@clynn-fe/akfe-editor-jsonc/lib/utils.ts

JSON Compress by using a map to reduce the size of keys and using gzip

export const unique = <T>(arr: T[]) => [...new Set(arr)]

export const isObject = (obj: any) => toString.call(obj) === '[object Object]'

/**
 * Converts a bidimensional array to object
 */
export const biDimensionalArrayToObject = <T>(
  arr: [string | number, T][]
): { [key: string]: T; [key: number]: T } =>
  arr.reduce(
    (prev, [key, value]) =>
      Object.assign(prev, {
        [key]: value
      }),
    {}
  )

/**
 * Convert a number to their ascii code/s.
 */
export const numberToKey = (
  index: number,
  totalChar?: number,
  offset?: number
) => {
  const sKeys = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'
  const aArr: number[] = []
  let currentChar = index
  totalChar = totalChar || sKeys.length
  offset = offset || 0
  while (currentChar >= totalChar) {
    aArr.push(sKeys.charCodeAt((currentChar % totalChar) + offset))
    currentChar = Math.floor(currentChar / totalChar - 1)
  }
  aArr.push(sKeys.charCodeAt(currentChar + offset))
  return aArr.reverse()
}

/**
 * 使用给定的 map oKeys 来替换 obj 里的 key
 * 该方法不改变传入的 obj
 */
export const transformKeys = (
  obj: any,
  oKeys: { [key: string]: string },
  target = {}
): any => {
  if (Array.isArray(obj)) {
    return obj.map(item => transformKeys(item, oKeys))
  } else if (isObject(obj)) {
    Object.entries(obj).forEach(([key, value]) => {
      const newKey = oKeys[key] /* c8 ignore next */ ?? key
      switch (true) {
        case Array.isArray(value):
          Object.assign(target, {
            [newKey]: (value as []).map(item => transformKeys(item, oKeys))
          })
          break
        case isObject(value):
          Object.assign(target, {
            [newKey]: transformKeys(value, oKeys)
          })
          break
        default:
          Object.assign(target, {
            [newKey]: value
          })
      }
    })
    return target
  } else {
    return obj
  }
}