@thi.ng/soa/serialize.js

SOA & AOS memory mapped structured views with optional & extensible serialization

import { identity } from "@thi.ng/api/fn";
import { assert } from "@thi.ng/errors/assert";
import { utf8Decode, utf8Encode } from "@thi.ng/transducers-binary/utf8";
const ident = {
  decode: identity,
  encode: identity
};
const scalar = {
  decode: (v) => v[0],
  encode: (x) => [x]
};
const __toUTF8 = utf8Decode();
const utf8z = (maxLen) => ({
  decode: (v) => {
    let acc = "";
    const xf = __toUTF8([
      null,
      null,
      (_, x) => acc += x
    ])[2];
    for (let i = 0, n = v.length; i < n; i++) {
      const c = v[i];
      if (c === 0) break;
      xf(acc, c);
    }
    return acc;
  },
  encode: (v) => {
    const bytes = [...utf8Encode(v), 0];
    assert(bytes.length <= maxLen, `string too large: "${v}"`);
    return bytes;
  }
});
const serializer = (specs) => ({
  decode(tuple) {
    const res = {};
    for (const id in tuple) {
      res[id] = specs[id].decode(tuple[id]);
    }
    return res;
  },
  encode: (tuple) => {
    const res = {};
    for (const id in tuple) {
      res[id] = specs[id].encode(tuple[id]);
    }
    return res;
  }
});
export {
  ident,
  scalar,
  serializer,
  utf8z
};