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<span class="Comment">//: Calls can take ingredients just like primitives. To access a recipe's</span>
<span class="Comment">//: ingredients, use 'next-ingredient'.</span>

<span class="Delimiter">:(scenario next_ingredient)</span>
recipe main [
  f <span class="Constant">2</span>:literal
]
recipe f [
  <span class="Constant">12</span>:integer<span class="Special"> &lt;- </span>next-ingredient
  <span class="Constant">13</span>:integer<span class="Special"> &lt;- </span>add <span class="Constant">1</span>:literal<span class="Delimiter">,</span> <span class="Constant">12</span>:integer
]
<span class="traceContains">+run: instruction f/1</span>
<span class="traceContains">+mem: location 12 is 2</span>
<span class="traceContains">+mem: storing 3 in location 13</span>

<span class="Delimiter">:(scenario next_ingredient_missing)</span>
recipe main [
  f
]
recipe f [
  _<span class="Delimiter">,</span> <span class="Constant">12</span>:integer<span class="Special"> &lt;- </span>next-ingredient
]
<span class="traceContains">+mem: storing 0 in location 12</span>

<span class="Delimiter">:(before &quot;End call Fields&quot;)</span>
vector&lt;vector&lt;long long int&gt; &gt; ingredient_atoms<span class="Delimiter">;</span>
index_t next_ingredient_to_process<span class="Delimiter">;</span>
<span class="Delimiter">:(replace{} &quot;call(recipe_number r)&quot;)</span>
call<span class="Delimiter">(</span>recipe_number r<span class="Delimiter">)</span> :running_recipe<span class="Delimiter">(</span>r<span class="Delimiter">),</span> running_step_index<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">),</span> next_ingredient_to_process<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{}</span>

<span class="Delimiter">:(replace &quot;Current_routine-&gt;calls.push(call(current_instruction().operation))&quot; following &quot;End Primitive Recipe Implementations&quot;)</span>
call callee<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>operation<span class="Delimiter">);</span>
for <span class="Delimiter">(</span>size_t i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>size<span class="Delimiter">();</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  callee<span class="Delimiter">.</span>ingredient_atoms<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>read_memory<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients[i]<span class="Delimiter">));</span>
<span class="Delimiter">}</span>
Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>push<span class="Delimiter">(</span>callee<span class="Delimiter">);</span>

<span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
NEXT_INGREDIENT<span class="Delimiter">,</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
Recipe_number[<span class="Constant">&quot;next-ingredient&quot;</span>] = NEXT_INGREDIENT<span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
case NEXT_INGREDIENT: <span class="Delimiter">{</span>
  if <span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>top<span class="Delimiter">().</span>next_ingredient_to_process &lt; Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>top<span class="Delimiter">().</span>ingredient_atoms<span class="Delimiter">.</span>size<span class="Delimiter">())</span> <span class="Delimiter">{</span>
    trace<span class="Delimiter">(</span><span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;product 0 is &quot;</span>
        &lt;&lt; Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>top<span class="Delimiter">().</span>ingredient_atoms[Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>top<span class="Delimiter">().</span>next_ingredient_to_process][<span class="Constant">0</span>]<span class="Delimiter">;</span>
    write_memory<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products[<span class="Constant">0</span>]<span class="Delimiter">,</span>
        Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>top<span class="Delimiter">().</span>ingredient_atoms[Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>top<span class="Delimiter">().</span>next_ingredient_to_process]<span class="Delimiter">);</span>
    if <span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>size<span class="Delimiter">()</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      vector&lt;long long int&gt; ingredient_exists<span class="Delimiter">;</span>
      ingredient_exists<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
      write_memory<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products[<span class="Constant">1</span>]<span class="Delimiter">,</span> ingredient_exists<span class="Delimiter">);</span>
    <span class="Delimiter">}</span>
    ++Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>top<span class="Delimiter">().</span>next_ingredient_to_process<span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  else <span class="Delimiter">{</span>
    if <span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>size<span class="Delimiter">()</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      vector&lt;long long int&gt; no_ingredient<span class="Delimiter">;</span>
      no_ingredient<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
      write_memory<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products[<span class="Constant">1</span>]<span class="Delimiter">,</span> no_ingredient<span class="Delimiter">);</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(scenario rewind_ingredients)</span>
recipe main [
  f <span class="Constant">2</span>:literal
]
recipe f [
  <span class="Constant">12</span>:integer<span class="Special"> &lt;- </span>next-ingredient  <span class="Comment"># consume ingredient</span>
  _<span class="Delimiter">,</span> <span class="Constant">1</span>:boolean<span class="Special"> &lt;- </span>next-ingredient  <span class="Comment"># will not find any ingredients</span>
  rewind-ingredients
  <span class="Constant">13</span>:integer<span class="Delimiter">,</span> <span class="Constant">2</span>:boolean<span class="Special"> &lt;- </span>next-ingredient  <span class="Comment"># will find ingredient again</span>
]
<span class="traceContains">+mem: storing 2 in location 12</span>
<span class="traceContains">+mem: storing 0 in location 1</span>
<span class="traceContains">+mem: storing 2 in location 13</span>
<span class="traceContains">+mem: storing 1 in location 2</span>

<span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
REWIND_INGREDIENTS<span class="Delimiter">,</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
Recipe_number[<span class="Constant">&quot;rewind-ingredients&quot;</span>] = REWIND_INGREDIENTS<span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
case REWIND_INGREDIENTS: <span class="Delimiter">{</span>
  Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>top<span class="Delimiter">().</span>next_ingredient_to_process = <span class="Constant">0</span><span class="Delimiter">;</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(scenario ingredient)</span>
recipe main [
  f <span class="Constant">1</span>:literal<span class="Delimiter">,</span> <span class="Constant">2</span>:literal
]
recipe f [
  <span class="Constant">12</span>:integer<span class="Special"> &lt;- </span>ingredient <span class="Constant">1</span>:literal  <span class="Comment"># consume second ingredient first</span>
  <span class="Constant">13</span>:integer<span class="Delimiter">,</span> <span class="Constant">1</span>:boolean<span class="Special"> &lt;- </span>next-ingredient  <span class="Comment"># next-ingredient tries to scan past that</span>
]
<span class="traceContains">+mem: storing 2 in location 12</span>
<span class="traceContains">+mem: storing 0 in location 1</span>

<span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
INGREDIENT<span class="Delimiter">,</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
Recipe_number[<span class="Constant">&quot;ingredient&quot;</span>] = INGREDIENT<span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
case INGREDIENT: <span class="Delimiter">{</span>
  if <span class="Delimiter">(</span>static_cast&lt;index_t&gt;<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients[<span class="Constant">0</span>]<span class="Delimiter">.</span>value<span class="Delimiter">)</span> &lt; Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>top<span class="Delimiter">().</span>ingredient_atoms<span class="Delimiter">.</span>size<span class="Delimiter">())</span> <span class="Delimiter">{</span>
    Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>top<span class="Delimiter">().</span>next_ingredient_to_process = current_instruction<span class="Delimiter">().</span>ingredients[<span class="Constant">0</span>]<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
    trace<span class="Delimiter">(</span><span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;product 0 is &quot;</span>
        &lt;&lt; Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>top<span class="Delimiter">().</span>ingredient_atoms[Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>top<span class="Delimiter">().</span>next_ingredient_to_process][<span class="Constant">0</span>]<span class="Delimiter">;</span>
    write_memory<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products[<span class="Constant">0</span>]<span class="Delimiter">,</span>
        Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>top<span class="Delimiter">().</span>ingredient_atoms[Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>top<span class="Delimiter">().</span>next_ingredient_to_process]<span class="Delimiter">);</span>
    if <span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>size<span class="Delimiter">()</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      vector&lt;long long int&gt; ingredient_exists<span class="Delimiter">;</span>
      ingredient_exists<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
      write_memory<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products[<span class="Constant">1</span>]<span class="Delimiter">,</span> ingredient_exists<span class="Delimiter">);</span>
    <span class="Delimiter">}</span>
    ++Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>top<span class="Delimiter">().</span>next_ingredient_to_process<span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  else <span class="Delimiter">{</span>
    if <span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>size<span class="Delimiter">()</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      vector&lt;long long int&gt; no_ingredient<span class="Delimiter">;</span>
      no_ingredient<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
      write_memory<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products[<span class="Constant">1</span>]<span class="Delimiter">,</span> no_ingredient<span class="Delimiter">);</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
</pre>
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