Alex2Node/dist/esm/registry/schema.js

// Values checked at run time and typed at compile time. A descriptor states its property values, directive payloads
// and declaration options with these; parse() returns the value or throws a SchemaError that names where it went
// wrong. Written here rather than taken from a package: mqtt stays the only runtime dependency.
/** A value that does not fit its schema: path is where ("payload.targetSetpoint.scale"), problem is what. */
export class SchemaError extends Error {
    constructor(path, problem) {
        super(path ? `${path}: ${problem}` : problem);
        this.path = path;
        this.problem = problem;
        this.name = "SchemaError";
    }
}
// The input as an error message shows it: short, and quoted when it is text.
function shown(input) {
    if (input === undefined)
        return "nothing";
    if (typeof input === "function")
        return "a function";
    const text = JSON.stringify(input) ?? String(input);
    return text.length > 60 ? `${text.slice(0, 57)}...` : text;
}
/** The error of a value that is not what a schema expects. */
export function mismatch(path, expects, input) {
    return new SchemaError(path, `expected ${expects}, got ${shown(input)}`);
}
/** The path of a key of the object at path. */
export const at = (path, key) => (path ? `${path}.${key}` : key);
function isRecord(input) {
    return typeof input === "object" && input !== null && !Array.isArray(input);
}
function schema(expects, accepts) {
    return {
        expects,
        parse(input, path = "") {
            if (!accepts(input))
                throw mismatch(path, expects, input);
            return input;
        },
    };
}
function numberText({ min, max, gt, integer }) {
    const kind = integer ? "an integer" : "a number";
    if (min !== undefined && max !== undefined)
        return `${kind} from ${min} to ${max}`;
    if (min !== undefined)
        return `${kind} of ${min} or more`;
    if (max !== undefined)
        return `${kind} of ${max} or less`;
    if (gt !== undefined)
        return `${kind} greater than ${gt}`;
    return kind;
}
function number(rules = {}) {
    const { min = -Infinity, max = Infinity, gt = -Infinity, integer = false } = rules;
    return schema(numberText(rules), (input) => typeof input === "number" && Number.isFinite(input) && input >= min && input <= max && input > gt
        && (!integer || Number.isInteger(input)));
}
function string(rules = {}) {
    const { min = 0, max = Infinity, pattern } = rules;
    const length = max === Infinity ? (min > 0 ? ` of ${min} or more characters` : "") : ` of ${min} to ${max} characters`;
    return schema(rules.expects ?? `a string${length}`, (input) => typeof input === "string" && input.length >= min && input.length <= max && (!pattern || pattern.test(input)));
}
function boolean() {
    return schema("true or false", (input) => typeof input === "boolean");
}
function literal(value) {
    return schema(JSON.stringify(value), (input) => input === value);
}
function enumeration(...values) {
    return oneOf(values, values.join(" | "));
}
/** One of a list too long to print in an error message: expects says what the list is. */
function oneOf(values, expects) {
    return { ...schema(expects, (input) => values.includes(input)), values };
}
function unknown() {
    return schema("any value", () => true);
}
function optional(inner) {
    return {
        expects: inner.expects,
        optional: true,
        parse: (input, path = "") => (input === undefined ? undefined : inner.parse(input, path)),
    };
}
/** A value that is made when none is given: the time of an event, which is now unless the caller says when. */
function defaulted(inner, make) {
    return {
        expects: inner.expects,
        parse: (input, path = "") => (input === undefined ? make() : inner.parse(input, path)),
    };
}
function nullable(inner) {
    const expects = `${inner.expects} or null`;
    return {
        expects,
        parse(input, path = "") {
            if (input === null)
                return null;
            try {
                return inner.parse(input, path);
            }
            catch (err) {
                // The value itself is of the wrong kind: null was a choice too. An error further in keeps its own path.
                if (err instanceof SchemaError && err.path === path)
                    throw mismatch(path, expects, input);
                throw err;
            }
        },
    };
}
function array(item, rules = {}) {
    const { min = 0, max = Infinity } = rules;
    const count = max === Infinity ? (min > 0 ? ` with ${min} or more entries` : "") : ` with ${min} to ${max} entries`;
    const expects = `a list${count}`;
    return {
        expects,
        parse(input, path = "") {
            if (!Array.isArray(input) || input.length < min || input.length > max)
                throw mismatch(path, expects, input);
            return input.map((entry, i) => item.parse(entry, `${path}[${i}]`));
        },
    };
}
/**
 * An object with the keys of shape. Keys the shape does not name are kept as they are: a field Alexa adds to a
 * directive reaches the handler. unknownKeys "reject" is for what a developer writes, where such a key is a typo.
 */
function object(shape, rules = {}) {
    const known = Object.keys(shape);
    const expects = known.length > 0 ? `an object with ${known.join(", ")}` : "an object";
    return {
        expects,
        parse(input, path = "") {
            if (!isRecord(input))
                throw mismatch(path, expects, input);
            const others = Object.keys(input).filter((key) => !known.includes(key));
            if (others.length > 0 && rules.unknownKeys === "reject") {
                throw new SchemaError(at(path, others[0]), `unknown key, the known ones are ${known.join(", ") || "none"}`);
            }
            const parsed = {};
            for (const key of known) {
                const value = shape[key].parse(input[key], at(path, key));
                if (value !== undefined)
                    parsed[key] = value;
            }
            for (const key of others)
                parsed[key] = input[key];
            return parsed;
        },
    };
}
// alexa-property-schemas.html "Temperature", "Temperature scales"
function temperature() {
    return object({ value: number(), scale: enumeration("CELSIUS", "FAHRENHEIT", "KELVIN") });
}
// alexa-property-schemas.html "DateTime": UTC, no offsets. The seconds are optional here because the TimeInterval
// examples on the same page leave them out ("2017-10-04T14:00Z").
const DATE_TIME = /^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}(:\d{2}(\.\d+)?)?Z$/;
function dateTime() {
    return schema("a UTC time like 2017-08-30T01:18:21Z", (input) => typeof input === "string" && DATE_TIME.test(input) && !Number.isNaN(Date.parse(input)));
}
// alexa-property-schemas.html "Duration": the time portion of ISO 8601, negative for a delta ("PT-30S")
const DURATION = /^PT(?=.)(-?\d+H)?(-?\d+M)?(-?\d+S)?$/;
function duration() {
    return string({ pattern: DURATION, expects: "a duration like PT3M15S" });
}
// alexa-property-schemas.html "TimeInterval": "Specify one or two of the time interval fields. If you specify all
// three fields, an error occurs."
function timeInterval() {
    const fields = object({ start: optional(dateTime()), end: optional(dateTime()), duration: optional(duration()) });
    const expects = "a time interval with one or two of start, end, duration";
    return {
        expects,
        parse(input, path = "") {
            const interval = fields.parse(input, path);
            const given = [interval.start, interval.end, interval.duration].filter((field) => field !== undefined).length;
            if (given < 1 || given > 2)
                throw mismatch(path, expects, input);
            return interval;
        },
    };
}
export const s = {
    string,
    number,
    boolean,
    literal,
    enum: enumeration,
    oneOf,
    unknown,
    optional,
    defaulted,
    nullable,
    array,
    object,
    temperature,
    dateTime,
    duration,
    timeInterval,
};