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| 1 | +// https://github.com/milesj/docusaurus-plugin-typedoc-api/issues/120 |
| 2 | + |
| 3 | +/** |
| 4 | + * Module interface for values that have equivalence relation |
| 5 | + */ |
| 6 | +export interface Equal<T> { |
| 7 | + /** |
| 8 | + * Alias to '==' |
| 9 | + * |
| 10 | + * @example |
| 11 | + * ```ts |
| 12 | + * type T = // ... |
| 13 | + * const TEqual: Equal<T>; |
| 14 | + * TEqual.equals(value, value); // true |
| 15 | + * TEqual.equals(value, otherValue); // false |
| 16 | + * ``` |
| 17 | + * @category Comparator |
| 18 | + */ |
| 19 | + equals(this: void, left: T, right: T): boolean; |
| 20 | + /** |
| 21 | + * "Not equal to" operator |
| 22 | + * |
| 23 | + * @example |
| 24 | + * ```ts |
| 25 | + * const TEqual: Equal<T>; |
| 26 | + * TEqual['!='](value, otherValue); // true |
| 27 | + * TEqual['!='](value, value); // false |
| 28 | + * ``` |
| 29 | + * @category Comparator |
| 30 | + */ |
| 31 | + '!='(this: void, left: T, right: T): boolean; |
| 32 | + /** |
| 33 | + * "Equal to" operator |
| 34 | + * |
| 35 | + * @example |
| 36 | + * ```ts |
| 37 | + * type T = // ... |
| 38 | + * const TEqual: Equal<T>; |
| 39 | + * TEqual['=='](value, value); // true |
| 40 | + * TEqual['=='](value, otherValue); // false |
| 41 | + * ``` |
| 42 | + * @category Comparator |
| 43 | + */ |
| 44 | + '=='(this: void, left: T, right: T): boolean; |
| 45 | +} |
| 46 | + |
| 47 | +/** |
| 48 | + * Equal module constructor |
| 49 | + * |
| 50 | + * @example |
| 51 | + * ```ts |
| 52 | + * type T; |
| 53 | + * const TEqual = Equal<T>({ |
| 54 | + * '==': (left, right) => { /* ... *\/ }, |
| 55 | + * }); |
| 56 | + * const value: T; |
| 57 | + * |
| 58 | + * TEqual['=='](value, value); // true; |
| 59 | + * ``` |
| 60 | + * @category Functor |
| 61 | + */ |
| 62 | +export function Equal<T>(properties: { equals: (left: T, right: T) => boolean }): Equal<T> { |
| 63 | + const equals = (left: T, right: T) => properties.equals(left, right); |
| 64 | + const notEquals = (left: T, right: T) => !properties.equals(left, right); |
| 65 | + return { |
| 66 | + equals: properties.equals, |
| 67 | + '==': equals, |
| 68 | + '!=': notEquals, |
| 69 | + }; |
| 70 | +} |
| 71 | + |
| 72 | +/** |
| 73 | + * Module interface for values that have total order |
| 74 | + */ |
| 75 | +export interface Comparable<T> extends Equal<T> { |
| 76 | + /** |
| 77 | + * Return a number that represents comparison |
| 78 | + * |
| 79 | + * @example |
| 80 | + * ```ts |
| 81 | + * type T; |
| 82 | + * const TCompare: Comparable<T>; |
| 83 | + * const sorted = [3, 1, 1].sort(TCompare.compare); |
| 84 | + * ``` |
| 85 | + * @category Comparator |
| 86 | + */ |
| 87 | + compare(this: void, left: T, right: T): number; |
| 88 | + /** |
| 89 | + * "Less than or equal to" operator |
| 90 | + * |
| 91 | + * @example |
| 92 | + * ```ts |
| 93 | + * type T; |
| 94 | + * const TCompare: Comparable<T>; |
| 95 | + * const smallerT: T; |
| 96 | + * const greaterT: T; |
| 97 | + * TCompare['<='](smallerT, smallerT); // true |
| 98 | + * TCompare['<='](smallerT, greaterT); // true |
| 99 | + * TCompare['<='](greaterT, smallerT); // false |
| 100 | + * ``` |
| 101 | + * @category Comparator |
| 102 | + */ |
| 103 | + '<='(this: void, left: T, right: T): boolean; |
| 104 | + /** |
| 105 | + * "Less than" operator |
| 106 | + * |
| 107 | + * @example |
| 108 | + * ```ts |
| 109 | + * type T; |
| 110 | + * const TCompare: Comparable<T>; |
| 111 | + * const smallerT: T; |
| 112 | + * const greaterT: T; |
| 113 | + * TCompare['<'](smallerT, smallerT); // false |
| 114 | + * TCompare['<'](smallerT, greaterT); // true |
| 115 | + * TCompare['<'](greaterT, smallerT); // false |
| 116 | + * ``` |
| 117 | + * @category Comparator |
| 118 | + */ |
| 119 | + '<'(this: void, left: T, right: T): boolean; |
| 120 | + /** |
| 121 | + * "Greater than or equal to" operator |
| 122 | + * |
| 123 | + * @example |
| 124 | + * ```ts |
| 125 | + * type T; |
| 126 | + * const TCompare: Comparable<T>; |
| 127 | + * const smallerT: T; |
| 128 | + * const greaterT: T; |
| 129 | + * TCompare['>='](smallerT, smallerT); // true |
| 130 | + * TCompare['>='](smallerT, greaterT); // false |
| 131 | + * TCompare['>='](greaterT, smallerT); // true |
| 132 | + * ``` |
| 133 | + * @category Comparator |
| 134 | + */ |
| 135 | + '>='(this: void, left: T, right: T): boolean; |
| 136 | + /** |
| 137 | + * "Greater than" operator |
| 138 | + * |
| 139 | + * @example |
| 140 | + * ```ts |
| 141 | + * type T; |
| 142 | + * const TCompare: Comparable<T>; |
| 143 | + * const smallerT: T; |
| 144 | + * const greaterT: T; |
| 145 | + * TCompare['>'](smallerT, smallerT); // false |
| 146 | + * TCompare['>'](smallerT, greaterT); // false |
| 147 | + * TCompare['>'](greaterT, smallerT); // true |
| 148 | + * ``` |
| 149 | + * @category Comparator |
| 150 | + */ |
| 151 | + '>'(this: void, left: T, right: T): boolean; |
| 152 | + /** |
| 153 | + * "minimum" operator |
| 154 | + * |
| 155 | + * @example |
| 156 | + * ```ts |
| 157 | + * type T; |
| 158 | + * const TCompare: Comparable<T>; |
| 159 | + * const smallerT: T; |
| 160 | + * const greaterT: T; |
| 161 | + * TCompare.min(smallerT, greaterT); // smallerT |
| 162 | + * ``` |
| 163 | + * @category Comparator |
| 164 | + */ |
| 165 | + min(this: void, left: T, right: T): T; |
| 166 | + /** |
| 167 | + * "maximum" operator |
| 168 | + * |
| 169 | + * @example |
| 170 | + * ```ts |
| 171 | + * type T; |
| 172 | + * const TCompare: Comparable<T>; |
| 173 | + * const smallerT: T; |
| 174 | + * const greaterT: T; |
| 175 | + * TCompare.max(smallerT, greaterT); // greaterT |
| 176 | + * ``` |
| 177 | + * @category Comparator |
| 178 | + */ |
| 179 | + max(this: void, left: T, right: T): T; |
| 180 | +} |
| 181 | + |
| 182 | +/** |
| 183 | + * Construct Comparable instance |
| 184 | + * |
| 185 | + * @example |
| 186 | + * ```ts |
| 187 | + * const NumberComparable = Comparable({ |
| 188 | + * compare: (left, right) => left - right, |
| 189 | + * }); |
| 190 | + * NumberComparable['=='](0, 0); // true |
| 191 | + * NumberComparable['<'](0, 1); // true |
| 192 | + * NumberComparable['>'](0, 1); // false |
| 193 | + * ``` |
| 194 | + * @category Functor |
| 195 | + * @param properties |
| 196 | + * @param properties.compare - the comparison function |
| 197 | + */ |
| 198 | +export function Comparable<T>(properties: { |
| 199 | + compare: (left: T, right: T) => number; |
| 200 | +}): Comparable<T> { |
| 201 | + const { compare } = properties; |
| 202 | + const equals = (left: T, right: T) => compare(left, right) === 0; |
| 203 | + return { |
| 204 | + compare, |
| 205 | + equals, |
| 206 | + '==': equals, |
| 207 | + '!=': (left: T, right: T) => compare(left, right) !== 0, |
| 208 | + '<': (left: T, right: T) => compare(left, right) < 0, |
| 209 | + '<=': (left: T, right: T) => compare(left, right) <= 0, |
| 210 | + '>': (left: T, right: T) => compare(left, right) > 0, |
| 211 | + '>=': (left: T, right: T) => compare(left, right) >= 0, |
| 212 | + min: (left: T, right: T) => (compare(left, right) <= 0 ? left : right), |
| 213 | + max: (left: T, right: T) => (compare(left, right) > 0 ? left : right), |
| 214 | + }; |
| 215 | +} |
| 216 | + |
| 217 | +const BooleanComparable = Comparable<boolean>({ |
| 218 | + compare(left, right) { |
| 219 | + return left === right ? 0 : left < right ? -1 : 1; |
| 220 | + }, |
| 221 | +}); |
| 222 | + |
| 223 | +/** |
| 224 | + * A collection of functions to manipulate `boolean` |
| 225 | + * |
| 226 | + * @example |
| 227 | + * ```typescript |
| 228 | + * import { Boolean } from '@w5s/core'; |
| 229 | + * |
| 230 | + * if (Boolean.hasInstance(unknownValue)) { |
| 231 | + * // typeof unknownValue === 'boolean' |
| 232 | + * } |
| 233 | + * ``` |
| 234 | + * @namespace |
| 235 | + */ |
| 236 | +export const Boolean = { |
| 237 | + ...BooleanComparable, |
| 238 | + |
| 239 | + /** |
| 240 | + * Return true if `anyValue` is a `boolean` |
| 241 | + * |
| 242 | + * @example |
| 243 | + * ```typescript |
| 244 | + * Boolean.hasInstance(false) // true |
| 245 | + * Boolean.hasInstance(null)) // false |
| 246 | + * ``` |
| 247 | + * @category Guard |
| 248 | + * @param anyValue - a tested value |
| 249 | + */ |
| 250 | + hasInstance(anyValue: unknown): anyValue is boolean { |
| 251 | + return typeof anyValue === 'boolean'; |
| 252 | + }, |
| 253 | +}; |
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