pridaná generovaná navigácia z H1–H3 s unikátnymi ID,

pridaný responzívny panel a ukladanie stavu podľa URL,
pridané verzovanie CSS a JS pomocou MD5 hashov,
aktualizovaná dokumentácia

AGENTS.md

@@ -3,25 +3,35 @@
 ## Purpose
 This project is a small Markdown-to-HTML utility used behind NGINX.
 When a `.md` file is requested, `src/md2html.php` loads the Markdown, converts it with Parsedown, and renders HTML styled by `src/markdown.css`.
+`src/toc.js` builds an interactive table of contents from the rendered headings.
 
 ## Key Files
 - `src/md2html.php`: entrypoint for conversion and HTML output.
 - `src/markdown.css`: visual styling for rendered Markdown (`.markdown-body`).
+- `src/toc.js`: vanilla JavaScript for the table of contents and per-document panel state.
 - `composer.json`: PHP dependency config (`erusev/parsedown`).
+- `tests/fixtures/toc.md`: Markdown regression fixture.
+- `tests/render.php`: checks PHP output and exports heading data for JS tests.
+- `tests/toc.test.cjs`: Node.js tests using DOM doubles, without a browser.
+- `tests/run.ps1`: PowerShell runner for PHP and JS integration checks.
 
 ## Environment Assumptions
 - Project root: `D:\www\md2html`
 - Markdown files are resolved from `D:\www\...`
-- CSS is currently linked as `//localhost/md2html/src/markdown.css`
+- CSS and JS are linked under `//localhost/md2html/src/` with `?h=<MD5 of file contents>`.
+- NGINX forwards Markdown requests to `$document_root/md2html/src/md2html.php`; see README.md.
 
 ## Change Priorities
 1. Keep output readable on desktop and mobile.
 2. Preserve Markdown semantics generated by Parsedown.
-3. Avoid introducing JS unless explicitly required.
+3. Keep JavaScript in `src/toc.js`, use vanilla JavaScript, and avoid unnecessary dependencies.
 4. Keep the utility simple and fast.
 
 ## Styling Rules (`src/markdown.css`)
 - Style only inside `.markdown-body` unless there is a strong reason to change global page behavior.
+- Navigation is outside `.markdown-body`; scope its styles to `.md2html-toc*` and `.md2html-document` where possible.
+- At widths above 760px, the open panel must leave space for the document; at smaller widths, use a dismissible overlay.
+- Keep the toggle fixed and available, the panel independently scrollable, and reduced-motion preferences respected.
 - Must cover: headings, links, lists, blockquotes, inline code, code blocks, tables, images, hr.
 - Keep strong contrast and accessible font sizes.
 - Ensure long code lines and wide tables remain usable on small screens (`overflow-x`).
@@ -29,20 +39,32 @@ When a `.md` file is requested, `src/md2html.php` loads the Markdown, converts i
 
 ## PHP Rules (`src/md2html.php`)
 - Keep dependency loading via the project root's `vendor/autoload.php`, resolved relative to the entrypoint directory.
-- Keep response minimal: `<!doctype html>`, UTF-8 meta, stylesheet link, wrapped content.
+- Keep response minimal: `<!doctype html>`, UTF-8 and viewport meta, stylesheet link, deferred script, navigation controls, and wrapped content.
+- Keep CSS and JS URLs versioned using `md5_file()` on paths relative to `__DIR__`.
+- Do not assign anonymous functions or closures to PHP variables; use named functions or class methods.
+- Output helpers should return rendered content for callers to consume.
 - Do not remove `.md` extension guard.
 - Any path-handling changes must remain compatible with Windows paths.
 
-## Recommended Validation After Edits
+## Table of Contents Rules (`src/toc.js`)
-1. Open at least one Markdown file with:
+- Build navigation from rendered H1–H3 in `.markdown-body`, preserving order and indicating levels with indentation. Do not add a Markdown parser.
-   - headings (`#`, `##`, `###`)
+- Keep existing unique IDs, generate collision-free IDs for other headings, and retain native anchor navigation.
-   - lists
+- Use DOM creation and `textContent` for heading labels; do not insert untrusted content through `innerHTML`.
-   - fenced code block
+- Default to closed. Store panel state under `md2html:toc:` + pathname + query string, excluding the fragment.
-   - table
+- Handle unavailable localStorage without disabling navigation.
-   - blockquote
+- Maintain ARIA state, keyboard access, Escape dismissal, mobile close controls, and readable output without JavaScript.
-   - image
+
-2. Verify layout on desktop and mobile width.
+## Validation After Edits
-3. Verify links and code blocks remain readable.
+- Never use a browser or browser automation. Leave visual browser verification to Igor; use non-browser checks instead.
+- Run relevant checks from the project root:
+  - `php -l src/md2html.php`
+  - `php -l tests/render.php` when changing the PHP test helper.
+  - `node --check src/toc.js`
+  - `./tests/run.ps1`
+  - `git diff --check`
+- Tests require PHP with DOM, Composer dependencies, and Node.js supporting `node:test` and `--test-isolation=none`.
+- Keep regression coverage for heading levels, formatting, code fences, duplicate and existing anchors, Unicode, empty and long contents, URL-specific state, blocked storage, mobile dismissal, asset hashes, and the `.md` guard.
+- DOM doubles do not verify actual layout or scrolling. Igor manually checks desktop/mobile layout, long-panel scrolling, anchor navigation, and readability of Markdown elements.
 
 ## Non-Goals
 - Building a full CMS.

README.md

@@ -6,6 +6,7 @@ Zdrojove subory su v adresari `src/`:
 
 - `src/md2html.php`: vstupny bod konverzie Markdown do HTML.
 - `src/markdown.css`: styly vystupneho HTML.
+- `src/toc.js`: interaktivny obsah dokumentu bez externych JS zavislosti.
 
 Zavislosti sa instaluju cez `composer install` v koreni projektu do `vendor/`.
 Konfiguracia NGINX musi smerovat Markdown poziadavky na `src/md2html.php`.
@@ -29,3 +30,31 @@ Konfiguracia predpoklada projekt v adresari `md2html` pod `root` daneho servera
 Subor `fastcgi_params` musi byt dostupny v konfiguracii NGINX.
 
 Po uprave over konfiguraciu prikazom `nginx -t` a nacitaj ju prikazom `nginx -s reload`.
+
+## Obsah dokumentu
+
+Tlacidlo v lavom hornom rohu otvara obsah vytvoreny z nadpisov H1 az H3.
+Na desktope panel uvolni miesto vedla dokumentu, na mobile sa zobrazi ako overlay.
+Zatvorit ho mozno tlacidlom, klavesom Escape alebo na mobile kliknutim mimo panelu.
+Panel ma vlastne scrollovanie a odkazy smeruju na unikatne ID nadpisov.
+Existujuce jednoznacne ID zostavaju zachovane.
+
+Stav sa uklada do localStorage pod klucom `md2html:toc:` + pathname + query string,
+bez URL fragmentu. Pri nedostupnom ulozisku ovladanie funguje dalej.
+Bez JavaScriptu zostava dokument citatelny, navigacne ovladanie je skryte.
+
+## Testovanie
+
+Testy vyzaduju PHP s DOM rozsirenim, nainstalovane Composer zavislosti a Node.js
+s podporou `node:test` a `--test-isolation=none`. Nepouzivaju prehliadac ani dalsie balicky.
+V PowerShelli z korena projektu spusti:
+
+```powershell
+php -l src/md2html.php
+node --check src/toc.js
+./tests/run.ps1
+```
+
+Testy overuju realny vystup Parsedownu a JS spravanie pomocou modelu DOM.
+Vizualne rozlozenie, skutocne scrollovanie a ovladanie v prehliadaci treba overit
+manualne na desktope aj mobile.

src/markdown.css

@@ -9,6 +9,7 @@
   --quote-bg: #f4f8fa;
   --code-bg: #1f2328;
   --code-text: #f4f6f8;
+  --toc-width: 19rem;
 }
 
 *,
@@ -201,10 +202,164 @@ body {
 }
 
 .markdown-body :target {
-  scroll-margin-top: 1rem;
+  scroll-margin-top: 4.5rem;
   animation: mark-target 1.2s ease;
 }
 
+/* Navigation lives outside the rendered Markdown. */
+.md2html-document {
+  transition: margin-left 200ms ease;
+}
+
+.markdown-body :is(h1, h2, h3) {
+  scroll-margin-top: 4.5rem;
+}
+
+html:has(.md2html-toc-ready) {
+  scroll-behavior: smooth;
+}
+
+.md2html-toc-toggle,
+.md2html-toc-close {
+  display: inline-grid;
+  place-items: center;
+  width: 2.75rem;
+  height: 2.75rem;
+  padding: 0;
+  border: 1px solid var(--line);
+  border-radius: 8px;
+  color: var(--accent);
+  background: var(--paper-bg);
+  font: 1.25rem/1 sans-serif;
+  cursor: pointer;
+}
+
+.md2html-toc-toggle {
+  position: fixed;
+  top: 0.75rem;
+  left: 0.75rem;
+  z-index: 30;
+  box-shadow: 0 2px 6px #40312118;
+}
+
+.md2html-toc-toggle[hidden],
+.md2html-toc[hidden],
+.md2html-toc-backdrop[hidden] {
+  display: none;
+}
+
+.md2html-toc-toggle[aria-expanded="true"] {
+  color: var(--paper-bg);
+  background: var(--accent);
+}
+
+.md2html-toc :is(a, button):focus-visible,
+.md2html-toc-toggle:focus-visible {
+  outline: 3px solid var(--accent);
+  outline-offset: 2px;
+}
+
+.md2html-toc {
+  position: fixed;
+  z-index: 20;
+  top: 4rem;
+  bottom: 1rem;
+  left: 0.75rem;
+  width: var(--toc-width);
+  max-width: calc(100% - 4.5rem);
+  max-height: calc(100vh - 5rem);
+  max-height: calc(100dvh - 5rem);
+  overflow-y: auto;
+  overscroll-behavior: contain;
+  padding: 1rem;
+  border: 1px solid var(--line);
+  border-radius: 12px;
+  background: var(--paper-bg);
+  box-shadow: 0 8px 24px #40312120;
+  font: 0.95rem/1.5 "Segoe UI", sans-serif;
+  overflow-wrap: anywhere;
+  visibility: hidden;
+  transform: translateX(calc(-100% - 1rem));
+  transition: transform 200ms ease, visibility 200ms;
+}
+
+.md2html-toc-open .md2html-toc {
+  visibility: visible;
+  transform: translateX(0);
+}
+
+.md2html-toc-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 0.5rem;
+  margin-bottom: 0.75rem;
+}
+
+.md2html-toc-close {
+  flex-shrink: 0;
+}
+
+.md2html-toc-list {
+  list-style: none;
+  margin: 0;
+  padding: 0;
+}
+
+.md2html-toc-list a {
+  display: block;
+  padding: 0.4rem 0.25rem;
+  color: var(--accent);
+  text-decoration: none;
+  border-radius: 4px;
+}
+
+.md2html-toc-list a:hover {
+  background: var(--accent-soft);
+  text-decoration: underline;
+}
+
+.md2html-toc-level-2 { padding-left: 1rem; }
+.md2html-toc-level-3 { padding-left: 2rem; }
+
+.md2html-toc-backdrop { display: none; }
+
+@media (min-width: 761px) {
+  .md2html-toc-open .md2html-document {
+    margin-left: calc(var(--toc-width) + 1.5rem);
+  }
+}
+
+@media (max-width: 760px) {
+  .md2html-toc-ready .markdown-body {
+    margin-top: 4.25rem;
+  }
+
+  .md2html-toc-backdrop {
+    display: block;
+    position: fixed;
+    inset: 0;
+    z-index: 10;
+    background: #24201c55;
+    visibility: hidden;
+    opacity: 0;
+    transition: opacity 200ms ease, visibility 200ms;
+  }
+
+  .md2html-toc-open .md2html-toc-backdrop {
+    visibility: visible;
+    opacity: 1;
+  }
+}
+
+@media (prefers-reduced-motion: reduce) {
+  html:has(.md2html-toc-ready) { scroll-behavior: auto; }
+  .md2html-document,
+  .md2html-toc,
+  .md2html-toc-backdrop { transition: none; }
+  .markdown-body :target { animation: none; }
+}
+
 @keyframes mark-target {
   0% {
     background: #fff3c9;

src/md2html.php

@@ -14,7 +14,17 @@ $parser = new Parsedown();
 
 echo '<!doctype html>';
 echo '<meta charset="utf-8">';
-echo '<link rel="stylesheet" href="//localhost/md2html/src/markdown.css">';
+echo '<meta name="viewport" content="width=device-width, initial-scale=1">';
+echo '<link rel="stylesheet" href="//localhost/md2html/src/markdown.css?h=' . md5_file(__DIR__ . '/markdown.css') . '">';
+echo '<script src="//localhost/md2html/src/toc.js?h=' . md5_file(__DIR__ . '/toc.js') . '" defer></script>';
+echo '<button class="md2html-toc-toggle" type="button" aria-expanded="false" aria-label="Zobraziť obsah dokumentu" hidden><span aria-hidden="true">☰</span></button>';
+echo '<div class="md2html-toc-backdrop" aria-hidden="true" hidden></div>';
+echo '<nav class="md2html-toc" aria-label="Obsah dokumentu" hidden>';
+echo '<div class="md2html-toc-header"><strong>Obsah dokumentu</strong><button class="md2html-toc-close" type="button" aria-label="Zatvoriť obsah dokumentu">×</button></div>';
+echo '<ol class="md2html-toc-list"></ol>';
+echo '</nav>';
+echo '<div class="md2html-document">';
 echo '<div class="markdown-body">';
 echo $parser->text($md);
 echo '</div>';
+echo '</div>';

src/toc.js

@@ -0,0 +1,94 @@
+(() => {
+  'use strict';
+
+  const content = document.querySelector('.markdown-body');
+  const panel = document.querySelector('.md2html-toc');
+  const toggle = document.querySelector('.md2html-toc-toggle');
+  const close = document.querySelector('.md2html-toc-close');
+  const backdrop = document.querySelector('.md2html-toc-backdrop');
+  const list = document.querySelector('.md2html-toc-list');
+  if (!content || !panel || !toggle || !close || !backdrop || !list) return;
+
+  // Reserve all existing anchors, including anchors outside headings.
+  const usedIds = new Set(Array.from(document.querySelectorAll('[id]'), node => node.id));
+  function uniqueId(base) {
+    let id = base;
+    let suffix = 2;
+    while (usedIds.has(id)) id = `${base}-${suffix++}`;
+    usedIds.add(id);
+    return id;
+  }
+
+  panel.id = uniqueId('md2html-toc-panel');
+  toggle.setAttribute('aria-controls', panel.id);
+  const headings = content.querySelectorAll('h1, h2, h3');
+  const seenHeadingIds = new Set();
+  for (const heading of headings) {
+    const label = heading.textContent.trim() || 'Bez názvu';
+    if (!heading.id || seenHeadingIds.has(heading.id) || document.getElementById(heading.id) !== heading) {
+      const slug = label.normalize('NFC').toLowerCase()
+        .replace(/[^\p{L}\p{N}_-]+/gu, '-').replace(/^-+|-+$/g, '') || 'nadpis';
+      heading.id = uniqueId(slug);
+    }
+    seenHeadingIds.add(heading.id);
+
+    const item = document.createElement('li');
+    item.className = `md2html-toc-level-${heading.tagName.slice(1)}`;
+    const link = document.createElement('a');
+    link.setAttribute('href', `#${encodeURIComponent(heading.id)}`);
+    link.textContent = label;
+    link.addEventListener('click', () => {
+      if (window.matchMedia('(max-width: 760px)').matches) setOpen(false);
+      if (!heading.hasAttribute('tabindex')) heading.setAttribute('tabindex', '-1');
+      heading.focus({ preventScroll: true });
+      // Native anchor navigation updates the fragment and supports Back/Forward.
+    });
+    item.append(link);
+    list.append(item);
+  }
+  if (!headings.length) {
+    const message = document.createElement('p');
+    message.textContent = 'Obsah dokumentu nie je dostupný.';
+    list.replaceWith(message);
+  }
+
+  const storageKey = `md2html:toc:${window.location.pathname}${window.location.search}`;
+  let open = false;
+  function setOpen(value, persist = true) {
+    open = value;
+    document.body.classList.toggle('md2html-toc-open', open);
+    toggle.setAttribute('aria-expanded', String(open));
+    toggle.setAttribute('aria-label', open ? 'Zatvoriť obsah dokumentu' : 'Zobraziť obsah dokumentu');
+    panel.setAttribute('aria-hidden', String(!open));
+    panel.inert = !open;
+    if (!open && panel.contains(document.activeElement)) toggle.focus();
+    if (persist) {
+      try { window.localStorage.setItem(storageKey, String(open)); } catch { /* Storage is optional. */ }
+    }
+  }
+
+  let savedOpen = false;
+  try { savedOpen = window.localStorage.getItem(storageKey) === 'true'; } catch { /* Default to closed. */ }
+  setOpen(savedOpen, false);
+  panel.hidden = false;
+  toggle.hidden = false;
+  backdrop.hidden = false;
+  document.body.classList.add('md2html-toc-ready');
+  toggle.addEventListener('click', () => setOpen(!open));
+  close.addEventListener('click', () => { setOpen(false); toggle.focus(); });
+  backdrop.addEventListener('click', () => setOpen(false));
+  document.addEventListener('keydown', event => {
+    if (event.key === 'Escape' && open) {
+      setOpen(false);
+      toggle.focus();
+    }
+  });
+
+  // The browser may have tried to resolve the fragment before generated IDs existed.
+  if (window.location.hash) {
+    try {
+      const target = document.getElementById(decodeURIComponent(window.location.hash.slice(1)));
+      if (target && content.contains(target)) target.scrollIntoView();
+    } catch { /* Ignore malformed URL fragments. */ }
+  }
+})();