg>';
  btn.innerHTML = dark ? moon : sun;
  btn.title = dark ? 'Switch to light theme' : 'Switch to dark theme';
  btn.setAttribute('aria-label', btn.title);
}
function toggleTheme() {
  const cur = document.documentElement.getAttribute('data-theme');
  const next = cur === 'g10' ? 'g100' : 'g10';
  document.documentElement.setAttribute('data-theme', next);
  try { localStorage.setItem('ddevmem-theme', next); } catch (_) {}
  updateThemeButton();
}
updateThemeButton();

init();
</script>
</body>
</html>