/
datatypes.ts
189 lines (154 loc) · 4.41 KB
/
datatypes.ts
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import { Client, JSONValue, urls } from './index.js';
/** Each possible Atomic Datatype. See https://atomicdata.dev/collections/datatype */
// TODO: use strings from `./urls`, requires TS fix: https://github.com/microsoft/TypeScript/issues/40793
export enum Datatype {
/** A Resource - either a URL string or a Nested Resource */
ATOMIC_URL = 'https://atomicdata.dev/datatypes/atomicURL',
/** True / false */
BOOLEAN = 'https://atomicdata.dev/datatypes/boolean',
/** ISO date YYYY-MM-DD */
DATE = 'https://atomicdata.dev/datatypes/date',
/** Floating point number (number with comma) */
FLOAT = 'https://atomicdata.dev/datatypes/float',
INTEGER = 'https://atomicdata.dev/datatypes/integer',
/** UTF-8 Markdown string */
MARKDOWN = 'https://atomicdata.dev/datatypes/markdown',
/** Array of Resources and */
RESOURCEARRAY = 'https://atomicdata.dev/datatypes/resourceArray',
/** String with only letters, numbers and dashes in between */
SLUG = 'https://atomicdata.dev/datatypes/slug',
STRING = 'https://atomicdata.dev/datatypes/string',
/** Milliseconds since unix epoch */
TIMESTAMP = 'https://atomicdata.dev/datatypes/timestamp',
UNKNOWN = 'unknown-datatype',
}
/** Convert a URL to a Datatype */
export const datatypeFromUrl = (url: string): Datatype => {
switch (url) {
case urls.datatypes.atomicUrl: {
return Datatype.ATOMIC_URL;
}
case urls.datatypes.boolean: {
return Datatype.BOOLEAN;
}
case urls.datatypes.date: {
return Datatype.DATE;
}
case urls.datatypes.float: {
return Datatype.FLOAT;
}
case urls.datatypes.integer: {
return Datatype.INTEGER;
}
case urls.datatypes.markdown: {
return Datatype.MARKDOWN;
}
case urls.datatypes.resourceArray: {
return Datatype.RESOURCEARRAY;
}
case urls.datatypes.slug: {
return Datatype.SLUG;
}
case urls.datatypes.string: {
return Datatype.STRING;
}
case urls.datatypes.timestamp: {
return Datatype.TIMESTAMP;
}
default: {
return Datatype.UNKNOWN;
}
}
};
const slug_regex = /^[a-z0-9]+(?:-[a-z0-9]+)*$/;
// https://stackoverflow.com/a/22061879/2502163
const dateStringRegex = /^\d{4}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])$/;
export interface ArrayError extends Error {
index?: number;
}
/** Validates a JSON Value using a Datatype. Throws an error if things are wrong. */
export const validateDatatype = (
value: JSONValue,
datatype: Datatype,
): void => {
let err: null | string = null;
if (value === undefined) {
throw new Error(`Value is undefined, expected ${datatype}`);
}
switch (datatype) {
case Datatype.STRING: {
if (!isString(value)) {
err = 'Not a string';
break;
}
break;
}
case Datatype.SLUG: {
if (!isString(value)) {
err = 'Not a slug, not even a string';
break;
}
if (value.match(slug_regex) === null) {
err =
'Not a valid slug. Only lowercase letters and numbers with dashes `-` between them';
}
break;
}
case Datatype.ATOMIC_URL: {
if (!isString(value)) {
err = 'Not a string. Should be a URL';
break;
}
Client.tryValidSubject(value);
break;
}
case Datatype.RESOURCEARRAY: {
if (!isArray(value)) {
err = 'Not an array';
break;
}
value.map((item, index) => {
try {
Client.tryValidSubject(item);
} catch (e) {
const arrError: ArrayError = new Error(`Invalid URL`);
arrError.index = index;
throw arrError;
}
});
break;
}
case Datatype.INTEGER: {
if (!isNumber(value)) {
err = 'Not a number';
break;
}
if (value % 1 !== 0) {
err = 'Not an integer';
}
break;
}
case Datatype.DATE: {
if (!isString(value)) {
err = 'Not a string';
break;
}
if (value.match(dateStringRegex) === null) {
err = 'Not a date string: YYYY-MM-DD';
}
break;
}
}
if (err !== null) {
throw new Error(err);
}
};
export function isArray(val: JSONValue): val is [] {
return Object.prototype.toString.call(val) === '[object Array]';
}
export function isString(val: JSONValue): val is string {
return typeof val === 'string';
}
export function isNumber(val: JSONValue): val is number {
return typeof val === 'number';
}