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index.js
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index.js
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const path = require('path');
const noop = ()=>{};
/**
* Request single file.
* @param src
* @param type
* @param onSuccess
* @param onError
*/
function request(src,type,onSuccess,onError){
const request_ = new XMLHttpRequest();
request_.open('GET',src);
request_.repsonseType = type;
request_.addEventListener('readystatechange',function onChange(){
if(this.readyState === 4){
switch(this.status){
case 200:
onSuccess(this.response);
break;
case 404:
onError();
break;
}
}
});
request_.send();
}
/**
* Load resource.
* @param index
* @param resource
* @param onSuccess
* @param onError
* @param strict
*/
function loadResource(index,resource,onSuccess,onError,strict){
let type = resource.type;
let src = resource.src;
if(!src){
console.log(`Warning: Resource ${type ? `of type '${type}'` : ''} ${index !== null ? `at index ${index}` : ''} has no path.`);
return;
}
src = path.normalize(src);
type = type || 'text';
if(type !== 'text' &&
type !== 'image' &&
type !== 'svg' &&
type !== 'json' &&
type !== 'video' &&
type !== 'arraybuffer'){
console.log(`Warning: Resource '${src}' of type '${type}' ${index !== null ? `at index ${index}` : ''} is not supported.`);
}
function onSuccess_(response){
onSuccess(index,src,response);
}
function onError_(){
console.log(`Warning: Failed to load resource '${src}' of type '${type}' ${index !== null ? `at index ${index}` : ''}.`);
if(strict){
onError(src);
}
}
switch(type){
case 'image':
const image = new Image();
image.addEventListener('load',()=>{
onSuccess_(image);
});
image.addEventListener('error',onError_);
image.src = src;
break;
case 'json':
request(src,type, function(response){
onSuccess_(JSON.parse(response));
},onError_);
break;
case 'svg':
request(src,'text',function(response){
const div = document.createElement('div');
div.innerHTML = response;
onSuccess_(div.children[0]);
});
break;
case 'video':
const video = document.createElement('video');
const source = document.createElement('source');
let videoType = path.extname(src).substring(1);
switch(videoType){
case 'ogm':
case 'ogv':
videoType = 'ogg';
break;
case 'ogg':
case 'mp4':
case 'webm':
break;
default:
throw new Error(`Video type not supported '${videoType}'`);
break;
}
const onVideoSuccess = ()=>{
video.removeEventListener('canplaythrough',onVideoSuccess);
onSuccess_(video);
};
//chrome/firefox
video.addEventListener('canplaythrough', onVideoSuccess);
video.setAttribute('muted','');
video.setAttribute('preload','');
video.setAttribute('loop','');
video.setAttribute('muted','');
source.setAttribute('type',`video/${videoType}`);
source.setAttribute('src',src);
video.appendChild(source);
break;
default:
request(src,type,onSuccess_,onError_);
break;
}
}
/**
* Loads resource bundle.
* @param bundle
* @param cb
* @param [cbProcess]
* @param [strict]
* @example
* loadResources({
* item0 : {type:'text',src:'path/to/item0.txt'},
* item1 : {type:'image',src:'path/to/item1.png'},
* item2 : {type:'video',src:'path/to/item2.mp4'},
* item3 : {type:'json',src:'path/to/item3.json'},
* item4 : {type:'svg',src:'path/to/item4.svg'}
* },(err,res)=>{
* if(err){
* throw err;
* }
* const text = res.item0;
* const image = res.item1;
* const video = res.item2;
* const json = res.item3;
* const svg = res.item4;
* });
*/
module.exports = function loadResources(bundle,cb,cbProcess,strict){
strict = strict === undefined ? true : strict;
cbProcess = cbProcess || noop;
const keys = Object.keys(bundle);
let numFiles = keys.length;
const resources = {};
//no resources, go
if(numFiles === 0){
cb(null,resources);
return;
}
let numFilesLoaded = 0;
let error = false;
function onFileProcessed(index,num,src){
cbProcess({
index : index - 1,
num : num,
src : src
});
if(index === num){
cb(null,resources);
}
}
function onError_(e){
if(!strict){
numFiles--;
onFileProcessed();
return;
}
cb(e,null);
error = true;
}
let index = 0;
for(let resource in bundle){
loadResource(index++,bundle[resource],
function(index,src,resource){
resources[keys[index]] = resource;
numFilesLoaded++;
onFileProcessed(numFilesLoaded,numFiles,src);
},
onError_,
strict
);
if(error){
return;
}
}
}