okunishinishi/node-tmplconv

/**
 * @function _rule
 * @private
 */

'use strict'

const findout = require('findout')
const stringcase = require('stringcase')

const variations = [
  'camelcase',
  'pascalcase',
  'spinalcase',
  'snakecase',
  'uppercase',
  'lowercase',
  'enumcase',
  'cramcase'
]

/** @lends _rule */
function _rule (data, prefix = '_____', suffix = '_____') {
  if (typeof data === 'string') {
    data = findout(data) || data
  }
  data = data || {}
  const _fix = (key) => [ prefix, key, suffix ].join('')

  let rule = {}
  Object.keys(data).forEach((key) => {
    let val = data[ key ]
    rule[ _fix(key) ] = val
    variations.forEach((variation) => {
      if (!stringcase[ variation ]) {
        console.warn('Unknown variation:', variation)
        return
      }
      rule[ _fix([ key, variation ].join('@')) ] = stringcase[ variation ](val)
    })
  })
  return rule
}

_rule.reversed = function _reversedRule (data, prefix, suffix) {
  let rule = _rule(data, prefix, suffix)
  let reversed = {}
  Object.keys(rule).forEach((key) => {
    let val = rule[ key ]
    reversed[ val ] = reversed[ val ] || key
  })
  return reversed
}

module.exports = _rule