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Filename : complete.html
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<!doctype html>

<title>CodeMirror: Autocomplete Demo</title>
<meta charset="utf-8"/>
<link rel=stylesheet href="../html/docs.css">

<link rel="stylesheet" href="/usr/share/javascript/codemirror/lib/codemirror.css">
<link rel="stylesheet" href="/usr/share/javascript/codemirror/addon/hint/show-hint.css">
<script src="/usr/share/javascript/codemirror/lib/codemirror.js"></script>
<script src="/usr/share/javascript/codemirror/addon/hint/show-hint.js"></script>
<script src="/usr/share/javascript/codemirror/addon/hint/javascript-hint.js"></script>
<script src="/usr/share/javascript/codemirror/mode/javascript/javascript.js"></script>
<script src="/usr/share/javascript/codemirror/mode/markdown/markdown.js"></script>

<div id=nav>
  <a href="https://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../html/logo.png"></a>

  <ul>
    <li><a href="../index.html">Home</a>
    <li><a href="../html/manual.html">Manual</a>
    <li><a href="https://github.com/codemirror/codemirror">Code</a>
  </ul>
  <ul>
    <li><a class=active href="#">Autocomplete</a>
  </ul>
</div>

<article>
<h2>Autocomplete Demo</h2>
<form><textarea id="code" name="code">
function getCompletions(token, context) {
  var found = [], start = token.string;
  function maybeAdd(str) {
    if (str.indexOf(start) == 0) found.push(str);
  }
  function gatherCompletions(obj) {
    if (typeof obj == "string") forEach(stringProps, maybeAdd);
    else if (obj instanceof Array) forEach(arrayProps, maybeAdd);
    else if (obj instanceof Function) forEach(funcProps, maybeAdd);
    for (var name in obj) maybeAdd(name);
  }

  if (context) {
    // If this is a property, see if it belongs to some object we can
    // find in the current environment.
    var obj = context.pop(), base;
    if (obj.className == "js-variable")
      base = window[obj.string];
    else if (obj.className == "js-string")
      base = "";
    else if (obj.className == "js-atom")
      base = 1;
    while (base != null && context.length)
      base = base[context.pop().string];
    if (base != null) gatherCompletions(base);
  }
  else {
    // If not, just look in the window object and any local scope
    // (reading into JS mode internals to get at the local variables)
    for (var v = token.state.localVars; v; v = v.next) maybeAdd(v.name);
    gatherCompletions(window);
    forEach(keywords, maybeAdd);
  }
  return found;
}
</textarea></form>

<p>Press <strong>ctrl-space</strong> to activate autocompletion. Built
on top of the <a href="../html/manual.html#addon_show-hint"><code>show-hint</code></a>
and <a href="../html/manual.html#addon_javascript-hint"><code>javascript-hint</code></a>
addons.</p>

<form><textarea style="display: none" id="synonyms" name="synonyms">
Here, the completion use an asynchronous hinting function to provide
synonyms for each words. If your browser support `Promises`, the
hinting function can also return one.
</textarea></form>

<script>
var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
  lineNumbers: true,
  extraKeys: {"Ctrl-Space": "autocomplete"},
  mode: {name: "javascript", globalVars: true}
});

if (typeof Promise !== "undefined") {
  var comp = [
    ["here", "hither"],
    ["asynchronous", "nonsynchronous"],
    ["completion", "achievement", "conclusion", "culmination", "expirations"],
    ["hinting", "advise", "broach", "imply"],
    ["function","action"],
    ["provide", "add", "bring", "give"],
    ["synonyms", "equivalents"],
    ["words", "token"],
    ["each", "every"],
  ]

  function synonyms(cm, option) {
    return new Promise(function(accept) {
      setTimeout(function() {
        var cursor = cm.getCursor(), line = cm.getLine(cursor.line)
        var start = cursor.ch, end = cursor.ch
        while (start && /\w/.test(line.charAt(start - 1))) --start
        while (end < line.length && /\w/.test(line.charAt(end))) ++end
        var word = line.slice(start, end).toLowerCase()
        for (var i = 0; i < comp.length; i++) if (comp[i].indexOf(word) != -1)
          return accept({list: comp[i],
                         from: CodeMirror.Pos(cursor.line, start),
                         to: CodeMirror.Pos(cursor.line, end)})
        return accept(null)
      }, 100)
    })
  }

  var editor2 = CodeMirror.fromTextArea(document.getElementById("synonyms"), {
    extraKeys: {"Ctrl-Space": "autocomplete"},
    lineNumbers: true,
    lineWrapping: true,
    mode: "text/x-markdown",
    hintOptions: {hint: synonyms}
  })
}
</script>

</article>