Example #1
0
  /*
   * BNF in RFC5646
   *
   * Language-Tag  = langtag             ; normal language tags
   *               / privateuse          ; private use tag
   *               / grandfathered       ; grandfathered tags
   *
   *
   * langtag       = language
   *                 ["-" script]
   *                 ["-" region]
   *                 *("-" variant)
   *                 *("-" extension)
   *                 ["-" privateuse]
   *
   * language      = 2*3ALPHA            ; shortest ISO 639 code
   *                 ["-" extlang]       ; sometimes followed by
   *                                     ; extended language subtags
   *               / 4ALPHA              ; or reserved for future use
   *               / 5*8ALPHA            ; or registered language subtag
   *
   * extlang       = 3ALPHA              ; selected ISO 639 codes
   *                 *2("-" 3ALPHA)      ; permanently reserved
   *
   * script        = 4ALPHA              ; ISO 15924 code
   *
   * region        = 2ALPHA              ; ISO 3166-1 code
   *               / 3DIGIT              ; UN M.49 code
   *
   * variant       = 5*8alphanum         ; registered variants
   *               / (DIGIT 3alphanum)
   *
   * extension     = singleton 1*("-" (2*8alphanum))
   *
   *                                     ; Single alphanumerics
   *                                     ; "x" reserved for private use
   * singleton     = DIGIT               ; 0 - 9
   *               / %x41-57             ; A - W
   *               / %x59-5A             ; Y - Z
   *               / %x61-77             ; a - w
   *               / %x79-7A             ; y - z
   *
   * privateuse    = "x" 1*("-" (1*8alphanum))
   *
   */
  public static LanguageTag parse(String languageTag, ParseStatus sts) {
    if (sts == null) {
      sts = new ParseStatus();
    } else {
      sts.reset();
    }

    StringTokenIterator itr;

    // Check if the tag is grandfathered
    String[] gfmap = GRANDFATHERED.get(LocaleUtils.toLowerString(languageTag));
    if (gfmap != null) {
      // use preferred mapping
      itr = new StringTokenIterator(gfmap[1], SEP);
    } else {
      itr = new StringTokenIterator(languageTag, SEP);
    }

    LanguageTag tag = new LanguageTag();

    // langtag must start with either language or privateuse
    if (tag.parseLanguage(itr, sts)) {
      tag.parseExtlangs(itr, sts);
      tag.parseScript(itr, sts);
      tag.parseRegion(itr, sts);
      tag.parseVariants(itr, sts);
      tag.parseExtensions(itr, sts);
    }
    tag.parsePrivateuse(itr, sts);

    if (!itr.isDone() && !sts.isError()) {
      String s = itr.current();
      sts.errorIndex = itr.currentStart();
      if (s.length() == 0) {
        sts.errorMsg = "Empty subtag";
      } else {
        sts.errorMsg = "Invalid subtag: " + s;
      }
    }

    return tag;
  }
Example #2
0
  private boolean parseExtensions(StringTokenIterator itr, ParseStatus sts) {
    if (itr.isDone() || sts.isError()) {
      return false;
    }

    boolean found = false;

    while (!itr.isDone()) {
      String s = itr.current();
      if (isExtensionSingleton(s)) {
        int start = itr.currentStart();
        String singleton = s;
        StringBuilder sb = new StringBuilder(singleton);

        itr.next();
        while (!itr.isDone()) {
          s = itr.current();
          if (isExtensionSubtag(s)) {
            sb.append(SEP).append(s);
            sts.parseLength = itr.currentEnd();
          } else {
            break;
          }
          itr.next();
        }

        if (sts.parseLength <= start) {
          sts.errorIndex = start;
          sts.errorMsg = "Incomplete extension '" + singleton + "'";
          break;
        }

        if (extensions.isEmpty()) {
          extensions = new ArrayList<>(4);
        }
        extensions.add(sb.toString());
        found = true;
      } else {
        break;
      }
    }
    return found;
  }
Example #3
0
  private boolean parsePrivateuse(StringTokenIterator itr, ParseStatus sts) {
    if (itr.isDone() || sts.isError()) {
      return false;
    }

    boolean found = false;

    String s = itr.current();
    if (isPrivateusePrefix(s)) {
      int start = itr.currentStart();
      StringBuilder sb = new StringBuilder(s);

      itr.next();
      while (!itr.isDone()) {
        s = itr.current();
        if (!isPrivateuseSubtag(s)) {
          break;
        }
        sb.append(SEP).append(s);
        sts.parseLength = itr.currentEnd();

        itr.next();
      }

      if (sts.parseLength <= start) {
        // need at least 1 private subtag
        sts.errorIndex = start;
        sts.errorMsg = "Incomplete privateuse";
      } else {
        privateuse = sb.toString();
        found = true;
      }
    }

    return found;
  }