/span> open(<span class="keyword">const</span> <span class="keywordtype">char</span>* arg) = 0;
<a name="l00168"></a>00168 
<a name="l00169"></a>00169   <span class="comment">// add str[] as tokens to the current context</span>
<a name="l00170"></a>00170   <span class="keyword">virtual</span> <span class="keywordtype">bool</span> add(<span class="keywordtype">size_t</span> size, <span class="keyword">const</span> <span class="keywordtype">char</span> **str) = 0;
<a name="l00171"></a>00171 
<a name="l00172">