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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>
def 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>
<span class="Normal">void</span> transform_braces<span class="Delimiter">(</span><span class="Normal">const</span> recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Normal">const</span> <span class="Normal">int</span> 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;<span class="Normal">int</span><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><span class="Normal">int</span>&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>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> 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>
    <span class="Normal">const</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>
    <span class="Normal">if</span> <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;<span class="Normal">int</span><span class="Delimiter">,</span><span class="Normal">int</span>&gt;<span class="Delimiter">(</span>OPEN<span class="Delimiter">,</span> index<span class="Delimiter">));</span>
    <span class="Delimiter">}</span>
    <span class="Normal">if</span> <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;<span class="Normal">int</span><span class="Delimiter">,</span><span class="Normal">int</span>&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><span class="Normal">int</span>&gt; open_braces<span class="Delimiter">;</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> 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>
    <span class="Normal">if</span> <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>
    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label == <span class="Constant">&quot;}&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      <span class="Normal">if</span> <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> &lt;&lt; end<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>
    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>is_label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
    <span class="Normal">if</span> <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>
    <span class="Normal">if</span> <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="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
        raise &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>
    <span class="Normal">if</span> <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>
    <span class="Normal">else</span> <span class="Normal">if</span> <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>
    <span class="Normal">else</span> <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>
    <span class="Normal">if</span> <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>
      <span class="Normal">if</span> <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>
    <span class="Normal">else</span> <span class="Delimiter">{</span>
      <span class="Comment">// unconditional branches check arg 0</span>
      <span class="Normal">if</span> <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 = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span><span class="Constant">&quot;offset&quot;</span><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>set_value<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>open_braces<span class="Delimiter">.</span>empty<span class="Delimiter">())</span>
      raise &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>
    <span class="Normal">else</span> <span class="Normal">if</span> <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>
    <span class="Normal">else</span>  <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>
    <span class="Normal">if</span> <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>
    <span class="Normal">else</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">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>
<span class="Normal">int</span> matching_brace<span class="Delimiter">(</span><span class="Normal">int</span> index<span class="Delimiter">,</span> <span class="Normal">const</span> list&lt;pair&lt;<span class="Normal">int</span><span class="Delimiter">,</span> <span class="Normal">int</span>&gt; &gt;&amp; braces<span class="Delimiter">,</span> recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Normal">int</span> stacksize = <span class="Constant">0</span><span class="Delimiter">;</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span>list&lt;pair&lt;<span class="Normal">int</span><span class="Delimiter">,</span> <span class="Normal">int</span>&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>
    <span class="Normal">if</span> <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>
    <span class="Normal">if</span> <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 &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>
def 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>
def 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>
def 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>
def 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>
def 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="Normal">if</span> <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>
def 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>
def 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>
def 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>
def 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>
def 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>
def 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>
def 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-<span class="Normal">if</span> <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>
def 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>
def 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>-<span class="Normal">if</span> <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>
def 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>
def main [
  <span class="Delimiter">{</span>
    <span class="Identifier">break</span>-<span class="Normal">if</span>
  <span class="Delimiter">}</span>
]
<span class="traceContains">+error: break-if expects 1 or 2 ingredients, but got none</span>

<span class="Comment">//: Using break we can now implement conditional returns.</span>

<span class="Delimiter">:(scenario return_if)</span>
def main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>test1
]
def test1 [
  <span class="Identifier">return</span>-<span class="Normal">if</span> <span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">34</span>
  <span class="Identifier">return</span> <span class="Constant">35</span>
]
<span class="traceContains">+mem: storing 35 in location 1</span>

<span class="Delimiter">:(scenario return_if_2)</span>
def main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>test1
]
def test1 [
  <span class="Identifier">return</span>-<span class="Normal">if</span> <span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">34</span>
  <span class="Identifier">return</span> <span class="Constant">35</span>
]
<span class="traceContains">+mem: storing 34 in location 1</span>

<span class="Delimiter">:(before &quot;End Rewrite Instruction(curr, recipe result)&quot;)</span>
<span class="Comment">// rewrite `return-if a, b, c, ...` to</span>
<span class="Comment">//   ```</span>
<span class="Comment">//   {</span>
<span class="Comment">//     break-unless a</span>
<span class="Comment">//     return b, c, ...</span>
<span class="Comment">//   }</span>
<span class="Comment">//   ```</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>name == <span class="Constant">&quot;return-if&quot;</span> || curr<span class="Delimiter">.</span>name == <span class="Constant">&quot;reply-if&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
    emit_return_block<span class="Delimiter">(</span>result<span class="Delimiter">,</span> <span class="Constant">&quot;break-unless&quot;</span><span class="Delimiter">,</span> curr<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>
    curr<span class="Delimiter">.</span>clear<span class="Delimiter">();</span>
  <span class="Delimiter">}</span>
  <span class="Normal">else</span> <span class="Delimiter">{</span>
    raise &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; curr<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' never yields any products</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Comment">// rewrite `return-unless a, b, c, ...` to</span>
<span class="Comment">//   ```</span>
<span class="Comment">//   {</span>
<span class="Comment">//     break-if a</span>
<span class="Comment">//     return b, c, ...</span>
<span class="Comment">//   }</span>
<span class="Comment">//   ```</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>name == <span class="Constant">&quot;return-unless&quot;</span> || curr<span class="Delimiter">.</span>name == <span class="Constant">&quot;reply-unless&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
    emit_return_block<span class="Delimiter">(</span>result<span class="Delimiter">,</span> <span class="Constant">&quot;break-if&quot;</span><span class="Delimiter">,</span> curr<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>
    curr<span class="Delimiter">.</span>clear<span class="Delimiter">();</span>
  <span class="Delimiter">}</span>
  <span class="Normal">else</span> <span class="Delimiter">{</span>
    raise &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; curr<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' never yields any products</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(code)</span>
<span class="Normal">void</span> emit_return_block<span class="Delimiter">(</span>recipe&amp; out<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; break_command<span class="Delimiter">,</span> <span class="Normal">const</span> vector&lt;reagent&gt;&amp; ingredients<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  reagent condition = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
  vector&lt;reagent&gt; return_ingredients<span class="Delimiter">;</span>
  copy<span class="Delimiter">(</span>++ingredients<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> ingredients<span class="Delimiter">.</span>end<span class="Delimiter">(),</span> inserter<span class="Delimiter">(</span>return_ingredients<span class="Delimiter">,</span> return_ingredients<span class="Delimiter">.</span>end<span class="Delimiter">()));</span>

  <span class="Comment">// {</span>
  instruction open_label<span class="Delimiter">;</span>  open_label<span class="Delimiter">.</span>is_label=<span class="Constant">true</span><span class="Delimiter">;</span>  open_label<span class="Delimiter">.</span>label = <span class="Constant">&quot;{&quot;</span><span class="Delimiter">;</span>
  out<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>open_label<span class="Delimiter">);</span>

  <span class="Comment">// &lt;break command&gt; &lt;condition&gt;</span>
  instruction break_inst<span class="Delimiter">;</span>
  break_inst<span class="Delimiter">.</span>operation = get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> break_command<span class="Delimiter">);</span>
  break_inst<span class="Delimiter">.</span>name = break_inst<span class="Delimiter">.</span>old_name = break_command<span class="Delimiter">;</span>
  break_inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>condition<span class="Delimiter">);</span>
  out<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>break_inst<span class="Delimiter">);</span>

  <span class="Comment">// return &lt;return ingredients&gt;</span>
  instruction return_inst<span class="Delimiter">;</span>
  return_inst<span class="Delimiter">.</span>operation = get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;return&quot;</span><span class="Delimiter">);</span>
  return_inst<span class="Delimiter">.</span>name = <span class="Constant">&quot;return&quot;</span><span class="Delimiter">;</span>
  return_inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>swap<span class="Delimiter">(</span>return_ingredients<span class="Delimiter">);</span>
  out<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>return_inst<span class="Delimiter">);</span>

  <span class="Comment">// }</span>
  instruction close_label<span class="Delimiter">;</span>  close_label<span class="Delimiter">.</span>is_label=<span class="Constant">true</span><span class="Delimiter">;</span>  close_label<span class="Delimiter">.</span>label = <span class="Constant">&quot;}&quot;</span><span class="Delimiter">;</span>
  out<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>close_label<span class="Delimiter">);</span>
<span class="Delimiter">}</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>
<span class="Normal">case</span> BREAK: <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Normal">case</span> BREAK_IF: <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Normal">case</span> BREAK_UNLESS: <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Normal">case</span> LOOP: <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Normal">case</span> LOOP_IF: <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Normal">case</span> LOOP_UNLESS: <span class="Identifier">break</span><span class="Delimiter">;</span>
</pre>
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