tupleson/lib/sync/serialize.mjs

A hackable JSON serializer/deserializer

import { TsonCircularReferenceError } from "../errors.js";
import { getDefaultNonce } from "../internals/getNonce.js";
import { mapOrReturn } from "../internals/mapOrReturn.js";
function getHandlers(opts) {
  const byPrimitive = {};
  const nonPrimitives = [];
  for (const handler of opts.types) {
    if (handler.primitive) {
      if (byPrimitive[handler.primitive]) {
        throw new Error(
          `Multiple handlers for primitive ${handler.primitive} found`
        );
      }
      byPrimitive[handler.primitive] = handler;
    } else {
      nonPrimitives.push(handler);
    }
  }
  const getNonce = opts.nonce ? opts.nonce : getDefaultNonce;
  return [getNonce, nonPrimitives, byPrimitive];
}
function createTsonStringify(opts) {
  const serializer = createTsonSerialize(opts);
  return (obj, space) => JSON.stringify(serializer(obj), null, space);
}
function createTsonSerialize(opts) {
  const [getNonce, nonPrimitive, byPrimitive] = getHandlers(opts);
  const walker = (nonce) => {
    const seen = /* @__PURE__ */ new WeakSet();
    const cache = /* @__PURE__ */ new WeakMap();
    const walk = (value) => {
      const type = typeof value;
      const isComplex = !!value && type === "object";
      if (isComplex) {
        if (seen.has(value)) {
          const cached = cache.get(value);
          if (!cached) {
            throw new TsonCircularReferenceError(value);
          }
          return cached;
        }
        seen.add(value);
      }
      const cacheAndReturn = (result) => {
        if (isComplex) {
          cache.set(value, result);
        }
        return result;
      };
      const primitiveHandler = byPrimitive[type];
      if (primitiveHandler && (!primitiveHandler.test || primitiveHandler.test(value))) {
        return cacheAndReturn([
          primitiveHandler.key,
          // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
          walk(primitiveHandler.serialize(value)),
          nonce
        ]);
      }
      for (const handler of nonPrimitive) {
        if (handler.test(value)) {
          return cacheAndReturn([
            handler.key,
            // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
            walk(handler.serialize(value)),
            nonce
          ]);
        }
      }
      return cacheAndReturn(mapOrReturn(value, walk));
    };
    return walk;
  };
  return (obj) => {
    const nonce = getNonce();
    const json = walker(nonce)(obj);
    return {
      json,
      nonce
    };
  };
}
export {
  createTsonSerialize,
  createTsonStringify
};
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