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Diffstat (limited to 'node_modules/ts-mixer/dist/cjs/proxy.js')
-rw-r--r-- | node_modules/ts-mixer/dist/cjs/proxy.js | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/node_modules/ts-mixer/dist/cjs/proxy.js b/node_modules/ts-mixer/dist/cjs/proxy.js new file mode 100644 index 0000000..f7974c3 --- /dev/null +++ b/node_modules/ts-mixer/dist/cjs/proxy.js @@ -0,0 +1,82 @@ +"use strict"; +Object.defineProperty(exports, "__esModule", { value: true }); +exports.softMixProtos = exports.proxyMix = exports.getIngredientWithProp = void 0; +const util_1 = require("./util"); +/** + * Finds the ingredient with the given prop, searching in reverse order and breadth-first if searching ingredient + * prototypes is required. + */ +const getIngredientWithProp = (prop, ingredients) => { + const protoChains = ingredients.map(ingredient => (0, util_1.protoChain)(ingredient)); + // since we search breadth-first, we need to keep track of our depth in the prototype chains + let protoDepth = 0; + // not all prototype chains are the same depth, so this remains true as long as at least one of the ingredients' + // prototype chains has an object at this depth + let protosAreLeftToSearch = true; + while (protosAreLeftToSearch) { + // with the start of each horizontal slice, we assume this is the one that's deeper than any of the proto chains + protosAreLeftToSearch = false; + // scan through the ingredients right to left + for (let i = ingredients.length - 1; i >= 0; i--) { + const searchTarget = protoChains[i][protoDepth]; + if (searchTarget !== undefined && searchTarget !== null) { + // if we find something, this is proof that this horizontal slice potentially more objects to search + protosAreLeftToSearch = true; + // eureka, we found it + if (Object.getOwnPropertyDescriptor(searchTarget, prop) != undefined) { + return protoChains[i][0]; + } + } + } + protoDepth++; + } + return undefined; +}; +exports.getIngredientWithProp = getIngredientWithProp; +/** + * "Mixes" ingredients by wrapping them in a Proxy. The optional prototype argument allows the mixed object to sit + * downstream of an existing prototype chain. Note that "properties" cannot be added, deleted, or modified. + */ +const proxyMix = (ingredients, prototype = Object.prototype) => new Proxy({}, { + getPrototypeOf() { + return prototype; + }, + setPrototypeOf() { + throw Error('Cannot set prototype of Proxies created by ts-mixer'); + }, + getOwnPropertyDescriptor(_, prop) { + return Object.getOwnPropertyDescriptor((0, exports.getIngredientWithProp)(prop, ingredients) || {}, prop); + }, + defineProperty() { + throw new Error('Cannot define new properties on Proxies created by ts-mixer'); + }, + has(_, prop) { + return (0, exports.getIngredientWithProp)(prop, ingredients) !== undefined || prototype[prop] !== undefined; + }, + get(_, prop) { + return ((0, exports.getIngredientWithProp)(prop, ingredients) || prototype)[prop]; + }, + set(_, prop, val) { + const ingredientWithProp = (0, exports.getIngredientWithProp)(prop, ingredients); + if (ingredientWithProp === undefined) + throw new Error('Cannot set new properties on Proxies created by ts-mixer'); + ingredientWithProp[prop] = val; + return true; + }, + deleteProperty() { + throw new Error('Cannot delete properties on Proxies created by ts-mixer'); + }, + ownKeys() { + return ingredients + .map(Object.getOwnPropertyNames) + .reduce((prev, curr) => curr.concat(prev.filter(key => curr.indexOf(key) < 0))); + }, +}); +exports.proxyMix = proxyMix; +/** + * Creates a new proxy-prototype object that is a "soft" mixture of the given prototypes. The mixing is achieved by + * proxying all property access to the ingredients. This is not ES5 compatible and less performant. However, any + * changes made to the source prototypes will be reflected in the proxy-prototype, which may be desirable. + */ +const softMixProtos = (ingredients, constructor) => (0, exports.proxyMix)([...ingredients, { constructor }]); +exports.softMixProtos = softMixProtos; |