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mu/html/003trace.cc.html
Kartik Agaram 08a0eed699 4891 
Couple more tweaks to html rendering:
a) SubX definitions no longer link redundantly to themselves. This long-standing
issue turns out to be tractable to solve for SubX files since the syntax
is so simple.
b) Fix links to SubX definitions in other directories. I forgot that I
have to always generate tags from the directory of the file being linkified.
c) Fix link colors. Before we lost all syntax highlighting for functions
and Globals. Now they maintain their colors, just add an underline.
2018-12-30 00:02:42 -08:00

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<!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 - 003trace.cc</title>
<meta name="Generator" content="Vim/8.0">
<meta name="plugin-version" content="vim7.4_v2">
<meta name="syntax" content="cpp">
<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
<meta name="colorscheme" content="minimal-light">
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<a href='https://github.com/akkartik/mu/blob/master/003trace.cc'>https://github.com/akkartik/mu/blob/master/003trace.cc</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment">//: The goal of layers is to make programs more easy to understand and more</span>
<span id="L2" class="LineNr"> 2 </span><span class="Comment">//: malleable, easy to rewrite in radical ways without accidentally breaking</span>
<span id="L3" class="LineNr"> 3 </span><span class="Comment">//: some corner case. Tests further both goals. They help understandability by</span>
<span id="L4" class="LineNr"> 4 </span><span class="Comment">//: letting one make small changes and get feedback. What if I wrote this line</span>
<span id="L5" class="LineNr"> 5 </span><span class="Comment">//: like so? What if I removed this function call, is it really necessary?</span>
<span id="L6" class="LineNr"> 6 </span><span class="Comment">//: Just try it, see if the tests pass. Want to explore rewriting this bit in</span>
<span id="L7" class="LineNr"> 7 </span><span class="Comment">//: this way? Tests put many refactorings on a firmer footing.</span>
<span id="L8" class="LineNr"> 8 </span><span class="Comment">//:</span>
<span id="L9" class="LineNr"> 9 </span><span class="Comment">//: But the usual way we write tests seems incomplete. Refactorings tend to</span>
<span id="L10" class="LineNr"> 10 </span><span class="Comment">//: work in the small, but don't help with changes to function boundaries. If</span>
<span id="L11" class="LineNr"> 11 </span><span class="Comment">//: you want to extract a new function you have to manually test-drive it to</span>
<span id="L12" class="LineNr"> 12 </span><span class="Comment">//: create tests for it. If you want to inline a function its tests are no</span>
<span id="L13" class="LineNr"> 13 </span><span class="Comment">//: longer valid. In both cases you end up having to reorganize code as well as</span>
<span id="L14" class="LineNr"> 14 </span><span class="Comment">//: tests, an error-prone activity.</span>
<span id="L15" class="LineNr"> 15 </span><span class="Comment">//:</span>
<span id="L16" class="LineNr"> 16 </span><span class="Comment">//: In response, this layer introduces the notion of *domain-driven* testing.</span>
<span id="L17" class="LineNr"> 17 </span><span class="Comment">//: We focus on the domain of inputs the whole program needs to handle rather</span>
<span id="L18" class="LineNr"> 18 </span><span class="Comment">//: than the correctness of individual functions. All tests invoke the program</span>
<span id="L19" class="LineNr"> 19 </span><span class="Comment">//: in a single way: by calling run() with some input. As the program operates</span>
<span id="L20" class="LineNr"> 20 </span><span class="Comment">//: on the input, it traces out a list of _facts_ deduced about the domain:</span>
<span id="L21" class="LineNr"> 21 </span><span class="Comment">//: trace(&quot;label&quot;) &lt;&lt; &quot;fact 1: &quot; &lt;&lt; val;</span>
<span id="L22" class="LineNr"> 22 </span><span class="Comment">//:</span>
<span id="L23" class="LineNr"> 23 </span><span class="Comment">//: Tests can now check these facts:</span>
<span id="L24" class="LineNr"> 24 </span><span class="Comment">//: :(scenario foo)</span>
<span id="L25" class="LineNr"> 25 </span><span class="Comment">//: 34 # call run() with this input</span>
<span id="L26" class="LineNr"> 26 </span><span class="Comment">//: +label: fact 1: 34 # 'run' should have deduced this fact</span>
<span id="L27" class="LineNr"> 27 </span><span class="Comment">//: -label: fact 1: 35 # the trace should not contain such a fact</span>
<span id="L28" class="LineNr"> 28 </span><span class="Comment">//:</span>
<span id="L29" class="LineNr"> 29 </span><span class="Comment">//: Since we never call anything but the run() function directly, we never have</span>
<span id="L30" class="LineNr"> 30 </span><span class="Comment">//: to rewrite the tests when we reorganize the internals of the program. We</span>
<span id="L31" class="LineNr"> 31 </span><span class="Comment">//: just have to make sure our rewrite deduces the same facts about the domain,</span>
<span id="L32" class="LineNr"> 32 </span><span class="Comment">//: and that's something we're going to have to do anyway.</span>
<span id="L33" class="LineNr"> 33 </span><span class="Comment">//:</span>
<span id="L34" class="LineNr"> 34 </span><span class="Comment">//: To avoid the combinatorial explosion of integration tests, each layer</span>
<span id="L35" class="LineNr"> 35 </span><span class="Comment">//: mainly logs facts to the trace with a common *label*. All tests in a layer</span>
<span id="L36" class="LineNr"> 36 </span><span class="Comment">//: tend to check facts with this label. Validating the facts logged with a</span>
<span id="L37" class="LineNr"> 37 </span><span class="Comment">//: specific label is like calling functions of that layer directly.</span>
<span id="L38" class="LineNr"> 38 </span><span class="Comment">//:</span>
<span id="L39" class="LineNr"> 39 </span><span class="Comment">//: To build robust tests, trace facts about your domain rather than details of</span>
<span id="L40" class="LineNr"> 40 </span><span class="Comment">//: how you computed them.</span>
<span id="L41" class="LineNr"> 41 </span><span class="Comment">//:</span>
<span id="L42" class="LineNr"> 42 </span><span class="Comment">//: More details: <a href="http://akkartik.name/blog/tracing-tests">http://akkartik.name/blog/tracing-tests</a></span>
<span id="L43" class="LineNr"> 43 </span><span class="Comment">//:</span>
<span id="L44" class="LineNr"> 44 </span><span class="Comment">//: ---</span>
<span id="L45" class="LineNr"> 45 </span><span class="Comment">//:</span>
<span id="L46" class="LineNr"> 46 </span><span class="Comment">//: Between layers and domain-driven testing, programming starts to look like a</span>
<span id="L47" class="LineNr"> 47 </span><span class="Comment">//: fundamentally different activity. Instead of a) superficial, b) local rules</span>
<span id="L48" class="LineNr"> 48 </span><span class="Comment">//: on c) code [like say <a href="http://blog.bbv.ch/2013/06/05/clean-code-cheat-sheet">http://blog.bbv.ch/2013/06/05/clean-code-cheat-sheet</a>],</span>
<span id="L49" class="LineNr"> 49 </span><span class="Comment">//: we allow programmers to engage with the a) deep, b) global structure of the</span>
<span id="L50" class="LineNr"> 50 </span><span class="Comment">//: c) domain. If you can systematically track discontinuities in the domain,</span>
<span id="L51" class="LineNr"> 51 </span><span class="Comment">//: you don't care if the code used gotos as long as it passed the tests. If</span>
<span id="L52" class="LineNr"> 52 </span><span class="Comment">//: tests become more robust to run it becomes easier to try out radically</span>
<span id="L53" class="LineNr"> 53 </span><span class="Comment">//: different implementations for the same program. If code is super-easy to</span>
<span id="L54" class="LineNr"> 54 </span><span class="Comment">//: rewrite, it becomes less important what indentation style it uses, or that</span>
<span id="L55" class="LineNr"> 55 </span><span class="Comment">//: the objects are appropriately encapsulated, or that the functions are</span>
<span id="L56" class="LineNr"> 56 </span><span class="Comment">//: referentially transparent.</span>
<span id="L57" class="LineNr"> 57 </span><span class="Comment">//:</span>
<span id="L58" class="LineNr"> 58 </span><span class="Comment">//: Instead of plumbing, programming becomes building and gradually refining a</span>
<span id="L59" class="LineNr"> 59 </span><span class="Comment">//: map of the environment the program must operate under. Whether a program is</span>
<span id="L60" class="LineNr"> 60 </span><span class="Comment">//: 'correct' at a given point in time is a red herring; what matters is</span>
<span id="L61" class="LineNr"> 61 </span><span class="Comment">//: avoiding regression by monotonically nailing down the more 'eventful' parts</span>
<span id="L62" class="LineNr"> 62 </span><span class="Comment">//: of the terrain. It helps readers new and old, and rewards curiosity, to</span>
<span id="L63" class="LineNr"> 63 </span><span class="Comment">//: organize large programs in self-similar hierarchies of example scenarios</span>
<span id="L64" class="LineNr"> 64 </span><span class="Comment">//: colocated with the code that makes them work.</span>
<span id="L65" class="LineNr"> 65 </span><span class="Comment">//:</span>
<span id="L66" class="LineNr"> 66 </span><span class="Comment">//: &quot;Programming properly should be regarded as an activity by which</span>
<span id="L67" class="LineNr"> 67 </span><span class="Comment">//: programmers form a mental model, rather than as production of a program.&quot;</span>
<span id="L68" class="LineNr"> 68 </span><span class="Comment">//: -- Peter Naur (<a href="http://alistair.cockburn.us/ASD+book+extract%3A+%22Naur,+Ehn,+Musashi%22">http://alistair.cockburn.us/ASD+book+extract%3A+%22Naur,+Ehn,+Musashi%22</a>)</span>
<span id="L69" class="LineNr"> 69 </span>
<span id="L70" class="LineNr"> 70 </span><span class="Delimiter">:(before &quot;End Types&quot;)</span>
<span id="L71" class="LineNr"> 71 </span><span class="Normal">struct</span> trace_line <span class="Delimiter">{</span>
<span id="L72" class="LineNr"> 72 </span> <span class="Normal">int</span> depth<span class="Delimiter">;</span> <span class="Comment">// optional field just to help browse traces later</span>
<span id="L73" class="LineNr"> 73 </span> string label<span class="Delimiter">;</span>
<span id="L74" class="LineNr"> 74 </span> string contents<span class="Delimiter">;</span>
<span id="L75" class="LineNr"> 75 </span> trace_line<span class="Delimiter">(</span>string l<span class="Delimiter">,</span> string c<span class="Delimiter">)</span> :depth<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">),</span> label<span class="Delimiter">(</span>l<span class="Delimiter">),</span> contents<span class="Delimiter">(</span>c<span class="Delimiter">)</span> <span class="Delimiter">{}</span>
<span id="L76" class="LineNr"> 76 </span> trace_line<span class="Delimiter">(</span><span class="Normal">int</span> d<span class="Delimiter">,</span> string l<span class="Delimiter">,</span> string c<span class="Delimiter">)</span> :depth<span class="Delimiter">(</span>d<span class="Delimiter">),</span> label<span class="Delimiter">(</span>l<span class="Delimiter">),</span> contents<span class="Delimiter">(</span>c<span class="Delimiter">)</span> <span class="Delimiter">{}</span>
<span id="L77" class="LineNr"> 77 </span><span class="Delimiter">};</span>
<span id="L78" class="LineNr"> 78 </span>
<span id="L79" class="LineNr"> 79 </span><span class="Comment">//: Support for tracing an entire run.</span>
<span id="L80" class="LineNr"> 80 </span><span class="Comment">//: Traces can have a lot of overhead, so only turn them on when asked.</span>
<span id="L81" class="LineNr"> 81 </span><span class="Delimiter">:(before &quot;End Commandline Options(*arg)&quot;)</span>
<span id="L82" class="LineNr"> 82 </span><span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L73'>is_equal</a><span class="Delimiter">(</span>*arg<span class="Delimiter">,</span> <span class="Constant">&quot;--trace&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L83" class="LineNr"> 83 </span> <span class="Special">Save_trace</span> =<span class="Constant"> true</span><span class="Delimiter">;</span>
<span id="L84" class="LineNr"> 84 </span><span class="Delimiter">}</span>
<span id="L85" class="LineNr"> 85 </span><span class="Delimiter">:(before &quot;End Commandline Parsing&quot;)</span>
<span id="L86" class="LineNr"> 86 </span><span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special">Save_trace</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L87" class="LineNr"> 87 </span> cerr &lt;&lt; <span class="Constant">&quot;initializing trace\n&quot;</span><span class="Delimiter">;</span>
<span id="L88" class="LineNr"> 88 </span> <span class="Special">Trace_stream</span> = <span class="Normal">new</span> trace_stream<span class="Delimiter">;</span>
<span id="L89" class="LineNr"> 89 </span><span class="Delimiter">}</span>
<span id="L90" class="LineNr"> 90 </span><span class="Delimiter">:(code)</span>
<span id="L91" class="LineNr"> 91 </span><span class="Normal">void</span> <a href='003trace.cc.html#L91'>cleanup_main</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L92" class="LineNr"> 92 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!<span class="Special">Trace_stream</span><span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L93" class="LineNr"> 93 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special">Save_trace</span><span class="Delimiter">)</span>
<span id="L94" class="LineNr"> 94 </span> <span class="Special">Trace_stream</span><span class="Delimiter">-&gt;</span><a href='003trace.cc.html#L133'>save</a><span class="Delimiter">();</span>
<span id="L95" class="LineNr"> 95 </span> <span class="Normal">delete</span> <span class="Special">Trace_stream</span><span class="Delimiter">;</span>
<span id="L96" class="LineNr"> 96 </span> <span class="Special">Trace_stream</span> = <span class="Constant">NULL</span><span class="Delimiter">;</span>
<span id="L97" class="LineNr"> 97 </span><span class="Delimiter">}</span>
<span id="L98" class="LineNr"> 98 </span><span class="Delimiter">:(before &quot;End One-time Setup&quot;)</span>
<span id="L99" class="LineNr"> 99 </span>atexit<span class="Delimiter">(</span><a href='003trace.cc.html#L91'>cleanup_main</a><span class="Delimiter">);</span>
<span id="L100" class="LineNr">100 </span>
<span id="L101" class="LineNr">101 </span><span class="Delimiter">:(before &quot;End Types&quot;)</span>
<span id="L102" class="LineNr">102 </span><span class="Comment">// Pre-define some global constants that trace_stream needs to know about.</span>
<span id="L103" class="LineNr">103 </span><span class="Comment">// Since they're in the Types section, they'll be included in any cleaved</span>
<span id="L104" class="LineNr">104 </span><span class="Comment">// compilation units. So no extern linkage.</span>
<span id="L105" class="LineNr">105 </span><span class="Normal">const</span> <span class="Normal">int</span> <span class="Special">Max_depth</span> = <span class="Constant">9999</span><span class="Delimiter">;</span>
<span id="L106" class="LineNr">106 </span><span class="Normal">const</span> <span class="Normal">int</span> <span class="Special">Error_depth</span> = <span class="Constant">0</span><span class="Delimiter">;</span> <span class="Comment">// definitely always print errors</span>
<span id="L107" class="LineNr">107 </span><span class="Normal">const</span> <span class="Normal">int</span> <span class="Special">App_depth</span> = <span class="Constant">2</span><span class="Delimiter">;</span> <span class="Comment">// temporarily where all Mu code will trace to</span>
<span id="L108" class="LineNr">108 </span>
<span id="L109" class="LineNr">109 </span><span class="Normal">struct</span> trace_stream <span class="Delimiter">{</span>
<span id="L110" class="LineNr">110 </span> vector&lt;trace_line&gt; past_lines<span class="Delimiter">;</span>
<span id="L111" class="LineNr">111 </span> <span class="Comment">// accumulator for current line</span>
<span id="L112" class="LineNr">112 </span> ostringstream* curr_stream<span class="Delimiter">;</span>
<span id="L113" class="LineNr">113 </span> string curr_label<span class="Delimiter">;</span>
<span id="L114" class="LineNr">114 </span> <span class="Normal">int</span> curr_depth<span class="Delimiter">;</span>
<span id="L115" class="LineNr">115 </span> <span class="Normal">int</span> callstack_depth<span class="Delimiter">;</span>
<span id="L116" class="LineNr">116 </span> <span class="Normal">int</span> collect_depth<span class="Delimiter">;</span>
<span id="L117" class="LineNr">117 </span> ofstream<span class="Constant"> null</span>_stream<span class="Delimiter">;</span> <span class="Comment">// never opens a file, so writes silently fail</span>
<span id="L118" class="LineNr">118 </span> trace_stream<span class="Delimiter">()</span> :curr_stream<span class="Delimiter">(</span><span class="Constant">NULL</span><span class="Delimiter">),</span> curr_depth<span class="Delimiter">(</span><span class="Special">Max_depth</span><span class="Delimiter">),</span> callstack_depth<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">),</span> collect_depth<span class="Delimiter">(</span><span class="Special">Max_depth</span><span class="Delimiter">)</span> <span class="Delimiter">{}</span>
<span id="L119" class="LineNr">119 </span> <a href='003trace.cc.html#L119'>~trace_stream</a><span class="Delimiter">()</span> <span class="Delimiter">{</span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr_stream<span class="Delimiter">)</span> <span class="Normal">delete</span> curr_stream<span class="Delimiter">;</span> <span class="Delimiter">}</span>
<span id="L120" class="LineNr">120 </span>
<span id="L121" class="LineNr">121 </span> ostream&amp; stream<span class="Delimiter">(</span>string label<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L122" class="LineNr">122 </span> <span class="Identifier">return</span> stream<span class="Delimiter">(</span><span class="Special">Max_depth</span><span class="Delimiter">,</span> label<span class="Delimiter">);</span>
<span id="L123" class="LineNr">123 </span> <span class="Delimiter">}</span>
<span id="L124" class="LineNr">124 </span>
<span id="L125" class="LineNr">125 </span> ostream&amp; stream<span class="Delimiter">(</span><span class="Normal">int</span> depth<span class="Delimiter">,</span> string label<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L126" class="LineNr">126 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>depth &gt; collect_depth<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Constant"> null</span>_stream<span class="Delimiter">;</span>
<span id="L127" class="LineNr">127 </span> curr_stream = <span class="Normal">new</span> ostringstream<span class="Delimiter">;</span>
<span id="L128" class="LineNr">128 </span> curr_label = label<span class="Delimiter">;</span>
<span id="L129" class="LineNr">129 </span> curr_depth = depth<span class="Delimiter">;</span>
<span id="L130" class="LineNr">130 </span> <span class="Identifier">return</span> *curr_stream<span class="Delimiter">;</span>
<span id="L131" class="LineNr">131 </span> <span class="Delimiter">}</span>
<span id="L132" class="LineNr">132 </span>
<span id="L133" class="LineNr">133 </span> <span class="Normal">void</span> <a href='003trace.cc.html#L133'>save</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L134" class="LineNr">134 </span> cerr &lt;&lt; <span class="Constant">&quot;saving <a href='003trace.cc.html#L189'>trace</a> to 'last_run'\n&quot;</span><span class="Delimiter">;</span>
<span id="L135" class="LineNr">135 </span> ofstream fout<span class="Delimiter">(</span><span class="Constant">&quot;last_run&quot;</span><span class="Delimiter">);</span>
<span id="L136" class="LineNr">136 </span> fout &lt;&lt; <a href='003trace.cc.html#L163'>readable_contents</a><span class="Delimiter">(</span><span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
<span id="L137" class="LineNr">137 </span> fout<span class="Delimiter">.</span>close<span class="Delimiter">();</span>
<span id="L138" class="LineNr">138 </span> <span class="Delimiter">}</span>
<span id="L139" class="LineNr">139 </span>
<span id="L140" class="LineNr">140 </span> <span class="Comment">// be sure to call this before messing with curr_stream or curr_label</span>
<span id="L141" class="LineNr">141 </span> <span class="Normal">void</span> <a href='003trace.cc.html#L147'>newline</a><span class="Delimiter">();</span>
<span id="L142" class="LineNr">142 </span> <span class="Comment">// useful for debugging</span>
<span id="L143" class="LineNr">143 </span> string <a href='003trace.cc.html#L163'>readable_contents</a><span class="Delimiter">(</span>string label<span class="Delimiter">);</span> <span class="Comment">// empty label = show everything</span>
<span id="L144" class="LineNr">144 </span><span class="Delimiter">};</span>
<span id="L145" class="LineNr">145 </span>
<span id="L146" class="LineNr">146 </span><span class="Delimiter">:(code)</span>
<span id="L147" class="LineNr">147 </span><span class="Normal">void</span> trace_stream::<a href='003trace.cc.html#L147'>newline</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L148" class="LineNr">148 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!curr_stream<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L149" class="LineNr">149 </span> string curr_contents = curr_stream<span class="Delimiter">-&gt;</span>str<span class="Delimiter">();</span>
<span id="L150" class="LineNr">150 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!curr_contents<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span id="L151" class="LineNr">151 </span> past_lines<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>trace_line<span class="Delimiter">(</span>curr_depth<span class="Delimiter">,</span> <a href='003trace.cc.html#L394'>trim</a><span class="Delimiter">(</span>curr_label<span class="Delimiter">),</span> curr_contents<span class="Delimiter">));</span> <span class="Comment">// preserve indent in contents</span>
<span id="L152" class="LineNr">152 </span> <span class="Normal">if</span> <span class="Delimiter">((</span>!<span class="Special">Hide_errors</span> &amp;&amp; curr_label == <span class="Constant">&quot;error&quot;</span><span class="Delimiter">)</span>
<span id="L153" class="LineNr">153 </span> || <span class="Special">Dump_trace</span>
<span id="L154" class="LineNr">154 </span> || <span class="Delimiter">(</span>!<span class="Special">Dump_label</span><span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; curr_label == <span class="Special">Dump_label</span><span class="Delimiter">))</span>
<span id="L155" class="LineNr">155 </span> cerr &lt;&lt; curr_label &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; curr_contents &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L156" class="LineNr">156 </span> <span class="Delimiter">}</span>
<span id="L157" class="LineNr">157 </span> <span class="Normal">delete</span> curr_stream<span class="Delimiter">;</span>
<span id="L158" class="LineNr">158 </span> curr_stream = <span class="Constant">NULL</span><span class="Delimiter">;</span>
<span id="L159" class="LineNr">159 </span> curr_label<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
<span id="L160" class="LineNr">160 </span> curr_depth = <span class="Special">Max_depth</span><span class="Delimiter">;</span>
<span id="L161" class="LineNr">161 </span><span class="Delimiter">}</span>
<span id="L162" class="LineNr">162 </span>
<span id="L163" class="LineNr">163 </span>string trace_stream::<a href='003trace.cc.html#L163'>readable_contents</a><span class="Delimiter">(</span>string label<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L164" class="LineNr">164 </span> ostringstream output<span class="Delimiter">;</span>
<span id="L165" class="LineNr">165 </span> label = <a href='003trace.cc.html#L394'>trim</a><span class="Delimiter">(</span>label<span class="Delimiter">);</span>
<span id="L166" class="LineNr">166 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>vector&lt;trace_line&gt;::iterator p = past_lines<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != past_lines<span class="Delimiter">.</span><a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span> ++p<span class="Delimiter">)</span>
<span id="L167" class="LineNr">167 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>label<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> || label == p<span class="Delimiter">-&gt;</span>label<span class="Delimiter">)</span>
<span id="L168" class="LineNr">168 </span> output &lt;&lt; std::setw<span class="Delimiter">(</span><span class="Constant">4</span><span class="Delimiter">)</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>depth &lt;&lt; <span class="Constant">' '</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>label &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>contents &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L169" class="LineNr">169 </span> <span class="Identifier">return</span> output<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span id="L170" class="LineNr">170 </span><span class="Delimiter">}</span>
<span id="L171" class="LineNr">171 </span>
<span id="L172" class="LineNr">172 </span><span class="Delimiter">:(before &quot;End Globals&quot;)</span>
<span id="L173" class="LineNr">173 </span>trace_stream* <span class="Special">Trace_stream</span> = <span class="Constant">NULL</span><span class="Delimiter">;</span>
<span id="L174" class="LineNr">174 </span><span class="Normal">int</span> <span class="Special">Trace_errors</span> = <span class="Constant">0</span><span class="Delimiter">;</span> <span class="Comment">// used only when Trace_stream is NULL</span>
<span id="L175" class="LineNr">175 </span>
<span id="L176" class="LineNr">176 </span><span class="Delimiter">:(before &quot;End Globals&quot;)</span>
<span id="L177" class="LineNr">177 </span><span class="Normal">bool</span> <span class="Special">Hide_errors</span> =<span class="Constant"> false</span><span class="Delimiter">;</span> <span class="Comment">// if set, don't print even error trace lines to screen</span>
<span id="L178" class="LineNr">178 </span><span class="Normal">bool</span> <span class="Special">Dump_trace</span> =<span class="Constant"> false</span><span class="Delimiter">;</span> <span class="Comment">// if set, print trace lines to screen</span>
<span id="L179" class="LineNr">179 </span>string <span class="Special">Dump_label</span> = <span class="Constant">&quot;&quot;</span><span class="Delimiter">;</span> <span class="Comment">// if set, print trace lines matching a single label to screen</span>
<span id="L180" class="LineNr">180 </span><span class="Delimiter">:(before &quot;End Reset&quot;)</span>
<span id="L181" class="LineNr">181 </span><span class="Special">Hide_errors</span> =<span class="Constant"> false</span><span class="Delimiter">;</span>
<span id="L182" class="LineNr">182 </span><span class="Special">Dump_trace</span> =<span class="Constant"> false</span><span class="Delimiter">;</span> <span class="Comment">// toggle this to print traces to screen as they are emitted</span>
<span id="L183" class="LineNr">183 </span><span class="Special">Dump_label</span> = <span class="Constant">&quot;&quot;</span><span class="Delimiter">;</span>
<span id="L184" class="LineNr">184 </span>
<span id="L185" class="LineNr">185 </span><span class="Delimiter">:(before &quot;End Includes&quot;)</span>
<span id="L186" class="LineNr">186 </span><span class="Comment">#define CLEAR_TRACE delete Trace_stream, Trace_stream = new trace_stream;</span>
<span id="L187" class="LineNr">187 </span>
<span id="L188" class="LineNr">188 </span><span class="Comment">// Top-level helper. IMPORTANT: can't nest</span>
<span id="L189" class="LineNr">189 </span><span class="Comment">#define trace(...) !Trace_stream ? cerr /*print nothing*/ : Trace_stream-&gt;stream(__VA_ARGS__)</span>
<span id="L190" class="LineNr">190 </span>
<span id="L191" class="LineNr">191 </span><span class="Comment">// Just for debugging; 'git log' should never show any calls to 'dbg'.</span>
<span id="L192" class="LineNr">192 </span><span class="Comment">#define dbg trace(0, &quot;a&quot;)</span>
<span id="L193" class="LineNr">193 </span><span class="Comment">#define DUMP(label) if (Trace_stream) cerr &lt;&lt; Trace_stream-&gt;readable_contents(label);</span>
<span id="L194" class="LineNr">194 </span>
<span id="L195" class="LineNr">195 </span><span class="Comment">// Errors are a special layer.</span>
<span id="L196" class="LineNr">196 </span><span class="Comment">#define raise (!Trace_stream ? (scroll_to_bottom_and_close_console(),++Trace_errors,cerr) /*do print*/ : Trace_stream-&gt;stream(Error_depth, &quot;error&quot;))</span>
<span id="L197" class="LineNr">197 </span><span class="Comment">// If we aren't yet sure how to deal with some corner case, use assert_for_now</span>
<span id="L198" class="LineNr">198 </span><span class="Comment">// to indicate that it isn't an inviolable invariant.</span>
<span id="L199" class="LineNr">199 </span><span class="Comment">#define assert_for_now assert</span>
<span id="L200" class="LineNr">200 </span>
<span id="L201" class="LineNr">201 </span><span class="Comment">//: Automatically close the console in some situations.</span>
<span id="L202" class="LineNr">202 </span><span class="Delimiter">:(before &quot;End One-time Setup&quot;)</span>
<span id="L203" class="LineNr">203 </span>atexit<span class="Delimiter">(</span><a href='003trace.cc.html#L205'>scroll_to_bottom_and_close_console</a><span class="Delimiter">);</span>
<span id="L204" class="LineNr">204 </span><span class="Delimiter">:(code)</span>
<span id="L205" class="LineNr">205 </span><span class="Normal">void</span> <a href='003trace.cc.html#L205'>scroll_to_bottom_and_close_console</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L206" class="LineNr">206 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!tb_is_active<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L207" class="LineNr">207 </span> <span class="Comment">// leave the screen in a relatively clean state</span>
<span id="L208" class="LineNr">208 </span> tb_set_cursor<span class="Delimiter">(</span>tb_width<span class="Delimiter">()</span>-<span class="Constant">1</span><span class="Delimiter">,</span> tb_height<span class="Delimiter">()</span>-<span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L209" class="LineNr">209 </span> cout &lt;&lt; <span class="Constant">&quot;\r\n&quot;</span><span class="Delimiter">;</span>
<span id="L210" class="LineNr">210 </span> tb_shutdown<span class="Delimiter">();</span>
<span id="L211" class="LineNr">211 </span><span class="Delimiter">}</span>
<span id="L212" class="LineNr">212 </span>
<span id="L213" class="LineNr">213 </span><span class="Comment">// Inside tests, fail any tests that displayed (unexpected) errors.</span>
<span id="L214" class="LineNr">214 </span><span class="Comment">// Expected errors in tests should always be hidden and silently checked for.</span>
<span id="L215" class="LineNr">215 </span><span class="Delimiter">:(before &quot;End Test Teardown&quot;)</span>
<span id="L216" class="LineNr">216 </span><span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special">Passed</span> &amp;&amp; !<span class="Special">Hide_errors</span> &amp;&amp; <a href='003trace.cc.html#L220'>trace_contains_errors</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span id="L217" class="LineNr">217 </span> <span class="Special">Passed</span> =<span class="Constant"> false</span><span class="Delimiter">;</span>
<span id="L218" class="LineNr">218 </span><span class="Delimiter">}</span>
<span id="L219" class="LineNr">219 </span><span class="Delimiter">:(code)</span>
<span id="L220" class="LineNr">220 </span><span class="Normal">bool</span> <a href='003trace.cc.html#L220'>trace_contains_errors</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L221" class="LineNr">221 </span> <span class="Identifier">return</span> <span class="Special">Trace_errors</span> &gt; <span class="Constant">0</span> || trace_count<span class="Delimiter">(</span><span class="Constant">&quot;error&quot;</span><span class="Delimiter">)</span> &gt; <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L222" class="LineNr">222 </span><span class="Delimiter">}</span>
<span id="L223" class="LineNr">223 </span>
<span id="L224" class="LineNr">224 </span><span class="Delimiter">:(before &quot;End Types&quot;)</span>
<span id="L225" class="LineNr">225 </span><span class="Normal">struct</span> <a href='003trace.cc.html#L225'>end</a> <span class="Delimiter">{};</span>
<span id="L226" class="LineNr">226 </span><span class="Delimiter">:(code)</span>
<span id="L227" class="LineNr">227 </span>ostream&amp; <span class="Normal">operator</span>&lt;&lt;<span class="Delimiter">(</span>ostream&amp; os<span class="Delimiter">,</span> <a href='003trace.cc.html#L225'>end</a> <span class="Comment">/*</span><span class="Comment">unused</span><span class="Comment">*/</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L228" class="LineNr">228 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special">Trace_stream</span><span class="Delimiter">)</span> <span class="Special">Trace_stream</span><span class="Delimiter">-&gt;</span><a href='003trace.cc.html#L147'>newline</a><span class="Delimiter">();</span>
<span id="L229" class="LineNr">229 </span> <span class="Identifier">return</span> os<span class="Delimiter">;</span>
<span id="L230" class="LineNr">230 </span><span class="Delimiter">}</span>
<span id="L231" class="LineNr">231 </span>
<span id="L232" class="LineNr">232 </span><span class="Delimiter">:(before &quot;End Globals&quot;)</span>
<span id="L233" class="LineNr">233 </span><span class="Normal">bool</span> <span class="Special">Save_trace</span> =<span class="Constant"> false</span><span class="Delimiter">;</span> <span class="Comment">// if set, write out trace to disk</span>
<span id="L234" class="LineNr">234 </span>
<span id="L235" class="LineNr">235 </span><span class="Comment">// Trace_stream is a resource, lease_tracer uses RAII to manage it.</span>
<span id="L236" class="LineNr">236 </span><span class="Delimiter">:(before &quot;End Types&quot;)</span>
<span id="L237" class="LineNr">237 </span><span class="Normal">struct</span> lease_tracer <span class="Delimiter">{</span>
<span id="L238" class="LineNr">238 </span> lease_tracer<span class="Delimiter">();</span>
<span id="L239" class="LineNr">239 </span> <a href='003trace.cc.html#L243'>~lease_tracer</a><span class="Delimiter">();</span>
<span id="L240" class="LineNr">240 </span><span class="Delimiter">};</span>
<span id="L241" class="LineNr">241 </span><span class="Delimiter">:(code)</span>
<span id="L242" class="LineNr">242 </span>lease_tracer::lease_tracer<span class="Delimiter">()</span> <span class="Delimiter">{</span> <span class="Special">Trace_stream</span> = <span class="Normal">new</span> trace_stream<span class="Delimiter">;</span> <span class="Delimiter">}</span>
<span id="L243" class="LineNr">243 </span>lease_tracer::<a href='003trace.cc.html#L243'>~lease_tracer</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L244" class="LineNr">244 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special">Save_trace</span><span class="Delimiter">)</span> <span class="Special">Trace_stream</span><span class="Delimiter">-&gt;</span><a href='003trace.cc.html#L133'>save</a><span class="Delimiter">();</span>
<span id="L245" class="LineNr">245 </span> <span class="Normal">delete</span> <span class="Special">Trace_stream</span><span class="Delimiter">,</span> <span class="Special">Trace_stream</span> = <span class="Constant">NULL</span><span class="Delimiter">;</span>
<span id="L246" class="LineNr">246 </span><span class="Delimiter">}</span>
<span id="L247" class="LineNr">247 </span><span class="Delimiter">:(before &quot;End Includes&quot;)</span>
<span id="L248" class="LineNr">248 </span><span class="Comment">#define START_TRACING_UNTIL_END_OF_SCOPE lease_tracer leased_tracer;</span>
<span id="L249" class="LineNr">249 </span><span class="Delimiter">:(before &quot;End Test Setup&quot;)</span>
<span id="L250" class="LineNr">250 </span><a href='003trace.cc.html#L248'>START_TRACING_UNTIL_END_OF_SCOPE</a>
<span id="L251" class="LineNr">251 </span>
<span id="L252" class="LineNr">252 </span><span class="Delimiter">:(before &quot;End Includes&quot;)</span>
<span id="L253" class="LineNr">253 </span><span class="Comment">#define CHECK_TRACE_CONTENTS(...) check_trace_contents(__FUNCTION__, __FILE__, __LINE__, __VA_ARGS__)</span>
<span id="L254" class="LineNr">254 </span>
<span id="L255" class="LineNr">255 </span><span class="Comment">#define CHECK_TRACE_CONTAINS_ERRORS() CHECK(trace_contains_errors())</span>
<span id="L256" class="LineNr">256 </span><span class="Comment">#define CHECK_TRACE_DOESNT_CONTAIN_ERRORS() \</span>
<span id="L257" class="LineNr">257 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special">Passed</span> &amp;&amp; <a href='003trace.cc.html#L220'>trace_contains_errors</a><span class="Delimiter">())</span> <span class="Delimiter">{</span> \
<span id="L258" class="LineNr">258 </span> cerr &lt;&lt; <span class="Constant">&quot;\nF - &quot;</span> &lt;&lt; __FUNCTION__ &lt;&lt; <span class="Constant">&quot;(&quot;</span> &lt;&lt; <span class="Constant">__FILE__</span> &lt;&lt; <span class="Constant">&quot;:&quot;</span> &lt;&lt; <span class="Constant">__LINE__</span> &lt;&lt; <span class="Constant">&quot;): unexpected errors\n&quot;</span><span class="Delimiter">;</span> \
<span id="L259" class="LineNr">259 </span> <a href='003trace.cc.html#L193'>DUMP</a><span class="Delimiter">(</span><span class="Constant">&quot;error&quot;</span><span class="Delimiter">);</span> \
<span id="L260" class="LineNr">260 </span> <span class="Special">Passed</span> =<span class="Constant"> false</span><span class="Delimiter">;</span> \
<span id="L261" class="LineNr">261 </span> <span class="Identifier">return</span><span class="Delimiter">;</span> \
<span id="L262" class="LineNr">262 </span> <span class="Delimiter">}</span>
<span id="L263" class="LineNr">263 </span>
<span id="L264" class="LineNr">264 </span><span class="Comment">#define CHECK_TRACE_COUNT(label, count) \</span>
<span id="L265" class="LineNr">265 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special">Passed</span> &amp;&amp; trace_count<span class="Delimiter">(</span>label<span class="Delimiter">)</span> != <span class="Delimiter">(</span>count<span class="Delimiter">))</span> <span class="Delimiter">{</span> \
<span id="L266" class="LineNr">266 </span> cerr &lt;&lt; <span class="Constant">&quot;\nF - &quot;</span> &lt;&lt; __FUNCTION__ &lt;&lt; <span class="Constant">&quot;(&quot;</span> &lt;&lt; <span class="Constant">__FILE__</span> &lt;&lt; <span class="Constant">&quot;:&quot;</span> &lt;&lt; <span class="Constant">__LINE__</span> &lt;&lt; <span class="Constant">&quot;): trace_count of &quot;</span> &lt;&lt; label &lt;&lt; <span class="Constant">&quot; should be &quot;</span> &lt;&lt; count &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span> \
<span id="L267" class="LineNr">267 </span> cerr &lt;&lt; <span class="Constant">&quot; got &quot;</span> &lt;&lt; trace_count<span class="Delimiter">(</span>label<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span> <span class="Comment">/*</span><span class="Comment"> multiple eval </span><span class="Comment">*/</span> \
<span id="L268" class="LineNr">268 </span> <a href='003trace.cc.html#L193'>DUMP</a><span class="Delimiter">(</span>label<span class="Delimiter">);</span> \
<span id="L269" class="LineNr">269 </span> <span class="Special">Passed</span> =<span class="Constant"> false</span><span class="Delimiter">;</span> \
<span id="L270" class="LineNr">270 </span> <span class="Identifier">return</span><span class="Delimiter">;</span> <span class="Comment">/*</span><span class="Comment"> Currently we stop at the very first failure. </span><span class="Comment">*/</span> \
<span id="L271" class="LineNr">271 </span> <span class="Delimiter">}</span>
<span id="L272" class="LineNr">272 </span>
<span id="L273" class="LineNr">273 </span><span class="Comment">#define CHECK_TRACE_DOESNT_CONTAIN(...) CHECK(trace_doesnt_contain(__VA_ARGS__))</span>
<span id="L274" class="LineNr">274 </span>
<span id="L275" class="LineNr">275 </span><span class="Delimiter">:(code)</span>
<span id="L276" class="LineNr">276 </span><span class="Normal">bool</span> <a href='003trace.cc.html#L276'>check_trace_contents</a><span class="Delimiter">(</span>string FUNCTION<span class="Delimiter">,</span> string <span class="Normal">FILE</span><span class="Delimiter">,</span> <span class="Normal">int</span> LINE<span class="Delimiter">,</span> string expected<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L277" class="LineNr">277 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!<span class="Special">Passed</span><span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Constant"> false</span><span class="Delimiter">;</span>
<span id="L278" class="LineNr">278 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!<span class="Special">Trace_stream</span><span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Constant"> false</span><span class="Delimiter">;</span>
<span id="L279" class="LineNr">279 </span> vector&lt;string&gt; expected_lines = <a href='003trace.cc.html#L370'>split</a><span class="Delimiter">(</span>expected<span class="Delimiter">,</span> <span class="Constant">&quot;^D&quot;</span><span class="Delimiter">);</span>
<span id="L280" class="LineNr">280 </span> <span class="Normal">int</span> curr_expected_line = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L281" class="LineNr">281 </span> <span class="Normal">while</span> <span class="Delimiter">(</span>curr_expected_line &lt; <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>expected_lines<span class="Delimiter">)</span> &amp;&amp; expected_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>curr_expected_line<span class="Delimiter">).</span>empty<span class="Delimiter">())</span>
<span id="L282" class="LineNr">282 </span> ++curr_expected_line<span class="Delimiter">;</span>
<span id="L283" class="LineNr">283 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr_expected_line == <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>expected_lines<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Constant"> true</span><span class="Delimiter">;</span>
<span id="L284" class="LineNr">284 </span> string label<span class="Delimiter">,</span> contents<span class="Delimiter">;</span>
<span id="L285" class="LineNr">285 </span> <a href='003trace.cc.html#L308'>split_label_contents</a><span class="Delimiter">(</span>expected_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>curr_expected_line<span class="Delimiter">),</span> &amp;label<span class="Delimiter">,</span> &amp;contents<span class="Delimiter">);</span>
<span id="L286" class="LineNr">286 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>vector&lt;trace_line&gt;::iterator p = <span class="Special">Trace_stream</span><span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != <span class="Special">Trace_stream</span><span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span><a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L287" class="LineNr">287 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>label != p<span class="Delimiter">-&gt;</span>label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span id="L288" class="LineNr">288 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>contents != <a href='003trace.cc.html#L394'>trim</a><span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>contents<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span id="L289" class="LineNr">289 </span> ++curr_expected_line<span class="Delimiter">;</span>
<span id="L290" class="LineNr">290 </span> <span class="Normal">while</span> <span class="Delimiter">(</span>curr_expected_line &lt; <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>expected_lines<span class="Delimiter">)</span> &amp;&amp; expected_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>curr_expected_line<span class="Delimiter">).</span>empty<span class="Delimiter">())</span>
<span id="L291" class="LineNr">291 </span> ++curr_expected_line<span class="Delimiter">;</span>
<span id="L292" class="LineNr">292 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr_expected_line == <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>expected_lines<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Constant"> true</span><span class="Delimiter">;</span>
<span id="L293" class="LineNr">293 </span> <a href='003trace.cc.html#L308'>split_label_contents</a><span class="Delimiter">(</span>expected_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>curr_expected_line<span class="Delimiter">),</span> &amp;label<span class="Delimiter">,</span> &amp;contents<span class="Delimiter">);</span>
<span id="L294" class="LineNr">294 </span> <span class="Delimiter">}</span>
<span id="L295" class="LineNr">295 </span>
<span id="L296" class="LineNr">296 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L321'>line_exists_anywhere</a><span class="Delimiter">(</span>label<span class="Delimiter">,</span> contents<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L297" class="LineNr">297 </span> cerr &lt;&lt; <span class="Constant">&quot;\nF - &quot;</span> &lt;&lt; FUNCTION &lt;&lt; <span class="Constant">&quot;(&quot;</span> &lt;&lt; <span class="Normal">FILE</span> &lt;&lt; <span class="Constant">&quot;:&quot;</span> &lt;&lt; LINE &lt;&lt; <span class="Constant">&quot;): line [&quot;</span> &lt;&lt; label &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; contents &lt;&lt; <span class="Constant">&quot;] out of order in <a href='003trace.cc.html#L189'>trace</a>:\n&quot;</span><span class="Delimiter">;</span>
<span id="L298" class="LineNr">298 </span> <a href='003trace.cc.html#L193'>DUMP</a><span class="Delimiter">(</span><span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
<span id="L299" class="LineNr">299 </span> <span class="Delimiter">}</span>
<span id="L300" class="LineNr">300 </span> <span class="Normal">else</span> <span class="Delimiter">{</span>
<span id="L301" class="LineNr">301 </span> cerr &lt;&lt; <span class="Constant">&quot;\nF - &quot;</span> &lt;&lt; FUNCTION &lt;&lt; <span class="Constant">&quot;(&quot;</span> &lt;&lt; <span class="Normal">FILE</span> &lt;&lt; <span class="Constant">&quot;:&quot;</span> &lt;&lt; LINE &lt;&lt; <span class="Constant">&quot;): missing [&quot;</span> &lt;&lt; contents &lt;&lt; <span class="Constant">&quot;] in <a href='003trace.cc.html#L189'>trace</a>:\n&quot;</span><span class="Delimiter">;</span>
<span id="L302" class="LineNr">302 </span> <a href='003trace.cc.html#L193'>DUMP</a><span class="Delimiter">(</span>label<span class="Delimiter">);</span>
<span id="L303" class="LineNr">303 </span> <span class="Delimiter">}</span>
<span id="L304" class="LineNr">304 </span> <span class="Special">Passed</span> =<span class="Constant"> false</span><span class="Delimiter">;</span>
<span id="L305" class="LineNr">305 </span> <span class="Identifier">return</span><span class="Constant"> false</span><span class="Delimiter">;</span>
<span id="L306" class="LineNr">306 </span><span class="Delimiter">}</span>
<span id="L307" class="LineNr">307 </span>
<span id="L308" class="LineNr">308 </span><span class="Normal">void</span> <a href='003trace.cc.html#L308'>split_label_contents</a><span class="Delimiter">(</span><span class="Normal">const</span> string&amp; s<span class="Delimiter">,</span> string* label<span class="Delimiter">,</span> string* contents<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L309" class="LineNr">309 </span> <span class="Normal">static</span> <span class="Normal">const</span> string delim<span class="Delimiter">(</span><span class="Constant">&quot;: &quot;</span><span class="Delimiter">);</span>
<span id="L310" class="LineNr">310 </span> <span class="Normal">size_t</span> pos = s<span class="Delimiter">.</span>find<span class="Delimiter">(</span>delim<span class="Delimiter">);</span>
<span id="L311" class="LineNr">311 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>pos == string::npos<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L312" class="LineNr">312 </span> *label = <span class="Constant">&quot;&quot;</span><span class="Delimiter">;</span>
<span id="L313" class="LineNr">313 </span> *contents = <a href='003trace.cc.html#L394'>trim</a><span class="Delimiter">(</span>s<span class="Delimiter">);</span>
<span id="L314" class="LineNr">314 </span> <span class="Delimiter">}</span>
<span id="L315" class="LineNr">315 </span> <span class="Normal">else</span> <span class="Delimiter">{</span>
<span id="L316" class="LineNr">316 </span> *label = <a href='003trace.cc.html#L394'>trim</a><span class="Delimiter">(</span>s<span class="Delimiter">.</span>substr<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">,</span> pos<span class="Delimiter">));</span>
<span id="L317" class="LineNr">317 </span> *contents = <a href='003trace.cc.html#L394'>trim</a><span class="Delimiter">(</span>s<span class="Delimiter">.</span>substr<span class="Delimiter">(</span>pos+SIZE<span class="Delimiter">(</span>delim<span class="Delimiter">)));</span>
<span id="L318" class="LineNr">318 </span> <span class="Delimiter">}</span>
<span id="L319" class="LineNr">319 </span><span class="Delimiter">}</span>
<span id="L320" class="LineNr">320 </span>
<span id="L321" class="LineNr">321 </span><span class="Normal">bool</span> <a href='003trace.cc.html#L321'>line_exists_anywhere</a><span class="Delimiter">(</span><span class="Normal">const</span> string&amp; label<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; contents<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L322" class="LineNr">322 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>vector&lt;trace_line&gt;::iterator p = <span class="Special">Trace_stream</span><span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != <span class="Special">Trace_stream</span><span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span><a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L323" class="LineNr">323 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>label != p<span class="Delimiter">-&gt;</span>label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span id="L324" class="LineNr">324 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>contents == <a href='003trace.cc.html#L394'>trim</a><span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>contents<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Constant"> true</span><span class="Delimiter">;</span>
<span id="L325" class="LineNr">325 </span> <span class="Delimiter">}</span>
<span id="L326" class="LineNr">326 </span> <span class="Identifier">return</span><span class="Constant"> false</span><span class="Delimiter">;</span>
<span id="L327" class="LineNr">327 </span><span class="Delimiter">}</span>
<span id="L328" class="LineNr">328 </span>
<span id="L329" class="LineNr">329 </span><span class="Normal">int</span> trace_count<span class="Delimiter">(</span>string label<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L330" class="LineNr">330 </span> <span class="Identifier">return</span> trace_count<span class="Delimiter">(</span>label<span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
<span id="L331" class="LineNr">331 </span><span class="Delimiter">}</span>
<span id="L332" class="LineNr">332 </span>
<span id="L333" class="LineNr">333 </span><span class="Normal">int</span> trace_count<span class="Delimiter">(</span>string label<span class="Delimiter">,</span> string line<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L334" class="LineNr">334 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!<span class="Special">Trace_stream</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L335" class="LineNr">335 </span> <span class="Normal">long</span> result = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L336" class="LineNr">336 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>vector&lt;trace_line&gt;::iterator p = <span class="Special">Trace_stream</span><span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != <span class="Special">Trace_stream</span><span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span><a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L337" class="LineNr">337 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>label == p<span class="Delimiter">-&gt;</span>label<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L338" class="LineNr">338 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>line == <span class="Constant">&quot;&quot;</span> || <a href='003trace.cc.html#L394'>trim</a><span class="Delimiter">(</span>line<span class="Delimiter">)</span> == <a href='003trace.cc.html#L394'>trim</a><span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>contents<span class="Delimiter">))</span>
<span id="L339" class="LineNr">339 </span> ++result<span class="Delimiter">;</span>
<span id="L340" class="LineNr">340 </span> <span class="Delimiter">}</span>
<span id="L341" class="LineNr">341 </span> <span class="Delimiter">}</span>
<span id="L342" class="LineNr">342 </span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span id="L343" class="LineNr">343 </span><span class="Delimiter">}</span>
<span id="L344" class="LineNr">344 </span>
<span id="L345" class="LineNr">345 </span><span class="Normal">int</span> <a href='003trace.cc.html#L345'>trace_count_prefix</a><span class="Delimiter">(</span>string label<span class="Delimiter">,</span> string prefix<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L346" class="LineNr">346 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!<span class="Special">Trace_stream</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L347" class="LineNr">347 </span> <span class="Normal">long</span> result = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L348" class="LineNr">348 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>vector&lt;trace_line&gt;::iterator p = <span class="Special">Trace_stream</span><span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != <span class="Special">Trace_stream</span><span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span><a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L349" class="LineNr">349 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>label == p<span class="Delimiter">-&gt;</span>label<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L350" class="LineNr">350 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L77'>starts_with</a><span class="Delimiter">(</span><a href='003trace.cc.html#L394'>trim</a><span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>contents<span class="Delimiter">),</span> <a href='003trace.cc.html#L394'>trim</a><span class="Delimiter">(</span>prefix<span class="Delimiter">)))</span>
<span id="L351" class="LineNr">351 </span> ++result<span class="Delimiter">;</span>
<span id="L352" class="LineNr">352 </span> <span class="Delimiter">}</span>
<span id="L353" class="LineNr">353 </span> <span class="Delimiter">}</span>
<span id="L354" class="LineNr">354 </span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span id="L355" class="LineNr">355 </span><span class="Delimiter">}</span>
<span id="L356" class="LineNr">356 </span>
<span id="L357" class="LineNr">357 </span><span class="Normal">bool</span> trace_doesnt_contain<span class="Delimiter">(</span>string label<span class="Delimiter">,</span> string line<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L358" class="LineNr">358 </span> <span class="Identifier">return</span> trace_count<span class="Delimiter">(</span>label<span class="Delimiter">,</span> line<span class="Delimiter">)</span> == <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L359" class="LineNr">359 </span><span class="Delimiter">}</span>
<span id="L360" class="LineNr">360 </span>
<span id="L361" class="LineNr">361 </span><span class="Normal">bool</span> trace_doesnt_contain<span class="Delimiter">(</span>string expected<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L362" class="LineNr">362 </span> vector&lt;string&gt; tmp = <a href='003trace.cc.html#L385'>split_first</a><span class="Delimiter">(</span>expected<span class="Delimiter">,</span> <span class="Constant">&quot;: &quot;</span><span class="Delimiter">);</span>
<span id="L363" class="LineNr">363 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>tmp<span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L364" class="LineNr">364 </span> <a href='003trace.cc.html#L196'>raise</a> &lt;&lt; expected &lt;&lt; <span class="Constant">&quot;: missing label or contents in <a href='003trace.cc.html#L189'>trace</a> line\n&quot;</span> &lt;&lt; <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L365" class="LineNr">365 </span> assert<span class="Delimiter">(</span><span class="Constant">false</span><span class="Delimiter">);</span>
<span id="L366" class="LineNr">366 </span> <span class="Delimiter">}</span>
<span id="L367" class="LineNr">367 </span> <span class="Identifier">return</span> trace_doesnt_contain<span class="Delimiter">(</span>tmp<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">),</span> tmp<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">));</span>
<span id="L368" class="LineNr">368 </span><span class="Delimiter">}</span>
<span id="L369" class="LineNr">369 </span>
<span id="L370" class="LineNr">370 </span>vector&lt;string&gt; <a href='003trace.cc.html#L370'>split</a><span class="Delimiter">(</span>string s<span class="Delimiter">,</span> string delim<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L371" class="LineNr">371 </span> vector&lt;string&gt; result<span class="Delimiter">;</span>
<span id="L372" class="LineNr">372 </span> <span class="Normal">size_t</span> begin=<span class="Constant">0</span><span class="Delimiter">,</span> end=s<span class="Delimiter">.</span>find<span class="Delimiter">(</span>delim<span class="Delimiter">);</span>
<span id="L373" class="LineNr">373 </span> <span class="Normal">while</span> <span class="Delimiter">(</span><span class="Constant">true</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L374" class="LineNr">374 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L225'>end</a> == string::npos<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L375" class="LineNr">375 </span> result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>string<span class="Delimiter">(</span>s<span class="Delimiter">,</span> begin<span class="Delimiter">,</span> string::npos<span class="Delimiter">));</span>
<span id="L376" class="LineNr">376 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L377" class="LineNr">377 </span> <span class="Delimiter">}</span>
<span id="L378" class="LineNr">378 </span> result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>string<span class="Delimiter">(</span>s<span class="Delimiter">,</span> begin<span class="Delimiter">,</span> end-begin<span class="Delimiter">));</span>
<span id="L379" class="LineNr">379 </span> begin = end+SIZE<span class="Delimiter">(</span>delim<span class="Delimiter">);</span>
<span id="L380" class="LineNr">380 </span> <a href='003trace.cc.html#L225'>end</a> = s<span class="Delimiter">.</span>find<span class="Delimiter">(</span>delim<span class="Delimiter">,</span> begin<span class="Delimiter">);</span>
<span id="L381" class="LineNr">381 </span> <span class="Delimiter">}</span>
<span id="L382" class="LineNr">382 </span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span id="L383" class="LineNr">383 </span><span class="Delimiter">}</span>
<span id="L384" class="LineNr">384 </span>
<span id="L385" class="LineNr">385 </span>vector&lt;string&gt; <a href='003trace.cc.html#L385'>split_first</a><span class="Delimiter">(</span>string s<span class="Delimiter">,</span> string delim<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L386" class="LineNr">386 </span> vector&lt;string&gt; result<span class="Delimiter">;</span>
<span id="L387" class="LineNr">387 </span> <span class="Normal">size_t</span> end=s<span class="Delimiter">.</span>find<span class="Delimiter">(</span>delim<span class="Delimiter">);</span>
<span id="L388" class="LineNr">388 </span> result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>string<span class="Delimiter">(</span>s<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">,</span> <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">));</span>
<span id="L389" class="LineNr">389 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L225'>end</a> != string::npos<span class="Delimiter">)</span>
<span id="L390" class="LineNr">390 </span> result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>string<span class="Delimiter">(</span>s<span class="Delimiter">,</span> end+SIZE<span class="Delimiter">(</span>delim<span class="Delimiter">),</span> string::npos<span class="Delimiter">));</span>
<span id="L391" class="LineNr">391 </span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span id="L392" class="LineNr">392 </span><span class="Delimiter">}</span>
<span id="L393" class="LineNr">393 </span>
<span id="L394" class="LineNr">394 </span>string <a href='003trace.cc.html#L394'>trim</a><span class="Delimiter">(</span><span class="Normal">const</span> string&amp; s<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L395" class="LineNr">395 </span> string::const_iterator first = s<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>
<span id="L396" class="LineNr">396 </span> <span class="Normal">while</span> <span class="Delimiter">(</span>first != s<span class="Delimiter">.</span><a href='003trace.cc.html#L225'>end</a><span class="Delimiter">()</span> &amp;&amp; isspace<span class="Delimiter">(</span>*first<span class="Delimiter">))</span>
<span id="L397" class="LineNr">397 </span> ++first<span class="Delimiter">;</span>
<span id="L398" class="LineNr">398 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>first == s<span class="Delimiter">.</span><a href='003trace.cc.html#L225'>end</a><span class="Delimiter">())</span> <span class="Identifier">return</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">;</span>
<span id="L399" class="LineNr">399 </span>
<span id="L400" class="LineNr">400 </span> string::const_iterator last = --s<span class="Delimiter">.</span><a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L401" class="LineNr">401 </span> <span class="Normal">while</span> <span class="Delimiter">(</span>last != s<span class="Delimiter">.</span>begin<span class="Delimiter">()</span> &amp;&amp; isspace<span class="Delimiter">(</span>*last<span class="Delimiter">))</span>
<span id="L402" class="LineNr">402 </span> --last<span class="Delimiter">;</span>
<span id="L403" class="LineNr">403 </span> ++last<span class="Delimiter">;</span>
<span id="L404" class="LineNr">404 </span> <span class="Identifier">return</span> string<span class="Delimiter">(</span>first<span class="Delimiter">,</span> last<span class="Delimiter">);</span>
<span id="L405" class="LineNr">405 </span><span class="Delimiter">}</span>
<span id="L406" class="LineNr">406 </span>
<span id="L407" class="LineNr">407 </span><span class="Delimiter">:(before &quot;End Includes&quot;)</span>
<span id="L408" class="LineNr">408 </span><span class="Comment">#include &lt;vector&gt;</span>
<span id="L409" class="LineNr">409 </span><span class="Normal">using</span> std::vector<span class="Delimiter">;</span>
<span id="L410" class="LineNr">410 </span><span class="Comment">#include &lt;list&gt;</span>
<span id="L411" class="LineNr">411 </span><span class="Normal">using</span> std::list<span class="Delimiter">;</span>
<span id="L412" class="LineNr">412 </span><span class="Comment">#include &lt;set&gt;</span>
<span id="L413" class="LineNr">413 </span><span class="Normal">using</span> std::set<span class="Delimiter">;</span>
<span id="L414" class="LineNr">414 </span>
<span id="L415" class="LineNr">415 </span><span class="Comment">#include &lt;sstream&gt;</span>
<span id="L416" class="LineNr">416 </span><span class="Normal">using</span> std::istringstream<span class="Delimiter">;</span>
<span id="L417" class="LineNr">417 </span><span class="Normal">using</span> std::ostringstream<span class="Delimiter">;</span>
<span id="L418" class="LineNr">418 </span>
<span id="L419" class="LineNr">419 </span><span class="Comment">#include &lt;fstream&gt;</span>
<span id="L420" class="LineNr">420 </span><span class="Normal">using</span> std::ifstream<span class="Delimiter">;</span>
<span id="L421" class="LineNr">421 </span><span class="Normal">using</span> std::ofstream<span class="Delimiter">;</span>
<span id="L422" class="LineNr">422 </span>
<span id="L423" class="LineNr">423 </span><span class="Comment">#include &quot;termbox/termbox.h&quot;</span>
<span id="L424" class="LineNr">424 </span>
<span id="L425" class="LineNr">425 </span><span class="Delimiter">:(before &quot;End Globals&quot;)</span>
<span id="L426" class="LineNr">426 </span><span class="Comment">//: In future layers we'll use the depth field as follows:</span>
<span id="L427" class="LineNr">427 </span><span class="Comment">//:</span>
<span id="L428" class="LineNr">428 </span><span class="Comment">//: Errors will be depth 0.</span>
<span id="L429" class="LineNr">429 </span><span class="Comment">//: Mu 'applications' will be able to use depths 1-100 as they like.</span>
<span id="L430" class="LineNr">430 </span><span class="Comment">//: Primitive statements will occupy 101-9989</span>
<span id="L431" class="LineNr">431 </span><span class="Normal">extern</span> <span class="Normal">const</span> <span class="Normal">int</span> <span class="Special">Initial_callstack_depth</span> = <span class="Constant">101</span><span class="Delimiter">;</span>
<span id="L432" class="LineNr">432 </span><span class="Normal">extern</span> <span class="Normal">const</span> <span class="Normal">int</span> <span class="Special">Max_callstack_depth</span> = <span class="Constant">9989</span><span class="Delimiter">;</span>
<span id="L433" class="LineNr">433 </span><span class="Comment">//: Finally, details of primitive Mu statements will occupy depth 9990-9999</span>
<span id="L434" class="LineNr">434 </span><span class="Comment">//: (more on that later as well)</span>
<span id="L435" class="LineNr">435 </span><span class="Comment">//:</span>
<span id="L436" class="LineNr">436 </span><span class="Comment">//: This framework should help us hide some details at each level, mixing</span>
<span id="L437" class="LineNr">437 </span><span class="Comment">//: static ideas like layers with the dynamic notion of call-stack depth.</span>
</pre>
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