RosettaCodeData/Task/Averages-Simple-moving-average/Phix/averages-simple-moving-average-1.phix

(phixonline)-->
 <span style="color: #008080;">with</span> <span style="color: #008080;">javascript_semantics</span>
 <span style="color: #004080;">sequence</span> <span style="color: #000000;">sma</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{}</span>       <span style="color: #000080;font-style:italic;">-- ((period,history,circnxt))  (private to sma.e)</span>
 <span style="color: #004080;">integer</span> <span style="color: #000000;">sma_free</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span>

 <span style="color: #008080;">global</span> <span style="color: #008080;">function</span> <span style="color: #000000;">new_sma</span><span style="color: #0000FF;">(</span><span style="color: #004080;">integer</span> <span style="color: #000000;">period</span><span style="color: #0000FF;">)</span>
 <span style="color: #004080;">integer</span> <span style="color: #000000;">res</span>
     <span style="color: #008080;">if</span> <span style="color: #000000;">sma_free</span> <span style="color: #008080;">then</span>
         <span style="color: #000000;">res</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">sma_free</span>
         <span style="color: #000000;">sma_free</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">sma</span><span style="color: #0000FF;">[</span><span style="color: #000000;">sma_free</span><span style="color: #0000FF;">]</span>
         <span style="color: #000000;">sma</span><span style="color: #0000FF;">[</span><span style="color: #000000;">res</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">period</span><span style="color: #0000FF;">,{},</span><span style="color: #000000;">0</span><span style="color: #0000FF;">}</span>
     <span style="color: #008080;">else</span>
         <span style="color: #000000;">sma</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">append</span><span style="color: #0000FF;">(</span><span style="color: #000000;">sma</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">period</span><span style="color: #0000FF;">,{},</span><span style="color: #000000;">0</span><span style="color: #0000FF;">})</span>
         <span style="color: #000000;">res</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">sma</span><span style="color: #0000FF;">)</span>
     <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
     <span style="color: #008080;">return</span> <span style="color: #000000;">res</span>
 <span style="color: #008080;">end</span> <span style="color: #008080;">function</span>

 <span style="color: #008080;">global</span> <span style="color: #008080;">procedure</span> <span style="color: #000000;">add_sma</span><span style="color: #0000FF;">(</span><span style="color: #004080;">integer</span> <span style="color: #000000;">sidx</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">atom</span> <span style="color: #000000;">val</span><span style="color: #0000FF;">)</span>
 <span style="color: #004080;">integer</span> <span style="color: #000000;">period</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">circnxt</span>
 <span style="color: #004080;">sequence</span> <span style="color: #000000;">history</span>
     <span style="color: #0000FF;">{</span><span style="color: #000000;">period</span><span style="color: #0000FF;">,</span><span style="color: #000000;">history</span><span style="color: #0000FF;">,</span><span style="color: #000000;">circnxt</span><span style="color: #0000FF;">}</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">sma</span><span style="color: #0000FF;">[</span><span style="color: #000000;">sidx</span><span style="color: #0000FF;">]</span>
     <span style="color: #000000;">sma</span><span style="color: #0000FF;">[</span><span style="color: #000000;">sidx</span><span style="color: #0000FF;">][</span><span style="color: #000000;">2</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span> <span style="color: #000080;font-style:italic;">-- (kill refcount)</span>
     <span style="color: #008080;">if</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">history</span><span style="color: #0000FF;">)<</span><span style="color: #000000;">period</span> <span style="color: #008080;">then</span>
         <span style="color: #000000;">history</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">append</span><span style="color: #0000FF;">(</span><span style="color: #000000;">history</span><span style="color: #0000FF;">,</span><span style="color: #000000;">val</span><span style="color: #0000FF;">)</span>
     <span style="color: #008080;">else</span>
         <span style="color: #000000;">circnxt</span> <span style="color: #0000FF;">+=</span> <span style="color: #000000;">1</span>
         <span style="color: #008080;">if</span> <span style="color: #000000;">circnxt</span><span style="color: #0000FF;">></span><span style="color: #000000;">period</span> <span style="color: #008080;">then</span>
             <span style="color: #000000;">circnxt</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">1</span>
         <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
         <span style="color: #000000;">sma</span><span style="color: #0000FF;">[</span><span style="color: #000000;">sidx</span><span style="color: #0000FF;">][</span><span style="color: #000000;">3</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">circnxt</span>
         <span style="color: #000000;">history</span><span style="color: #0000FF;">[</span><span style="color: #000000;">circnxt</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">val</span>
     <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
     <span style="color: #000000;">sma</span><span style="color: #0000FF;">[</span><span style="color: #000000;">sidx</span><span style="color: #0000FF;">][</span><span style="color: #000000;">2</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">history</span>
 <span style="color: #008080;">end</span> <span style="color: #008080;">procedure</span>

 <span style="color: #008080;">global</span> <span style="color: #008080;">function</span> <span style="color: #000000;">get_sma_average</span><span style="color: #0000FF;">(</span><span style="color: #004080;">integer</span> <span style="color: #000000;">sidx</span><span style="color: #0000FF;">)</span>
 <span style="color: #004080;">sequence</span> <span style="color: #000000;">history</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">sma</span><span style="color: #0000FF;">[</span><span style="color: #000000;">sidx</span><span style="color: #0000FF;">][</span><span style="color: #000000;">2</span><span style="color: #0000FF;">]</span>
 <span style="color: #004080;">integer</span> <span style="color: #000000;">l</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">history</span><span style="color: #0000FF;">)</span>
     <span style="color: #008080;">if</span> <span style="color: #000000;">l</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">then</span> <span style="color: #008080;">return</span> <span style="color: #000000;">0</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
     <span style="color: #008080;">return</span> <span style="color: #7060A8;">sum</span><span style="color: #0000FF;">(</span><span style="color: #000000;">history</span><span style="color: #0000FF;">)/</span><span style="color: #000000;">l</span>
 <span style="color: #008080;">end</span> <span style="color: #008080;">function</span>

 <span style="color: #008080;">global</span> <span style="color: #008080;">function</span> <span style="color: #000000;">moving_average</span><span style="color: #0000FF;">(</span><span style="color: #004080;">integer</span> <span style="color: #000000;">sidx</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">atom</span> <span style="color: #000000;">val</span><span style="color: #0000FF;">)</span>
     <span style="color: #000000;">add_sma</span><span style="color: #0000FF;">(</span><span style="color: #000000;">sidx</span><span style="color: #0000FF;">,</span><span style="color: #000000;">val</span><span style="color: #0000FF;">)</span>
     <span style="color: #008080;">return</span> <span style="color: #000000;">get_sma_average</span><span style="color: #0000FF;">(</span><span style="color: #000000;">sidx</span><span style="color: #0000FF;">)</span>
 <span style="color: #008080;">end</span> <span style="color: #008080;">function</span>

 <span style="color: #008080;">global</span> <span style="color: #008080;">procedure</span> <span style="color: #000000;">free_sma</span><span style="color: #0000FF;">(</span><span style="color: #004080;">integer</span> <span style="color: #000000;">sidx</span><span style="color: #0000FF;">)</span>
     <span style="color: #000000;">sma</span><span style="color: #0000FF;">[</span><span style="color: #000000;">sidx</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">sma_free</span>
     <span style="color: #000000;">sma_free</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">sidx</span>
 <span style="color: #008080;">end</span> <span style="color: #008080;">procedure</span>
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