computed-types/lib/schema/switch.js

Runtime validation types for TypeScript.

"use strict";

exports.__esModule = true;
exports.findSwitchKey = findSwitchKey;
exports.generateSwitch = generateSwitch;

var _utils = require("./utils");

// exported functions
function findSwitchKey(...candidates) {
  const firstCandidate = candidates[0];

  if (candidates.length < 2 || typeof firstCandidate !== 'object' || firstCandidate === null) {
    return null;
  }

  let values = new Map();
  const switchKey = Object.keys(firstCandidate).find(key => {
    const firstValue = firstCandidate[key];

    if (!(0, _utils.isPrimitive)(firstValue)) {
      return false;
    }

    values = new Map([[firstValue, 0]]);

    for (let i = 1; i < candidates.length; i += 1) {
      const candidate = candidates[i];

      if (typeof candidate !== 'object' || candidate === null) {
        return false;
      }

      const value = candidate[key];

      if (!(0, _utils.isPrimitive)(value) || values.has(value)) {
        return false;
      }

      values.set(value, i);
    }

    return true;
  });

  if (switchKey === undefined) {
    return null;
  }

  return [switchKey, values];
}

function generateSwitch(switchKey, validators) {
  const [key, values] = switchKey;
  return (...args) => {
    const obj = args[0];
    let index;

    if (typeof obj === 'object' && obj !== null) {
      const value = obj[key];
      index = values.get(value) || 0;
    } else {
      index = 0;
    }

    return validators[index](...args);
  };
}
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