scontainers/dist/types/object.js

A container/collection/iterator library for JavaScript, comfortable to use, performant and versatile.

"use strict";

function _implSymbol(target, sym, value) {
  Object.defineProperty(target, sym, {
    value,
    configurable: true
  });
  return target[sym];
}

function _getSymbol(targetSymName, ...traitSets) {
  let symbol;
  traitSets.forEach(traitSet => {
    const sym = traitSet[targetSymName];

    if (typeof sym === 'symbol') {
      if (!!symbol && symbol !== sym) {
        throw new Error(`Symbol ${targetSymName} offered by multiple trait sets.`);
      }

      symbol = sym;
    }
  });

  if (!symbol) {
    throw new Error(`No trait set is providing symbol ${targetSymName}.`);
  }

  return symbol;
}

function _testTraitSet(traitSet) {
  if (!traitSet || typeof traitSet === 'boolean' || typeof traitSet === 'number' || typeof traitSet === 'string') {
    throw new Error(`${traitSet} cannot be used as a trait set.`);
  }
}

const {
  assert,
  traits
} = require('../utils.js');

_testTraitSet(traits.utils);

_testTraitSet(traits.scontainers);

_testTraitSet(traits.semantics);

const _implScontainer = _getSymbol("implScontainer", traits.utils, traits.scontainers, traits.semantics);

const _forEach = _getSymbol("forEach", traits.utils, traits.scontainers, traits.semantics);

const _addTraitFactories = _getSymbol("addTraitFactories", traits.utils, traits.scontainers, traits.semantics);

const _wrapScontainer = _getSymbol("wrapScontainer", traits.utils, traits.scontainers, traits.semantics);

Object[_implScontainer]({
  from(collection) {
    // TODO: this function should be specialized, just like the rest of what this lib does...
    if (collection[_forEach]) {
      const object = {};

      collection[_forEach]((value, key) => void (object[key] = value));

      return object;
    }

    assert.fail();
  }

});

traits.scontainers[_addTraitFactories](Object.prototype, {
  ownProperties: Object[_wrapScontainer](require('./object_own_properties')),
  properties: Object[_wrapScontainer](require('./object_enumerable_properties'))
});