code: public final String entryRuleOpAdd() throws RecognitionException {
          String current = null;
  
          AntlrDatatypeRuleToken iv_ruleOpAdd = null;
  
  
          try {
              // InternalPureXbase.g:1847:45: (iv_ruleOpAdd= ruleOpAdd EOF )
              // InternalPureXbase.g:1848:2: iv_ruleOpAdd= ruleOpAdd EOF
              {
              if ( state.backtracking==0 ) {
                 newCompositeNode(grammarAccess.getOpAddRule()); 
              }
              pushFollow(FOLLOW_1);
              iv_ruleOpAdd=ruleOpAdd();
  
              state._fsp--;
              if (state.failed) return current;
              if ( state.backtracking==0 ) {
                 current =iv_ruleOpAdd.getText(); 
              }
              match(input,EOF,FOLLOW_2); if (state.failed) return current;
  
              }
  
          }
  
              catch (RecognitionException re) {
                  recover(input,re);
                  appendSkippedTokens();
              }
          finally {
          }
          return current;
      }
docs: InternalPureXbase.g:1847:1: entryRuleOpAdd returns [String current=null] : iv_ruleOpAdd= ruleOpAdd EOF ;