public List extractMentionsOrListsWithIndices()

in java/src/main/java/com/twitter/twittertext/Extractor.java [236:273]

33 lines of code
9 McCabe index (conditional complexity)


  public List<Entity> extractMentionsOrListsWithIndices(String text) {
    if (isEmptyString(text)) {
      return Collections.emptyList();
    }

    // Performance optimization.
    // If text doesn't contain @/＠ at all, the text doesn't
    // contain @mention. So we can simply return an empty list.
    boolean found = false;
    for (char c : text.toCharArray()) {
      if (c == '@' || c == '＠') {
        found = true;
        break;
      }
    }
    if (!found) {
      return Collections.emptyList();
    }

    List<Entity> extracted = new ArrayList<Entity>();
    Matcher matcher = Regex.VALID_MENTION_OR_LIST.matcher(text);
    while (matcher.find()) {
      String after = text.substring(matcher.end());
      if (!Regex.INVALID_MENTION_MATCH_END.matcher(after).find()) {
        if (matcher.group(Regex.VALID_MENTION_OR_LIST_GROUP_LIST) == null) {
          extracted.add(new Entity(matcher, Entity.Type.MENTION,
              Regex.VALID_MENTION_OR_LIST_GROUP_USERNAME));
        } else {
          extracted.add(new Entity(matcher.start(Regex.VALID_MENTION_OR_LIST_GROUP_USERNAME) - 1,
              matcher.end(Regex.VALID_MENTION_OR_LIST_GROUP_LIST),
              matcher.group(Regex.VALID_MENTION_OR_LIST_GROUP_USERNAME),
              matcher.group(Regex.VALID_MENTION_OR_LIST_GROUP_LIST),
              Entity.Type.MENTION));
        }
      }
    }
    return extracted;
  }