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Diffstat (limited to 'node_modules/fbjs/lib/enumerate.js.flow')
| -rw-r--r-- | node_modules/fbjs/lib/enumerate.js.flow | 263 |
1 files changed, 0 insertions, 263 deletions
diff --git a/node_modules/fbjs/lib/enumerate.js.flow b/node_modules/fbjs/lib/enumerate.js.flow deleted file mode 100644 index 39a256052..000000000 --- a/node_modules/fbjs/lib/enumerate.js.flow +++ /dev/null @@ -1,263 +0,0 @@ -/** - * Copyright (c) 2013-present, Facebook, Inc. - * - * This source code is licensed under the MIT license found in the - * LICENSE file in the root directory of this source tree. - * - * @providesModule enumerate - * - */ - -const KIND_KEYS = 'keys'; -const KIND_VALUES = 'values'; -const KIND_ENTRIES = 'entries'; - -/** - * Specific Array iterators. - */ -const ArrayIterators = function () { - - let hasNative = hasNativeIterator(Array); - let ArrayIterator; - - if (!hasNative) { - ArrayIterator = class ArrayIterator { - // 22.1.5.1 CreateArrayIterator Abstract Operation - constructor(array, kind) { - this._iteratedObject = array; - this._kind = kind; - this._nextIndex = 0; - } - - // 22.1.5.2.1 %ArrayIteratorPrototype%.next() - next() { - if (this._iteratedObject == null) { - return { value: undefined, done: true }; - } - - let array = this._iteratedObject; - let len = this._iteratedObject.length; - let index = this._nextIndex; - let kind = this._kind; - - if (index >= len) { - this._iteratedObject = undefined; - return { value: undefined, done: true }; - } - - this._nextIndex = index + 1; - - if (kind === KIND_KEYS) { - return { value: index, done: false }; - } else if (kind === KIND_VALUES) { - return { value: array[index], done: false }; - } else if (kind === KIND_ENTRIES) { - return { value: [index, array[index]], done: false }; - } - } - - // 22.1.5.2.2 %ArrayIteratorPrototype%[@@iterator]() - [Symbol.iterator]() { - return this; - } - }; - } - - return { - keys: hasNative ? array => array.keys() : array => new ArrayIterator(array, KIND_KEYS), - - values: hasNative ? array => array.values() : array => new ArrayIterator(array, KIND_VALUES), - - entries: hasNative ? array => array.entries() : array => new ArrayIterator(array, KIND_ENTRIES) - }; -}(); - -// ----------------------------------------------------------------- - -/** - * Specific String iterators. - */ -const StringIterators = function () { - - let hasNative = hasNativeIterator(String); - let StringIterator; - - if (!hasNative) { - StringIterator = class StringIterator { - // 21.1.5.1 CreateStringIterator Abstract Operation - constructor(string) { - this._iteratedString = string; - this._nextIndex = 0; - } - - // 21.1.5.2.1 %StringIteratorPrototype%.next() - next() { - if (this._iteratedString == null) { - return { value: undefined, done: true }; - } - - let index = this._nextIndex; - let s = this._iteratedString; - let len = s.length; - - if (index >= len) { - this._iteratedString = undefined; - return { value: undefined, done: true }; - } - - let ret; - let first = s.charCodeAt(index); - - if (first < 0xD800 || first > 0xDBFF || index + 1 === len) { - ret = s[index]; - } else { - let second = s.charCodeAt(index + 1); - if (second < 0xDC00 || second > 0xDFFF) { - ret = s[index]; - } else { - ret = s[index] + s[index + 1]; - } - } - - this._nextIndex = index + ret.length; - - return { value: ret, done: false }; - } - - // 21.1.5.2.2 %StringIteratorPrototype%[@@iterator]() - [Symbol.iterator]() { - return this; - } - }; - } - - return { - keys() { - throw TypeError(`Strings default iterator doesn't implement keys.`); - }, - - values: hasNative ? string => string[Symbol.iterator]() : string => new StringIterator(string), - - entries() { - throw TypeError(`Strings default iterator doesn't implement entries.`); - } - }; -}(); - -function hasNativeIterator(classObject) { - return typeof classObject.prototype[Symbol.iterator] === 'function' && typeof classObject.prototype.values === 'function' && typeof classObject.prototype.keys === 'function' && typeof classObject.prototype.entries === 'function'; -} - -// ----------------------------------------------------------------- - -/** - * Generic object iterator. - */ -class ObjectIterator { - constructor(object, kind) { - this._iteratedObject = object; - this._kind = kind; - this._keys = Object.keys(object); - this._nextIndex = 0; - } - - next() { - let len = this._keys.length; - let index = this._nextIndex; - let kind = this._kind; - let key = this._keys[index]; - - if (index >= len) { - this._iteratedObject = undefined; - return { value: undefined, done: true }; - } - - this._nextIndex = index + 1; - - if (kind === KIND_KEYS) { - return { value: key, done: false }; - } else if (kind === KIND_VALUES) { - return { value: this._iteratedObject[key], done: false }; - } else if (kind === KIND_ENTRIES) { - return { value: [key, this._iteratedObject[key]], done: false }; - } - } - - [Symbol.iterator]() { - return this; - } -} - -/** - * Generic object iterator, iterates over all own enumerable - * properties. Used only if if no specific iterator is available, - * and object don't implement iterator protocol. - */ -const GenericIterators = { - keys(object) { - return new ObjectIterator(object, KIND_KEYS); - }, - - values(object) { - return new ObjectIterator(object, KIND_VALUES); - }, - - entries(object) { - return new ObjectIterator(object, KIND_ENTRIES); - } -}; - -// ----------------------------------------------------------------- - -/** - * Main iterator function. Returns default iterator based - * on the class of an instance. - */ -function enumerate(object, kind) { - - // First check specific iterators. - if (typeof object === 'string') { - return StringIterators[kind || KIND_VALUES](object); - } else if (Array.isArray(object)) { - return ArrayIterators[kind || KIND_VALUES](object); - - // Then see if an object implements own. - } else if (object[Symbol.iterator]) { - return object[Symbol.iterator](); - - // And fallback to generic with entries. - } else { - return GenericIterators[kind || KIND_ENTRIES](object); - } -} - -Object.assign(enumerate, { - /** - * Export constants - */ - - KIND_KEYS, - KIND_VALUES, - KIND_ENTRIES, - - /** - * Convenient explicit iterators for special kinds. - */ - - keys(object) { - return enumerate(object, KIND_KEYS); - }, - - values(object) { - return enumerate(object, KIND_VALUES); - }, - - entries(object) { - return enumerate(object, KIND_ENTRIES); - }, - - generic: GenericIterators.entries - -}); - -module.exports = enumerate;
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