n class="nv">one</span> <span class="nv">of</span> <span class="nv">the</span> <span class="nv">characters</span> <span class="nv">in</span> <span class="nv">DELIMITERS</span>. <span class="nv">This</span> <span class="nv">routine</span> <span class="nv">consumes</span> <span class="nv">the</span>
<span class="nv">source_string</span> <span class="nv">one</span> <span class="nv">token</span> <span class="nv">per</span> <span class="nv">call</span>. <span class="nv">It</span> <span class="nv">returns</span> 