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