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function-validation-bug

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Map.ts

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export class Map<K extends AnyNotNil, V> {

public static [Symbol.species] = Map;

public [Symbol.toStringTag] = "Map";

private items = new LuaTable<K, V>();

public size = 0;

// Key-order variables

private firstKey: K | undefined;

private lastKey: K | undefined;

private nextKey = new LuaTable<K, K>();

private previousKey = new LuaTable<K, K>();

constructor(entries?: Iterable<readonly [K, V]> | Array<readonly [K, V]>) {

if (entries === undefined) return;

const iterable = entries as Iterable<[K, V]>;

if (iterable[Symbol.iterator]) {

// Iterate manually because Map is compiled with ES5 which doesn't support Iterables in for...of

const iterator = iterable[Symbol.iterator]();

while (true) {

const result = iterator.next();

if (result.done) {

break;

}

const value: [K, V] = result.value; // Ensures index is offset when tuple is accessed

this.set(value[0], value[1]);

}

} else {

const array = entries as Array<[K, V]>;

for (const kvp of array) {

this.set(kvp[0], kvp[1]);

}

}

}

public clear(): void {

this.items = new LuaTable();

this.nextKey = new LuaTable();

this.previousKey = new LuaTable();

this.firstKey = undefined;

this.lastKey = undefined;

this.size = 0;

}

public delete(key: K): boolean {

const contains = this.has(key);

if (contains) {

this.size--;

// Do order bookkeeping

const next = this.nextKey.get(key);

const previous = this.previousKey.get(key);

if (next !== undefined && previous !== undefined) {

this.nextKey.set(previous, next);

this.previousKey.set(next, previous);

} else if (next !== undefined) {

this.firstKey = next;

this.previousKey.set(next, undefined!);

} else if (previous !== undefined) {

this.lastKey = previous;

this.nextKey.set(previous, undefined!);

} else {

this.firstKey = undefined;

this.lastKey = undefined;

}

this.nextKey.set(key, undefined!);

this.previousKey.set(key, undefined!);

}

this.items.set(key, undefined!);

return contains;

}

public forEach(callback: (value: V, key: K, map: Map<K, V>) => any): void {

for (const key of this.keys()) {

callback(this.items.get(key), key, this);

}

}

public get(key: K): V | undefined {

return this.items.get(key);

}

public has(key: K): boolean {

return this.nextKey.get(key) !== undefined || this.lastKey === key;

}

public set(key: K, value: V): this {

const isNewValue = !this.has(key);

if (isNewValue) {

this.size++;

}

this.items.set(key, value);

// Do order bookkeeping

if (this.firstKey === undefined) {

this.firstKey = key;

this.lastKey = key;

} else if (isNewValue) {

this.nextKey.set(this.lastKey!, key);

this.previousKey.set(key, this.lastKey!);

this.lastKey = key;

}

return this;

}

public [Symbol.iterator](): IterableIterator<[K, V]> {

return this.entries();

}

public entries(): IterableIterator<[K, V]> {

const { items, nextKey } = this;

let key = this.firstKey;

return {

[Symbol.iterator](): IterableIterator<[K, V]> {

return this;

},

next(): IteratorResult<[K, V]> {

const result = { done: !key, value: [key, items.get(key!)] as [K, V] };

key = nextKey.get(key!);

return result;

},

};

}

public keys(): IterableIterator<K> {

const nextKey = this.nextKey;

let key = this.firstKey;

return {

[Symbol.iterator](): IterableIterator<K> {

return this;

},

next(): IteratorResult<K> {

const result = { done: !key, value: key };

key = nextKey.get(key!);

return result as IteratorResult<K>;

},

};

}

public values(): IterableIterator<V> {

const { items, nextKey } = this;

let key = this.firstKey;

return {

[Symbol.iterator](): IterableIterator<V> {

return this;

},

next(): IteratorResult<V> {

const result = { done: !key, value: items.get(key!) };

key = nextKey.get(key!);

return result;

},

};

}

}