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<pre id='vimCodeElement'>
<span class="Comment">//: Structured programming</span>
<span class="Comment">//:</span>
<span class="Comment">//: Our jump recipes are quite inconvenient to use, so mu provides a</span>
<span class="Comment">//: lightweight tool called 'transform_braces' to work in a slightly more</span>
<span class="Comment">//: convenient format with nested braces:</span>
<span class="Comment">//:</span>
<span class="Comment">//:   {</span>
<span class="Comment">//:     some instructions</span>
<span class="Comment">//:     {</span>
<span class="Comment">//:       more instructions</span>
<span class="Comment">//:     }</span>
<span class="Comment">//:   }</span>
<span class="Comment">//:</span>
<span class="Comment">//: Braces are just labels, they require no special parsing. The pseudo</span>
<span class="Comment">//: recipes 'loop' and 'break' jump to just after the enclosing '{' and '}'</span>
<span class="Comment">//: respectively.</span>
<span class="Comment">//:</span>
<span class="Comment">//: Conditional and unconditional 'loop' and 'break' should give us 80% of the</span>
<span class="Comment">//: benefits of the control-flow primitives we're used to in other languages,</span>
<span class="Comment">//: like 'if', 'while', 'for', etc.</span>

<span class="Delimiter">:(scenarios transform)</span>
<span class="Delimiter">:(scenario brace_conversion)</span>
recipe main [
  <span class="Delimiter">{</span>
    <span class="Identifier">break</span>
    <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">}</span>
]
<span class="traceContains">+transform: --- transform braces for recipe main</span>
<span class="traceContains">+transform: jump 1:offset</span>
<span class="traceContains">+transform: copy ...</span>

<span class="Delimiter">:(before &quot;End Instruction Modifying Transforms&quot;)</span>
Transform<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>transform_braces<span class="Delimiter">);</span>  <span class="Comment">// idempotent</span>

<span class="Delimiter">:(code)</span>
void transform_braces<span class="Delimiter">(</span>const recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  const int OPEN = <span class="Constant">0</span><span class="Delimiter">,</span> CLOSE = <span class="Constant">1</span><span class="Delimiter">;</span>
  <span class="Comment">// use signed integer for step index because we'll be doing arithmetic on it</span>
  list&lt;pair&lt;int<span class="Comment">/*</span><span class="Comment">OPEN/CLOSE</span><span class="Comment">*/</span><span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">step</span><span class="Comment">*/</span>long long int&gt; &gt; braces<span class="Delimiter">;</span>
  trace<span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- transform braces for recipe &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name &lt;&lt; end<span class="Delimiter">();</span>
<span class="CommentedCode">//?   cerr &lt;&lt; &quot;--- transform braces for recipe &quot; &lt;&lt; get(Recipe, r).name &lt;&lt; '\n';</span>
  for <span class="Delimiter">(</span>long long int index = <span class="Constant">0</span><span class="Delimiter">;</span> index &lt; SIZE<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">);</span> ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    const instruction&amp; inst = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
    if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label == <span class="Constant">&quot;{&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      trace<span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;push (open, &quot;</span> &lt;&lt; index &lt;&lt; <span class="Constant">&quot;)&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
      braces<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;int<span class="Delimiter">,</span>long long int&gt;<span class="Delimiter">(</span>OPEN<span class="Delimiter">,</span> index<span class="Delimiter">));</span>
    <span class="Delimiter">}</span>
    if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label == <span class="Constant">&quot;}&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      trace<span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;push (close, &quot;</span> &lt;&lt; index &lt;&lt; <span class="Constant">&quot;)&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
      braces<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;int<span class="Delimiter">,</span>long long int&gt;<span class="Delimiter">(</span>CLOSE<span class="Delimiter">,</span> index<span class="Delimiter">));</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  stack&lt;<span class="Comment">/*</span><span class="Comment">step</span><span class="Comment">*/</span>long long int&gt; open_braces<span class="Delimiter">;</span>
  for <span class="Delimiter">(</span>long long int index = <span class="Constant">0</span><span class="Delimiter">;</span> index &lt; SIZE<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">);</span> ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    instruction&amp; inst = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
    if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label == <span class="Constant">&quot;{&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      open_braces<span class="Delimiter">.</span>push<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
      <span class="Identifier">continue</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
    if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label == <span class="Constant">&quot;}&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      if <span class="Delimiter">(</span>open_braces<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
        raise &lt;&lt; <span class="Constant">&quot;missing '{' in &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
        <span class="Identifier">return</span><span class="Delimiter">;</span>
      <span class="Delimiter">}</span>
      open_braces<span class="Delimiter">.</span>pop<span class="Delimiter">();</span>
      <span class="Identifier">continue</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
    if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>is_label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
    if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>old_name != <span class="Constant">&quot;loop&quot;</span>
         &amp;&amp; inst<span class="Delimiter">.</span>old_name != <span class="Constant">&quot;loop-if&quot;</span>
         &amp;&amp; inst<span class="Delimiter">.</span>old_name != <span class="Constant">&quot;loop-unless&quot;</span>
         &amp;&amp; inst<span class="Delimiter">.</span>old_name != <span class="Constant">&quot;break&quot;</span>
         &amp;&amp; inst<span class="Delimiter">.</span>old_name != <span class="Constant">&quot;break-if&quot;</span>
         &amp;&amp; inst<span class="Delimiter">.</span>old_name != <span class="Constant">&quot;break-unless&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      trace<span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; inst<span class="Delimiter">.</span>old_name &lt;&lt; <span class="Constant">&quot; ...&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
      <span class="Identifier">continue</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
    <span class="Comment">// check for errors</span>
    if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>old_name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;-if&quot;</span><span class="Delimiter">)</span> != string::npos || inst<span class="Delimiter">.</span>old_name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;-unless&quot;</span><span class="Delimiter">)</span> != string::npos<span class="Delimiter">)</span> <span class="Delimiter">{</span>
      if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
        raise_error &lt;&lt; inst<span class="Delimiter">.</span>old_name &lt;&lt; <span class="Constant">&quot; expects 1 or 2 ingredients, but got none</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
        <span class="Identifier">continue</span><span class="Delimiter">;</span>
      <span class="Delimiter">}</span>
    <span class="Delimiter">}</span>
    <span class="Comment">// update instruction operation</span>
    if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>old_name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;-if&quot;</span><span class="Delimiter">)</span> != string::npos<span class="Delimiter">)</span> <span class="Delimiter">{</span>
      inst<span class="Delimiter">.</span>name = <span class="Constant">&quot;jump-if&quot;</span><span class="Delimiter">;</span>
      inst<span class="Delimiter">.</span>operation = JUMP_IF<span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
    else if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>old_name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;-unless&quot;</span><span class="Delimiter">)</span> != string::npos<span class="Delimiter">)</span> <span class="Delimiter">{</span>
      inst<span class="Delimiter">.</span>name = <span class="Constant">&quot;jump-unless&quot;</span><span class="Delimiter">;</span>
      inst<span class="Delimiter">.</span>operation = JUMP_UNLESS<span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
    else <span class="Delimiter">{</span>
      inst<span class="Delimiter">.</span>name = <span class="Constant">&quot;jump&quot;</span><span class="Delimiter">;</span>
      inst<span class="Delimiter">.</span>operation = JUMP<span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
    <span class="Comment">// check for explicitly provided targets</span>
    if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>old_name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;-if&quot;</span><span class="Delimiter">)</span> != string::npos || inst<span class="Delimiter">.</span>old_name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;-unless&quot;</span><span class="Delimiter">)</span> != string::npos<span class="Delimiter">)</span> <span class="Delimiter">{</span>
      <span class="Comment">// conditional branches check arg 1</span>
      if <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &gt; <span class="Constant">1</span> &amp;&amp; is_literal<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
        trace<span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; inst<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">' '</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;:offset&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
        <span class="Identifier">continue</span><span class="Delimiter">;</span>
      <span class="Delimiter">}</span>
    <span class="Delimiter">}</span>
    else <span class="Delimiter">{</span>
      <span class="Comment">// unconditional branches check arg 0</span>
      if <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; is_literal<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
        trace<span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;jump &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;:offset&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
        <span class="Identifier">continue</span><span class="Delimiter">;</span>
      <span class="Delimiter">}</span>
    <span class="Delimiter">}</span>
    <span class="Comment">// if implicit, compute target</span>
    reagent target<span class="Delimiter">;</span>
    target<span class="Delimiter">.</span>type = new type_tree<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;offset&quot;</span><span class="Delimiter">));</span>
    target<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>second = new string_tree<span class="Delimiter">(</span><span class="Constant">&quot;offset&quot;</span><span class="Delimiter">);</span>
    target<span class="Delimiter">.</span>set_value<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
    if <span class="Delimiter">(</span>open_braces<span class="Delimiter">.</span>empty<span class="Delimiter">())</span>
      raise_error &lt;&lt; inst<span class="Delimiter">.</span>old_name &lt;&lt; <span class="Constant">&quot; needs a '{' before</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    else if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>old_name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;loop&quot;</span><span class="Delimiter">)</span> != string::npos<span class="Delimiter">)</span>
      target<span class="Delimiter">.</span>set_value<span class="Delimiter">(</span>open_braces<span class="Delimiter">.</span>top<span class="Delimiter">()</span>-index<span class="Delimiter">);</span>
    else  <span class="Comment">// break instruction</span>
      target<span class="Delimiter">.</span>set_value<span class="Delimiter">(</span>matching_brace<span class="Delimiter">(</span>open_braces<span class="Delimiter">.</span>top<span class="Delimiter">(),</span> braces<span class="Delimiter">,</span> r<span class="Delimiter">)</span> - index - <span class="Constant">1</span><span class="Delimiter">);</span>
    inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>target<span class="Delimiter">);</span>
    <span class="Comment">// log computed target</span>
    if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;jump&quot;</span><span class="Delimiter">)</span>
      trace<span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;jump &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>target<span class="Delimiter">.</span>value<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;:offset&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    else
      trace<span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; inst<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">' '</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>target<span class="Delimiter">.</span>value<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;:offset&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

<span class="Comment">// returns a signed integer not just so that we can return -1 but also to</span>
<span class="Comment">// enable future signed arithmetic</span>
long long int matching_brace<span class="Delimiter">(</span>long long int index<span class="Delimiter">,</span> const list&lt;pair&lt;int<span class="Delimiter">,</span> long long int&gt; &gt;&amp; braces<span class="Delimiter">,</span> recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  int stacksize = <span class="Constant">0</span><span class="Delimiter">;</span>
  for <span class="Delimiter">(</span>list&lt;pair&lt;int<span class="Delimiter">,</span> long long int&gt; &gt;::const_iterator p = braces<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != braces<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    if <span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>second &lt; index<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
    stacksize += <span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>first ? <span class="Constant">1</span> : -<span class="Constant">1</span><span class="Delimiter">);</span>
    if <span class="Delimiter">(</span>stacksize == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">return</span> p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  raise_error &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;unbalanced '{'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
  <span class="Identifier">return</span> SIZE<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">);</span>  <span class="Comment">// exit current routine</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(scenario loop)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">{</span>
    <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
    loop
  <span class="Delimiter">}</span>
]
<span class="traceContains">+transform: --- transform braces for recipe main</span>
<span class="traceContains">+transform: copy ...</span>
<span class="traceContains">+transform: copy ...</span>
<span class="traceContains">+transform: copy ...</span>
<span class="traceContains">+transform: jump -2:offset</span>

<span class="Delimiter">:(scenario break_empty_block)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">{</span>
    <span class="Identifier">break</span>
  <span class="Delimiter">}</span>
]
<span class="traceContains">+transform: --- transform braces for recipe main</span>
<span class="traceContains">+transform: copy ...</span>
<span class="traceContains">+transform: jump 0:offset</span>

<span class="Delimiter">:(scenario break_cascading)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">{</span>
    <span class="Identifier">break</span>
  <span class="Delimiter">}</span>
  <span class="Delimiter">{</span>
    <span class="Identifier">break</span>
  <span class="Delimiter">}</span>
]
<span class="traceContains">+transform: --- transform braces for recipe main</span>
<span class="traceContains">+transform: copy ...</span>
<span class="traceContains">+transform: jump 0:offset</span>
<span class="traceContains">+transform: jump 0:offset</span>

<span class="Delimiter">:(scenario break_cascading_2)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">{</span>
    <span class="Identifier">break</span>
    <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">}</span>
  <span class="Delimiter">{</span>
    <span class="Identifier">break</span>
  <span class="Delimiter">}</span>
]
<span class="traceContains">+transform: --- transform braces for recipe main</span>
<span class="traceContains">+transform: copy ...</span>
<span class="traceContains">+transform: copy ...</span>
<span class="traceContains">+transform: jump 1:offset</span>
<span class="traceContains">+transform: copy ...</span>
<span class="traceContains">+transform: jump 0:offset</span>

<span class="Delimiter">:(scenario break_if)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">{</span>
    <span class="Identifier">break</span>-if <span class="Constant">2</span>:number
    <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">}</span>
  <span class="Delimiter">{</span>
    <span class="Identifier">break</span>
  <span class="Delimiter">}</span>
]
<span class="traceContains">+transform: --- transform braces for recipe main</span>
<span class="traceContains">+transform: copy ...</span>
<span class="traceContains">+transform: copy ...</span>
<span class="traceContains">+transform: jump-if 2, 1:offset</span>
<span class="traceContains">+transform: copy ...</span>
<span class="traceContains">+transform: jump 0:offset</span>

<span class="Delimiter">:(scenario break_nested)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">{</span>
    <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
    <span class="Identifier">break</span>
    <span class="Delimiter">{</span>
      <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
    <span class="Delimiter">}</span>
    <span class="Constant">4</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">}</span>
]
<span class="traceContains">+transform: jump 4:offset</span>

<span class="Delimiter">:(scenario break_nested_degenerate)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">{</span>
    <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
    <span class="Identifier">break</span>
    <span class="Delimiter">{</span>
    <span class="Delimiter">}</span>
    <span class="Constant">4</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">}</span>
]
<span class="traceContains">+transform: jump 3:offset</span>

<span class="Delimiter">:(scenario break_nested_degenerate_2)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">{</span>
    <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
    <span class="Identifier">break</span>
    <span class="Delimiter">{</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
]
<span class="traceContains">+transform: jump 2:offset</span>

<span class="Delimiter">:(scenario break_label)</span>
<span class="Special">% Hide_errors = true;</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">{</span>
    <span class="Identifier">break</span> +foo:offset
  <span class="Delimiter">}</span>
]
<span class="traceContains">+transform: jump +foo:offset</span>

<span class="Delimiter">:(scenario break_unless)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">{</span>
    <span class="Identifier">break</span>-unless <span class="Constant">2</span>:number
    <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">}</span>
]
<span class="traceContains">+transform: --- transform braces for recipe main</span>
<span class="traceContains">+transform: copy ...</span>
<span class="traceContains">+transform: copy ...</span>
<span class="traceContains">+transform: jump-unless 2, 1:offset</span>
<span class="traceContains">+transform: copy ...</span>

<span class="Delimiter">:(scenario loop_unless)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">{</span>
    loop-unless <span class="Constant">2</span>:number
    <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">}</span>
]
<span class="traceContains">+transform: --- transform braces for recipe main</span>
<span class="traceContains">+transform: copy ...</span>
<span class="traceContains">+transform: copy ...</span>
<span class="traceContains">+transform: jump-unless 2, -1:offset</span>
<span class="traceContains">+transform: copy ...</span>

<span class="Delimiter">:(scenario loop_nested)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">{</span>
    <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
    <span class="Delimiter">{</span>
      <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
    <span class="Delimiter">}</span>
    loop-if <span class="Constant">4</span>:boolean
    <span class="Constant">5</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">}</span>
]
<span class="traceContains">+transform: --- transform braces for recipe main</span>
<span class="traceContains">+transform: jump-if 4, -5:offset</span>

<span class="Delimiter">:(scenario loop_label)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  +foo
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
]
<span class="traceContains">+transform: --- transform braces for recipe main</span>
<span class="traceContains">+transform: copy ...</span>
<span class="traceContains">+transform: copy ...</span>

<span class="Comment">//: test how things actually run</span>
<span class="Delimiter">:(scenarios run)</span>
<span class="Delimiter">:(scenario brace_conversion_and_run)</span>
recipe test-factorial [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">5</span>
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>
  <span class="Delimiter">{</span>
    <span class="Constant">3</span>:boolean<span class="Special"> &lt;- </span>equal <span class="Constant">1</span>:number<span class="Delimiter">,</span> <span class="Constant">1</span>
    <span class="Identifier">break</span>-if <span class="Constant">3</span>:boolean
<span class="Comment">#    $print 1:number</span>
    <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>multiply <span class="Constant">2</span>:number<span class="Delimiter">,</span> <span class="Constant">1</span>:number
    <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>subtract <span class="Constant">1</span>:number<span class="Delimiter">,</span> <span class="Constant">1</span>
    loop
  <span class="Delimiter">}</span>
  <span class="Constant">4</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">2</span>:number  <span class="Comment"># trigger a read</span>
]
<span class="traceContains">+mem: location 2 is 120</span>

<span class="Delimiter">:(scenario break_outside_braces_fails)</span>
<span class="Special">% Hide_errors = true;</span>
recipe main [
  <span class="Identifier">break</span>
]
<span class="traceContains">+error: break needs a '{' before</span>

<span class="Delimiter">:(scenario break_conditional_without_ingredient_fails)</span>
<span class="Special">% Hide_errors = true;</span>
recipe main [
  <span class="Delimiter">{</span>
    <span class="Identifier">break</span>-if
  <span class="Delimiter">}</span>
]
<span class="traceContains">+error: break-if expects 1 or 2 ingredients, but got none</span>

<span class="Comment">//: Make sure these pseudo recipes get consistent numbers in all tests, even</span>
<span class="Comment">//: though they aren't implemented. Allows greater flexibility in ordering</span>
<span class="Comment">//: transforms.</span>

<span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
BREAK<span class="Delimiter">,</span>
BREAK_IF<span class="Delimiter">,</span>
BREAK_UNLESS<span class="Delimiter">,</span>
LOOP<span class="Delimiter">,</span>
LOOP_IF<span class="Delimiter">,</span>
LOOP_UNLESS<span class="Delimiter">,</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;break&quot;</span><span class="Delimiter">,</span> BREAK<span class="Delimiter">);</span>
put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;break-if&quot;</span><span class="Delimiter">,</span> BREAK_IF<span class="Delimiter">);</span>
put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;break-unless&quot;</span><span class="Delimiter">,</span> BREAK_UNLESS<span class="Delimiter">);</span>
put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;loop&quot;</span><span class="Delimiter">,</span> LOOP<span class="Delimiter">);</span>
put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;loop-if&quot;</span><span class="Delimiter">,</span> LOOP_IF<span class="Delimiter">);</span>
put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;loop-unless&quot;</span><span class="Delimiter">,</span> LOOP_UNLESS<span class="Delimiter">);</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
case BREAK: <span class="Identifier">break</span><span class="Delimiter">;</span>
case BREAK_IF: <span class="Identifier">break</span><span class="Delimiter">;</span>
case BREAK_UNLESS: <span class="Identifier">break</span><span class="Delimiter">;</span>
case LOOP: <span class="Identifier">break</span><span class="Delimiter">;</span>
case LOOP_IF: <span class="Identifier">break</span><span class="Delimiter">;</span>
case LOOP_UNLESS: <span class="Identifier">break</span><span class="Delimiter">;</span>
</pre>
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