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+<!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 - baremetal/shell/gap-buffer.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: #c6c6c6; }
+body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; }
+a { color:inherit; }
+* { font-size:12pt; font-size: 1em; }
+.PreProc { color: #c000c0; }
+.LineNr { }
+.Constant { color: #008787; }
+.SpecialChar { color: #d70000; }
+.Delimiter { color: #c000c0; }
+.muFunction { color: #af5f00; text-decoration: underline; }
+.muTest { color: #5f8700; }
+.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/baremetal/shell/gap-buffer.mu'>https://github.com/akkartik/mu/blob/main/baremetal/shell/gap-buffer.mu</a>
+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr">  1 </span><span class="muComment"># primitive for editing a single word</span>
+<span id="L2" class="LineNr">  2 </span><span class="muComment"># parameter: max-word-size = 16 graphemes</span>
+<span id="L3" class="LineNr">  3 </span>
+<span id="L4" class="LineNr">  4 </span><span class="PreProc">type</span> <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a> <span class="Delimiter">{</span>
+<span id="L5" class="LineNr">  5 </span>  left: <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>
+<span id="L6" class="LineNr">  6 </span>  right: <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>
+<span id="L7" class="LineNr">  7 </span><span class="Delimiter">}</span>
+<span id="L8" class="LineNr">  8 </span>
+<span id="L9" class="LineNr">  9 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='shell/gap-buffer.mu.html#L9'>initialize-gap-buffer</a></span> _self: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="Delimiter">{</span>
+<span id="L10" class="LineNr"> 10 </span>  <span class="PreProc">var</span> self/<span class="Constant">esi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> copy _self
+<span id="L11" class="LineNr"> 11 </span>  <span class="PreProc">var</span> left/<span class="Constant">eax</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get self, left
+<span id="L12" class="LineNr"> 12 </span>  <a href='shell/grapheme-stack.mu.html#L9'>initialize-grapheme-stack</a> left, <span class="Constant">0x10</span>/max-word-size
+<span id="L13" class="LineNr"> 13 </span>  <span class="PreProc">var</span> right/<span class="Constant">eax</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get self, right
+<span id="L14" class="LineNr"> 14 </span>  <a href='shell/grapheme-stack.mu.html#L9'>initialize-grapheme-stack</a> right, <span class="Constant">0x10</span>/max-word-size
+<span id="L15" class="LineNr"> 15 </span><span class="Delimiter">}</span>
+<span id="L16" class="LineNr"> 16 </span>
+<span id="L17" class="LineNr"> 17 </span><span class="muComment"># just for tests</span>
+<span id="L18" class="LineNr"> 18 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='shell/gap-buffer.mu.html#L18'>initialize-gap-buffer-with</a></span> self: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>), s: (addr array byte) <span class="Delimiter">{</span>
+<span id="L19" class="LineNr"> 19 </span>  <a href='shell/gap-buffer.mu.html#L9'>initialize-gap-buffer</a> self
+<span id="L20" class="LineNr"> 20 </span>  <span class="PreProc">var</span> stream-storage: (stream byte <span class="Constant">0x10</span>/max-word-size)
+<span id="L21" class="LineNr"> 21 </span>  <span class="PreProc">var</span> stream/<span class="Constant">ecx</span>: (addr stream byte) <span class="SpecialChar">&lt;-</span> address stream-storage
+<span id="L22" class="LineNr"> 22 </span>  <a href='108write.subx.html#L11'>write</a> stream, s
+<span id="L23" class="LineNr"> 23 </span>  <span class="Delimiter">{</span>
+<span id="L24" class="LineNr"> 24 </span>    <span class="PreProc">var</span> done?/<span class="Constant">eax</span>: boolean <span class="SpecialChar">&lt;-</span> <a href='309stream.subx.html#L6'>stream-empty?</a> stream
+<span id="L25" class="LineNr"> 25 </span>    compare done?, <span class="Constant">0</span>/false
+<span id="L26" class="LineNr"> 26 </span>    <span class="PreProc">break-if-!=</span>
+<span id="L27" class="LineNr"> 27 </span>    <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='403unicode.mu.html#L92'>read-grapheme</a> stream
+<span id="L28" class="LineNr"> 28 </span>    <a href='shell/gap-buffer.mu.html#L118'>add-grapheme-at-gap</a> self, g
+<span id="L29" class="LineNr"> 29 </span>    <span class="PreProc">loop</span>
+<span id="L30" class="LineNr"> 30 </span>  <span class="Delimiter">}</span>
+<span id="L31" class="LineNr"> 31 </span><span class="Delimiter">}</span>
+<span id="L32" class="LineNr"> 32 </span>
+<span id="L33" class="LineNr"> 33 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='shell/gap-buffer.mu.html#L33'>emit-gap-buffer</a></span> _self: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>), out: (addr stream byte) <span class="Delimiter">{</span>
+<span id="L34" class="LineNr"> 34 </span>  <span class="PreProc">var</span> self/<span class="Constant">esi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> copy _self
+<span id="L35" class="LineNr"> 35 </span>  <a href='106stream.subx.html#L20'>clear-stream</a> out
+<span id="L36" class="LineNr"> 36 </span>  <span class="PreProc">var</span> left/<span class="Constant">eax</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get self, left
+<span id="L37" class="LineNr"> 37 </span>  <a href='shell/gap-buffer.mu.html#L43'>emit-stack-from-bottom</a> left, out
+<span id="L38" class="LineNr"> 38 </span>  <span class="PreProc">var</span> right/<span class="Constant">eax</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get self, right
+<span id="L39" class="LineNr"> 39 </span>  <a href='shell/gap-buffer.mu.html#L61'>emit-stack-from-top</a> right, out
+<span id="L40" class="LineNr"> 40 </span><span class="Delimiter">}</span>
+<span id="L41" class="LineNr"> 41 </span>
+<span id="L42" class="LineNr"> 42 </span><span class="muComment"># dump stack from bottom to top</span>
+<span id="L43" class="LineNr"> 43 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='shell/gap-buffer.mu.html#L43'>emit-stack-from-bottom</a></span> _self: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>), out: (addr stream byte) <span class="Delimiter">{</span>
+<span id="L44" class="LineNr"> 44 </span>  <span class="PreProc">var</span> self/<span class="Constant">esi</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> copy _self
+<span id="L45" class="LineNr"> 45 </span>  <span class="PreProc">var</span> data-ah/<span class="Constant">edi</span>: (addr handle array grapheme) <span class="SpecialChar">&lt;-</span> get self, data
+<span id="L46" class="LineNr"> 46 </span>  <span class="PreProc">var</span> _data/<span class="Constant">eax</span>: (addr array grapheme) <span class="SpecialChar">&lt;-</span> <a href='120allocate.subx.html#L226'>lookup</a> *data-ah
+<span id="L47" class="LineNr"> 47 </span>  <span class="PreProc">var</span> data/<span class="Constant">edi</span>: (addr array grapheme) <span class="SpecialChar">&lt;-</span> copy _data
+<span id="L48" class="LineNr"> 48 </span>  <span class="PreProc">var</span> top-addr/<span class="Constant">ecx</span>: (addr int) <span class="SpecialChar">&lt;-</span> get self, top
+<span id="L49" class="LineNr"> 49 </span>  <span class="PreProc">var</span> i/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0</span>
+<span id="L50" class="LineNr"> 50 </span>  <span class="Delimiter">{</span>
+<span id="L51" class="LineNr"> 51 </span>    compare i, *top-addr
+<span id="L52" class="LineNr"> 52 </span>    <span class="PreProc">break-if-&gt;=</span>
+<span id="L53" class="LineNr"> 53 </span>    <span class="PreProc">var</span> g/<span class="Constant">edx</span>: (addr grapheme) <span class="SpecialChar">&lt;-</span> index data, i
+<span id="L54" class="LineNr"> 54 </span>    <a href='403unicode.mu.html#L176'>write-grapheme</a> out, *g
+<span id="L55" class="LineNr"> 55 </span>    i <span class="SpecialChar">&lt;-</span> increment
+<span id="L56" class="LineNr"> 56 </span>    <span class="PreProc">loop</span>
+<span id="L57" class="LineNr"> 57 </span>  <span class="Delimiter">}</span>
+<span id="L58" class="LineNr"> 58 </span><span class="Delimiter">}</span>
+<span id="L59" class="LineNr"> 59 </span>
+<span id="L60" class="LineNr"> 60 </span><span class="muComment"># dump stack from top to bottom</span>
+<span id="L61" class="LineNr"> 61 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='shell/gap-buffer.mu.html#L61'>emit-stack-from-top</a></span> _self: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>), out: (addr stream byte) <span class="Delimiter">{</span>
+<span id="L62" class="LineNr"> 62 </span>  <span class="PreProc">var</span> self/<span class="Constant">esi</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> copy _self
+<span id="L63" class="LineNr"> 63 </span>  <span class="PreProc">var</span> data-ah/<span class="Constant">edi</span>: (addr handle array grapheme) <span class="SpecialChar">&lt;-</span> get self, data
+<span id="L64" class="LineNr"> 64 </span>  <span class="PreProc">var</span> _data/<span class="Constant">eax</span>: (addr array grapheme) <span class="SpecialChar">&lt;-</span> <a href='120allocate.subx.html#L226'>lookup</a> *data-ah
+<span id="L65" class="LineNr"> 65 </span>  <span class="PreProc">var</span> data/<span class="Constant">edi</span>: (addr array grapheme) <span class="SpecialChar">&lt;-</span> copy _data
+<span id="L66" class="LineNr"> 66 </span>  <span class="PreProc">var</span> top-addr/<span class="Constant">ecx</span>: (addr int) <span class="SpecialChar">&lt;-</span> get self, top
+<span id="L67" class="LineNr"> 67 </span>  <span class="PreProc">var</span> i/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy *top-addr
+<span id="L68" class="LineNr"> 68 </span>  i <span class="SpecialChar">&lt;-</span> decrement
+<span id="L69" class="LineNr"> 69 </span>  <span class="Delimiter">{</span>
+<span id="L70" class="LineNr"> 70 </span>    compare i, <span class="Constant">0</span>
+<span id="L71" class="LineNr"> 71 </span>    <span class="PreProc">break-if-&lt;</span>
+<span id="L72" class="LineNr"> 72 </span>    <span class="PreProc">var</span> g/<span class="Constant">edx</span>: (addr grapheme) <span class="SpecialChar">&lt;-</span> index data, i
+<span id="L73" class="LineNr"> 73 </span>    <a href='403unicode.mu.html#L176'>write-grapheme</a> out, *g
+<span id="L74" class="LineNr"> 74 </span>    i <span class="SpecialChar">&lt;-</span> decrement
+<span id="L75" class="LineNr"> 75 </span>    <span class="PreProc">loop</span>
+<span id="L76" class="LineNr"> 76 </span>  <span class="Delimiter">}</span>
+<span id="L77" class="LineNr"> 77 </span><span class="Delimiter">}</span>
+<span id="L78" class="LineNr"> 78 </span>
+<span id="L79" class="LineNr"> 79 </span><span class="muComment"># We implicitly render everything editable in a single color, and assume the</span>
+<span id="L80" class="LineNr"> 80 </span><span class="muComment"># cursor is a single other color.</span>
+<span id="L81" class="LineNr"> 81 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='shell/gap-buffer.mu.html#L81'>render-gap-buffer</a></span> <a href='500text-screen.mu.html#L9'>screen</a>: (addr <a href='500text-screen.mu.html#L9'>screen</a>), _gap: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>), x: int, y: int, render-cursor?: boolean<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: int <span class="Delimiter">{</span>
+<span id="L82" class="LineNr"> 82 </span>  <span class="PreProc">var</span> gap/<span class="Constant">esi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> copy _gap
+<span id="L83" class="LineNr"> 83 </span>  <span class="PreProc">var</span> left/<span class="Constant">eax</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get gap, left
+<span id="L84" class="LineNr"> 84 </span>  <span class="PreProc">var</span> x2/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> <a href='shell/grapheme-stack.mu.html#L81'>render-stack-from-bottom</a> <a href='500text-screen.mu.html#L9'>screen</a>, left, x, y
+<span id="L85" class="LineNr"> 85 </span>  <span class="PreProc">var</span> right/<span class="Constant">ecx</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get gap, right
+<span id="L86" class="LineNr"> 86 </span>  x2 <span class="SpecialChar">&lt;-</span> <a href='shell/grapheme-stack.mu.html#L102'>render-stack-from-top</a> <a href='500text-screen.mu.html#L9'>screen</a>, right, x2, y, render-cursor?
+<span id="L87" class="LineNr"> 87 </span>  <span class="PreProc">var</span> x3/<span class="Constant">ebx</span>: int <span class="SpecialChar">&lt;-</span> copy x2
+<span id="L88" class="LineNr"> 88 </span>  <span class="muComment"># decide whether we still need to print a cursor</span>
+<span id="L89" class="LineNr"> 89 </span>  <span class="PreProc">var</span> bg/<span class="Constant">edx</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0</span>
+<span id="L90" class="LineNr"> 90 </span>  compare render-cursor?, <span class="Constant">0</span>/false
+<span id="L91" class="LineNr"> 91 </span>  <span class="Delimiter">{</span>
+<span id="L92" class="LineNr"> 92 </span>    <span class="PreProc">break-if-=</span>
+<span id="L93" class="LineNr"> 93 </span>    <span class="muComment"># if the right side is empty, grapheme stack didn't print the cursor</span>
+<span id="L94" class="LineNr"> 94 </span>    <span class="PreProc">var</span> empty?/<span class="Constant">eax</span>: boolean <span class="SpecialChar">&lt;-</span> <a href='shell/grapheme-stack.mu.html#L23'>grapheme-stack-empty?</a> right
+<span id="L95" class="LineNr"> 95 </span>    compare empty?, <span class="Constant">0</span>/false
+<span id="L96" class="LineNr"> 96 </span>    <span class="PreProc">break-if-=</span>
+<span id="L97" class="LineNr"> 97 </span>    bg <span class="SpecialChar">&lt;-</span> copy <span class="Constant">7</span>/cursor
+<span id="L98" class="LineNr"> 98 </span>  <span class="Delimiter">}</span>
+<span id="L99" class="LineNr"> 99 </span>  <span class="muComment"># print a grapheme either way so that cursor position doesn't affect printed width</span>
+<span id="L100" class="LineNr">100 </span>  <span class="PreProc">var</span> space/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0x20</span>
+<span id="L101" class="LineNr">101 </span>  <a href='500text-screen.mu.html#L68'>draw-grapheme</a> <a href='500text-screen.mu.html#L9'>screen</a>, space, x3, y, <span class="Constant">3</span>/fg=cyan, bg
+<span id="L102" class="LineNr">102 </span>  x3 <span class="SpecialChar">&lt;-</span> increment
+<span id="L103" class="LineNr">103 </span>  <span class="PreProc">return</span> x3
+<span id="L104" class="LineNr">104 </span><span class="Delimiter">}</span>
+<span id="L105" class="LineNr">105 </span>
+<span id="L106" class="LineNr">106 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='shell/gap-buffer.mu.html#L106'>gap-buffer-length</a></span> _gap: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>)<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: int <span class="Delimiter">{</span>
+<span id="L107" class="LineNr">107 </span>  <span class="PreProc">var</span> gap/<span class="Constant">esi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> copy _gap
+<span id="L108" class="LineNr">108 </span>  <span class="PreProc">var</span> left/<span class="Constant">eax</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get gap, left
+<span id="L109" class="LineNr">109 </span>  <span class="PreProc">var</span> tmp/<span class="Constant">eax</span>: (addr int) <span class="SpecialChar">&lt;-</span> get left, top
+<span id="L110" class="LineNr">110 </span>  <span class="PreProc">var</span> left-length/<span class="Constant">ecx</span>: int <span class="SpecialChar">&lt;-</span> copy *tmp
+<span id="L111" class="LineNr">111 </span>  <span class="PreProc">var</span> right/<span class="Constant">esi</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get gap, right
+<span id="L112" class="LineNr">112 </span>  tmp <span class="SpecialChar">&lt;-</span> get right, top
+<span id="L113" class="LineNr">113 </span>  <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy *tmp
+<span id="L114" class="LineNr">114 </span>  result <span class="SpecialChar">&lt;-</span> add left-length
+<span id="L115" class="LineNr">115 </span>  <span class="PreProc">return</span> result
+<span id="L116" class="LineNr">116 </span><span class="Delimiter">}</span>
+<span id="L117" class="LineNr">117 </span>
+<span id="L118" class="LineNr">118 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='shell/gap-buffer.mu.html#L118'>add-grapheme-at-gap</a></span> _self: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>), g: grapheme <span class="Delimiter">{</span>
+<span id="L119" class="LineNr">119 </span>  <span class="PreProc">var</span> self/<span class="Constant">esi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> copy _self
+<span id="L120" class="LineNr">120 </span>  <span class="PreProc">var</span> left/<span class="Constant">eax</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get self, left
+<span id="L121" class="LineNr">121 </span>  <a href='shell/grapheme-stack.mu.html#L34'>push-grapheme-stack</a> left, g
+<span id="L122" class="LineNr">122 </span><span class="Delimiter">}</span>
+<span id="L123" class="LineNr">123 </span>
+<span id="L124" class="LineNr">124 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='shell/gap-buffer.mu.html#L124'>gap-to-start</a></span> self: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="Delimiter">{</span>
+<span id="L125" class="LineNr">125 </span>  <span class="Delimiter">{</span>
+<span id="L126" class="LineNr">126 </span>    <span class="PreProc">var</span> curr/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='shell/gap-buffer.mu.html#L168'>gap-left</a> self
+<span id="L127" class="LineNr">127 </span>    compare curr, <span class="Constant">-1</span>
+<span id="L128" class="LineNr">128 </span>    <span class="PreProc">loop-if-!=</span>
+<span id="L129" class="LineNr">129 </span>  <span class="Delimiter">}</span>
+<span id="L130" class="LineNr">130 </span><span class="Delimiter">}</span>
+<span id="L131" class="LineNr">131 </span>
+<span id="L132" class="LineNr">132 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='shell/gap-buffer.mu.html#L132'>gap-to-end</a></span> self: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="Delimiter">{</span>
+<span id="L133" class="LineNr">133 </span>  <span class="Delimiter">{</span>
+<span id="L134" class="LineNr">134 </span>    <span class="PreProc">var</span> curr/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='shell/gap-buffer.mu.html#L154'>gap-right</a> self
+<span id="L135" class="LineNr">135 </span>    compare curr, <span class="Constant">-1</span>
+<span id="L136" class="LineNr">136 </span>    <span class="PreProc">loop-if-!=</span>
+<span id="L137" class="LineNr">137 </span>  <span class="Delimiter">}</span>
+<span id="L138" class="LineNr">138 </span><span class="Delimiter">}</span>
+<span id="L139" class="LineNr">139 </span>
+<span id="L140" class="LineNr">140 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='shell/gap-buffer.mu.html#L140'>gap-at-start?</a></span> _self: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>)<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: boolean <span class="Delimiter">{</span>
+<span id="L141" class="LineNr">141 </span>  <span class="PreProc">var</span> self/<span class="Constant">esi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> copy _self
+<span id="L142" class="LineNr">142 </span>  <span class="PreProc">var</span> left/<span class="Constant">eax</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get self, left
+<span id="L143" class="LineNr">143 </span>  <span class="PreProc">var</span> result/<span class="Constant">eax</span>: boolean <span class="SpecialChar">&lt;-</span> <a href='shell/grapheme-stack.mu.html#L23'>grapheme-stack-empty?</a> left
+<span id="L144" class="LineNr">144 </span>  <span class="PreProc">return</span> result
+<span id="L145" class="LineNr">145 </span><span class="Delimiter">}</span>
+<span id="L146" class="LineNr">146 </span>
+<span id="L147" class="LineNr">147 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='shell/gap-buffer.mu.html#L147'>gap-at-end?</a></span> _self: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>)<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: boolean <span class="Delimiter">{</span>
+<span id="L148" class="LineNr">148 </span>  <span class="PreProc">var</span> self/<span class="Constant">esi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> copy _self
+<span id="L149" class="LineNr">149 </span>  <span class="PreProc">var</span> right/<span class="Constant">eax</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get self, right
+<span id="L150" class="LineNr">150 </span>  <span class="PreProc">var</span> result/<span class="Constant">eax</span>: boolean <span class="SpecialChar">&lt;-</span> <a href='shell/grapheme-stack.mu.html#L23'>grapheme-stack-empty?</a> right
+<span id="L151" class="LineNr">151 </span>  <span class="PreProc">return</span> result
+<span id="L152" class="LineNr">152 </span><span class="Delimiter">}</span>
+<span id="L153" class="LineNr">153 </span>
+<span id="L154" class="LineNr">154 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='shell/gap-buffer.mu.html#L154'>gap-right</a></span> _self: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>)<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: grapheme <span class="Delimiter">{</span>
+<span id="L155" class="LineNr">155 </span>  <span class="PreProc">var</span> self/<span class="Constant">esi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> copy _self
+<span id="L156" class="LineNr">156 </span>  <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0</span>
+<span id="L157" class="LineNr">157 </span>  <span class="PreProc">var</span> right/<span class="Constant">ecx</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get self, right
+<span id="L158" class="LineNr">158 </span>  g <span class="SpecialChar">&lt;-</span> <a href='shell/grapheme-stack.mu.html#L46'>pop-grapheme-stack</a> right
+<span id="L159" class="LineNr">159 </span>  compare g, <span class="Constant">-1</span>
+<span id="L160" class="LineNr">160 </span>  <span class="Delimiter">{</span>
+<span id="L161" class="LineNr">161 </span>    <span class="PreProc">break-if-=</span>
+<span id="L162" class="LineNr">162 </span>    <span class="PreProc">var</span> left/<span class="Constant">ecx</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get self, left
+<span id="L163" class="LineNr">163 </span>    <a href='shell/grapheme-stack.mu.html#L34'>push-grapheme-stack</a> left, g
+<span id="L164" class="LineNr">164 </span>  <span class="Delimiter">}</span>
+<span id="L165" class="LineNr">165 </span>  <span class="PreProc">return</span> g
+<span id="L166" class="LineNr">166 </span><span class="Delimiter">}</span>
+<span id="L167" class="LineNr">167 </span>
+<span id="L168" class="LineNr">168 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='shell/gap-buffer.mu.html#L168'>gap-left</a></span> _self: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>)<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: grapheme <span class="Delimiter">{</span>
+<span id="L169" class="LineNr">169 </span>  <span class="PreProc">var</span> self/<span class="Constant">esi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> copy _self
+<span id="L170" class="LineNr">170 </span>  <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0</span>
+<span id="L171" class="LineNr">171 </span>  <span class="Delimiter">{</span>
+<span id="L172" class="LineNr">172 </span>    <span class="PreProc">var</span> left/<span class="Constant">ecx</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get self, left
+<span id="L173" class="LineNr">173 </span>    g <span class="SpecialChar">&lt;-</span> <a href='shell/grapheme-stack.mu.html#L46'>pop-grapheme-stack</a> left
+<span id="L174" class="LineNr">174 </span>  <span class="Delimiter">}</span>
+<span id="L175" class="LineNr">175 </span>  compare g, <span class="Constant">-1</span>
+<span id="L176" class="LineNr">176 </span>  <span class="Delimiter">{</span>
+<span id="L177" class="LineNr">177 </span>    <span class="PreProc">break-if-=</span>
+<span id="L178" class="LineNr">178 </span>    <span class="PreProc">var</span> right/<span class="Constant">ecx</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get self, right
+<span id="L179" class="LineNr">179 </span>    <a href='shell/grapheme-stack.mu.html#L34'>push-grapheme-stack</a> right, g
+<span id="L180" class="LineNr">180 </span>  <span class="Delimiter">}</span>
+<span id="L181" class="LineNr">181 </span>  <span class="PreProc">return</span> g
+<span id="L182" class="LineNr">182 </span><span class="Delimiter">}</span>
+<span id="L183" class="LineNr">183 </span>
+<span id="L184" class="LineNr">184 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='shell/gap-buffer.mu.html#L184'>index-of-gap</a></span> _self: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>)<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: int <span class="Delimiter">{</span>
+<span id="L185" class="LineNr">185 </span>  <span class="PreProc">var</span> self/<span class="Constant">eax</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> copy _self
+<span id="L186" class="LineNr">186 </span>  <span class="PreProc">var</span> left/<span class="Constant">eax</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get self, left
+<span id="L187" class="LineNr">187 </span>  <span class="PreProc">var</span> top-addr/<span class="Constant">eax</span>: (addr int) <span class="SpecialChar">&lt;-</span> get left, top
+<span id="L188" class="LineNr">188 </span>  <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy *top-addr
+<span id="L189" class="LineNr">189 </span>  <span class="PreProc">return</span> result
+<span id="L190" class="LineNr">190 </span><span class="Delimiter">}</span>
+<span id="L191" class="LineNr">191 </span>
+<span id="L192" class="LineNr">192 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='shell/gap-buffer.mu.html#L192'>first-grapheme-in-gap-buffer</a></span> _self: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>)<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: grapheme <span class="Delimiter">{</span>
+<span id="L193" class="LineNr">193 </span>  <span class="PreProc">var</span> self/<span class="Constant">esi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> copy _self
+<span id="L194" class="LineNr">194 </span>  <span class="muComment"># try to read from left</span>
+<span id="L195" class="LineNr">195 </span>  <span class="PreProc">var</span> left/<span class="Constant">eax</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get self, left
+<span id="L196" class="LineNr">196 </span>  <span class="PreProc">var</span> top-addr/<span class="Constant">ecx</span>: (addr int) <span class="SpecialChar">&lt;-</span> get left, top
+<span id="L197" class="LineNr">197 </span>  compare *top-addr, <span class="Constant">0</span>
+<span id="L198" class="LineNr">198 </span>  <span class="Delimiter">{</span>
+<span id="L199" class="LineNr">199 </span>    <span class="PreProc">break-if-&lt;=</span>
+<span id="L200" class="LineNr">200 </span>    <span class="PreProc">var</span> data-ah/<span class="Constant">eax</span>: (addr handle array grapheme) <span class="SpecialChar">&lt;-</span> get left, data
+<span id="L201" class="LineNr">201 </span>    <span class="PreProc">var</span> data/<span class="Constant">eax</span>: (addr array grapheme) <span class="SpecialChar">&lt;-</span> <a href='120allocate.subx.html#L226'>lookup</a> *data-ah
+<span id="L202" class="LineNr">202 </span>    <span class="PreProc">var</span> result-addr/<span class="Constant">eax</span>: (addr grapheme) <span class="SpecialChar">&lt;-</span> index data, <span class="Constant">0</span>
+<span id="L203" class="LineNr">203 </span>    <span class="PreProc">return</span> *result-addr
+<span id="L204" class="LineNr">204 </span>  <span class="Delimiter">}</span>
+<span id="L205" class="LineNr">205 </span>  <span class="muComment"># try to read from right</span>
+<span id="L206" class="LineNr">206 </span>  <span class="PreProc">var</span> right/<span class="Constant">eax</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get self, right
+<span id="L207" class="LineNr">207 </span>  top-addr <span class="SpecialChar">&lt;-</span> get right, top
+<span id="L208" class="LineNr">208 </span>  compare *top-addr, <span class="Constant">0</span>
+<span id="L209" class="LineNr">209 </span>  <span class="Delimiter">{</span>
+<span id="L210" class="LineNr">210 </span>    <span class="PreProc">break-if-&lt;=</span>
+<span id="L211" class="LineNr">211 </span>    <span class="PreProc">var</span> data-ah/<span class="Constant">eax</span>: (addr handle array grapheme) <span class="SpecialChar">&lt;-</span> get right, data
+<span id="L212" class="LineNr">212 </span>    <span class="PreProc">var</span> data/<span class="Constant">eax</span>: (addr array grapheme) <span class="SpecialChar">&lt;-</span> <a href='120allocate.subx.html#L226'>lookup</a> *data-ah
+<span id="L213" class="LineNr">213 </span>    <span class="PreProc">var</span> top/<span class="Constant">ecx</span>: int <span class="SpecialChar">&lt;-</span> copy *top-addr
+<span id="L214" class="LineNr">214 </span>    top <span class="SpecialChar">&lt;-</span> decrement
+<span id="L215" class="LineNr">215 </span>    <span class="PreProc">var</span> result-addr/<span class="Constant">eax</span>: (addr grapheme) <span class="SpecialChar">&lt;-</span> index data, top
+<span id="L216" class="LineNr">216 </span>    <span class="PreProc">return</span> *result-addr
+<span id="L217" class="LineNr">217 </span>  <span class="Delimiter">}</span>
+<span id="L218" class="LineNr">218 </span>  <span class="muComment"># give up</span>
+<span id="L219" class="LineNr">219 </span>  <span class="PreProc">return</span> <span class="Constant">-1</span>
+<span id="L220" class="LineNr">220 </span><span class="Delimiter">}</span>
+<span id="L221" class="LineNr">221 </span>
+<span id="L222" class="LineNr">222 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='shell/gap-buffer.mu.html#L222'>grapheme-before-cursor-in-gap-buffer</a></span> _self: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>)<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: grapheme <span class="Delimiter">{</span>
+<span id="L223" class="LineNr">223 </span>  <span class="PreProc">var</span> self/<span class="Constant">esi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> copy _self
+<span id="L224" class="LineNr">224 </span>  <span class="muComment"># try to read from left</span>
+<span id="L225" class="LineNr">225 </span>  <span class="PreProc">var</span> left/<span class="Constant">ecx</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get self, left
+<span id="L226" class="LineNr">226 </span>  <span class="PreProc">var</span> top-addr/<span class="Constant">edx</span>: (addr int) <span class="SpecialChar">&lt;-</span> get left, top
+<span id="L227" class="LineNr">227 </span>  compare *top-addr, <span class="Constant">0</span>
+<span id="L228" class="LineNr">228 </span>  <span class="Delimiter">{</span>
+<span id="L229" class="LineNr">229 </span>    <span class="PreProc">break-if-&lt;=</span>
+<span id="L230" class="LineNr">230 </span>    <span class="PreProc">var</span> result/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='shell/grapheme-stack.mu.html#L46'>pop-grapheme-stack</a> left
+<span id="L231" class="LineNr">231 </span>    <a href='shell/grapheme-stack.mu.html#L34'>push-grapheme-stack</a> left, result
+<span id="L232" class="LineNr">232 </span>    <span class="PreProc">return</span> result
+<span id="L233" class="LineNr">233 </span>  <span class="Delimiter">}</span>
+<span id="L234" class="LineNr">234 </span>  <span class="muComment"># give up</span>
+<span id="L235" class="LineNr">235 </span>  <span class="PreProc">return</span> <span class="Constant">-1</span>
+<span id="L236" class="LineNr">236 </span><span class="Delimiter">}</span>
+<span id="L237" class="LineNr">237 </span>
+<span id="L238" class="LineNr">238 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='shell/gap-buffer.mu.html#L238'>delete-before-gap</a></span> _self: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="Delimiter">{</span>
+<span id="L239" class="LineNr">239 </span>  <span class="PreProc">var</span> self/<span class="Constant">eax</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> copy _self
+<span id="L240" class="LineNr">240 </span>  <span class="PreProc">var</span> left/<span class="Constant">eax</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get self, left
+<span id="L241" class="LineNr">241 </span>  <span class="PreProc">var</span> dummy/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='shell/grapheme-stack.mu.html#L46'>pop-grapheme-stack</a> left
+<span id="L242" class="LineNr">242 </span><span class="Delimiter">}</span>
+<span id="L243" class="LineNr">243 </span>
+<span id="L244" class="LineNr">244 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='shell/gap-buffer.mu.html#L244'>pop-after-gap</a></span> _self: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>)<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: grapheme <span class="Delimiter">{</span>
+<span id="L245" class="LineNr">245 </span>  <span class="PreProc">var</span> self/<span class="Constant">eax</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> copy _self
+<span id="L246" class="LineNr">246 </span>  <span class="PreProc">var</span> right/<span class="Constant">eax</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get self, right
+<span id="L247" class="LineNr">247 </span>  <span class="PreProc">var</span> result/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='shell/grapheme-stack.mu.html#L46'>pop-grapheme-stack</a> right
+<span id="L248" class="LineNr">248 </span>  <span class="PreProc">return</span> result
+<span id="L249" class="LineNr">249 </span><span class="Delimiter">}</span>
+<span id="L250" class="LineNr">250 </span>
+<span id="L251" class="LineNr">251 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='shell/gap-buffer.mu.html#L251'>gap-buffer-equal?</a></span> _self: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>), s: (addr array byte)<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: boolean <span class="Delimiter">{</span>
+<span id="L252" class="LineNr">252 </span>  <span class="PreProc">var</span> self/<span class="Constant">esi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> copy _self
+<span id="L253" class="LineNr">253 </span>  <span class="muComment"># complication: graphemes may be multiple bytes</span>
+<span id="L254" class="LineNr">254 </span>  <span class="muComment"># so don't rely on length</span>
+<span id="L255" class="LineNr">255 </span>  <span class="muComment"># instead turn the expected result into a stream and arrange to read from it in order</span>
+<span id="L256" class="LineNr">256 </span>  <span class="PreProc">var</span> stream-storage: (stream byte <span class="Constant">0x10</span>/max-word-size)
+<span id="L257" class="LineNr">257 </span>  <span class="PreProc">var</span> expected-stream/<span class="Constant">ecx</span>: (addr stream byte) <span class="SpecialChar">&lt;-</span> address stream-storage
+<span id="L258" class="LineNr">258 </span>  <a href='108write.subx.html#L11'>write</a> expected-stream, s
+<span id="L259" class="LineNr">259 </span>  <span class="muComment"># compare left</span>
+<span id="L260" class="LineNr">260 </span>  <span class="PreProc">var</span> left/<span class="Constant">edx</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get self, left
+<span id="L261" class="LineNr">261 </span>  <span class="PreProc">var</span> result/<span class="Constant">eax</span>: boolean <span class="SpecialChar">&lt;-</span> <a href='shell/grapheme-stack.mu.html#L168'>prefix-match?</a> left, expected-stream
+<span id="L262" class="LineNr">262 </span>  compare result, <span class="Constant">0</span>/false
+<span id="L263" class="LineNr">263 </span>  <span class="Delimiter">{</span>
+<span id="L264" class="LineNr">264 </span>    <span class="PreProc">break-if-!=</span>
+<span id="L265" class="LineNr">265 </span>    <span class="PreProc">return</span> result
+<span id="L266" class="LineNr">266 </span>  <span class="Delimiter">}</span>
+<span id="L267" class="LineNr">267 </span>  <span class="muComment"># compare right</span>
+<span id="L268" class="LineNr">268 </span>  <span class="PreProc">var</span> right/<span class="Constant">edx</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get self, right
+<span id="L269" class="LineNr">269 </span>  result <span class="SpecialChar">&lt;-</span> <a href='shell/grapheme-stack.mu.html#L196'>suffix-match?</a> right, expected-stream
+<span id="L270" class="LineNr">270 </span>  compare result, <span class="Constant">0</span>/false
+<span id="L271" class="LineNr">271 </span>  <span class="Delimiter">{</span>
+<span id="L272" class="LineNr">272 </span>    <span class="PreProc">break-if-!=</span>
+<span id="L273" class="LineNr">273 </span>    <span class="PreProc">return</span> result
+<span id="L274" class="LineNr">274 </span>  <span class="Delimiter">}</span>
+<span id="L275" class="LineNr">275 </span>  <span class="muComment"># ensure there's nothing left over</span>
+<span id="L276" class="LineNr">276 </span>  result <span class="SpecialChar">&lt;-</span> <a href='309stream.subx.html#L6'>stream-empty?</a> expected-stream
+<span id="L277" class="LineNr">277 </span>  <span class="PreProc">return</span> result
+<span id="L278" class="LineNr">278 </span><span class="Delimiter">}</span>
+<span id="L279" class="LineNr">279 </span>
+<span id="L280" class="LineNr">280 </span><span class="PreProc">fn</span> <span class="muTest"><a href='shell/gap-buffer.mu.html#L280'>test-gap-buffer-equal-from-end</a></span> <span class="Delimiter">{</span>
+<span id="L281" class="LineNr">281 </span>  <span class="PreProc">var</span> _g: <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>
+<span id="L282" class="LineNr">282 </span>  <span class="PreProc">var</span> g/<span class="Constant">esi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> address _g
+<span id="L283" class="LineNr">283 </span>  <a href='shell/gap-buffer.mu.html#L9'>initialize-gap-buffer</a> g
+<span id="L284" class="LineNr">284 </span>  <span class="muComment">#</span>
+<span id="L285" class="LineNr">285 </span>  <span class="PreProc">var</span> c/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0x61</span>/a
+<span id="L286" class="LineNr">286 </span>  <a href='shell/gap-buffer.mu.html#L118'>add-grapheme-at-gap</a> g, c
+<span id="L287" class="LineNr">287 </span>  <a href='shell/gap-buffer.mu.html#L118'>add-grapheme-at-gap</a> g, c
+<span id="L288" class="LineNr">288 </span>  <a href='shell/gap-buffer.mu.html#L118'>add-grapheme-at-gap</a> g, c
+<span id="L289" class="LineNr">289 </span>  <span class="muComment"># gap is at end (right is empty)</span>
+<span id="L290" class="LineNr">290 </span>  <span class="PreProc">var</span> result/<span class="Constant">eax</span>: boolean <span class="SpecialChar">&lt;-</span> <a href='shell/gap-buffer.mu.html#L251'>gap-buffer-equal?</a> g, <span class="Constant">&quot;aaa&quot;</span>
+<span id="L291" class="LineNr">291 </span>  <a href='502test.mu.html#L18'>check</a> result, <span class="Constant">&quot;F - test-gap-buffer-equal-from-end&quot;</span>
+<span id="L292" class="LineNr">292 </span><span class="Delimiter">}</span>
+<span id="L293" class="LineNr">293 </span>
+<span id="L294" class="LineNr">294 </span><span class="PreProc">fn</span> <span class="muTest"><a href='shell/gap-buffer.mu.html#L294'>test-gap-buffer-equal-from-middle</a></span> <span class="Delimiter">{</span>
+<span id="L295" class="LineNr">295 </span>  <span class="PreProc">var</span> _g: <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>
+<span id="L296" class="LineNr">296 </span>  <span class="PreProc">var</span> g/<span class="Constant">esi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> address _g
+<span id="L297" class="LineNr">297 </span>  <a href='shell/gap-buffer.mu.html#L9'>initialize-gap-buffer</a> g
+<span id="L298" class="LineNr">298 </span>  <span class="muComment">#</span>
+<span id="L299" class="LineNr">299 </span>  <span class="PreProc">var</span> c/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0x61</span>/a
+<span id="L300" class="LineNr">300 </span>  <a href='shell/gap-buffer.mu.html#L118'>add-grapheme-at-gap</a> g, c
+<span id="L301" class="LineNr">301 </span>  <a href='shell/gap-buffer.mu.html#L118'>add-grapheme-at-gap</a> g, c
+<span id="L302" class="LineNr">302 </span>  <a href='shell/gap-buffer.mu.html#L118'>add-grapheme-at-gap</a> g, c
+<span id="L303" class="LineNr">303 </span>  <span class="PreProc">var</span> dummy/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='shell/gap-buffer.mu.html#L168'>gap-left</a> g
+<span id="L304" class="LineNr">304 </span>  <span class="muComment"># gap is in the middle</span>
+<span id="L305" class="LineNr">305 </span>  <span class="PreProc">var</span> result/<span class="Constant">eax</span>: boolean <span class="SpecialChar">&lt;-</span> <a href='shell/gap-buffer.mu.html#L251'>gap-buffer-equal?</a> g, <span class="Constant">&quot;aaa&quot;</span>
+<span id="L306" class="LineNr">306 </span>  <a href='502test.mu.html#L18'>check</a> result, <span class="Constant">&quot;F - test-gap-buffer-equal-from-middle&quot;</span>
+<span id="L307" class="LineNr">307 </span><span class="Delimiter">}</span>
+<span id="L308" class="LineNr">308 </span>
+<span id="L309" class="LineNr">309 </span><span class="PreProc">fn</span> <span class="muTest"><a href='shell/gap-buffer.mu.html#L309'>test-gap-buffer-equal-from-start</a></span> <span class="Delimiter">{</span>
+<span id="L310" class="LineNr">310 </span>  <span class="PreProc">var</span> _g: <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>
+<span id="L311" class="LineNr">311 </span>  <span class="PreProc">var</span> g/<span class="Constant">esi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> address _g
+<span id="L312" class="LineNr">312 </span>  <a href='shell/gap-buffer.mu.html#L9'>initialize-gap-buffer</a> g
+<span id="L313" class="LineNr">313 </span>  <span class="muComment">#</span>
+<span id="L314" class="LineNr">314 </span>  <span class="PreProc">var</span> c/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0x61</span>/a
+<span id="L315" class="LineNr">315 </span>  <a href='shell/gap-buffer.mu.html#L118'>add-grapheme-at-gap</a> g, c
+<span id="L316" class="LineNr">316 </span>  <a href='shell/gap-buffer.mu.html#L118'>add-grapheme-at-gap</a> g, c
+<span id="L317" class="LineNr">317 </span>  <a href='shell/gap-buffer.mu.html#L118'>add-grapheme-at-gap</a> g, c
+<span id="L318" class="LineNr">318 </span>  <span class="PreProc">var</span> dummy/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='shell/gap-buffer.mu.html#L168'>gap-left</a> g
+<span id="L319" class="LineNr">319 </span>  dummy <span class="SpecialChar">&lt;-</span> <a href='shell/gap-buffer.mu.html#L168'>gap-left</a> g
+<span id="L320" class="LineNr">320 </span>  dummy <span class="SpecialChar">&lt;-</span> <a href='shell/gap-buffer.mu.html#L168'>gap-left</a> g
+<span id="L321" class="LineNr">321 </span>  <span class="muComment"># gap is at the start</span>
+<span id="L322" class="LineNr">322 </span>  <span class="PreProc">var</span> result/<span class="Constant">eax</span>: boolean <span class="SpecialChar">&lt;-</span> <a href='shell/gap-buffer.mu.html#L251'>gap-buffer-equal?</a> g, <span class="Constant">&quot;aaa&quot;</span>
+<span id="L323" class="LineNr">323 </span>  <a href='502test.mu.html#L18'>check</a> result, <span class="Constant">&quot;F - test-gap-buffer-equal-from-start&quot;</span>
+<span id="L324" class="LineNr">324 </span><span class="Delimiter">}</span>
+<span id="L325" class="LineNr">325 </span>
+<span id="L326" class="LineNr">326 </span><span class="PreProc">fn</span> <span class="muTest"><a href='shell/gap-buffer.mu.html#L326'>test-gap-buffer-equal-fails</a></span> <span class="Delimiter">{</span>
+<span id="L327" class="LineNr">327 </span>  <span class="muComment"># g = &quot;aaa&quot;</span>
+<span id="L328" class="LineNr">328 </span>  <span class="PreProc">var</span> _g: <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>
+<span id="L329" class="LineNr">329 </span>  <span class="PreProc">var</span> g/<span class="Constant">esi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> address _g
+<span id="L330" class="LineNr">330 </span>  <a href='shell/gap-buffer.mu.html#L9'>initialize-gap-buffer</a> g
+<span id="L331" class="LineNr">331 </span>  <span class="PreProc">var</span> c/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0x61</span>/a
+<span id="L332" class="LineNr">332 </span>  <a href='shell/gap-buffer.mu.html#L118'>add-grapheme-at-gap</a> g, c
+<span id="L333" class="LineNr">333 </span>  <a href='shell/gap-buffer.mu.html#L118'>add-grapheme-at-gap</a> g, c
+<span id="L334" class="LineNr">334 </span>  <a href='shell/gap-buffer.mu.html#L118'>add-grapheme-at-gap</a> g, c
+<span id="L335" class="LineNr">335 </span>  <span class="muComment">#</span>
+<span id="L336" class="LineNr">336 </span>  <span class="PreProc">var</span> result/<span class="Constant">eax</span>: boolean <span class="SpecialChar">&lt;-</span> <a href='shell/gap-buffer.mu.html#L251'>gap-buffer-equal?</a> g, <span class="Constant">&quot;aa&quot;</span>
+<span id="L337" class="LineNr">337 </span>  <a href='502test.mu.html#L30'>check-not</a> result, <span class="Constant">&quot;F - test-gap-buffer-equal-fails&quot;</span>
+<span id="L338" class="LineNr">338 </span><span class="Delimiter">}</span>
+<span id="L339" class="LineNr">339 </span>
+<span id="L340" class="LineNr">340 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='shell/gap-buffer.mu.html#L340'>gap-buffers-equal?</a></span> self: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>), g: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>)<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: boolean <span class="Delimiter">{</span>
+<span id="L341" class="LineNr">341 </span>  <span class="PreProc">var</span> tmp/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> <a href='shell/gap-buffer.mu.html#L106'>gap-buffer-length</a> self
+<span id="L342" class="LineNr">342 </span>  <span class="PreProc">var</span> len/<span class="Constant">ecx</span>: int <span class="SpecialChar">&lt;-</span> copy tmp
+<span id="L343" class="LineNr">343 </span>  <span class="PreProc">var</span> leng/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> <a href='shell/gap-buffer.mu.html#L106'>gap-buffer-length</a> g
+<span id="L344" class="LineNr">344 </span>  compare len, leng
+<span id="L345" class="LineNr">345 </span>  <span class="Delimiter">{</span>
+<span id="L346" class="LineNr">346 </span>    <span class="PreProc">break-if-=</span>
+<span id="L347" class="LineNr">347 </span>    <span class="PreProc">return</span> <span class="Constant">0</span>/false
+<span id="L348" class="LineNr">348 </span>  <span class="Delimiter">}</span>
+<span id="L349" class="LineNr">349 </span>  <span class="PreProc">var</span> i/<span class="Constant">edx</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0</span>
+<span id="L350" class="LineNr">350 </span>  <span class="Delimiter">{</span>
+<span id="L351" class="LineNr">351 </span>    compare i, len
+<span id="L352" class="LineNr">352 </span>    <span class="PreProc">break-if-&gt;=</span>
+<span id="L353" class="LineNr">353 </span>    <span class="Delimiter">{</span>
+<span id="L354" class="LineNr">354 </span>      <span class="PreProc">var</span> tmp/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='shell/gap-buffer.mu.html#L367'>gap-index</a> self, i
+<span id="L355" class="LineNr">355 </span>      <span class="PreProc">var</span> curr/<span class="Constant">ecx</span>: grapheme <span class="SpecialChar">&lt;-</span> copy tmp
+<span id="L356" class="LineNr">356 </span>      <span class="PreProc">var</span> currg/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='shell/gap-buffer.mu.html#L367'>gap-index</a> g, i
+<span id="L357" class="LineNr">357 </span>      compare curr, currg
+<span id="L358" class="LineNr">358 </span>      <span class="PreProc">break-if-=</span>
+<span id="L359" class="LineNr">359 </span>      <span class="PreProc">return</span> <span class="Constant">0</span>/false
+<span id="L360" class="LineNr">360 </span>    <span class="Delimiter">}</span>
+<span id="L361" class="LineNr">361 </span>    i <span class="SpecialChar">&lt;-</span> increment
+<span id="L362" class="LineNr">362 </span>    <span class="PreProc">loop</span>
+<span id="L363" class="LineNr">363 </span>  <span class="Delimiter">}</span>
+<span id="L364" class="LineNr">364 </span>  <span class="PreProc">return</span> <span class="Constant">1</span>/true
+<span id="L365" class="LineNr">365 </span><span class="Delimiter">}</span>
+<span id="L366" class="LineNr">366 </span>
+<span id="L367" class="LineNr">367 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='shell/gap-buffer.mu.html#L367'>gap-index</a></span> _self: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>), _n: int<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: grapheme <span class="Delimiter">{</span>
+<span id="L368" class="LineNr">368 </span>  <span class="PreProc">var</span> self/<span class="Constant">esi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> copy _self
+<span id="L369" class="LineNr">369 </span>  <span class="PreProc">var</span> n/<span class="Constant">ebx</span>: int <span class="SpecialChar">&lt;-</span> copy _n
+<span id="L370" class="LineNr">370 </span>  <span class="muComment"># if n &lt; left-&gt;length, index into left</span>
+<span id="L371" class="LineNr">371 </span>  <span class="PreProc">var</span> left/<span class="Constant">edi</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get self, left
+<span id="L372" class="LineNr">372 </span>  <span class="PreProc">var</span> left-len-a/<span class="Constant">edx</span>: (addr int) <span class="SpecialChar">&lt;-</span> get left, top
+<span id="L373" class="LineNr">373 </span>  compare n, *left-len-a
+<span id="L374" class="LineNr">374 </span>  <span class="Delimiter">{</span>
+<span id="L375" class="LineNr">375 </span>    <span class="PreProc">break-if-&gt;=</span>
+<span id="L376" class="LineNr">376 </span>    <span class="PreProc">var</span> data-ah/<span class="Constant">eax</span>: (addr handle array grapheme) <span class="SpecialChar">&lt;-</span> get left, data
+<span id="L377" class="LineNr">377 </span>    <span class="PreProc">var</span> data/<span class="Constant">eax</span>: (addr array grapheme) <span class="SpecialChar">&lt;-</span> <a href='120allocate.subx.html#L226'>lookup</a> *data-ah
+<span id="L378" class="LineNr">378 </span>    <span class="PreProc">var</span> result/<span class="Constant">eax</span>: (addr grapheme) <span class="SpecialChar">&lt;-</span> index data, n
+<span id="L379" class="LineNr">379 </span>    <span class="PreProc">return</span> *result
+<span id="L380" class="LineNr">380 </span>  <span class="Delimiter">}</span>
+<span id="L381" class="LineNr">381 </span>  <span class="muComment"># shrink n</span>
+<span id="L382" class="LineNr">382 </span>  n <span class="SpecialChar">&lt;-</span> subtract *left-len-a
+<span id="L383" class="LineNr">383 </span>  <span class="muComment"># if n &lt; right-&gt;length, index into right</span>
+<span id="L384" class="LineNr">384 </span>  <span class="PreProc">var</span> right/<span class="Constant">edi</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get self, right
+<span id="L385" class="LineNr">385 </span>  <span class="PreProc">var</span> right-len-a/<span class="Constant">edx</span>: (addr int) <span class="SpecialChar">&lt;-</span> get right, top
+<span id="L386" class="LineNr">386 </span>  compare n, *right-len-a
+<span id="L387" class="LineNr">387 </span>  <span class="Delimiter">{</span>
+<span id="L388" class="LineNr">388 </span>    <span class="PreProc">break-if-&gt;=</span>
+<span id="L389" class="LineNr">389 </span>    <span class="PreProc">var</span> data-ah/<span class="Constant">eax</span>: (addr handle array grapheme) <span class="SpecialChar">&lt;-</span> get right, data
+<span id="L390" class="LineNr">390 </span>    <span class="PreProc">var</span> data/<span class="Constant">eax</span>: (addr array grapheme) <span class="SpecialChar">&lt;-</span> <a href='120allocate.subx.html#L226'>lookup</a> *data-ah
+<span id="L391" class="LineNr">391 </span>    <span class="PreProc">var</span> result/<span class="Constant">eax</span>: (addr grapheme) <span class="SpecialChar">&lt;-</span> index data, n
+<span id="L392" class="LineNr">392 </span>    <span class="PreProc">return</span> *result
+<span id="L393" class="LineNr">393 </span>  <span class="Delimiter">}</span>
+<span id="L394" class="LineNr">394 </span>  <span class="muComment"># error</span>
+<span id="L395" class="LineNr">395 </span>  <a href='501draw-text.mu.html#L519'>abort</a> <span class="Constant">&quot;gap-index: out of bounds&quot;</span>
+<span id="L396" class="LineNr">396 </span>  <span class="PreProc">return</span> <span class="Constant">0</span>
+<span id="L397" class="LineNr">397 </span><span class="Delimiter">}</span>
+<span id="L398" class="LineNr">398 </span>
+<span id="L399" class="LineNr">399 </span><span class="PreProc">fn</span> <span class="muTest"><a href='shell/gap-buffer.mu.html#L399'>test-gap-buffers-equal?</a></span> <span class="Delimiter">{</span>
+<span id="L400" class="LineNr">400 </span>  <span class="PreProc">var</span> _a: <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>
+<span id="L401" class="LineNr">401 </span>  <span class="PreProc">var</span> a/<span class="Constant">esi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> address _a
+<span id="L402" class="LineNr">402 </span>  <a href='shell/gap-buffer.mu.html#L18'>initialize-gap-buffer-with</a> a, <span class="Constant">&quot;abc&quot;</span>
+<span id="L403" class="LineNr">403 </span>  <span class="PreProc">var</span> _b: <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>
+<span id="L404" class="LineNr">404 </span>  <span class="PreProc">var</span> b/<span class="Constant">edi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> address _b
+<span id="L405" class="LineNr">405 </span>  <a href='shell/gap-buffer.mu.html#L18'>initialize-gap-buffer-with</a> b, <span class="Constant">&quot;abc&quot;</span>
+<span id="L406" class="LineNr">406 </span>  <span class="PreProc">var</span> _c: <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>
+<span id="L407" class="LineNr">407 </span>  <span class="PreProc">var</span> c/<span class="Constant">ebx</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> address _c
+<span id="L408" class="LineNr">408 </span>  <a href='shell/gap-buffer.mu.html#L18'>initialize-gap-buffer-with</a> c, <span class="Constant">&quot;ab&quot;</span>
+<span id="L409" class="LineNr">409 </span>  <span class="PreProc">var</span> _d: <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>
+<span id="L410" class="LineNr">410 </span>  <span class="PreProc">var</span> d/<span class="Constant">edx</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> address _d
+<span id="L411" class="LineNr">411 </span>  <a href='shell/gap-buffer.mu.html#L18'>initialize-gap-buffer-with</a> d, <span class="Constant">&quot;abd&quot;</span>
+<span id="L412" class="LineNr">412 </span>  <span class="muComment">#</span>
+<span id="L413" class="LineNr">413 </span>  <span class="PreProc">var</span> result/<span class="Constant">eax</span>: boolean <span class="SpecialChar">&lt;-</span> <a href='shell/gap-buffer.mu.html#L340'>gap-buffers-equal?</a> a, a
+<span id="L414" class="LineNr">414 </span>  <a href='502test.mu.html#L18'>check</a> result, <span class="Constant">&quot;F - <a href='shell/gap-buffer.mu.html#L399'>test-gap-buffers-equal?</a> - reflexive&quot;</span>
+<span id="L415" class="LineNr">415 </span>  result <span class="SpecialChar">&lt;-</span> <a href='shell/gap-buffer.mu.html#L340'>gap-buffers-equal?</a> a, b
+<span id="L416" class="LineNr">416 </span>  <a href='502test.mu.html#L18'>check</a> result, <span class="Constant">&quot;F - <a href='shell/gap-buffer.mu.html#L399'>test-gap-buffers-equal?</a> - equal&quot;</span>
+<span id="L417" class="LineNr">417 </span>  <span class="muComment"># length not equal</span>
+<span id="L418" class="LineNr">418 </span>  result <span class="SpecialChar">&lt;-</span> <a href='shell/gap-buffer.mu.html#L340'>gap-buffers-equal?</a> a, c
+<span id="L419" class="LineNr">419 </span>  <a href='502test.mu.html#L30'>check-not</a> result, <span class="Constant">&quot;F - <a href='shell/gap-buffer.mu.html#L399'>test-gap-buffers-equal?</a> - not equal&quot;</span>
+<span id="L420" class="LineNr">420 </span>  <span class="muComment"># contents not equal</span>
+<span id="L421" class="LineNr">421 </span>  result <span class="SpecialChar">&lt;-</span> <a href='shell/gap-buffer.mu.html#L340'>gap-buffers-equal?</a> a, d
+<span id="L422" class="LineNr">422 </span>  <a href='502test.mu.html#L30'>check-not</a> result, <span class="Constant">&quot;F - <a href='shell/gap-buffer.mu.html#L399'>test-gap-buffers-equal?</a> - not equal 2&quot;</span>
+<span id="L423" class="LineNr">423 </span>  result <span class="SpecialChar">&lt;-</span> <a href='shell/gap-buffer.mu.html#L340'>gap-buffers-equal?</a> d, a
+<span id="L424" class="LineNr">424 </span>  <a href='502test.mu.html#L30'>check-not</a> result, <span class="Constant">&quot;F - <a href='shell/gap-buffer.mu.html#L399'>test-gap-buffers-equal?</a> - not equal 3&quot;</span>
+<span id="L425" class="LineNr">425 </span><span class="Delimiter">}</span>
+<span id="L426" class="LineNr">426 </span>
+<span id="L427" class="LineNr">427 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='shell/gap-buffer.mu.html#L427'>copy-gap-buffer</a></span> _src-ah: (addr handle <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>), _dest-ah: (addr handle <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="Delimiter">{</span>
+<span id="L428" class="LineNr">428 </span>  <span class="muComment"># obtain src-a, dest-a</span>
+<span id="L429" class="LineNr">429 </span>  <span class="PreProc">var</span> src-ah/<span class="Constant">eax</span>: (addr handle <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> copy _src-ah
+<span id="L430" class="LineNr">430 </span>  <span class="PreProc">var</span> _src-a/<span class="Constant">eax</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> <a href='120allocate.subx.html#L226'>lookup</a> *src-ah
+<span id="L431" class="LineNr">431 </span>  <span class="PreProc">var</span> src-a/<span class="Constant">esi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> copy _src-a
+<span id="L432" class="LineNr">432 </span>  <span class="PreProc">var</span> dest-ah/<span class="Constant">eax</span>: (addr handle <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> copy _dest-ah
+<span id="L433" class="LineNr">433 </span>  <span class="PreProc">var</span> _dest-a/<span class="Constant">eax</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> <a href='120allocate.subx.html#L226'>lookup</a> *dest-ah
+<span id="L434" class="LineNr">434 </span>  <span class="PreProc">var</span> dest-a/<span class="Constant">edi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> copy _dest-a
+<span id="L435" class="LineNr">435 </span>  <span class="muComment"># copy left grapheme-stack</span>
+<span id="L436" class="LineNr">436 </span>  <span class="PreProc">var</span> src/<span class="Constant">ecx</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get src-a, left
+<span id="L437" class="LineNr">437 </span>  <span class="PreProc">var</span> dest/<span class="Constant">edx</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get dest-a, left
+<span id="L438" class="LineNr">438 </span>  <a href='shell/grapheme-stack.mu.html#L62'>copy-grapheme-stack</a> src, dest
+<span id="L439" class="LineNr">439 </span>  <span class="muComment"># copy right grapheme-stack</span>
+<span id="L440" class="LineNr">440 </span>  src <span class="SpecialChar">&lt;-</span> get src-a, right
+<span id="L441" class="LineNr">441 </span>  dest <span class="SpecialChar">&lt;-</span> get dest-a, right
+<span id="L442" class="LineNr">442 </span>  <a href='shell/grapheme-stack.mu.html#L62'>copy-grapheme-stack</a> src, dest
+<span id="L443" class="LineNr">443 </span><span class="Delimiter">}</span>
+<span id="L444" class="LineNr">444 </span>
+<span id="L445" class="LineNr">445 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='shell/gap-buffer.mu.html#L445'>gap-buffer-is-decimal-integer?</a></span> _self: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>)<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: boolean <span class="Delimiter">{</span>
+<span id="L446" class="LineNr">446 </span>  <span class="PreProc">var</span> self/<span class="Constant">esi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> copy _self
+<span id="L447" class="LineNr">447 </span>  <span class="PreProc">var</span> curr/<span class="Constant">ecx</span>: (addr <a href='shell/grapheme-stack.mu.html#L4'>grapheme-stack</a>) <span class="SpecialChar">&lt;-</span> get self, left
+<span id="L448" class="LineNr">448 </span>  <span class="PreProc">var</span> result/<span class="Constant">eax</span>: boolean <span class="SpecialChar">&lt;-</span> <a href='shell/grapheme-stack.mu.html#L223'>grapheme-stack-is-decimal-integer?</a> curr
+<span id="L449" class="LineNr">449 </span>  <span class="Delimiter">{</span>
+<span id="L450" class="LineNr">450 </span>    compare result, <span class="Constant">0</span>/false
+<span id="L451" class="LineNr">451 </span>    <span class="PreProc">break-if-=</span>
+<span id="L452" class="LineNr">452 </span>    curr <span class="SpecialChar">&lt;-</span> get self, right
+<span id="L453" class="LineNr">453 </span>    result <span class="SpecialChar">&lt;-</span> <a href='shell/grapheme-stack.mu.html#L223'>grapheme-stack-is-decimal-integer?</a> curr
+<span id="L454" class="LineNr">454 </span>  <span class="Delimiter">}</span>
+<span id="L455" class="LineNr">455 </span>  <span class="PreProc">return</span> result
+<span id="L456" class="LineNr">456 </span><span class="Delimiter">}</span>
+<span id="L457" class="LineNr">457 </span>
+<span id="L458" class="LineNr">458 </span><span class="PreProc">fn</span> <span class="muTest"><a href='shell/gap-buffer.mu.html#L458'>test-render-gap-buffer-without-cursor</a></span> <span class="Delimiter">{</span>
+<span id="L459" class="LineNr">459 </span>  <span class="muComment"># setup</span>
+<span id="L460" class="LineNr">460 </span>  <span class="PreProc">var</span> gap-storage: <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>
+<span id="L461" class="LineNr">461 </span>  <span class="PreProc">var</span> gap/<span class="Constant">esi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> address gap-storage
+<span id="L462" class="LineNr">462 </span>  <a href='shell/gap-buffer.mu.html#L18'>initialize-gap-buffer-with</a> gap, <span class="Constant">&quot;abc&quot;</span>
+<span id="L463" class="LineNr">463 </span>  <span class="muComment"># setup: screen</span>
+<span id="L464" class="LineNr">464 </span>  <span class="PreProc">var</span> screen-on-stack: <a href='500text-screen.mu.html#L9'>screen</a>
+<span id="L465" class="LineNr">465 </span>  <span class="PreProc">var</span> <a href='500text-screen.mu.html#L9'>screen</a>/<span class="Constant">edi</span>: (addr <a href='500text-screen.mu.html#L9'>screen</a>) <span class="SpecialChar">&lt;-</span> address screen-on-stack
+<span id="L466" class="LineNr">466 </span>  <a href='500text-screen.mu.html#L23'>initialize-screen</a> <a href='500text-screen.mu.html#L9'>screen</a>, <span class="Constant">5</span>, <span class="Constant">4</span>
+<span id="L467" class="LineNr">467 </span>  <span class="muComment">#</span>
+<span id="L468" class="LineNr">468 </span>  <span class="PreProc">var</span> x/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> <a href='shell/gap-buffer.mu.html#L81'>render-gap-buffer</a> <a href='500text-screen.mu.html#L9'>screen</a>, gap, <span class="Constant">0</span>/x, <span class="Constant">0</span>/y, <span class="Constant">0</span>/no-cursor
+<span id="L469" class="LineNr">469 </span>  <a href='504test-screen.mu.html#L7'>check-screen-row</a> <a href='500text-screen.mu.html#L9'>screen</a>, <span class="Constant">0</span>/y, <span class="Constant">&quot;abc &quot;</span>, <span class="Constant">&quot;F - test-render-gap-buffer-without-cursor&quot;</span>
+<span id="L470" class="LineNr">470 </span>  <a href='502test.mu.html#L2'>check-ints-equal</a> x, <span class="Constant">4</span>, <span class="Constant">&quot;F - <a href='shell/gap-buffer.mu.html#L458'>test-render-gap-buffer-without-cursor</a>: result&quot;</span>
+<span id="L471" class="LineNr">471 </span>                                                                <span class="muComment"># abc</span>
+<span id="L472" class="LineNr">472 </span>  <a href='504test-screen.mu.html#L245'>check-background-color-in-screen-row</a> <a href='500text-screen.mu.html#L9'>screen</a>, <span class="Constant">7</span>/bg=cursor, <span class="Constant">0</span>/y, <span class="Constant">&quot;    &quot;</span>, <span class="Constant">&quot;F - <a href='shell/gap-buffer.mu.html#L458'>test-render-gap-buffer-without-cursor</a>: bg&quot;</span>
+<span id="L473" class="LineNr">473 </span><span class="Delimiter">}</span>
+<span id="L474" class="LineNr">474 </span>
+<span id="L475" class="LineNr">475 </span><span class="PreProc">fn</span> <span class="muTest"><a href='shell/gap-buffer.mu.html#L475'>test-render-gap-buffer-with-cursor-at-end</a></span> <span class="Delimiter">{</span>
+<span id="L476" class="LineNr">476 </span>  <span class="muComment"># setup</span>
+<span id="L477" class="LineNr">477 </span>  <span class="PreProc">var</span> gap-storage: <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>
+<span id="L478" class="LineNr">478 </span>  <span class="PreProc">var</span> gap/<span class="Constant">esi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> address gap-storage
+<span id="L479" class="LineNr">479 </span>  <a href='shell/gap-buffer.mu.html#L18'>initialize-gap-buffer-with</a> gap, <span class="Constant">&quot;abc&quot;</span>
+<span id="L480" class="LineNr">480 </span>  <a href='shell/gap-buffer.mu.html#L132'>gap-to-end</a> gap
+<span id="L481" class="LineNr">481 </span>  <span class="muComment"># setup: screen</span>
+<span id="L482" class="LineNr">482 </span>  <span class="PreProc">var</span> screen-on-stack: <a href='500text-screen.mu.html#L9'>screen</a>
+<span id="L483" class="LineNr">483 </span>  <span class="PreProc">var</span> <a href='500text-screen.mu.html#L9'>screen</a>/<span class="Constant">edi</span>: (addr <a href='500text-screen.mu.html#L9'>screen</a>) <span class="SpecialChar">&lt;-</span> address screen-on-stack
+<span id="L484" class="LineNr">484 </span>  <a href='500text-screen.mu.html#L23'>initialize-screen</a> <a href='500text-screen.mu.html#L9'>screen</a>, <span class="Constant">5</span>, <span class="Constant">4</span>
+<span id="L485" class="LineNr">485 </span>  <span class="muComment">#</span>
+<span id="L486" class="LineNr">486 </span>  <span class="PreProc">var</span> x/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> <a href='shell/gap-buffer.mu.html#L81'>render-gap-buffer</a> <a href='500text-screen.mu.html#L9'>screen</a>, gap, <span class="Constant">0</span>/x, <span class="Constant">0</span>/y, <span class="Constant">1</span>/show-cursor
+<span id="L487" class="LineNr">487 </span>  <a href='504test-screen.mu.html#L7'>check-screen-row</a> <a href='500text-screen.mu.html#L9'>screen</a>, <span class="Constant">0</span>/y, <span class="Constant">&quot;abc &quot;</span>, <span class="Constant">&quot;F - test-render-gap-buffer-with-cursor-at-end&quot;</span>
+<span id="L488" class="LineNr">488 </span>  <span class="muComment"># we've drawn one extra grapheme for the cursor</span>
+<span id="L489" class="LineNr">489 </span>  <a href='502test.mu.html#L2'>check-ints-equal</a> x, <span class="Constant">4</span>, <span class="Constant">&quot;F - <a href='shell/gap-buffer.mu.html#L475'>test-render-gap-buffer-with-cursor-at-end</a>: result&quot;</span>
+<span id="L490" class="LineNr">490 </span>                                                                <span class="muComment"># abc</span>
+<span id="L491" class="LineNr">491 </span>  <a href='504test-screen.mu.html#L245'>check-background-color-in-screen-row</a> <a href='500text-screen.mu.html#L9'>screen</a>, <span class="Constant">7</span>/bg=cursor, <span class="Constant">0</span>/y, <span class="Constant">&quot;   |&quot;</span>, <span class="Constant">&quot;F - <a href='shell/gap-buffer.mu.html#L475'>test-render-gap-buffer-with-cursor-at-end</a>: bg&quot;</span>
+<span id="L492" class="LineNr">492 </span><span class="Delimiter">}</span>
+<span id="L493" class="LineNr">493 </span>
+<span id="L494" class="LineNr">494 </span><span class="PreProc">fn</span> <span class="muTest"><a href='shell/gap-buffer.mu.html#L494'>test-render-gap-buffer-with-cursor-in-middle</a></span> <span class="Delimiter">{</span>
+<span id="L495" class="LineNr">495 </span>  <span class="muComment"># setup</span>
+<span id="L496" class="LineNr">496 </span>  <span class="PreProc">var</span> gap-storage: <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>
+<span id="L497" class="LineNr">497 </span>  <span class="PreProc">var</span> gap/<span class="Constant">esi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> address gap-storage
+<span id="L498" class="LineNr">498 </span>  <a href='shell/gap-buffer.mu.html#L18'>initialize-gap-buffer-with</a> gap, <span class="Constant">&quot;abc&quot;</span>
+<span id="L499" class="LineNr">499 </span>  <a href='shell/gap-buffer.mu.html#L132'>gap-to-end</a> gap
+<span id="L500" class="LineNr">500 </span>  <span class="PreProc">var</span> dummy/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='shell/gap-buffer.mu.html#L168'>gap-left</a> gap
+<span id="L501" class="LineNr">501 </span>  <span class="muComment"># setup: screen</span>
+<span id="L502" class="LineNr">502 </span>  <span class="PreProc">var</span> screen-on-stack: <a href='500text-screen.mu.html#L9'>screen</a>
+<span id="L503" class="LineNr">503 </span>  <span class="PreProc">var</span> <a href='500text-screen.mu.html#L9'>screen</a>/<span class="Constant">edi</span>: (addr <a href='500text-screen.mu.html#L9'>screen</a>) <span class="SpecialChar">&lt;-</span> address screen-on-stack
+<span id="L504" class="LineNr">504 </span>  <a href='500text-screen.mu.html#L23'>initialize-screen</a> <a href='500text-screen.mu.html#L9'>screen</a>, <span class="Constant">5</span>, <span class="Constant">4</span>
+<span id="L505" class="LineNr">505 </span>  <span class="muComment">#</span>
+<span id="L506" class="LineNr">506 </span>  <span class="PreProc">var</span> x/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> <a href='shell/gap-buffer.mu.html#L81'>render-gap-buffer</a> <a href='500text-screen.mu.html#L9'>screen</a>, gap, <span class="Constant">0</span>/x, <span class="Constant">0</span>/y, <span class="Constant">1</span>/show-cursor
+<span id="L507" class="LineNr">507 </span>  <a href='504test-screen.mu.html#L7'>check-screen-row</a> <a href='500text-screen.mu.html#L9'>screen</a>, <span class="Constant">0</span>/y, <span class="Constant">&quot;abc &quot;</span>, <span class="Constant">&quot;F - test-render-gap-buffer-with-cursor-in-middle&quot;</span>
+<span id="L508" class="LineNr">508 </span>  <a href='502test.mu.html#L2'>check-ints-equal</a> x, <span class="Constant">4</span>, <span class="Constant">&quot;F - <a href='shell/gap-buffer.mu.html#L494'>test-render-gap-buffer-with-cursor-in-middle</a>: result&quot;</span>
+<span id="L509" class="LineNr">509 </span>                                                                <span class="muComment"># abc</span>
+<span id="L510" class="LineNr">510 </span>  <a href='504test-screen.mu.html#L245'>check-background-color-in-screen-row</a> <a href='500text-screen.mu.html#L9'>screen</a>, <span class="Constant">7</span>/bg=cursor, <span class="Constant">0</span>/y, <span class="Constant">&quot;  | &quot;</span>, <span class="Constant">&quot;F - <a href='shell/gap-buffer.mu.html#L494'>test-render-gap-buffer-with-cursor-in-middle</a>: bg&quot;</span>
+<span id="L511" class="LineNr">511 </span><span class="Delimiter">}</span>
+<span id="L512" class="LineNr">512 </span>
+<span id="L513" class="LineNr">513 </span><span class="PreProc">fn</span> <span class="muTest"><a href='shell/gap-buffer.mu.html#L513'>test-render-gap-buffer-with-cursor-at-start</a></span> <span class="Delimiter">{</span>
+<span id="L514" class="LineNr">514 </span>  <span class="PreProc">var</span> gap-storage: <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>
+<span id="L515" class="LineNr">515 </span>  <span class="PreProc">var</span> gap/<span class="Constant">esi</span>: (addr <a href='shell/gap-buffer.mu.html#L4'>gap-buffer</a>) <span class="SpecialChar">&lt;-</span> address gap-storage
+<span id="L516" class="LineNr">516 </span>  <a href='shell/gap-buffer.mu.html#L18'>initialize-gap-buffer-with</a> gap, <span class="Constant">&quot;abc&quot;</span>
+<span id="L517" class="LineNr">517 </span>  <a href='shell/gap-buffer.mu.html#L124'>gap-to-start</a> gap
+<span id="L518" class="LineNr">518 </span>  <span class="muComment"># setup: screen</span>
+<span id="L519" class="LineNr">519 </span>  <span class="PreProc">var</span> screen-on-stack: <a href='500text-screen.mu.html#L9'>screen</a>
+<span id="L520" class="LineNr">520 </span>  <span class="PreProc">var</span> <a href='500text-screen.mu.html#L9'>screen</a>/<span class="Constant">edi</span>: (addr <a href='500text-screen.mu.html#L9'>screen</a>) <span class="SpecialChar">&lt;-</span> address screen-on-stack
+<span id="L521" class="LineNr">521 </span>  <a href='500text-screen.mu.html#L23'>initialize-screen</a> <a href='500text-screen.mu.html#L9'>screen</a>, <span class="Constant">5</span>, <span class="Constant">4</span>
+<span id="L522" class="LineNr">522 </span>  <span class="muComment">#</span>
+<span id="L523" class="LineNr">523 </span>  <span class="PreProc">var</span> x/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> <a href='shell/gap-buffer.mu.html#L81'>render-gap-buffer</a> <a href='500text-screen.mu.html#L9'>screen</a>, gap, <span class="Constant">0</span>/x, <span class="Constant">0</span>/y, <span class="Constant">1</span>/show-cursor
+<span id="L524" class="LineNr">524 </span>  <a href='504test-screen.mu.html#L7'>check-screen-row</a> <a href='500text-screen.mu.html#L9'>screen</a>, <span class="Constant">0</span>/y, <span class="Constant">&quot;abc &quot;</span>, <span class="Constant">&quot;F - test-render-gap-buffer-with-cursor-at-start&quot;</span>
+<span id="L525" class="LineNr">525 </span>  <a href='502test.mu.html#L2'>check-ints-equal</a> x, <span class="Constant">4</span>, <span class="Constant">&quot;F - <a href='shell/gap-buffer.mu.html#L513'>test-render-gap-buffer-with-cursor-at-start</a>: result&quot;</span>
+<span id="L526" class="LineNr">526 </span>                                                                <span class="muComment"># abc</span>
+<span id="L527" class="LineNr">527 </span>  <a href='504test-screen.mu.html#L245'>check-background-color-in-screen-row</a> <a href='500text-screen.mu.html#L9'>screen</a>, <span class="Constant">7</span>/bg=cursor, <span class="Constant">0</span>/y, <span class="Constant">&quot;|   &quot;</span>, <span class="Constant">&quot;F - <a href='shell/gap-buffer.mu.html#L513'>test-render-gap-buffer-with-cursor-at-start</a>: bg&quot;</span>
+<span id="L528" class="LineNr">528 </span><span class="Delimiter">}</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->