localizer.tInfo = function()

in modules/core/localizer.js [243:344]
79 lines of code
24 McCabe index (conditional complexity)

    localizer.tInfo = function(origStringId, replacements, locale) {
        let stringId = origStringId.trim();

        let scopeId = 'general';

        if (stringId[0] === '_') {
            let split = stringId.split('.');
            scopeId = split[0].slice(1);
            stringId = split.slice(1).join('.');
        }

        locale = locale || _localeCode;

        let path = stringId
          .split('.')
          .map(s => s.replace(/<TX_DOT>/g, '.'))
          .reverse();

        let stringsKey = locale;
        // US English is the default
        if (stringsKey.toLowerCase() === 'en-us') stringsKey = 'en';
        let result = _localeStrings && _localeStrings[scopeId] && _localeStrings[scopeId][stringsKey];

        while (result !== undefined && path.length) {
          result = result[path.pop()];
        }

        if (result !== undefined) {
          if (replacements) {
            if (typeof result === 'object' && Object.keys(result).length) {
                // If plural forms are provided, dig one level deeper based on the
                // first numeric token replacement provided.
                const number = Object.values(replacements).find(function(value) {
                  return typeof value === 'number';
                });
                if (number !== undefined) {
                  const rule = pluralRule(number, locale);
                  if (result[rule]) {
                    result = result[rule];
                  } else {
                    // We're pretty sure this should be a plural but no string
                    // could be found for the given rule. Just pick the first
                    // string and hope it makes sense.
                    result = Object.values(result)[0];
                  }
                }
            }
            if (typeof result === 'string') {
              for (let key in replacements) {
                let value = replacements[key];
                if (typeof value === 'number') {
                  if (value.toLocaleString) {
                    // format numbers for the locale
                    value = value.toLocaleString(locale, {
                      style: 'decimal',
                      useGrouping: true,
                      minimumFractionDigits: 0
                    });
                  } else {
                    value = value.toString();
                  }
                }
                const token = `{${key}}`;
                const regex = new RegExp(token, 'g');
                result = result.replace(regex, value);
              }
            }
          }
          if (typeof result === 'string') {
            // found a localized string!
            return {
                text: result,
                locale: locale
            };
          }
        }
        // no localized string found...

        // attempt to fallback to a lower-priority language
        let index = _localeCodes.indexOf(locale);
        if (index >= 0 && index < _localeCodes.length - 1) {
            // eventually this will be 'en' or another locale with 100% coverage
            let fallback = _localeCodes[index + 1];
            return localizer.tInfo(origStringId, replacements, fallback);
        }

        if (replacements && 'default' in replacements) {
          // Fallback to a default value if one is specified in `replacements`
          return {
              text: replacements.default,
              locale: null
          };
        }

        const missing = `Missing ${locale} translation: ${origStringId}`;
        if (typeof console !== 'undefined') console.error(missing);  // eslint-disable-line

        return {
            text: missing,
            locale: 'en'
        };
    };