notepad-HTML/editor.html at main · necat101/notepad-HTML · 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>Offline Editor — Self-Contained</title>
<style>
  :root{
    --bg:#1e1e1e; --bg2:#252525; --panel:#2b2b2b; --fg:#d4d4d4; --muted:#9aa0a6;
    --accent:#2f71b4; --accent-hi:#3a8bc9; --ok:#2f9e44;
    --kw:#569cd6; --str:#ce9178; --com:#6a9955; --num:#b5cea8; --tag:#4fa4ff; --attr:#d7ba7d;
  }
  *{box-sizing:border-box}
  html,body{height:100%}
  body{margin:0;background:var(--bg);color:var(--fg);font-family:Segoe UI,system-ui,-apple-system,Arial,sans-serif;display:flex;flex-direction:column}
  header{background:var(--bg2);padding:10px;display:flex;gap:8px;align-items:center;flex-wrap:wrap}
  header input[type="text"],header select{background:#2d2d2d;border:1px solid #333;color:var(--fg);padding:7px 10px;border-radius:6px}
  header button{background:var(--accent);border:0;color:white;padding:8px 12px;border-radius:6px;cursor:pointer}
  header button:hover{background:var(--accent-hi)}
  .wrap{flex:1;display:flex;overflow:hidden}
  .editor{flex:1;position:relative;background:#1b1b1b;border-top:1px solid #2a2a2a}
  /* Input layer */
  textarea{
    position:absolute; inset:0; width:100%; height:100%;
    background:transparent; color:transparent; caret-color:#fff;
    border:0; resize:none; outline:none; padding:18px; font:14px/1.55 "Fira Code",ui-monospace,Consolas,Menlo,monospace;
    white-space:pre; overflow:auto; tab-size:2;
  }
  /* Highlight layer */
  pre{
    position:absolute; inset:0; margin:0; padding:18px; pointer-events:none;
    font:14px/1.55 "Fira Code",ui-monospace,Consolas,Menlo,monospace;
    color:var(--fg); white-space:pre-wrap; word-break:normal; overflow:auto;
  }
  /* Simple tokens */
  .tok-kw{color:var(--kw)}
  .tok-str{color:var(--str)}
  .tok-com{color:var(--com)}
  .tok-num{color:var(--num)}
  .tok-tag{color:var(--tag)}
  .tok-attr{color:var(--attr)}
  .status{background:var(--bg2);padding:6px 10px;color:var(--muted);font-size:12px;border-top:1px solid #2a2a2a}
</style>
</head>
<body>
  <header>
    <select id="lang">
      <option value="javascript">JavaScript</option>
      <option value="html">HTML</option>
      <option value="css">CSS</option>
      <option value="python">Python</option>
      <option value="xml">XML</option>
      <option value="plaintext">Plain Text</option>
    </select>
    <input id="filename" type="text" placeholder="filename" style="min-width:220px" />
    <button id="importBtn">Import</button>
    <button id="download">Export</button>
    <span style="flex-grow:1"></span>
    <input id="search" type="text" placeholder="Search…" />
    <input id="replace" type="text" placeholder="Replace with…" />
    <button id="replaceSel">Replace Selection</button>
    <button id="replaceAll">Replace All</button>
  </header>

  <div class="wrap">
    <div class="editor">
      <textarea id="ta" spellcheck="false">// Welcome! Type here.
// Switch language with the dropdown.
// Use Import to open a file, or Export to save.

function hello(name){
  const n = 42;
  console.log("Hello, " + name + "!");
}
hello("World");</textarea>
      <pre id="hl"></pre>
    </div>
  </div>
  <div class="status" id="status">Ready.</div>
  <input type="file" id="fileInput" style="display:none;" />

<script>
/* ---------- Tiny, offline highlighter (no external libs) ---------- */
/* Escaping */
const esc = s => s.replace(/&/g,"&amp;").replace(/</g,"&lt;").replace(/>/g,"&gt;");

/* Regex-based tokenizers (fast + small, not full parsers) */
function highlightJS(src){
  let s = esc(src);
  s = s
    .replace(/(\/\*[\s\S]*?\*\/|\/\/.*?$)/gm,'<span class="tok-com">$1</span>')
    .replace(/(["'`])(?:\\.|(?!\1)[\s\S])*?\1/g,'<span class="tok-str">$&</span>')
    .replace(/\b(?:function|return|const|let|var|if|else|for|while|class|extends|new|try|catch|finally|throw|switch|case|break|continue|import|from|export|default|await|async|yield|this|super|typeof|in|instanceof|delete|void)\b/g,'<span class="tok-kw">$&</span>')
    .replace(/\b\d(?:_?\d)*(\.\d(?:_?\d)*)?(?:[eE][+-]?\d+)?\b/g,'<span class="tok-num">$&</span>');
  return s;
}
function highlightCSS(src){
  let s = esc(src);
  s = s
    .replace(/\/\*[\s\S]*?\*\//g,'<span class="tok-com">$&</span>')
    .replace(/(["'])(?:\\.|(?!\1).)*\1/g,'<span class="tok-str">$&</span>')
    .replace(/([a-z-]+)\s*:/gi,'<span class="tok-attr">$1</span>:')
    .replace(/\b\d+(?:\.\d+)?(px|em|rem|%|vh|vw)?\b/g,'<span class="tok-num">$&</span>');
  return s;
}
function highlightHTML(src){
  let s = esc(src);
  s = s
    .replace(/(&lt;!--[\s\S]*?--&gt;)/g,'<span class="tok-com">$1</span>')
    .replace(/(&lt;\/?\s*)([a-zA-Z][\w:-]*)([^&]*?&gt;)/g,(m,p1,tag,p3)=>`${p1}<span class="tok-tag">${tag}</span>${p3}`)
    .replace(/([a-zA-Z:-]+)(=)("[^"]*"|'[^']*')/g,'<span class="tok-attr">$1</span>$2<span class="tok-str">$3</span>');
  return s;
}
function highlightXML(src){
  // XML ~= HTML without void tag quirks
  return highlightHTML(src);
}
function highlightPY(src){
  let s = esc(src);
  s = s
    .replace(/(#.*?$)/gm,'<span class="tok-com">$1</span>')
    .replace(/("""[\s\S]*?"""|'''[\s\S]*?'''|"(?:\\.|[^"\n])*"|'(?:\\.|[^'\n])*')/g,'<span class="tok-str">$1</span>')
    .replace(/\b(?:def|return|class|import|from|as|if|elif|else|for|while|try|except|finally|raise|with|lambda|pass|break|continue|yield|global|nonlocal|assert|in|is|not|and|or|True|False|None)\b/g,'<span class="tok-kw">$&</span>')
    .replace(/\b\d+(?:\.\d+)?\b/g,'<span class="tok-num">$&</span>');
  return s;
}

const highlighters = {
  javascript: highlightJS,
  html:       highlightHTML,
  css:        highlightCSS,
  python:     highlightPY,
  xml:        highlightXML,
  // "plaintext" is intentionally omitted to use the fallback
};

/* ---------- Editor wiring (textarea + overlay) ---------- */
const ta       = document.getElementById('ta');
const pre      = document.getElementById('hl');
const langSel  = document.getElementById('lang');
const status   = document.getElementById('status');
const filename = document.getElementById('filename');

function extFor(lang){
  return {javascript:'.js', html:'.html', css:'.css', python:'.py', xml:'.xml', plaintext:'.txt'}[lang] || '.txt';
}

function ensureFilenameExt(){
  const lang = langSel.value;
  // If in plaintext mode, don't force an extension.
  if (lang === 'plaintext') {
    if (!filename.value.trim()) filename.value = 'text.txt';
    return;
  }

  let name = filename.value.trim();
  const want = extFor(lang);
  if(!name){ filename.value = 'code' + want; return; }

  // Check if it already has the correct extension
  if (name.toLowerCase().endsWith(want)) return;

  // Replace other known extensions or append the new one
  const knownExtsRegex = /\.(js|html|css|py|xml|txt)$/i;
  if (knownExtsRegex.test(name)) {
    filename.value = name.replace(knownExtsRegex, want);
  } else {
    filename.value = name + want;
  }
}

function render(){
  const lang = langSel.value;
  const src  = ta.value;
  const fn   = highlighters[lang] || (s=>esc(s));
  pre.innerHTML = fn(src) + (src.endsWith('\n') ? '' : '\n'); // keep last line height
  const langDisplay = lang === 'plaintext' ? 'Plain Text' : lang.toUpperCase();
  status.textContent = `Language: ${langDisplay} — ${src.length} chars`;
}

function syncScroll(){
  pre.scrollTop  = ta.scrollTop;
  pre.scrollLeft = ta.scrollLeft;
}

function updateSpellcheckState() {
  const isPlainText = langSel.value === 'plaintext';
  ta.spellcheck = isPlainText;
}

ta.addEventListener('input', render);
ta.addEventListener('scroll', syncScroll);
langSel.addEventListener('change', ()=>{
  ensureFilenameExt();
  render();
  updateSpellcheckState();
});
filename.addEventListener('blur', ensureFilenameExt); // Also check when user leaves the input
window.addEventListener('resize', syncScroll);

// Initial state
render();
ensureFilenameExt();
updateSpellcheckState();

/* ---------- Search / Replace ---------- */
const q = document.getElementById('search');
const r = document.getElementById('replace');
document.getElementById('replaceSel').addEventListener('click', ()=>{
  const start = ta.selectionStart, end = ta.selectionEnd;
  const val = ta.value;
  ta.value = val.slice(0,start) + (r.value ?? '') + val.slice(end);
  ta.selectionStart = ta.selectionEnd = start + (r.value ?? '').length;
  ta.focus();
  render();
});
document.getElementById('replaceAll').addEventListener('click', ()=>{
  if(!q.value) return;
  const safe = q.value.replace(/[.*+?^${}()|[\]\\]/g,'\\$&');
  const re = new RegExp(safe,'g');
  ta.value = ta.value.replace(re, r.value ?? '');
  render();
});

/* ---------- Import / Export ---------- */
const importBtn = document.getElementById('importBtn');
const fileInput = document.getElementById('fileInput');

importBtn.addEventListener('click', () => {
  fileInput.click(); // Trigger the hidden file input
});

fileInput.addEventListener('change', (event) => {
  const file = event.target.files[0];
  if (!file) return;

  const reader = new FileReader();
  reader.onload = (e) => {
    // Set the textarea content
    ta.value = e.target.result;

    // Auto-detect language from file extension
    const ext = file.name.split('.').pop().toLowerCase();
    const langMap = {
        js: 'javascript', html: 'html', htm: 'html', css: 'css',
        py: 'python', xml: 'xml', txt: 'plaintext'
    };
    langSel.value = langMap[ext] || 'plaintext'; // Default to plaintext

    // Update filename input
    filename.value = file.name;

    // Re-render the editor with new content and language
    render();
    syncScroll();
    updateSpellcheckState(); // Update spellcheck based on new language
  };
  reader.onerror = () => {
    status.textContent = "Error reading file.";
  }
  reader.readAsText(file);

  // Reset file input to allow opening the same file again
  fileInput.value = '';
});

document.getElementById('download').addEventListener('click', ()=>{
  ensureFilenameExt();
  const name = filename.value.trim() || ('code' + extFor(langSel.value));
  const blob = new Blob([ta.value], {type: 'text/plain;charset=utf-8'});
  const a = document.createElement('a');
  a.href = URL.createObjectURL(blob);
  a.download = name;
  document.body.appendChild(a);
  a.click();
  setTimeout(()=>{ URL.revokeObjectURL(a.href); a.remove(); }, 0);
});
</script>
</body>
</html>