tuple.ts•2.06 kB
import { defineProperties } from "../../utils/properties.js";
import { Typed } from "../typed.js";
import { Coder } from "./abstract-coder.js";
import { pack, unpack } from "./array.js";
import type { Reader, Writer } from "./abstract-coder.js";
/**
* @_ignore
*/
export class TupleCoder extends Coder {
readonly coders!: ReadonlyArray<Coder>;
constructor(coders: Array<Coder>, localName: string) {
let dynamic = false;
const types: Array<string> = [];
coders.forEach((coder) => {
if (coder.dynamic) { dynamic = true; }
types.push(coder.type);
});
const type = ("tuple(" + types.join(",") + ")");
super("tuple", type, localName, dynamic);
defineProperties<TupleCoder>(this, { coders: Object.freeze(coders.slice()) });
}
defaultValue(): any {
const values: any = [ ];
this.coders.forEach((coder) => {
values.push(coder.defaultValue());
});
// We only output named properties for uniquely named coders
const uniqueNames = this.coders.reduce((accum, coder) => {
const name = coder.localName;
if (name) {
if (!accum[name]) { accum[name] = 0; }
accum[name]++;
}
return accum;
}, <{ [ name: string ]: number }>{ });
// Add named values
this.coders.forEach((coder: Coder, index: number) => {
let name = coder.localName;
if (!name || uniqueNames[name] !== 1) { return; }
if (name === "length") { name = "_length"; }
if (values[name] != null) { return; }
values[name] = values[index];
});
return Object.freeze(values);
}
encode(writer: Writer, _value: Array<any> | { [ name: string ]: any } | Typed): number {
const value = Typed.dereference(_value, "tuple");
return pack(writer, this.coders, value);
}
decode(reader: Reader): any {
return unpack(reader, this.coders);
}
}