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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,173 +1,194 @@ | ||
| /* | ||
| * Copyright (c) 2014 The Polymer Project Authors. All rights reserved. | ||
| * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt | ||
| * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt | ||
| * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt | ||
| * Code distributed by Google as part of the polymer project is also | ||
| * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt | ||
| */(function(scope) { | ||
|
|
||
| var hasNative = ('import' in document.createElement('link')); | ||
| var useNative = hasNative; | ||
|
|
||
| isIE = /Trident/.test(navigator.userAgent); | ||
|
|
||
| // TODO(sorvell): SD polyfill intrusion | ||
| var hasShadowDOMPolyfill = Boolean(window.ShadowDOMPolyfill); | ||
| var wrap = function(node) { | ||
| return hasShadowDOMPolyfill ? ShadowDOMPolyfill.wrapIfNeeded(node) : node; | ||
| }; | ||
| var mainDoc = wrap(document); | ||
|
|
||
| // NOTE: We cannot polyfill document.currentScript because it's not possible | ||
| // both to override and maintain the ability to capture the native value; | ||
| // therefore we choose to expose _currentScript both when native imports | ||
| // and the polyfill are in use. | ||
| var currentScriptDescriptor = { | ||
| get: function() { | ||
| var script = HTMLImports.currentScript || document.currentScript || | ||
| // NOTE: only works when called in synchronously executing code. | ||
| // readyState should check if `loading` but IE10 is | ||
| // interactive when scripts run so we cheat. | ||
| (document.readyState !== 'complete' ? | ||
| document.scripts[document.scripts.length - 1] : null); | ||
| return wrap(script); | ||
| }, | ||
| configurable: true | ||
| }; | ||
|
|
||
| Object.defineProperty(document, '_currentScript', currentScriptDescriptor); | ||
| Object.defineProperty(mainDoc, '_currentScript', currentScriptDescriptor); | ||
|
|
||
| // call a callback when all HTMLImports in the document at call (or at least | ||
| // document ready) time have loaded. | ||
| // 1. ensure the document is in a ready state (has dom), then | ||
| // 2. watch for loading of imports and call callback when done | ||
| function whenImportsReady(callback, doc) { | ||
| doc = doc || mainDoc; | ||
| // if document is loading, wait and try again | ||
| whenDocumentReady(function() { | ||
| watchImportsLoad(callback, doc); | ||
| }, doc); | ||
| } | ||
|
|
||
| // call the callback when the document is in a ready state (has dom) | ||
| var requiredReadyState = isIE ? 'complete' : 'interactive'; | ||
| var READY_EVENT = 'readystatechange'; | ||
| function isDocumentReady(doc) { | ||
| return (doc.readyState === 'complete' || | ||
| doc.readyState === requiredReadyState); | ||
| } | ||
|
|
||
| // call <callback> when we ensure the document is in a ready state | ||
| function whenDocumentReady(callback, doc) { | ||
| if (!isDocumentReady(doc)) { | ||
| var checkReady = function() { | ||
| if (doc.readyState === 'complete' || | ||
| doc.readyState === requiredReadyState) { | ||
| doc.removeEventListener(READY_EVENT, checkReady); | ||
| whenDocumentReady(callback, doc); | ||
| } | ||
| }; | ||
| doc.addEventListener(READY_EVENT, checkReady); | ||
| } else if (callback) { | ||
| callback(); | ||
| } | ||
| } | ||
|
|
||
| function markTargetLoaded(event) { | ||
| event.target.__loaded = true; | ||
| } | ||
|
|
||
| // call <callback> when we ensure all imports have loaded | ||
| function watchImportsLoad(callback, doc) { | ||
| var imports = doc.querySelectorAll('link[rel=import]'); | ||
| var loaded = 0, l = imports.length; | ||
| function checkDone(d) { | ||
| if (loaded == l) { | ||
| callback && callback(); | ||
| } | ||
| } | ||
| function loadedImport(e) { | ||
| markTargetLoaded(e); | ||
| loaded++; | ||
| checkDone(); | ||
| } | ||
| if (l) { | ||
| for (var i=0, imp; (i<l) && (imp=imports[i]); i++) { | ||
| if (isImportLoaded(imp)) { | ||
| loadedImport.call(imp, {target: imp}); | ||
| } else { | ||
| imp.addEventListener('load', loadedImport); | ||
| imp.addEventListener('error', loadedImport); | ||
| } | ||
| } | ||
| } else { | ||
| checkDone(); | ||
| } | ||
| } | ||
|
|
||
| // NOTE: test for native imports loading is based on explicitly watching | ||
| // all imports (see below). | ||
| function isImportLoaded(link) { | ||
| return useNative ? link.__loaded : link.__importParsed; | ||
| } | ||
|
|
||
| // TODO(sorvell): install a mutation observer to see if HTMLImports have loaded | ||
| // this is a workaround for https://www.w3.org/Bugs/Public/show_bug.cgi?id=25007 | ||
| // and should be removed when this bug is addressed. | ||
| if (useNative) { | ||
| new MutationObserver(function(mxns) { | ||
| for (var i=0, l=mxns.length, m; (i < l) && (m=mxns[i]); i++) { | ||
| if (m.addedNodes) { | ||
| handleImports(m.addedNodes); | ||
| } | ||
| } | ||
| }).observe(document.head, {childList: true}); | ||
|
|
||
| function handleImports(nodes) { | ||
| for (var i=0, l=nodes.length, n; (i<l) && (n=nodes[i]); i++) { | ||
| if (isImport(n)) { | ||
| handleImport(n); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| function isImport(element) { | ||
| return element.localName === 'link' && element.rel === 'import'; | ||
| } | ||
|
|
||
| function handleImport(element) { | ||
| var loaded = element.import; | ||
| if (loaded) { | ||
| markTargetLoaded({target: element}); | ||
| } else { | ||
| element.addEventListener('load', markTargetLoaded); | ||
| element.addEventListener('error', markTargetLoaded); | ||
| } | ||
| } | ||
|
|
||
| } | ||
|
|
||
| // Fire the 'HTMLImportsLoaded' event when imports in document at load time | ||
| // have loaded. This event is required to simulate the script blocking | ||
| // behavior of native imports. A main document script that needs to be sure | ||
| // imports have loaded should wait for this event. | ||
| whenImportsReady(function() { | ||
| HTMLImports.ready = true; | ||
| HTMLImports.readyTime = new Date().getTime(); | ||
| mainDoc.dispatchEvent( | ||
| new CustomEvent('HTMLImportsLoaded', {bubbles: true}) | ||
| ); | ||
| }); | ||
|
|
||
| // exports | ||
| scope.useNative = useNative; | ||
| scope.isImportLoaded = isImportLoaded; | ||
| scope.whenReady = whenImportsReady; | ||
| scope.isIE = isIE; | ||
|
|
||
| // deprecated | ||
| scope.whenImportsReady = whenImportsReady; | ||
|
|
||
| })(window.HTMLImports); | ||
| /* | ||
| * Copyright (c) 2014 The Polymer Project Authors. All rights reserved. | ||
| * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt | ||
| * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt | ||
| * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt | ||
| * Code distributed by Google as part of the polymer project is also | ||
| * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt | ||
| */ | ||
|
|
||
| (function(scope) { | ||
|
|
||
| var hasNative = ('import' in document.createElement('link')); | ||
| var useNative = hasNative; | ||
|
|
||
| isIE = /Trident/.test(navigator.userAgent); | ||
|
|
||
| // TODO(sorvell): SD polyfill intrusion | ||
| var hasShadowDOMPolyfill = Boolean(window.ShadowDOMPolyfill); | ||
| var wrap = function(node) { | ||
| return hasShadowDOMPolyfill ? ShadowDOMPolyfill.wrapIfNeeded(node) : node; | ||
| }; | ||
| var mainDoc = wrap(document); | ||
|
|
||
| // NOTE: We cannot polyfill document.currentScript because it's not possible | ||
| // both to override and maintain the ability to capture the native value; | ||
| // therefore we choose to expose _currentScript both when native imports | ||
| // and the polyfill are in use. | ||
| var currentScriptDescriptor = { | ||
| get: function() { | ||
| var script = HTMLImports.currentScript || document.currentScript || | ||
| // NOTE: only works when called in synchronously executing code. | ||
| // readyState should check if `loading` but IE10 is | ||
| // interactive when scripts run so we cheat. | ||
| (document.readyState !== 'complete' ? | ||
| document.scripts[document.scripts.length - 1] : null); | ||
| return wrap(script); | ||
| }, | ||
| configurable: true | ||
| }; | ||
|
|
||
| Object.defineProperty(document, '_currentScript', currentScriptDescriptor); | ||
| Object.defineProperty(mainDoc, '_currentScript', currentScriptDescriptor); | ||
|
|
||
| // call a callback when all HTMLImports in the document at call (or at least | ||
| // document ready) time have loaded. | ||
| // 1. ensure the document is in a ready state (has dom), then | ||
| // 2. watch for loading of imports and call callback when done | ||
| function whenImportsReady(callback, doc) { | ||
| doc = doc || mainDoc; | ||
| // if document is loading, wait and try again | ||
| whenDocumentReady(function() { | ||
| watchImportsLoad(callback, doc); | ||
| }, doc); | ||
| } | ||
|
|
||
| // call the callback when the document is in a ready state (has dom) | ||
| var requiredReadyState = isIE ? 'complete' : 'interactive'; | ||
| var READY_EVENT = 'readystatechange'; | ||
| function isDocumentReady(doc) { | ||
| return (doc.readyState === 'complete' || | ||
| doc.readyState === requiredReadyState); | ||
| } | ||
|
|
||
| // call <callback> when we ensure the document is in a ready state | ||
| function whenDocumentReady(callback, doc) { | ||
| if (!isDocumentReady(doc)) { | ||
| var checkReady = function() { | ||
| if (doc.readyState === 'complete' || | ||
| doc.readyState === requiredReadyState) { | ||
| doc.removeEventListener(READY_EVENT, checkReady); | ||
| whenDocumentReady(callback, doc); | ||
| } | ||
| }; | ||
| doc.addEventListener(READY_EVENT, checkReady); | ||
| } else if (callback) { | ||
| callback(); | ||
| } | ||
| } | ||
|
|
||
| function markTargetLoaded(event) { | ||
| event.target.__loaded = true; | ||
| } | ||
|
|
||
| // call <callback> when we ensure all imports have loaded | ||
| function watchImportsLoad(callback, doc) { | ||
| var imports = doc.querySelectorAll('link[rel=import]'); | ||
| var loaded = 0, l = imports.length; | ||
| function checkDone(d) { | ||
| if (loaded == l) { | ||
| callback && callback(); | ||
| } | ||
| } | ||
| function loadedImport(e) { | ||
| markTargetLoaded(e); | ||
| loaded++; | ||
| checkDone(); | ||
| } | ||
| if (l) { | ||
| for (var i=0, imp; (i<l) && (imp=imports[i]); i++) { | ||
| if (isImportLoaded(imp)) { | ||
| loadedImport.call(imp, {target: imp}); | ||
| } else { | ||
| imp.addEventListener('load', loadedImport); | ||
| imp.addEventListener('error', loadedImport); | ||
| } | ||
| } | ||
| } else { | ||
| checkDone(); | ||
| } | ||
| } | ||
|
|
||
| // NOTE: test for native imports loading is based on explicitly watching | ||
| // all imports (see below). | ||
| function isImportLoaded(link) { | ||
| return useNative ? link.__loaded : link.__importParsed; | ||
| } | ||
|
|
||
| // TODO(sorvell): Workaround for | ||
| // https://www.w3.org/Bugs/Public/show_bug.cgi?id=25007, should be removed when | ||
| // this bug is addressed. | ||
| // (1) Install a mutation observer to see when HTMLImports have loaded | ||
| // (2) if this script is run during document load it will watch any existing | ||
| // imports for loading. | ||
| // | ||
| // NOTE: The workaround has restricted functionality: (1) it's only compatible | ||
| // with imports that are added to document.head since the mutation observer | ||
| // watches only head for perf reasons, (2) it requires this script | ||
| // to run before any imports have completed loading. | ||
| if (useNative) { | ||
| new MutationObserver(function(mxns) { | ||
| for (var i=0, l=mxns.length, m; (i < l) && (m=mxns[i]); i++) { | ||
| if (m.addedNodes) { | ||
| handleImports(m.addedNodes); | ||
| } | ||
| } | ||
| }).observe(document.head, {childList: true}); | ||
|
|
||
| function handleImports(nodes) { | ||
| for (var i=0, l=nodes.length, n; (i<l) && (n=nodes[i]); i++) { | ||
| if (isImport(n)) { | ||
| handleImport(n); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| function isImport(element) { | ||
| return element.localName === 'link' && element.rel === 'import'; | ||
| } | ||
|
|
||
| function handleImport(element) { | ||
| var loaded = element.import; | ||
| if (loaded) { | ||
| markTargetLoaded({target: element}); | ||
| } else { | ||
| element.addEventListener('load', markTargetLoaded); | ||
| element.addEventListener('error', markTargetLoaded); | ||
| } | ||
| } | ||
|
|
||
| // make sure to catch any imports that are in the process of loading | ||
| // when this script is run. | ||
| (function() { | ||
| if (document.readyState === 'loading') { | ||
| var imports = document.querySelectorAll('link[rel=import]'); | ||
| for (var i=0, l=imports.length, imp; (i<l) && (imp=imports[i]); i++) { | ||
| handleImport(imp); | ||
| } | ||
| } | ||
| })(); | ||
|
|
||
| } | ||
|
|
||
| // Fire the 'HTMLImportsLoaded' event when imports in document at load time | ||
| // have loaded. This event is required to simulate the script blocking | ||
| // behavior of native imports. A main document script that needs to be sure | ||
| // imports have loaded should wait for this event. | ||
| whenImportsReady(function() { | ||
| HTMLImports.ready = true; | ||
| HTMLImports.readyTime = new Date().getTime(); | ||
| mainDoc.dispatchEvent( | ||
| new CustomEvent('HTMLImportsLoaded', {bubbles: true}) | ||
| ); | ||
| }); | ||
|
|
||
| // exports | ||
| scope.useNative = useNative; | ||
| scope.isImportLoaded = isImportLoaded; | ||
| scope.whenReady = whenImportsReady; | ||
| scope.isIE = isIE; | ||
|
|
||
| // deprecated | ||
| scope.whenImportsReady = whenImportsReady; | ||
|
|
||
| })(window.HTMLImports); |
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