545 lines
24 KiB
JavaScript
545 lines
24 KiB
JavaScript
/*!
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* Microsoft Dynamic Proto Utility, 1.1.9
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* Copyright (c) Microsoft and contributors. All rights reserved.
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*/
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var _a;
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var UNDEFINED = "undefined";
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/**
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* Constant string defined to support minimization
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* @ignore
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*/
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var Constructor = 'constructor';
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/**
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* Constant string defined to support minimization
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* @ignore
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*/
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var Prototype = 'prototype';
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/**
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* Constant string defined to support minimization
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* @ignore
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*/
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var strFunction = 'function';
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/**
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* Used to define the name of the instance function lookup table
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* @ignore
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*/
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var DynInstFuncTable = '_dynInstFuncs';
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/**
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* Name used to tag the dynamic prototype function
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* @ignore
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*/
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var DynProxyTag = '_isDynProxy';
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/**
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* Name added to a prototype to define the dynamic prototype "class" name used to lookup the function table
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* @ignore
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*/
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var DynClassName = '_dynClass';
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/**
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* Prefix added to the classname to avoid any name clashes with other instance level properties
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* @ignore
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*/
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var DynClassNamePrefix = '_dynCls$';
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/**
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* A tag which is used to check if we have already to attempted to set the instance function if one is not present
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* @ignore
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*/
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var DynInstChkTag = '_dynInstChk';
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/**
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* A tag which is used to check if we are allows to try and set an instance function is one is not present. Using the same
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* tag name as the function level but a different const name for readability only.
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*/
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var DynAllowInstChkTag = DynInstChkTag;
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/**
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* The global (imported) instances where the global performance options are stored
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*/
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var DynProtoDefaultOptions = '_dfOpts';
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/**
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* Value used as the name of a class when it cannot be determined
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* @ignore
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*/
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var UnknownValue = '_unknown_';
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/**
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* Constant string defined to support minimization
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* @ignore
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*/
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var str__Proto = "__proto__";
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/**
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* The polyfill version of __proto__ so that it doesn't cause issues for anyone not expecting it to exist
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*/
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var DynProtoBaseProto = "_dyn" + str__Proto;
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/**
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* Runtime Global holder for dynamicProto settings
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*/
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var DynProtoGlobalSettings = "__dynProto$Gbl";
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/**
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* Track the current prototype for IE8 as you can't look back to get the prototype
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*/
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var DynProtoCurrent = "_dynInstProto";
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/**
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* Constant string defined to support minimization
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* @ignore
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*/
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var strUseBaseInst = 'useBaseInst';
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/**
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* Constant string defined to support minimization
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* @ignore
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*/
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var strSetInstFuncs = 'setInstFuncs';
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var Obj = Object;
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/**
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* Pre-lookup to check if we are running on a modern browser (i.e. not IE8)
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* @ignore
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*/
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var _objGetPrototypeOf = Obj["getPrototypeOf"];
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/**
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* Pre-lookup to check for the existence of this function
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*/
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var _objGetOwnProps = Obj["getOwnPropertyNames"];
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/**
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* Gets the runtime global reference
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* @returns
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*/
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function _getGlobal() {
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var result;
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if (typeof globalThis !== UNDEFINED) {
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result = globalThis;
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}
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if (!result && typeof self !== UNDEFINED) {
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result = self;
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}
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if (!result && typeof window !== UNDEFINED) {
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result = window;
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}
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if (!result && typeof global !== UNDEFINED) {
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result = global;
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}
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return result || {};
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}
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// Since 1.1.7 moving these to the runtime global to work around mixed version and module issues
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// See Issue https://github.com/microsoft/DynamicProto-JS/issues/57 for details
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var _gbl = _getGlobal();
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var _gblInst = _gbl[DynProtoGlobalSettings] || (_gbl[DynProtoGlobalSettings] = {
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o: (_a = {},
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_a[strSetInstFuncs] = true,
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_a[strUseBaseInst] = true,
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_a),
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n: 1000 // Start new global index @ 1000 so we "fix" some cases when mixed with 1.1.6 or earlier
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});
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/**
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* Helper to check if the object contains a property of the name
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* @ignore
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*/
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function _hasOwnProperty(obj, prop) {
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return obj && Obj[Prototype].hasOwnProperty.call(obj, prop);
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}
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/**
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* Helper used to check whether the target is an Object prototype or Array prototype
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* @ignore
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*/
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function _isObjectOrArrayPrototype(target) {
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return target && (target === Obj[Prototype] || target === Array[Prototype]);
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}
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/**
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* Helper used to check whether the target is an Object prototype, Array prototype or Function prototype
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* @ignore
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*/
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function _isObjectArrayOrFunctionPrototype(target) {
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return _isObjectOrArrayPrototype(target) || target === Function[Prototype];
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}
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/**
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* Helper used to get the prototype of the target object as getPrototypeOf is not available in an ES3 environment.
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* @ignore
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*/
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function _getObjProto(target) {
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var newProto;
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if (target) {
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// This method doesn't exist in older browsers (e.g. IE8)
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if (_objGetPrototypeOf) {
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return _objGetPrototypeOf(target);
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}
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var curProto = target[str__Proto] || target[Prototype] || (target[Constructor] ? target[Constructor][Prototype] : null);
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// Using the pre-calculated value as IE8 doesn't support looking up the prototype of a prototype and thus fails for more than 1 base class
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newProto = target[DynProtoBaseProto] || curProto;
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if (!_hasOwnProperty(target, DynProtoBaseProto)) {
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// As this prototype doesn't have this property then this is from an inherited class so newProto is the base to return so save it
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// so we can look it up value (which for a multiple hierarchy dynamicProto will be the base class)
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delete target[DynProtoCurrent]; // Delete any current value allocated to this instance so we pick up the value from prototype hierarchy
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newProto = target[DynProtoBaseProto] = target[DynProtoCurrent] || target[DynProtoBaseProto];
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target[DynProtoCurrent] = curProto;
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}
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}
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return newProto;
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}
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/**
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* Helper to get the properties of an object, including none enumerable ones as functions on a prototype in ES6
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* are not enumerable.
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* @param target
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*/
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function _forEachProp(target, func) {
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var props = [];
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if (_objGetOwnProps) {
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props = _objGetOwnProps(target);
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}
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else {
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for (var name_1 in target) {
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if (typeof name_1 === "string" && _hasOwnProperty(target, name_1)) {
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props.push(name_1);
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}
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}
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}
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if (props && props.length > 0) {
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for (var lp = 0; lp < props.length; lp++) {
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func(props[lp]);
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}
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}
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}
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/**
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* Helper function to check whether the provided function name is a potential candidate for dynamic
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* callback and prototype generation.
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* @param target The target object, may be a prototype or class object
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* @param funcName The function name
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* @param skipOwn Skips the check for own property
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* @ignore
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*/
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function _isDynamicCandidate(target, funcName, skipOwn) {
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return (funcName !== Constructor && typeof target[funcName] === strFunction && (skipOwn || _hasOwnProperty(target, funcName)));
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}
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/**
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* Helper to throw a TypeError exception
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* @param message the message
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* @ignore
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*/
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function _throwTypeError(message) {
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throw new TypeError("DynamicProto: " + message);
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}
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/**
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* Returns a collection of the instance functions that are defined directly on the thisTarget object, it does
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* not return any inherited functions
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* @param thisTarget The object to get the instance functions from
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* @ignore
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*/
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function _getInstanceFuncs(thisTarget) {
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// Get the base proto
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var instFuncs = {};
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// Save any existing instance functions
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_forEachProp(thisTarget, function (name) {
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// Don't include any dynamic prototype instances - as we only want the real functions
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if (!instFuncs[name] && _isDynamicCandidate(thisTarget, name, false)) {
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// Create an instance callback for passing the base function to the caller
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instFuncs[name] = thisTarget[name];
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}
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});
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return instFuncs;
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}
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/**
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* Returns whether the value is included in the array
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* @param values The array of values
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* @param value The value
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*/
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function _hasVisited(values, value) {
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for (var lp = values.length - 1; lp >= 0; lp--) {
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if (values[lp] === value) {
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return true;
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}
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}
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return false;
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}
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/**
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* Returns an object that contains callback functions for all "base/super" functions, this is used to "save"
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* enabling calling super.xxx() functions without requiring that the base "class" has defined a prototype references
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* @param target The current instance
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* @ignore
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*/
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function _getBaseFuncs(classProto, thisTarget, instFuncs, useBaseInst) {
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function _instFuncProxy(target, funcHost, funcName) {
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var theFunc = funcHost[funcName];
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if (theFunc[DynProxyTag] && useBaseInst) {
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// grab and reuse the hosted looking function (if available) otherwise the original passed function
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var instFuncTable = target[DynInstFuncTable] || {};
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if (instFuncTable[DynAllowInstChkTag] !== false) {
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theFunc = (instFuncTable[funcHost[DynClassName]] || {})[funcName] || theFunc;
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}
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}
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return function () {
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// eslint-disable-next-line prefer-rest-params
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return theFunc.apply(target, arguments);
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};
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}
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// Start creating a new baseFuncs by creating proxies for the instance functions (as they may get replaced)
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var baseFuncs = {};
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_forEachProp(instFuncs, function (name) {
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// Create an instance callback for passing the base function to the caller
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baseFuncs[name] = _instFuncProxy(thisTarget, instFuncs, name);
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});
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// Get the base prototype functions
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var baseProto = _getObjProto(classProto);
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var visited = [];
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// Don't include base object functions for Object, Array or Function
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while (baseProto && !_isObjectArrayOrFunctionPrototype(baseProto) && !_hasVisited(visited, baseProto)) {
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// look for prototype functions
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_forEachProp(baseProto, function (name) {
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// Don't include any dynamic prototype instances - as we only want the real functions
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// For IE 7/8 the prototype lookup doesn't provide the full chain so we need to bypass the
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// hasOwnProperty check we get all of the methods, main difference is that IE7/8 doesn't return
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// the Object prototype methods while bypassing the check
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if (!baseFuncs[name] && _isDynamicCandidate(baseProto, name, !_objGetPrototypeOf)) {
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// Create an instance callback for passing the base function to the caller
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baseFuncs[name] = _instFuncProxy(thisTarget, baseProto, name);
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}
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});
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// We need to find all possible functions that might be overloaded by walking the entire prototype chain
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// This avoids the caller from needing to check whether it's direct base class implements the function or not
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// by walking the entire chain it simplifies the usage and issues from upgrading any of the base classes.
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visited.push(baseProto);
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baseProto = _getObjProto(baseProto);
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}
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return baseFuncs;
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}
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function _getInstFunc(target, funcName, proto, currentDynProtoProxy) {
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var instFunc = null;
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// We need to check whether the class name is defined directly on this prototype otherwise
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// it will walk the proto chain and return any parent proto classname.
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if (target && _hasOwnProperty(proto, DynClassName)) {
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var instFuncTable = target[DynInstFuncTable] || {};
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instFunc = (instFuncTable[proto[DynClassName]] || {})[funcName];
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if (!instFunc) {
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// Avoid stack overflow from recursive calling the same function
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_throwTypeError("Missing [" + funcName + "] " + strFunction);
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}
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// We have the instance function, lets check it we can speed up further calls
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// by adding the instance function back directly on the instance (avoiding the dynamic func lookup)
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if (!instFunc[DynInstChkTag] && instFuncTable[DynAllowInstChkTag] !== false) {
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// If the instance already has an instance function we can't replace it
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var canAddInst = !_hasOwnProperty(target, funcName);
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// Get current prototype
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var objProto = _getObjProto(target);
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var visited = [];
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// Lookup the function starting at the top (instance level prototype) and traverse down, if the first matching function
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// if nothing is found or if the first hit is a dynamic proto instance then we can safely add an instance shortcut
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while (canAddInst && objProto && !_isObjectArrayOrFunctionPrototype(objProto) && !_hasVisited(visited, objProto)) {
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var protoFunc = objProto[funcName];
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if (protoFunc) {
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canAddInst = (protoFunc === currentDynProtoProxy);
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break;
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}
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// We need to find all possible initial functions to ensure that we don't bypass a valid override function
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visited.push(objProto);
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objProto = _getObjProto(objProto);
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}
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try {
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if (canAddInst) {
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// This instance doesn't have an instance func and the class hierarchy does have a higher level prototype version
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// so it's safe to directly assign for any subsequent calls (for better performance)
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target[funcName] = instFunc;
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}
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// Block further attempts to set the instance function for any
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instFunc[DynInstChkTag] = 1;
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}
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catch (e) {
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// Don't crash if the object is readonly or the runtime doesn't allow changing this
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// And set a flag so we don't try again for any function
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instFuncTable[DynAllowInstChkTag] = false;
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}
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}
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}
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return instFunc;
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}
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function _getProtoFunc(funcName, proto, currentDynProtoProxy) {
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var protoFunc = proto[funcName];
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// Check that the prototype function is not a self reference -- try to avoid stack overflow!
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if (protoFunc === currentDynProtoProxy) {
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// It is so lookup the base prototype
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protoFunc = _getObjProto(proto)[funcName];
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}
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if (typeof protoFunc !== strFunction) {
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_throwTypeError("[" + funcName + "] is not a " + strFunction);
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}
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return protoFunc;
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}
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/**
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* Add the required dynamic prototype methods to the the class prototype
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* @param proto - The class prototype
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* @param className - The instance classname
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* @param target - The target instance
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* @param baseInstFuncs - The base instance functions
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* @param setInstanceFunc - Flag to allow prototype function to reset the instance function if one does not exist
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* @ignore
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*/
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function _populatePrototype(proto, className, target, baseInstFuncs, setInstanceFunc) {
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function _createDynamicPrototype(proto, funcName) {
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var dynProtoProxy = function () {
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// Use the instance or prototype function
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var instFunc = _getInstFunc(this, funcName, proto, dynProtoProxy) || _getProtoFunc(funcName, proto, dynProtoProxy);
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// eslint-disable-next-line prefer-rest-params
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return instFunc.apply(this, arguments);
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};
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// Tag this function as a proxy to support replacing dynamic proxy elements (primary use case is for unit testing
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// via which can dynamically replace the prototype function reference)
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dynProtoProxy[DynProxyTag] = 1;
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return dynProtoProxy;
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}
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if (!_isObjectOrArrayPrototype(proto)) {
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var instFuncTable = target[DynInstFuncTable] = target[DynInstFuncTable] || {};
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var instFuncs_1 = instFuncTable[className] = (instFuncTable[className] || {}); // fetch and assign if as it may not exist yet
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// Set whether we are allow to lookup instances, if someone has set to false then do not re-enable
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if (instFuncTable[DynAllowInstChkTag] !== false) {
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instFuncTable[DynAllowInstChkTag] = !!setInstanceFunc;
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}
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_forEachProp(target, function (name) {
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// Only add overridden functions
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if (_isDynamicCandidate(target, name, false) && target[name] !== baseInstFuncs[name]) {
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// Save the instance Function to the lookup table and remove it from the instance as it's not a dynamic proto function
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instFuncs_1[name] = target[name];
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delete target[name];
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// Add a dynamic proto if one doesn't exist or if a prototype function exists and it's not a dynamic one
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if (!_hasOwnProperty(proto, name) || (proto[name] && !proto[name][DynProxyTag])) {
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proto[name] = _createDynamicPrototype(proto, name);
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}
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}
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});
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}
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}
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/**
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* Checks whether the passed prototype object appears to be correct by walking the prototype hierarchy of the instance
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* @param classProto The class prototype instance
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* @param thisTarget The current instance that will be checked whether the passed prototype instance is in the hierarchy
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* @ignore
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*/
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function _checkPrototype(classProto, thisTarget) {
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// This method doesn't existing in older browsers (e.g. IE8)
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if (_objGetPrototypeOf) {
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// As this is primarily a coding time check, don't bother checking if running in IE8 or lower
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var visited = [];
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var thisProto = _getObjProto(thisTarget);
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while (thisProto && !_isObjectArrayOrFunctionPrototype(thisProto) && !_hasVisited(visited, thisProto)) {
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if (thisProto === classProto) {
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return true;
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}
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// This avoids the caller from needing to check whether it's direct base class implements the function or not
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// by walking the entire chain it simplifies the usage and issues from upgrading any of the base classes.
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visited.push(thisProto);
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thisProto = _getObjProto(thisProto);
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}
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return false;
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}
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// If objGetPrototypeOf doesn't exist then just assume everything is ok.
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return true;
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}
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/**
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* Gets the current prototype name using the ES6 name if available otherwise falling back to a use unknown as the name.
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* It's not critical for this to return a name, it's used to decorate the generated unique name for easier debugging only.
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* @param target
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* @param unknownValue
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* @ignore
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*/
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function _getObjName(target, unknownValue) {
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if (_hasOwnProperty(target, Prototype)) {
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// Look like a prototype
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return target.name || unknownValue || UnknownValue;
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}
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return (((target || {})[Constructor]) || {}).name || unknownValue || UnknownValue;
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}
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/**
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* Helper function when creating dynamic (inline) functions for classes, this helper performs the following tasks :-
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* - Saves references to all defined base class functions
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* - Calls the delegateFunc with the current target (this) and a base object reference that can be used to call all "super" functions.
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* - Will populate the class prototype for all overridden functions to support class extension that call the prototype instance.
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* Callers should use this helper when declaring all function within the constructor of a class, as mentioned above the delegateFunc is
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* passed both the target "this" and an object that can be used to call any base (super) functions, using this based object in place of
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* super.XXX() (which gets expanded to _super.prototype.XXX()) provides a better minification outcome and also ensures the correct "this"
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* context is maintained as TypeScript creates incorrect references using super.XXXX() for dynamically defined functions i.e. Functions
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* defined in the constructor or some other function (rather than declared as complete typescript functions).
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* ### Usage
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* ```typescript
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* import dynamicProto from "@microsoft/dynamicproto-js";
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* class ExampleClass extends BaseClass {
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* constructor() {
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* dynamicProto(ExampleClass, this, (_self, base) => {
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* // This will define a function that will be converted to a prototype function
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* _self.newFunc = () => {
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* // Access any "this" instance property
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* if (_self.someProperty) {
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* ...
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* }
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* }
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* // This will define a function that will be converted to a prototype function
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* _self.myFunction = () => {
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* // Access any "this" instance property
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* if (_self.someProperty) {
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* // Call the base version of the function that we are overriding
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* base.myFunction();
|
|
* }
|
|
* ...
|
|
* }
|
|
* _self.initialize = () => {
|
|
* ...
|
|
* }
|
|
* // Warnings: While the following will work as _self is simply a reference to
|
|
* // this, if anyone overrides myFunction() the overridden will be called first
|
|
* // as the normal JavaScript method resolution will occur and the defined
|
|
* // _self.initialize() function is actually gets removed from the instance and
|
|
* // a proxy prototype version is created to reference the created method.
|
|
* _self.initialize();
|
|
* });
|
|
* }
|
|
* }
|
|
* ```
|
|
* @typeparam DPType This is the generic type of the class, used to keep intellisense valid
|
|
* @typeparam DPCls The type that contains the prototype of the current class
|
|
* @param theClass - This is the current class instance which contains the prototype for the current class
|
|
* @param target - The current "this" (target) reference, when the class has been extended this.prototype will not be the 'theClass' value.
|
|
* @param delegateFunc - The callback function (closure) that will create the dynamic function
|
|
* @param options - Additional options to configure how the dynamic prototype operates
|
|
*/
|
|
function dynamicProto(theClass, target, delegateFunc, options) {
|
|
// Make sure that the passed theClass argument looks correct
|
|
if (!_hasOwnProperty(theClass, Prototype)) {
|
|
_throwTypeError("theClass is an invalid class definition.");
|
|
}
|
|
// Quick check to make sure that the passed theClass argument looks correct (this is a common copy/paste error)
|
|
var classProto = theClass[Prototype];
|
|
if (!_checkPrototype(classProto, target)) {
|
|
_throwTypeError("[" + _getObjName(theClass) + "] not in hierarchy of [" + _getObjName(target) + "]");
|
|
}
|
|
var className = null;
|
|
if (_hasOwnProperty(classProto, DynClassName)) {
|
|
// Only grab the class name if it's defined on this prototype (i.e. don't walk the prototype chain)
|
|
className = classProto[DynClassName];
|
|
}
|
|
else {
|
|
// As not all browser support name on the prototype creating a unique dynamic one if we have not already
|
|
// assigned one, so we can use a simple string as the lookup rather than an object for the dynamic instance
|
|
// function table lookup.
|
|
className = DynClassNamePrefix + _getObjName(theClass, "_") + "$" + _gblInst.n;
|
|
_gblInst.n++;
|
|
classProto[DynClassName] = className;
|
|
}
|
|
var perfOptions = dynamicProto[DynProtoDefaultOptions];
|
|
var useBaseInst = !!perfOptions[strUseBaseInst];
|
|
if (useBaseInst && options && options[strUseBaseInst] !== undefined) {
|
|
useBaseInst = !!options[strUseBaseInst];
|
|
}
|
|
// Get the current instance functions
|
|
var instFuncs = _getInstanceFuncs(target);
|
|
// Get all of the functions for any base instance (before they are potentially overridden)
|
|
var baseFuncs = _getBaseFuncs(classProto, target, instFuncs, useBaseInst);
|
|
// Execute the delegate passing in both the current target "this" and "base" function references
|
|
// Note casting the same type as we don't actually have the base class here and this will provide some intellisense support
|
|
delegateFunc(target, baseFuncs);
|
|
// Don't allow setting instance functions for older IE instances
|
|
var setInstanceFunc = !!_objGetPrototypeOf && !!perfOptions[strSetInstFuncs];
|
|
if (setInstanceFunc && options) {
|
|
setInstanceFunc = !!options[strSetInstFuncs];
|
|
}
|
|
// Populate the Prototype for any overridden instance functions
|
|
_populatePrototype(classProto, className, target, instFuncs, setInstanceFunc !== false);
|
|
}
|
|
/**
|
|
* Exposes the default global options to allow global configuration, if the global values are disabled these will override
|
|
* any passed values. This is primarily exposed to support unit-testing without the need for individual classes to expose
|
|
* their internal usage of dynamic proto.
|
|
*/
|
|
dynamicProto[DynProtoDefaultOptions] = _gblInst.o;
|
|
|
|
export { dynamicProto as default };
|