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15 KiB
{"version":3,"file":"bundle.cjs","sources":["es5/slot.js","es5/index.js"],"sourcesContent":["// This currentContext variable will only be used if the makeSlotClass\n// function is called, which happens only if this is the first copy of the\n// @wry/context package to be imported.\nvar currentContext = null;\n// This unique internal object is used to denote the absence of a value\n// for a given Slot, and is never exposed to outside code.\nvar MISSING_VALUE = {};\nvar idCounter = 1;\n// Although we can't do anything about the cost of duplicated code from\n// accidentally bundling multiple copies of the @wry/context package, we can\n// avoid creating the Slot class more than once using makeSlotClass.\nvar makeSlotClass = function () { return /** @class */ (function () {\n function Slot() {\n // If you have a Slot object, you can find out its slot.id, but you cannot\n // guess the slot.id of a Slot you don't have access to, thanks to the\n // randomized suffix.\n this.id = [\n \"slot\",\n idCounter++,\n Date.now(),\n Math.random().toString(36).slice(2),\n ].join(\":\");\n }\n Slot.prototype.hasValue = function () {\n for (var context_1 = currentContext; context_1; context_1 = context_1.parent) {\n // We use the Slot object iself as a key to its value, which means the\n // value cannot be obtained without a reference to the Slot object.\n if (this.id in context_1.slots) {\n var value = context_1.slots[this.id];\n if (value === MISSING_VALUE)\n break;\n if (context_1 !== currentContext) {\n // Cache the value in currentContext.slots so the next lookup will\n // be faster. This caching is safe because the tree of contexts and\n // the values of the slots are logically immutable.\n currentContext.slots[this.id] = value;\n }\n return true;\n }\n }\n if (currentContext) {\n // If a value was not found for this Slot, it's never going to be found\n // no matter how many times we look it up, so we might as well cache\n // the absence of the value, too.\n currentContext.slots[this.id] = MISSING_VALUE;\n }\n return false;\n };\n Slot.prototype.getValue = function () {\n if (this.hasValue()) {\n return currentContext.slots[this.id];\n }\n };\n Slot.prototype.withValue = function (value, callback, \n // Given the prevalence of arrow functions, specifying arguments is likely\n // to be much more common than specifying `this`, hence this ordering:\n args, thisArg) {\n var _a;\n var slots = (_a = {\n __proto__: null\n },\n _a[this.id] = value,\n _a);\n var parent = currentContext;\n currentContext = { parent: parent, slots: slots };\n try {\n // Function.prototype.apply allows the arguments array argument to be\n // omitted or undefined, so args! is fine here.\n return callback.apply(thisArg, args);\n }\n finally {\n currentContext = parent;\n }\n };\n // Capture the current context and wrap a callback function so that it\n // reestablishes the captured context when called.\n Slot.bind = function (callback) {\n var context = currentContext;\n return function () {\n var saved = currentContext;\n try {\n currentContext = context;\n return callback.apply(this, arguments);\n }\n finally {\n currentContext = saved;\n }\n };\n };\n // Immediately run a callback function without any captured context.\n Slot.noContext = function (callback, \n // Given the prevalence of arrow functions, specifying arguments is likely\n // to be much more common than specifying `this`, hence this ordering:\n args, thisArg) {\n if (currentContext) {\n var saved = currentContext;\n try {\n currentContext = null;\n // Function.prototype.apply allows the arguments array argument to be\n // omitted or undefined, so args! is fine here.\n return callback.apply(thisArg, args);\n }\n finally {\n currentContext = saved;\n }\n }\n else {\n return callback.apply(thisArg, args);\n }\n };\n return Slot;\n}()); };\nfunction maybe(fn) {\n try {\n return fn();\n }\n catch (ignored) { }\n}\n// We store a single global implementation of the Slot class as a permanent\n// non-enumerable property of the globalThis object. This obfuscation does\n// nothing to prevent access to the Slot class, but at least it ensures the\n// implementation (i.e. currentContext) cannot be tampered with, and all copies\n// of the @wry/context package (hopefully just one) will share the same Slot\n// implementation. Since the first copy of the @wry/context package to be\n// imported wins, this technique imposes a steep cost for any future breaking\n// changes to the Slot class.\nvar globalKey = \"@wry/context:Slot\";\nvar host = \n// Prefer globalThis when available.\n// https://github.com/benjamn/wryware/issues/347\nmaybe(function () { return globalThis; }) ||\n // Fall back to global, which works in Node.js and may be converted by some\n // bundlers to the appropriate identifier (window, self, ...) depending on the\n // bundling target. https://github.com/endojs/endo/issues/576#issuecomment-1178515224\n maybe(function () { return global; }) ||\n // Otherwise, use a dummy host that's local to this module. We used to fall\n // back to using the Array constructor as a namespace, but that was flagged in\n // https://github.com/benjamn/wryware/issues/347, and can be avoided.\n Object.create(null);\n// Whichever globalHost we're using, make TypeScript happy about the additional\n// globalKey property.\nvar globalHost = host;\nexport var Slot = globalHost[globalKey] ||\n // Earlier versions of this package stored the globalKey property on the Array\n // constructor, so we check there as well, to prevent Slot class duplication.\n Array[globalKey] ||\n (function (Slot) {\n try {\n Object.defineProperty(globalHost, globalKey, {\n value: Slot,\n enumerable: false,\n writable: false,\n // When it was possible for globalHost to be the Array constructor (a\n // legacy Slot dedup strategy), it was important for the property to be\n // configurable:true so it could be deleted. That does not seem to be as\n // important when globalHost is the global object, but I don't want to\n // cause similar problems again, and configurable:true seems safest.\n // https://github.com/endojs/endo/issues/576#issuecomment-1178274008\n configurable: true\n });\n }\n finally {\n return Slot;\n }\n })(makeSlotClass());\n//# sourceMappingURL=slot.js.map","import { Slot } from \"./slot.js\";\nexport { Slot };\nexport var bind = Slot.bind, noContext = Slot.noContext;\n// Like global.setTimeout, except the callback runs with captured context.\nexport { setTimeoutWithContext as setTimeout };\nfunction setTimeoutWithContext(callback, delay) {\n return setTimeout(bind(callback), delay);\n}\n// Turn any generator function into an async function (using yield instead\n// of await), with context automatically preserved across yields.\nexport function asyncFromGen(genFn) {\n return function () {\n var gen = genFn.apply(this, arguments);\n var boundNext = bind(gen.next);\n var boundThrow = bind(gen.throw);\n return new Promise(function (resolve, reject) {\n function invoke(method, argument) {\n try {\n var result = method.call(gen, argument);\n }\n catch (error) {\n return reject(error);\n }\n var next = result.done ? resolve : invokeNext;\n if (isPromiseLike(result.value)) {\n result.value.then(next, result.done ? reject : invokeThrow);\n }\n else {\n next(result.value);\n }\n }\n var invokeNext = function (value) { return invoke(boundNext, value); };\n var invokeThrow = function (error) { return invoke(boundThrow, error); };\n invokeNext();\n });\n };\n}\nfunction isPromiseLike(value) {\n return value && typeof value.then === \"function\";\n}\n// If you use the fibers npm package to implement coroutines in Node.js,\n// you should call this function at least once to ensure context management\n// remains coherent across any yields.\nvar wrappedFibers = [];\nexport function wrapYieldingFiberMethods(Fiber) {\n // There can be only one implementation of Fiber per process, so this array\n // should never grow longer than one element.\n if (wrappedFibers.indexOf(Fiber) < 0) {\n var wrap = function (obj, method) {\n var fn = obj[method];\n obj[method] = function () {\n return noContext(fn, arguments, this);\n };\n };\n // These methods can yield, according to\n // https://github.com/laverdet/node-fibers/blob/ddebed9b8ae3883e57f822e2108e6943e5c8d2a8/fibers.js#L97-L100\n wrap(Fiber, \"yield\");\n wrap(Fiber.prototype, \"run\");\n wrap(Fiber.prototype, \"throwInto\");\n wrappedFibers.push(Fiber);\n }\n return Fiber;\n}\n//# 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