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<title>Mu - chessboard.mu</title>
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<pre>
<span class="Comment"># Chessboard program: you type in moves in algebraic notation, and it'll</span>
<span class="Comment"># display the position after each move.</span>
<span class="Comment"># recipes are mu's names for functions</span>
<span class="muRecipe">def</span> main [
open-console <span class="Comment"># take control of screen, keyboard and mouse</span>
<span class="Comment"># The chessboard recipe takes keyboard and screen objects as 'ingredients'.</span>
<span class="Comment">#</span>
<span class="Comment"># In mu it is good form (though not required) to explicitly show the</span>
<span class="Comment"># hardware you rely on.</span>
<span class="Comment">#</span>
<span class="Comment"># The chessboard also returns the same keyboard and screen objects. In mu it</span>
<span class="Comment"># is good form to not modify ingredients of a recipe unless they are also</span>
<span class="Comment"># results. Here we clearly modify both keyboard and screen, so we return</span>
<span class="Comment"># both.</span>
<span class="Comment">#</span>
<span class="Comment"># Here the console and screen are both 0, which usually indicates real</span>
<span class="Comment"># hardware rather than a fake for testing as you'll see below.</span>
chessboard <span class="Constant">0/screen</span>, <span class="Constant">0/console</span>
close-console <span class="Comment"># cleanup screen, keyboard and mouse</span>
]
<span class="SalientComment">## But enough about mu. Here's what it looks like to run the chessboard program.</span>
<span class="muScenario">scenario</span> print-board-and-read-move [
trace-until <span class="Constant">100/app</span>
<span class="Comment"># we'll make the screen really wide because the program currently prints out a long line</span>
assume-screen <span class="Constant">120/width</span>, <span class="Constant">20/height</span>
<span class="Comment"># initialize keyboard to type in a move</span>
assume-console [
type <span class="Constant">[a2-a4</span>
<span class="Constant">]</span>
]
run [
screen:address:shared:screen, console:address:shared:console<span class="Special"> <- </span>chessboard screen:address:shared:screen, console:address:shared:console
<span class="Comment"># icon for the cursor</span>
screen<span class="Special"> <- </span>print screen, <span class="Constant">9251/␣</span>
]
screen-should-contain [
<span class="Comment"># 1 2 3 4 5 6 7 8 9 10 11</span>
<span class="Comment"># 012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789</span>
<span class="Constant"> .Stupid text-mode chessboard. White pieces in uppercase; black pieces in lowercase. No checking for legal moves. .</span>
<span class="Constant"> . .</span>
<span class="Constant"> .8 | r n b q k b n r .</span>
<span class="Constant"> .7 | p p p p p p p p .</span>
<span class="Constant"> .6 | .</span>
<span class="Constant"> .5 | .</span>
<span class="Constant"> .4 | P .</span>
<span class="Constant"> .3 | .</span>
<span class="Constant"> .2 | P P P P P P P .</span>
<span class="Constant"> .1 | R N B Q K B N R .</span>
<span class="Constant"> . +---------------- .</span>
<span class="Constant"> . a b c d e f g h .</span>
<span class="Constant"> . .</span>
<span class="Constant"> .Type in your move as <from square>-<to square>. For example: 'a2-a4'. Then press <enter>. .</span>
<span class="Constant"> . .</span>
<span class="Constant"> .Hit 'q' to exit. .</span>
<span class="Constant"> . .</span>
<span class="Constant"> .move: ␣ .</span>
<span class="Constant"> . .</span>
<span class="Constant"> . .</span>
]
]
<span class="SalientComment">## Here's how 'chessboard' is implemented.</span>
<span class="muRecipe">def</span> chessboard screen:address:shared:screen, console:address:shared:console<span class="muRecipe"> -> </span>screen:address:shared:screen, console:address:shared:console [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
board:address:shared:array:address:shared:array:character<span class="Special"> <- </span>initial-position
<span class="Comment"># hook up stdin</span>
stdin:address:shared:channel<span class="Special"> <- </span>new-channel <span class="Constant">10/capacity</span>
start-running send-keys-to-channel, console, stdin, screen
<span class="Comment"># buffer lines in stdin</span>
buffered-stdin:address:shared:channel<span class="Special"> <- </span>new-channel <span class="Constant">10/capacity</span>
start-running buffer-lines, stdin, buffered-stdin
<span class="Delimiter">{</span>
msg:address:shared:array:character<span class="Special"> <- </span>new <span class="Constant">[Stupid text-mode chessboard. White pieces in uppercase; black pieces in lowercase. No checking for legal moves.</span>
<span class="Constant">]</span>
print screen, msg
cursor-to-next-line screen
print-board screen, board
cursor-to-next-line screen
msg<span class="Special"> <- </span>new <span class="Constant">[Type in your move as <from square>-<to square>. For example: 'a2-a4'. Then press <enter>.</span>
<span class="Constant">]</span>
print screen, msg
cursor-to-next-line screen
msg<span class="Special"> <- </span>new <span class="Constant">[Hit 'q' to exit.</span>
<span class="Constant">]</span>
print screen, msg
<span class="Delimiter">{</span>
cursor-to-next-line screen
msg<span class="Special"> <- </span>new <span class="Constant">[move: ]</span>
screen<span class="Special"> <- </span>print screen, msg
m:address:shared:move, quit:boolean, error:boolean<span class="Special"> <- </span>read-move buffered-stdin, screen
<span class="muControl">break-if</span> quit, <span class="Constant">+quit:label</span>
buffered-stdin<span class="Special"> <- </span>clear-channel buffered-stdin <span class="Comment"># cleanup after error. todo: test this?</span>
<span class="muControl">loop-if</span> error
<span class="Delimiter">}</span>
board<span class="Special"> <- </span>make-move board, m
screen<span class="Special"> <- </span>clear-screen screen
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
msg<span class="Special"> <- </span>copy <span class="Constant">0</span>
<span class="Constant"> +quit</span>
]
<span class="SalientComment">## a board is an array of files, a file is an array of characters (squares)</span>
<span class="muRecipe">def</span> new-board initial-position:address:shared:array:character<span class="muRecipe"> -> </span>board:address:shared:array:address:shared:array:character [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Comment"># assert(length(initial-position) == 64)</span>
len:number<span class="Special"> <- </span>length *initial-position
correct-length?:boolean<span class="Special"> <- </span>equal len, <span class="Constant">64</span>
assert correct-length?, <span class="Constant">[chessboard had incorrect size]</span>
<span class="Comment"># board is an array of pointers to files; file is an array of characters</span>
board<span class="Special"> <- </span>new <span class="Delimiter">{</span>(address shared array character): type<span class="Delimiter">}</span>, <span class="Constant">8</span>
col:number<span class="Special"> <- </span>copy <span class="Constant">0</span>
<span class="Delimiter">{</span>
done?:boolean<span class="Special"> <- </span>equal col, <span class="Constant">8</span>
<span class="muControl">break-if</span> done?
file:address:address:shared:array:character<span class="Special"> <- </span>index-address *board, col
*file<span class="Special"> <- </span>new-file initial-position, col
col<span class="Special"> <- </span>add col, <span class="Constant">1</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
]
<span class="muRecipe">def</span> new-file position:address:shared:array:character, index:number<span class="muRecipe"> -> </span>result:address:shared:array:character [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
index<span class="Special"> <- </span>multiply index, <span class="Constant">8</span>
result<span class="Special"> <- </span>new <span class="Constant">character:type</span>, <span class="Constant">8</span>
row:number<span class="Special"> <- </span>copy <span class="Constant">0</span>
<span class="Delimiter">{</span>
done?:boolean<span class="Special"> <- </span>equal row, <span class="Constant">8</span>
<span class="muControl">break-if</span> done?
dest:address:character<span class="Special"> <- </span>index-address *result, row
*dest<span class="Special"> <- </span>index *position, index
row<span class="Special"> <- </span>add row, <span class="Constant">1</span>
index<span class="Special"> <- </span>add index, <span class="Constant">1</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
]
<span class="muRecipe">def</span> print-board screen:address:shared:screen, board:address:shared:array:address:shared:array:character<span class="muRecipe"> -> </span>screen:address:shared:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
row:number<span class="Special"> <- </span>copy <span class="Constant">7</span> <span class="Comment"># start printing from the top of the board</span>
space:character<span class="Special"> <- </span>copy <span class="Constant">32/space</span>
<span class="Comment"># print each row</span>
<span class="Delimiter">{</span>
done?:boolean<span class="Special"> <- </span>lesser-than row, <span class="Constant">0</span>
<span class="muControl">break-if</span> done?
<span class="Comment"># print rank number as a legend</span>
rank:number<span class="Special"> <- </span>add row, <span class="Constant">1</span>
print-integer screen, rank
s:address:shared:array:character<span class="Special"> <- </span>new <span class="Constant">[ | ]</span>
print screen, s
<span class="Comment"># print each square in the row</span>
col:number<span class="Special"> <- </span>copy <span class="Constant">0</span>
<span class="Delimiter">{</span>
done?:boolean<span class="Special"> <- </span>equal col:number, <span class="Constant">8</span>
<span class="muControl">break-if</span> done?:boolean
f:address:shared:array:character<span class="Special"> <- </span>index *board, col
c:character<span class="Special"> <- </span>index *f, row
print screen, c
print screen, space
col<span class="Special"> <- </span>add col, <span class="Constant">1</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
row<span class="Special"> <- </span>subtract row, <span class="Constant">1</span>
cursor-to-next-line screen
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
<span class="Comment"># print file letters as legend</span>
s<span class="Special"> <- </span>new <span class="Constant">[ +----------------]</span>
print screen, s
screen<span class="Special"> <- </span>cursor-to-next-line screen
s<span class="Special"> <- </span>new <span class="Constant">[ a b c d e f g h]</span>
screen<span class="Special"> <- </span>print screen, s
screen<span class="Special"> <- </span>cursor-to-next-line screen
]
<span class="muRecipe">def</span> initial-position<span class="muRecipe"> -> </span>board:address:shared:array:address:shared:array:character [
<span class="Constant">local-scope</span>
<span class="Comment"># layout in memory (in raster order):</span>
<span class="Comment"># R P _ _ _ _ p r</span>
<span class="Comment"># N P _ _ _ _ p n</span>
<span class="Comment"># B P _ _ _ _ p b</span>
<span class="Comment"># Q P _ _ _ _ p q</span>
<span class="Comment"># K P _ _ _ _ p k</span>
<span class="Comment"># B P _ _ _ _ p B</span>
<span class="Comment"># N P _ _ _ _ p n</span>
<span class="Comment"># R P _ _ _ _ p r</span>
initial-position:address:shared:array:character<span class="Special"> <- </span>new-array <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 class="CommentedCode">#? 82/R, 80/P, 32/blank, 32/blank, 32/blank, 32/blank, 112/p, 114/r,</span>
<span class="CommentedCode">#? 78/N, 80/P, 32/blank, 32/blank, 32/blank, 32/blank, 112/p, 110/n,</span>
<span class="CommentedCode">#? 66/B, 80/P, 32/blank, 32/blank, 32/blank, 32/blank, 112/p, 98/b, </span>
<span class="CommentedCode">#? 81/Q, 80/P, 32/blank, 32/blank, 32/blank, 32/blank, 112/p, 113/q,</span>
<span class="CommentedCode">#? 75/K, 80/P, 32/blank, 32/blank, 32/blank, 32/blank, 112/p, 107/k,</span>
<span class="CommentedCode">#? 66/B, 80/P, 32/blank, 32/blank, 32/blank, 32/blank, 112/p, 98/b,</span>
<span class="CommentedCode">#? 78/N, 80/P, 32/blank, 32/blank, 32/blank, 32/blank, 112/p, 110/n,</span>
<span class="CommentedCode">#? 82/R, 80/P, 32/blank, 32/blank, 32/blank, 32/blank, 112/p, 114/r</span>
board<span class="Special"> <- </span>new-board initial-position
]
<span class="muScenario">scenario</span> printing-the-board [
assume-screen <span class="Constant">30/width</span>, <span class="Constant">12/height</span>
run [
<span class="Constant">1</span>:address:shared:array:address:shared:array:character/board<span class="Special"> <- </span>initial-position
screen:address:shared:screen<span class="Special"> <- </span>print-board screen:address:shared:screen, <span class="Constant">1</span>:address:shared:array:address:shared:array:character/board
]
screen-should-contain [
<span class="Comment"># 012345678901234567890123456789</span>
<span class="Constant"> .8 | r n b q k b n r .</span>
<span class="Constant"> .7 | p p p p p p p p .</span>
<span class="Constant"> .6 | .</span>
<span class="Constant"> .5 | .</span>
<span class="Constant"> .4 | .</span>
<span class="Constant"> .3 | .</span>
<span class="Constant"> .2 | P P P P P P P P .</span>
<span class="Constant"> .1 | R N B Q K B N R .</span>
<span class="Constant"> . +---------------- .</span>
<span class="Constant"> . a b c d e f g h .</span>
<span class="Constant"> . .</span>
<span class="Constant"> . .</span>
]
]
<span class="SalientComment">## data structure: move</span>
<span class="muData">container</span> move [
<span class="Comment"># valid range: 0-7</span>
from-file:number
from-rank:number
to-file:number
to-rank:number
]
<span class="Comment"># prints only error messages to screen</span>
<span class="muRecipe">def</span> read-move stdin:address:shared:channel, screen:address:shared:screen<span class="muRecipe"> -> </span>result:address:shared:move, quit?:boolean, error?:boolean, stdin:address:shared:channel, screen:address:shared:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
from-file:number, quit?:boolean, error?:boolean<span class="Special"> <- </span>read-file stdin, screen
<span class="muControl">return-if</span> quit?, <span class="Constant">0/dummy</span>, quit?, error?
<span class="muControl">return-if</span> error?, <span class="Constant">0/dummy</span>, quit?, error?
<span class="Comment"># construct the move object</span>
result:address:shared:move<span class="Special"> <- </span>new <span class="Constant">move:type</span>
x:address:number<span class="Special"> <- </span>get-address *result, <span class="Constant">from-file:offset</span>
*x<span class="Special"> <- </span>copy from-file
x<span class="Special"> <- </span>get-address *result, <span class="Constant">from-rank:offset</span>
*x, quit?, error?<span class="Special"> <- </span>read-rank stdin, screen
<span class="muControl">return-if</span> quit?, <span class="Constant">0/dummy</span>, quit?, error?
<span class="muControl">return-if</span> error?, <span class="Constant">0/dummy</span>, quit?, error?
error?<span class="Special"> <- </span>expect-from-channel stdin, <span class="Constant">45/dash</span>, screen
<span class="muControl">return-if</span> error?, <span class="Constant">0/dummy</span>, <span class="Constant">0/quit</span>, error?
x<span class="Special"> <- </span>get-address *result, <span class="Constant">to-file:offset</span>
*x, quit?, error?<span class="Special"> <- </span>read-file stdin, screen
<span class="muControl">return-if</span> quit?:boolean, <span class="Constant">0/dummy</span>, quit?:boolean, error?:boolean
<span class="muControl">return-if</span> error?:boolean, <span class="Constant">0/dummy</span>, quit?:boolean, error?:boolean
x:address:number<span class="Special"> <- </span>get-address *result, <span class="Constant">to-rank:offset</span>
*x, quit?, error?<span class="Special"> <- </span>read-rank stdin, screen
<span class="muControl">return-if</span> quit?, <span class="Constant">0/dummy</span>, quit?, error?
<span class="muControl">return-if</span> error?, <span class="Constant">0/dummy</span>, quit?, error?
error?<span class="Special"> <- </span>expect-from-channel stdin, <span class="Constant">10/newline</span>, screen
<span class="muControl">return-if</span> error?, <span class="Constant">0/dummy</span>, <span class="Constant">0/quit</span>, error?
<span class="muControl">return</span> result, quit?, error?
]
<span class="Comment"># valid values for file: 0-7</span>
<span class="muRecipe">def</span> read-file stdin:address:shared:channel, screen:address:shared:screen<span class="muRecipe"> -> </span>file:number, quit:boolean, error:boolean, stdin:address:shared:channel, screen:address:shared:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
c:character, stdin<span class="Special"> <- </span>read stdin
<span class="Delimiter">{</span>
q-pressed?:boolean<span class="Special"> <- </span>equal c, <span class="Constant">81/Q</span>
<span class="muControl">break-unless</span> q-pressed?
<span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">1/quit</span>, <span class="Constant">0/error</span>
<span class="Delimiter">}</span>
<span class="Delimiter">{</span>
q-pressed?<span class="Special"> <- </span>equal c, <span class="Constant">113/q</span>
<span class="muControl">break-unless</span> q-pressed?
<span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">1/quit</span>, <span class="Constant">0/error</span>
<span class="Delimiter">}</span>
<span class="Delimiter">{</span>
empty-fake-keyboard?:boolean<span class="Special"> <- </span>equal c, <span class="Constant">0/eof</span>
<span class="muControl">break-unless</span> empty-fake-keyboard?
<span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">1/quit</span>, <span class="Constant">0/error</span>
<span class="Delimiter">}</span>
<span class="Delimiter">{</span>
newline?:boolean<span class="Special"> <- </span>equal c, <span class="Constant">10/newline</span>
<span class="muControl">break-unless</span> newline?
error-message:address:shared:array:character<span class="Special"> <- </span>new <span class="Constant">[that's not enough]</span>
print screen, error-message
<span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">0/quit</span>, <span class="Constant">1/error</span>
<span class="Delimiter">}</span>
file:number<span class="Special"> <- </span>subtract c, <span class="Constant">97/a</span>
<span class="Comment"># 'a' <= file <= 'h'</span>
<span class="Delimiter">{</span>
above-min:boolean<span class="Special"> <- </span>greater-or-equal file, <span class="Constant">0</span>
<span class="muControl">break-if</span> above-min
error-message:address:shared:array:character<span class="Special"> <- </span>new <span class="Constant">[file too low: ]</span>
print screen, error-message
print screen, c
cursor-to-next-line screen
<span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">0/quit</span>, <span class="Constant">1/error</span>
<span class="Delimiter">}</span>
<span class="Delimiter">{</span>
below-max:boolean<span class="Special"> <- </span>lesser-than file, <span class="Constant">8</span>
<span class="muControl">break-if</span> below-max
error-message<span class="Special"> <- </span>new <span class="Constant">[file too high: ]</span>
print screen, error-message
print screen, c
<span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">0/quit</span>, <span class="Constant">1/error</span>
<span class="Delimiter">}</span>
<span class="muControl">return</span> file, <span class="Constant">0/quit</span>, <span class="Constant">0/error</span>
]
<span class="Comment"># valid values: 0-7, -1 (quit), -2 (error)</span>
<span class="muRecipe">def</span> read-rank stdin:address:shared:channel, screen:address:shared:screen<span class="muRecipe"> -> </span>rank:number, quit?:boolean, error?:boolean, stdin:address:shared:channel, screen:address:shared:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
c:character, stdin<span class="Special"> <- </span>read stdin
<span class="Delimiter">{</span>
q-pressed?:boolean<span class="Special"> <- </span>equal c, <span class="Constant">8/Q</span>
<span class="muControl">break-unless</span> q-pressed?
<span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">1/quit</span>, <span class="Constant">0/error</span>
<span class="Delimiter">}</span>
<span class="Delimiter">{</span>
q-pressed?<span class="Special"> <- </span>equal c, <span class="Constant">113/q</span>
<span class="muControl">break-unless</span> q-pressed?
<span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">1/quit</span>, <span class="Constant">0/error</span>
<span class="Delimiter">}</span>
<span class="Delimiter">{</span>
newline?:boolean<span class="Special"> <- </span>equal c, <span class="Constant">10</span> <span class="Comment"># newline</span>
<span class="muControl">break-unless</span> newline?
error-message:address:shared:array:character<span class="Special"> <- </span>new <span class="Constant">[that's not enough]</span>
print screen, error-message
<span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">0/quit</span>, <span class="Constant">1/error</span>
<span class="Delimiter">}</span>
rank:number<span class="Special"> <- </span>subtract c, <span class="Constant">49/'1'</span>
<span class="Comment"># assert'1' <= rank <= '8'</span>
<span class="Delimiter">{</span>
above-min:boolean<span class="Special"> <- </span>greater-or-equal rank, <span class="Constant">0</span>
<span class="muControl">break-if</span> above-min
error-message<span class="Special"> <- </span>new <span class="Constant">[rank too low: ]</span>
print screen, error-message
print screen, c
<span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">0/quit</span>, <span class="Constant">1/error</span>
<span class="Delimiter">}</span>
<span class="Delimiter">{</span>
below-max:boolean<span class="Special"> <- </span>lesser-or-equal rank, <span class="Constant">7</span>
<span class="muControl">break-if</span> below-max
error-message<span class="Special"> <- </span>new <span class="Constant">[rank too high: ]</span>
print screen, error-message
print screen, c
<span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">0/quit</span>, <span class="Constant">1/error</span>
<span class="Delimiter">}</span>
<span class="muControl">return</span> rank, <span class="Constant">0/quit</span>, <span class="Constant">0/error</span>
]
<span class="Comment"># read a character from the given channel and check that it's what we expect</span>
<span class="Comment"># return true on error</span>
<span class="muRecipe">def</span> expect-from-channel stdin:address:shared:channel, expected:character, screen:address:shared:screen<span class="muRecipe"> -> </span>result:boolean, stdin:address:shared:channel, screen:address:shared:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
c:character, stdin<span class="Special"> <- </span>read stdin
<span class="Delimiter">{</span>
match?:boolean<span class="Special"> <- </span>equal c, expected
<span class="muControl">break-if</span> match?
s:address:shared:array:character<span class="Special"> <- </span>new <span class="Constant">[expected character not found]</span>
print screen, s
<span class="Delimiter">}</span>
result<span class="Special"> <- </span>not match?
]
<span class="muScenario">scenario</span> read-move-blocking [
assume-screen <span class="Constant">20/width</span>, <span class="Constant">2/height</span>
run [
<span class="Constant">1</span>:address:shared:channel<span class="Special"> <- </span>new-channel <span class="Constant">2</span>
<span class="Constant">2</span>:number/routine<span class="Special"> <- </span>start-running read-move, <span class="Constant">1</span>:address:shared:channel, screen:address:shared:screen
<span class="Comment"># 'read-move' is waiting for input</span>
wait-for-routine <span class="Constant">2</span>:number
<span class="Constant">3</span>:number<span class="Special"> <- </span>routine-state <span class="Constant">2</span>:number/id
<span class="Constant">4</span>:boolean/waiting?<span class="Special"> <- </span>equal <span class="Constant">3</span>:number/routine-state, <span class="Constant">3/waiting</span>
assert <span class="Constant">4</span>:boolean/waiting?, [
F read-move-blocking: routine failed to pause <span class="muRecipe">after</span> coming up (<span class="muRecipe">before</span> any keys were pressed)]
<span class="Comment"># press 'a'</span>
<span class="Constant">1</span>:address:shared:channel<span class="Special"> <- </span>write <span class="Constant">1</span>:address:shared:channel, <span class="Constant">97/a</span>
restart <span class="Constant">2</span>:number/routine
<span class="Comment"># 'read-move' still waiting for input</span>
wait-for-routine <span class="Constant">2</span>:number
<span class="Constant">3</span>:number<span class="Special"> <- </span>routine-state <span class="Constant">2</span>:number/id
<span class="Constant">4</span>:boolean/waiting?<span class="Special"> <- </span>equal <span class="Constant">3</span>:number/routine-state, <span class="Constant">3/waiting</span>
assert <span class="Constant">4</span>:boolean/waiting?, [
F read-move-blocking: routine failed to pause <span class="muRecipe">after</span> rank 'a']
<span class="Comment"># press '2'</span>
<span class="Constant">1</span>:address:shared:channel<span class="Special"> <- </span>write <span class="Constant">1</span>:address:shared:channel, <span class="Constant">50/'2'</span>
restart <span class="Constant">2</span>:number/routine
<span class="Comment"># 'read-move' still waiting for input</span>
wait-for-routine <span class="Constant">2</span>:number
<span class="Constant">3</span>:number<span class="Special"> <- </span>routine-state <span class="Constant">2</span>:number/id
<span class="Constant">4</span>:boolean/waiting?<span class="Special"> <- </span>equal <span class="Constant">3</span>:number/routine-state, <span class="Constant">3/waiting</span>
assert <span class="Constant">4</span>:boolean/waiting?, [
F read-move-blocking: routine failed to pause <span class="muRecipe">after</span> file 'a2']
<span class="Comment"># press '-'</span>
<span class="Constant">1</span>:address:shared:channel<span class="Special"> <- </span>write <span class="Constant">1</span>:address:shared:channel, <span class="Constant">45/'-'</span>
restart <span class="Constant">2</span>:number/routine
<span class="Comment"># 'read-move' still waiting for input</span>
wait-for-routine <span class="Constant">2</span>:number
<span class="Constant">3</span>:number<span class="Special"> <- </span>routine-state <span class="Constant">2</span>:number
<span class="Constant">4</span>:boolean/waiting?<span class="Special"> <- </span>equal <span class="Constant">3</span>:number/routine-state, <span class="Constant">3/waiting</span>
assert <span class="Constant">4</span>:boolean/waiting?/routine-state, [
F read-move-blocking: routine failed to pause <span class="muRecipe">after</span> hyphen 'a2-']
<span class="Comment"># press 'a'</span>
<span class="Constant">1</span>:address:shared:channel<span class="Special"> <- </span>write <span class="Constant">1</span>:address:shared:channel, <span class="Constant">97/a</span>
restart <span class="Constant">2</span>:number/routine
<span class="Comment"># 'read-move' still waiting for input</span>
wait-for-routine <span class="Constant">2</span>:number
<span class="Constant">3</span>:number<span class="Special"> <- </span>routine-state <span class="Constant">2</span>:number
<span class="Constant">4</span>:boolean/waiting?<span class="Special"> <- </span>equal <span class="Constant">3</span>:number/routine-state, <span class="Constant">3/waiting</span>
assert <span class="Constant">4</span>:boolean/waiting?/routine-state, [
F read-move-blocking: routine failed to pause <span class="muRecipe">after</span> rank 'a2-a']
<span class="Comment"># press '4'</span>
<span class="Constant">1</span>:address:shared:channel<span class="Special"> <- </span>write <span class="Constant">1</span>:address:shared:channel, <span class="Constant">52/'4'</span>
restart <span class="Constant">2</span>:number/routine
<span class="Comment"># 'read-move' still waiting for input</span>
wait-for-routine <span class="Constant">2</span>:number
<span class="Constant">3</span>:number<span class="Special"> <- </span>routine-state <span class="Constant">2</span>:number
<span class="Constant">4</span>:boolean/waiting?<span class="Special"> <- </span>equal <span class="Constant">3</span>:number/routine-state, <span class="Constant">3/waiting</span>
assert <span class="Constant">4</span>:boolean/waiting?, [
F read-move-blocking: routine failed to pause <span class="muRecipe">after</span> file 'a2-a4']
<span class="Comment"># press 'newline'</span>
<span class="Constant">1</span>:address:shared:channel<span class="Special"> <- </span>write <span class="Constant">1</span>:address:shared:channel, <span class="Constant">10</span> <span class="Comment"># newline</span>
restart <span class="Constant">2</span>:number/routine
<span class="Comment"># 'read-move' now completes</span>
wait-for-routine <span class="Constant">2</span>:number
<span class="Constant">3</span>:number<span class="Special"> <- </span>routine-state <span class="Constant">2</span>:number
<span class="Constant">4</span>:boolean/completed?<span class="Special"> <- </span>equal <span class="Constant">3</span>:number/routine-state, <span class="Constant">1/completed</span>
assert <span class="Constant">4</span>:boolean/completed?, [
F read-move-blocking: routine failed to terminate on newline]
trace <span class="Constant">1</span>, <span class="Constant">[test]</span>, <span class="Constant">[reached end]</span>
]
trace-should-contain [
test: reached end
]
]
<span class="muScenario">scenario</span> read-move-quit [
assume-screen <span class="Constant">20/width</span>, <span class="Constant">2/height</span>
run [
<span class="Constant">1</span>:address:shared:channel<span class="Special"> <- </span>new-channel <span class="Constant">2</span>
<span class="Constant">2</span>:number/routine<span class="Special"> <- </span>start-running read-move, <span class="Constant">1</span>:address:shared:channel, screen:address:shared:screen
<span class="Comment"># 'read-move' is waiting for input</span>
wait-for-routine <span class="Constant">2</span>:number
<span class="Constant">3</span>:number<span class="Special"> <- </span>routine-state <span class="Constant">2</span>:number/id
<span class="Constant">4</span>:boolean/waiting?<span class="Special"> <- </span>equal <span class="Constant">3</span>:number/routine-state, <span class="Constant">3/waiting</span>
assert <span class="Constant">4</span>:boolean/waiting?, [
F read-move-quit: routine failed to pause <span class="muRecipe">after</span> coming up (<span class="muRecipe">before</span> any keys were pressed)]
<span class="Comment"># press 'q'</span>
<span class="Constant">1</span>:address:shared:channel<span class="Special"> <- </span>write <span class="Constant">1</span>:address:shared:channel, <span class="Constant">113/q</span>
restart <span class="Constant">2</span>:number/routine
<span class="Comment"># 'read-move' completes</span>
wait-for-routine <span class="Constant">2</span>:number
<span class="Constant">3</span>:number<span class="Special"> <- </span>routine-state <span class="Constant">2</span>:number/id
<span class="Constant">4</span>:boolean/completed?<span class="Special"> <- </span>equal <span class="Constant">3</span>:number/routine-state, <span class="Constant">1/completed</span>
assert <span class="Constant">4</span>:boolean/completed?, [
F read-move-quit: routine failed to terminate on 'q']
trace <span class="Constant">1</span>, <span class="Constant">[test]</span>, <span class="Constant">[reached end]</span>
]
trace-should-contain [
test: reached end
]
]
<span class="muScenario">scenario</span> read-move-illegal-file [
assume-screen <span class="Constant">20/width</span>, <span class="Constant">2/height</span>
run [
<span class="Constant">1</span>:address:shared:channel<span class="Special"> <- </span>new-channel <span class="Constant">2</span>
<span class="Constant">2</span>:number/routine<span class="Special"> <- </span>start-running read-move, <span class="Constant">1</span>:address:shared:channel, screen:address:shared:screen
<span class="Comment"># 'read-move' is waiting for input</span>
wait-for-routine <span class="Constant">2</span>:number
<span class="Constant">3</span>:number<span class="Special"> <- </span>routine-state <span class="Constant">2</span>:number/id
<span class="Constant">4</span>:boolean/waiting?<span class="Special"> <- </span>equal <span class="Constant">3</span>:number/routine-state, <span class="Constant">3/waiting</span>
assert <span class="Constant">4</span>:boolean/waiting?, [
F read-move-file: routine failed to pause <span class="muRecipe">after</span> coming up (<span class="muRecipe">before</span> any keys were pressed)]
<span class="Constant">1</span>:address:shared:channel<span class="Special"> <- </span>write <span class="Constant">1</span>:address:shared:channel, <span class="Constant">50/'2'</span>
restart <span class="Constant">2</span>:number/routine
wait-for-routine <span class="Constant">2</span>:number
]
screen-should-contain [
<span class="Constant"> .file too low: 2 .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> read-move-illegal-rank [
assume-screen <span class="Constant">20/width</span>, <span class="Constant">2/height</span>
run [
<span class="Constant">1</span>:address:shared:channel<span class="Special"> <- </span>new-channel <span class="Constant">2</span>
<span class="Constant">2</span>:number/routine<span class="Special"> <- </span>start-running read-move, <span class="Constant">1</span>:address:shared:channel, screen:address:shared:screen
<span class="Comment"># 'read-move' is waiting for input</span>
wait-for-routine <span class="Constant">2</span>:number
<span class="Constant">3</span>:number<span class="Special"> <- </span>routine-state <span class="Constant">2</span>:number/id
<span class="Constant">4</span>:boolean/waiting?<span class="Special"> <- </span>equal <span class="Constant">3</span>:number/routine-state, <span class="Constant">3/waiting</span>
assert <span class="Constant">4</span>:boolean/waiting?, [
F read-move-file: routine failed to pause <span class="muRecipe">after</span> coming up (<span class="muRecipe">before</span> any keys were pressed)]
<span class="Constant">1</span>:address:shared:channel<span class="Special"> <- </span>write <span class="Constant">1</span>:address:shared:channel, <span class="Constant">97/a</span>
<span class="Constant">1</span>:address:shared:channel<span class="Special"> <- </span>write <span class="Constant">1</span>:address:shared:channel, <span class="Constant">97/a</span>
restart <span class="Constant">2</span>:number/routine
wait-for-routine <span class="Constant">2</span>:number
]
screen-should-contain [
<span class="Constant"> .rank too high: a .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> read-move-empty [
assume-screen <span class="Constant">20/width</span>, <span class="Constant">2/height</span>
run [
<span class="Constant">1</span>:address:shared:channel<span class="Special"> <- </span>new-channel <span class="Constant">2</span>
<span class="Constant">2</span>:number/routine<span class="Special"> <- </span>start-running read-move, <span class="Constant">1</span>:address:shared:channel, screen:address:shared:screen
<span class="Comment"># 'read-move' is waiting for input</span>
wait-for-routine <span class="Constant">2</span>:number
<span class="Constant">3</span>:number<span class="Special"> <- </span>routine-state <span class="Constant">2</span>:number/id
<span class="Constant">4</span>:boolean/waiting?<span class="Special"> <- </span>equal <span class="Constant">3</span>:number/routine-state, <span class="Constant">3/waiting</span>
assert <span class="Constant">4</span>:boolean/waiting?, [
F read-move-file: routine failed to pause <span class="muRecipe">after</span> coming up (<span class="muRecipe">before</span> any keys were pressed)]
<span class="Constant">1</span>:address:shared:channel<span class="Special"> <- </span>write <span class="Constant">1</span>:address:shared:channel, <span class="Constant">10/newline</span>
<span class="Constant">1</span>:address:shared:channel<span class="Special"> <- </span>write <span class="Constant">1</span>:address:shared:channel, <span class="Constant">97/a</span>
restart <span class="Constant">2</span>:number/routine
wait-for-routine <span class="Constant">2</span>:number
]
screen-should-contain [
<span class="Constant"> .that's not enough .</span>
<span class="Constant"> . .</span>
]
]
<span class="muRecipe">def</span> make-move board:address:shared:array:address:shared:array:character, m:address:shared:move<span class="muRecipe"> -> </span>board:address:shared:array:address:shared:array:character [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
from-file:number<span class="Special"> <- </span>get *m, <span class="Constant">from-file:offset</span>
from-rank:number<span class="Special"> <- </span>get *m, <span class="Constant">from-rank:offset</span>
to-file:number<span class="Special"> <- </span>get *m, <span class="Constant">to-file:offset</span>
to-rank:number<span class="Special"> <- </span>get *m, <span class="Constant">to-rank:offset</span>
f:address:shared:array:character<span class="Special"> <- </span>index *board, from-file
src:address:character/square<span class="Special"> <- </span>index-address *f, from-rank
f<span class="Special"> <- </span>index *board, to-file
dest:address:character/square<span class="Special"> <- </span>index-address *f, to-rank
*dest<span class="Special"> <- </span>copy *src
*src<span class="Special"> <- </span>copy <span class="Constant">32/space</span>
]
<span class="muScenario">scenario</span> making-a-move [
assume-screen <span class="Constant">30/width</span>, <span class="Constant">12/height</span>
run [
<span class="Constant">2</span>:address:shared:array:address:shared:array:character/board<span class="Special"> <- </span>initial-position
<span class="Constant">3</span>:address:shared:move<span class="Special"> <- </span>new <span class="Constant">move:type</span>
<span class="Constant">4</span>:address:number<span class="Special"> <- </span>get-address *<span class="Constant">3</span>:address:shared:move, <span class="Constant">from-file:offset</span>
*<span class="Constant">4</span>:address:number<span class="Special"> <- </span>copy <span class="Constant">6/g</span>
<span class="Constant">5</span>:address:number<span class="Special"> <- </span>get-address *<span class="Constant">3</span>:address:shared:move, <span class="Constant">from-rank:offset</span>
*<span class="Constant">5</span>:address:number<span class="Special"> <- </span>copy <span class="Constant">1/'2'</span>
<span class="Constant">6</span>:address:number<span class="Special"> <- </span>get-address *<span class="Constant">3</span>:address:shared:move, <span class="Constant">to-file:offset</span>
*<span class="Constant">6</span>:address:number<span class="Special"> <- </span>copy <span class="Constant">6/g</span>
<span class="Constant">7</span>:address:number<span class="Special"> <- </span>get-address *<span class="Constant">3</span>:address:shared:move, <span class="Constant">to-rank:offset</span>
*<span class="Constant">7</span>:address:number<span class="Special"> <- </span>copy <span class="Constant">3/'4'</span>
<span class="Constant">2</span>:address:shared:array:address:shared:array:character/board<span class="Special"> <- </span>make-move <span class="Constant">2</span>:address:shared:array:address:shared:array:character/board, <span class="Constant">3</span>:address:shared:move
screen:address:shared:screen<span class="Special"> <- </span>print-board screen:address:shared:screen, <span class="Constant">2</span>:address:shared:array:address:shared:array:character/board
]
screen-should-contain [
<span class="Comment"># 012345678901234567890123456789</span>
<span class="Constant"> .8 | r n b q k b n r .</span>
<span class="Constant"> .7 | p p p p p p p p .</span>
<span class="Constant"> .6 | .</span>
<span class="Constant"> .5 | .</span>
<span class="Constant"> .4 | P .</span>
<span class="Constant"> .3 | .</span>
<span class="Constant"> .2 | P P P P P P P .</span>
<span class="Constant"> .1 | R N B Q K B N R .</span>
<span class="Constant"> . +---------------- .</span>
<span class="Constant"> . a b c d e f g h .</span>
<span class="Constant"> . .</span>
]
]
</pre>
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