| 1 | /*!
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| 2 | * Copyright (c) 2017-2018 by The Funfix Project Developers.
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| 3 | * Some rights reserved.
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| 4 | *
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| 5 | * Licensed under the Apache License, Version 2.0 (the "License");
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| 6 | * you may not use this file except in compliance with the License.
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| 7 | * You may obtain a copy of the License at
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| 8 | *
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| 9 | * http://www.apache.org/licenses/LICENSE-2.0
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| 10 | *
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| 11 | * Unless required by applicable law or agreed to in writing, software
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| 12 | * distributed under the License is distributed on an "AS IS" BASIS,
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| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 14 | * See the License for the specific language governing permissions and
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| 15 | * limitations under the License.
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| 16 | */
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| 17 | /**
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| 18 | * Given a function, converts it into a method where `this` gets
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| 19 | * passed around as the last argument.
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| 20 | */
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| 21 | export function convertToMethod(f) {
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| 22 | return function () {
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| 23 | const args = Array.prototype.slice.call(arguments);
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| 24 | args.push(this);
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| 25 | return f.apply(undefined, args);
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| 26 | };
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| 27 | }
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| 28 | /**
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| 29 | * Given a constructor, searches for all Fantasy-Land compatible
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| 30 | * methods registered on its `prototype` and also registers them
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| 31 | * using Fantasy-Land compatible symbols.
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| 32 | *
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| 33 | * For example:
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| 34 | *
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| 35 | * ```typescript
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| 36 | * class Box<A> {
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| 37 | * constructor(public readonly value: A) {}
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| 38 | *
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| 39 | * // Setoid
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| 40 | * equals(that: Box<A>) {
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| 41 | * return that && this.value === that.value
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| 42 | * }
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| 43 | * // Functor
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| 44 | * map<B>(f: (a: A) => B): Box<B> {
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| 45 | * return new Box(f(this.value))
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| 46 | * }
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| 47 | * }
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| 48 | *
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| 49 | * // Registering Fantasy-Land compatible symbols
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| 50 | * fantasyLandRegister(Box)
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| 51 | * ```
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| 52 | *
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| 53 | * The above registration call would make `fantasy-land/equals` and
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| 54 | * `fantasy-land/functor` available on `Box.prototype`.
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| 55 | *
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| 56 | * @private
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| 57 | * @Hidden
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| 58 | */
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| 59 | export function fantasyLandRegister(cls, monad, setoid) {
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| 60 | const c = cls;
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| 61 | const p = c.prototype;
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| 62 | const fl = "fantasy-land/";
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| 63 | const equals = "equals";
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| 64 | const flEquals = fl + equals;
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| 65 | const map = "map";
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| 66 | const flMap = fl + map;
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| 67 | const ap = "ap";
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| 68 | const flAp = fl + ap;
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| 69 | const flOf = fl + "of";
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| 70 | const chain = "chain";
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| 71 | const flChain = fl + chain;
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| 72 | const chainRec = "chainRec";
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| 73 | const flChainRec = fl + chainRec;
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| 74 | // Setoid
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| 75 | if (p[equals]) {
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| 76 | p[flEquals] = p[equals];
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| 77 | }
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| 78 | else {
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| 79 | /* istanbul ignore else */
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| 80 | if (setoid)
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| 81 | p[flEquals] = convertToMethod(setoid.equals);
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| 82 | }
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| 83 | // Functor
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| 84 | if (p[map]) {
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| 85 | p[flMap] = p[map];
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| 86 | }
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| 87 | else {
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| 88 | /* istanbul ignore else */
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| 89 | if (monad)
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| 90 | p[flMap] = convertToMethod(monad.map);
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| 91 | }
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| 92 | // Apply
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| 93 | if (p[ap]) {
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| 94 | p[flAp] = p[ap];
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| 95 | }
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| 96 | else {
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| 97 | /* istanbul ignore else */
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| 98 | if (monad)
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| 99 | p[flAp] = convertToMethod(monad.ap);
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| 100 | }
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| 101 | // Applicative
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| 102 | if (c["pure"]) {
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| 103 | c[flOf] = c["pure"];
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| 104 | }
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| 105 | else {
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| 106 | /* istanbul ignore else */
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| 107 | if (monad)
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| 108 | c[flOf] = monad.of;
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| 109 | }
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| 110 | // Chain
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| 111 | if (p[chain]) {
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| 112 | p[flChain] = p[chain];
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| 113 | }
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| 114 | else {
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| 115 | /* istanbul ignore else */
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| 116 | if (monad)
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| 117 | p[flChain] = convertToMethod(monad.chain);
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| 118 | }
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| 119 | // ChainRec
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| 120 | if (c[chainRec]) {
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| 121 | c[flChainRec] = c[chainRec];
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| 122 | }
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| 123 | else {
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| 124 | /* istanbul ignore else */
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| 125 | if (monad)
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| 126 | c[flChainRec] = monad.chainRec;
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| 127 | }
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| 128 | }
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| 129 | //# sourceMappingURL=internals.js.map |
| \ | No newline at end of file |