about summary refs log blame commit diff stats
path: root/html/040brace.cc.html
blob: c29284778308869e68ac6b1e2628b2e42ccb4081 (plain) (tree)
1
2
3
4
5
6
7
8
9
10
11
12



                                                                                          
                               






                                                                                         

                                                                                                 
                        
                                  
                             
                             

                              
                            
                               
                                  




































                                                                                                           
                                                                                                                  










                                                                                                                                     
                                                                                                                                            

                                                                                                
                                                                                                                                                          
                                                                                                           



                                                                                                                                                                                                                                                                                                                                   
                                                                                                                                                                                                                                                                                                                          
                                                                                                                                                                                                                                                             
                                    
                                                                                                                                                                                                
                                                                                                                                                                                                                                                                                                              
                                                                                                                                                                                                                                                              

                                    
                                                                                                                                                                       
                                                                                                                                                                                                                                                                                             
                                                                                                                                                                                                                                                                                                                                   
                                                                                                                                                                                  
                                                                                                                                                                                                

                                                                                                                           
                                    
                                                                                                                                                                                                

                                                                                      
                                    

                                                                                                                                                                                            




                                                                                                                                                                                                            
                                                                                                                                                                                                                                                                                         
                                                                              
                                    
                                                                
                                                                                                                                                                                                                                                                                
                                                                                                                                                       
                                                                                                                                                                                                                                                                                         
                                                                                                                                                           
        

                                                                                                                                                    
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
                                                                      
                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
                                                                                

                                      
                                         
                                                                        
                                                                                                                                                                                                                                                                                                                                                                                                                                        
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    

                                                                                
                                    



                                                                                                                                                                                                                       
                                                                                                                         
                                                                                                                                                                                                                                                 
                                                                                                                                                                                                                                                                                      
                                                                                                                                                                                                           
                                                           
                                                                                                                                                                                                                                                                                                                                                                       

                                                                                                                                                                   
                                                                                                                                                                                                                                                                                
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
                                                                                                                                                                                                                                                                                         
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
        
                                                                                                                                                                                                                                                                                                                                                        


                                  

                                                                                                      



                                                                                                                                                                                                                                                                                                                                                                        
                                                                                                                                                                                                 
                                                                                                                                                                                                                                      
                                  

                                                                                                                                                                                                                                               


                                                        
                                                                                                                          














                                                                                                         





                                                                                                                     


                                               

                                                                                                                
                                  
                                                                                                                  










                                                               
                                                                                                                









                                                              
                                                                                                                













                                                              

                                                                                                                

                                         
                                                                                                                  













                                                              

                                                                                                                
                                  

                                                                                                                  













                                                                    
                                                                                                                
                                  
                                                                                                                  

                                         
                                                                                                                    
                                    
                                                                                                                  





                                                                  
                                                                                                                
                                  
                                                                                                                  


                                         
                                                                                                                  





                                                                   
                                                                                                                
                                  
                                                                                                                  







                                                              
                                                    
             
                                                                                                                







                                                                 

                                                                                                                
                                  
                                                                                       
                                                                                                                  









                                                                        

                                                                                                                
                                  
                                                      
                                                                                                                  









                                                                         
                                                                                                                
                                  
                                                                                                                  
                                    
                                                                                                                    
                                    

                                                                                                                  






                                                                     
                                                                                                                
      
                                                                                                                







                                                                   
                                                                                      
                       

                                                                                                                
                                  

                                                                                                                                                                                           

                                                                                                                                                                                                    
                                                                                                                                                                                             

                                  
                                                                                                                                                                      

                                                          





                                                                     
                                                                  



                                     
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Mu - 040brace.cc</title>
<meta name="Generator" content="Vim/7.4">
<meta name="plugin-version" content="vim7.4_v1">
<meta name="syntax" content="cpp">
<meta name="settings" content="use_css,pre_wrap,no_foldcolumn,expand_tabs,prevent_copy=">
<meta name="colorscheme" content="minimal">
<style type="text/css">
<!--
pre { white-space: pre-wrap; font-family: monospace; color: #eeeeee; background-color: #080808; }
body { font-family: monospace; color: #eeeeee; background-color: #080808; }
* { font-size: 1.05em; }
.traceContains { color: #008000; }
.Constant { color: #00a0a0; }
.cSpecial { color: #008000; }
.Comment { color: #9090ff; }
.Delimiter { color: #a04060; }
.Special { color: #ff6060; }
.Identifier { color: #804000; }
.CommentedCode { color: #6c6c6c; }
-->
</style>

<script type='text/javascript'>
<!--

-->
</script>
</head>
<body>
<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">+after-brace: recipe main</span>
<span class="traceContains">+after-brace: jump 1:offset</span>
<span class="traceContains">+after-brace: copy ...</span>

<span class="Comment">//: one-time setup</span>
<span class="Delimiter">:(after &quot;int main&quot;)</span>
  Transform<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>transform_braces<span class="Delimiter">);</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>
<span class="CommentedCode">//?   cout &lt;&lt; &quot;AAA transform_braces\n&quot;; //? 1</span>
<span class="CommentedCode">//?   exit(0); //? 1</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>
  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>Recipe[r]<span class="Delimiter">.</span>steps<span class="Delimiter">);</span> ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    const instruction&amp; inst = Recipe[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">&quot;brace&quot;</span><span class="Delimiter">)</span> &lt;&lt; r &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">&quot;brace&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>
  trace<span class="Delimiter">(</span><span class="Constant">&quot;after-brace&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;recipe &quot;</span> &lt;&lt; Recipe[r]<span class="Delimiter">.</span>name &lt;&lt; end<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>Recipe[r]<span class="Delimiter">.</span>steps<span class="Delimiter">);</span> ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    instruction&amp; inst = Recipe[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>
      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>operation != Recipe_ordinal[<span class="Constant">&quot;loop&quot;</span>]
         &amp;&amp; inst<span class="Delimiter">.</span>operation != Recipe_ordinal[<span class="Constant">&quot;loop-if&quot;</span>]
         &amp;&amp; inst<span class="Delimiter">.</span>operation != Recipe_ordinal[<span class="Constant">&quot;loop-unless&quot;</span>]
         &amp;&amp; inst<span class="Delimiter">.</span>operation != Recipe_ordinal[<span class="Constant">&quot;break&quot;</span>]
         &amp;&amp; inst<span class="Delimiter">.</span>operation != Recipe_ordinal[<span class="Constant">&quot;break-if&quot;</span>]
         &amp;&amp; inst<span class="Delimiter">.</span>operation != Recipe_ordinal[<span class="Constant">&quot;break-unless&quot;</span>]<span class="Delimiter">)</span> <span class="Delimiter">{</span>
      trace<span class="Delimiter">(</span><span class="Constant">&quot;after-brace&quot;</span><span class="Delimiter">)</span> &lt;&lt; inst<span class="Delimiter">.</span>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">// update instruction operation</span>
    if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>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>
      inst<span class="Delimiter">.</span>operation = Recipe_ordinal[<span class="Constant">&quot;jump-if&quot;</span>]<span class="Delimiter">;</span>
    else if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>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>
      inst<span class="Delimiter">.</span>operation = Recipe_ordinal[<span class="Constant">&quot;jump-unless&quot;</span>]<span class="Delimiter">;</span>
    else
      inst<span class="Delimiter">.</span>operation = Recipe_ordinal[<span class="Constant">&quot;jump&quot;</span>]<span class="Delimiter">;</span>
    <span class="Comment">// check for explicitly provided targets</span>
    if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>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>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">&quot;after-brace&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">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">&quot;after-brace&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>types<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>Type_ordinal[<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 &lt;&lt; inst<span class="Delimiter">.</span>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>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="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;-if&quot;</span><span class="Delimiter">)</span> != string::npos<span class="Delimiter">)</span>
      trace<span class="Delimiter">(</span><span class="Constant">&quot;after-brace&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;jump-if &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;, &quot;</span> &lt;&lt; target<span class="Delimiter">.</span>value &lt;&lt; <span class="Constant">&quot;:offset&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    else if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>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>
      trace<span class="Delimiter">(</span><span class="Constant">&quot;after-brace&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;jump-unless &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;, &quot;</span> &lt;&lt; target<span class="Delimiter">.</span>value &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">&quot;after-brace&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;jump &quot;</span> &lt;&lt; target<span class="Delimiter">.</span>value &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 &lt;&lt; Recipe[r]<span class="Delimiter">.</span>name &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>Recipe[r]<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  <span class="Comment">// exit current routine</span>
<span class="Delimiter">}</span>

<span class="Comment">// temporarily suppress run</span>
void transform<span class="Delimiter">(</span>string form<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  load<span class="Delimiter">(</span>form<span class="Delimiter">);</span>
  transform_all<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.</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>
Recipe_ordinal[<span class="Constant">&quot;break&quot;</span>] = BREAK<span class="Delimiter">;</span>
Recipe_ordinal[<span class="Constant">&quot;break-if&quot;</span>] = BREAK_IF<span class="Delimiter">;</span>
Recipe_ordinal[<span class="Constant">&quot;break-unless&quot;</span>] = BREAK_UNLESS<span class="Delimiter">;</span>
Recipe_ordinal[<span class="Constant">&quot;loop&quot;</span>] = LOOP<span class="Delimiter">;</span>
Recipe_ordinal[<span class="Constant">&quot;loop-if&quot;</span>] = LOOP_IF<span class="Delimiter">;</span>
Recipe_ordinal[<span class="Constant">&quot;loop-unless&quot;</span>] = LOOP_UNLESS<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">+after-brace: recipe main</span>
<span class="traceContains">+after-brace: copy ...</span>
<span class="traceContains">+after-brace: copy ...</span>
<span class="traceContains">+after-brace: copy ...</span>
<span class="traceContains">+after-brace: 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">+after-brace: recipe main</span>
<span class="traceContains">+after-brace: copy ...</span>
<span class="traceContains">+after-brace: 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">+after-brace: recipe main</span>
<span class="traceContains">+after-brace: copy ...</span>
<span class="traceContains">+after-brace: jump 0:offset</span>
<span class="traceContains">+after-brace: jump 0:offset</span>

<span class="Delimiter">:(scenario break_cascading2)</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">+after-brace: recipe main</span>
<span class="traceContains">+after-brace: copy ...</span>
<span class="traceContains">+after-brace: copy ...</span>
<span class="traceContains">+after-brace: jump 1:offset</span>
<span class="traceContains">+after-brace: copy ...</span>
<span class="traceContains">+after-brace: 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">+after-brace: recipe main</span>
<span class="traceContains">+after-brace: copy ...</span>
<span class="traceContains">+after-brace: copy ...</span>
<span class="traceContains">+after-brace: jump-if 2, 1:offset</span>
<span class="traceContains">+after-brace: copy ...</span>
<span class="traceContains">+after-brace: 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">+after-brace: 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">+after-brace: jump 3:offset</span>

<span class="Delimiter">:(scenario break_nested_degenerate2)</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">+after-brace: jump 2:offset</span>

<span class="Delimiter">:(scenario break_label)</span>
<span class="Special">% Hide_warnings = 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">+after-brace: 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">+after-brace: recipe main</span>
<span class="traceContains">+after-brace: copy ...</span>
<span class="traceContains">+after-brace: copy ...</span>
<span class="traceContains">+after-brace: jump-unless 2, 1:offset</span>
<span class="traceContains">+after-brace: 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">+after-brace: recipe main</span>
<span class="traceContains">+after-brace: copy ...</span>
<span class="traceContains">+after-brace: copy ...</span>
<span class="traceContains">+after-brace: jump-unless 2, -1:offset</span>
<span class="traceContains">+after-brace: 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">+after-brace: recipe main</span>
<span class="traceContains">+after-brace: 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">+after-brace: recipe main</span>
<span class="traceContains">+after-brace: copy ...</span>
<span class="traceContains">+after-brace: 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>
<span class="CommentedCode">#? % Trace_stream-&gt;dump_layer = &quot;run&quot;;</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_warns)</span>
<span class="Special">% Hide_warnings = true;</span>
recipe main [
  <span class="Identifier">break</span>
]
<span class="traceContains">+warn: break needs a '{' before</span>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->