From 9af485a584e47fd503ed5c62b9f6482574715f1e Mon Sep 17 00:00:00 2001
From: Florian Dold <florian.dold@gmail.com>
Date: Mon, 10 Oct 2016 03:50:11 +0200
Subject: Squashed 'thirdparty/systemjs/' content from commit 5ed69b6

git-subtree-dir: thirdparty/systemjs
git-subtree-split: 5ed69b6344e8fc1cd43bf758350b2236f57e1499
---
 lib/scriptLoader.js | 196 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 196 insertions(+)
 create mode 100644 lib/scriptLoader.js

(limited to 'lib/scriptLoader.js')

diff --git a/lib/scriptLoader.js b/lib/scriptLoader.js
new file mode 100644
index 000000000..8bd1d4b3e
--- /dev/null
+++ b/lib/scriptLoader.js
@@ -0,0 +1,196 @@
+/*
+ * Script tag fetch
+ *
+ * When load.metadata.scriptLoad is true, we load via script tag injection.
+ */
+(function() {
+
+  if (typeof document != 'undefined')
+    var head = document.getElementsByTagName('head')[0];
+
+  var curSystem;
+  var curRequire;
+
+  // if doing worker executing, this is set to the load record being executed
+  var workerLoad = null;
+  
+  // interactive mode handling method courtesy RequireJS
+  var ieEvents = head && (function() {
+    var s = document.createElement('script');
+    var isOpera = typeof opera !== 'undefined' && opera.toString() === '[object Opera]';
+    return s.attachEvent && !(s.attachEvent.toString && s.attachEvent.toString().indexOf('[native code') < 0) && !isOpera;
+  })();
+
+  // IE interactive-only part
+  // we store loading scripts array as { script: <script>, load: {...} }
+  var interactiveLoadingScripts = [];
+  var interactiveScript;
+  function getInteractiveScriptLoad() {
+    if (interactiveScript && interactiveScript.script.readyState === 'interactive')
+      return interactiveScript.load;
+
+    for (var i = 0; i < interactiveLoadingScripts.length; i++)
+      if (interactiveLoadingScripts[i].script.readyState == 'interactive') {
+        interactiveScript = interactiveLoadingScripts[i];
+        return interactiveScript.load;
+      }
+  }
+  
+  // System.register, System.registerDynamic, AMD define pipeline
+  // this is called by the above methods when they execute
+  // we then run the reduceRegister_ collection function either immediately
+  // if we are in IE and know the currently executing script (interactive)
+  // or later if we need to wait for the synchronous load callback to know the script
+  var loadingCnt = 0;
+  var registerQueue = [];
+  hook('pushRegister_', function(pushRegister) {
+    return function(register) {
+      // if using eval-execution then skip
+      if (pushRegister.call(this, register))
+        return false;
+
+      // if using worker execution, then we're done
+      if (workerLoad)
+        this.reduceRegister_(workerLoad, register);
+
+      // detect if we know the currently executing load (IE)
+      // if so, immediately call reduceRegister
+      else if (ieEvents)
+        this.reduceRegister_(getInteractiveScriptLoad(), register);
+
+      // otherwise, add to our execution queue
+      // to call reduceRegister on sync script load event
+      else if (loadingCnt)
+        registerQueue.push(register);
+
+      // if we're not currently loading anything though
+      // then do the reduction against a null load
+      // (out of band named define or named register)
+      // note even in non-script environments, this catch is used
+      else
+        this.reduceRegister_(null, register);
+
+      return true;
+    };
+  });
+
+  function webWorkerImport(loader, load) {
+    return new Promise(function(resolve, reject) {
+      if (load.metadata.integrity)
+        reject(new Error('Subresource integrity checking is not supported in web workers.'));
+
+      workerLoad = load;
+      try {
+        importScripts(load.address);
+      }
+      catch(e) {
+        workerLoad = null;
+        reject(e);
+      }
+      workerLoad = null;
+
+      // if nothing registered, then something went wrong
+      if (!load.metadata.entry)
+        reject(new Error(load.address + ' did not call System.register or AMD define. If loading a global, ensure the meta format is set to global.'));
+
+      resolve('');
+    });
+  }
+
+  // override fetch to use script injection
+  hook('fetch', function(fetch) {
+    return function(load) {
+      var loader = this;
+
+      if (load.metadata.format == 'json' || !load.metadata.scriptLoad || (!isBrowser && !isWorker))
+        return fetch.call(this, load);
+
+      if (isWorker)
+        return webWorkerImport(loader, load);
+
+      return new Promise(function(resolve, reject) {
+        var s = document.createElement('script');
+        
+        s.async = true;
+
+        if (load.metadata.crossOrigin)
+          s.crossOrigin = load.metadata.crossOrigin;
+
+        if (load.metadata.integrity)
+          s.setAttribute('integrity', load.metadata.integrity);
+
+        if (ieEvents) {
+          s.attachEvent('onreadystatechange', complete);
+          interactiveLoadingScripts.push({
+            script: s,
+            load: load
+          });
+        }
+        else {
+          s.addEventListener('load', complete, false);
+          s.addEventListener('error', error, false);
+        }
+
+        loadingCnt++;
+
+        curSystem = __global.System;
+        curRequire = __global.require;
+
+        s.src = load.address;
+        head.appendChild(s);
+
+        function complete(evt) {
+          if (s.readyState && s.readyState != 'loaded' && s.readyState != 'complete')
+            return;
+
+          loadingCnt--;
+
+          // complete call is sync on execution finish
+          // (in ie already done reductions)
+          if (!load.metadata.entry && !registerQueue.length) {
+            loader.reduceRegister_(load);
+          }
+          else if (!ieEvents) {
+            for (var i = 0; i < registerQueue.length; i++)
+              loader.reduceRegister_(load, registerQueue[i]);
+            registerQueue = [];
+          }
+
+          cleanup();
+
+          // if nothing registered, then something went wrong
+          if (!load.metadata.entry && !load.metadata.bundle)
+            reject(new Error(load.name + ' did not call System.register or AMD define. If loading a global module configure the global name via the meta exports property for script injection support.'));
+
+          resolve('');
+        }
+
+        function error(evt) {
+          cleanup();
+          reject(new Error('Unable to load script ' + load.address));
+        }
+
+        function cleanup() {
+          __global.System = curSystem;
+          __global.require = curRequire;
+
+          if (s.detachEvent) {
+            s.detachEvent('onreadystatechange', complete);
+            for (var i = 0; i < interactiveLoadingScripts.length; i++)
+              if (interactiveLoadingScripts[i].script == s) {
+                if (interactiveScript && interactiveScript.script == s)
+                  interactiveScript = null;
+                interactiveLoadingScripts.splice(i, 1);
+              }
+          }
+          else {
+            s.removeEventListener('load', complete, false);
+            s.removeEventListener('error', error, false);
+          }
+
+          head.removeChild(s);
+        }
+      });
+    };
+  });
+})();
-- 
cgit v1.2.3