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authorKartik K. Agaram <vc@akkartik.com>2017-11-06 01:28:53 -0800
committerKartik K. Agaram <vc@akkartik.com>2017-11-06 01:28:53 -0800
commitd55e77387fd9cc3eae2f17a6c1993f3bcb061a60 (patch)
treeff395f7d64f196c68560654b027fb1e59bf8bccc /html/continuation5.mu.html
parent3b776ac3843e925ee24f49e8df51ab6a1db6c085 (diff)
downloadmu-d55e77387fd9cc3eae2f17a6c1993f3bcb061a60.tar.gz
4117 - done with delimited continuations
At least this particular implementation of them. Let's play with them
now for a while, see if they're fully equivalent to shift/reduce.
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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 - continuation5.mu</title>
+<meta name="Generator" content="Vim/7.4">
+<meta name="plugin-version" content="vim7.4_v2">
+<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">
+<style type="text/css">
+<!--
+pre { white-space: pre-wrap; font-family: monospace; color: #aaaaaa; background-color: #080808; }
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+a { color:#eeeeee; text-decoration: none; }
+a:hover { text-decoration: underline; }
+* { font-size: 12pt; font-size: 1em; }
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+.muControl { color: #c0a020; }
+-->
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+
+<script type='text/javascript'>
+<!--
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+/* function to open any folds containing a jumped-to line before jumping to it */
+function JumpToLine()
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+  var lineNum;
+  lineNum = window.location.hash;
+  lineNum = lineNum.substr(1); /* strip off '#' */
+
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+    lineNum = 'L'+lineNum;
+  }
+  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.
+   */
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+  }
+  return true;
+}
+if ('onhashchange' in window) {
+  window.onhashchange = JumpToLine;
+}
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+</script>
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+<body onload='JumpToLine();'>
+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="Comment"># Example program showing that a 'paused' continuation can be 'resumed' with</span>
+<span id="L2" class="LineNr"> 2 </span><span class="Comment"># ingredients.</span>
+<span id="L3" class="LineNr"> 3 </span><span class="Comment">#</span>
+<span id="L4" class="LineNr"> 4 </span><span class="Comment"># Print out a list of numbers, first adding 0 to the first, 1 to the second, 2</span>
+<span id="L5" class="LineNr"> 5 </span><span class="Comment"># to the third, and so on.</span>
+<span id="L6" class="LineNr"> 6 </span><span class="Comment">#</span>
+<span id="L7" class="LineNr"> 7 </span><span class="Comment"># Expected output:</span>
+<span id="L8" class="LineNr"> 8 </span><span class="Comment">#   1</span>
+<span id="L9" class="LineNr"> 9 </span><span class="Comment">#   3</span>
+<span id="L10" class="LineNr">10 </span><span class="Comment">#   5</span>
+<span id="L11" class="LineNr">11 </span>
+<span id="L12" class="LineNr">12 </span><span class="muRecipe">def</span> <a href='continuation5.mu.html#L12'>main</a> [
+<span id="L13" class="LineNr">13 </span>  <span class="Constant">local-scope</span>
+<span id="L14" class="LineNr">14 </span>  l:&amp;:<a href='064list.mu.html#L6'>list</a>:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
+<span id="L15" class="LineNr">15 </span>  l <span class="Special">&lt;-</span> push<span class="Constant"> 3</span>, l
+<span id="L16" class="LineNr">16 </span>  l <span class="Special">&lt;-</span> push<span class="Constant"> 2</span>, l
+<span id="L17" class="LineNr">17 </span>  l <span class="Special">&lt;-</span> push<span class="Constant"> 1</span>, l
+<span id="L18" class="LineNr">18 </span>  k:continuation, x:num, done?:bool <span class="Special">&lt;-</span> call-with-continuation-mark <a href='continuation5.mu.html#L29'>create-yielder</a>, l
+<span id="L19" class="LineNr">19 </span>  a:num <span class="Special">&lt;-</span> copy<span class="Constant"> 1</span>
+<span id="L20" class="LineNr">20 </span>  <span class="Delimiter">{</span>
+<span id="L21" class="LineNr">21 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L22" class="LineNr">22 </span>  <span class="Conceal">¦</span> $print x <span class="Constant">10/newline</span>
+<span id="L23" class="LineNr">23 </span>  <span class="Conceal">¦</span> k, x:num, done?:bool <span class="Special">&lt;-</span> call k, a  <span class="Comment"># resume; x = a + next l value</span>
+<span id="L24" class="LineNr">24 </span>  <span class="Conceal">¦</span> a <span class="Special">&lt;-</span> add a,<span class="Constant"> 1</span>
+<span id="L25" class="LineNr">25 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
+<span id="L26" class="LineNr">26 </span>  <span class="Delimiter">}</span>
+<span id="L27" class="LineNr">27 </span>]
+<span id="L28" class="LineNr">28 </span>
+<span id="L29" class="LineNr">29 </span><span class="muRecipe">def</span> <a href='continuation5.mu.html#L29'>create-yielder</a> l:&amp;:<a href='064list.mu.html#L6'>list</a>:num<span class="muRecipe"> -&gt; </span>n:num, done?:bool [
+<span id="L30" class="LineNr">30 </span>  <span class="Constant">local-scope</span>
+<span id="L31" class="LineNr">31 </span>  <span class="Constant">load-ingredients</span>
+<span id="L32" class="LineNr">32 </span>  a:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
+<span id="L33" class="LineNr">33 </span>  <span class="Delimiter">{</span>
+<span id="L34" class="LineNr">34 </span>  <span class="Conceal">¦</span> done? <span class="Special">&lt;-</span> equal l,<span class="Constant"> 0</span>
+<span id="L35" class="LineNr">35 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L36" class="LineNr">36 </span>  <span class="Conceal">¦</span> n <span class="Special">&lt;-</span> first l
+<span id="L37" class="LineNr">37 </span>  <span class="Conceal">¦</span> l <span class="Special">&lt;-</span> <a href='064list.mu.html#L24'>rest</a> l
+<span id="L38" class="LineNr">38 </span>  <span class="Conceal">¦</span> n <span class="Special">&lt;-</span> add n, a
+<span id="L39" class="LineNr">39 </span>  <span class="Conceal">¦</span> a <span class="Special">&lt;-</span> return-continuation-until-mark n, done?  <span class="Comment"># pause/resume</span>
+<span id="L40" class="LineNr">40 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
+<span id="L41" class="LineNr">41 </span>  <span class="Delimiter">}</span>
+<span id="L42" class="LineNr">42 </span>  return-continuation-until-mark<span class="Constant"> -1</span>, done?
+<span id="L43" class="LineNr">43 </span>  assert <span class="Constant">0/false</span>, <span class="Constant">[called too many times, ran out of continuations to return]</span>
+<span id="L44" class="LineNr">44 </span>]
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->
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