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	Commit message (Expand)	Author	Age	Files	Lines
*	improve code in categories.nim; add std/private/gitutils; fix flakyness in ni...	Timothee Cour	2021-01-29	1	-0/+40
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<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="Comment"># incomplete; doesn't handle hash conflicts</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>
    60:num/<span class="Special">raw</span>, 61:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> index tab,<span class="Constant"> 12</span>
  ]
  memory-should-contain [
   <span class="Constant"> 60</span> <span class="Special">&lt;-</span><span class="Constant"> 34</span>
   <span class="Constant"> 61</span> <span class="Special">&lt;-</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:&amp;:table:text:num <span class="Special">&lt;-</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">&lt;-</span> index tab, <span class="Constant">[abc def]</span>
  ]
  memory-should-contain [
   <span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 34</span>
   <span class="Constant"> 2</span> <span class="Special">&lt;-</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:&amp;:table:text:num <span class="Special">&lt;-</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">&lt;-</span> index tab, <span class="Constant">[abc def]</span>
  ]
  memory-should-contain [
   <span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
   <span class="Constant"> 2</span> <span class="Special">&lt;-</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:&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="Comment"># todo: tag results as /required so that call-sites are forbidden from ignoring them</span>
<span class="Comment"># then we could handle conflicts simply by resizing the table</span>
<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-key:num <span class="Special">&lt;-</span> divide-with-remainder hash, capacity
  hash-key <span class="Special">&lt;-</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:&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-key
  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-key, new-row
]

<span class="muRecipe">def</span> index table:&amp;:table:_key:_value, key:_key<span class="muRecipe"> -&gt; </span>result:_value, found?:bool [
  <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-key:num <span class="Special">&lt;-</span> divide-with-remainder hash, capacity
  hash-key <span class="Special">&lt;-</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:&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-key
  empty:&amp;:_value <span class="Special">&lt;-</span> new <span class="Constant">_value:type</span>
  result <span class="Special">&lt;-</span> copy *empty
  found?:bool <span class="Special">&lt;-</span> get x, <span class="Constant">occupied?:offset</span>
  <span class="muControl">return-unless</span> found?
  key2:_key <span class="Special">&lt;-</span> get x, <span class="Constant">key:offset</span>
  found?:bool <span class="Special">&lt;-</span> equal key, key2
  <span class="muControl">return-unless</span> found?
  result <span class="Special">&lt;-</span> get x, <span class="Constant">value:offset</span>
]

<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>
]
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