Parse Aseprite File for Unity

aseprite-parser.js

const Aseprite = require("ase-parser");
const fs = require("fs");

const buff = fs.readFileSync(
  "../../Assets/Resources/Textures/Character/Character.ase"
);

const template = `%YAML 1.1
%TAG !u! tag:unity3d.com,2011:
--- !u!114 &11400000
MonoBehaviour:
  m_ObjectHideFlags: 0
  m_CorrespondingSourceObject: {fileID: 0}
  m_PrefabInstance: {fileID: 0}
  m_PrefabAsset: {fileID: 0}
  m_GameObject: {fileID: 0}
  m_Enabled: 1
  m_EditorHideFlags: 0
  m_Script: {fileID: 11500000, guid: 5d4c0c1394c3b84468e2f971a8c5bcdc, type: 3}
  m_Name: <file_name>
  m_EditorClassIdentifier: 
  animationName: <anim_name>
  keyFrameTimes:
<anim_times>
  keyFrameSpriteIndexes: <anim_frames>
  timeStepping: 0.1
  totalLength: <anim_length>
  loopable: 1
`;

const aseFile = new Aseprite(buff, "somefile.aseprite");
aseFile.parse();

for (let i = 0; i < aseFile.tags.length; i++) {
  const tag = aseFile.tags[i];
  let frameString = "";
  let frameTimeString = "";
  let frameTime = 0.0;
  for (let j = tag.from; j <= tag.to; j++) {
    frameString += j.toString(16).padStart(2, "0");
    let duration = aseFile.frames[j].frameDuration / 1000;
    frameTime = parseFloat(frameTime.toFixed(2));
    frameTimeString += "  - " + frameTime + "\n";
    frameTime += duration;
  }

  storeAnimation(tag.name, frameTimeString, frameString, frameTime);
}

function storeAnimation(anim_name, anim_times, anim_frames, anim_length) {
  const file_name = "NBAnim_Player_" + anim_name;
  anim_times = anim_times.trimEnd();
  const replacedTemplate = template
    .replace("<file_name>", file_name)
    .replace("<anim_name>", anim_name)
    .replace("<anim_times>", anim_times)
    .replace("<anim_frames>", anim_frames)
    .replace("<anim_length>", anim_length);

  console.log("Creating " + file_name);
  fs.writeFileSync("generated/" + file_name + ".asset", replacedTemplate);
}