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diff --git a/html/403code-point.mu.html b/html/403code-point.mu.html new file mode 100644 index 00000000..88f29561 --- /dev/null +++ b/html/403code-point.mu.html @@ -0,0 +1,225 @@ +<!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 - 403code-point.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; } +.muTest { color: #5f8700; } +.LineNr { } +.muFunction { color: #af5f00; text-decoration: underline; } +.SpecialChar { color: #d70000; } +.CommentedCode { color: #8a8a8a; } +.Comment { color: #005faf; } +.Constant { color: #008787; } +.Delimiter { color: #c000c0; } +.PreProc { color: #c000c0; } +--> +</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/master/403code-point.mu'>https://github.com/akkartik/mu/blob/master/403code-point.mu</a> +<pre id='vimCodeElement'> +<span id="L1" class="LineNr"> 1 </span><span class="Comment"># Helpers for Unicode "code points".</span> +<span id="L2" class="LineNr"> 2 </span><span class="Comment"># <a href="https://en.wikipedia.org/wiki/Code_point">https://en.wikipedia.org/wiki/Code_point</a></span> +<span id="L3" class="LineNr"> 3 </span><span class="Comment">#</span> +<span id="L4" class="LineNr"> 4 </span><span class="Comment"># Mu has no characters, only code points and graphemes.</span> +<span id="L5" class="LineNr"> 5 </span><span class="Comment"># Code points are the indivisible atoms of text streams.</span> +<span id="L6" class="LineNr"> 6 </span><span class="Comment"># Graphemes are the smallest self-contained unit of text.</span> +<span id="L7" class="LineNr"> 7 </span><span class="Comment"># Graphemes may consist of multiple code points.</span> +<span id="L8" class="LineNr"> 8 </span><span class="Comment">#</span> +<span id="L9" class="LineNr"> 9 </span><span class="Comment"># Mu graphemes are always represented in utf-8, and they are required to fit</span> +<span id="L10" class="LineNr"> 10 </span><span class="Comment"># in 4 bytes.</span> +<span id="L11" class="LineNr"> 11 </span><span class="Comment">#</span> +<span id="L12" class="LineNr"> 12 </span><span class="Comment"># Mu doesn't currently support combining code points, or graphemes made of</span> +<span id="L13" class="LineNr"> 13 </span><span class="Comment"># multiple code points. One day we will.</span> +<span id="L14" class="LineNr"> 14 </span> +<span id="L15" class="LineNr"> 15 </span><span class="Comment"># transliterated from tb_utf8_unicode_to_char in <a href="https://github.com/nsf/termbox">https://github.com/nsf/termbox</a></span> +<span id="L16" class="LineNr"> 16 </span><span class="Comment"># <a href="https://wiki.tcl-lang.org/page/UTF%2D8+bit+by+bit">https://wiki.tcl-lang.org/page/UTF%2D8+bit+by+bit</a> explains the algorithm</span> +<span id="L17" class="LineNr"> 17 </span><span class="Comment">#</span> +<span id="L18" class="LineNr"> 18 </span><span class="Comment"># The day we want to support combining characters, this function will need to</span> +<span id="L19" class="LineNr"> 19 </span><span class="Comment"># take multiple code points. Or something.</span> +<span id="L20" class="LineNr"> 20 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='403code-point.mu.html#L20'>to-grapheme</a></span> in: code-point<span class="PreProc"> -> </span>out/<span class="Constant">eax</span>: grapheme <span class="Delimiter">{</span> +<span id="L21" class="LineNr"> 21 </span>$to-grapheme:body: <span class="Delimiter">{</span> +<span id="L22" class="LineNr"> 22 </span> <span class="PreProc">var</span> c/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> copy in +<span id="L23" class="LineNr"> 23 </span> <span class="PreProc">var</span> num-trailers/<span class="Constant">ecx</span>: int <span class="SpecialChar"><-</span> copy <span class="Constant">0</span> +<span id="L24" class="LineNr"> 24 </span> <span class="PreProc">var</span> first/<span class="Constant">edx</span>: int <span class="SpecialChar"><-</span> copy <span class="Constant">0</span> +<span id="L25" class="LineNr"> 25 </span> $to-grapheme:compute-length: <span class="Delimiter">{</span> +<span id="L26" class="LineNr"> 26 </span> <span class="Comment"># single byte: just return it</span> +<span id="L27" class="LineNr"> 27 </span> compare c, <span class="Constant">0x7f</span> +<span id="L28" class="LineNr"> 28 </span> <span class="Delimiter">{</span> +<span id="L29" class="LineNr"> 29 </span> <span class="PreProc">break-if-></span> +<span id="L30" class="LineNr"> 30 </span> out <span class="SpecialChar"><-</span> copy c +<span id="L31" class="LineNr"> 31 </span> <span class="PreProc">break</span> $to-grapheme:body +<span id="L32" class="LineNr"> 32 </span> <span class="Delimiter">}</span> +<span id="L33" class="LineNr"> 33 </span> <span class="Comment"># 2 bytes</span> +<span id="L34" class="LineNr"> 34 </span> compare c, <span class="Constant">0x7ff</span> +<span id="L35" class="LineNr"> 35 </span> <span class="Delimiter">{</span> +<span id="L36" class="LineNr"> 36 </span> <span class="PreProc">break-if-></span> +<span id="L37" class="LineNr"> 37 </span> num-trailers <span class="SpecialChar"><-</span> copy <span class="Constant">1</span> +<span id="L38" class="LineNr"> 38 </span> first <span class="SpecialChar"><-</span> copy <span class="Constant">0xc0</span> +<span id="L39" class="LineNr"> 39 </span> <span class="PreProc">break</span> $to-grapheme:compute-length +<span id="L40" class="LineNr"> 40 </span> <span class="Delimiter">}</span> +<span id="L41" class="LineNr"> 41 </span> <span class="Comment"># 3 bytes</span> +<span id="L42" class="LineNr"> 42 </span> compare c, <span class="Constant">0xffff</span> +<span id="L43" class="LineNr"> 43 </span> <span class="Delimiter">{</span> +<span id="L44" class="LineNr"> 44 </span> <span class="PreProc">break-if-></span> +<span id="L45" class="LineNr"> 45 </span> num-trailers <span class="SpecialChar"><-</span> copy <span class="Constant">2</span> +<span id="L46" class="LineNr"> 46 </span> first <span class="SpecialChar"><-</span> copy <span class="Constant">0xe0</span> +<span id="L47" class="LineNr"> 47 </span> <span class="PreProc">break</span> $to-grapheme:compute-length +<span id="L48" class="LineNr"> 48 </span> <span class="Delimiter">}</span> +<span id="L49" class="LineNr"> 49 </span> <span class="Comment"># 4 bytes</span> +<span id="L50" class="LineNr"> 50 </span> compare c, <span class="Constant">0x1fffff</span> +<span id="L51" class="LineNr"> 51 </span> <span class="Delimiter">{</span> +<span id="L52" class="LineNr"> 52 </span> <span class="PreProc">break-if-></span> +<span id="L53" class="LineNr"> 53 </span> num-trailers <span class="SpecialChar"><-</span> copy <span class="Constant">3</span> +<span id="L54" class="LineNr"> 54 </span> first <span class="SpecialChar"><-</span> copy <span class="Constant">0xf0</span> +<span id="L55" class="LineNr"> 55 </span> <span class="PreProc">break</span> $to-grapheme:compute-length +<span id="L56" class="LineNr"> 56 </span> <span class="Delimiter">}</span> +<span id="L57" class="LineNr"> 57 </span> <span class="Comment"># more than 4 bytes: unsupported</span> +<span id="L58" class="LineNr"> 58 </span> compare c, <span class="Constant">0x1fffff</span> +<span id="L59" class="LineNr"> 59 </span> <span class="Delimiter">{</span> +<span id="L60" class="LineNr"> 60 </span> <span class="PreProc">break-if-></span> +<span id="L61" class="LineNr"> 61 </span> <a href='304screen.subx.html#L122'>print-string-to-real-screen</a> <span class="Constant">"unsupported code point "</span> +<span id="L62" class="LineNr"> 62 </span> <a href='304screen.subx.html#L200'>print-int32-hex-to-real-screen</a> c +<span id="L63" class="LineNr"> 63 </span> <a href='304screen.subx.html#L122'>print-string-to-real-screen</a> <span class="Constant">"\n"</span> +<span id="L64" class="LineNr"> 64 </span> <span class="PreProc">var</span> exit-status/<span class="Constant">ebx</span>: int <span class="SpecialChar"><-</span> copy <span class="Constant">1</span> +<span id="L65" class="LineNr"> 65 </span> syscall_exit +<span id="L66" class="LineNr"> 66 </span> <span class="Delimiter">}</span> +<span id="L67" class="LineNr"> 67 </span> <span class="Delimiter">}</span> +<span id="L68" class="LineNr"> 68 </span> <span class="Comment"># emit trailer bytes, 6 bits from 'in', first two bits '10'</span> +<span id="L69" class="LineNr"> 69 </span> <span class="PreProc">var</span> result/<span class="Constant">edi</span>: int <span class="SpecialChar"><-</span> copy <span class="Constant">0</span> +<span id="L70" class="LineNr"> 70 </span> <span class="Delimiter">{</span> +<span id="L71" class="LineNr"> 71 </span> compare num-trailers, <span class="Constant">0</span> +<span id="L72" class="LineNr"> 72 </span> <span class="PreProc">break-if-<=</span> +<span id="L73" class="LineNr"> 73 </span> <span class="PreProc">var</span> tmp/<span class="Constant">esi</span>: int <span class="SpecialChar"><-</span> copy c +<span id="L74" class="LineNr"> 74 </span> tmp <span class="SpecialChar"><-</span> and <span class="Constant">0x3f</span> +<span id="L75" class="LineNr"> 75 </span> tmp <span class="SpecialChar"><-</span> or <span class="Constant">0x80</span> +<span id="L76" class="LineNr"> 76 </span> result <span class="SpecialChar"><-</span> shift-left <span class="Constant">8</span> +<span id="L77" class="LineNr"> 77 </span> result <span class="SpecialChar"><-</span> or tmp +<span id="L78" class="LineNr"> 78 </span> <span class="Comment"># update loop state</span> +<span id="L79" class="LineNr"> 79 </span> c <span class="SpecialChar"><-</span> shift-right <span class="Constant">6</span> +<span id="L80" class="LineNr"> 80 </span> num-trailers <span class="SpecialChar"><-</span> decrement +<span id="L81" class="LineNr"> 81 </span> <span class="PreProc">loop</span> +<span id="L82" class="LineNr"> 82 </span> <span class="Delimiter">}</span> +<span id="L83" class="LineNr"> 83 </span> <span class="Comment"># emit engine</span> +<span id="L84" class="LineNr"> 84 </span> result <span class="SpecialChar"><-</span> shift-left <span class="Constant">8</span> +<span id="L85" class="LineNr"> 85 </span> result <span class="SpecialChar"><-</span> or c +<span id="L86" class="LineNr"> 86 </span> result <span class="SpecialChar"><-</span> or first +<span id="L87" class="LineNr"> 87 </span> <span class="Comment">#</span> +<span id="L88" class="LineNr"> 88 </span> out <span class="SpecialChar"><-</span> copy result +<span id="L89" class="LineNr"> 89 </span><span class="Delimiter">}</span> +<span id="L90" class="LineNr"> 90 </span><span class="Delimiter">}</span> +<span id="L91" class="LineNr"> 91 </span> +<span id="L92" class="LineNr"> 92 </span><span class="Comment"># single-byte code point have identical graphemes</span> +<span id="L93" class="LineNr"> 93 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403code-point.mu.html#L93'>test-to-grapheme-single-byte</a></span> <span class="Delimiter">{</span> +<span id="L94" class="LineNr"> 94 </span> <span class="PreProc">var</span> in-int/<span class="Constant">ecx</span>: int <span class="SpecialChar"><-</span> copy <span class="Constant">0</span> +<span id="L95" class="LineNr"> 95 </span> <span class="Delimiter">{</span> +<span id="L96" class="LineNr"> 96 </span> compare in-int, <span class="Constant">0x7f</span> +<span id="L97" class="LineNr"> 97 </span> <span class="PreProc">break-if-></span> +<span id="L98" class="LineNr"> 98 </span> <span class="PreProc">var</span> in/<span class="Constant">eax</span>: code-point <span class="SpecialChar"><-</span> copy in-int +<span id="L99" class="LineNr"> 99 </span> <span class="PreProc">var</span> out/<span class="Constant">eax</span>: grapheme <span class="SpecialChar"><-</span> <a href='403code-point.mu.html#L20'>to-grapheme</a> in +<span id="L100" class="LineNr">100 </span> <span class="PreProc">var</span> out-int/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> copy out +<span id="L101" class="LineNr">101 </span> <a href='102test.subx.html#L23'>check-ints-equal</a> out-int, in-int, <span class="Constant">"F - test-to-grapheme-single-byte"</span> +<span id="L102" class="LineNr">102 </span> in-int <span class="SpecialChar"><-</span> increment +<span id="L103" class="LineNr">103 </span> <span class="PreProc">loop</span> +<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 id="L107" class="LineNr">107 </span> <span class="Comment"># byte | byte | byte | byte</span> +<span id="L108" class="LineNr">108 </span><span class="Comment"># smallest 2-byte utf-8</span> +<span id="L109" class="LineNr">109 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403code-point.mu.html#L109'>test-to-grapheme-two-bytes-min</a></span> <span class="Delimiter">{</span> +<span id="L110" class="LineNr">110 </span> <span class="PreProc">var</span> in/<span class="Constant">eax</span>: code-point <span class="SpecialChar"><-</span> copy <span class="Constant">0x80</span> <span class="Comment"># 10 00-0000</span> +<span id="L111" class="LineNr">111 </span> <span class="PreProc">var</span> out/<span class="Constant">eax</span>: grapheme <span class="SpecialChar"><-</span> <a href='403code-point.mu.html#L20'>to-grapheme</a> in +<span id="L112" class="LineNr">112 </span> <span class="PreProc">var</span> out-int/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> copy out +<span id="L113" class="LineNr">113 </span> <a href='102test.subx.html#L23'>check-ints-equal</a> out-int, <span class="Constant">0x80c2</span>, <span class="Constant">"F - <a href='403code-point.mu.html#L20'>to-grapheme</a>/2a"</span> <span class="Comment"># 110 0-0010 10 00-0000</span> +<span id="L114" class="LineNr">114 </span><span class="Delimiter">}</span> +<span id="L115" class="LineNr">115 </span> +<span id="L116" class="LineNr">116 </span><span class="Comment"># largest 2-byte utf-8</span> +<span id="L117" class="LineNr">117 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403code-point.mu.html#L117'>test-to-grapheme-two-bytes-max</a></span> <span class="Delimiter">{</span> +<span id="L118" class="LineNr">118 </span> <span class="PreProc">var</span> in/<span class="Constant">eax</span>: code-point <span class="SpecialChar"><-</span> copy <span class="Constant">0x7ff</span> <span class="Comment"># 1-1111 11-1111</span> +<span id="L119" class="LineNr">119 </span> <span class="PreProc">var</span> out/<span class="Constant">eax</span>: grapheme <span class="SpecialChar"><-</span> <a href='403code-point.mu.html#L20'>to-grapheme</a> in +<span id="L120" class="LineNr">120 </span> <span class="PreProc">var</span> out-int/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> copy out +<span id="L121" class="LineNr">121 </span> <a href='102test.subx.html#L23'>check-ints-equal</a> out-int, <span class="Constant">0xbfdf</span>, <span class="Constant">"F - <a href='403code-point.mu.html#L20'>to-grapheme</a>/2b"</span> <span class="Comment"># 110 1-1111 10 11-1111</span> +<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="Comment"># smallest 3-byte utf-8</span> +<span id="L125" class="LineNr">125 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403code-point.mu.html#L125'>test-to-grapheme-three-bytes-min</a></span> <span class="Delimiter">{</span> +<span id="L126" class="LineNr">126 </span> <span class="PreProc">var</span> in/<span class="Constant">eax</span>: code-point <span class="SpecialChar"><-</span> copy <span class="Constant">0x800</span> <span class="Comment"># 10-0000 00-0000</span> +<span id="L127" class="LineNr">127 </span> <span class="PreProc">var</span> out/<span class="Constant">eax</span>: grapheme <span class="SpecialChar"><-</span> <a href='403code-point.mu.html#L20'>to-grapheme</a> in +<span id="L128" class="LineNr">128 </span> <span class="PreProc">var</span> out-int/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> copy out +<span id="L129" class="LineNr">129 </span> <a href='102test.subx.html#L23'>check-ints-equal</a> out-int, <span class="Constant">0x80a0e0</span>, <span class="Constant">"F - <a href='403code-point.mu.html#L20'>to-grapheme</a>/3a"</span> <span class="Comment"># 1110 0000 10 10-0000 10 00-0000</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="Comment"># largest 3-byte utf-8</span> +<span id="L133" class="LineNr">133 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403code-point.mu.html#L133'>test-to-grapheme-three-bytes-max</a></span> <span class="Delimiter">{</span> +<span id="L134" class="LineNr">134 </span> <span class="PreProc">var</span> in/<span class="Constant">eax</span>: code-point <span class="SpecialChar"><-</span> copy <span class="Constant">0xffff</span> <span class="Comment"># 1111 11-1111 11-1111</span> +<span id="L135" class="LineNr">135 </span> <span class="PreProc">var</span> out/<span class="Constant">eax</span>: grapheme <span class="SpecialChar"><-</span> <a href='403code-point.mu.html#L20'>to-grapheme</a> in +<span id="L136" class="LineNr">136 </span> <span class="PreProc">var</span> out-int/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> copy out +<span id="L137" class="LineNr">137 </span> <a href='102test.subx.html#L23'>check-ints-equal</a> out-int, <span class="Constant">0xbfbfef</span>, <span class="Constant">"F - <a href='403code-point.mu.html#L20'>to-grapheme</a>/3b"</span> <span class="Comment"># 1110 1111 10 11-1111 10 11-1111</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="Comment"># smallest 4-byte utf-8</span> +<span id="L141" class="LineNr">141 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403code-point.mu.html#L141'>test-to-grapheme-four-bytes-min</a></span> <span class="Delimiter">{</span> +<span id="L142" class="LineNr">142 </span> <span class="PreProc">var</span> in/<span class="Constant">eax</span>: code-point <span class="SpecialChar"><-</span> copy <span class="Constant">0x10000</span> <span class="Comment"># 1-0000 00-0000 00-0000</span> +<span id="L143" class="LineNr">143 </span> <span class="PreProc">var</span> out/<span class="Constant">eax</span>: grapheme <span class="SpecialChar"><-</span> <a href='403code-point.mu.html#L20'>to-grapheme</a> in +<span id="L144" class="LineNr">144 </span> <span class="PreProc">var</span> out-int/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> copy out +<span id="L145" class="LineNr">145 </span> <a href='102test.subx.html#L23'>check-ints-equal</a> out-int, <span class="Constant">0x808090f0</span>, <span class="Constant">"F - <a href='403code-point.mu.html#L20'>to-grapheme</a>/4a"</span> <span class="Comment"># 1111-0 000 10 01-0000 10 00-0000 10 00-0000</span> +<span id="L146" class="LineNr">146 </span><span class="Delimiter">}</span> +<span id="L147" class="LineNr">147 </span> +<span id="L148" class="LineNr">148 </span><span class="Comment"># largest 4-byte utf-8</span> +<span id="L149" class="LineNr">149 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403code-point.mu.html#L149'>test-to-grapheme-four-bytes-max</a></span> <span class="Delimiter">{</span> +<span id="L150" class="LineNr">150 </span> <span class="PreProc">var</span> in/<span class="Constant">eax</span>: code-point <span class="SpecialChar"><-</span> copy <span class="Constant">0x1fffff</span> <span class="Comment"># 111 11-1111 11-1111 11-1111</span> +<span id="L151" class="LineNr">151 </span> <span class="PreProc">var</span> out/<span class="Constant">eax</span>: grapheme <span class="SpecialChar"><-</span> <a href='403code-point.mu.html#L20'>to-grapheme</a> in +<span id="L152" class="LineNr">152 </span> <span class="PreProc">var</span> out-int/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> copy out +<span id="L153" class="LineNr">153 </span> <a href='102test.subx.html#L23'>check-ints-equal</a> out-int, <span class="Constant">0xbfbfbff7</span>, <span class="Constant">"F - <a href='403code-point.mu.html#L20'>to-grapheme</a>/4b"</span> <span class="Comment"># 1111-0 111 10 11-1111 10 11-1111 10 11-1111</span> +<span id="L154" class="LineNr">154 </span><span class="Delimiter">}</span> +<span id="L155" class="LineNr">155 </span> +<span id="L156" class="LineNr">156 </span><span class="Comment"># To run all tests, uncomment this and run:</span> +<span id="L157" class="LineNr">157 </span><span class="Comment"># $ ./translate_mu '' && ./a.elf</span> +<span id="L158" class="LineNr">158 </span><span class="CommentedCode">#? fn main -> r/ebx: int {</span> +<span id="L159" class="LineNr">159 </span><span class="CommentedCode">#? run-tests</span> +<span id="L160" class="LineNr">160 </span><span class="CommentedCode">#? r <- copy 0</span> +<span id="L161" class="LineNr">161 </span><span class="CommentedCode">#? }</span> +</pre> +</body> +</html> +<!-- vim: set foldmethod=manual : --> |