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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import { deferred } from "../async/mod.ts";
import { fail } from "../testing/asserts.ts";
export type BinaryEncodings = "binary";
export type TextEncodings =
| "ascii"
| "utf8"
| "utf-8"
| "utf16le"
| "ucs2"
| "ucs-2"
| "base64"
| "latin1"
| "hex";
export type Encodings = BinaryEncodings | TextEncodings;
export function notImplemented(msg?: string): never {
const message = msg ? `Not implemented: ${msg}` : "Not implemented";
throw new Error(message);
}
export type _TextDecoder = typeof TextDecoder.prototype;
export const _TextDecoder = TextDecoder;
export type _TextEncoder = typeof TextEncoder.prototype;
export const _TextEncoder = TextEncoder;
// API helpers
export type MaybeNull<T> = T | null;
export type MaybeDefined<T> = T | undefined;
export type MaybeEmpty<T> = T | null | undefined;
export function intoCallbackAPI<T>(
// deno-lint-ignore no-explicit-any
func: (...args: any[]) => Promise<T>,
cb: MaybeEmpty<(err: MaybeNull<Error>, value: MaybeEmpty<T>) => void>,
// deno-lint-ignore no-explicit-any
...args: any[]
): void {
func(...args)
.then((value) => cb && cb(null, value))
.catch((err) => cb && cb(err, null));
}
export function intoCallbackAPIWithIntercept<T1, T2>(
// deno-lint-ignore no-explicit-any
func: (...args: any[]) => Promise<T1>,
interceptor: (v: T1) => T2,
cb: MaybeEmpty<(err: MaybeNull<Error>, value: MaybeEmpty<T2>) => void>,
// deno-lint-ignore no-explicit-any
...args: any[]
): void {
func(...args)
.then((value) => cb && cb(null, interceptor(value)))
.catch((err) => cb && cb(err, null));
}
export function spliceOne(list: string[], index: number): void {
for (; index + 1 < list.length; index++) list[index] = list[index + 1];
list.pop();
}
// Taken from: https://github.com/nodejs/node/blob/ba684805b6c0eded76e5cd89ee00328ac7a59365/lib/internal/util.js#L125
// Return undefined if there is no match.
// Move the "slow cases" to a separate function to make sure this function gets
// inlined properly. That prioritizes the common case.
export function normalizeEncoding(
enc: string | null,
): TextEncodings | undefined {
if (enc == null || enc === "utf8" || enc === "utf-8") return "utf8";
return slowCases(enc);
}
// https://github.com/nodejs/node/blob/ba684805b6c0eded76e5cd89ee00328ac7a59365/lib/internal/util.js#L130
function slowCases(enc: string): TextEncodings | undefined {
switch (enc.length) {
case 4:
if (enc === "UTF8") return "utf8";
if (enc === "ucs2" || enc === "UCS2") return "utf16le";
enc = `${enc}`.toLowerCase();
if (enc === "utf8") return "utf8";
if (enc === "ucs2") return "utf16le";
break;
case 3:
if (enc === "hex" || enc === "HEX" || `${enc}`.toLowerCase() === "hex") {
return "hex";
}
break;
case 5:
if (enc === "ascii") return "ascii";
if (enc === "ucs-2") return "utf16le";
if (enc === "UTF-8") return "utf8";
if (enc === "ASCII") return "ascii";
if (enc === "UCS-2") return "utf16le";
enc = `${enc}`.toLowerCase();
if (enc === "utf-8") return "utf8";
if (enc === "ascii") return "ascii";
if (enc === "ucs-2") return "utf16le";
break;
case 6:
if (enc === "base64") return "base64";
if (enc === "latin1" || enc === "binary") return "latin1";
if (enc === "BASE64") return "base64";
if (enc === "LATIN1" || enc === "BINARY") return "latin1";
enc = `${enc}`.toLowerCase();
if (enc === "base64") return "base64";
if (enc === "latin1" || enc === "binary") return "latin1";
break;
case 7:
if (
enc === "utf16le" ||
enc === "UTF16LE" ||
`${enc}`.toLowerCase() === "utf16le"
) {
return "utf16le";
}
break;
case 8:
if (
enc === "utf-16le" ||
enc === "UTF-16LE" ||
`${enc}`.toLowerCase() === "utf-16le"
) {
return "utf16le";
}
break;
default:
if (enc === "") return "utf8";
}
}
export function validateIntegerRange(
value: number,
name: string,
min = -2147483648,
max = 2147483647,
): void {
// The defaults for min and max correspond to the limits of 32-bit integers.
if (!Number.isInteger(value)) {
throw new Error(`${name} must be 'an integer' but was ${value}`);
}
if (value < min || value > max) {
throw new Error(
`${name} must be >= ${min} && <= ${max}. Value was ${value}`,
);
}
}
type OptionalSpread<T> = T extends undefined ? []
: [T];
export function once<T = undefined>(
callback: (...args: OptionalSpread<T>) => void,
) {
let called = false;
return function (this: unknown, ...args: OptionalSpread<T>) {
if (called) return;
called = true;
callback.apply(this, args);
};
}
/**
* @param {number} [expectedExecutions = 1]
* @param {number} [timeout = 1000] Milliseconds to wait before the promise is forcefully exited
*/
export function mustCall<T extends unknown[]>(
fn: ((...args: T) => void) = () => {},
expectedExecutions = 1,
timeout = 1000,
): [Promise<void>, (...args: T) => void] {
if (expectedExecutions < 1) {
throw new Error("Expected executions can't be lower than 1");
}
let timesExecuted = 0;
const completed = deferred();
const abort = setTimeout(() => completed.reject(), timeout);
function callback(this: unknown, ...args: T) {
timesExecuted++;
if (timesExecuted === expectedExecutions) {
completed.resolve();
}
fn.apply(this, args);
}
const result = completed
.then(() => clearTimeout(abort))
.catch(() =>
fail(
`Async operation not completed: Expected ${expectedExecutions}, executed ${timesExecuted}`,
)
);
return [
result,
callback,
];
}
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