Function normalizeSelection

lib/web/CodeMirror/src/model/selection.js:64–80

(cm, ranges, primIndex)

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

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