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| author | Kartik K. Agaram <vc@akkartik.com> | 2021-07-16 08:38:43 -0700 |
|---|---|---|
| committer | Kartik K. Agaram <vc@akkartik.com> | 2021-07-16 08:38:43 -0700 |
| commit | 78357b8852626b510527f3b8d770a7dd8956fcc7 (patch) | |
| tree | 5e38d0f616ab151e66618090487b41dd2fc348e0 /html/linux/arith.mu.html | |
| parent | 44d26b77c45668c9b0c99894a4294cec004361fe (diff) | |
| download | mu-78357b8852626b510527f3b8d770a7dd8956fcc7.tar.gz | |
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Diffstat (limited to 'html/linux/arith.mu.html')
| -rw-r--r-- | html/linux/arith.mu.html | 326 |
1 files changed, 0 insertions, 326 deletions
diff --git a/html/linux/arith.mu.html b/html/linux/arith.mu.html deleted file mode 100644 index 7cd2e5c9..00000000 --- a/html/linux/arith.mu.html +++ /dev/null @@ -1,326 +0,0 @@ -<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> -<html> -<head> -<meta http-equiv="content-type" content="text/html; charset=UTF-8"> -<title>Mu - linux/arith.mu</title> -<meta name="Generator" content="Vim/8.1"> -<meta name="plugin-version" content="vim8.1_v1"> -<meta name="syntax" content="none"> -<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy="> -<meta name="colorscheme" content="minimal-light"> -<style type="text/css"> -<!-- -pre { white-space: pre-wrap; font-family: monospace; color: #000000; background-color: #ffffd7; } -body { font-size:12pt; font-family: monospace; color: #000000; background-color: #ffffd7; } -a { color:inherit; } -* { font-size:12pt; font-size: 1em; } -.PreProc { color: #c000c0; } -.muRegEdx { color: #af5f00; } -.Special { color: #ff6060; } -.LineNr { } -.Constant { color: #008787; } -.muRegEbx { color: #5f00ff; } -.muRegEsi { color: #005faf; } -.muRegEdi { color: #00af00; } -.muRegEcx { color: #870000; } -.Delimiter { color: #c000c0; } -.muFunction { color: #af5f00; text-decoration: underline; } -.CommentedCode { color: #8a8a8a; } -.muComment { color: #005faf; } ---> -</style> - -<script type='text/javascript'> -<!-- - -/* function to open any folds containing a jumped-to line before jumping to it */ -function JumpToLine() -{ - var lineNum; - lineNum = window.location.hash; - lineNum = lineNum.substr(1); /* strip off '#' */ - - if (lineNum.indexOf('L') == -1) { - lineNum = 'L'+lineNum; - } - var lineElem = document.getElementById(lineNum); - /* Always jump to new location even if the line was hidden inside a fold, or - * we corrected the raw number to a line ID. - */ - if (lineElem) { - lineElem.scrollIntoView(true); - } - return true; -} -if ('onhashchange' in window) { - window.onhashchange = JumpToLine; -} - ---> -</script> -</head> -<body onload='JumpToLine();'> -<a href='https://github.com/akkartik/mu/blob/main/linux/arith.mu'>https://github.com/akkartik/mu/blob/main/linux/arith.mu</a> -<pre id='vimCodeElement'> -<span id="L1" class="LineNr"> 1 </span><span class="muComment"># Integer arithmetic using conventional precedence.</span> -<span id="L2" class="LineNr"> 2 </span><span class="muComment">#</span> -<span id="L3" class="LineNr"> 3 </span><span class="muComment"># Follows part 2 of Jack Crenshaw's "Let's build a compiler!"</span> -<span id="L4" class="LineNr"> 4 </span><span class="muComment"># <a href="https://compilers.iecc.com/crenshaw">https://compilers.iecc.com/crenshaw</a></span> -<span id="L5" class="LineNr"> 5 </span><span class="muComment">#</span> -<span id="L6" class="LineNr"> 6 </span><span class="muComment"># Limitations:</span> -<span id="L7" class="LineNr"> 7 </span><span class="muComment"># No division yet.</span> -<span id="L8" class="LineNr"> 8 </span><span class="muComment">#</span> -<span id="L9" class="LineNr"> 9 </span><span class="muComment"># To build:</span> -<span id="L10" class="LineNr"> 10 </span><span class="muComment"># $ ./translate arith.mu</span> -<span id="L11" class="LineNr"> 11 </span><span class="muComment">#</span> -<span id="L12" class="LineNr"> 12 </span><span class="muComment"># Example session:</span> -<span id="L13" class="LineNr"> 13 </span><span class="muComment"># $ ./a.elf</span> -<span id="L14" class="LineNr"> 14 </span><span class="muComment"># press ctrl-c or ctrl-d to exit</span> -<span id="L15" class="LineNr"> 15 </span><span class="muComment"># > 1</span> -<span id="L16" class="LineNr"> 16 </span><span class="muComment"># 1</span> -<span id="L17" class="LineNr"> 17 </span><span class="muComment"># > 1+1</span> -<span id="L18" class="LineNr"> 18 </span><span class="muComment"># 2</span> -<span id="L19" class="LineNr"> 19 </span><span class="muComment"># > 1 + 1</span> -<span id="L20" class="LineNr"> 20 </span><span class="muComment"># 2</span> -<span id="L21" class="LineNr"> 21 </span><span class="muComment"># > 1+2 +3</span> -<span id="L22" class="LineNr"> 22 </span><span class="muComment"># 6</span> -<span id="L23" class="LineNr"> 23 </span><span class="muComment"># > 1+2 *3</span> -<span id="L24" class="LineNr"> 24 </span><span class="muComment"># 7</span> -<span id="L25" class="LineNr"> 25 </span><span class="muComment"># > (1+2) *3</span> -<span id="L26" class="LineNr"> 26 </span><span class="muComment"># 9</span> -<span id="L27" class="LineNr"> 27 </span><span class="muComment"># > 1 + 3*4</span> -<span id="L28" class="LineNr"> 28 </span><span class="muComment"># 13</span> -<span id="L29" class="LineNr"> 29 </span><span class="muComment"># > ^D</span> -<span id="L30" class="LineNr"> 30 </span><span class="muComment"># $</span> -<span id="L31" class="LineNr"> 31 </span><span class="muComment">#</span> -<span id="L32" class="LineNr"> 32 </span><span class="muComment"># Error handling is non-existent. This is just a prototype.</span> -<span id="L33" class="LineNr"> 33 </span> -<span id="L34" class="LineNr"> 34 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='arith.mu.html#L34'>main</a></span><span class="PreProc"> -> </span>_/<span class="muRegEbx">ebx</span>: int <span class="Delimiter">{</span> -<span id="L35" class="LineNr"> 35 </span> <a href='305keyboard.subx.html#L6'>enable-keyboard-immediate-mode</a> -<span id="L36" class="LineNr"> 36 </span> <span class="PreProc">var</span> look/<span class="muRegEsi">esi</span>: grapheme <span class="Special"><-</span> copy <span class="Constant">0</span> <span class="muComment"># lookahead</span> -<span id="L37" class="LineNr"> 37 </span> <span class="PreProc">var</span> n/eax: int <span class="Special"><-</span> copy <span class="Constant">0</span> <span class="muComment"># result of each expression</span> -<span id="L38" class="LineNr"> 38 </span> <a href='405screen.mu.html#L169'>print-string</a> <span class="Constant">0</span>/screen, <span class="Constant">"press ctrl-c or ctrl-d to exit\n"</span> -<span id="L39" class="LineNr"> 39 </span> <span class="muComment"># read-eval-print loop</span> -<span id="L40" class="LineNr"> 40 </span> <span class="Delimiter">{</span> -<span id="L41" class="LineNr"> 41 </span> <span class="muComment"># print prompt</span> -<span id="L42" class="LineNr"> 42 </span> <a href='405screen.mu.html#L169'>print-string</a> <span class="Constant">0</span>/screen, <span class="Constant">"> "</span> -<span id="L43" class="LineNr"> 43 </span> <span class="muComment"># read and eval</span> -<span id="L44" class="LineNr"> 44 </span> n, look <span class="Special"><-</span> <a href='arith.mu.html#L58'>simplify</a> <span class="muComment"># we explicitly thread 'look' everywhere</span> -<span id="L45" class="LineNr"> 45 </span> <span class="muComment"># if (look == 0) break</span> -<span id="L46" class="LineNr"> 46 </span> compare look, <span class="Constant">0</span> -<span id="L47" class="LineNr"> 47 </span> <span class="PreProc">break-if-=</span> -<span id="L48" class="LineNr"> 48 </span> <span class="muComment"># print</span> -<span id="L49" class="LineNr"> 49 </span> <a href='405screen.mu.html#L484'>print-int32-decimal</a> <span class="Constant">0</span>/screen, n -<span id="L50" class="LineNr"> 50 </span> <a href='405screen.mu.html#L169'>print-string</a> <span class="Constant">0</span>/screen, <span class="Constant">"\n"</span> -<span id="L51" class="LineNr"> 51 </span> <span class="muComment">#</span> -<span id="L52" class="LineNr"> 52 </span> <span class="PreProc">loop</span> -<span id="L53" class="LineNr"> 53 </span> <span class="Delimiter">}</span> -<span id="L54" class="LineNr"> 54 </span> <a href='305keyboard.subx.html#L72'>enable-keyboard-type-mode</a> -<span id="L55" class="LineNr"> 55 </span> <span class="PreProc">return</span> <span class="Constant">0</span> -<span id="L56" class="LineNr"> 56 </span><span class="Delimiter">}</span> -<span id="L57" class="LineNr"> 57 </span> -<span id="L58" class="LineNr"> 58 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='arith.mu.html#L58'>simplify</a></span><span class="PreProc"> -> </span>_/eax: int, _/<span class="muRegEsi">esi</span>: grapheme <span class="Delimiter">{</span> -<span id="L59" class="LineNr"> 59 </span> <span class="muComment"># prime the pump</span> -<span id="L60" class="LineNr"> 60 </span> <span class="PreProc">var</span> look/<span class="muRegEsi">esi</span>: grapheme <span class="Special"><-</span> <a href='arith.mu.html#L248'>get-char</a> -<span id="L61" class="LineNr"> 61 </span> <span class="muComment"># do it</span> -<span id="L62" class="LineNr"> 62 </span> <span class="PreProc">var</span> result/eax: int <span class="Special"><-</span> copy <span class="Constant">0</span> -<span id="L63" class="LineNr"> 63 </span> result, look <span class="Special"><-</span> <a href='arith.mu.html#L67'>expression</a> look -<span id="L64" class="LineNr"> 64 </span> <span class="PreProc">return</span> result, look -<span id="L65" class="LineNr"> 65 </span><span class="Delimiter">}</span> -<span id="L66" class="LineNr"> 66 </span> -<span id="L67" class="LineNr"> 67 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='arith.mu.html#L67'>expression</a></span> _look: grapheme<span class="PreProc"> -> </span>_/eax: int, _/<span class="muRegEsi">esi</span>: grapheme <span class="Delimiter">{</span> -<span id="L68" class="LineNr"> 68 </span> <span class="PreProc">var</span> look/<span class="muRegEsi">esi</span>: grapheme <span class="Special"><-</span> copy _look -<span id="L69" class="LineNr"> 69 </span> <span class="muComment"># read arg</span> -<span id="L70" class="LineNr"> 70 </span> <span class="PreProc">var</span> result/eax: int <span class="Special"><-</span> copy <span class="Constant">0</span> -<span id="L71" class="LineNr"> 71 </span> result, look <span class="Special"><-</span> <a href='arith.mu.html#L112'>term</a> look -<span id="L72" class="LineNr"> 72 </span> $expression:<span class="PreProc">loop</span>: <span class="Delimiter">{</span> -<span id="L73" class="LineNr"> 73 </span> <span class="muComment"># while next non-space char in ['+', '-']</span> -<span id="L74" class="LineNr"> 74 </span> look <span class="Special"><-</span> <a href='arith.mu.html#L237'>skip-spaces</a> look -<span id="L75" class="LineNr"> 75 </span> <span class="Delimiter">{</span> -<span id="L76" class="LineNr"> 76 </span> <span class="PreProc">var</span> continue?/eax: boolean <span class="Special"><-</span> <a href='arith.mu.html#L191'>add-or-sub?</a> look -<span id="L77" class="LineNr"> 77 </span> compare continue?, <span class="Constant">0</span>/false -<span id="L78" class="LineNr"> 78 </span> <span class="PreProc">break-if-=</span> $expression:<span class="PreProc">loop</span> -<span id="L79" class="LineNr"> 79 </span> <span class="Delimiter">}</span> -<span id="L80" class="LineNr"> 80 </span> <span class="muComment"># read operator</span> -<span id="L81" class="LineNr"> 81 </span> <span class="PreProc">var</span> op/<span class="muRegEcx">ecx</span>: grapheme <span class="Special"><-</span> copy <span class="Constant">0</span> -<span id="L82" class="LineNr"> 82 </span> op, look <span class="Special"><-</span> operator look -<span id="L83" class="LineNr"> 83 </span> <span class="muComment"># read next arg</span> -<span id="L84" class="LineNr"> 84 </span> <span class="PreProc">var</span> second/<span class="muRegEdx">edx</span>: int <span class="Special"><-</span> copy <span class="Constant">0</span> -<span id="L85" class="LineNr"> 85 </span> look <span class="Special"><-</span> <a href='arith.mu.html#L237'>skip-spaces</a> look -<span id="L86" class="LineNr"> 86 </span> <span class="Delimiter">{</span> -<span id="L87" class="LineNr"> 87 </span> <span class="PreProc">var</span> tmp/eax: int <span class="Special"><-</span> copy <span class="Constant">0</span> -<span id="L88" class="LineNr"> 88 </span> tmp, look <span class="Special"><-</span> <a href='arith.mu.html#L112'>term</a> look -<span id="L89" class="LineNr"> 89 </span> second <span class="Special"><-</span> copy tmp -<span id="L90" class="LineNr"> 90 </span> <span class="Delimiter">}</span> -<span id="L91" class="LineNr"> 91 </span> <span class="muComment"># reduce</span> -<span id="L92" class="LineNr"> 92 </span> $expression:perform-op: <span class="Delimiter">{</span> -<span id="L93" class="LineNr"> 93 </span> <span class="Delimiter">{</span> -<span id="L94" class="LineNr"> 94 </span> compare op, <span class="Constant">0x2b</span>/+ -<span id="L95" class="LineNr"> 95 </span> <span class="PreProc">break-if-!=</span> -<span id="L96" class="LineNr"> 96 </span> result <span class="Special"><-</span> add second -<span id="L97" class="LineNr"> 97 </span> <span class="PreProc">break</span> $expression:perform-op -<span id="L98" class="LineNr"> 98 </span> <span class="Delimiter">}</span> -<span id="L99" class="LineNr"> 99 </span> <span class="Delimiter">{</span> -<span id="L100" class="LineNr">100 </span> compare op, <span class="Constant">0x2d</span>/minus -<span id="L101" class="LineNr">101 </span> <span class="PreProc">break-if-!=</span> -<span id="L102" class="LineNr">102 </span> result <span class="Special"><-</span> subtract second -<span id="L103" class="LineNr">103 </span> <span class="PreProc">break</span> $expression:perform-op -<span id="L104" class="LineNr">104 </span> <span class="Delimiter">}</span> -<span id="L105" class="LineNr">105 </span> <span class="Delimiter">}</span> -<span id="L106" class="LineNr">106 </span> <span class="PreProc">loop</span> -<span id="L107" class="LineNr">107 </span> <span class="Delimiter">}</span> -<span id="L108" class="LineNr">108 </span> look <span class="Special"><-</span> <a href='arith.mu.html#L237'>skip-spaces</a> look -<span id="L109" class="LineNr">109 </span> <span class="PreProc">return</span> result, look -<span id="L110" class="LineNr">110 </span><span class="Delimiter">}</span> -<span id="L111" class="LineNr">111 </span> -<span id="L112" class="LineNr">112 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='arith.mu.html#L112'>term</a></span> _look: grapheme<span class="PreProc"> -> </span>_/eax: int, _/<span class="muRegEsi">esi</span>: grapheme <span class="Delimiter">{</span> -<span id="L113" class="LineNr">113 </span> <span class="PreProc">var</span> look/<span class="muRegEsi">esi</span>: grapheme <span class="Special"><-</span> copy _look -<span id="L114" class="LineNr">114 </span> <span class="muComment"># read arg</span> -<span id="L115" class="LineNr">115 </span> look <span class="Special"><-</span> <a href='arith.mu.html#L237'>skip-spaces</a> look -<span id="L116" class="LineNr">116 </span> <span class="PreProc">var</span> result/eax: int <span class="Special"><-</span> copy <span class="Constant">0</span> -<span id="L117" class="LineNr">117 </span> result, look <span class="Special"><-</span> <a href='arith.mu.html#L157'>factor</a> look -<span id="L118" class="LineNr">118 </span> $term:<span class="PreProc">loop</span>: <span class="Delimiter">{</span> -<span id="L119" class="LineNr">119 </span> <span class="muComment"># while next non-space char in ['*', '/']</span> -<span id="L120" class="LineNr">120 </span> look <span class="Special"><-</span> <a href='arith.mu.html#L237'>skip-spaces</a> look -<span id="L121" class="LineNr">121 </span> <span class="Delimiter">{</span> -<span id="L122" class="LineNr">122 </span> <span class="PreProc">var</span> continue?/eax: boolean <span class="Special"><-</span> <a href='arith.mu.html#L177'>mul-or-div?</a> look -<span id="L123" class="LineNr">123 </span> compare continue?, <span class="Constant">0</span>/false -<span id="L124" class="LineNr">124 </span> <span class="PreProc">break-if-=</span> $term:<span class="PreProc">loop</span> -<span id="L125" class="LineNr">125 </span> <span class="Delimiter">}</span> -<span id="L126" class="LineNr">126 </span> <span class="muComment"># read operator</span> -<span id="L127" class="LineNr">127 </span> <span class="PreProc">var</span> op/<span class="muRegEcx">ecx</span>: grapheme <span class="Special"><-</span> copy <span class="Constant">0</span> -<span id="L128" class="LineNr">128 </span> op, look <span class="Special"><-</span> operator look -<span id="L129" class="LineNr">129 </span> <span class="muComment"># read next arg</span> -<span id="L130" class="LineNr">130 </span> <span class="PreProc">var</span> second/<span class="muRegEdx">edx</span>: int <span class="Special"><-</span> copy <span class="Constant">0</span> -<span id="L131" class="LineNr">131 </span> look <span class="Special"><-</span> <a href='arith.mu.html#L237'>skip-spaces</a> look -<span id="L132" class="LineNr">132 </span> <span class="Delimiter">{</span> -<span id="L133" class="LineNr">133 </span> <span class="PreProc">var</span> tmp/eax: int <span class="Special"><-</span> copy <span class="Constant">0</span> -<span id="L134" class="LineNr">134 </span> tmp, look <span class="Special"><-</span> <a href='arith.mu.html#L157'>factor</a> look -<span id="L135" class="LineNr">135 </span> second <span class="Special"><-</span> copy tmp -<span id="L136" class="LineNr">136 </span> <span class="Delimiter">}</span> -<span id="L137" class="LineNr">137 </span> <span class="muComment"># reduce</span> -<span id="L138" class="LineNr">138 </span> $term:perform-op: <span class="Delimiter">{</span> -<span id="L139" class="LineNr">139 </span> <span class="Delimiter">{</span> -<span id="L140" class="LineNr">140 </span> compare op, <span class="Constant">0x2a</span>/* -<span id="L141" class="LineNr">141 </span> <span class="PreProc">break-if-!=</span> -<span id="L142" class="LineNr">142 </span> result <span class="Special"><-</span> multiply second -<span id="L143" class="LineNr">143 </span> <span class="PreProc">break</span> $term:perform-op -<span id="L144" class="LineNr">144 </span> <span class="Delimiter">}</span> -<span id="L145" class="LineNr">145 </span><span class="CommentedCode">#? {</span> -<span id="L146" class="LineNr">146 </span><span class="CommentedCode">#? compare op, 0x2f/slash</span> -<span id="L147" class="LineNr">147 </span><span class="CommentedCode">#? break-if-!=</span> -<span id="L148" class="LineNr">148 </span><span class="CommentedCode">#? result <- divide second # not in Mu yet</span> -<span id="L149" class="LineNr">149 </span><span class="CommentedCode">#? break $term:perform-op</span> -<span id="L150" class="LineNr">150 </span><span class="CommentedCode">#? }</span> -<span id="L151" class="LineNr">151 </span> <span class="Delimiter">}</span> -<span id="L152" class="LineNr">152 </span> <span class="PreProc">loop</span> -<span id="L153" class="LineNr">153 </span> <span class="Delimiter">}</span> -<span id="L154" class="LineNr">154 </span> <span class="PreProc">return</span> result, look -<span id="L155" class="LineNr">155 </span><span class="Delimiter">}</span> -<span id="L156" class="LineNr">156 </span> -<span id="L157" class="LineNr">157 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='arith.mu.html#L157'>factor</a></span> _look: grapheme<span class="PreProc"> -> </span>_/eax: int, _/<span class="muRegEsi">esi</span>: grapheme <span class="Delimiter">{</span> -<span id="L158" class="LineNr">158 </span> <span class="PreProc">var</span> look/<span class="muRegEsi">esi</span>: grapheme <span class="Special"><-</span> copy _look <span class="muComment"># should be a no-op</span> -<span id="L159" class="LineNr">159 </span> look <span class="Special"><-</span> <a href='arith.mu.html#L237'>skip-spaces</a> look -<span id="L160" class="LineNr">160 </span> <span class="muComment"># if next char is not '(', parse a number</span> -<span id="L161" class="LineNr">161 </span> compare look, <span class="Constant">0x28</span>/open-paren -<span id="L162" class="LineNr">162 </span> <span class="Delimiter">{</span> -<span id="L163" class="LineNr">163 </span> <span class="PreProc">break-if-=</span> -<span id="L164" class="LineNr">164 </span> <span class="PreProc">var</span> result/eax: int <span class="Special"><-</span> copy <span class="Constant">0</span> -<span id="L165" class="LineNr">165 </span> result, look <span class="Special"><-</span> <a href='arith.mu.html#L211'>num</a> look -<span id="L166" class="LineNr">166 </span> <span class="PreProc">return</span> result, look -<span id="L167" class="LineNr">167 </span> <span class="Delimiter">}</span> -<span id="L168" class="LineNr">168 </span> <span class="muComment"># otherwise recurse</span> -<span id="L169" class="LineNr">169 </span> look <span class="Special"><-</span> <a href='arith.mu.html#L248'>get-char</a> <span class="muComment"># '('</span> -<span id="L170" class="LineNr">170 </span> <span class="PreProc">var</span> result/eax: int <span class="Special"><-</span> copy <span class="Constant">0</span> -<span id="L171" class="LineNr">171 </span> result, look <span class="Special"><-</span> <a href='arith.mu.html#L67'>expression</a> look -<span id="L172" class="LineNr">172 </span> look <span class="Special"><-</span> <a href='arith.mu.html#L237'>skip-spaces</a> look -<span id="L173" class="LineNr">173 </span> look <span class="Special"><-</span> <a href='arith.mu.html#L248'>get-char</a> <span class="muComment"># ')'</span> -<span id="L174" class="LineNr">174 </span> <span class="PreProc">return</span> result, look -<span id="L175" class="LineNr">175 </span><span class="Delimiter">}</span> -<span id="L176" class="LineNr">176 </span> -<span id="L177" class="LineNr">177 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='arith.mu.html#L177'>mul-or-div?</a></span> c: grapheme<span class="PreProc"> -> </span>_/eax: boolean <span class="Delimiter">{</span> -<span id="L178" class="LineNr">178 </span> compare c, <span class="Constant">0x2a</span>/* -<span id="L179" class="LineNr">179 </span> <span class="Delimiter">{</span> -<span id="L180" class="LineNr">180 </span> <span class="PreProc">break-if-!=</span> -<span id="L181" class="LineNr">181 </span> <span class="PreProc">return</span> <span class="Constant">1</span>/true -<span id="L182" class="LineNr">182 </span> <span class="Delimiter">}</span> -<span id="L183" class="LineNr">183 </span> compare c, <span class="Constant">0x2f</span>/slash -<span id="L184" class="LineNr">184 </span> <span class="Delimiter">{</span> -<span id="L185" class="LineNr">185 </span> <span class="PreProc">break-if-!=</span> -<span id="L186" class="LineNr">186 </span> <span class="PreProc">return</span> <span class="Constant">1</span>/true -<span id="L187" class="LineNr">187 </span> <span class="Delimiter">}</span> -<span id="L188" class="LineNr">188 </span> <span class="PreProc">return</span> <span class="Constant">0</span>/false -<span id="L189" class="LineNr">189 </span><span class="Delimiter">}</span> -<span id="L190" class="LineNr">190 </span> -<span id="L191" class="LineNr">191 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='arith.mu.html#L191'>add-or-sub?</a></span> c: grapheme<span class="PreProc"> -> </span>_/eax: boolean <span class="Delimiter">{</span> -<span id="L192" class="LineNr">192 </span> compare c, <span class="Constant">0x2b</span>/+ -<span id="L193" class="LineNr">193 </span> <span class="Delimiter">{</span> -<span id="L194" class="LineNr">194 </span> <span class="PreProc">break-if-!=</span> -<span id="L195" class="LineNr">195 </span> <span class="PreProc">return</span> <span class="Constant">1</span>/true -<span id="L196" class="LineNr">196 </span> <span class="Delimiter">}</span> -<span id="L197" class="LineNr">197 </span> compare c, <span class="Constant">0x2d</span>/minus -<span id="L198" class="LineNr">198 </span> <span class="Delimiter">{</span> -<span id="L199" class="LineNr">199 </span> <span class="PreProc">break-if-!=</span> -<span id="L200" class="LineNr">200 </span> <span class="PreProc">return</span> <span class="Constant">1</span>/true -<span id="L201" class="LineNr">201 </span> <span class="Delimiter">}</span> -<span id="L202" class="LineNr">202 </span> <span class="PreProc">return</span> <span class="Constant">0</span>/false -<span id="L203" class="LineNr">203 </span><span class="Delimiter">}</span> -<span id="L204" class="LineNr">204 </span> -<span id="L205" class="LineNr">205 </span><span class="PreProc">fn</span> <span class="muFunction">operator</span> _look: grapheme<span class="PreProc"> -> </span>_/<span class="muRegEcx">ecx</span>: grapheme, _/<span class="muRegEsi">esi</span>: grapheme <span class="Delimiter">{</span> -<span id="L206" class="LineNr">206 </span> <span class="PreProc">var</span> op/<span class="muRegEcx">ecx</span>: grapheme <span class="Special"><-</span> copy _look -<span id="L207" class="LineNr">207 </span> <span class="PreProc">var</span> look/<span class="muRegEsi">esi</span>: grapheme <span class="Special"><-</span> <a href='arith.mu.html#L248'>get-char</a> -<span id="L208" class="LineNr">208 </span> <span class="PreProc">return</span> op, look -<span id="L209" class="LineNr">209 </span><span class="Delimiter">}</span> -<span id="L210" class="LineNr">210 </span> -<span id="L211" class="LineNr">211 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='arith.mu.html#L211'>num</a></span> _look: grapheme<span class="PreProc"> -> </span>_/eax: int, _/<span class="muRegEsi">esi</span>: grapheme <span class="Delimiter">{</span> -<span id="L212" class="LineNr">212 </span> <span class="PreProc">var</span> look/<span class="muRegEsi">esi</span>: grapheme <span class="Special"><-</span> copy _look -<span id="L213" class="LineNr">213 </span> <span class="PreProc">var</span> result/<span class="muRegEdi">edi</span>: int <span class="Special"><-</span> copy <span class="Constant">0</span> -<span id="L214" class="LineNr">214 </span> <span class="Delimiter">{</span> -<span id="L215" class="LineNr">215 </span> <span class="PreProc">var</span> first-digit/eax: int <span class="Special"><-</span> <a href='126write-int-decimal.subx.html#L405'>to-decimal-digit</a> look -<span id="L216" class="LineNr">216 </span> result <span class="Special"><-</span> copy first-digit -<span id="L217" class="LineNr">217 </span> <span class="Delimiter">}</span> -<span id="L218" class="LineNr">218 </span> <span class="Delimiter">{</span> -<span id="L219" class="LineNr">219 </span> look <span class="Special"><-</span> <a href='arith.mu.html#L248'>get-char</a> -<span id="L220" class="LineNr">220 </span> <span class="muComment"># done?</span> -<span id="L221" class="LineNr">221 </span> <span class="PreProc">var</span> digit?/eax: boolean <span class="Special"><-</span> <a href='126write-int-decimal.subx.html#L306'>decimal-digit?</a> look -<span id="L222" class="LineNr">222 </span> compare digit?, <span class="Constant">0</span>/false -<span id="L223" class="LineNr">223 </span> <span class="PreProc">break-if-=</span> -<span id="L224" class="LineNr">224 </span> <span class="muComment"># result *= 10</span> -<span id="L225" class="LineNr">225 </span> <span class="Delimiter">{</span> -<span id="L226" class="LineNr">226 </span> <span class="PreProc">var</span> ten/eax: int <span class="Special"><-</span> copy <span class="Constant">0xa</span> -<span id="L227" class="LineNr">227 </span> result <span class="Special"><-</span> multiply ten -<span id="L228" class="LineNr">228 </span> <span class="Delimiter">}</span> -<span id="L229" class="LineNr">229 </span> <span class="muComment"># result += digit(look)</span> -<span id="L230" class="LineNr">230 </span> <span class="PreProc">var</span> digit/eax: int <span class="Special"><-</span> <a href='126write-int-decimal.subx.html#L405'>to-decimal-digit</a> look -<span id="L231" class="LineNr">231 </span> result <span class="Special"><-</span> add digit -<span id="L232" class="LineNr">232 </span> <span class="PreProc">loop</span> -<span id="L233" class="LineNr">233 </span> <span class="Delimiter">}</span> -<span id="L234" class="LineNr">234 </span> <span class="PreProc">return</span> result, look -<span id="L235" class="LineNr">235 </span><span class="Delimiter">}</span> -<span id="L236" class="LineNr">236 </span> -<span id="L237" class="LineNr">237 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='arith.mu.html#L237'>skip-spaces</a></span> _look: grapheme<span class="PreProc"> -> </span>_/<span class="muRegEsi">esi</span>: grapheme <span class="Delimiter">{</span> -<span id="L238" class="LineNr">238 </span> <span class="PreProc">var</span> look/<span class="muRegEsi">esi</span>: grapheme <span class="Special"><-</span> copy _look <span class="muComment"># should be a no-op</span> -<span id="L239" class="LineNr">239 </span> <span class="Delimiter">{</span> -<span id="L240" class="LineNr">240 </span> compare look, <span class="Constant">0x20</span> -<span id="L241" class="LineNr">241 </span> <span class="PreProc">break-if-!=</span> -<span id="L242" class="LineNr">242 </span> look <span class="Special"><-</span> <a href='arith.mu.html#L248'>get-char</a> -<span id="L243" class="LineNr">243 </span> <span class="PreProc">loop</span> -<span id="L244" class="LineNr">244 </span> <span class="Delimiter">}</span> -<span id="L245" class="LineNr">245 </span> <span class="PreProc">return</span> look -<span id="L246" class="LineNr">246 </span><span class="Delimiter">}</span> -<span id="L247" class="LineNr">247 </span> -<span id="L248" class="LineNr">248 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='arith.mu.html#L248'>get-char</a></span><span class="PreProc"> -> </span>_/<span class="muRegEsi">esi</span>: grapheme <span class="Delimiter">{</span> -<span id="L249" class="LineNr">249 </span> <span class="PreProc">var</span> look/eax: grapheme <span class="Special"><-</span> <a href='305keyboard.subx.html#L132'>read-key-from-real-keyboard</a> -<span id="L250" class="LineNr">250 </span> <a href='304screen.subx.html#L161'>print-grapheme-to-real-screen</a> look -<span id="L251" class="LineNr">251 </span> compare look, <span class="Constant">4</span> -<span id="L252" class="LineNr">252 </span> <span class="Delimiter">{</span> -<span id="L253" class="LineNr">253 </span> <span class="PreProc">break-if-!=</span> -<span id="L254" class="LineNr">254 </span> <a href='405screen.mu.html#L169'>print-string</a> <span class="Constant">0</span>/screen, <span class="Constant">"^D\n"</span> -<span id="L255" class="LineNr">255 </span> <a href='000init.subx.html#L18'>syscall_exit</a> -<span id="L256" class="LineNr">256 </span> <span class="Delimiter">}</span> -<span id="L257" class="LineNr">257 </span> <span class="PreProc">return</span> look -<span id="L258" class="LineNr">258 </span><span class="Delimiter">}</span> -</pre> 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