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OrderedMap.js
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OrderedMap.js
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import { KeyedCollection } from './Collection';
import { IS_ORDERED_SYMBOL } from './predicates/isOrdered';
import { isOrderedMap } from './predicates/isOrderedMap';
import { Map, emptyMap } from './Map';
import { emptyList } from './List';
import { DELETE, NOT_SET, SIZE } from './TrieUtils';
import assertNotInfinite from './utils/assertNotInfinite';
export class OrderedMap extends Map {
// @pragma Construction
constructor(value) {
// eslint-disable-next-line no-constructor-return
return value === undefined || value === null
? emptyOrderedMap()
: isOrderedMap(value)
? value
: emptyOrderedMap().withMutations(map => {
const iter = KeyedCollection(value);
assertNotInfinite(iter.size);
iter.forEach((v, k) => map.set(k, v));
});
}
static of(/*...values*/) {
return this(arguments);
}
toString() {
return this.__toString('OrderedMap {', '}');
}
// @pragma Access
get(k, notSetValue) {
const index = this._map.get(k);
return index !== undefined ? this._list.get(index)[1] : notSetValue;
}
// @pragma Modification
clear() {
if (this.size === 0) {
return this;
}
if (this.__ownerID) {
this.size = 0;
this._map.clear();
this._list.clear();
this.__altered = true;
return this;
}
return emptyOrderedMap();
}
set(k, v) {
return updateOrderedMap(this, k, v);
}
remove(k) {
return updateOrderedMap(this, k, NOT_SET);
}
__iterate(fn, reverse) {
return this._list.__iterate(
entry => entry && fn(entry[1], entry[0], this),
reverse
);
}
__iterator(type, reverse) {
return this._list.fromEntrySeq().__iterator(type, reverse);
}
__ensureOwner(ownerID) {
if (ownerID === this.__ownerID) {
return this;
}
const newMap = this._map.__ensureOwner(ownerID);
const newList = this._list.__ensureOwner(ownerID);
if (!ownerID) {
if (this.size === 0) {
return emptyOrderedMap();
}
this.__ownerID = ownerID;
this.__altered = false;
this._map = newMap;
this._list = newList;
return this;
}
return makeOrderedMap(newMap, newList, ownerID, this.__hash);
}
}
OrderedMap.isOrderedMap = isOrderedMap;
OrderedMap.prototype[IS_ORDERED_SYMBOL] = true;
OrderedMap.prototype[DELETE] = OrderedMap.prototype.remove;
function makeOrderedMap(map, list, ownerID, hash) {
const omap = Object.create(OrderedMap.prototype);
omap.size = map ? map.size : 0;
omap._map = map;
omap._list = list;
omap.__ownerID = ownerID;
omap.__hash = hash;
omap.__altered = false;
return omap;
}
let EMPTY_ORDERED_MAP;
export function emptyOrderedMap() {
return (
EMPTY_ORDERED_MAP ||
(EMPTY_ORDERED_MAP = makeOrderedMap(emptyMap(), emptyList()))
);
}
function updateOrderedMap(omap, k, v) {
const map = omap._map;
const list = omap._list;
const i = map.get(k);
const has = i !== undefined;
let newMap;
let newList;
if (v === NOT_SET) {
// removed
if (!has) {
return omap;
}
if (list.size >= SIZE && list.size >= map.size * 2) {
newList = list.filter((entry, idx) => entry !== undefined && i !== idx);
newMap = newList
.toKeyedSeq()
.map(entry => entry[0])
.flip()
.toMap();
if (omap.__ownerID) {
newMap.__ownerID = newList.__ownerID = omap.__ownerID;
}
} else {
newMap = map.remove(k);
newList = i === list.size - 1 ? list.pop() : list.set(i, undefined);
}
} else if (has) {
if (v === list.get(i)[1]) {
return omap;
}
newMap = map;
newList = list.set(i, [k, v]);
} else {
newMap = map.set(k, list.size);
newList = list.set(list.size, [k, v]);
}
if (omap.__ownerID) {
omap.size = newMap.size;
omap._map = newMap;
omap._list = newList;
omap.__hash = undefined;
omap.__altered = true;
return omap;
}
return makeOrderedMap(newMap, newList);
}