archive/Readme.md


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This directory contains earlier prototypes.

* 0.vm.arc: an early prototype of a statement-oriented interpreted language
  built in Arc. Now has its own repo at
  [mu0](https://github.com/akkartik/mu0).

* 1.vm: a statement-oriented interpreted language. Now has its own repo at
  [mu1](https://github.com/akkartik/mu1).

* 2.transect: an abortive design for a safe low-level language with manual
  register allocation.
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<a href='https://github.com/akkartik/mu/blob/master/059to_text.mu'>https://github.com/akkartik/mu/blob/master/059to_text.mu</a>
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<span id="L1" class="LineNr"> 1 </span><span class="Comment"># A couple of variants of 'to-text' that we'll use implicitly in stashes (see</span>
<span id="L2" class="LineNr"> 2 </span><span class="Comment"># later layers).</span>
<span id="L3" class="LineNr"> 3 </span><span class="Comment">#</span>
<span id="L4" class="LineNr"> 4 </span><span class="Comment"># Mu code might specialize them to be smarter, but I don't anticipate any need</span>
<span id="L5" class="LineNr"> 5 </span><span class="Comment"># beyond specializing 'to-text' itself.</span>
<span id="L6" class="LineNr"> 6 </span>
<span id="L7" class="LineNr"> 7 </span><span class="Comment"># 'shorter' variant of to-text, when you want to enable some sort of trimming</span>
<span id="L8" class="LineNr"> 8 </span><span class="Comment"># define it to be identical to 'to-text' by default</span>
<span id="L9" class="LineNr"> 9 </span><span class="muRecipe">def</span> to-text-line x:_elem<span class="muRecipe"> -&gt; </span>y:text [
<span id="L10" class="LineNr">10 </span>  <span class="Constant">local-scope</span>
<span id="L11" class="LineNr">11 </span>  <span class="Constant">load-inputs</span>
<span id="L12" class="LineNr">12 </span>  y <span class="Special">&lt;-</span> to-text x
<span id="L13" class="LineNr">13 </span>]
<span id="L14" class="LineNr">14 </span>
<span id="L15" class="LineNr">15 </span><span class="Comment"># variant for arrays (since we can't pass them around otherwise)</span>
<span id="L16" class="LineNr">16 </span><span class="muRecipe">def</span> <a href='059to_text.mu.html#L16'>array-to-text-line</a> x:&amp;:@:_elem<span class="muRecipe"> -&gt; </span>y:text [
<span id="L17" class="LineNr">17 </span>  <span class="Constant">local-scope</span>
<span id="L18" class="LineNr">18 </span>  <span class="Constant">load-inputs</span>
<span id="L19" class="LineNr">19 </span>  y <span class="Special">&lt;-</span> to-text *x
<span id="L20" class="LineNr">20 </span>]
<span id="L21" class="LineNr">21 </span>
<span id="L22" class="LineNr">22 </span><span class="muScenario">scenario</span> to-text-line-early-warning-for-static-dispatch [
<span id="L23" class="LineNr">23 </span>  x:text <span class="Special">&lt;-</span> to-text-line<span class="Constant"> 34</span>
<span id="L24" class="LineNr">24 </span>  <span class="Comment"># just ensure there were no errors</span>
<span id="L25" class="LineNr">25 </span>]
<span id="L26" class="LineNr">26 </span>
<span id="L27" class="LineNr">27 </span><span class="muScenario">scenario</span> array-to-text-line-early-warning-for-static-dispatch [
<span id="L28" class="LineNr">28 </span>  n:&amp;:@:num <span class="Special">&lt;-</span> new <span class="Constant">number:type</span>,<span class="Constant"> 3</span>
<span id="L29" class="LineNr">29 </span>  x:text <span class="Special">&lt;-</span> <a href='059to_text.mu.html#L16'>array-to-text-line</a> n
<span id="L30" class="LineNr">30 </span>  <span class="Comment"># just ensure there were no errors</span>
<span id="L31" class="LineNr">31 </span>]
<span id="L32" class="LineNr">32 </span>
<span id="L33" class="LineNr">33 </span><span class="Comment"># finally, a specialization for single characters</span>
<span id="L34" class="LineNr">34 </span><span class="muRecipe">def</span> to-text c:char<span class="muRecipe"> -&gt; </span>y:text [
<span id="L35" class="LineNr">35 </span>  <span class="Constant">local-scope</span>
<span id="L36" class="LineNr">36 </span>  <span class="Constant">load-inputs</span>
<span id="L37" class="LineNr">37 </span>  y <span class="Special">&lt;-</span> new <span class="Constant">character:type</span>, <span class="Constant">1/capacity</span>
<span id="L38" class="LineNr">38 </span>  *y <span class="Special">&lt;-</span> put-index *y,<span class="Constant"> 0</span>, c
<span id="L39" class="LineNr">39 </span>]
<span id="L40" class="LineNr">40 </span>
<span id="L41" class="LineNr">41 </span><span class="muScenario">scenario</span> character-to-text [
<span id="L42" class="LineNr">42 </span>  1:char <span class="Special">&lt;-</span> copy <span class="Constant">111/o</span>
<span id="L43" class="LineNr">43 </span>  2:text <span class="Special">&lt;-</span> to-text 1:char
<span id="L44" class="LineNr">44 </span>  3:@:char <span class="Special">&lt;-</span> copy *2:text
<span id="L45" class="LineNr">45 </span>  memory-should-contain [
<span id="L46" class="LineNr">46 </span>    3:array:character <span class="Special">&lt;-</span> <span class="Constant">[o]</span>
<span id="L47" class="LineNr">47 </span>  ]
<span id="L48" class="LineNr">48 </span>]
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