73 lines
2.3 KiB
TypeScript
73 lines
2.3 KiB
TypeScript
import { embed, GenericEmbedded } from "./embedded";
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import { Bytes } from "./bytes";
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import { Record, Tuple } from "./record";
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import { Value } from "./values";
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import { Dictionary, Set } from "./dictionary";
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export function fromJS<T = GenericEmbedded>(x: any): Value<T> {
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switch (typeof x) {
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case 'number':
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if (!Number.isInteger(x)) {
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// We require that clients be explicit about integer vs. non-integer types.
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throw new TypeError("Refusing to autoconvert non-integer number to Single or Double");
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}
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// FALL THROUGH
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case 'bigint':
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case 'string':
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case 'symbol':
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case 'boolean':
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return x;
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case 'undefined':
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case 'function':
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break;
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case 'object':
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if (x === null) {
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break;
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}
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if (typeof x.__as_preserve__ === 'function') {
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return x.__as_preserve__();
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}
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if (Record.isRecord<Value<T>, Tuple<Value<T>>, T>(x)) {
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return x;
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}
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if (Array.isArray(x)) {
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return x.map<Value<T>>(fromJS);
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}
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if (ArrayBuffer.isView(x) || x instanceof ArrayBuffer) {
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return Bytes.from(x);
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}
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if (Map.isMap(x)) {
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const d = new Dictionary<T>();
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x.forEach((v, k) => d.set(fromJS(k), fromJS(v)));
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return d;
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}
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if (Set.isSet(x)) {
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const s = new Set<T>();
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x.forEach(v => s.add(fromJS(v)));
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return s;
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}
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// Just... assume it's a T.
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return embed(x as T);
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default:
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break;
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}
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throw new TypeError("Cannot represent JavaScript value as Preserves: " + x);
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}
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declare module "./dictionary" {
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namespace Dictionary {
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export function fromJS<T = GenericEmbedded, V = GenericEmbedded>(x: object): Dictionary<T, Value<V>>;
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}
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}
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Dictionary.fromJS = function <T = GenericEmbedded, V = GenericEmbedded>(x: object): Dictionary<T, Value<V>> {
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if (Dictionary.isDictionary<T, Value<V>>(x)) return x;
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const d = new Dictionary<T, Value<V>>();
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Object.entries(x).forEach(([key, value]) => d.set(key, fromJS(value)));
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return d;
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};
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