html/075scenario_keyboard.cc.html


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<pre id='vimCodeElement'>
<span class="Comment">//: Clean syntax to manipulate and check the keyboard in scenarios.</span>
<span class="Comment">//: Instruction 'assume-keyboard' implicitly creates a variable called</span>
<span class="Comment">//: 'keyboard' that is accessible inside other 'run' instructions in the</span>
<span class="Comment">//: scenario.</span>

<span class="Delimiter">:(scenarios run_mu_scenario)</span>
<span class="Delimiter">:(scenario keyboard_in_scenario)</span>
scenario keyboard-in-scenario [
  assume-keyboard [abc]
  run [
    <span class="Constant">1</span>:character<span class="Delimiter">,</span> <span class="Constant">2</span>:boolean<span class="Delimiter">,</span> keyboard:address<span class="Special"> &lt;- </span>read-key keyboard:address
    <span class="Constant">3</span>:character<span class="Delimiter">,</span> <span class="Constant">4</span>:boolean<span class="Delimiter">,</span> keyboard:address<span class="Special"> &lt;- </span>read-key keyboard:address
    <span class="Constant">5</span>:character<span class="Delimiter">,</span> <span class="Constant">6</span>:boolean<span class="Delimiter">,</span> keyboard:address<span class="Special"> &lt;- </span>read-key keyboard:address
    <span class="Constant">7</span>:character<span class="Delimiter">,</span> <span class="Constant">8</span>:boolean<span class="Delimiter">,</span> keyboard:address<span class="Special"> &lt;- </span>read-key keyboard:address
  ]
  memory-should-contain [
    <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">97</span>  <span class="Comment"># 'a'</span>
    <span class="Constant">2</span><span class="Special"> &lt;- </span><span class="Constant">1</span>  <span class="Comment"># first read-key call found a character</span>
    <span class="Constant">3</span><span class="Special"> &lt;- </span><span class="Constant">98</span>  <span class="Comment"># 'b'</span>
    <span class="Constant">4</span><span class="Special"> &lt;- </span><span class="Constant">1</span>  <span class="Comment"># second read-key call found a character</span>
    <span class="Constant">5</span><span class="Special"> &lt;- </span><span class="Constant">99</span>  <span class="Comment"># 'c'</span>
    <span class="Constant">6</span><span class="Special"> &lt;- </span><span class="Constant">1</span>  <span class="Comment"># third read-key call found a character</span>
    <span class="Constant">7</span><span class="Special"> &lt;- </span><span class="Constant">0</span>
    <span class="Constant">8</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># fourth read-key call didn't find a character</span>
  ]
]

<span class="Delimiter">:(before &quot;End Scenario Globals&quot;)</span>
const size_t KEYBOARD = Next_predefined_global_for_scenarios++<span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End Predefined Scenario Locals In Run&quot;)</span>
Name[tmp_recipe[<span class="Constant">0</span>]][<span class="Constant">&quot;keyboard&quot;</span>] = KEYBOARD<span class="Delimiter">;</span>

<span class="Delimiter">:(before &quot;End Rewrite Instruction(curr)&quot;)</span>
<span class="Comment">// rewrite `assume-keyboard string` to</span>
<span class="Comment">//   ```</span>
<span class="Comment">//   keyboard:address &lt;- new string  # hacky reuse of location</span>
<span class="Comment">//   keyboard:address &lt;- init-fake-keyboard keyboard:address</span>
<span class="Comment">//   ```</span>
if <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>name == <span class="Constant">&quot;assume-keyboard&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Comment">// insert first instruction</span>
  curr<span class="Delimiter">.</span>operation = Recipe_number[<span class="Constant">&quot;new&quot;</span>]<span class="Delimiter">;</span>
  assert<span class="Delimiter">(</span>curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
  curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span><span class="Constant">&quot;keyboard:address&quot;</span><span class="Delimiter">));</span>
  curr<span class="Delimiter">.</span>products[<span class="Constant">0</span>]<span class="Delimiter">.</span>set_value<span class="Delimiter">(</span>KEYBOARD<span class="Delimiter">);</span>
  result<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>curr<span class="Delimiter">);</span>  <span class="Comment">// hacky that &quot;Rewrite Instruction&quot; is converting to multiple instructions</span>
  <span class="Comment">// leave second instruction in curr</span>
  curr<span class="Delimiter">.</span>clear<span class="Delimiter">();</span>
  curr<span class="Delimiter">.</span>operation = Recipe_number[<span class="Constant">&quot;init-fake-keyboard&quot;</span>]<span class="Delimiter">;</span>
  assert<span class="Delimiter">(</span>curr<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
  curr<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span><span class="Constant">&quot;keyboard:address&quot;</span><span class="Delimiter">));</span>
  curr<span class="Delimiter">.</span>ingredients[<span class="Constant">0</span>]<span class="Delimiter">.</span>set_value<span class="Delimiter">(</span>KEYBOARD<span class="Delimiter">);</span>
  assert<span class="Delimiter">(</span>curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
  curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span><span class="Constant">&quot;keyboard:address&quot;</span><span class="Delimiter">));</span>
  curr<span class="Delimiter">.</span>products[<span class="Constant">0</span>]<span class="Delimiter">.</span>set_value<span class="Delimiter">(</span>KEYBOARD<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
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