Function handleKeyBinding

static/js/codemirror/codemirror.js:1882–1914

(cm, e)

  var maybeTransition;
  function handleKeyBinding(cm, e) {
    // Handle auto keymap transitions
    var startMap = getKeyMap(cm.options.keyMap), next = startMap.auto;
    clearTimeout(maybeTransition);
    if (next && !isModifierKey(e)) maybeTransition = setTimeout(function() {
      if (getKeyMap(cm.options.keyMap) == startMap)
        cm.options.keyMap = (next.call ? next.call(null, cm) : next);
    }, 50);

    var name = keyName(e, true), handled = false;
    if (!name) return false;
    var keymaps = allKeyMaps(cm);

    if (e.shiftKey) {
      // First try to resolve full name (including 'Shift-'). Failing
      // that, see if there is a cursor-motion command (starting with
      // 'go') bound to the keyname without 'Shift-'.
      handled = lookupKey("Shift-" + name, keymaps, function(b) {return doHandleBinding(cm, b, true);})
             || lookupKey(name, keymaps, function(b) {
                  if (typeof b == "string" && /^go[A-Z]/.test(b)) return doHandleBinding(cm, b);
                });
    } else {
      handled = lookupKey(name, keymaps, function(b) { return doHandleBinding(cm, b); });
    }
    if (handled == "stop") handled = false;

    if (handled) {
      e_preventDefault(e);
      restartBlink(cm);
      if (ie_lt9) { e.oldKeyCode = e.keyCode; e.keyCode = 0; }
    }
    return handled;
  }

  function handleCharBinding(cm, e, ch) {
    var handled = lookupKey("'" + ch + "'", allKeyMaps(cm),