Function cursorCoords

external/.scrollLibs.js:3997–4037

(cm, pos, context, lineObj, preparedMeasure, varHeight)

  // Every position after the last character on a line is considered to stick
  // to the last character on the line.
  function cursorCoords(cm, pos, context, lineObj, preparedMeasure, varHeight) {
    lineObj = lineObj || getLine(cm.doc, pos.line)
    if (!preparedMeasure) {
      preparedMeasure = prepareMeasureForLine(cm, lineObj)
    }
    function get(ch, right) {
      var m = measureCharPrepared(cm, preparedMeasure, ch, right ? "right" : "left", varHeight)
      if (right) {
        m.left = m.right
      } else {
        m.right = m.left
      }
      return intoCoordSystem(cm, lineObj, m, context)
    }
    var order = getOrder(lineObj, cm.doc.direction),
      ch = pos.ch,
      sticky = pos.sticky
    if (ch >= lineObj.text.length) {
      ch = lineObj.text.length
      sticky = "before"
    } else if (ch <= 0) {
      ch = 0
      sticky = "after"
    }
    if (!order) {
      return get(sticky == "before" ? ch - 1 : ch, sticky == "before")
    }

    function getBidi(ch, partPos, invert) {
      var part = order[partPos],
        right = part.level == 1
      return get(invert ? ch - 1 : ch, right != invert)
    }
    var partPos = getBidiPartAt(order, ch, sticky)
    var other = bidiOther
    var val = getBidi(ch, partPos, sticky == "before")
    if (other != null) {
      val.other = getBidi(ch, other, sticky != "before")
    }
    return val
  }

  // Used to cheaply estimate the coordinates for a position. Used for
  // intermediate scroll updates.