/
validate_flags.ts
229 lines (205 loc) 路 6.13 KB
/
validate_flags.ts
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import { getDefaultValue, getOption, paramCaseToCamelCase } from "./_utils.ts";
import {
ConflictingOption,
DependingOption,
MissingOptionValue,
MissingRequiredOption,
OptionNotCombinable,
UnknownOption,
} from "./_errors.ts";
import { IFlagsResult, IParseOptions } from "./types.ts";
import type { IFlagArgument, IFlagOptions } from "./types.ts";
/**
* Flags post validation. Validations that are not already done by the parser.
*
* @param ctx Parse context.
* @param opts Parse options.
* @param options Option name mappings: propertyName -> option
*/
export function validateFlags<T extends IFlagOptions = IFlagOptions>(
ctx: IFlagsResult<Record<string, unknown>>,
opts: IParseOptions<T>,
options: Map<string, IFlagOptions> = new Map(),
): void {
if (!opts.flags) {
return;
}
const defaultValues = setDefaultValues(ctx, opts);
const optionNames = Object.keys(ctx.flags);
if (!optionNames.length && opts.allowEmpty) {
return;
}
if (ctx.standalone) {
validateStandaloneOption(
ctx,
options,
optionNames,
defaultValues,
);
return;
}
for (const [name, option] of options) {
validateUnknownOption(option, opts);
validateConflictingOptions(ctx, option);
validateDependingOptions(ctx, option, defaultValues);
validateRequiredValues(ctx, option, name);
}
validateRequiredOptions(ctx, options, opts);
}
function validateUnknownOption<T extends IFlagOptions = IFlagOptions>(
option: IFlagOptions,
opts: IParseOptions<T>,
) {
if (!getOption(opts.flags ?? [], option.name)) {
throw new UnknownOption(option.name, opts.flags ?? []);
}
}
/**
* Adds all default values to ctx.flags and returns a boolean object map with
* only the default option names `{ [OptionName: string]: boolean }`.
*/
function setDefaultValues<T extends IFlagOptions = IFlagOptions>(
ctx: IFlagsResult<Record<string, unknown>>,
opts: IParseOptions<T>,
) {
const defaultValues: Record<string, boolean> = {};
if (!opts.flags?.length) {
return defaultValues;
}
// Set default values
for (const option of opts.flags) {
let name: string | undefined;
let defaultValue: unknown = undefined;
// if --no-[flag] is present set --[flag] default value to true
if (option.name.startsWith("no-")) {
const propName = option.name.replace(/^no-/, "");
if (typeof ctx.flags[propName] !== "undefined") {
continue;
}
const positiveOption = getOption(opts.flags, propName);
if (positiveOption) {
continue;
}
name = paramCaseToCamelCase(propName);
defaultValue = true;
}
if (!name) {
name = paramCaseToCamelCase(option.name);
}
const hasDefaultValue: boolean = (!opts.ignoreDefaults ||
typeof opts.ignoreDefaults[name] === "undefined") &&
typeof ctx.flags[name] === "undefined" && (
typeof option.default !== "undefined" ||
typeof defaultValue !== "undefined"
);
if (hasDefaultValue) {
ctx.flags[name] = getDefaultValue(option) ?? defaultValue;
defaultValues[option.name] = true;
if (typeof option.value === "function") {
ctx.flags[name] = option.value(ctx.flags[name]);
}
}
}
return defaultValues;
}
function validateStandaloneOption(
ctx: IFlagsResult,
options: Map<string, IFlagOptions>,
optionNames: Array<string>,
defaultValues: Record<string, boolean>,
): void {
if (!ctx.standalone || optionNames.length === 1) {
return;
}
// Don't throw an error if all values are coming from the default option.
for (const [_, opt] of options) {
if (!defaultValues[opt.name] && opt !== ctx.standalone) {
throw new OptionNotCombinable(ctx.standalone.name);
}
}
}
function validateConflictingOptions(
ctx: IFlagsResult<Record<string, unknown>>,
option: IFlagOptions,
): void {
if (!option.conflicts?.length) {
return;
}
for (const flag of option.conflicts) {
if (isset(flag, ctx.flags)) {
throw new ConflictingOption(option.name, flag);
}
}
}
function validateDependingOptions(
ctx: IFlagsResult<Record<string, unknown>>,
option: IFlagOptions,
defaultValues: Record<string, boolean>,
): void {
if (!option.depends) {
return;
}
for (const flag of option.depends) {
// Don't throw an error if the value is coming from the default option.
if (!isset(flag, ctx.flags) && !defaultValues[option.name]) {
throw new DependingOption(option.name, flag);
}
}
}
function validateRequiredValues(
ctx: IFlagsResult<Record<string, unknown>>,
option: IFlagOptions,
name: string,
): void {
if (!option.args) {
return;
}
const isArray = option.args.length > 1;
for (let i = 0; i < option.args.length; i++) {
const arg: IFlagArgument = option.args[i];
if (!arg.requiredValue) {
continue;
}
const hasValue = isArray
? typeof (ctx.flags[name] as Array<unknown>)[i] !== "undefined"
: typeof ctx.flags[name] !== "undefined";
if (!hasValue) {
throw new MissingOptionValue(option.name);
}
}
}
function validateRequiredOptions<T extends IFlagOptions = IFlagOptions>(
ctx: IFlagsResult<Record<string, unknown>>,
options: Map<string, IFlagOptions>,
opts: IParseOptions<T>,
): void {
if (!opts.flags?.length) {
return;
}
const optionsValues = [...options.values()];
for (const option of opts.flags) {
if (!option.required || paramCaseToCamelCase(option.name) in ctx.flags) {
continue;
}
const conflicts = option.conflicts ?? [];
const hasConflict = conflicts.find((flag: string) => !!ctx.flags[flag]);
const hasConflicts = hasConflict ||
optionsValues.find((opt) =>
opt.conflicts?.find((flag: string) => flag === option.name)
);
if (hasConflicts) {
continue;
}
throw new MissingRequiredOption(option.name);
}
}
/**
* Check if value exists for flag.
* @param flagName Flag name.
* @param flags Parsed values.
*/
function isset(flagName: string, flags: Record<string, unknown>): boolean {
const name = paramCaseToCamelCase(flagName);
// return typeof values[ name ] !== 'undefined' && values[ name ] !== false;
return typeof flags[name] !== "undefined";
}