ecclesia/dist/election/voting.cjs

Framework for political and electoral simulations

"use strict";
var __create = Object.create;
var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __getProtoOf = Object.getPrototypeOf;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __export = (target, all) => {
  for (var name in all)
    __defProp(target, name, { get: all[name], enumerable: true });
};
var __copyProps = (to, from, except, desc) => {
  if (from && typeof from === "object" || typeof from === "function") {
    for (let key of __getOwnPropNames(from))
      if (!__hasOwnProp.call(to, key) && key !== except)
        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
  }
  return to;
};
var __toESM = (mod, isNodeMode, target) => (target = mod != null ? __create(__getProtoOf(mod)) : {}, __copyProps(
  // If the importer is in node compatibility mode or this is not an ESM
  // file that has been converted to a CommonJS file using a Babel-
  // compatible transform (i.e. "__esModule" has not been set), then set
  // "default" to the CommonJS "module.exports" for node compatibility.
  isNodeMode || !mod || !mod.__esModule ? __defProp(target, "default", { value: mod, enumerable: true }) : target,
  mod
));
var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);

// src/election/voting.ts
var voting_exports = {};
__export(voting_exports, {
  approvalVote: () => approvalVote,
  balancedCardinalVote: () => balancedCardinalVote,
  cardinalVote: () => cardinalVote,
  orderingVote: () => orderingVote,
  singleVote: () => singleVote,
  toShuffledVote: () => toShuffledVote
});
module.exports = __toCommonJS(voting_exports);
var import_python = require("@gouvernathor/python");
var import_collections = require("@gouvernathor/python/collections");

// src/utils.ts
var import_rng = __toESM(require("@gouvernathor/rng"), 1);
function createRandomObj({ randomObj, randomSeed } = {}) {
  if (randomObj === void 0) {
    randomObj = new import_rng.default(randomSeed);
  }
  return randomObj;
}

// src/election/ballots.ts
var Scores;
((Scores2) => {
  function get(key) {
    const value = this.get(key);
    if (value === void 0) {
      return Array(this.ngrades).fill(0);
    }
    return value;
  }
  function fromEntries(elements) {
    if (elements.length === 0) {
      throw new Error("Use the fromGrades method to create an empty Scores instance");
    }
    const ths = new Map(elements);
    ths.ngrades = elements[0][1].length;
    ths.get = get.bind(ths);
    return ths;
  }
  Scores2.fromEntries = fromEntries;
  function fromGrades(ngrades) {
    const ths = /* @__PURE__ */ new Map();
    ths.ngrades = ngrades;
    ths.get = get.bind(ths);
    return ths;
  }
  Scores2.fromGrades = fromGrades;
})(Scores || (Scores = {}));

// src/election/voting.ts
function toShuffledVote({ voting, ...rest }) {
  return (voters, candidates) => {
    const randomObj = createRandomObj(rest);
    const partees = randomObj.shuffled(candidates);
    return voting(voters, partees);
  };
}
function singleVote({ disagree }) {
  return (voters, candidates) => {
    const scores = import_collections.Counter.fromkeys(candidates, 0);
    for (const voter of voters) {
      scores.increment((0, import_python.min)(candidates, (party) => disagree(voter, party)));
    }
    return scores;
  };
}
function orderingVote({ disagree }) {
  return (voters, candidates) => {
    const order = [];
    for (const voter of voters) {
      order.push([...candidates].sort((a, b) => disagree(voter, a) - disagree(voter, b)));
    }
    return order;
  };
}
function cardinalVote({ nGrades, disagree }) {
  return (voters, candidates) => {
    const scores = Scores.fromGrades(nGrades);
    for (const voter of voters) {
      for (const party of candidates) {
        const grade = Math.min(
          nGrades - 1,
          Math.floor(nGrades) * (1 - disagree(voter, party))
        );
        scores.get(party)[grade]++;
      }
    }
    return scores;
  };
}
function balancedCardinalVote({ nGrades, disagree }) {
  return (voters, candidates) => {
    const scores = Scores.fromGrades(nGrades);
    for (const voter of voters) {
      const prefs = new Map(Array.from(candidates, (party) => [party, 1 - disagree(voter, party)]));
      const minPref = Math.min(...prefs.values());
      let maxPref = Math.max(...prefs.values());
      if (minPref !== maxPref) {
        maxPref -= minPref;
      }
      for (const party of candidates) {
        const grade = Math.min(
          nGrades - 1,
          Math.floor(nGrades * (prefs.get(party) - minPref) / maxPref)
        );
        scores.get(party)[grade]++;
      }
    }
    return scores;
  };
}
function approvalVote({ disagree }) {
  const cardinal = balancedCardinalVote({ nGrades: 2, disagree });
  return (voters, candidates) => {
    const scores = cardinal(voters, candidates);
    const approvals = new import_collections.Counter();
    for (const [party, [_disapproval, approval]] of scores) {
      approvals.increment(party, approval);
    }
    return approvals;
  };
}
// Annotate the CommonJS export names for ESM import in node:
0 && (module.exports = {
  approvalVote,
  balancedCardinalVote,
  cardinalVote,
  orderingVote,
  singleVote,
  toShuffledVote
});
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