Function nodeAndOffsetInLineMap

external/.scrollLibs.js:3710–3752

(map$$1, ch, bias)

  var nullRect = { left: 0, right: 0, top: 0, bottom: 0 }

  function nodeAndOffsetInLineMap(map$$1, ch, bias) {
    var node, start, end, collapse, mStart, mEnd
    // First, search the line map for the text node corresponding to,
    // or closest to, the target character.
    for (var i = 0; i < map$$1.length; i += 3) {
      mStart = map$$1[i]
      mEnd = map$$1[i + 1]
      if (ch < mStart) {
        start = 0
        end = 1
        collapse = "left"
      } else if (ch < mEnd) {
        start = ch - mStart
        end = start + 1
      } else if (i == map$$1.length - 3 || (ch == mEnd && map$$1[i + 3] > ch)) {
        end = mEnd - mStart
        start = end - 1
        if (ch >= mEnd) {
          collapse = "right"
        }
      }
      if (start != null) {
        node = map$$1[i + 2]
        if (mStart == mEnd && bias == (node.insertLeft ? "left" : "right")) {
          collapse = bias
        }
        if (bias == "left" && start == 0) {
          while (i && map$$1[i - 2] == map$$1[i - 3] && map$$1[i - 1].insertLeft) {
            node = map$$1[(i -= 3) + 2]
            collapse = "left"
          }
        }
        if (bias == "right" && start == mEnd - mStart) {
          while (i < map$$1.length - 3 && map$$1[i + 3] == map$$1[i + 4] && !map$$1[i + 5].insertLeft) {
            node = map$$1[(i += 3) + 2]
            collapse = "right"
          }
        }
        break
      }
    }
    return { node: node, start: start, end: end, collapse: collapse, coverStart: mStart, coverEnd: mEnd }
  }

  function getUsefulRect(rects, bias) {
    var rect = nullRect