int initFromParts()

in resources/src/main/java/org/robolectric/res/android/ConfigDescription.java [95:179]
67 lines of code
26 McCabe index (conditional complexity)

    int initFromParts(PeekingIterator<String> iter) {

      String part = iter.peek();
      if (part.startsWith("b+")) {
        // This is a "modified" BCP 47 language tag. Same semantics as BCP 47 tags,
        // except that the separator is "+" and not "-".
        String[] subtags = part.substring(2).toLowerCase().split("\\+", 0);
        if (subtags.length == 1) {
          set_language(subtags[0]);
        } else if (subtags.length == 2) {
          set_language(subtags[0]);

          // The second tag can either be a region, a variant or a script.
          switch (subtags[1].length()) {
            case 2:
            case 3:
              set_region(subtags[1]);
              break;
            case 4:
              if ('0' <= subtags[1].charAt(0) && subtags[1].charAt(0) <= '9') {
                // This is a variant: fall through
              } else {
                set_script(subtags[1]);
                break;
              }
              // fall through
            case 5:
            case 6:
            case 7:
            case 8:
              set_variant(subtags[1]);
              break;
            default:
              return -1;
          }
        } else if (subtags.length == 3) {
          // The language is always the first subtag.
          set_language(subtags[0]);

          // The second subtag can either be a script or a region code.
          // If its size is 4, it's a script code, else it's a region code.
          if (subtags[1].length() == 4) {
            set_script(subtags[1]);
          } else if (subtags[1].length() == 2 || subtags[1].length() == 3) {
            set_region(subtags[1]);
          } else {
            return -1;
          }

          // The third tag can either be a region code (if the second tag was
          // a script), else a variant code.
          if (subtags[2].length() >= 4) {
            set_variant(subtags[2]);
          } else {
            set_region(subtags[2]);
          }
        } else if (subtags.length == 4) {
          set_language(subtags[0]);
          set_script(subtags[1]);
          set_region(subtags[2]);
          set_variant(subtags[3]);
        } else {
          return -1;
        }

        iter.next();

      } else {
        if ((part.length() == 2 || part.length() == 3) && is_alpha(part) &&
            !Objects.equals(part, "car")) {
          set_language(part);
          iter.next();

          if (iter.hasNext()) {
            final String region_part = iter.peek();
            if (region_part.charAt(0) == 'r' && region_part.length() == 3) {
              set_region(region_part.substring(1));
              iter.next();
            }
          }
        }
      }

      return 0;
    }