[HTML5] Libraries refactor for linting.

Initial work to make liniting easier.

This includes:
- Rename http_request.js to library_godot_http_request.js.
- Rename externs.js to engine.externs.js.
- New library_godot_runtime.js (GodotRuntime) wraps around emscripten
  functions.
- Refactor of XMLHttpRequest handler in engine/preloader.js.
- Few fixes to bugs spotted by early stage linting.

1 files changed, 0 insertions, 135 deletions

diff --git a/platform/javascript/engine/preloader.js b/platform/javascript/engine/preloader.js
deleted file mode 100644
index b3467d009f..0000000000
--- a/platform/javascript/engine/preloader.js
+++ /dev/null
@@ -1,135 +0,0 @@
-var Preloader = /** @constructor */ function() {
-	var DOWNLOAD_ATTEMPTS_MAX = 4;
-	var progressFunc = null;
-	var lastProgress = { loaded: 0, total: 0 };
-
-	var loadingFiles = {};
-	this.preloadedFiles = [];
-
-	function loadXHR(resolve, reject, file, tracker) {
-		var xhr = new XMLHttpRequest;
-		xhr.open('GET', file);
-		if (!file.endsWith('.js')) {
-			xhr.responseType = 'arraybuffer';
-		}
-		['loadstart', 'progress', 'load', 'error', 'abort'].forEach(function(ev) {
-			xhr.addEventListener(ev, onXHREvent.bind(xhr, resolve, reject, file, tracker));
-		});
-		xhr.send();
-	}
-
-	function onXHREvent(resolve, reject, file, tracker, ev) {
-		if (this.status >= 400) {
-			if (this.status < 500 || ++tracker[file].attempts >= DOWNLOAD_ATTEMPTS_MAX) {
-				reject(new Error("Failed loading file '" + file + "': " + this.statusText));
-				this.abort();
-				return;
-			} else {
-				setTimeout(loadXHR.bind(null, resolve, reject, file, tracker), 1000);
-			}
-		}
-
-		switch (ev.type) {
-			case 'loadstart':
-				if (tracker[file] === undefined) {
-					tracker[file] = {
-						total: ev.total,
-						loaded: ev.loaded,
-						attempts: 0,
-						final: false,
-					};
-				}
-				break;
-
-			case 'progress':
-				tracker[file].loaded = ev.loaded;
-				tracker[file].total = ev.total;
-				break;
-
-			case 'load':
-				tracker[file].final = true;
-				resolve(this);
-				break;
-
-			case 'error':
-				if (++tracker[file].attempts >= DOWNLOAD_ATTEMPTS_MAX) {
-					tracker[file].final = true;
-					reject(new Error("Failed loading file '" + file + "'"));
-				} else {
-					setTimeout(loadXHR.bind(null, resolve, reject, file, tracker), 1000);
-				}
-				break;
-
-			case 'abort':
-				tracker[file].final = true;
-				reject(new Error("Loading file '" + file + "' was aborted."));
-				break;
-		}
-	}
-
-	this.loadPromise = function(file) {
-		return new Promise(function(resolve, reject) {
-			loadXHR(resolve, reject, file, loadingFiles);
-		});
-	}
-
-	this.preload = function(pathOrBuffer, destPath) {
-		if (pathOrBuffer instanceof ArrayBuffer) {
-			pathOrBuffer = new Uint8Array(pathOrBuffer);
-		} else if (ArrayBuffer.isView(pathOrBuffer)) {
-			pathOrBuffer = new Uint8Array(pathOrBuffer.buffer);
-		}
-		if (pathOrBuffer instanceof Uint8Array) {
-			this.preloadedFiles.push({
-				path: destPath,
-				buffer: pathOrBuffer
-			});
-			return Promise.resolve();
-		} else if (typeof pathOrBuffer === 'string') {
-			var me = this;
-			return this.loadPromise(pathOrBuffer).then(function(xhr) {
-				me.preloadedFiles.push({
-					path: destPath || pathOrBuffer,
-					buffer: xhr.response
-				});
-				return Promise.resolve();
-			});
-		} else {
-			throw Promise.reject("Invalid object for preloading");
-		}
-	};
-
-	var animateProgress = function() {
-		var loaded = 0;
-		var total = 0;
-		var totalIsValid = true;
-		var progressIsFinal = true;
-
-		Object.keys(loadingFiles).forEach(function(file) {
-			const stat = loadingFiles[file];
-			if (!stat.final) {
-				progressIsFinal = false;
-			}
-			if (!totalIsValid || stat.total === 0) {
-				totalIsValid = false;
-				total = 0;
-			} else {
-				total += stat.total;
-			}
-			loaded += stat.loaded;
-		});
-		if (loaded !== lastProgress.loaded || total !== lastProgress.total) {
-			lastProgress.loaded = loaded;
-			lastProgress.total = total;
-			if (typeof progressFunc === 'function')
-				progressFunc(loaded, total);
-		}
-		if (!progressIsFinal)
-			requestAnimationFrame(animateProgress);
-	}
-	this.animateProgress = animateProgress; // Also exposed to start it.
-
-	this.setProgressFunc = function(callback) {
-		progressFunc = callback;
-	}
-};