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317 lines
8.3 KiB
TypeScript
317 lines
8.3 KiB
TypeScript
// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
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export interface ArgParsingOptions {
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unknown?: (i: unknown) => unknown;
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boolean?: boolean | string | string[];
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alias?: { [key: string]: string | string[] };
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string?: string | string[];
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default?: { [key: string]: unknown };
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"--"?: boolean;
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stopEarly?: boolean;
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}
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const DEFAULT_OPTIONS = {
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unknown: (i: unknown): unknown => i,
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boolean: false,
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alias: {},
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string: [],
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default: {},
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"--": false,
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stopEarly: false
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};
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interface Flags {
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bools: { [key: string]: boolean };
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strings: { [key: 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: { [s: 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 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(function(key: string): void {
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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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export function parse(
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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args: any[],
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initialOptions?: ArgParsingOptions
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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): { [key: string]: any } {
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const options: ArgParsingOptions = {
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...DEFAULT_OPTIONS,
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...(initialOptions || {})
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};
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const flags: Flags = {
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bools: {},
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strings: {},
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unknownFn: options.unknown!,
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allBools: false
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};
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if (options.boolean !== undefined) {
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if (typeof options.boolean === "boolean") {
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flags.allBools = !!options.boolean;
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} else {
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const booleanArgs: string[] =
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typeof options.boolean === "string"
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? [options.boolean]
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: options.boolean;
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booleanArgs.filter(Boolean).forEach((key: string): void => {
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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: { [key: string]: string[] } = {};
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if (options.alias !== undefined) {
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for (const key in options.alias) {
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const val = get(options.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 get(aliases, key)!) {
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aliases[alias] = [key].concat(
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aliases[key].filter((y: string): boolean => alias !== y)
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);
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}
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}
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}
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if (options.string !== undefined) {
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const stringArgs =
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typeof options.string === "string" ? [options.string] : options.string;
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stringArgs.filter(Boolean).forEach(function(key): void {
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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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alias.forEach((alias: string): void => {
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flags.strings[alias] = true;
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});
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}
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});
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}
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const defaults = options.default!;
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const argv: { [key: string]: unknown[] } = { _: [] };
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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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(get(aliases, key) || []).forEach(function(x): void {
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setKey(argv, x.split("."), value);
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});
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}
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function aliasIsBoolean(key: string): boolean {
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return get(aliases, key)!.some(function(x): boolean {
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return get(flags.bools, x)!;
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});
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}
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Object.keys(flags.bools).forEach(function(key): void {
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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.indexOf("--") !== -1) {
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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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// Using [\s\S] instead of . because js doesn't support the
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// 'dotall' regex modifier. See:
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// http://stackoverflow.com/a/1068308/13216
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const m = arg.match(/^--([^=]+)=([\s\S]*)$/)!;
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const key = m[1];
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const value = m[2];
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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 key = arg.match(/^--no-(.+)/)![1];
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setArg(key, false, arg);
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} else if (/^--.+/.test(arg)) {
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const key = arg.match(/^--(.+)/)![1];
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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)[0];
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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 (options.stopEarly) {
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argv._.push.apply(argv._, 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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Object.keys(defaults).forEach(function(key): void {
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if (!hasKey(argv, key.split("."))) {
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setKey(argv, key.split("."), defaults[key]);
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(aliases[key] || []).forEach(function(x): void {
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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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if (options["--"]) {
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argv["--"] = [];
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notFlags.forEach(function(key): void {
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argv["--"].push(key);
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});
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} else {
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notFlags.forEach(function(key): void {
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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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