about summary refs log tree commit diff stats
path: root/html/079table.mu.html
blob: 76d9708247aebb0b3de6b51c5010d58f0b421b22 (plain) (blame)
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
114
115
116
117
118
119
120
121
122
123
<!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 - 079table.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="use_css,pre_wrap,no_foldcolumn,expand_tabs,prevent_copy=">
<meta name="colorscheme" content="minimal">
<style type="text/css">
<!--
pre { white-space: pre-wrap; font-family: monospace; color: #eeeeee; background-color: #080808; }
body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color: #080808; }
* { font-size: 12pt; font-size: 1em; }
.muScenario { color: #00af00; }
.muData { color: #ffff00; }
.Delimiter { color: #800080; }
.muRecipe { color: #ff8700; }
.Comment { color: #9090ff; }
.Constant { color: #00a0a0; }
.Special { color: #c00000; }
.muControl { color: #c0a020; }
-->
</style>

<script type='text/javascript'>
<!--

-->
</script>
</head>
<body>
<pre id='vimCodeElement'>
<span class="Comment"># A table is like an array, except that its keys are not integers but</span>
<span class="Comment"># arbitrary types.</span>

<span class="muScenario">scenario</span> table-read-write [
  run [
    <span class="Constant">1</span>:address:table:number:number<span class="Special"> &lt;- </span>new-table <span class="Constant">30</span>
    put <span class="Constant">1</span>:address:table:number:number, <span class="Constant">12</span>, <span class="Constant">34</span>
    <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>index <span class="Constant">1</span>:address:table:number:number, <span class="Constant">12</span>
  ]
  memory-should-contain [
    <span class="Constant">2</span><span class="Special"> &lt;- </span><span class="Constant">34</span>
  ]
]

<span class="muScenario">scenario</span> table-read-write-non-integer [
  run [
    <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc def]</span>
    <span class="Delimiter">{</span><span class="Constant">2</span>: (address table (address array character) number)<span class="Delimiter">}</span><span class="Special"> &lt;- </span>new-table <span class="Constant">30</span>
    put <span class="Delimiter">{</span><span class="Constant">2</span>: (address table (address array character) number)<span class="Delimiter">}</span>, <span class="Constant">1</span>:address:array:character, <span class="Constant">34</span>
    <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>index <span class="Delimiter">{</span><span class="Constant">2</span>: (address table (address array character) number)<span class="Delimiter">}</span>, <span class="Constant">1</span>:address:array:character
  ]
  memory-should-contain [
    <span class="Constant">3</span><span class="Special"> &lt;- </span><span class="Constant">34</span>
  ]
]

<span class="muData">container</span> table:_key:_value [
  length:number
  capacity:number
  data:address:array:table_row:_key:_value
]

<span class="muData">container</span> table_row:_key:_value [
  occupied?:boolean
  key:_key
  value:_value
]

<span class="muRecipe">def</span> new-table capacity:number<span class="muRecipe"> -&gt; </span>result:address:table:_key:_value [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  result<span class="Special"> &lt;- </span>new <span class="Delimiter">{</span>(table _key _value): type<span class="Delimiter">}</span>
  data:address:array:table_row:_key:_value<span class="Special"> &lt;- </span>new <span class="Delimiter">{</span>(table_row _key _value): type<span class="Delimiter">}</span>, capacity
  *result<span class="Special"> &lt;- </span>merge <span class="Constant">0/length</span>, capacity, data
]

<span class="muRecipe">def</span> put table:address:table:_key:_value, key:_key, value:_value<span class="muRecipe"> -&gt; </span>table:address:table:_key:_value [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  hash:number<span class="Special"> &lt;- </span>hash key
  hash<span class="Special"> &lt;- </span>abs hash
  capacity:number<span class="Special"> &lt;- </span>get *table, <span class="Constant">capacity:offset</span>
  _, hash<span class="Special"> &lt;- </span>divide-with-remainder hash, capacity
  hash<span class="Special"> &lt;- </span>abs hash  <span class="Comment"># in case hash overflows into a negative integer</span>
  table-data:address:array:table_row:_key:_value<span class="Special"> &lt;- </span>get *table, <span class="Constant">data:offset</span>
  x:table_row:_key:_value<span class="Special"> &lt;- </span>index *table-data, hash
  occupied?:boolean<span class="Special"> &lt;- </span>get x, <span class="Constant">occupied?:offset</span>
  not-occupied?:boolean<span class="Special"> &lt;- </span>not occupied?:boolean
  assert not-occupied?, <span class="Constant">[can't handle collisions yet]</span>
  new-row:table_row:_key:_value<span class="Special"> &lt;- </span>merge <span class="Constant">1/true</span>, key, value
  *table-data<span class="Special"> &lt;- </span>put-index *table-data, hash, new-row
]

<span class="muRecipe">def</span> abs n:number<span class="muRecipe"> -&gt; </span>result:number [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  positive?:boolean<span class="Special"> &lt;- </span>greater-or-equal n, <span class="Constant">0</span>
  <span class="muControl">return-if</span> positive?, n
  result<span class="Special"> &lt;- </span>multiply n, <span class="Constant">-1</span>
]

<span class="muRecipe">def</span> index table:address:table:_key:_value, key:_key<span class="muRecipe"> -&gt; </span>result:_value [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  hash:number<span class="Special"> &lt;- </span>hash key
  hash<span class="Special"> &lt;- </span>abs hash
  capacity:number<span class="Special"> &lt;- </span>get *table, <span class="Constant">capacity:offset</span>
  _, hash<span class="Special"> &lt;- </span>divide-with-remainder hash, capacity
  hash<span class="Special"> &lt;- </span>abs hash  <span class="Comment"># in case hash overflows into a negative integer</span>
  table-data:address:array:table_row:_key:_value<span class="Special"> &lt;- </span>get *table, <span class="Constant">data:offset</span>
  x:table_row:_key:_value<span class="Special"> &lt;- </span>index *table-data, hash
  occupied?:boolean<span class="Special"> &lt;- </span>get x, <span class="Constant">occupied?:offset</span>
  assert occupied?, <span class="Constant">[can't handle missing elements yet]</span>
  result<span class="Special"> &lt;- </span>get x, <span class="Constant">value:offset</span>
]
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->