1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 | 107x 1x 210x 1x 21x 213x 311x 184x 89x 69x 20x 12x 8x 12x 12x 78x 12x 78x 28x 12x 107x 107x 1x 27x 1x 167x 167x 152x 15x 15x 15x 1x 13x 1x 4x 1x 89x 89x 89x 89x 89x 89x 4x 85x 85x 85x 85x 523x 169x 169x 85x 85x 354x 85x 85x 85x 85x 85x 89x 89x 89x 406x 89x 406x 143x 143x 81x 263x 74x 189x 89x | import { curry, flow, without, includes, intersection, union, } from 'lodash/fp' function init() { return { items: emptyIterable(), selected: [], changed: { selected: [], deselected: [], }, anchor: null, } } const setItems = curry((items, state) => ({ items, selected: state.selected, changed: { selected: [], deselected: [], }, anchor: state.anchor, }) ) const setSelection = curry((selection, state) => ({ items: state.items, selected: selection, changed: { selected: without(state.selected, selection), deselected: without(selection, state.selected), }, anchor: state.anchor, }) ) function getSelection(state) { return state.selected } function getChangedSelection(state) { return state.changed.selected } function getChangedDeselection(state) { return state.changed.deselected } function getAnchor(state) { if (state.anchor !== null && state.anchor !== undefined) { return state.anchor } if (state.selected.length > 0) { return getBottommostSelectedItem(state) } return state.items[Symbol.iterator]().next().value } function getBottommostSelectedItem(state) { let previousItem = null const isSelected = (item) => state.selected.indexOf(item) !== -1 for (const item of state.items) { if (isSelected(item)) { previousItem = item } } return previousItem } function emptyIterable() { const array = [] return { [Symbol.iterator]: array[Symbol.iterator].bind(array), } } const replace = curry((selectedItem, state) => ({ items: state.items, selected: [selectedItem], changed: { selected: without(state.selected, [selectedItem]), deselected: without([selectedItem], state.selected), }, anchor: selectedItem, }) ) const toggle = curry((toggledItem, state) => { const itemIsAdded = !includes(toggledItem, state.selected) if (itemIsAdded) { return { items: state.items, selected: state.selected.concat([toggledItem]), changed: { selected: [toggledItem], deselected: [], }, anchor: toggledItem, } } const anchorIsRemoved = (toggledItem === state.anchor) const newAnchor = anchorIsRemoved ? null : state.anchor return { items: state.items, selected: without([toggledItem], state.selected), changed: { selected: [], deselected: [toggledItem], }, anchor: newAnchor, } }) const remove = curry((removedItem, state) => ({ items: state.items, selected: without(removedItem, state.selected), changed: { selected: [], deselected: intersection(removedItem, state.selected), }, anchor: null, }) ) const removeAll = curry((state) => ({ items: state.items, selected: [], changed: { selected: [], deselected: state.selected, }, anchor: null, }) ) const rangeTo = curry((toItem, state) => { const anchor = getAnchor(state, state.items) const connected = connectedWith(anchor, state.selected, state.items) const range = between(anchor, toItem, state.items) const selected = flow( without(connected), union(range) )(state.selected) return { items: state.items, selected, changed: { selected: without(state.selected, selected), deselected: without(selected, state.selected), }, anchor: state.anchor, } }) function between(start, end, iterable) { if (start === end) { return [start] } const result = [] let inRange = false let foundStartEnd = 0 for (const item of iterable) { if (inRange) { result.push(item) if ((item === start) || (item === end)) { foundStartEnd++ inRange = false } } else { if ((item === start) || (item === end)) { foundStartEnd++ inRange = true result.push(item) } } } Eif (foundStartEnd === 2) { return result } return [] } function connectedWith(targetItem, selected, iterable) { let range = [] let isRangeWithTargetItem = false const isSelected = (item) => selected.indexOf(item) !== -1 for (const item of iterable) { if (isSelected(item)) { range.push(item) if (item === targetItem) { isRangeWithTargetItem = true } } else { if (isRangeWithTargetItem) { break } else { range = [] } } } return range } export { init, setItems, setSelection, replace, toggle, remove, removeAll, rangeTo, getSelection, getChangedSelection, getChangedDeselection, } |