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386 lines
10 KiB
TypeScript
386 lines
10 KiB
TypeScript
// Loaded from https://deno.land/x/cliffy@v0.18.0/flags/flags.ts
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import { getOption, paramCaseToCamelCase } from "./_utils.ts";
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import {
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ArgumentFollowsVariadicArgument,
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DuplicateOptionName,
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InvalidOptionValue,
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MissingOptionValue,
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RequiredArgumentFollowsOptionalArgument,
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UnknownConflictingOption,
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UnknownOption,
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UnknownRequiredOption,
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UnknownType,
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} from "./_errors.ts";
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import { normalize } from "./normalize.ts";
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import type {
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IFlagArgument,
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IFlagOptions,
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IFlagsResult,
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IParseOptions,
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ITypeHandler,
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} from "./types.ts";
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import { OptionType } from "./types.ts";
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import { boolean } from "./types/boolean.ts";
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import { number } from "./types/number.ts";
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import { string } from "./types/string.ts";
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import { validateFlags } from "./validate_flags.ts";
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const Types: Record<string, ITypeHandler<unknown>> = {
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[OptionType.STRING]: string,
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[OptionType.NUMBER]: number,
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[OptionType.BOOLEAN]: boolean,
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};
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/**
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* Parse command line arguments.
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* @param args Command line arguments e.g: `Deno.args`
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* @param opts Parse options.
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* ```
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* // example.ts -x 3 -y.z -n5 -abc --beep=boop foo bar baz --deno.land -- --cliffy
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* parseFlags(Deno.args);
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* ```
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* ```
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* {
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* flags: {
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* x: "3",
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* y: { z: true },
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* n: "5",
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* a: true,
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* b: true,
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* c: true,
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* beep: "boop",
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* deno: { land: true }
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* },
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* unknown: [ "foo", "bar", "baz" ],
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* literal: [ "--cliffy" ]
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* }
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* ```
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*/
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// deno-lint-ignore no-explicit-any
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export function parseFlags<O extends Record<string, any> = Record<string, any>>(
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args: string[],
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opts: IParseOptions = {},
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): IFlagsResult<O> {
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!opts.flags && (opts.flags = []);
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const normalized = normalize(args);
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let inLiteral = false;
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let negate = false;
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const flags: Record<string, unknown> = {};
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const optionNames: Record<string, string> = {};
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const literal: string[] = [];
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const unknown: string[] = [];
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let stopEarly = false;
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opts.flags.forEach((opt) => {
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opt.depends?.forEach((flag) => {
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if (!opts.flags || !getOption(opts.flags, flag)) {
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throw new UnknownRequiredOption(flag, opts.flags ?? []);
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}
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});
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opt.conflicts?.forEach((flag) => {
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if (!opts.flags || !getOption(opts.flags, flag)) {
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throw new UnknownConflictingOption(flag, opts.flags ?? []);
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}
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});
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});
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for (let i = 0; i < normalized.length; i++) {
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let option: IFlagOptions | undefined;
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let args: IFlagArgument[] | undefined;
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const current = normalized[i];
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// literal args after --
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if (inLiteral) {
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literal.push(current);
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continue;
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}
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if (current === "--") {
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inLiteral = true;
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continue;
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}
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const isFlag = current.length > 1 && current[0] === "-";
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const next = () => normalized[i + 1];
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if (isFlag && !stopEarly) {
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if (current[2] === "-" || (current[1] === "-" && current.length === 3)) {
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throw new UnknownOption(current, opts.flags);
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}
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negate = current.startsWith("--no-");
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option = getOption(opts.flags, current);
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// if (option && negate) {
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// const positiveName: string = current.replace(/^-+(no-)?/, "");
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// option = getOption(opts.flags, positiveName) ?? option;
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// }
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if (!option) {
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if (opts.flags.length) {
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throw new UnknownOption(current, opts.flags);
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}
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option = {
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name: current.replace(/^-+/, ""),
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optionalValue: true,
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type: OptionType.STRING,
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};
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}
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const positiveName: string = option.name.replace(/^no-?/, "");
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const propName: string = paramCaseToCamelCase(positiveName);
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if (typeof flags[propName] !== "undefined" && !option.collect) {
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throw new DuplicateOptionName(current);
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}
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args = option.args?.length ? option.args : [{
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type: option.type,
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requiredValue: option.requiredValue,
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optionalValue: option.optionalValue,
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variadic: option.variadic,
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list: option.list,
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separator: option.separator,
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}];
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let argIndex = 0;
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let inOptionalArg = false;
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const previous = flags[propName];
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parseNext(option, args);
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if (typeof flags[propName] === "undefined") {
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if (typeof option.default !== "undefined") {
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flags[propName] = typeof option.default === "function"
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? option.default()
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: option.default;
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} else if (args[argIndex].requiredValue) {
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throw new MissingOptionValue(option.name);
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} else {
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flags[propName] = true;
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}
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}
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if (typeof option.value !== "undefined") {
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flags[propName] = option.value(flags[propName], previous);
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} else if (option.collect) {
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const value: unknown[] = Array.isArray(previous) ? previous : [];
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value.push(flags[propName]);
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flags[propName] = value;
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}
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optionNames[propName] = option.name;
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opts.option?.(option, flags[propName]);
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/** Parse next argument for current option. */
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// deno-lint-ignore no-inner-declarations
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function parseNext(option: IFlagOptions, args: IFlagArgument[]): void {
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const arg: IFlagArgument = args[argIndex];
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if (!arg) {
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const flag = next();
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throw new UnknownOption(flag, opts.flags ?? []);
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}
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if (!arg.type) {
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arg.type = OptionType.BOOLEAN;
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}
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if (option.args?.length) {
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// make all value's required per default
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if (
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(typeof arg.optionalValue === "undefined" ||
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arg.optionalValue === false) &&
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typeof arg.requiredValue === "undefined"
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) {
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arg.requiredValue = true;
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}
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} else {
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// make non boolean value required per default
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if (
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arg.type !== OptionType.BOOLEAN &&
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(typeof arg.optionalValue === "undefined" ||
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arg.optionalValue === false) &&
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typeof arg.requiredValue === "undefined"
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) {
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arg.requiredValue = true;
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}
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}
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if (arg.requiredValue) {
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if (inOptionalArg) {
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throw new RequiredArgumentFollowsOptionalArgument(option.name);
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}
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} else {
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inOptionalArg = true;
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}
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if (negate) {
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flags[propName] = false;
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return;
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}
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let result: unknown;
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let increase = false;
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if (arg.list && hasNext(arg)) {
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const parsed: unknown[] = next()
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.split(arg.separator || ",")
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.map((nextValue: string) => {
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const value = parseValue(option, arg, nextValue);
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if (typeof value === "undefined") {
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throw new InvalidOptionValue(
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option.name,
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arg.type ?? "?",
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nextValue,
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);
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}
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return value;
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});
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if (parsed?.length) {
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result = parsed;
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}
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} else {
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if (hasNext(arg)) {
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result = parseValue(option, arg, next());
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} else if (arg.optionalValue && arg.type === OptionType.BOOLEAN) {
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result = true;
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}
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}
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if (increase) {
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i++;
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if (!arg.variadic) {
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argIndex++;
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} else if (args[argIndex + 1]) {
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throw new ArgumentFollowsVariadicArgument(next());
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}
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}
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if (
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typeof result !== "undefined" && ((args.length > 1) || arg.variadic)
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) {
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if (!flags[propName]) {
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flags[propName] = [];
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}
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(flags[propName] as Array<unknown>).push(result);
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if (hasNext(arg)) {
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parseNext(option, args);
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}
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} else {
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flags[propName] = result;
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}
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/** Check if current option should have an argument. */
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function hasNext(arg: IFlagArgument): boolean {
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return !!(
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normalized[i + 1] &&
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(arg.optionalValue || arg.requiredValue || arg.variadic) &&
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(normalized[i + 1][0] !== "-" ||
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(arg.type === OptionType.NUMBER &&
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!isNaN(Number(normalized[i + 1])))) &&
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arg
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);
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}
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/** Parse argument value. */
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function parseValue(
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option: IFlagOptions,
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arg: IFlagArgument,
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value: string,
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): unknown {
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const type: string = arg.type || OptionType.STRING;
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const result: unknown = opts.parse
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? opts.parse({
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label: "Option",
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type,
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name: `--${option.name}`,
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value,
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})
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: parseFlagValue(option, arg, value);
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if (typeof result !== "undefined") {
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increase = true;
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}
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return result;
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}
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}
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} else {
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if (opts.stopEarly) {
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stopEarly = true;
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}
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unknown.push(current);
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}
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}
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if (opts.flags && opts.flags.length) {
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validateFlags(
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opts.flags,
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flags,
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opts.knownFlaks,
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opts.allowEmpty,
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optionNames,
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);
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}
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// convert dotted option keys into nested objects
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const result = Object.keys(flags)
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.reduce((result: Record<string, unknown>, key: string) => {
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if (~key.indexOf(".")) {
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key.split(".").reduce(
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(
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// deno-lint-ignore no-explicit-any
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result: Record<string, any>,
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subKey: string,
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index: number,
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parts: string[],
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) => {
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if (index === parts.length - 1) {
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result[subKey] = flags[key];
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} else {
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result[subKey] = result[subKey] ?? {};
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}
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return result[subKey];
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},
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result,
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);
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} else {
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result[key] = flags[key];
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}
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return result;
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}, {});
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return { flags: result as O, unknown, literal };
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}
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function parseFlagValue(
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option: IFlagOptions,
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arg: IFlagArgument,
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value: string,
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): unknown {
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const type: string = arg.type || OptionType.STRING;
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const parseType = Types[type];
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if (!parseType) {
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throw new UnknownType(type, Object.keys(Types));
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}
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return parseType({
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label: "Option",
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type,
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name: `--${option.name}`,
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value,
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});
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}
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