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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:&: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>
<span class="Constant">1</span>:num/<span class="Special">raw <- </span>index tab, <span class="Constant">12</span>
]
memory-should-contain [
<span class="Constant">1</span><span class="Special"> <- </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"> <- </span>new <span class="Constant">[abc def]</span>
<span class="Delimiter">{</span>tab: (address table text number)<span class="Delimiter">}</span><span class="Special"> <- </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 <- </span>index tab, key
]
memory-should-contain [
<span class="Constant">1</span><span class="Special"> <- </span><span class="Constant">34</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): <span class="muData">type</span><span class="Delimiter">}</span>
data:&:@:table_row:_key:_value<span class="Special"> <- </span>new <span class="Delimiter">{</span>(table_row _key _value): <span class="muData">type</span><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<span class="Special"> <- </span>divide-with-remainder hash, capacity
hash<span class="Special"> <- </span>abs hash <span class="Comment"># in case hash overflows into a negative integer</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
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, new-row
]
<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>
]
<span class="muRecipe">def</span> index table:&:table:_key:_value, key:_key<span class="muRecipe"> -> </span>result:_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<span class="Special"> <- </span>divide-with-remainder hash, capacity
hash<span class="Special"> <- </span>abs hash <span class="Comment"># in case hash overflows into a negative integer</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
occupied?:bool<span class="Special"> <- </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"> <- </span>get x, <span class="Constant">value:offset</span>
]
</pre>
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