refactor(runner): rename preprocessing to runner and update directory structure

libs/assets_processor.js

@@ -0,0 +1,44 @@
+import path from 'path'
+import { copy, read, write } from './file.js'
+import AlphaComposite from './alpha_composite.js'
+
+export default class AssetsProcessor {
+    #config
+    #operatorName
+    #operatorSourceFolder
+    #alphaCompositer
+    
+    constructor(config, operatorName, rootDir) {
+        this.#config = config
+        this.#operatorName = operatorName
+        this.#operatorSourceFolder = path.join(rootDir, this.#config.folder.operator)
+        this.#alphaCompositer = new AlphaComposite(config, operatorName, rootDir)
+    }
+    
+    async process(publicAssetsDir, extractedDir) {
+        const BASE64_BINARY_PREFIX = 'data:application/octet-stream;base64,'
+        const BASE64_PNG_PREFIX = 'data:image/png;base64,'   
+        const assetsJson = {}
+        const skelFilename = `${this.#config.operators[this.#operatorName].filename}.skel`
+        const skel = await read(path.join(extractedDir, skelFilename), null)
+        const atlasFilename = `${this.#config.operators[this.#operatorName].filename}.atlas`
+        const atlas = await read(path.join(extractedDir, atlasFilename))
+        const dimensions = atlas.match(new RegExp(/^size:(.*),(.*)/gm))[0].replace('size: ', '').split(',')
+        const matches = atlas.match(new RegExp(/(.*).png/g))
+        for (const item of matches) {
+            const buffer = await this.#alphaCompositer.process(item, extractedDir)
+            assetsJson[`./assets/${item}`] = BASE64_PNG_PREFIX + buffer.toString('base64')
+        }
+        assetsJson[`./assets/${skelFilename.replace('#', '%23')}`] = BASE64_BINARY_PREFIX + skel.toString('base64')
+        assetsJson[`./assets/${atlasFilename.replace('#', '%23')}`] = BASE64_BINARY_PREFIX + Buffer.from(atlas).toString('base64')
+
+        const fallbackFilename = `${this.#config.operators[this.#operatorName].fallback_name}.png`
+        const fallbackBuffer = await this.#alphaCompositer.process(fallbackFilename, extractedDir)
+        await write(fallbackBuffer, path.join(this.#operatorSourceFolder, this.#operatorName, fallbackFilename))
+        await copy(path.join(this.#operatorSourceFolder, this.#operatorName, fallbackFilename), path.join(publicAssetsDir, fallbackFilename))
+        return {
+            dimensions,
+            assetsJson
+        }
+    }
+}