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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<title>Mu - 070table.mu</title>
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<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 [
  <span class="Constant">local-scope</span>
  tab:&amp;:table:num:num<span class="Special"> &lt;- </span>new-table <span class="Constant">30</span>
  run [
    put-index tab, <span class="Constant">12</span>, <span class="Constant">34</span>
    <span class="Constant">1</span>:num/<span class="Special">raw &lt;- </span>index tab, <span class="Constant">12</span>
  ]
  memory-should-contain [
    <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">34</span>
  ]
]

<span class="muScenario">scenario</span> table-read-write-non-integer [
  <span class="Constant">local-scope</span>
  key:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc def]</span>
  <span class="Delimiter">{</span>tab: (address table text number)<span class="Delimiter">}</span><span class="Special"> &lt;- </span>new-table <span class="Constant">30</span>
  run [
    put-index tab, key, <span class="Constant">34</span>
    <span class="Constant">1</span>:num/<span class="Special">raw &lt;- </span>index tab, key
  ]
  memory-should-contain [
    <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">34</span>
  ]
]

<span class="muData">container</span> table:_key:_value [
  length:num
  capacity:num
  data:&amp;:@: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"> -&gt; </span>result:&amp;: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:&amp;:@: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-index table:&amp;:table:_key:_value, key:_key, value:_value<span class="muRecipe"> -&gt; </span>table:&amp;:table:_key:_value [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  hash:num<span class="Special"> &lt;- </span>hash key
  hash<span class="Special"> &lt;- </span>abs hash
  capacity:num<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:&amp;:@: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?:bool<span class="Special"> &lt;- </span>get x, <span class="Constant">occupied?:offset</span>
  not-occupied?:bool<span class="Special"> &lt;- </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"> &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:num<span class="muRecipe"> -&gt; </span>result:num [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  positive?:bool<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:&amp;: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:num<span class="Special"> &lt;- </span>hash key
  hash<span class="Special"> &lt;- </span>abs hash
  capacity:num<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:&amp;:@: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?:bool<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>
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