Function deleteNearSelection

samples/common/codehighlight/codemirror.js:6809–6830

(cm, compute)

  // Helper for deleting text near the selection(s), used to implement
  // backspace, delete, and similar functionality.
  function deleteNearSelection(cm, compute) {
    var ranges = cm.doc.sel.ranges, kill = [];
    // Build up a set of ranges to kill first, merging overlapping
    // ranges.
    for (var i = 0; i < ranges.length; i++) {
      var toKill = compute(ranges[i]);
      while (kill.length && cmp(toKill.from, lst(kill).to) <= 0) {
        var replaced = kill.pop();
        if (cmp(replaced.from, toKill.from) < 0) {
          toKill.from = replaced.from;
          break
        }
      }
      kill.push(toKill);
    }
    // Next, remove those actual ranges.
    runInOp(cm, function () {
      for (var i = kill.length - 1; i >= 0; i--)
        { replaceRange(cm.doc, "", kill[i].from, kill[i].to, "+delete"); }
      ensureCursorVisible(cm);
    });
  }

  function moveCharLogically(line, ch, dir) {
    var target = skipExtendingChars(line.text, ch + dir, dir);