RosettaCodeData/Task/Generate-random-chess-position/Phix/generate-random-chess-position.phix

(phixonline)-->
 <span style="color: #008080;">with</span> <span style="color: #008080;">javascript_semantics</span>
 <span style="color: #008080;">constant</span> <span style="color: #000000;">show_bad_boards</span> <span style="color: #0000FF;">=</span> <span style="color: #004600;">false</span>

 <span style="color: #004080;">string</span> <span style="color: #000000;">board</span>

 <span style="color: #008080;">function</span> <span style="color: #000000;">fen</span><span style="color: #0000FF;">()</span>
     <span style="color: #004080;">string</span> <span style="color: #000000;">res</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">""</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: #000000;">64</span> <span style="color: #008080;">by</span> <span style="color: #000000;">8</span> <span style="color: #008080;">do</span>
         <span style="color: #004080;">integer</span> <span style="color: #000000;">empty</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span>
         <span style="color: #008080;">for</span> <span style="color: #000000;">j</span><span style="color: #0000FF;">=</span><span style="color: #000000;">i</span> <span style="color: #008080;">to</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">+</span><span style="color: #000000;">7</span> <span style="color: #008080;">do</span>
             <span style="color: #008080;">if</span> <span style="color: #000000;">board</span><span style="color: #0000FF;">[</span><span style="color: #000000;">j</span><span style="color: #0000FF;">]=</span><span style="color: #008000;">'.'</span> <span style="color: #008080;">then</span>
                 <span style="color: #000000;">empty</span> <span style="color: #0000FF;">+=</span> <span style="color: #000000;">1</span>
             <span style="color: #008080;">else</span>
                 <span style="color: #008080;">if</span> <span style="color: #000000;">empty</span> <span style="color: #008080;">then</span>
                     <span style="color: #000000;">res</span> <span style="color: #0000FF;">&=</span> <span style="color: #000000;">empty</span><span style="color: #0000FF;">+</span><span style="color: #008000;">'0'</span>
                     <span style="color: #000000;">empty</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span>
                 <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
                 <span style="color: #000000;">res</span> <span style="color: #0000FF;">&=</span> <span style="color: #000000;">board</span><span style="color: #0000FF;">[</span><span style="color: #000000;">j</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: #008080;">if</span> <span style="color: #000000;">empty</span> <span style="color: #008080;">then</span>
             <span style="color: #000000;">res</span> <span style="color: #0000FF;">&=</span> <span style="color: #000000;">empty</span><span style="color: #0000FF;">+</span><span style="color: #008000;">'0'</span>
         <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
         <span style="color: #008080;">if</span> <span style="color: #000000;">i</span><span style="color: #0000FF;"><</span><span style="color: #000000;">57</span> <span style="color: #008080;">then</span> <span style="color: #000000;">res</span> <span style="color: #0000FF;">&=</span> <span style="color: #008000;">'/'</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;">res</span> <span style="color: #0000FF;">&=</span> <span style="color: #008000;">" w - - 0 1"</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;">function</span> <span style="color: #000000;">p15</span><span style="color: #0000FF;">()</span>
     <span style="color: #004080;">string</span> <span style="color: #000000;">res</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">"pppppppprrnnbbq"</span>
     <span style="color: #000080;font-style:italic;">-- promote 0..8 pawns</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;">rand</span><span style="color: #0000FF;">(</span><span style="color: #000000;">9</span><span style="color: #0000FF;">)-</span><span style="color: #000000;">1</span> <span style="color: #008080;">do</span>
         <span style="color: #000000;">res</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">res</span><span style="color: #0000FF;">[</span><span style="color: #7060A8;">rand</span><span style="color: #0000FF;">(</span><span style="color: #000000;">7</span><span style="color: #0000FF;">)+</span><span style="color: #000000;">8</span><span style="color: #0000FF;">]</span>
     <span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
     <span style="color: #000000;">res</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">shuffle</span><span style="color: #0000FF;">(</span><span style="color: #000000;">res</span><span style="color: #0000FF;">)</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;">function</span> <span style="color: #000000;">kings_adjacent</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">p12</span><span style="color: #0000FF;">)</span>
     <span style="color: #004080;">integer</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">p1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">p2</span><span style="color: #0000FF;">}</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">sq_sub</span><span style="color: #0000FF;">(</span><span style="color: #000000;">p12</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1</span><span style="color: #0000FF;">),</span>
             <span style="color: #000000;">row_diff</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">abs</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">floor</span><span style="color: #0000FF;">(</span><span style="color: #000000;">p1</span><span style="color: #0000FF;">/</span><span style="color: #000000;">8</span><span style="color: #0000FF;">)-</span><span style="color: #7060A8;">floor</span><span style="color: #0000FF;">(</span><span style="color: #000000;">p2</span><span style="color: #0000FF;">/</span><span style="color: #000000;">8</span><span style="color: #0000FF;">)),</span>
             <span style="color: #000000;">col_diff</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">abs</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">mod</span><span style="color: #0000FF;">(</span><span style="color: #000000;">p1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">8</span><span style="color: #0000FF;">)-</span><span style="color: #7060A8;">mod</span><span style="color: #0000FF;">(</span><span style="color: #000000;">p2</span><span style="color: #0000FF;">,</span><span style="color: #000000;">8</span><span style="color: #0000FF;">))</span>
     <span style="color: #008080;">return</span> <span style="color: #000000;">row_diff</span><span style="color: #0000FF;"><=</span><span style="color: #000000;">1</span> <span style="color: #008080;">and</span> <span style="color: #000000;">col_diff</span><span style="color: #0000FF;"><=</span><span style="color: #000000;">1</span>
 <span style="color: #008080;">end</span> <span style="color: #008080;">function</span>

 <span style="color: #004080;">integer</span> <span style="color: #000000;">lp</span>
 <span style="color: #008080;">procedure</span> <span style="color: #000000;">show_board</span><span style="color: #0000FF;">()</span>
     <span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"%d pieces\n%s"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">lp</span><span style="color: #0000FF;">,</span><span style="color: #7060A8;">join_by</span><span style="color: #0000FF;">(</span><span style="color: #000000;">board</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">8</span><span style="color: #0000FF;">,</span><span style="color: #008000;">""</span><span style="color: #0000FF;">)})</span>
 <span style="color: #008080;">end</span> <span style="color: #008080;">procedure</span>

 <span style="color: #008080;">while</span> <span style="color: #004600;">true</span> <span style="color: #008080;">do</span>
     <span style="color: #004080;">string</span> <span style="color: #000000;">pieces</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">"Kk"</span><span style="color: #0000FF;">&</span>                        <span style="color: #000080;font-style:italic;">-- kings</span>
                     <span style="color: #7060A8;">upper</span><span style="color: #0000FF;">(</span><span style="color: #000000;">p15</span><span style="color: #0000FF;">())[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">..</span><span style="color: #7060A8;">rand</span><span style="color: #0000FF;">(</span><span style="color: #000000;">16</span><span style="color: #0000FF;">)-</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]&</span> <span style="color: #000080;font-style:italic;">-- white</span>
                     <span style="color: #7060A8;">lower</span><span style="color: #0000FF;">(</span><span style="color: #000000;">p15</span><span style="color: #0000FF;">())[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">..</span><span style="color: #7060A8;">rand</span><span style="color: #0000FF;">(</span><span style="color: #000000;">16</span><span style="color: #0000FF;">)-</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span>  <span style="color: #000080;font-style:italic;">-- black</span>
     <span style="color: #000000;">lp</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">pieces</span><span style="color: #0000FF;">)</span>
     <span style="color: #004080;">sequence</span> <span style="color: #000000;">p</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">tagset</span><span style="color: #0000FF;">(</span><span style="color: #000000;">64</span><span style="color: #0000FF;">)</span>
     <span style="color: #000000;">p</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">shuffle</span><span style="color: #0000FF;">(</span><span style="color: #000000;">p</span><span style="color: #0000FF;">)</span>
     <span style="color: #000000;">board</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #008000;">'.'</span><span style="color: #0000FF;">,</span><span style="color: #000000;">64</span><span style="color: #0000FF;">)</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: #000000;">lp</span> <span style="color: #008080;">do</span> <span style="color: #000000;">board</span><span style="color: #0000FF;">[</span><span style="color: #000000;">p</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">pieces</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span> <span style="color: #008080;">end</span> <span style="color: #008080;">for</span>

     <span style="color: #008080;">if</span> <span style="color: #000000;">kings_adjacent</span><span style="color: #0000FF;">(</span><span style="color: #000000;">p</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">..</span><span style="color: #000000;">2</span><span style="color: #0000FF;">])</span> <span style="color: #008080;">then</span>
         <span style="color: #008080;">if</span> <span style="color: #000000;">show_bad_boards</span> <span style="color: #008080;">then</span> <span style="color: #000000;">show_board</span><span style="color: #0000FF;">()</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
         <span style="color: #7060A8;">puts</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"kings adjacent - reshuffle\n\n"</span><span style="color: #0000FF;">)</span>
     <span style="color: #008080;">else</span>
         <span style="color: #000080;font-style:italic;">-- check no pawn will be on a promotion square,
         -- and (above spec) no pawn has gone backwards:</span>
         <span style="color: #008080;">if</span> <span style="color: #7060A8;">find</span><span style="color: #0000FF;">(</span><span style="color: #008000;">'p'</span><span style="color: #0000FF;">,</span><span style="color: #7060A8;">lower</span><span style="color: #0000FF;">(</span><span style="color: #000000;">board</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">..</span><span style="color: #000000;">8</span><span style="color: #0000FF;">]&</span><span style="color: #000000;">board</span><span style="color: #0000FF;">[</span><span style="color: #000000;">57</span><span style="color: #0000FF;">..</span><span style="color: #000000;">64</span><span style="color: #0000FF;">]))=</span><span style="color: #000000;">0</span> <span style="color: #008080;">then</span> <span style="color: #008080;">exit</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
         <span style="color: #008080;">if</span> <span style="color: #000000;">show_bad_boards</span> <span style="color: #008080;">then</span> <span style="color: #000000;">show_board</span><span style="color: #0000FF;">()</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
         <span style="color: #7060A8;">puts</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"pawn on rank 1/8 - reshuffle\n\n"</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;">while</span>
 <span style="color: #000000;">show_board</span><span style="color: #0000FF;">()</span>
 <span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"\n%s\n"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">fen</span><span style="color: #0000FF;">()})</span>
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