Function normalizeSelection

external/.scrollLibs.js:6362–6384

(cm, ranges, primIndex)

  // build a selection out of it. 'Consumes' ranges array (modifying
  // it).
  function normalizeSelection(cm, ranges, primIndex) {
    var mayTouch = cm && cm.options.selectionsMayTouch
    var prim = ranges[primIndex]
    ranges.sort(function (a, b) {
      return cmp(a.from(), b.from())
    })
    primIndex = indexOf(ranges, prim)
    for (var i = 1; i < ranges.length; i++) {
      var cur = ranges[i],
        prev = ranges[i - 1]
      var diff = cmp(prev.to(), cur.from())
      if (mayTouch && !cur.empty() ? diff > 0 : diff >= 0) {
        var from = minPos(prev.from(), cur.from()),
          to = maxPos(prev.to(), cur.to())
        var inv = prev.empty() ? cur.from() == cur.head : prev.from() == prev.head
        if (i <= primIndex) {
          --primIndex
        }
        ranges.splice(--i, 2, new Range(inv ? to : from, inv ? from : to))
      }
    }
    return new Selection(ranges, primIndex)
  }

  function simpleSelection(anchor, head) {
    return new Selection([new Range(anchor, head || anchor)], 0)