Squashed 'thirdparty/systemjs/' content from commit 5ed69b6

git-subtree-dir: thirdparty/systemjs
git-subtree-split: 5ed69b6344e8fc1cd43bf758350b2236f57e1499

1 files changed, 142 insertions, 0 deletions

diff --git a/lib/global-eval.js b/lib/global-eval.js
new file mode 100644
index 000000000..f27efc222
--- /dev/null
+++ b/lib/global-eval.js
@@ -0,0 +1,142 @@
+// we define a __exec for globally-scoped execution
+// used by module format implementations
+var __exec;
+
+(function() {
+
+  var hasBuffer = typeof Buffer != 'undefined';
+  try {
+    if (hasBuffer && new Buffer('a').toString('base64') != 'YQ==')
+      hasBuffer = false;
+  }
+  catch(e) {
+    hasBuffer = false;
+  }
+
+  var sourceMapPrefix = '\n//# sourceMappingURL=data:application/json;base64,';
+  function inlineSourceMap(sourceMapString) {
+    if (hasBuffer)
+      return sourceMapPrefix + new Buffer(sourceMapString).toString('base64');
+    else if (typeof btoa != 'undefined')
+      return sourceMapPrefix + btoa(unescape(encodeURIComponent(sourceMapString)));
+    else
+      return '';
+  }
+
+  function getSource(load, wrap) {
+    var lastLineIndex = load.source.lastIndexOf('\n');
+
+    // wrap ES formats with a System closure for System global encapsulation
+    if (load.metadata.format == 'global')
+      wrap = false;
+
+    var sourceMap = load.metadata.sourceMap;
+    if (sourceMap) {
+      if (typeof sourceMap != 'object')
+        throw new TypeError('load.metadata.sourceMap must be set to an object.');
+
+      sourceMap = JSON.stringify(sourceMap);
+    }
+
+    return (wrap ? '(function(System, SystemJS) {' : '') + load.source + (wrap ? '\n})(System, System);' : '')
+        // adds the sourceURL comment if not already present
+        + (load.source.substr(lastLineIndex, 15) != '\n//# sourceURL='
+          ? '\n//# sourceURL=' + load.address + (sourceMap ? '!transpiled' : '') : '')
+        // add sourceMappingURL if load.metadata.sourceMap is set
+        + (sourceMap && inlineSourceMap(sourceMap) || '');
+  }
+
+  var curLoad;
+
+  // System.register, System.registerDynamic, AMD define pipeline
+  // if currently evalling code here, immediately reduce the registered entry against the load record
+  hook('pushRegister_', function() {
+    return function(register) {
+      if (!curLoad)
+        return false;
+
+      this.reduceRegister_(curLoad, register);
+      return true;
+    };
+  });
+
+  // System clobbering protection (mostly for Traceur)
+  var curSystem;
+  var callCounter = 0;
+  function preExec(loader, load) {
+    curLoad = load;
+    if (callCounter++ == 0)
+      curSystem = __global.System;
+    __global.System = __global.SystemJS = loader;
+  }
+  function postExec() {
+    if (--callCounter == 0)
+      __global.System = __global.SystemJS = curSystem;
+    curLoad = undefined;
+  }
+
+  var useVm;
+  var vm;
+  __exec = function(load) {
+    if (!load.source)
+      return;
+    if ((load.metadata.integrity || load.metadata.nonce) && supportsScriptExec)
+      return scriptExec.call(this, load);
+    try {
+      preExec(this, load);
+      curLoad = load;
+      // global scoped eval for node (avoids require scope leak)
+      if (!vm && this._nodeRequire) {
+        vm = this._nodeRequire('vm');
+        useVm = vm.runInThisContext("typeof System !== 'undefined' && System") === this;
+      }
+      if (useVm)
+        vm.runInThisContext(getSource(load, true), { filename: load.address + (load.metadata.sourceMap ? '!transpiled' : '') });
+      else
+        (0, eval)(getSource(load, true));
+      postExec();
+    }
+    catch(e) {
+      postExec();
+      throw addToError(e, 'Evaluating ' + load.address);
+    }
+  };
+
+  var supportsScriptExec = false;
+  if (isBrowser && typeof document != 'undefined' && document.getElementsByTagName) {
+    if (!(window.chrome && window.chrome.extension || navigator.userAgent.match(/^Node\.js/)))
+      supportsScriptExec = true;
+  }
+
+  // script execution via injecting a script tag into the page
+  // this allows CSP integrity and nonce to be set for CSP environments
+  var head;
+  function scriptExec(load) {
+    if (!head)
+      head = document.head || document.body || document.documentElement;
+
+    var script = document.createElement('script');
+    script.text = getSource(load, false);
+    var onerror = window.onerror;
+    var e;
+    window.onerror = function(_e) {
+      e = addToError(_e, 'Evaluating ' + load.address);
+      if (onerror)
+        onerror.apply(this, arguments);
+    }
+    preExec(this, load);
+
+    if (load.metadata.integrity)
+      script.setAttribute('integrity', load.metadata.integrity);
+    if (load.metadata.nonce)
+      script.setAttribute('nonce', load.metadata.nonce);
+
+    head.appendChild(script);
+    head.removeChild(script);
+    postExec();
+    window.onerror = onerror;
+    if (e)
+      throw e;
+  }
+
+})();