novy-syndicate/src/transport/protocol.ts

import { Attenuation, toAttenuation } from '../gen/sturdy.js';
import * as IO from '../gen/protocol.js';
import { Assertion, Ref } from '../runtime/actor.js';
import { mapPointers } from '@preserves/core';
import { pointerNotAllowed } from './sturdy.js';

export type WireSymbol = { oid: IO.Oid, ref: Ref, count: number };

export type WireRef =
    | { loc: "mine", oid: IO.Oid }
    | { loc: "your", oid: IO.Oid, attenuation: Attenuation };

export function myRef(oid: IO.Oid): WireRef & { loc: "mine" } {
    return { loc: 'mine', oid };
}

export function yourRef(oid: IO.Oid, attenuation: Attenuation): WireRef & { loc: "your" } {
    return { loc: 'your', oid, attenuation };
}

export function toWireRef(v: IO._val): WireRef | undefined {
    if (Array.isArray(v) && v.length >= 2) {
        switch (v[0]) {
            case 0: {
                const oid = v[1];
                if (typeof oid === 'number') return myRef(oid);
                break;
            }
            case 1: {
                const oid = v[1];
                if (typeof oid === 'number') {
                    const attenuation = toAttenuation(mapPointers(v.slice(2), pointerNotAllowed) as Array<Assertion>);
                    if (attenuation !== void 0) return yourRef(oid, attenuation);
                }
                break;
            }
            default:
                break;
        }
    }
    return void 0;
}