Function countColumn

external/.scrollLibs.js:673–689

(string, end, tabSize, startIndex, startValue)

  // Counts the column offset in a string, taking tabs into account.
  // Used mostly to find indentation.
  function countColumn(string, end, tabSize, startIndex, startValue) {
    if (end == null) {
      end = string.search(/[^\s\u00a0]/)
      if (end == -1) {
        end = string.length
      }
    }
    for (var i = startIndex || 0, n = startValue || 0; ; ) {
      var nextTab = string.indexOf("\t", i)
      if (nextTab < 0 || nextTab >= end) {
        return n + (end - i)
      }
      n += nextTab - i
      n += tabSize - (n % tabSize)
      i = nextTab + 1
    }
  }

  var Delayed = function () {
    this.id = null