Ejemplo n.º 1
0
  /** Return true if the content model could match an empty input stream. */
  public boolean empty() {
    switch (type) {
      case '*':
      case '?':
        return true;

      case '+':
      case '|':
        for (ContentModel m = (ContentModel) content; m != null; m = m.next) {
          if (m.empty()) {
            return true;
          }
        }
        return false;

      case ',':
      case '&':
        for (ContentModel m = (ContentModel) content; m != null; m = m.next) {
          if (!m.empty()) {
            return false;
          }
        }
        return true;

      default:
        return false;
    }
  }
Ejemplo n.º 2
0
  /** Return true if the token could potentially be the first token in the input stream. */
  public boolean first(Object token) {
    switch (type) {
      case '*':
      case '?':
      case '+':
        return ((ContentModel) content).first(token);

      case ',':
        for (ContentModel m = (ContentModel) content; m != null; m = m.next) {
          if (m.first(token)) {
            return true;
          }
          if (!m.empty()) {
            return false;
          }
        }
        return false;

      case '|':
      case '&':
        {
          Element e = (Element) token;
          if (valSet == null) {
            valSet = new boolean[Element.maxIndex + 1];
            val = new boolean[Element.maxIndex + 1];
            // All Element instances are created before this ever executes
          }
          if (valSet[e.index]) {
            return val[e.index];
          }
          for (ContentModel m = (ContentModel) content; m != null; m = m.next) {
            if (m.first(token)) {
              val[e.index] = true;
              break;
            }
          }
          valSet[e.index] = true;
          return val[e.index];
        }

      default:
        return (content == token);
        // PENDING: refer to comment in ContentModelState
        /*
                      if (content == token) {
                          return true;
                      }
                      Element e = (Element)content;
                      if (e.omitStart() && e.content != null) {
                          return e.content.first(token);
                      }
                      return false;
        */
    }
  }
Ejemplo n.º 3
0
 /** Update elemVec with the list of elements that are part of the this contentModel. */
 public void getElements(Vector<Element> elemVec) {
   switch (type) {
     case '*':
     case '?':
     case '+':
       ((ContentModel) content).getElements(elemVec);
       break;
     case ',':
     case '|':
     case '&':
       for (ContentModel m = (ContentModel) content; m != null; m = m.next) {
         m.getElements(elemVec);
       }
       break;
     default:
       elemVec.addElement((Element) content);
   }
 }