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util.ts
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util.ts
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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
import { promisify } from "./_util/_util_promisify.ts";
import { callbackify } from "./_util/_util_callbackify.ts";
import { ERR_INVALID_ARG_TYPE, ERR_OUT_OF_RANGE, errorMap } from "./_errors.ts";
import * as types from "./_util/_util_types.ts";
export { callbackify, promisify, types };
const NumberIsSafeInteger = Number.isSafeInteger;
const DEFAULT_INSPECT_OPTIONS = {
showHidden: false,
depth: 2,
colors: false,
customInspect: true,
showProxy: false,
maxArrayLength: 100,
maxStringLength: Infinity,
breakLength: 80,
compact: 3,
sorted: false,
getters: false,
};
inspect.defaultOptions = DEFAULT_INSPECT_OPTIONS;
inspect.custom = Deno.customInspect;
// TODO(schwarzkopfb): make it in-line with Node's implementation
// Ref: https://nodejs.org/dist/latest-v14.x/docs/api/util.html#util_util_inspect_object_options
// deno-lint-ignore no-explicit-any
export function inspect(object: unknown, ...opts: any): string {
opts = { ...DEFAULT_INSPECT_OPTIONS, ...opts };
return Deno.inspect(object, {
depth: opts.depth,
iterableLimit: opts.maxArrayLength,
compact: !!opts.compact,
sorted: !!opts.sorted,
showProxy: !!opts.showProxy,
});
}
/** @deprecated - use `Array.isArray()` instead. */
export function isArray(value: unknown): boolean {
return Array.isArray(value);
}
/** @deprecated - use `typeof value === "boolean" || value instanceof Boolean` instead. */
export function isBoolean(value: unknown): boolean {
return typeof value === "boolean" || value instanceof Boolean;
}
/** @deprecated - use `value === null` instead. */
export function isNull(value: unknown): boolean {
return value === null;
}
/** @deprecated - use `value === null || value === undefined` instead. */
export function isNullOrUndefined(value: unknown): boolean {
return value === null || value === undefined;
}
/** @deprecated - use `typeof value === "number" || value instanceof Number` instead. */
export function isNumber(value: unknown): boolean {
return typeof value === "number" || value instanceof Number;
}
/** @deprecated - use `typeof value === "string" || value instanceof String` instead. */
export function isString(value: unknown): boolean {
return typeof value === "string" || value instanceof String;
}
/** @deprecated - use `typeof value === "symbol"` instead. */
export function isSymbol(value: unknown): boolean {
return typeof value === "symbol";
}
/** @deprecated - use `value === undefined` instead. */
export function isUndefined(value: unknown): boolean {
return value === undefined;
}
/** @deprecated - use `value !== null && typeof value === "object"` instead. */
export function isObject(value: unknown): boolean {
return value !== null && typeof value === "object";
}
/** @deprecated - use `e instanceof Error` instead. */
export function isError(e: unknown): boolean {
return e instanceof Error;
}
/** @deprecated - use `typeof value === "function"` instead. */
export function isFunction(value: unknown): boolean {
return typeof value === "function";
}
/** @deprecated - use `value instanceof RegExp` instead. */
export function isRegExp(value: unknown): boolean {
return value instanceof RegExp;
}
/** @deprecated - use `value === null || (typeof value !== "object" && typeof value !== "function")` instead. */
export function isPrimitive(value: unknown): boolean {
return (
value === null || (typeof value !== "object" && typeof value !== "function")
);
}
/**
* Returns a system error name from an error code number.
* @param code error code number
*/
export function getSystemErrorName(code: number): string | undefined {
if (typeof code !== "number") {
throw new ERR_INVALID_ARG_TYPE("err", "number", code);
}
if (code >= 0 || !NumberIsSafeInteger(code)) {
throw new ERR_OUT_OF_RANGE("err", "a negative integer", code);
}
return errorMap.get(code)?.[0];
}
/**
* https://nodejs.org/api/util.html#util_util_deprecate_fn_msg_code
* @param _code This implementation of deprecate won't apply the deprecation code
*/
// deno-lint-ignore no-explicit-any
export function deprecate<T extends (...args: any) => any>(
fn: T,
msg: string,
_code?: string,
): (...args: Parameters<T>) => ReturnType<T> {
return function (...args) {
console.warn(msg);
return fn.apply(undefined, args);
};
}
function circularRemover(): (key: string, value: unknown) => unknown {
const seen = new WeakSet();
return (_key, value) => {
if (typeof value === "object" && value !== null) {
if (seen.has(value)) {
return;
}
seen.add(value);
}
return value;
};
}
function formatString(str: string) {
return `"${str.replace(/\\/, "\\\\").replace(/"/g, '\\"')}"`;
}
function thingToString(
thing: unknown,
maxDepth?: number,
depth = 1,
): string {
let result = "";
if (typeof thing === "bigint") {
return thing + "n";
}
if (
typeof thing === "undefined" || typeof thing === "number" ||
typeof thing === "boolean" || typeof thing === "symbol" || thing === null
) {
return String(thing);
}
if (typeof thing === "function") {
return `[Function ${thing.name || "(anonymous)"}]`;
}
if (typeof thing === "string") {
return formatString(thing);
}
if (Array.isArray(thing)) {
if (depth === maxDepth) {
return "[Array]";
}
result += "[";
const en = Object.entries(thing);
for (let i = 0; i < en.length; i++) {
const [key, value] = en[i];
if (isNaN(Number(key))) {
result += `${key}: `;
}
result += thingToString(value, maxDepth, depth + 1);
if (i !== en.length - 1) {
result += ", ";
}
}
result += "]";
return result;
}
if (depth === maxDepth) {
return "[Object]";
}
const en = Object.entries(thing as Record<string, unknown>);
result += "{ ";
for (let i = 0; i < en.length; i++) {
const [key, value] = en[i];
result += `${key}: ${thingToString(value, maxDepth, depth + 1)}`;
if (i !== en.length - 1) {
result += ", ";
}
}
result += " }";
return result;
}
function toReplace(specifier: string, value: unknown): string {
if (specifier === "%s") {
return thingToString(value, 2);
}
if (specifier === "%d") {
if (typeof value === "bigint") {
return value + "n";
}
return Number(value).toString();
}
if (specifier === "%i") {
if (typeof value === "bigint") {
return value + "n";
}
return parseInt(value as string).toString();
}
if (specifier === "%f") {
return parseFloat(value as string).toString();
}
if (specifier === "%j") {
return JSON.stringify(value, circularRemover());
}
if (specifier === "%o" || specifier === "%O") {
return thingToString(value);
}
if (specifier === "%c") {
return "";
}
return "";
}
export function format(input: string, ...args: unknown[]) {
const replacement: [number, string][] = [];
const regex = /%(s|d|i|f|j|o|O|c)/g;
let i = 0;
let arr: RegExpExecArray | null = null;
while ((arr = regex.exec(input)) !== null && i < args.length) {
replacement.push([arr["index"], toReplace(arr[0], args[i])]);
i++;
}
let result = "";
let last = 0;
for (let i = 0; i < replacement.length; i++) {
const item = replacement[i];
result += input.slice(last, item[0]);
result += item[1];
last = item[0] + 2;
}
result += input.slice(last);
return result;
}
import { _TextDecoder, _TextEncoder } from "./_utils.ts";
/** The global TextDecoder */
export type TextDecoder = import("./_utils.ts")._TextDecoder;
export const TextDecoder = _TextDecoder;
/** The global TextEncoder */
export type TextEncoder = import("./_utils.ts")._TextEncoder;
export const TextEncoder = _TextEncoder;
export default {
inspect,
isArray,
isBoolean,
isNull,
isNullOrUndefined,
isNumber,
isString,
isSymbol,
isUndefined,
isObject,
isError,
isFunction,
isRegExp,
isPrimitive,
getSystemErrorName,
deprecate,
callbackify,
promisify,
types,
TextDecoder,
TextEncoder,
};