1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
<!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 - continuation4.mu</title>
<meta name="Generator" content="Vim/8.0">
<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; }
body { font-size:12pt; font-family: monospace; color: #aaaaaa; background-color: #080808; }
.subxS2Comment a { color:inherit; }
.subxS1Comment a { color:inherit; }
.subxComment a { color:inherit; }
.subxH2Comment a { color:inherit; }
.subxH1Comment a { color:inherit; }
* { font-size:12pt; font-size: 1em; }
.muControl { color:#c0a020; }
.muRecipe { color: #ff8700; }
.LineNr { color:#444444; }
.Delimiter { color:#800080; }
.Constant { color:#00a0a0; }
.Special { color:#c00000; }
.Comment { color: #8080ff; }
-->
</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;
}
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/continuation4.mu'>https://github.com/akkartik/mu/blob/master/continuation4.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment"># Example program showing 'return-continuation-until-mark' return other values</span>
<span id="L2" class="LineNr"> 2 </span><span class="Comment"># alongside continuations.</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 given list of numbers.</span>
<span id="L5" class="LineNr"> 5 </span><span class="Comment">#</span>
<span id="L6" class="LineNr"> 6 </span><span class="Comment"># To run:</span>
<span id="L7" class="LineNr"> 7 </span><span class="Comment"># $ git clone <a href="https://github.com/akkartik/mu">https://github.com/akkartik/mu</a></span>
<span id="L8" class="LineNr"> 8 </span><span class="Comment"># $ cd mu</span>
<span id="L9" class="LineNr"> 9 </span><span class="Comment"># $ ./mu continuation4.mu</span>
<span id="L10" class="LineNr">10 </span><span class="Comment">#</span>
<span id="L11" class="LineNr">11 </span><span class="Comment"># Expected output:</span>
<span id="L12" class="LineNr">12 </span><span class="Comment"># 1</span>
<span id="L13" class="LineNr">13 </span><span class="Comment"># 2</span>
<span id="L14" class="LineNr">14 </span><span class="Comment"># 3</span>
<span id="L15" class="LineNr">15 </span>
<span id="L16" class="LineNr">16 </span><span class="muRecipe">def</span> <a href='continuation4.mu.html#L16'>main</a> [
<span id="L17" class="LineNr">17 </span> <span class="Constant">local-scope</span>
<span id="L18" class="LineNr">18 </span> l:&:<a href='064list.mu.html#L6'>list</a>:num <span class="Special"><-</span> copy<span class="Constant"> null</span>
<span id="L19" class="LineNr">19 </span> l <span class="Special"><-</span> push<span class="Constant"> 3</span>, l
<span id="L20" class="LineNr">20 </span> l <span class="Special"><-</span> push<span class="Constant"> 2</span>, l
<span id="L21" class="LineNr">21 </span> l <span class="Special"><-</span> push<span class="Constant"> 1</span>, l
<span id="L22" class="LineNr">22 </span> k:continuation, x:num, done?:bool <span class="Special"><-</span> <span class="muControl">call-with-continuation-mark</span> <span class="Constant">100/mark</span>, <a href='continuation4.mu.html#L31'>create-yielder</a>, l
<span id="L23" class="LineNr">23 </span> <span class="Delimiter">{</span>
<span id="L24" class="LineNr">24 </span> <span class="muControl">break-if</span> done?
<span id="L25" class="LineNr">25 </span> $print x <span class="Constant">10/newline</span>
<span id="L26" class="LineNr">26 </span> k, x:num, done?:bool <span class="Special"><-</span> call k
<span id="L27" class="LineNr">27 </span> <span class="muControl"> loop</span>
<span id="L28" class="LineNr">28 </span> <span class="Delimiter">}</span>
<span id="L29" class="LineNr">29 </span>]
<span id="L30" class="LineNr">30 </span>
<span id="L31" class="LineNr">31 </span><span class="muRecipe">def</span> <a href='continuation4.mu.html#L31'>create-yielder</a> l:&:<a href='064list.mu.html#L6'>list</a>:num<span class="muRecipe"> -> </span>n:num, done?:bool [
<span id="L32" class="LineNr">32 </span> <span class="Constant">local-scope</span>
<span id="L33" class="LineNr">33 </span> <span class="Constant">load-inputs</span>
<span id="L34" class="LineNr">34 </span> <span class="Delimiter">{</span>
<span id="L35" class="LineNr">35 </span> done? <span class="Special"><-</span> equal l,<span class="Constant"> null</span>
<span id="L36" class="LineNr">36 </span> <span class="muControl">break-if</span> done?
<span id="L37" class="LineNr">37 </span> n <span class="Special"><-</span> first l
<span id="L38" class="LineNr">38 </span> l <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> l
<span id="L39" class="LineNr">39 </span> <span class="muControl">return-continuation-until-mark</span> <span class="Constant">100/mark</span>, n, done?
<span id="L40" class="LineNr">40 </span> <span class="muControl"> loop</span>
<span id="L41" class="LineNr">41 </span> <span class="Delimiter">}</span>
<span id="L42" class="LineNr">42 </span> <span class="Comment"># A function that returns continuations shouldn't get the opportunity to</span>
<span id="L43" class="LineNr">43 </span> <span class="Comment"># return. Calling functions should stop calling its continuation after this</span>
<span id="L44" class="LineNr">44 </span> <span class="Comment"># point.</span>
<span id="L45" class="LineNr">45 </span> <span class="muControl">return-continuation-until-mark</span> <span class="Constant">100/mark</span>,<span class="Constant"> -1</span>, done?
<span id="L46" class="LineNr">46 </span> assert<span class="Constant"> false</span>, <span class="Constant">[called too many times, ran out of continuations to return]</span>
<span id="L47" class="LineNr">47 </span>]
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->
|