1 files changed, 106 insertions, 0 deletions
diff --git a/alarm/node_modules/jsdom/lib/jsdom/vm-shim.js b/alarm/node_modules/jsdom/lib/jsdom/vm-shim.js
new file mode 100644
index 0000000..185679e
--- /dev/null
+++ b/alarm/node_modules/jsdom/lib/jsdom/vm-shim.js
@@ -0,0 +1,106 @@
+"use strict";
+/* eslint-disable no-new-func */
+const acorn = require("acorn");
+const findGlobals = require("acorn-globals");
+const escodegen = require("escodegen");
+const jsGlobals = require("./browser/js-globals.json");
+
+// We can't use the default browserify vm shim because it doesn't work in a web worker.
+
+// "eval" is skipped because it's set to a function that calls `runInContext`:
+const jsGlobalEntriesToInstall = Object.entries(jsGlobals).filter(([name]) => name !== "eval" && name in global);
+
+exports.createContext = function (sandbox) {
+  // TODO: This should probably use a symbol
+  Object.defineProperty(sandbox, "__isVMShimContext", {
+    value: true,
+    writable: true,
+    configurable: true,
+    enumerable: false
+  });
+
+  for (const [globalName, globalPropDesc] of jsGlobalEntriesToInstall) {
+    const propDesc = { ...globalPropDesc, value: global[globalName] };
+    Object.defineProperty(sandbox, globalName, propDesc);
+  }
+
+  Object.defineProperty(sandbox, "eval", {
+    value(code) {
+      return exports.runInContext(code, sandbox);
+    },
+    writable: true,
+    configurable: true,
+    enumerable: false
+  });
+};
+
+exports.isContext = function (sandbox) {
+  return sandbox.__isVMShimContext;
+};
+
+exports.runInContext = function (code, contextifiedSandbox, options) {
+  if (code === "this") {
+    // Special case for during window creation.
+    return contextifiedSandbox;
+  }
+
+  if (options === undefined) {
+    options = {};
+  }
+
+  const comments = [];
+  const tokens = [];
+  const ast = acorn.parse(code, {
+    allowReturnOutsideFunction: true,
+    ranges: true,
+    // collect comments in Esprima's format
+    onComment: comments,
+    // collect token ranges
+    onToken: tokens
+  });
+
+  // make sure we keep comments
+  escodegen.attachComments(ast, comments, tokens);
+
+  const globals = findGlobals(ast);
+  for (let i = 0; i < globals.length; ++i) {
+    if (globals[i].name === "window" || globals[i].name === "this") {
+      continue;
+    }
+
+    const { nodes } = globals[i];
+    for (let j = 0; j < nodes.length; ++j) {
+      const { type, name } = nodes[j];
+      nodes[j].type = "MemberExpression";
+      nodes[j].property = { name, type };
+      nodes[j].computed = false;
+      nodes[j].object = {
+        name: "window",
+        type: "Identifier"
+      };
+    }
+  }
+
+  const lastNode = ast.body[ast.body.length - 1];
+  if (lastNode.type === "ExpressionStatement") {
+    lastNode.type = "ReturnStatement";
+    lastNode.argument = lastNode.expression;
+    delete lastNode.expression;
+  }
+
+  const rewrittenCode = escodegen.generate(ast, { comment: true });
+  const suffix = options.filename !== undefined ? "\n//# sourceURL=" + options.filename : "";
+
+  return Function("window", rewrittenCode + suffix).bind(contextifiedSandbox)(contextifiedSandbox);
+};
+
+exports.Script = class VMShimScript {
+  constructor(code, options) {
+    this._code = code;
+    this._options = options;
+  }
+
+  runInContext(sandbox, options) {
+    return exports.runInContext(this._code, sandbox, { ...this._options, ...options });
+  }
+};