tools/markdown-html-diff.html at main · jubilancy/tools · 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>Markdown to HTML Diff | tools.eliana.lol</title>
  <link rel="stylesheet" href="global.css" />
  <link rel="icon" type="image/x-icon" href="favicon.svg" />
  <script src="https://cdnjs.cloudflare.com/ajax/libs/marked/12.0.2/marked.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/7.9.0/d3.min.js"></script>
  <style>
    .container {
      display: flex;
      flex-direction: column;
      gap: 1.5rem;
    }

    .input-group {
      display: flex;
      flex-direction: column;
      gap: 0.5rem;
    }

    .input-label {
      font-size: 0.85rem;
      font-weight: bold;
      text-transform: uppercase;
      color: var(--puny);
      letter-spacing: 0.05em;
    }

    .button-group {
      display: flex;
      flex-wrap: wrap;
      gap: 0.75rem;
    }

    button {
      flex: 0 1 auto;
      min-width: 120px;
      padding: 10px;
      cursor: pointer;
      font-family: monospace;
      border: 1px solid var(--text);
      background: var(--bg);
      color: var(--text);
      border-radius: 4px;
      transition: all 150ms;
    }

    button:hover {
      background-color: var(--hover);
      border-color: var(--accent);
    }

    button.primary {
      border-color: var(--accent);
      font-weight: bold;
      color: var(--accent);
    }

    textarea {
      width: 100%;
      font-family: monospace;
      padding: 10px;
      border: 1px solid var(--puny);
      background: var(--bg);
      color: var(--text);
      box-sizing: border-box;
      border-radius: 4px;
      font-size: 0.9rem;
      min-height: 220px;
      resize: vertical;
    }

    .status {
      padding: 0.75rem 1rem;
      border-radius: 4px;
      margin: 0.5rem 0;
      display: none;
      font-size: 0.9rem;
    }

    .status.show {
      display: block;
    }

    .status.success {
      background-color: rgba(16, 185, 129, 0.1);
      border-left: 3px solid var(--accent);
      color: var(--accent);
    }

    .info-box {
      padding: 1rem;
      background-color: var(--highlight);
      border-left: 3px solid var(--accent);
      font-size: 0.9rem;
      line-height: 1.6;
    }

    @media (max-width: 600px) {
      .button-group {
        flex-direction: column;
      }

      button {
        width: 100%;
      }
      .panel-grid {
        grid-template-columns: 1fr !important;
      }
    }

    /* Tool-specific styles */
    .panel-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1rem;
    }

    .panel {
      border: 1px solid var(--puny);
      border-radius: 4px;
      padding: 12px;
      display: flex;
      flex-direction: column;
      gap: 8px;
      min-height: 200px;
      max-height: 400px;
      overflow: auto;
    }

    .panel-title {
      font-size: 0.75rem;
      text-transform: uppercase;
      color: var(--puny);
      letter-spacing: 0.05em;
      border-bottom: 1px solid var(--hover);
      padding-bottom: 6px;
    }

    .rendered-output {
      font-size: 0.9rem;
    }

    .rendered-output h1, .rendered-output h2, .rendered-output h3 {
      margin: 0.5em 0 0.3em;
    }

    .rendered-output p {
      margin: 0.4em 0;
    }

    .rendered-output code {
      background: var(--hover);
      padding: 1px 4px;
      border-radius: 3px;
    }

    .html-source {
      font-family: monospace;
      font-size: 0.75rem;
      white-space: pre-wrap;
      word-break: break-word;
    }

    #ast-svg {
      width: 100%;
      min-height: 400px;
    }

    .full-width-panel {
      grid-column: 1 / -1;
    }
  </style>
</head>
<body>
  <nav>
    <div class="left">
      <a href="index.html">home</a> | <a href="extra.html">extra</a> |
      <a href="credits.html">credits</a> |
      <a href="changelog.html">logs</a>
    </div>
    <div class="right">
      <button id="theme-toggle">[theme]</button> |
      <a href="https://eliana.lol">site</a>
    </div>
  </nav>

  <main>
    <h1>Markdown to HTML Diff</h1>
    <p class="puny">Show Markdown source and rendered HTML side by side, with the AST tree in a third panel.</p>

    <div class="container">
      <div class="input-group">
        <span class="input-label">Markdown source</span>
        <textarea id="md-input"># Heading one

Some **bold** text and a [link](https://example.com).

## Subheading

- item one
- item two
  - nested item

> A blockquote here.

```js
const x = 1;
```
</textarea>
      </div>

      <div class="panel-grid">
        <div class="panel">
          <span class="panel-title">Rendered HTML (preview)</span>
          <div class="rendered-output" id="rendered-output"></div>
        </div>
        <div class="panel">
          <span class="panel-title">Raw HTML source</span>
          <div class="html-source" id="html-source"></div>
        </div>
      </div>

      <div class="panel full-width-panel" style="max-height: none;">
        <span class="panel-title">AST tree (token structure)</span>
        <svg id="ast-svg"></svg>
      </div>

      <div class="info-box">
        <strong>Tip:</strong> The AST tree shows how marked.js tokenizes your markdown into a structured tree before turning it into HTML — useful for understanding why nested lists, code blocks, or inline formatting render the way they do.
      </div>

      <div class="status" id="status"></div>
    </div>
  </main>

  <footer style="margin-top: 4rem; text-align: center" class="puny">
    © 2026 eliana.lol • <a href="credits.html">credits</a>
  </footer>

  <!-- Theme Toggle Script (Required for all tools) -->
  <script>
    const html = document.documentElement;
    const toggle = document.getElementById('theme-toggle');
    const saved =
      localStorage.getItem('theme') ||
      (window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light');

    html.setAttribute('data-theme', saved);
    if (toggle) toggle.innerText = saved === 'dark' ? '[light]' : '[dark]';

    if (toggle) {
      toggle.onclick = () => {
        const now = html.getAttribute('data-theme');
        const next = now === 'dark' ? 'light' : 'dark';
        html.setAttribute('data-theme', next);
        localStorage.setItem('theme', next);
        toggle.innerText = next === 'dark' ? '[light]' : '[dark]';
      };
    }
  </script>

  <!-- Tool-specific script -->
  <script>
    function showStatus(message, type = 'success') {
      const status = document.getElementById('status');
      status.textContent = message;
      status.className = `status show ${type}`;
      setTimeout(() => status.classList.remove('show'), 2000);
    }

    function tokenToNode(token, idx) {
      const node = {
        name: token.type + (token.depth ? ` (h${token.depth})` : ''),
        children: []
      };

      if (token.tokens && token.tokens.length) {
        node.children = token.tokens.map((t, i) => tokenToNode(t, i));
      }
      if (token.items && token.items.length) {
        node.children = token.items.map((item, i) => {
          const itemNode = { name: 'list_item', children: [] };
          if (item.tokens) itemNode.children = item.tokens.map((t, j) => tokenToNode(t, j));
          return itemNode;
        });
      }

      return node;
    }

    function buildTree(markdown) {
      const tokens = marked.lexer(markdown);
      const root = { name: 'document', children: tokens.map((t, i) => tokenToNode(t, i)) };
      return root;
    }

    function renderAst(root) {
      const svg = d3.select('#ast-svg');
      svg.selectAll('*').remove();

      const container = document.getElementById('ast-svg').parentElement;
      const width = container.clientWidth - 40 || 700;

      const hierarchy = d3.hierarchy(root, (d) => d.children);
      const treeLayout = d3.tree().size([width - 60, 0]).nodeSize([90, 50]);
      treeLayout(hierarchy);

      let maxDepth = 0;
      hierarchy.each((d) => { if (d.depth > maxDepth) maxDepth = d.depth; });
      const height = (maxDepth + 1) * 60 + 40;

      svg.attr('width', width).attr('height', height).attr('viewBox', `0 0 ${width} ${height}`);

      const g = svg.append('g').attr('transform', 'translate(30, 20)');

      g.selectAll('path.link')
        .data(hierarchy.links())
        .join('path')
        .attr('class', 'link')
        .attr('fill', 'none')
        .attr('stroke', 'currentColor')
        .attr('stroke-opacity', 0.3)
        .attr('d', d3.linkVertical().x((d) => d.x).y((d) => d.depth * 60));

      const node = g.selectAll('g.node')
        .data(hierarchy.descendants())
        .join('g')
        .attr('transform', (d) => `translate(${d.x}, ${d.depth * 60})`);

      node.append('rect')
        .attr('x', -45)
        .attr('y', -14)
        .attr('width', 90)
        .attr('height', 28)
        .attr('rx', 4)
        .attr('fill', (d) => d.depth === 0 ? '#ff6600' : '#0ea5e9')
        .attr('fill-opacity', 0.15)
        .attr('stroke', (d) => d.depth === 0 ? '#ff6600' : '#0ea5e9');

      node.append('text')
        .attr('text-anchor', 'middle')
        .attr('dy', 4)
        .attr('font-size', '10px')
        .attr('font-family', 'monospace')
        .attr('fill', 'currentColor')
        .text((d) => d.data.name.length > 14 ? d.data.name.slice(0, 13) + '…' : d.data.name);
    }

    function render() {
      const markdown = document.getElementById('md-input').value;

      let htmlOutput = '';
      try {
        htmlOutput = marked.parse(markdown);
      } catch (err) {
        document.getElementById('rendered-output').innerHTML = '<p class="puny">Could not parse markdown.</p>';
        return;
      }

      document.getElementById('rendered-output').innerHTML = htmlOutput;
      document.getElementById('html-source').textContent = formatHtml(htmlOutput);

      try {
        const tree = buildTree(markdown);
        renderAst(tree);
      } catch (err) {
        // AST rendering is best-effort
      }
    }

    function formatHtml(htmlStr) {
      // simple pretty-print: add newlines after closing tags for readability
      return htmlStr
        .replace(/></g, '>\n<')
        .trim();
    }

    document.getElementById('md-input').addEventListener('input', render);
    window.addEventListener('resize', render);
    render();
  </script>
</body>
</html>