Function eachParent

node.js:72–103

(file, callback, cache)

}

function eachParent(file, callback, cache) {
  var loc = path.resolve(file)
  var pathsForCacheResult = []
  var result
  do {
    if (!pathInRoot(loc)) {
      break
    }
    if (cache && loc in cache) {
      result = cache[loc]
      break
    }
    pathsForCacheResult.push(loc)

    if (!isDirectory(loc)) {
      continue
    }

    var locResult = callback(loc)
    if (typeof locResult !== 'undefined') {
      result = locResult
      break
    }
  } while (loc !== (loc = path.dirname(loc)))

  if (cache && !process.env.BROWSERSLIST_DISABLE_CACHE) {
    pathsForCacheResult.forEach(function (cachePath) {
      cache[cachePath] = result
    })
  }
  return result
}

function pathInRoot(p) {
  if (!process.env.BROWSERSLIST_ROOT_PATH) return true