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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 [
run [
<span class="Constant">1</span>:address:table:number:number<span class="Special"> <- </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"> <- </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"> <- </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"> <- </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"> <- </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"> <- </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"> <- </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"> -> </span>result:address: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:address:array: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 table:address:table:_key:_value, key:_key, value:_value<span class="muRecipe"> -> </span>table:address:table:_key:_value [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
hash:number<span class="Special"> <- </span>hash key
hash<span class="Special"> <- </span>abs hash
capacity:number<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:address:array: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?:boolean<span class="Special"> <- </span>get x, <span class="Constant">occupied?:offset</span>
not-occupied?:boolean<span class="Special"> <- </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"> <- </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:number<span class="muRecipe"> -> </span>result:number [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
positive?:boolean<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:address:table:_key:_value, key:_key<span class="muRecipe"> -> </span>result:_value [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
hash:number<span class="Special"> <- </span>hash key
hash<span class="Special"> <- </span>abs hash
capacity:number<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:address:array: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?:boolean<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>
]
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