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hypersplash.js
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(function(){
"use strict";
// hyperslash - Simple module loader and splash screen
//
// Copyright 2017 BitCtrl Systems GmbH <https://www.bitctrl.de>
// Copyright 2017 Daniel Hammerschmidt <[email protected]>
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in
// the documentation and/or other materials provided with the
// distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
// WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
// TODO: add counter for loaded and remaining components to detect disruption
// in module dependencies
function nextTick( fn ) {
setTimeout( fn, 0 );
}
var splashScript = [].slice.call( document.getElementsByTagName( 'script' ) ).pop();
var toLoadMap = {};
var componentsCount = 0;
var componentsLoadedCount = 0;
var modulesCount = 0;
var modulesInQueueCount = 0;
var failed = false;
var cssClassName = splashScript.dataset.cssClassName;
var errorEventName = splashScript.dataset.errorEventName;
var progressEventName = splashScript.dataset.progressEventName;
var debugMode = false;
// callback to modify URLs
var urlReplacer = splashScript.dataset.urlReplacer;
if ( urlReplacer ) {
urlReplacer = Function( 'DEBUG', 'url', 'module', 'type', urlReplacer );
} else {
urlReplacer = function( DEBUG, url ) { return url; };
}
// add the css class name to <head> immediately (before initial rendering)
cssClassName && document.documentElement.classList.add( cssClassName );
addEventListener( 'load', function(){
// add the css class name to <body> after loading (after initial rendering)
cssClassName && document.body.classList.add( cssClassName );
var modulesConfUrl = splashScript.dataset.modulesDef;
if ( splashScript.dataset.debugRegexp && splashScript.dataset.debugModulesDef ) {
if ( new RegExp( splashScript.dataset.debugRegexp ).test( location.toString() ) ) {
debugMode = true;
modulesConfUrl = splashScript.dataset.debugModulesDef;
}
}
loadModulesConf( modulesConfUrl );
});
function loadModulesConf( modulesConfUrl ) {
// TODO: handle error
var req = new XMLHttpRequest();
req.open( 'GET', urlReplacer( debugMode, modulesConfUrl ), true );
req.overrideMimeType( 'application/json' );
req.onreadystatechange = function () {
if ( this.readyState != 4 ) {
return;
}
var modulesDef = JSON.parse( this.responseText );
nextTick( parseModulesConf.bind( null, modulesDef ) );
};
req.send();
}
function parseModulesConf( modulesConf ) {
// build initial map with 'wants'-references
for ( var moduleName in modulesConf ) {
var moduleConf = modulesConf[ moduleName ];
if ( moduleConf[ 0 ] instanceof Array ) {
var wants = moduleConf[ 0 ];
var components = moduleConf[ 1 ];
} else {
var wants = [];
var components = moduleConf[ 0 ];
}
toLoadMap[ moduleName ] = {
name: moduleName,
components: components,
wants: wants,
wantedBy: {}
};
}
// make reverse 'wanted-by'-references
for ( var moduleName in toLoadMap ) {
var module = toLoadMap[ moduleName ];
++modulesCount;
for ( var componentType in module.components ) {
var componentsByType = module.components[ componentType ];
if ( typeof componentsByType === 'string' ) {
module.components[ componentType ] = componentsByType = [ componentsByType ];
} else if ( componentsByType.length === 0 ) {
delete module.components[ componentType ];
continue;
}
componentsCount += componentsByType.length;
}
if ( module.wants.length === 0 ) {
++modulesInQueueCount;
nextTick( loadModule.bind( null, moduleName ) );
} else for ( var ii = module.wants.length; ii; ) {
var prerequisiteName = module.wants[ --ii ];
if ( toLoadMap.hasOwnProperty( prerequisiteName ) ) {
toLoadMap[ prerequisiteName ].wantedBy[ moduleName ] = true;
} else {
dispatchError({ message: `Unresolved dependency ${prerequisiteName} for module ${moduleName}.` });
}
}
}
if ( !modulesInQueueCount ) {
dispatchError({ message: `No module w/o dependencies found.` });
}
}
function dispatchError( detail ) {
failed = true;
errorEventName && window.dispatchEvent( new CustomEvent( errorEventName, { detail: detail }));
}
function loadModule( moduleName ) {
if ( failed ) return;
var module = toLoadMap[ moduleName ];
for ( var componentType in module.components ) {
var componentsByType = module.components[ componentType ];
componentsByType.forEach( function( componentSource ){
nextTick( loadComponent.bind( null, moduleName, componentType, componentSource ) );
});
}
}
function loadComponent( moduleName, componentType, componentSource ) {
if ( failed ) return;
var module = toLoadMap[ moduleName ];
componentSource = urlReplacer( debugMode, componentSource, moduleName, componentType );
function onComplete() {
cssClassName && nextTick( function() {
document.documentElement.classList.remove( cssClassName );
document.body.classList.remove( cssClassName );
});
progressEventName && window.dispatchEvent( new CustomEvent( progressEventName, { detail: {
type: 'complete',
}}));
}
function onModuleLoaded() {
delete module.components[ componentType ];
if ( Object.getOwnPropertyNames( module.components ).length === 0 ) {
for ( var dependentName in toLoadMap[ moduleName ].wantedBy ) {
var dependent = toLoadMap[ dependentName ];
dependent.wants.splice( dependent.wants.indexOf( moduleName ), 1 );
if ( dependent.wants.length === 0 ) {
++modulesInQueueCount;
nextTick( loadModule.bind( null, dependentName ) );
}
}
delete toLoadMap[ moduleName ];
var modulesToLoadCount = Object.getOwnPropertyNames( toLoadMap ).length;
if ( 0 === --modulesInQueueCount && 0 !== modulesToLoadCount ) {
dispatchError({ message: 'Circular reference in dependencies.' });
} else if ( 0 === modulesToLoadCount ) {
nextTick( onComplete );
}
progressEventName && window.dispatchEvent( new CustomEvent( progressEventName, { detail: {
type: 'module',
moduleName: moduleName
}}));
}
}
function onComponentLoaded( event ) {
var rate = 1.0 * ++componentsLoadedCount / componentsCount;
module.components[ componentType ].splice( module.components[ componentType ].indexOf( componentSource ), 1 );
if ( module.components[ componentType ].length === 0 ) {
nextTick( onModuleLoaded );
}
progressEventName && window.dispatchEvent( new CustomEvent( progressEventName, { detail: {
type: 'component',
rate: rate,
moduleName: moduleName,
componentType: componentType,
componentSource: componentSource,
event: event
}}));
}
function onError( event ) {
dispatchError({
message: `Cannot load component "${componentSource}" of module "${moduleName}"`,
moduleName: moduleName,
componentType: componentType,
componentSource: componentSource,
event: event
});
}
switch( componentType ) {
case 'js':
var script = document.head.appendChild( document.createElement( 'script' ) );
script.src = componentSource;
script.addEventListener( 'load', onComponentLoaded );
script.addEventListener( 'error', onError );
break;
case 'css':
var link = document.head.appendChild( document.createElement( 'link' ) );
link.type = 'text/css';
link.rel = 'stylesheet';
link.href = componentSource;
link.addEventListener( 'load', function( event ) {
// handle error in ie and edge
try {
event.target.sheet.cssText;
onComponentLoaded.call( link, event );
} catch ( e ) {
onError.call( link, event );
}
});
link.addEventListener( 'error', onError );
break;
default:
}
}
})();