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Filename : index.js
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'use strict'

exports.parse = parse
exports.stringify = stringify

var comma = ','
var space = ' '
var empty = ''

// Parse comma-separated tokens to an array.
function parse(value) {
  var values = []
  var input = String(value || empty)
  var index = input.indexOf(comma)
  var lastIndex = 0
  var end = false
  var val

  while (!end) {
    if (index === -1) {
      index = input.length
      end = true
    }

    val = input.slice(lastIndex, index).trim()

    if (val || !end) {
      values.push(val)
    }

    lastIndex = index + 1
    index = input.indexOf(comma, lastIndex)
  }

  return values
}

// Compile an array to comma-separated tokens.
// `options.padLeft` (default: `true`) pads a space left of each token, and
// `options.padRight` (default: `false`) pads a space to the right of each token.
function stringify(values, options) {
  var settings = options || {}
  var left = settings.padLeft === false ? empty : space
  var right = settings.padRight ? space : empty

  // Ensure the last empty entry is seen.
  if (values[values.length - 1] === empty) {
    values = values.concat(empty)
  }

  return values.join(right + comma + left).trim()
}