261 lines
8.5 KiB
JavaScript
261 lines
8.5 KiB
JavaScript
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/*
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SystemJS Loader Plugin Support
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Supports plugin loader syntax with "!", or via metadata.loader
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The plugin name is loaded as a module itself, and can override standard loader hooks
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for the plugin resource. See the plugin section of the systemjs readme.
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*/
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(function() {
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function getParentName(loader, parentName) {
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// if parent is a plugin, normalize against the parent plugin argument only
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if (parentName) {
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var parentPluginIndex;
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if (loader.pluginFirst) {
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if ((parentPluginIndex = parentName.lastIndexOf('!')) != -1)
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return parentName.substr(parentPluginIndex + 1);
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}
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else {
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if ((parentPluginIndex = parentName.indexOf('!')) != -1)
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return parentName.substr(0, parentPluginIndex);
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}
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return parentName;
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}
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}
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function parsePlugin(loader, name) {
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var argumentName;
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var pluginName;
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var pluginIndex = name.lastIndexOf('!');
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if (pluginIndex == -1)
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return;
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if (loader.pluginFirst) {
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argumentName = name.substr(pluginIndex + 1);
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pluginName = name.substr(0, pluginIndex);
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}
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else {
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argumentName = name.substr(0, pluginIndex);
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pluginName = name.substr(pluginIndex + 1) || argumentName.substr(argumentName.lastIndexOf('.') + 1);
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}
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return {
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argument: argumentName,
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plugin: pluginName
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};
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}
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// put name back together after parts have been normalized
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function combinePluginParts(loader, argumentName, pluginName, defaultExtension) {
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if (defaultExtension && argumentName.substr(argumentName.length - 3, 3) == '.js')
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argumentName = argumentName.substr(0, argumentName.length - 3);
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if (loader.pluginFirst) {
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return pluginName + '!' + argumentName;
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}
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else {
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return argumentName + '!' + pluginName;
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}
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}
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// note if normalize will add a default js extension
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// if so, remove for backwards compat
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// this is strange and sucks, but will be deprecated
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function checkDefaultExtension(loader, arg) {
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return loader.defaultJSExtensions && arg.substr(arg.length - 3, 3) != '.js';
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}
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function createNormalizeSync(normalizeSync) {
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return function(name, parentName, isPlugin) {
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var loader = this;
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parentName = getParentName(this, parentName);
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var parsed = parsePlugin(loader, name);
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if (!parsed)
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return normalizeSync.call(this, name, parentName, isPlugin);
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// if this is a plugin, normalize the plugin name and the argument
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var argumentName = loader.normalizeSync(parsed.argument, parentName, true);
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var pluginName = loader.normalizeSync(parsed.plugin, parentName, true);
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return combinePluginParts(loader, argumentName, pluginName, checkDefaultExtension(loader, parsed.argument));
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};
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}
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hook('decanonicalize', createNormalizeSync);
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hook('normalizeSync', createNormalizeSync);
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hook('normalize', function(normalize) {
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return function(name, parentName, isPlugin) {
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var loader = this;
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parentName = getParentName(this, parentName);
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var parsed = parsePlugin(loader, name);
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if (!parsed)
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return normalize.call(loader, name, parentName, isPlugin);
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return Promise.all([
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loader.normalize(parsed.argument, parentName, true),
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loader.normalize(parsed.plugin, parentName)
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])
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.then(function(normalized) {
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return combinePluginParts(loader, normalized[0], normalized[1], checkDefaultExtension(loader, parsed.argument));
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});
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}
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});
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hook('locate', function(locate) {
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return function(load) {
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var loader = this;
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var name = load.name;
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// plugin syntax
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var pluginSyntaxIndex;
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if (loader.pluginFirst) {
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if ((pluginSyntaxIndex = name.indexOf('!')) != -1) {
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load.metadata.loader = name.substr(0, pluginSyntaxIndex);
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load.name = name.substr(pluginSyntaxIndex + 1);
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}
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}
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else {
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if ((pluginSyntaxIndex = name.lastIndexOf('!')) != -1) {
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load.metadata.loader = name.substr(pluginSyntaxIndex + 1);
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load.name = name.substr(0, pluginSyntaxIndex);
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}
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}
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return locate.call(loader, load)
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.then(function(address) {
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if (pluginSyntaxIndex != -1 || !load.metadata.loader)
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return address;
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// normalize plugin relative to parent in locate here when
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// using plugin via loader metadata
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return loader.normalize(load.metadata.loader, load.name)
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.then(function(loaderNormalized) {
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load.metadata.loader = loaderNormalized;
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return address;
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});
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})
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.then(function(address) {
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var plugin = load.metadata.loader;
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if (!plugin)
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return address;
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// don't allow a plugin to load itself
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if (load.name == plugin)
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throw new Error('Plugin ' + plugin + ' cannot load itself, make sure it is excluded from any wildcard meta configuration via a custom loader: false rule.');
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// only fetch the plugin itself if this name isn't defined
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if (loader.defined && loader.defined[name])
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return address;
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var pluginLoader = loader.pluginLoader || loader;
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// load the plugin module and run standard locate
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return pluginLoader['import'](plugin)
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.then(function(loaderModule) {
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// store the plugin module itself on the metadata
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load.metadata.loaderModule = loaderModule;
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load.address = address;
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if (loaderModule.locate)
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return loaderModule.locate.call(loader, load);
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return address;
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});
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});
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};
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});
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hook('fetch', function(fetch) {
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return function(load) {
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var loader = this;
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if (load.metadata.loaderModule && load.metadata.loaderModule.fetch && load.metadata.format != 'defined') {
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load.metadata.scriptLoad = false;
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return load.metadata.loaderModule.fetch.call(loader, load, function(load) {
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return fetch.call(loader, load);
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});
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}
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else {
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return fetch.call(loader, load);
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}
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};
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});
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hook('translate', function(translate) {
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return function(load) {
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var loader = this;
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if (load.metadata.loaderModule && load.metadata.loaderModule.translate && load.metadata.format != 'defined') {
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return Promise.resolve(load.metadata.loaderModule.translate.call(loader, load)).then(function(result) {
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var sourceMap = load.metadata.sourceMap;
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// sanitize sourceMap if an object not a JSON string
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if (sourceMap) {
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if (typeof sourceMap != 'object')
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throw new Error('load.metadata.sourceMap must be set to an object.');
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var originalName = load.name.split('!')[0];
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// force set the filename of the original file
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sourceMap.file = originalName + '!transpiled';
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// force set the sources list if only one source
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if (!sourceMap.sources || sourceMap.sources.length <= 1)
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sourceMap.sources = [originalName];
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}
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// if running on file:/// URLs, sourcesContent is necessary
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// load.metadata.sourceMap.sourcesContent = [load.source];
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if (typeof result == 'string')
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load.source = result;
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else
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warn.call(this, 'Plugin ' + load.metadata.loader + ' should return the source in translate, instead of setting load.source directly. This support will be deprecated.');
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return translate.call(loader, load);
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});
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}
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else {
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return translate.call(loader, load);
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}
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};
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});
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hook('instantiate', function(instantiate) {
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return function(load) {
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var loader = this;
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var calledInstantiate = false;
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if (load.metadata.loaderModule && load.metadata.loaderModule.instantiate && !loader.builder && load.metadata.format != 'defined')
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return Promise.resolve(load.metadata.loaderModule.instantiate.call(loader, load, function(load) {
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if (calledInstantiate)
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throw new Error('Instantiate must only be called once.');
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calledInstantiate = true;
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return instantiate.call(loader, load);
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})).then(function(result) {
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if (calledInstantiate)
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return result;
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load.metadata.entry = createEntry();
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load.metadata.entry.execute = function() {
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return result;
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}
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load.metadata.entry.deps = load.metadata.deps;
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load.metadata.format = 'defined';
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return instantiate.call(loader, load);
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});
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else
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return instantiate.call(loader, load);
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};
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});
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})();
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