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<pre id='vimCodeElement'>
<span class="muRecipe">def</span> random generator:&:stream:num<span class="muRecipe"> -> </span>result:num, fail?:bool, generator:&:stream:num [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Delimiter">{</span>
<span class="muControl">break-if</span> generator
<span class="Comment"># generator is 0? use real random-number generator</span>
result <span class="Special"><-</span> real-random
<span class="muControl">reply</span> result, <span class="Constant">0/false</span>
<span class="Delimiter">}</span>
result, fail?, generator <span class="Special"><-</span> read generator
]
<span class="Comment"># helper for tests</span>
<span class="muRecipe">def</span> assume-random-numbers<span class="muRecipe"> -> </span>result:&:stream:num [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Comment"># compute result-len, space to allocate in result</span>
result-len:num <span class="Special"><-</span> copy<span class="Constant"> 0</span>
<span class="Delimiter">{</span>
_, arg-received?:bool <span class="Special"><-</span> <span class="Constant">next-ingredient</span>
<span class="muControl">break-unless</span> arg-received?
result-len <span class="Special"><-</span> add result-len,<span class="Constant"> 1</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
<span class="Constant">rewind-ingredients</span>
result-data:&:@:num <span class="Special"><-</span> new <span class="Constant">number:type</span>, result-len
idx:num <span class="Special"><-</span> copy<span class="Constant"> 0</span>
<span class="Delimiter">{</span>
curr:num, arg-received?:bool <span class="Special"><-</span> <span class="Constant">next-ingredient</span>
<span class="muControl">break-unless</span> arg-received?
*result-data <span class="Special"><-</span> put-index *result-data, idx, curr
idx <span class="Special"><-</span> add idx,<span class="Constant"> 1</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
result <span class="Special"><-</span> new-stream result-data
]
<span class="muScenario">scenario</span> random-numbers-in-scenario [
<span class="Constant">local-scope</span>
source:&:stream:num <span class="Special"><-</span> assume-random-numbers<span class="Constant"> 34</span>,<span class="Constant"> 35</span>,<span class="Constant"> 37</span>
1:num/<span class="Special">raw</span>, 2:bool/<span class="Special">raw</span> <span class="Special"><-</span> random source
3:num/<span class="Special">raw</span>, 4:bool/<span class="Special">raw</span> <span class="Special"><-</span> random source
5:num/<span class="Special">raw</span>, 6:bool/<span class="Special">raw</span> <span class="Special"><-</span> random source
7:num/<span class="Special">raw</span>, 8:bool/<span class="Special">raw</span> <span class="Special"><-</span> random source
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"> 0</span> <span class="Comment"># everything went well</span>
<span class="Constant"> 3</span> <span class="Special"><-</span><span class="Constant"> 35</span>
<span class="Constant"> 4</span> <span class="Special"><-</span><span class="Constant"> 0</span> <span class="Comment"># everything went well</span>
<span class="Constant"> 5</span> <span class="Special"><-</span><span class="Constant"> 37</span>
<span class="Constant"> 6</span> <span class="Special"><-</span><span class="Constant"> 0</span> <span class="Comment"># everything went well</span>
<span class="Constant"> 7</span> <span class="Special"><-</span><span class="Constant"> 0</span> <span class="Comment"># empty result</span>
<span class="Constant"> 8</span> <span class="Special"><-</span><span class="Constant"> 1</span> <span class="Comment"># end of stream</span>
]
]
<span class="muRecipe">def</span> random-in-range generator:&:stream:num, start:num, end:num<span class="muRecipe"> -> </span>result:num, fail?:bool, generator:&:stream:num [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
result, fail?, generator <span class="Special"><-</span> random generator
<span class="muControl">return-if</span> fail?
delta:num <span class="Special"><-</span> subtract end, start
_, result <span class="Special"><-</span> divide-with-remainder result, delta
result <span class="Special"><-</span> add result, start
]
<span class="muScenario">scenario</span> random-in-range [
<span class="Constant">local-scope</span>
source:&:stream:num <span class="Special"><-</span> assume-random-numbers<span class="Constant"> 91</span>
1:num/<span class="Special">raw</span> <span class="Special"><-</span> random-in-range source,<span class="Constant"> 40</span>,<span class="Constant"> 50</span>
memory-should-contain [
<span class="Constant"> 1</span> <span class="Special"><-</span><span class="Constant"> 41</span>
]
]
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