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<a href='https://github.com/akkartik/mu/blob/master/chessboard.mu'>https://github.com/akkartik/mu/blob/master/chessboard.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment"># Chessboard program: you type in moves in algebraic notation, and it'll</span>
<span id="L2" class="LineNr"> 2 </span><span class="Comment"># display the position after each move.</span>
<span id="L3" class="LineNr"> 3 </span>
<span id="L4" class="LineNr"> 4 </span><span class="muRecipe">def</span> <a href='chessboard.mu.html#L4'>main</a> [
<span id="L5" class="LineNr"> 5 </span> <span class="Constant">local-scope</span>
<span id="L6" class="LineNr"> 6 </span> open-console <span class="Comment"># take control of screen, keyboard and mouse</span>
<span id="L7" class="LineNr"> 7 </span> <a href='081print.mu.html#L46'>clear-screen</a><span class="Constant"> null/screen</span> <span class="Comment"># non-scrolling app</span>
<span id="L8" class="LineNr"> 8 </span>
<span id="L9" class="LineNr"> 9 </span> <span class="Comment"># The chessboard function takes keyboard and screen objects as inputs.</span>
<span id="L10" class="LineNr"> 10 </span> <span class="Comment">#</span>
<span id="L11" class="LineNr"> 11 </span> <span class="Comment"># In Mu it is good form (though not required) to explicitly state what</span>
<span id="L12" class="LineNr"> 12 </span> <span class="Comment"># hardware a function needs.</span>
<span id="L13" class="LineNr"> 13 </span> <span class="Comment">#</span>
<span id="L14" class="LineNr"> 14 </span> <span class="Comment"># Here the console and screen are both null, which usually indicates real</span>
<span id="L15" class="LineNr"> 15 </span> <span class="Comment"># hardware rather than a fake for testing as you'll see below.</span>
<span id="L16" class="LineNr"> 16 </span> <a href='chessboard.mu.html#L69'>chessboard</a><span class="Constant"> null/screen, null/console</span>
<span id="L17" class="LineNr"> 17 </span>
<span id="L18" class="LineNr"> 18 </span> close-console <span class="Comment"># clean up screen, keyboard and mouse</span>
<span id="L19" class="LineNr"> 19 </span>]
<span id="L20" class="LineNr"> 20 </span>
<span id="L21" class="LineNr"> 21 </span><span class="SalientComment">## But enough about Mu. Here's what it looks like to run the chessboard program.</span>
<span id="L22" class="LineNr"> 22 </span>
<span id="L23" class="LineNr"> 23 </span><span class="muScenario">scenario</span> print-board-and-read-move [
<span id="L24" class="LineNr"> 24 </span> <span class="Constant">local-scope</span>
<span id="L25" class="LineNr"> 25 </span> trace-until <span class="Constant">100/app</span>
<span id="L26" class="LineNr"> 26 </span> <span class="Comment"># we'll make the screen really wide because the program currently prints out a long line</span>
<span id="L27" class="LineNr"> 27 </span> assume-screen <span class="Constant">120/width</span>, <span class="Constant">20/height</span>
<span id="L28" class="LineNr"> 28 </span> <span class="Comment"># initialize keyboard to type in a move</span>
<span id="L29" class="LineNr"> 29 </span> assume-console [
<span id="L30" class="LineNr"> 30 </span> type <span class="Constant">[a2-a4</span>
<span id="L31" class="LineNr"> 31 </span><span class="Constant">]</span>
<span id="L32" class="LineNr"> 32 </span> ]
<span id="L33" class="LineNr"> 33 </span> run [
<span id="L34" class="LineNr"> 34 </span> <a href='081print.mu.html#L16'>screen</a>, <a href='084console.mu.html#L23'>console</a> <span class="Special"><-</span> <a href='chessboard.mu.html#L69'>chessboard</a> <a href='081print.mu.html#L16'>screen</a>, <a href='084console.mu.html#L23'>console</a>
<span id="L35" class="LineNr"> 35 </span> <span class="Comment"># icon for the cursor</span>
<span id="L36" class="LineNr"> 36 </span> cursor-icon:char <span class="Special"><-</span> copy <span class="Constant">9251/␣</span>
<span id="L37" class="LineNr"> 37 </span> <a href='081print.mu.html#L16'>screen</a> <span class="Special"><-</span> print <a href='081print.mu.html#L16'>screen</a>, cursor-icon
<span id="L38" class="LineNr"> 38 </span> ]
<span id="L39" class="LineNr"> 39 </span> screen-should-contain [
<span id="L40" class="LineNr"> 40 </span> <span class="Comment"># 1 2 3 4 5 6 7 8 9 10 11</span>
<span id="L41" class="LineNr"> 41 </span> <span class="Comment"># 012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789</span>
<span id="L42" class="LineNr"> 42 </span> <span class="Constant"> .Stupid text-mode chessboard. White pieces in uppercase; black pieces in lowercase. No checking for legal moves. .</span>
<span id="L43" class="LineNr"> 43 </span> <span class="Constant"> . .</span>
<span id="L44" class="LineNr"> 44 </span> <span class="Constant"> .8 | r n b q k b n r .</span>
<span id="L45" class="LineNr"> 45 </span> <span class="Constant"> .7 | p p p p p p p p .</span>
<span id="L46" class="LineNr"> 46 </span> <span class="Constant"> .6 | .</span>
<span id="L47" class="LineNr"> 47 </span> <span class="Constant"> .5 | .</span>
<span id="L48" class="LineNr"> 48 </span> <span class="Constant"> .4 | P .</span>
<span id="L49" class="LineNr"> 49 </span> <span class="Constant"> .3 | .</span>
<span id="L50" class="LineNr"> 50 </span> <span class="Constant"> .2 | P P P P P P P .</span>
<span id="L51" class="LineNr"> 51 </span> <span class="Constant"> .1 | R N B Q K B N R .</span>
<span id="L52" class="LineNr"> 52 </span> <span class="Constant"> . +---------------- .</span>
<span id="L53" class="LineNr"> 53 </span> <span class="Constant"> . a b c d e f g h .</span>
<span id="L54" class="LineNr"> 54 </span> <span class="Constant"> . .</span>
<span id="L55" class="LineNr"> 55 </span> <span class="Constant"> .Type in your <a href='chessboard.mu.html#L239'>move</a> as <from square>-<to square>. For example: 'a2-a4'. Then press <enter>. .</span>
<span id="L56" class="LineNr"> 56 </span> <span class="Constant"> . .</span>
<span id="L57" class="LineNr"> 57 </span> <span class="Constant"> .Hit 'q' to exit. .</span>
<span id="L58" class="LineNr"> 58 </span> <span class="Constant"> . .</span>
<span id="L59" class="LineNr"> 59 </span> <span class="Constant"> .move: ␣ .</span>
<span id="L60" class="LineNr"> 60 </span> <span class="Constant"> . .</span>
<span id="L61" class="LineNr"> 61 </span> <span class="Constant"> . .</span>
<span id="L62" class="LineNr"> 62 </span> ]
<span id="L63" class="LineNr"> 63 </span>]
<span id="L64" class="LineNr"> 64 </span>
<span id="L65" class="LineNr"> 65 </span><span class="SalientComment">## Here's how 'chessboard' is implemented.</span>
<span id="L66" class="LineNr"> 66 </span>
<span id="L67" class="LineNr"> 67 </span><span class="muData">type</span> <a href='chessboard.mu.html#L67'>board</a> = &:@:&:@:char <span class="Comment"># a 2-D array of arrays of characters</span>
<span id="L68" class="LineNr"> 68 </span>
<span id="L69" class="LineNr"> 69 </span><span class="muRecipe">def</span> <a href='chessboard.mu.html#L69'>chessboard</a> <a href='081print.mu.html#L16'>screen</a>:&:<a href='081print.mu.html#L16'>screen</a>, <a href='084console.mu.html#L23'>console</a>:&:<a href='084console.mu.html#L23'>console</a><span class="muRecipe"> -> </span><a href='081print.mu.html#L16'>screen</a>:&:<a href='081print.mu.html#L16'>screen</a>, <a href='084console.mu.html#L23'>console</a>:&:<a href='084console.mu.html#L23'>console</a> [
<span id="L70" class="LineNr"> 70 </span> <span class="Constant">local-scope</span>
<span id="L71" class="LineNr"> 71 </span> <span class="Constant">load-inputs</span>
<span id="L72" class="LineNr"> 72 </span> <a href='chessboard.mu.html#L67'>board</a>:<a href='chessboard.mu.html#L67'>board</a> <span class="Special"><-</span> <a href='chessboard.mu.html#L190'>initial-position</a>
<span id="L73" class="LineNr"> 73 </span> <span class="Comment"># hook up stdin</span>
<span id="L74" class="LineNr"> 74 </span> stdin-in:&:<a href='075channel.mu.html#L36'>source</a>:char, stdin-out:&:<a href='075channel.mu.html#L40'>sink</a>:char <span class="Special"><-</span> <a href='075channel.mu.html#L44'>new-channel</a> <span class="Constant">10/capacity</span>
<span id="L75" class="LineNr"> 75 </span> <span class="muControl">start-running</span> <a href='084console.mu.html#L73'>send-keys-to-channel</a>, <a href='084console.mu.html#L23'>console</a>, stdin-out, <a href='081print.mu.html#L16'>screen</a>
<span id="L76" class="LineNr"> 76 </span> <span class="Comment"># buffer lines in stdin</span>
<span id="L77" class="LineNr"> 77 </span> buffered-stdin-in:&:<a href='075channel.mu.html#L36'>source</a>:char, buffered-stdin-out:&:<a href='075channel.mu.html#L40'>sink</a>:char <span class="Special"><-</span> <a href='075channel.mu.html#L44'>new-channel</a> <span class="Constant">10/capacity</span>
<span id="L78" class="LineNr"> 78 </span> <span class="muControl">start-running</span> <a href='075channel.mu.html#L400'>buffer-lines</a>, stdin-in, buffered-stdin-out
<span id="L79" class="LineNr"> 79 </span> <span class="Delimiter">{</span>
<span id="L80" class="LineNr"> 80 </span> print <a href='081print.mu.html#L16'>screen</a>, <span class="Constant">[Stupid text-mode chessboard. White pieces in uppercase; black pieces in lowercase. No checking for legal moves.</span>
<span id="L81" class="LineNr"> 81 </span><span class="Constant">]</span>
<span id="L82" class="LineNr"> 82 </span> <a href='081print.mu.html#L752'>cursor-to-next-line</a> <a href='081print.mu.html#L16'>screen</a>
<span id="L83" class="LineNr"> 83 </span> print <a href='081print.mu.html#L16'>screen</a>, <a href='chessboard.mu.html#L67'>board</a>
<span id="L84" class="LineNr"> 84 </span> <a href='081print.mu.html#L752'>cursor-to-next-line</a> <a href='081print.mu.html#L16'>screen</a>
<span id="L85" class="LineNr"> 85 </span> print <a href='081print.mu.html#L16'>screen</a>, <span class="Constant">[Type in your <a href='chessboard.mu.html#L239'>move</a> as <from square>-<to square>. For example: 'a2-a4'. Then press <enter>.</span>
<span id="L86" class="LineNr"> 86 </span><span class="Constant">]</span>
<span id="L87" class="LineNr"> 87 </span> <a href='081print.mu.html#L752'>cursor-to-next-line</a> <a href='081print.mu.html#L16'>screen</a>
<span id="L88" class="LineNr"> 88 </span> print <a href='081print.mu.html#L16'>screen</a> <span class="Constant">[Hit 'q' to exit.</span>
<span id="L89" class="LineNr"> 89 </span><span class="Constant">]</span>
<span id="L90" class="LineNr"> 90 </span> <span class="Delimiter">{</span>
<span id="L91" class="LineNr"> 91 </span> <a href='081print.mu.html#L752'>cursor-to-next-line</a> <a href='081print.mu.html#L16'>screen</a>
<span id="L92" class="LineNr"> 92 </span> <a href='081print.mu.html#L16'>screen</a> <span class="Special"><-</span> print <a href='081print.mu.html#L16'>screen</a>, <span class="Constant">[move: ]</span>
<span id="L93" class="LineNr"> 93 </span> m:&:<a href='chessboard.mu.html#L239'>move</a>, quit:bool, error:bool <span class="Special"><-</span> <a href='chessboard.mu.html#L248'>read-move</a> buffered-stdin-in, <a href='081print.mu.html#L16'>screen</a>
<span id="L94" class="LineNr"> 94 </span> <span class="muControl">break-if</span> quit, <span class="Constant">+quit</span>
<span id="L95" class="LineNr"> 95 </span> buffered-stdin-in <span class="Special"><-</span> <a href='075channel.mu.html#L304'>clear</a> buffered-stdin-in <span class="Comment"># cleanup after error. todo: test this?</span>
<span id="L96" class="LineNr"> 96 </span> <span class="muControl">loop-if</span> error
<span id="L97" class="LineNr"> 97 </span> <span class="Delimiter">}</span>
<span id="L98" class="LineNr"> 98 </span> <a href='chessboard.mu.html#L67'>board</a> <span class="Special"><-</span> <a href='chessboard.mu.html#L534'>make-move</a> <a href='chessboard.mu.html#L67'>board</a>, m
<span id="L99" class="LineNr"> 99 </span> <a href='081print.mu.html#L16'>screen</a> <span class="Special"><-</span> <a href='081print.mu.html#L46'>clear-screen</a> <a href='081print.mu.html#L16'>screen</a>
<span id="L100" class="LineNr">100 </span> <span class="muControl"> loop</span>
<span id="L101" class="LineNr">101 </span> <span class="Delimiter">}</span>
<span id="L102" class="LineNr">102 </span><span class="Constant"> +quit</span>
<span id="L103" class="LineNr">103 </span>]
<span id="L104" class="LineNr">104 </span>
<span id="L105" class="LineNr">105 </span><span class="SalientComment">## a board is an array of files, a file is an array of characters (squares)</span>
<span id="L106" class="LineNr">106 </span>
<span id="L107" class="LineNr">107 </span><span class="muRecipe">def</span> <a href='chessboard.mu.html#L107'>new-board</a> <a href='chessboard.mu.html#L190'>initial-position</a>:&:@:char<span class="muRecipe"> -> </span><a href='chessboard.mu.html#L67'>board</a>:<a href='chessboard.mu.html#L67'>board</a> [
<span id="L108" class="LineNr">108 </span> <span class="Constant">local-scope</span>
<span id="L109" class="LineNr">109 </span> <span class="Constant">load-inputs</span>
<span id="L110" class="LineNr">110 </span> <span class="Comment"># assert(length(initial-position) == 64)</span>
<span id="L111" class="LineNr">111 </span> len:num <span class="Special"><-</span> length *initial-position
<span id="L112" class="LineNr">112 </span> correct-length?:bool <span class="Special"><-</span> equal len,<span class="Constant"> 64</span>
<span id="L113" class="LineNr">113 </span> assert correct-length?, <span class="Constant">[chessboard had incorrect size]</span>
<span id="L114" class="LineNr">114 </span> <span class="Comment"># board is an array of pointers to files; file is an array of characters</span>
<span id="L115" class="LineNr">115 </span> <a href='chessboard.mu.html#L67'>board</a> <span class="Special"><-</span> new <span class="Delimiter">{</span>(address array character): type<span class="Delimiter">}</span>,<span class="Constant"> 8</span>
<span id="L116" class="LineNr">116 </span> col:num <span class="Special"><-</span> copy<span class="Constant"> 0</span>
<span id="L117" class="LineNr">117 </span> <span class="Delimiter">{</span>
<span id="L118" class="LineNr">118 </span> done?:bool <span class="Special"><-</span> equal col,<span class="Constant"> 8</span>
<span id="L119" class="LineNr">119 </span> <span class="muControl">break-if</span> done?
<span id="L120" class="LineNr">120 </span> file:&:@:char <span class="Special"><-</span> <a href='chessboard.mu.html#L127'>new-file</a> <a href='chessboard.mu.html#L190'>initial-position</a>, col
<span id="L121" class="LineNr">121 </span> *board <span class="Special"><-</span> put-index *board, col, file
<span id="L122" class="LineNr">122 </span> col <span class="Special"><-</span> add col,<span class="Constant"> 1</span>
<span id="L123" class="LineNr">123 </span> <span class="muControl"> loop</span>
<span id="L124" class="LineNr">124 </span> <span class="Delimiter">}</span>
<span id="L125" class="LineNr">125 </span>]
<span id="L126" class="LineNr">126 </span>
<span id="L127" class="LineNr">127 </span><span class="muRecipe">def</span> <a href='chessboard.mu.html#L127'>new-file</a> position:&:@:char, index:num<span class="muRecipe"> -> </span>result:&:@:char [
<span id="L128" class="LineNr">128 </span> <span class="Constant">local-scope</span>
<span id="L129" class="LineNr">129 </span> <span class="Constant">load-inputs</span>
<span id="L130" class="LineNr">130 </span> index <span class="Special"><-</span> multiply index,<span class="Constant"> 8</span>
<span id="L131" class="LineNr">131 </span> result <span class="Special"><-</span> new <span class="Constant">character:type</span>,<span class="Constant"> 8</span>
<span id="L132" class="LineNr">132 </span> row:num <span class="Special"><-</span> copy<span class="Constant"> 0</span>
<span id="L133" class="LineNr">133 </span> <span class="Delimiter">{</span>
<span id="L134" class="LineNr">134 </span> done?:bool <span class="Special"><-</span> equal row,<span class="Constant"> 8</span>
<span id="L135" class="LineNr">135 </span> <span class="muControl">break-if</span> done?
<span id="L136" class="LineNr">136 </span> square:char <span class="Special"><-</span> index *position, index
<span id="L137" class="LineNr">137 </span> *result <span class="Special"><-</span> put-index *result, row, square
<span id="L138" class="LineNr">138 </span> row <span class="Special"><-</span> add row,<span class="Constant"> 1</span>
<span id="L139" class="LineNr">139 </span> index <span class="Special"><-</span> add index,<span class="Constant"> 1</span>
<span id="L140" class="LineNr">140 </span> <span class="muControl"> loop</span>
<span id="L141" class="LineNr">141 </span> <span class="Delimiter">}</span>
<span id="L142" class="LineNr">142 </span>]
<span id="L143" class="LineNr">143 </span>
<span id="L144" class="LineNr">144 </span><span class="muRecipe">def</span> print <a href='081print.mu.html#L16'>screen</a>:&:<a href='081print.mu.html#L16'>screen</a>, <a href='chessboard.mu.html#L67'>board</a>:<a href='chessboard.mu.html#L67'>board</a><span class="muRecipe"> -> </span><a href='081print.mu.html#L16'>screen</a>:&:<a href='081print.mu.html#L16'>screen</a> [
<span id="L145" class="LineNr">145 </span> <span class="Constant">local-scope</span>
<span id="L146" class="LineNr">146 </span> <span class="Constant">load-inputs</span>
<span id="L147" class="LineNr">147 </span> row:num <span class="Special"><-</span> copy<span class="Constant"> 7</span> <span class="Comment"># start printing from the top of the board</span>
<span id="L148" class="LineNr">148 </span> space:char <span class="Special"><-</span> copy <span class="Constant">32/space</span>
<span id="L149" class="LineNr">149 </span> <span class="Comment"># print each row</span>
<span id="L150" class="LineNr">150 </span> <span class="Delimiter">{</span>
<span id="L151" class="LineNr">151 </span> done?:bool <span class="Special"><-</span> lesser-than row,<span class="Constant"> 0</span>
<span id="L152" class="LineNr">152 </span> <span class="muControl">break-if</span> done?
<span id="L153" class="LineNr">153 </span> <span class="Comment"># print rank number as a legend</span>
<span id="L154" class="LineNr">154 </span> rank:num <span class="Special"><-</span> add row,<span class="Constant"> 1</span>
<span id="L155" class="LineNr">155 </span> print <a href='081print.mu.html#L16'>screen</a>, rank
<span id="L156" class="LineNr">156 </span> print <a href='081print.mu.html#L16'>screen</a>, <span class="Constant">[ | ]</span>
<span id="L157" class="LineNr">157 </span> <span class="Comment"># print each square in the row</span>
<span id="L158" class="LineNr">158 </span> col:num <span class="Special"><-</span> copy<span class="Constant"> 0</span>
<span id="L159" class="LineNr">159 </span> <span class="Delimiter">{</span>
<span id="L160" class="LineNr">160 </span> done?:bool <span class="Special"><-</span> equal col:num,<span class="Constant"> 8</span>
<span id="L161" class="LineNr">161 </span> <span class="muControl">break-if</span> done?
<span id="L162" class="LineNr">162 </span> f:&:@:char <span class="Special"><-</span> index *board, col
<span id="L163" class="LineNr">163 </span> c:char <span class="Special"><-</span> index *f, row
<span id="L164" class="LineNr">164 </span> bg:num <span class="Special"><-</span> <a href='chessboard.mu.html#L181'>square-color</a> row, col
<span id="L165" class="LineNr">165 </span> print <a href='081print.mu.html#L16'>screen</a>, c, <span class="Constant">7/white</span>, bg
<span id="L166" class="LineNr">166 </span> print <a href='081print.mu.html#L16'>screen</a>, space
<span id="L167" class="LineNr">167 </span> col <span class="Special"><-</span> add col,<span class="Constant"> 1</span>
<span id="L168" class="LineNr">168 </span> <span class="muControl"> loop</span>
<span id="L169" class="LineNr">169 </span> <span class="Delimiter">}</span>
<span id="L170" class="LineNr">170 </span> row <span class="Special"><-</span> subtract row,<span class="Constant"> 1</span>
<span id="L171" class="LineNr">171 </span> <a href='081print.mu.html#L752'>cursor-to-next-line</a> <a href='081print.mu.html#L16'>screen</a>
<span id="L172" class="LineNr">172 </span> <span class="muControl"> loop</span>
<span id="L173" class="LineNr">173 </span> <span class="Delimiter">}</span>
<span id="L174" class="LineNr">174 </span> <span class="Comment"># print file letters as legend</span>
<span id="L175" class="LineNr">175 </span> print <a href='081print.mu.html#L16'>screen</a>, <span class="Constant">[ +----------------]</span>
<span id="L176" class="LineNr">176 </span> <a href='081print.mu.html#L752'>cursor-to-next-line</a> <a href='081print.mu.html#L16'>screen</a>
<span id="L177" class="LineNr">177 </span> print <a href='081print.mu.html#L16'>screen</a>, <span class="Constant">[ a b c d e f g h]</span>
<span id="L178" class="LineNr">178 </span> <a href='081print.mu.html#L752'>cursor-to-next-line</a> <a href='081print.mu.html#L16'>screen</a>
<span id="L179" class="LineNr">179 </span>]
<span id="L180" class="LineNr">180 </span>
<span id="L181" class="LineNr">181 </span><span class="muRecipe">def</span> <a href='chessboard.mu.html#L181'>square-color</a> row:num, col:num<span class="muRecipe"> -> </span>result:num [
<span id="L182" class="LineNr">182 </span> <span class="Constant">local-scope</span>
<span id="L183" class="LineNr">183 </span> <span class="Constant">load-inputs</span>
<span id="L184" class="LineNr">184 </span> result <span class="Special"><-</span> copy <span class="Constant">0/black</span>
<span id="L185" class="LineNr">185 </span> x:num <span class="Special"><-</span> add row, col
<span id="L186" class="LineNr">186 </span> _, rem:num <span class="Special"><-</span> divide-with-remainder x,<span class="Constant"> 2</span>
<span id="L187" class="LineNr">187 </span> <span class="muControl">return-if</span> rem,<span class="Constant"> 238</span>
<span id="L188" class="LineNr">188 </span>]
<span id="L189" class="LineNr">189 </span>
<span id="L190" class="LineNr">190 </span><span class="muRecipe">def</span> <a href='chessboard.mu.html#L190'>initial-position</a><span class="muRecipe"> -> </span><a href='chessboard.mu.html#L67'>board</a>:<a href='chessboard.mu.html#L67'>board</a> [
<span id="L191" class="LineNr">191 </span> <span class="Constant">local-scope</span>
<span id="L192" class="LineNr">192 </span> <span class="Comment"># layout in memory (in raster order):</span>
<span id="L193" class="LineNr">193 </span> <span class="Comment"># R P _ _ _ _ p r</span>
<span id="L194" class="LineNr">194 </span> <span class="Comment"># N P _ _ _ _ p n</span>
<span id="L195" class="LineNr">195 </span> <span class="Comment"># B P _ _ _ _ p b</span>
<span id="L196" class="LineNr">196 </span> <span class="Comment"># Q P _ _ _ _ p q</span>
<span id="L197" class="LineNr">197 </span> <span class="Comment"># K P _ _ _ _ p k</span>
<span id="L198" class="LineNr">198 </span> <span class="Comment"># B P _ _ _ _ p B</span>
<span id="L199" class="LineNr">199 </span> <span class="Comment"># N P _ _ _ _ p n</span>
<span id="L200" class="LineNr">200 </span> <span class="Comment"># R P _ _ _ _ p r</span>
<span id="L201" class="LineNr">201 </span> <a href='chessboard.mu.html#L190'>initial-position</a>:&:@:char <span class="Special"><-</span> <a href='063array.mu.html#L16'>new-array</a> <span class="Constant">82/R</span>, <span class="Constant">80/P</span>, <span class="Constant">32/blank</span>, <span class="Constant">32/blank</span>, <span class="Constant">32/blank</span>, <span class="Constant">32/blank</span>, <span class="Constant">112/p</span>, <span class="Constant">114/r</span>, <span class="Constant">78/N</span>, <span class="Constant">80/P</span>, <span class="Constant">32/blank</span>, <span class="Constant">32/blank</span>, <span class="Constant">32/blank</span>, <span class="Constant">32/blank</span>, <span class="Constant">112/p</span>, <span class="Constant">110/n</span>, <span class="Constant">66/B</span>, <span class="Constant">80/P</span>, <span class="Constant">32/blank</span>, <span class="Constant">32/blank</span>, <span class="Constant">32/blank</span>, <span class="Constant">32/blank</span>, <span class="Constant">112/p</span>, <span class="Constant">98/b</span>, <span class="Constant">81/Q</span>, <span class="Constant">80/P</span>, <span class="Constant">32/blank</span>, <span class="Constant">32/blank</span>, <span class="Constant">32/blank</span>, <span class="Constant">32/blank</span>, <span class="Constant">112/p</span>, <span class="Constant">113/q</span>, <span class="Constant">75/K</span>, <span class="Constant">80/P</span>, <span class="Constant">32/blank</span>, <span class="Constant">32/blank</span>, <span class="Constant">32/blank</span>, <span class="Constant">32/blank</span>, <span class="Constant">112/p</span>, <span class="Constant">107/k</span>, <span class="Constant">66/B</span>, <span class="Constant">80/P</span>, <span class="Constant">32/blank</span>, <span class="Constant">32/blank</span>, <span class="Constant">32/blank</span>, <span class="Constant">32/blank</span>, <span class="Constant">112/p</span>, <span class="Constant">98/b</span>, <span class="Constant">78/N</span>, <span class="Constant">80/P</span>, <span class="Constant">32/blank</span>, <span class="Constant">32/blank</span>, <span class="Constant">32/blank</span>, <span class="Constant">32/blank</span>, <span class="Constant">112/p</span>, <span class="Constant">110/n</span>, <span class="Constant">82/R</span>, <span class="Constant">80/P</span>, <span class="Constant">32/blank</span>, <span class="Constant">32/blank</span>, <span class="Constant">32/blank</span>, <span class="Constant">32/blank</span>, <span class="Constant">112/p</span>, <span class="Constant">114/r</span>
<span id="L202" class="LineNr">202 </span><span class="CommentedCode">#? 82/R, 80/P, 32/blank, 32/blank, 32/blank, 32/blank, 112/p, 114/r,</span>
<span id="L203" class="LineNr">203 </span><span class="CommentedCode">#? 78/N, 80/P, 32/blank, 32/blank, 32/blank, 32/blank, 112/p, 110/n,</span>
<span id="L204" class="LineNr">204 </span><span class="CommentedCode">#? 66/B, 80/P, 32/blank, 32/blank, 32/blank, 32/blank, 112/p, 98/b, </span>
<span id="L205" class="LineNr">205 </span><span class="CommentedCode">#? 81/Q, 80/P, 32/blank, 32/blank, 32/blank, 32/blank, 112/p, 113/q,</span>
<span id="L206" class="LineNr">206 </span><span class="CommentedCode">#? 75/K, 80/P, 32/blank, 32/blank, 32/blank, 32/blank, 112/p, 107/k,</span>
<span id="L207" class="LineNr">207 </span><span class="CommentedCode">#? 66/B, 80/P, 32/blank, 32/blank, 32/blank, 32/blank, 112/p, 98/b,</span>
<span id="L208" class="LineNr">208 </span><span class="CommentedCode">#? 78/N, 80/P, 32/blank, 32/blank, 32/blank, 32/blank, 112/p, 110/n,</span>
<span id="L209" class="LineNr">209 </span><span class="CommentedCode">#? 82/R, 80/P, 32/blank, 32/blank, 32/blank, 32/blank, 112/p, 114/r</span>
<span id="L210" class="LineNr">210 </span> <a href='chessboard.mu.html#L67'>board</a> <span class="Special"><-</span> <a href='chessboard.mu.html#L107'>new-board</a> <a href='chessboard.mu.html#L190'>initial-position</a>
<span id="L211" class="LineNr">211 </span>]
<span id="L212" class="LineNr">212 </span>
<span id="L213" class="LineNr">213 </span><span class="muScenario">scenario</span> printing-the-board [
<span id="L214" class="LineNr">214 </span> <span class="Constant">local-scope</span>
<span id="L215" class="LineNr">215 </span> <a href='chessboard.mu.html#L67'>board</a>:<a href='chessboard.mu.html#L67'>board</a> <span class="Special"><-</span> <a href='chessboard.mu.html#L190'>initial-position</a>
<span id="L216" class="LineNr">216 </span> assume-screen <span class="Constant">30/width</span>, <span class="Constant">12/height</span>
<span id="L217" class="LineNr">217 </span> run [
<span id="L218" class="LineNr">218 </span> <a href='081print.mu.html#L16'>screen</a> <span class="Special"><-</span> print <a href='081print.mu.html#L16'>screen</a>, <a href='chessboard.mu.html#L67'>board</a>
<span id="L219" class="LineNr">219 </span> ]
<span id="L220" class="LineNr">220 </span> screen-should-contain [
<span id="L221" class="LineNr">221 </span> <span class="Comment"># 012345678901234567890123456789</span>
<span id="L222" class="LineNr">222 </span> <span class="Constant"> .8 | r n b q k b n r .</span>
<span id="L223" class="LineNr">223 </span> <span class="Constant"> .7 | p p p p p p p p .</span>
<span id="L224" class="LineNr">224 </span> <span class="Constant"> .6 | .</span>
<span id="L225" class="LineNr">225 </span> <span class="Constant"> .5 | .</span>
<span id="L226" class="LineNr">226 </span> <span class="Constant"> .4 | .</span>
<span id="L227" class="LineNr">227 </span> <span class="Constant"> .3 | .</span>
<span id="L228" class="LineNr">228 </span> <span class="Constant"> .2 | P P P P P P P P .</span>
<span id="L229" class="LineNr">229 </span> <span class="Constant"> .1 | R N B Q K B N R .</span>
<span id="L230" class="LineNr">230 </span> <span class="Constant"> . +---------------- .</span>
<span id="L231" class="LineNr">231 </span> <span class="Constant"> . a b c d e f g h .</span>
<span id="L232" class="LineNr">232 </span> <span class="Constant"> . .</span>
<span id="L233" class="LineNr">233 </span> <span class="Constant"> . .</span>
<span id="L234" class="LineNr">234 </span> ]
<span id="L235" class="LineNr">235 </span>]
<span id="L236" class="LineNr">236 </span>
<span id="L237" class="LineNr">237 </span><span class="SalientComment">## data structure: move</span>
<span id="L238" class="LineNr">238 </span>
<span id="L239" class="LineNr">239 </span><span class="muData">container</span> <a href='chessboard.mu.html#L239'>move</a> [
<span id="L240" class="LineNr">240 </span> <span class="Comment"># valid range: 0-7</span>
<span id="L241" class="LineNr">241 </span> from-file:num
<span id="L242" class="LineNr">242 </span> from-rank:num
<span id="L243" class="LineNr">243 </span> to-file:num
<span id="L244" class="LineNr">244 </span> to-rank:num
<span id="L245" class="LineNr">245 </span>]
<span id="L246" class="LineNr">246 </span>
<span id="L247" class="LineNr">247 </span><span class="Comment"># prints only error messages to screen</span>
<span id="L248" class="LineNr">248 </span><span class="muRecipe">def</span> <a href='chessboard.mu.html#L248'>read-move</a> stdin:&:<a href='075channel.mu.html#L36'>source</a>:char, <a href='081print.mu.html#L16'>screen</a>:&:<a href='081print.mu.html#L16'>screen</a><span class="muRecipe"> -> </span>result:&:<a href='chessboard.mu.html#L239'>move</a>, quit?:bool, error?:bool, stdin:&:<a href='075channel.mu.html#L36'>source</a>:char, <a href='081print.mu.html#L16'>screen</a>:&:<a href='081print.mu.html#L16'>screen</a> [
<span id="L249" class="LineNr">249 </span> <span class="Constant">local-scope</span>
<span id="L250" class="LineNr">250 </span> <span class="Constant">load-inputs</span>
<span id="L251" class="LineNr">251 </span> from-file:num, quit?:bool, error?:bool <span class="Special"><-</span> <a href='chessboard.mu.html#L276'>read-file</a> stdin, <a href='081print.mu.html#L16'>screen</a>
<span id="L252" class="LineNr">252 </span> <span class="muControl">return-if</span> quit?,<span class="Constant"> null/dummy</span>
<span id="L253" class="LineNr">253 </span> <span class="muControl">return-if</span> error?,<span class="Constant"> null/dummy</span>
<span id="L254" class="LineNr">254 </span> <span class="Comment"># construct the move object</span>
<span id="L255" class="LineNr">255 </span> result:&:<a href='chessboard.mu.html#L239'>move</a> <span class="Special"><-</span> new <span class="Constant"><a href='chessboard.mu.html#L239'>move</a>:type</span>
<span id="L256" class="LineNr">256 </span> *result <span class="Special"><-</span> put *result, <span class="Constant">from-file:offset</span>, from-file
<span id="L257" class="LineNr">257 </span> from-rank:num, quit?, error? <span class="Special"><-</span> <a href='chessboard.mu.html#L314'>read-rank</a> stdin, <a href='081print.mu.html#L16'>screen</a>
<span id="L258" class="LineNr">258 </span> <span class="muControl">return-if</span> quit?,<span class="Constant"> null/dummy</span>
<span id="L259" class="LineNr">259 </span> <span class="muControl">return-if</span> error?,<span class="Constant"> null/dummy</span>
<span id="L260" class="LineNr">260 </span> *result <span class="Special"><-</span> put *result, <span class="Constant">from-rank:offset</span>, from-rank
<span id="L261" class="LineNr">261 </span> error? <span class="Special"><-</span> <a href='chessboard.mu.html#L352'>expect-from-channel</a> stdin, <span class="Constant">45/dash</span>, <a href='081print.mu.html#L16'>screen</a>
<span id="L262" class="LineNr">262 </span> <span class="muControl">return-if</span> error?,<span class="Constant"> null/dummy, false/quit</span>
<span id="L263" class="LineNr">263 </span> to-file:num, quit?, error? <span class="Special"><-</span> <a href='chessboard.mu.html#L276'>read-file</a> stdin, <a href='081print.mu.html#L16'>screen</a>
<span id="L264" class="LineNr">264 </span> <span class="muControl">return-if</span> quit?,<span class="Constant"> null/dummy</span>
<span id="L265" class="LineNr">265 </span> <span class="muControl">return-if</span> error?,<span class="Constant"> null/dummy</span>
<span id="L266" class="LineNr">266 </span> *result <span class="Special"><-</span> put *result, <span class="Constant">to-file:offset</span>, to-file
<span id="L267" class="LineNr">267 </span> to-rank:num, quit?, error? <span class="Special"><-</span> <a href='chessboard.mu.html#L314'>read-rank</a> stdin, <a href='081print.mu.html#L16'>screen</a>
<span id="L268" class="LineNr">268 </span> <span class="muControl">return-if</span> quit?,<span class="Constant"> null/dummy</span>
<span id="L269" class="LineNr">269 </span> <span class="muControl">return-if</span> error?,<span class="Constant"> null/dummy</span>
<span id="L270" class="LineNr">270 </span> *result <span class="Special"><-</span> put *result, <span class="Constant">to-rank:offset</span>, to-rank
<span id="L271" class="LineNr">271 </span> error? <span class="Special"><-</span> <a href='chessboard.mu.html#L352'>expect-from-channel</a> stdin, <span class="Constant">10/newline</span>, <a href='081print.mu.html#L16'>screen</a>
<span id="L272" class="LineNr">272 </span> <span class="muControl">return-if</span> error?,<span class="Constant"> null/dummy, false/quit</span>
<span id="L273" class="LineNr">273 </span>]
<span id="L274" class="LineNr">274 </span>
<span id="L275" class="LineNr">275 </span><span class="Comment"># valid values for file: 0-7</span>
<span id="L276" class="LineNr">276 </span><span class="muRecipe">def</span> <a href='chessboard.mu.html#L276'>read-file</a> stdin:&:<a href='075channel.mu.html#L36'>source</a>:char, <a href='081print.mu.html#L16'>screen</a>:&:<a href='081print.mu.html#L16'>screen</a><span class="muRecipe"> -> </span>file:num, quit:bool, error:bool, stdin:&:<a href='075channel.mu.html#L36'>source</a>:char, <a href='081print.mu.html#L16'>screen</a>:&:<a href='081print.mu.html#L16'>screen</a> [
<span id="L277" class="LineNr">277 </span> <span class="Constant">local-scope</span>
<span id="L278" class="LineNr">278 </span> <span class="Constant">load-inputs</span>
<span id="L279" class="LineNr">279 </span> c:char, eof?:bool, stdin <span class="Special"><-</span> read stdin
<span id="L280" class="LineNr">280 </span> <span class="muControl">return-if</span> eof?, <span class="Constant">0/dummy</span>,<span class="Constant"> true/quit, false/no-error</span>
<span id="L281" class="LineNr">281 </span> q-pressed?:bool <span class="Special"><-</span> equal c, <span class="Constant">81/Q</span>
<span id="L282" class="LineNr">282 </span> <span class="muControl">return-if</span> q-pressed?, <span class="Constant">0/dummy</span>,<span class="Constant"> true/quit, false/no-error</span>
<span id="L283" class="LineNr">283 </span> q-pressed? <span class="Special"><-</span> equal c, <span class="Constant">113/q</span>
<span id="L284" class="LineNr">284 </span> <span class="muControl">return-if</span> q-pressed?, <span class="Constant">0/dummy</span>,<span class="Constant"> true/quit, false/no-error</span>
<span id="L285" class="LineNr">285 </span> empty-fake-keyboard?:bool <span class="Special"><-</span> equal c, <span class="Constant">0/eof</span>
<span id="L286" class="LineNr">286 </span> <span class="muControl">return-if</span> empty-fake-keyboard?, <span class="Constant">0/dummy</span>,<span class="Constant"> true/quit, false/no-error</span>
<span id="L287" class="LineNr">287 </span> <span class="Delimiter">{</span>
<span id="L288" class="LineNr">288 </span> newline?:bool <span class="Special"><-</span> equal c, <span class="Constant">10/newline</span>
<span id="L289" class="LineNr">289 </span> <span class="muControl">break-unless</span> newline?
<span id="L290" class="LineNr">290 </span> print <a href='081print.mu.html#L16'>screen</a>, <span class="Constant">[that's not enough]</span>
<span id="L291" class="LineNr">291 </span> <span class="muControl"> return</span> <span class="Constant">0/dummy</span>,<span class="Constant"> false/don't-quit, true/error</span>
<span id="L292" class="LineNr">292 </span> <span class="Delimiter">}</span>
<span id="L293" class="LineNr">293 </span> file:num <span class="Special"><-</span> subtract c, <span class="Constant">97/a</span>
<span id="L294" class="LineNr">294 </span> <span class="Comment"># 'a' <= file <= 'h'</span>
<span id="L295" class="LineNr">295 </span> <span class="Delimiter">{</span>
<span id="L296" class="LineNr">296 </span> above-min:bool <span class="Special"><-</span> greater-or-equal file,<span class="Constant"> 0</span>
<span id="L297" class="LineNr">297 </span> <span class="muControl">break-if</span> above-min
<span id="L298" class="LineNr">298 </span> print <a href='081print.mu.html#L16'>screen</a>, <span class="Constant">[file too low: ]</span>
<span id="L299" class="LineNr">299 </span> print <a href='081print.mu.html#L16'>screen</a>, c
<span id="L300" class="LineNr">300 </span> <a href='081print.mu.html#L752'>cursor-to-next-line</a> <a href='081print.mu.html#L16'>screen</a>
<span id="L301" class="LineNr">301 </span> <span class="muControl"> return</span> <span class="Constant">0/dummy</span>,<span class="Constant"> false/don't-quit, true/error</span>
<span id="L302" class="LineNr">302 </span> <span class="Delimiter">}</span>
<span id="L303" class="LineNr">303 </span> <span class="Delimiter">{</span>
<span id="L304" class="LineNr">304 </span> below-max:bool <span class="Special"><-</span> lesser-than file,<span class="Constant"> 8</span>
<span id="L305" class="LineNr">305 </span> <span class="muControl">break-if</span> below-max
<span id="L306" class="LineNr">306 </span> print <a href='081print.mu.html#L16'>screen</a>, <span class="Constant">[file too high: ]</span>
<span id="L307" class="LineNr">307 </span> print <a href='081print.mu.html#L16'>screen</a>, c
<span id="L308" class="LineNr">308 </span> <span class="muControl"> return</span> <span class="Constant">0/dummy</span>,<span class="Constant"> false/don't-quit, true/error</span>
<span id="L309" class="LineNr">309 </span> <span class="Delimiter">}</span>
<span id="L310" class="LineNr">310 </span> <span class="muControl"> return</span> file,<span class="Constant"> false/don't-quit, false/no-error</span>
<span id="L311" class="LineNr">311 </span>]
<span id="L312" class="LineNr">312 </span>
<span id="L313" class="LineNr">313 </span><span class="Comment"># valid values for rank: 0-7</span>
<span id="L314" class="LineNr">314 </span><span class="muRecipe">def</span> <a href='chessboard.mu.html#L314'>read-rank</a> stdin:&:<a href='075channel.mu.html#L36'>source</a>:char, <a href='081print.mu.html#L16'>screen</a>:&:<a href='081print.mu.html#L16'>screen</a><span class="muRecipe"> -> </span>rank:num, quit?:bool, error?:bool, stdin:&:<a href='075channel.mu.html#L36'>source</a>:char, <a href='081print.mu.html#L16'>screen</a>:&:<a href='081print.mu.html#L16'>screen</a> [
<span id="L315" class="LineNr">315 </span> <span class="Constant">local-scope</span>
<span id="L316" class="LineNr">316 </span> <span class="Constant">load-inputs</span>
<span id="L317" class="LineNr">317 </span> c:char, eof?:bool, stdin <span class="Special"><-</span> read stdin
<span id="L318" class="LineNr">318 </span> <span class="muControl">return-if</span> eof?, <span class="Constant">0/dummy</span>,<span class="Constant"> true/quit, false/no-error</span>
<span id="L319" class="LineNr">319 </span> q-pressed?:bool <span class="Special"><-</span> equal c, <span class="Constant">81/Q</span>
<span id="L320" class="LineNr">320 </span> <span class="muControl">return-if</span> q-pressed?, <span class="Constant">0/dummy</span>,<span class="Constant"> true/quit, false/no-error</span>
<span id="L321" class="LineNr">321 </span> q-pressed? <span class="Special"><-</span> equal c, <span class="Constant">113/q</span>
<span id="L322" class="LineNr">322 </span> <span class="muControl">return-if</span> q-pressed?, <span class="Constant">0/dummy</span>,<span class="Constant"> true/quit, false/no-error</span>
<span id="L323" class="LineNr">323 </span> empty-fake-keyboard?:bool <span class="Special"><-</span> equal c, <span class="Constant">0/eof</span>
<span id="L324" class="LineNr">324 </span> <span class="muControl">return-if</span> empty-fake-keyboard?, <span class="Constant">0/dummy</span>,<span class="Constant"> true/quit, false/no-error</span>
<span id="L325" class="LineNr">325 </span> <span class="Delimiter">{</span>
<span id="L326" class="LineNr">326 </span> newline?:bool <span class="Special"><-</span> equal c,<span class="Constant"> 10</span> <span class="Comment"># newline</span>
<span id="L327" class="LineNr">327 </span> <span class="muControl">break-unless</span> newline?
<span id="L328" class="LineNr">328 </span> print <a href='081print.mu.html#L16'>screen</a>, <span class="Constant">[that's not enough]</span>
<span id="L329" class="LineNr">329 </span> <span class="muControl"> return</span> <span class="Constant">0/dummy</span>,<span class="Constant"> false/don't-quite, true/error</span>
<span id="L330" class="LineNr">330 </span> <span class="Delimiter">}</span>
<span id="L331" class="LineNr">331 </span> rank:num <span class="Special"><-</span> subtract c, <span class="Constant">49/'1'</span>
<span id="L332" class="LineNr">332 </span> <span class="Comment"># assert'1' <= rank <= '8'</span>
<span id="L333" class="LineNr">333 </span> <span class="Delimiter">{</span>
<span id="L334" class="LineNr">334 </span> above-min:bool <span class="Special"><-</span> greater-or-equal rank,<span class="Constant"> 0</span>
<span id="L335" class="LineNr">335 </span> <span class="muControl">break-if</span> above-min
<span id="L336" class="LineNr">336 </span> print <a href='081print.mu.html#L16'>screen</a>, <span class="Constant">[rank too low: ]</span>
<span id="L337" class="LineNr">337 </span> print <a href='081print.mu.html#L16'>screen</a>, c
<span id="L338" class="LineNr">338 </span> <span class="muControl"> return</span> <span class="Constant">0/dummy</span>,<span class="Constant"> false/don't-quite, true/error</span>
<span id="L339" class="LineNr">339 </span> <span class="Delimiter">}</span>
<span id="L340" class="LineNr">340 </span> <span class="Delimiter">{</span>
<span id="L341" class="LineNr">341 </span> below-max:bool <span class="Special"><-</span> lesser-or-equal rank,<span class="Constant"> 7</span>
<span id="L342" class="LineNr">342 </span> <span class="muControl">break-if</span> below-max
<span id="L343" class="LineNr">343 </span> print <a href='081print.mu.html#L16'>screen</a>, <span class="Constant">[rank too high: ]</span>
<span id="L344" class="LineNr">344 </span> print <a href='081print.mu.html#L16'>screen</a>, c
<span id="L345" class="LineNr">345 </span> <span class="muControl"> return</span> <span class="Constant">0/dummy</span>,<span class="Constant"> false/don't-quite, true/error</span>
<span id="L346" class="LineNr">346 </span> <span class="Delimiter">}</span>
<span id="L347" class="LineNr">347 </span> <span class="muControl"> return</span> rank,<span class="Constant"> false/don't-quite, false/no-error</span>
<span id="L348" class="LineNr">348 </span>]
<span id="L349" class="LineNr">349 </span>
<span id="L350" class="LineNr">350 </span><span class="Comment"># read a character from the given channel and check that it's what we expect</span>
<span id="L351" class="LineNr">351 </span><span class="Comment"># return true on error</span>
<span id="L352" class="LineNr">352 </span><span class="muRecipe">def</span> <a href='chessboard.mu.html#L352'>expect-from-channel</a> stdin:&:<a href='075channel.mu.html#L36'>source</a>:char, expected:char, <a href='081print.mu.html#L16'>screen</a>:&:<a href='081print.mu.html#L16'>screen</a><span class="muRecipe"> -> </span>result:bool, stdin:&:<a href='075channel.mu.html#L36'>source</a>:char, <a href='081print.mu.html#L16'>screen</a>:&:<a href='081print.mu.html#L16'>screen</a> [
<span id="L353" class="LineNr">353 </span> <span class="Constant">local-scope</span>
<span id="L354" class="LineNr">354 </span> <span class="Constant">load-inputs</span>
<span id="L355" class="LineNr">355 </span> c:char, eof?:bool, stdin <span class="Special"><-</span> read stdin
<span id="L356" class="LineNr">356 </span> <span class="muControl">return-if</span> eof?<span class="Constant"> true</span>
<span id="L357" class="LineNr">357 </span> <span class="Delimiter">{</span>
<span id="L358" class="LineNr">358 </span> match?:bool <span class="Special"><-</span> equal c, expected
<span id="L359" class="LineNr">359 </span> <span class="muControl">break-if</span> match?
<span id="L360" class="LineNr">360 </span> print <a href='081print.mu.html#L16'>screen</a>, <span class="Constant">[expected character not found]</span>
<span id="L361" class="LineNr">361 </span> <span class="Delimiter">}</span>
<span id="L362" class="LineNr">362 </span> result <span class="Special"><-</span> not match?
<span id="L363" class="LineNr">363 </span>]
<span id="L364" class="LineNr">364 </span>
<span id="L365" class="LineNr">365 </span><span class="muScenario">scenario</span> read-move-blocking [
<span id="L366" class="LineNr">366 </span> <span class="Constant">local-scope</span>
<span id="L367" class="LineNr">367 </span> assume-screen <span class="Constant">20/width</span>, <span class="Constant">2/height</span>
<span id="L368" class="LineNr">368 </span> <a href='075channel.mu.html#L36'>source</a>:&:<a href='075channel.mu.html#L36'>source</a>:char, <a href='075channel.mu.html#L40'>sink</a>:&:<a href='075channel.mu.html#L40'>sink</a>:char <span class="Special"><-</span> <a href='075channel.mu.html#L44'>new-channel</a> <span class="Constant">2/capacity</span>
<span id="L369" class="LineNr">369 </span> read-move-routine:num/routine <span class="Special"><-</span> <span class="muControl">start-running</span> <a href='chessboard.mu.html#L248'>read-move</a>, <a href='075channel.mu.html#L36'>source</a>, <a href='081print.mu.html#L16'>screen</a>
<span id="L370" class="LineNr">370 </span> run [
<span id="L371" class="LineNr">371 </span> <span class="Comment"># 'read-move' is waiting for keypress</span>
<span id="L372" class="LineNr">372 </span> wait-for-routine-to-block read-move-routine
<span id="L373" class="LineNr">373 </span> read-move-state:num <span class="Special"><-</span> routine-state read-move-routine
<span id="L374" class="LineNr">374 </span> waiting?:bool <span class="Special"><-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
<span id="L375" class="LineNr">375 </span> assert waiting?, <span class="Constant">[ </span>
<span id="L376" class="LineNr">376 </span><span class="Constant">F read-move-blocking: routine failed to pause after coming up (before any keys were pressed)]</span>
<span id="L377" class="LineNr">377 </span> <span class="Comment"># press 'a'</span>
<span id="L378" class="LineNr">378 </span> <a href='075channel.mu.html#L40'>sink</a> <span class="Special"><-</span> <a href='075channel.mu.html#L60'>write</a> <a href='075channel.mu.html#L40'>sink</a>, <span class="Constant">97/a</span>
<span id="L379" class="LineNr">379 </span> restart read-move-routine
<span id="L380" class="LineNr">380 </span> <span class="Comment"># 'read-move' still waiting for keypress</span>
<span id="L381" class="LineNr">381 </span> wait-for-routine-to-block read-move-routine
<span id="L382" class="LineNr">382 </span> read-move-state <span class="Special"><-</span> routine-state read-move-routine
<span id="L383" class="LineNr">383 </span> waiting? <span class="Special"><-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
<span id="L384" class="LineNr">384 </span> assert waiting?, <span class="Constant">[ </span>
<span id="L385" class="LineNr">385 </span><span class="Constant">F read-move-blocking: routine failed to pause after rank 'a']</span>
<span id="L386" class="LineNr">386 </span> <span class="Comment"># press '2'</span>
<span id="L387" class="LineNr">387 </span> <a href='075channel.mu.html#L40'>sink</a> <span class="Special"><-</span> <a href='075channel.mu.html#L60'>write</a> <a href='075channel.mu.html#L40'>sink</a>, <span class="Constant">50/'2'</span>
<span id="L388" class="LineNr">388 </span> restart read-move-routine
<span id="L389" class="LineNr">389 </span> <span class="Comment"># 'read-move' still waiting for keypress</span>
<span id="L390" class="LineNr">390 </span> wait-for-routine-to-block read-move-routine
<span id="L391" class="LineNr">391 </span> read-move-state <span class="Special"><-</span> routine-state read-move-routine
<span id="L392" class="LineNr">392 </span> waiting? <span class="Special"><-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
<span id="L393" class="LineNr">393 </span> assert waiting?, <span class="Constant">[ </span>
<span id="L394" class="LineNr">394 </span><span class="Constant">F read-move-blocking: routine failed to pause after file 'a2']</span>
<span id="L395" class="LineNr">395 </span> <span class="Comment"># press '-'</span>
<span id="L396" class="LineNr">396 </span> <a href='075channel.mu.html#L40'>sink</a> <span class="Special"><-</span> <a href='075channel.mu.html#L60'>write</a> <a href='075channel.mu.html#L40'>sink</a>, <span class="Constant">45/'-'</span>
<span id="L397" class="LineNr">397 </span> restart read-move-routine
<span id="L398" class="LineNr">398 </span> <span class="Comment"># 'read-move' still waiting for keypress</span>
<span id="L399" class="LineNr">399 </span> wait-for-routine-to-block read-move-routine
<span id="L400" class="LineNr">400 </span> read-move-state <span class="Special"><-</span> routine-state read-move-routine
<span id="L401" class="LineNr">401 </span> waiting? <span class="Special"><-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
<span id="L402" class="LineNr">402 </span> assert waiting?, <span class="Constant">[ </span>
<span id="L403" class="LineNr">403 </span><span class="Constant">F read-move-blocking: routine failed to pause after hyphen 'a2-']</span>
<span id="L404" class="LineNr">404 </span> <span class="Comment"># press 'a'</span>
<span id="L405" class="LineNr">405 </span> <a href='075channel.mu.html#L40'>sink</a> <span class="Special"><-</span> <a href='075channel.mu.html#L60'>write</a> <a href='075channel.mu.html#L40'>sink</a>, <span class="Constant">97/a</span>
<span id="L406" class="LineNr">406 </span> restart read-move-routine
<span id="L407" class="LineNr">407 </span> <span class="Comment"># 'read-move' still waiting for keypress</span>
<span id="L408" class="LineNr">408 </span> wait-for-routine-to-block read-move-routine
<span id="L409" class="LineNr">409 </span> read-move-state <span class="Special"><-</span> routine-state read-move-routine
<span id="L410" class="LineNr">410 </span> waiting? <span class="Special"><-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
<span id="L411" class="LineNr">411 </span> assert waiting?, <span class="Constant">[ </span>
<span id="L412" class="LineNr">412 </span><span class="Constant">F read-move-blocking: routine failed to pause after rank 'a2-a']</span>
<span id="L413" class="LineNr">413 </span> <span class="Comment"># press '4'</span>
<span id="L414" class="LineNr">414 </span> <a href='075channel.mu.html#L40'>sink</a> <span class="Special"><-</span> <a href='075channel.mu.html#L60'>write</a> <a href='075channel.mu.html#L40'>sink</a>, <span class="Constant">52/'4'</span>
<span id="L415" class="LineNr">415 </span> restart read-move-routine
<span id="L416" class="LineNr">416 </span> <span class="Comment"># 'read-move' still waiting for keypress</span>
<span id="L417" class="LineNr">417 </span> wait-for-routine-to-block read-move-routine
<span id="L418" class="LineNr">418 </span> read-move-state <span class="Special"><-</span> routine-state read-move-routine
<span id="L419" class="LineNr">419 </span> waiting? <span class="Special"><-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
<span id="L420" class="LineNr">420 </span> assert waiting?, <span class="Constant">[ </span>
<span id="L421" class="LineNr">421 </span><span class="Constant">F read-move-blocking: routine failed to pause after file 'a2-a4']</span>
<span id="L422" class="LineNr">422 </span> <span class="Comment"># press 'newline'</span>
<span id="L423" class="LineNr">423 </span> <a href='075channel.mu.html#L40'>sink</a> <span class="Special"><-</span> <a href='075channel.mu.html#L60'>write</a> <a href='075channel.mu.html#L40'>sink</a>,<span class="Constant"> 10</span> <span class="Comment"># newline</span>
<span id="L424" class="LineNr">424 </span> restart read-move-routine
<span id="L425" class="LineNr">425 </span> <span class="Comment"># 'read-move' now completes</span>
<span id="L426" class="LineNr">426 </span> wait-for-routine-to-block read-move-routine
<span id="L427" class="LineNr">427 </span> read-move-state <span class="Special"><-</span> routine-state read-move-routine
<span id="L428" class="LineNr">428 </span> completed?:bool <span class="Special"><-</span> equal read-move-state, <span class="Constant">1/completed</span>
<span id="L429" class="LineNr">429 </span> assert completed?, <span class="Constant">[ </span>
<span id="L430" class="LineNr">430 </span><span class="Constant">F read-move-blocking: routine failed to terminate on newline]</span>
<span id="L431" class="LineNr">431 </span> trace<span class="Constant"> 1</span>, <span class="Constant">[test]</span>, <span class="Constant">[reached end]</span>
<span id="L432" class="LineNr">432 </span> ]
<span id="L433" class="LineNr">433 </span> trace-should-contain [
<span id="L434" class="LineNr">434 </span> test: reached end
<span id="L435" class="LineNr">435 </span> ]
<span id="L436" class="LineNr">436 </span>]
<span id="L437" class="LineNr">437 </span>
<span id="L438" class="LineNr">438 </span><span class="muScenario">scenario</span> read-move-quit [
<span id="L439" class="LineNr">439 </span> <span class="Constant">local-scope</span>
<span id="L440" class="LineNr">440 </span> assume-screen <span class="Constant">20/width</span>, <span class="Constant">2/height</span>
<span id="L441" class="LineNr">441 </span> <a href='075channel.mu.html#L36'>source</a>:&:<a href='075channel.mu.html#L36'>source</a>:char, <a href='075channel.mu.html#L40'>sink</a>:&:<a href='075channel.mu.html#L40'>sink</a>:char <span class="Special"><-</span> <a href='075channel.mu.html#L44'>new-channel</a> <span class="Constant">2/capacity</span>
<span id="L442" class="LineNr">442 </span> read-move-routine:num <span class="Special"><-</span> <span class="muControl">start-running</span> <a href='chessboard.mu.html#L248'>read-move</a>, <a href='075channel.mu.html#L36'>source</a>, <a href='081print.mu.html#L16'>screen</a>
<span id="L443" class="LineNr">443 </span> run [
<span id="L444" class="LineNr">444 </span> <span class="Comment"># 'read-move' is waiting for keypress</span>
<span id="L445" class="LineNr">445 </span> wait-for-routine-to-block read-move-routine
<span id="L446" class="LineNr">446 </span> read-move-state:num <span class="Special"><-</span> routine-state read-move-routine
<span id="L447" class="LineNr">447 </span> waiting?:bool <span class="Special"><-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
<span id="L448" class="LineNr">448 </span> assert waiting?, <span class="Constant">[ </span>
<span id="L449" class="LineNr">449 </span><span class="Constant">F read-move-quit: routine failed to pause after coming up (before any keys were pressed)]</span>
<span id="L450" class="LineNr">450 </span> <span class="Comment"># press 'q'</span>
<span id="L451" class="LineNr">451 </span> <a href='075channel.mu.html#L40'>sink</a> <span class="Special"><-</span> <a href='075channel.mu.html#L60'>write</a> <a href='075channel.mu.html#L40'>sink</a>, <span class="Constant">113/q</span>
<span id="L452" class="LineNr">452 </span> restart read-move-routine
<span id="L453" class="LineNr">453 </span> <span class="Comment"># 'read-move' completes</span>
<span id="L454" class="LineNr">454 </span> wait-for-routine-to-block read-move-routine
<span id="L455" class="LineNr">455 </span> read-move-state <span class="Special"><-</span> routine-state read-move-routine
<span id="L456" class="LineNr">456 </span> completed?:bool <span class="Special"><-</span> equal read-move-state, <span class="Constant">1/completed</span>
<span id="L457" class="LineNr">457 </span> assert completed?, <span class="Constant">[ </span>
<span id="L458" class="LineNr">458 </span><span class="Constant">F read-move-quit: routine failed to terminate on 'q']</span>
<span id="L459" class="LineNr">459 </span> trace<span class="Constant"> 1</span>, <span class="Constant">[test]</span>, <span class="Constant">[reached end]</span>
<span id="L460" class="LineNr">460 </span> ]
<span id="L461" class="LineNr">461 </span> trace-should-contain [
<span id="L462" class="LineNr">462 </span> test: reached end
<span id="L463" class="LineNr">463 </span> ]
<span id="L464" class="LineNr">464 </span>]
<span id="L465" class="LineNr">465 </span>
<span id="L466" class="LineNr">466 </span><span class="muScenario">scenario</span> read-move-illegal-file [
<span id="L467" class="LineNr">467 </span> <span class="Constant">local-scope</span>
<span id="L468" class="LineNr">468 </span> assume-screen <span class="Constant">20/width</span>, <span class="Constant">2/height</span>
<span id="L469" class="LineNr">469 </span> <a href='075channel.mu.html#L36'>source</a>:&:<a href='075channel.mu.html#L36'>source</a>:char, <a href='075channel.mu.html#L40'>sink</a>:&:<a href='075channel.mu.html#L40'>sink</a>:char <span class="Special"><-</span> <a href='075channel.mu.html#L44'>new-channel</a> <span class="Constant">2/capacity</span>
<span id="L470" class="LineNr">470 </span> read-move-routine:num <span class="Special"><-</span> <span class="muControl">start-running</span> <a href='chessboard.mu.html#L248'>read-move</a>, <a href='075channel.mu.html#L36'>source</a>, <a href='081print.mu.html#L16'>screen</a>
<span id="L471" class="LineNr">471 </span> run [
<span id="L472" class="LineNr">472 </span> <span class="Comment"># 'read-move' is waiting for keypress</span>
<span id="L473" class="LineNr">473 </span> wait-for-routine-to-block read-move-routine
<span id="L474" class="LineNr">474 </span> read-move-state:num <span class="Special"><-</span> routine-state read-move-routine
<span id="L475" class="LineNr">475 </span> waiting?:bool <span class="Special"><-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
<span id="L476" class="LineNr">476 </span> assert waiting?, <span class="Constant">[ </span>
<span id="L477" class="LineNr">477 </span><span class="Constant">F read-move-illegal-file: routine failed to pause after coming up (before any keys were pressed)]</span>
<span id="L478" class="LineNr">478 </span> <a href='075channel.mu.html#L40'>sink</a> <span class="Special"><-</span> <a href='075channel.mu.html#L60'>write</a> <a href='075channel.mu.html#L40'>sink</a>, <span class="Constant">50/'2'</span>
<span id="L479" class="LineNr">479 </span> restart read-move-routine
<span id="L480" class="LineNr">480 </span> wait-for-routine-to-block read-move-routine
<span id="L481" class="LineNr">481 </span> ]
<span id="L482" class="LineNr">482 </span> screen-should-contain [
<span id="L483" class="LineNr">483 </span> <span class="Constant"> .file too low: 2 .</span>
<span id="L484" class="LineNr">484 </span> <span class="Constant"> . .</span>
<span id="L485" class="LineNr">485 </span> ]
<span id="L486" class="LineNr">486 </span>]
<span id="L487" class="LineNr">487 </span>
<span id="L488" class="LineNr">488 </span><span class="muScenario">scenario</span> read-move-illegal-rank [
<span id="L489" class="LineNr">489 </span> <span class="Constant">local-scope</span>
<span id="L490" class="LineNr">490 </span> assume-screen <span class="Constant">20/width</span>, <span class="Constant">2/height</span>
<span id="L491" class="LineNr">491 </span> <a href='075channel.mu.html#L36'>source</a>:&:<a href='075channel.mu.html#L36'>source</a>:char, <a href='075channel.mu.html#L40'>sink</a>:&:<a href='075channel.mu.html#L40'>sink</a>:char <span class="Special"><-</span> <a href='075channel.mu.html#L44'>new-channel</a> <span class="Constant">2/capacity</span>
<span id="L492" class="LineNr">492 </span> read-move-routine:num <span class="Special"><-</span> <span class="muControl">start-running</span> <a href='chessboard.mu.html#L248'>read-move</a>, <a href='075channel.mu.html#L36'>source</a>, <a href='081print.mu.html#L16'>screen</a>
<span id="L493" class="LineNr">493 </span> run [
<span id="L494" class="LineNr">494 </span> <span class="Comment"># 'read-move' is waiting for keypress</span>
<span id="L495" class="LineNr">495 </span> wait-for-routine-to-block read-move-routine
<span id="L496" class="LineNr">496 </span> read-move-state:num <span class="Special"><-</span> routine-state read-move-routine
<span id="L497" class="LineNr">497 </span> waiting?:bool <span class="Special"><-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
<span id="L498" class="LineNr">498 </span> assert waiting?, <span class="Constant">[ </span>
<span id="L499" class="LineNr">499 </span><span class="Constant">F read-move-illegal-rank: routine failed to pause after coming up (before any keys were pressed)]</span>
<span id="L500" class="LineNr">500 </span> <a href='075channel.mu.html#L40'>sink</a> <span class="Special"><-</span> <a href='075channel.mu.html#L60'>write</a> <a href='075channel.mu.html#L40'>sink</a>, <span class="Constant">97/a</span>
<span id="L501" class="LineNr">501 </span> <a href='075channel.mu.html#L40'>sink</a> <span class="Special"><-</span> <a href='075channel.mu.html#L60'>write</a> <a href='075channel.mu.html#L40'>sink</a>, <span class="Constant">97/a</span>
<span id="L502" class="LineNr">502 </span> restart read-move-routine
<span id="L503" class="LineNr">503 </span> wait-for-routine-to-block read-move-routine
<span id="L504" class="LineNr">504 </span> ]
<span id="L505" class="LineNr">505 </span> screen-should-contain [
<span id="L506" class="LineNr">506 </span> <span class="Constant"> .rank too high: a .</span>
<span id="L507" class="LineNr">507 </span> <span class="Constant"> . .</span>
<span id="L508" class="LineNr">508 </span> ]
<span id="L509" class="LineNr">509 </span>]
<span id="L510" class="LineNr">510 </span>
<span id="L511" class="LineNr">511 </span><span class="muScenario">scenario</span> read-move-empty [
<span id="L512" class="LineNr">512 </span> <span class="Constant">local-scope</span>
<span id="L513" class="LineNr">513 </span> assume-screen <span class="Constant">20/width</span>, <span class="Constant">2/height</span>
<span id="L514" class="LineNr">514 </span> <a href='075channel.mu.html#L36'>source</a>:&:<a href='075channel.mu.html#L36'>source</a>:char, <a href='075channel.mu.html#L40'>sink</a>:&:<a href='075channel.mu.html#L40'>sink</a>:char <span class="Special"><-</span> <a href='075channel.mu.html#L44'>new-channel</a> <span class="Constant">2/capacity</span>
<span id="L515" class="LineNr">515 </span> read-move-routine:num <span class="Special"><-</span> <span class="muControl">start-running</span> <a href='chessboard.mu.html#L248'>read-move</a>, <a href='075channel.mu.html#L36'>source</a>, <a href='081print.mu.html#L16'>screen</a>
<span id="L516" class="LineNr">516 </span> run [
<span id="L517" class="LineNr">517 </span> <span class="Comment"># 'read-move' is waiting for keypress</span>
<span id="L518" class="LineNr">518 </span> wait-for-routine-to-block read-move-routine
<span id="L519" class="LineNr">519 </span> read-move-state:num <span class="Special"><-</span> routine-state read-move-routine
<span id="L520" class="LineNr">520 </span> waiting?:bool <span class="Special"><-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
<span id="L521" class="LineNr">521 </span> assert waiting?, <span class="Constant">[ </span>
<span id="L522" class="LineNr">522 </span><span class="Constant">F read-move-empty: routine failed to pause after coming up (before any keys were pressed)]</span>
<span id="L523" class="LineNr">523 </span> <a href='075channel.mu.html#L40'>sink</a> <span class="Special"><-</span> <a href='075channel.mu.html#L60'>write</a> <a href='075channel.mu.html#L40'>sink</a>, <span class="Constant">10/newline</span>
<span id="L524" class="LineNr">524 </span> <a href='075channel.mu.html#L40'>sink</a> <span class="Special"><-</span> <a href='075channel.mu.html#L60'>write</a> <a href='075channel.mu.html#L40'>sink</a>, <span class="Constant">97/a</span>
<span id="L525" class="LineNr">525 </span> restart read-move-routine
<span id="L526" class="LineNr">526 </span> wait-for-routine-to-block read-move-routine
<span id="L527" class="LineNr">527 </span> ]
<span id="L528" class="LineNr">528 </span> screen-should-contain [
<span id="L529" class="LineNr">529 </span> <span class="Constant"> .that's not enough .</span>
<span id="L530" class="LineNr">530 </span> <span class="Constant"> . .</span>
<span id="L531" class="LineNr">531 </span> ]
<span id="L532" class="LineNr">532 </span>]
<span id="L533" class="LineNr">533 </span>
<span id="L534" class="LineNr">534 </span><span class="muRecipe">def</span> <a href='chessboard.mu.html#L534'>make-move</a> <a href='chessboard.mu.html#L67'>board</a>:<a href='chessboard.mu.html#L67'>board</a>, m:&:<a href='chessboard.mu.html#L239'>move</a><span class="muRecipe"> -> </span><a href='chessboard.mu.html#L67'>board</a>:<a href='chessboard.mu.html#L67'>board</a> [
<span id="L535" class="LineNr">535 </span> <span class="Constant">local-scope</span>
<span id="L536" class="LineNr">536 </span> <span class="Constant">load-inputs</span>
<span id="L537" class="LineNr">537 </span> from-file:num <span class="Special"><-</span> get *m, <span class="Constant">from-file:offset</span>
<span id="L538" class="LineNr">538 </span> from-rank:num <span class="Special"><-</span> get *m, <span class="Constant">from-rank:offset</span>
<span id="L539" class="LineNr">539 </span> to-file:num <span class="Special"><-</span> get *m, <span class="Constant">to-file:offset</span>
<span id="L540" class="LineNr">540 </span> to-rank:num <span class="Special"><-</span> get *m, <span class="Constant">to-rank:offset</span>
<span id="L541" class="LineNr">541 </span> from-f:&:@:char <span class="Special"><-</span> index *board, from-file
<span id="L542" class="LineNr">542 </span> to-f:&:@:char <span class="Special"><-</span> index *board, to-file
<span id="L543" class="LineNr">543 </span> src:char/square <span class="Special"><-</span> index *from-f, from-rank
<span id="L544" class="LineNr">544 </span> *to-f <span class="Special"><-</span> put-index *to-f, to-rank, src
<span id="L545" class="LineNr">545 </span> *from-f <span class="Special"><-</span> put-index *from-f, from-rank, <span class="Constant">32/space</span>
<span id="L546" class="LineNr">546 </span>]
<span id="L547" class="LineNr">547 </span>
<span id="L548" class="LineNr">548 </span><span class="muScenario">scenario</span> making-a-move [
<span id="L549" class="LineNr">549 </span> <span class="Constant">local-scope</span>
<span id="L550" class="LineNr">550 </span> assume-screen <span class="Constant">30/width</span>, <span class="Constant">12/height</span>
<span id="L551" class="LineNr">551 </span> <a href='chessboard.mu.html#L67'>board</a>:<a href='chessboard.mu.html#L67'>board</a> <span class="Special"><-</span> <a href='chessboard.mu.html#L190'>initial-position</a>
<span id="L552" class="LineNr">552 </span> <a href='chessboard.mu.html#L239'>move</a>:&:<a href='chessboard.mu.html#L239'>move</a> <span class="Special"><-</span> new <span class="Constant"><a href='chessboard.mu.html#L239'>move</a>:type</span>
<span id="L553" class="LineNr">553 </span> *move <span class="Special"><-</span> merge <span class="Constant">6/g</span>, <span class="Constant">1/'2'</span>, <span class="Constant">6/g</span>, <span class="Constant">3/'4'</span>
<span id="L554" class="LineNr">554 </span> run [
<span id="L555" class="LineNr">555 </span> <a href='chessboard.mu.html#L67'>board</a> <span class="Special"><-</span> <a href='chessboard.mu.html#L534'>make-move</a> <a href='chessboard.mu.html#L67'>board</a>, <a href='chessboard.mu.html#L239'>move</a>
<span id="L556" class="LineNr">556 </span> <a href='081print.mu.html#L16'>screen</a> <span class="Special"><-</span> print <a href='081print.mu.html#L16'>screen</a>, <a href='chessboard.mu.html#L67'>board</a>
<span id="L557" class="LineNr">557 </span> ]
<span id="L558" class="LineNr">558 </span> screen-should-contain [
<span id="L559" class="LineNr">559 </span> <span class="Comment"># 012345678901234567890123456789</span>
<span id="L560" class="LineNr">560 </span> <span class="Constant"> .8 | r n b q k b n r .</span>
<span id="L561" class="LineNr">561 </span> <span class="Constant"> .7 | p p p p p p p p .</span>
<span id="L562" class="LineNr">562 </span> <span class="Constant"> .6 | .</span>
<span id="L563" class="LineNr">563 </span> <span class="Constant"> .5 | .</span>
<span id="L564" class="LineNr">564 </span> <span class="Constant"> .4 | P .</span>
<span id="L565" class="LineNr">565 </span> <span class="Constant"> .3 | .</span>
<span id="L566" class="LineNr">566 </span> <span class="Constant"> .2 | P P P P P P P .</span>
<span id="L567" class="LineNr">567 </span> <span class="Constant"> .1 | R N B Q K B N R .</span>
<span id="L568" class="LineNr">568 </span> <span class="Constant"> . +---------------- .</span>
<span id="L569" class="LineNr">569 </span> <span class="Constant"> . a b c d e f g h .</span>
<span id="L570" class="LineNr">570 </span> <span class="Constant"> . .</span>
<span id="L571" class="LineNr">571 </span> ]
<span id="L572" class="LineNr">572 </span>]
</pre>
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