sync
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244
src/comparer/sync.ts
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244
src/comparer/sync.ts
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import { Converter } from "../types.js";
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import { Nullable } from "../utils.js";
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import { fromSync } from "./async.js";
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import { Comparer, ComparisonOrComparer, Comparison, AsyncComparer } from "./types.js";
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export function isComparer<T>(obj: any): obj is Comparer<T> {
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return obj instanceof BaseComparer;
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}
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export function asComparer<T>(comparer: ComparisonOrComparer<T>) {
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return typeof comparer === "function" ? createComparer(comparer) : comparer;
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}
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export function asComparison<T>(comparer: ComparisonOrComparer<T>) {
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return typeof comparer === "function" ? comparer : comparer.comparison();
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}
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export function createComparer<T>(comparison: Comparison<T>): Comparer<T> {
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return new SimpleComparer(comparison);
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}
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export function createComparerUsing<T, U>(projection: Converter<T, U>, comparison?: ComparisonOrComparer<U>): Comparer<T> {
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return new MappedComparer(projection, comparison);
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}
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export function reverseComparison<T>(comparison: Comparison<T>): Comparison<T> {
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return (a, b) => comparison(b, a);
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}
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export function combineNullableComparers<T>(comparers: Nullable<ComparisonOrComparer<T>>[]) {
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let result = defaultComparer;
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for (const comparer of comparers) {
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if (!comparer) {
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continue;
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}
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result = result.then(asComparer(comparer));
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}
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return result === defaultComparer ? undefined : result;
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}
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export abstract class BaseComparer<T> implements Comparer<T> {
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#cachedBoundComparison: Comparison<T> | undefined;
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public abstract compare(a: T, b: T): number;
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public comparison(): Comparison<T> {
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return this.#cachedBoundComparison ??= this.compare.bind(this);
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}
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public reverse(): Comparer<T> {
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return new ReversedComparer(this);
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}
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public then(comparer: Comparer<T>): Comparer<T> {
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return new ThenComparer(this, comparer);
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}
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public thenCompare(comparison: Comparison<T>): Comparer<T> {
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return this.then(createComparer(comparison));
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}
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public thenCompareUsing<U>(projection: Converter<T, U>, comparison?: ComparisonOrComparer<U>): Comparer<T> {
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return this.then(createComparerUsing(projection, comparison));
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}
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public toAsync(): AsyncComparer<T> {
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return fromSync<T>(this);
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}
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public nullAwareComparer(): Comparer<Nullable<T>> {
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return new NullAwareComparer(this);
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}
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}
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class SimpleComparer<T> extends BaseComparer<T> {
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readonly #comparison: Comparison<T>;
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public constructor(comparison: Comparison<T>) {
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super();
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this.#comparison = comparison;
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}
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public override compare(a: T, b: T) {
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return this.#comparison(a, b);
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}
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public override comparison() {
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return this.#comparison;
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}
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}
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class MappedComparer<T, U> extends BaseComparer<T> {
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readonly #projection: Converter<T, U>;
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readonly #comparison: Comparer<U>;
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public constructor(projection: Converter<T, U>, comparison?: ComparisonOrComparer<U>) {
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super();
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this.#projection = projection;
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this.#comparison = comparison ? asComparer(comparison) : defaultComparer;
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}
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public override compare(a: T, b: T) {
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return this.#comparison.compare(this.#projection(a), this.#projection(b));
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}
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}
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class ReversedComparer<T> extends BaseComparer<T> {
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readonly #base: Comparer<T>;
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public constructor(base: Comparer<T>) {
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super();
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this.#base = base;
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}
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public override compare(a: T, b: T): number {
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return this.#base.compare(b, a);
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}
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public override reverse(): Comparer<T> {
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return this.#base;
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}
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}
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class ThenComparer<T> extends BaseComparer<T> {
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readonly #base: Comparer<T>;
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readonly #comparer: Comparer<T>;
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public constructor(base: Comparer<T>, comparer: Comparer<T>) {
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super();
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this.#base = base;
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this.#comparer = comparer;
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}
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public override compare(a: T, b: T) {
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return this.#base.compare(a, b) || this.#comparer.compare(a, b);
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}
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}
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export const defaultComparer: Comparer<any> = new class DefaultComparer extends BaseComparer<any> {
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public override compare(a: any, b: any): number {
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if (a === undefined) {
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if (b === undefined) {
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return 0;
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}
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return 1;
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}
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if (b === undefined) {
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return -1;
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}
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const aStr = `${a}`, bStr = `${b}`;
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return aStr > bStr ? 1 : aStr < bStr ? -1 : 0;
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}
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};
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export function getDefaultComparer<T>(): Comparer<T> {
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return defaultComparer;
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}
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class NullAwareComparer<T> extends BaseComparer<Nullable<T>> {
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readonly #base: Comparer<T>;
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constructor(baseComparer: Comparer<T>) {
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super();
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this.#base = baseComparer;
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}
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public override compare(a: Nullable<T>, b: Nullable<T>): number {
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if (a === undefined) {
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if (b === undefined) {
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return 0;
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}
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return 1;
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}
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if (b === undefined) {
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return -1;
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}
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if (a === null) {
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if (b === null) {
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return 0;
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}
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return 1;
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}
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if (b === null) {
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return -1;
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}
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return this.#base.compare(a, b);
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}
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public override nullAwareComparer(): Comparer<Nullable<T>> {
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return this;
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}
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}
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export function nullAwareComparer<T>(baseComparer: Comparer<T>): Comparer<Nullable<T>> {
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return new NullAwareComparer(baseComparer);
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}
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export const stringComparer: Comparer<string> = new class StringComparer extends BaseComparer<string> {
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public override compare(a: string, b: string): number {
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return a.localeCompare(b);
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}
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};
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export const numberComparer: Comparer<number> = new class NumberComparer extends BaseComparer<number> {
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public override compare(a: number, b: number): number {
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return a - b;
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}
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};
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export const bigintComparer: Comparer<bigint> = new class BigIntComparer extends BaseComparer<bigint> {
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public override compare(a: bigint, b: bigint): number {
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return Number(a - b);
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}
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};
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export const booleanComparer: Comparer<boolean> = new class BooleanComparer extends BaseComparer<boolean> {
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public override compare(a: boolean, b: boolean): number {
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return Number(a) - Number(b);
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}
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};
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export const dateComparer: Comparer<Date> = new class DateComparer extends BaseComparer<Date> {
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public override compare(a: Date, b: Date): number {
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return a.getTime() - b.getTime();
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}
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};
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