RosettaCodeData/Task/Tree-from-nesting-levels/Phix/tree-from-nesting-levels-2.phix

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 <span style="color: #008080;">function</span> <span style="color: #000000;">nest</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">input</span><span style="color: #0000FF;">)</span>
     <span style="color: #008080;">if</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">input</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">then</span>
         <span style="color: #008080;">for</span> <span style="color: #000000;">level</span><span style="color: #0000FF;">=</span><span style="color: #7060A8;">max</span><span style="color: #0000FF;">(</span><span style="color: #000000;">input</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">to</span> <span style="color: #000000;">2</span> <span style="color: #008080;">by</span> <span style="color: #0000FF;">-</span><span style="color: #000000;">1</span> <span style="color: #008080;">do</span>
             <span style="color: #004080;">sequence</span> <span style="color: #000000;">output</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{}</span>
             <span style="color: #004080;">bool</span> <span style="color: #000000;">subnest</span> <span style="color: #0000FF;">=</span> <span style="color: #004600;">false</span>
             <span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">input</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span>
                 <span style="color: #004080;">object</span> <span style="color: #000000;">ii</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">input</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span>
                 <span style="color: #008080;">if</span> <span style="color: #004080;">integer</span><span style="color: #0000FF;">(</span><span style="color: #000000;">ii</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">and</span> <span style="color: #000000;">ii</span><span style="color: #0000FF;"><</span><span style="color: #000000;">level</span> <span style="color: #008080;">then</span>
                     <span style="color: #000000;">subnest</span> <span style="color: #0000FF;">=</span> <span style="color: #004600;">false</span>
                     <span style="color: #000000;">output</span> <span style="color: #0000FF;">&=</span> <span style="color: #000000;">ii</span>
                 <span style="color: #008080;">elsif</span> <span style="color: #008080;">not</span> <span style="color: #000000;">subnest</span> <span style="color: #008080;">then</span>
                     <span style="color: #000000;">output</span> <span style="color: #0000FF;">&=</span> <span style="color: #0000FF;">{{</span><span style="color: #000000;">ii</span><span style="color: #0000FF;">}}</span>
                     <span style="color: #000000;">subnest</span> <span style="color: #0000FF;">=</span> <span style="color: #004600;">true</span>
                 <span style="color: #008080;">else</span>
                     <span style="color: #000000;">output</span><span style="color: #0000FF;">[$]</span> <span style="color: #0000FF;">&=</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">ii</span><span style="color: #0000FF;">}</span>
                 <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
             <span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
             <span style="color: #000000;">input</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">output</span>
         <span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
     <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
     <span style="color: #008080;">return</span> <span style="color: #000000;">input</span>
 <span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
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