<!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 - 070table.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; }
.muData { color: #ffff00; }
.muControl { color: #c0a020; }
.Delimiter { color: #800080; }
.Comment { color: #9090ff; }
.Constant { color: #00a0a0; }
.Special { color: #c00000; }
.muRecipe { color: #ff8700; }
.muScenario { color: #00af00; }
-->
</style>
<script type='text/javascript'>
<!--
-->
</script>
</head>
<body>
<pre id='vimCodeElement'>
<span class="Comment"># A table is like an array, except that you can index it with arbitrary types</span>
<span class="Comment"># and not just non-negative whole numbers.</span>
<span class="muScenario">scenario</span> table-read-write [
<span class="Constant">local-scope</span>
tab:&:table:num:num <span class="Special"><-</span> new-table<span class="Constant"> 30</span>
run [
put-index tab,<span class="Constant"> 12</span>,<span class="Constant"> 34</span>
60:num/<span class="Special">raw</span>, 61:bool/<span class="Special">raw</span> <span class="Special"><-</span> index tab,<span class="Constant"> 12</span>
]
memory-should-contain [
<span class="Constant"> 60</span> <span class="Special"><-</span><span class="Constant"> 34</span>
<span class="Constant"> 61</span> <span class="Special"><-</span><span class="Constant"> 1</span> <span class="Comment"># found</span>
]
]
<span class="muScenario">scenario</span> table-read-write-non-integer [
<span class="Constant">local-scope</span>
tab:&:table:text:num <span class="Special"><-</span> new-table<span class="Constant"> 30</span>
run [
put-index tab, <span class="Constant">[abc def]</span>,<span class="Constant"> 34</span>
1:num/<span class="Special">raw</span>, 2:bool/<span class="Special">raw</span> <span class="Special"><-</span> index tab, <span class="Constant">[abc def]</span>
]
memory-should-contain [
<span class="Constant"> 1</span> <span class="Special"><-</span><span class="Constant"> 34</span>
<span class="Constant"> 2</span> <span class="Special"><-</span><span class="Constant"> 1</span> <span class="Comment"># found</span>
]
]
<span class="muScenario">scenario</span> table-read-not-found [
<span class="Constant">local-scope</span>
tab:&:table:text:num <span class="Special"><-</span> new-table<span class="Constant"> 30</span>
run [
1:num/<span class="Special">raw</span>, 2:bool/<span class="Special">raw</span> <span class="Special"><-</span> index tab, <span class="Constant">[abc def]</span>
]
memory-should-contain [
<span class="Constant"> 1</span> <span class="Special"><-</span><span class="Constant"> 0</span>
<span class="Constant"> 2</span> <span class="Special"><-</span><span class="Constant"> 0</span> <span class="Comment"># not found</span>
]
]
<span class="muData">container</span> table:_key:_value [
length:num
capacity:num
data:&:@:table-row:_key:_value
]
<span class="muData">container</span> table-row:_key:_value [
occupied?:bool
key:_key
value:_value
]
<span class="muRecipe">def</span> new-table capacity:num<span class="muRecipe"> -> </span>result:&:table:_key:_value [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
result <span class="Special"><-</span> new <span class="Delimiter">{</span>(table _key _value): type<span class="Delimiter">}</span>
data:&:@:table-row:_key:_value <span class="Special"><-</span> new <span class="Delimiter">{</span>(table-row _key _value): type<span class="Delimiter">}</span>, capacity
*result <span class="Special"><-</span> merge <span class="Constant">0/length</span>, capacity, data
]
<span class="muRecipe">def</span> put-index table:&:table:_key:_value, key:_key, value:_value<span class="muRecipe"> -> </span>table:&:table:_key:_value [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
hash:num <span class="Special"><-</span> hash key
hash <span class="Special"><-</span> abs hash
capacity:num <span class="Special"><-</span> get *table, <span class="Constant">capacity:offset</span>
_, hash-key:num <span class="Special"><-</span> divide-with-remainder hash, capacity
hash-key <span class="Special"><-</span> abs hash-key <span class="Comment"># in case hash overflows from a double into a negative integer inside 'divide-with-remainder' above</span>
table-data:&:@:table-row:_key:_value <span class="Special"><-</span> get *table, <span class="Constant">data:offset</span>
x:table-row:_key:_value <span class="Special"><-</span> index *table-data, hash-key
occupied?:bool <span class="Special"><-</span> get x, <span class="Constant">occupied?:offset</span>
not-occupied?:bool <span class="Special"><-</span> not occupied?:bool
assert not-occupied?, <span class="Constant">[can't handle collisions yet]</span>
new-row:table-row:_key:_value <span class="Special"><-</span> merge <span class="Constant">1/true</span>, key, value
*table-data <span class="Special"><-</span> put-index *table-data, hash-key, new-row
]
<span class="muRecipe">def</span> index table:&:table:_key:_value, key:_key<span class="muRecipe"> -> </span>result:_value, found?:bool [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
hash:num <span class="Special"><-</span> hash key
hash <span class="Special"><-</span> abs hash
capacity:num <span class="Special"><-</span> get *table, <span class="Constant">capacity:offset</span>
_, hash-key:num <span class="Special"><-</span> divide-with-remainder hash, capacity
hash-key <span class="Special"><-</span> abs hash-key <span class="Comment"># in case hash overflows from a double into a negative integer inside 'divide-with-remainder' above</span>
table-data:&:@:table-row:_key:_value <span class="Special"><-</span> get *table, <span class="Constant">data:offset</span>
x:table-row:_key:_value <span class="Special"><-</span> index *table-data, hash-key
empty:&:_value <span class="Special"><-</span> new <span class="Constant">_value:type</span>
result <span class="Special"><-</span> copy *empty
found?:bool <span class="Special"><-</span> get x, <span class="Constant">occupied?:offset</span>
<span class="muControl">return-unless</span> found?
key2:_key <span class="Special"><-</span> get x, <span class="Constant">key:offset</span>
found?:bool <span class="Special"><-</span> equal key, key2
<span class="muControl">return-unless</span> found?
result <span class="Special"><-</span> get x, <span class="Constant">value:offset</span>
]
<span class="muRecipe">def</span> abs n:num<span class="muRecipe"> -> </span>result:num [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
positive?:bool <span class="Special"><-</span> greater-or-equal n,<span class="Constant"> 0</span>
<span class="muControl">return-if</span> positive?, n
result <span class="Special"><-</span> multiply n,<span class="Constant"> -1</span>
]
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->