mirror of
https://github.com/denoland/deno
synced 2024-10-14 03:52:29 +00:00
360 lines
9.6 KiB
TypeScript
360 lines
9.6 KiB
TypeScript
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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import { assert } from "../testing/asserts.ts";
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export interface Args {
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/** Contains all the arguments that didn't have an option associated with
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* them. */
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_: Array<string | number>;
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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[key: string]: any;
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}
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export interface ArgParsingOptions {
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/** When `true`, populate the result `_` with everything before the `--` and
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* the result `['--']` with everything after the `--`. Here's an example:
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*
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* const { args } = Deno;
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* import { parse } from "https://deno.land/std/flags/mod.ts";
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* // options['--'] is now set to false
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* console.dir(parse(args, { "--": false }));
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* // $ deno example.ts -- a arg1
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* // output: { _: [ "example.ts", "a", "arg1" ] }
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* // options['--'] is now set to true
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* console.dir(parse(args, { "--": true }));
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* // $ deno example.ts -- a arg1
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* // output: { _: [ "example.ts" ], --: [ "a", "arg1" ] }
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*
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* Defaults to `false`.
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*/
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"--"?: boolean;
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/** An object mapping string names to strings or arrays of string argument
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* names to use as aliases */
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alias?: Record<string, string | string[]>;
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/** A boolean, string or array of strings to always treat as booleans. If
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* `true` will treat all double hyphenated arguments without equal signs as
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* `boolean` (e.g. affects `--foo`, not `-f` or `--foo=bar`) */
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boolean?: boolean | string | string[];
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/** An object mapping string argument names to default values. */
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default?: Record<string, unknown>;
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/** When `true`, populate the result `_` with everything after the first
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* non-option. */
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stopEarly?: boolean;
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/** A string or array of strings argument names to always treat as strings. */
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string?: string | string[];
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/** A function which is invoked with a command line parameter not defined in
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* the `options` configuration object. If the function returns `false`, the
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* unknown option is not added to `parsedArgs`. */
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unknown?: (i: unknown) => unknown;
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}
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interface Flags {
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bools: Record<string, boolean>;
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strings: Record<string, boolean>;
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unknownFn: (i: unknown) => unknown;
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allBools: boolean;
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}
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interface NestedMapping {
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[key: string]: NestedMapping | unknown;
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}
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function get<T>(obj: Record<string, T>, key: string): T | undefined {
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if (Object.prototype.hasOwnProperty.call(obj, key)) {
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return obj[key];
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}
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}
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function getForce<T>(obj: Record<string, T>, key: string): T {
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const v = get(obj, key);
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assert(v != null);
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return v;
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}
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function isNumber(x: unknown): boolean {
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if (typeof x === "number") return true;
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if (/^0x[0-9a-f]+$/i.test(String(x))) return true;
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return /^[-+]?(?:\d+(?:\.\d*)?|\.\d+)(e[-+]?\d+)?$/.test(String(x));
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}
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function hasKey(obj: NestedMapping, keys: string[]): boolean {
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let o = obj;
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keys.slice(0, -1).forEach(key => {
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o = (get(o, key) ?? {}) as NestedMapping;
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});
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const key = keys[keys.length - 1];
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return key in o;
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}
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/** Take a set of command line arguments, with an optional set of options, and
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* return an object representation of those argument.
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*
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* const parsedArgs = parse(Deno.args);
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*/
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export function parse(
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args: string[],
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{
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"--": doubleDash = false,
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alias = {},
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boolean = false,
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default: defaults = {},
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stopEarly = false,
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string = [],
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unknown = (i: unknown): unknown => i
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}: ArgParsingOptions = {}
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): Args {
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const flags: Flags = {
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bools: {},
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strings: {},
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unknownFn: unknown,
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allBools: false
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};
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if (boolean !== undefined) {
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if (typeof boolean === "boolean") {
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flags.allBools = !!boolean;
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} else {
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const booleanArgs = typeof boolean === "string" ? [boolean] : boolean;
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for (const key of booleanArgs.filter(Boolean)) {
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flags.bools[key] = true;
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}
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}
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}
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const aliases: Record<string, string[]> = {};
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if (alias !== undefined) {
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for (const key in alias) {
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const val = getForce(alias, key);
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if (typeof val === "string") {
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aliases[key] = [val];
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} else {
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aliases[key] = val;
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}
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for (const alias of getForce(aliases, key)) {
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aliases[alias] = [key].concat(aliases[key].filter(y => alias !== y));
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}
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}
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}
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if (string !== undefined) {
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const stringArgs = typeof string === "string" ? [string] : string;
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for (const key of stringArgs.filter(Boolean)) {
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flags.strings[key] = true;
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const alias = get(aliases, key);
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if (alias) {
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for (const al of alias) {
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flags.strings[al] = true;
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}
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}
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}
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}
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const argv: Args = { _: [] };
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function argDefined(key: string, arg: string): boolean {
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return (
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(flags.allBools && /^--[^=]+$/.test(arg)) ||
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get(flags.bools, key) ||
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!!get(flags.strings, key) ||
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!!get(aliases, key)
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);
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}
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function setKey(obj: NestedMapping, keys: string[], value: unknown): void {
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let o = obj;
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keys.slice(0, -1).forEach(function(key): void {
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if (get(o, key) === undefined) {
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o[key] = {};
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}
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o = get(o, key) as NestedMapping;
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});
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const key = keys[keys.length - 1];
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if (
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get(o, key) === undefined ||
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get(flags.bools, key) ||
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typeof get(o, key) === "boolean"
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) {
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o[key] = value;
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} else if (Array.isArray(get(o, key))) {
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(o[key] as unknown[]).push(value);
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} else {
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o[key] = [get(o, key), value];
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}
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}
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function setArg(
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key: string,
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val: unknown,
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arg: string | undefined = undefined
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): void {
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if (arg && flags.unknownFn && !argDefined(key, arg)) {
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if (flags.unknownFn(arg) === false) return;
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}
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const value = !get(flags.strings, key) && isNumber(val) ? Number(val) : val;
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setKey(argv, key.split("."), value);
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const alias = get(aliases, key);
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if (alias) {
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for (const x of alias) {
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setKey(argv, x.split("."), value);
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}
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}
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}
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function aliasIsBoolean(key: string): boolean {
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return getForce(aliases, key).some(
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x => typeof get(flags.bools, x) === "boolean"
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);
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}
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for (const key of Object.keys(flags.bools)) {
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setArg(key, defaults[key] === undefined ? false : defaults[key]);
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}
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let notFlags: string[] = [];
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// all args after "--" are not parsed
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if (args.includes("--")) {
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notFlags = args.slice(args.indexOf("--") + 1);
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args = args.slice(0, args.indexOf("--"));
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}
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for (let i = 0; i < args.length; i++) {
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const arg = args[i];
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if (/^--.+=/.test(arg)) {
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const m = arg.match(/^--([^=]+)=(.*)$/s);
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assert(m != null);
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const [, key, value] = m;
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if (flags.bools[key]) {
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const booleanValue = value !== "false";
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setArg(key, booleanValue, arg);
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} else {
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setArg(key, value, arg);
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}
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} else if (/^--no-.+/.test(arg)) {
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const m = arg.match(/^--no-(.+)/);
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assert(m != null);
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setArg(m[1], false, arg);
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} else if (/^--.+/.test(arg)) {
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const m = arg.match(/^--(.+)/);
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assert(m != null);
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const [, key] = m;
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const next = args[i + 1];
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if (
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next !== undefined &&
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!/^-/.test(next) &&
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!get(flags.bools, key) &&
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!flags.allBools &&
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(get(aliases, key) ? !aliasIsBoolean(key) : true)
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) {
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setArg(key, next, arg);
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i++;
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} else if (/^(true|false)$/.test(next)) {
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setArg(key, next === "true", arg);
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i++;
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} else {
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setArg(key, get(flags.strings, key) ? "" : true, arg);
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}
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} else if (/^-[^-]+/.test(arg)) {
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const letters = arg.slice(1, -1).split("");
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let broken = false;
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for (let j = 0; j < letters.length; j++) {
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const next = arg.slice(j + 2);
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if (next === "-") {
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setArg(letters[j], next, arg);
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continue;
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}
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if (/[A-Za-z]/.test(letters[j]) && /=/.test(next)) {
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setArg(letters[j], next.split("=")[1], arg);
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broken = true;
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break;
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}
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if (
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/[A-Za-z]/.test(letters[j]) &&
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/-?\d+(\.\d*)?(e-?\d+)?$/.test(next)
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) {
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setArg(letters[j], next, arg);
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broken = true;
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break;
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}
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if (letters[j + 1] && letters[j + 1].match(/\W/)) {
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setArg(letters[j], arg.slice(j + 2), arg);
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broken = true;
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break;
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} else {
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setArg(letters[j], get(flags.strings, letters[j]) ? "" : true, arg);
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}
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}
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const [key] = arg.slice(-1);
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if (!broken && key !== "-") {
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if (
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args[i + 1] &&
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!/^(-|--)[^-]/.test(args[i + 1]) &&
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!get(flags.bools, key) &&
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(get(aliases, key) ? !aliasIsBoolean(key) : true)
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) {
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setArg(key, args[i + 1], arg);
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i++;
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} else if (args[i + 1] && /^(true|false)$/.test(args[i + 1])) {
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setArg(key, args[i + 1] === "true", arg);
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i++;
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} else {
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setArg(key, get(flags.strings, key) ? "" : true, arg);
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}
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}
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} else {
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if (!flags.unknownFn || flags.unknownFn(arg) !== false) {
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argv._.push(flags.strings["_"] ?? !isNumber(arg) ? arg : Number(arg));
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}
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if (stopEarly) {
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argv._.push(...args.slice(i + 1));
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break;
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}
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}
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}
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for (const key of Object.keys(defaults)) {
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if (!hasKey(argv, key.split("."))) {
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setKey(argv, key.split("."), defaults[key]);
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if (aliases[key]) {
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for (const x of aliases[key]) {
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setKey(argv, x.split("."), defaults[key]);
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}
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}
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}
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}
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if (doubleDash) {
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argv["--"] = [];
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for (const key of notFlags) {
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argv["--"].push(key);
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}
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} else {
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for (const key of notFlags) {
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argv._.push(key);
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}
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}
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return argv;
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}
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