translate-maker/module/filters/plural.js

Lightweight translation module. Internationalize your great project.

import find from 'lodash/find';
import getPlural from '../utils/getPlural';

function getValue(data, key, defaultValue) {
  const items = data || [];
  const option = find(items, item => item.key === key);
  return option ? option.value : defaultValue;
}

export default function plural(value, part, attrs, metadata, ...args) {
  const {
    locale
  } = this.getOptions();
  const numberValue = Number(value);
  const currentPlural = getPlural(locale, 'en');
  const pluralValue = currentPlural(numberValue);
  const offset = getValue(metadata, 'offset', 0);
  const smartValue = offset ? numberValue - offset : value; // try to find exact value

  const exactKey = `=${numberValue}`;
  let option = null;
  let defaultOption = null;
  const exactOption = find(args, arg => {
    if (arg.type !== 'pair') {
      return false;
    }

    const key = typeof arg.key === 'string' ? arg.key.toLowerCase() : arg.key;

    if (!key || key === 'other') {
      defaultOption = arg;
    } else if (key === exactKey) {
      return true;
    } else if (key === pluralValue) {
      option = arg;
    }

    return undefined;
  });

  if (exactOption) {
    return this.buildText(exactOption.value, attrs, smartValue);
  } else if (option) {
    return this.buildText(option.value, attrs, smartValue);
  } else if (defaultOption) {
    return this.buildText(defaultOption.value, attrs, smartValue);
  }

  return undefined;
}
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