steam-acf2json/main.js

A parser for Steam's appmanifest .acf files.

const acfParser = {}

function parseKV(text) {
  const input = text.split(/\t/g)

  const filtered = input.filter(v => {
    return v !== ''
  })

  const obj = {}
  obj[filtered[0]] = filtered[1]
  return obj
}

acfParser.decode = function decode(text) {
  text = text.replace(/"([^"]+(?="))"/g, '$1')

  const result = {}
  const lines = text.split(/[\r]?\n/g)
  let stack = []
  let currentKey
  let parentNode = {}
  let currentNode = {}

  for (let i = 0; i < lines.length; i++) {

    if (lines[i + 1] === '') break

    let nextLine = lines[i + 1].replace(/\t/g, '')

    // 入栈
    if (nextLine === '{') {
      // 推送新节点到当前节点，并设置为当前节点
      currentKey = lines[i].replace(/\t/g, '')

      if (Object.keys(parentNode).length === 0) {
        parentNode = result
        stack.push(parentNode)
      } else {
        stack.push(currentNode)
        parentNode = currentNode
      }
      parentNode[currentKey] = {}
      currentNode = parentNode[currentKey]
    }

    let formatted = lines[i].replace(/\t/g, '')
    if (formatted !== '{' && formatted !== '}' && formatted !== currentKey) {
      let obj = parseKV(lines[i])
      let key = Object.keys(obj)[0]
      currentNode[key] = obj[key]
    }

    // 出栈
    if (nextLine === '}') {
      // 弹出当前节点 并 设置父节点为当前
      currentNode = stack.pop()
    }
  }

  return result
}

function getTab(number) {

  let result = ''
  for (let i = 0; i < number; i++) {
    result += `\t`
  }
  return result
}

acfParser.encode = function encode(obj) {

  let result = ''

  function encode(obj, indent = 0) {

    for (const [key, value] of Object.entries(obj)) {

      if (typeof value === 'object') {
        result = result + `${getTab(indent)}"${key}"\n${getTab(indent)}{\n`
        const nextObjFirstType = typeof value[Object.keys(value)[0]]
        encode(value, indent + 1)
        result = result + `${getTab(indent)}}\n`
      }

      if (typeof value === 'string') {
        result = result + `${getTab(indent)}"${key}"${getTab(2)}"${value}"\n`
      }
    }
  }

  encode(obj, 0, true)
  return result
}
module.exports = acfParser