superflected/src/humanize.ts

A port of ActiveSupport's inflector to Node.js

import { inflections } from "./Inflector";
import { cacheable } from "./cacheable";
export const humanize = cacheable(
  (lowerCaseAndUnderscoredWord: string, options?: { capitalize?: boolean }) => {
    let result = "" + lowerCaseAndUnderscoredWord;
    const inflector = inflections();
    const humans = inflector.humans;
    let human, rule, replacement;

    options = options || {};

    if (options.capitalize === null || options.capitalize === undefined) {
      options.capitalize = true;
    }

    for (let i = 0, ii = humans.length; i < ii; i++) {
      human = humans[i];
      rule = human[0];
      replacement = human[1];

      if (rule instanceof RegExp ? rule.test(result) : result.indexOf(rule) > -1) {
        result = result.replace(rule, replacement);
        break;
      }
    }

    result = result.replace(/_id$/, "");
    result = result.replace(/_/g, " ");

    result = result.replace(/([a-z\d]*)/gi, function (match) {
      return inflector.lowerToAcronyms[match] || match.toLowerCase();
    });

    if (options.capitalize) {
      result = result.replace(/^\w/, function (match) {
        return match.toUpperCase();
      });
    }

    return result;
  },
  (lowerCaseAndUnderscoredWord, options) => `${lowerCaseAndUnderscoredWord}-${options?.capitalize}`
);