aco-reader/index.js

Transform aco files to JSON format

const fs = require('fs')
// const dropRight = require('lodash/fp/dropRight')
// const chunk = require('lodash/fp/chunk')

const PROTOCOL_SIZE = 1
const NUMBER_OF_COLORS_SIZE = 1
const HEADER_SIZE = PROTOCOL_SIZE + NUMBER_OF_COLORS_SIZE
// v1 protocol number of chunks for one color.
const COLOR_SIZE = 5

const extractPalette = (data) => {
  const parts = data.match(/.{1,4}/g)
  const [
    version,
    numberOfColors,
    ...rest
  ] = parts

  // const colorsChunks = chunk(
  //   COLOR_SIZE,
  //   rest.slice(0, numberOfColors * COLOR_SIZE)
  // )
  //
  // const colors = colorsChunks.map(colorChunks => {
  //   // colorChunks.map(chunk => chunk)
  //   const [colorSpace , w, x, y, z] = colorChunks.map(chunk => chunk.substr(2))
  //   return { w, x, y }
  // })
  //
  // console.log(colors)

  // Let's skip the v1 protocol.
  const protocolOneSize = HEADER_SIZE + numberOfColors * COLOR_SIZE
  const protocolTwoColorsChunks = rest.slice(protocolOneSize)

  function split(chunks) {
    const [ colorSpace, w, x, y, z, , nameSizeHex, ...rest] = chunks

    const nameSize = parseInt(nameSizeHex, 16)
    const name = rest.slice(0, nameSize - 1)
      .map(s => String.fromCharCode(parseInt(s.toString(16), 16)))
      .join('')

    const getHex = (color) => color.slice(0, 2)
    const hex = `#${getHex(w)}${getHex(x)}${getHex(y)}`

    const color = {
      name,
      hex,
      w,
      x,
      y,
    }

    const nextColor = rest.slice(nameSize)

    return nextColor.length ?
      [color, ...split(nextColor)] : [color]
  }

  const palette = split(protocolTwoColorsChunks)
  return palette
}

function toJSON (file, callback) {
	fs.readFile(
		file, 'hex',
    (error, data) => {
      return !error ?
        callback(null, extractPalette(data)) :
        callback(error)
    }
	)
}

module.exports = {
  toJSON,
}