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<pre id='vimCodeElement'>
<span class="Comment">//: Allow code for recipes to be pulled in from multiple places.</span>
<span class="Comment">//:</span>
<span class="Comment">//: TODO: switch recipe.steps to a more efficient data structure.</span>

<span class="Delimiter">:(scenario tangle_before)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  +label1
  <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
]

before +label1 [
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
]
<span class="traceContains">+mem: storing 0 in location 1</span>
<span class="traceContains">+mem: storing 0 in location 2</span>
<span class="traceContains">+mem: storing 0 in location 3</span>
<span class="Comment"># nothing else</span>
$mem: <span class="Constant">3</span>

<span class="Comment">//: while loading recipes, load before/after fragments</span>

<span class="Delimiter">:(before &quot;End Globals&quot;)</span>
map&lt;string <span class="Comment">/*</span><span class="Comment">label</span><span class="Comment">*/</span><span class="Delimiter">,</span> recipe&gt; Before_fragments<span class="Delimiter">,</span> After_fragments<span class="Delimiter">;</span>
set&lt;string <span class="Comment">/*</span><span class="Comment">label</span><span class="Comment">*/</span>&gt; Fragments_used<span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End Setup&quot;)</span>
Before_fragments<span class="Delimiter">.</span>clear<span class="Delimiter">();</span>
After_fragments<span class="Delimiter">.</span>clear<span class="Delimiter">();</span>
Fragments_used<span class="Delimiter">.</span>clear<span class="Delimiter">();</span>

<span class="Delimiter">:(before &quot;End Command Handlers&quot;)</span>
<span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>command == <span class="Constant">&quot;before&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
  string label = next_word<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
  recipe tmp = slurp_recipe<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="CommentedCode">//?   cerr &lt;&lt; &quot;adding before fragment &quot; &lt;&lt; label &lt;&lt; '\n'; //? 1</span>
  Before_fragments[label]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>Before_fragments[label]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>end<span class="Delimiter">(),</span> tmp<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> tmp<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>end<span class="Delimiter">());</span>
<span class="Delimiter">}</span>
<span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>command == <span class="Constant">&quot;after&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
  string label = next_word<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
  recipe tmp = slurp_recipe<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="CommentedCode">//?   cerr &lt;&lt; &quot;adding after fragment &quot; &lt;&lt; label &lt;&lt; '\n'; //? 1</span>
  After_fragments[label]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>After_fragments[label]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> tmp<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> tmp<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>end<span class="Delimiter">());</span>
<span class="Delimiter">}</span>

<span class="Comment">//: after all recipes are loaded, insert fragments at appropriate labels.</span>

<span class="Delimiter">:(after &quot;int main&quot;)</span>
  Transform<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>insert_fragments<span class="Delimiter">);</span>

<span class="Comment">//; We might need to perform multiple passes, in case inserted fragments</span>
<span class="Comment">//: include more labels that need further insertions. Track which labels we've</span>
<span class="Comment">//: already processed using an extra field.</span>
<span class="Delimiter">:(before &quot;End instruction Fields&quot;)</span>
<span class="Normal">mutable</span> <span class="Normal">bool</span> tangle_done<span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End instruction Constructor&quot;)</span>
tangle_done = <span class="Constant">false</span><span class="Delimiter">;</span>

<span class="Delimiter">:(code)</span>
<span class="Normal">void</span> insert_fragments<span class="Delimiter">(</span><span class="Normal">const</span> recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Normal">bool</span> made_progress = <span class="Constant">true</span><span class="Delimiter">;</span>
  <span class="Normal">while</span> <span class="Delimiter">(</span>made_progress<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    made_progress = <span class="Constant">false</span><span class="Delimiter">;</span>
    <span class="Comment">// create a new vector because insertions invalidate iterators</span>
    vector&lt;instruction&gt; result<span class="Delimiter">;</span>
    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>Recipe[r]<span class="Delimiter">.</span>steps<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
      <span class="Normal">const</span> instruction inst = Recipe[r]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>is_label || inst<span class="Delimiter">.</span>tangle_done<span class="Delimiter">)</span> <span class="Delimiter">{</span>
        result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>inst<span class="Delimiter">);</span>
        <span class="Identifier">continue</span><span class="Delimiter">;</span>
      <span class="Delimiter">}</span>
      inst<span class="Delimiter">.</span>tangle_done = <span class="Constant">true</span><span class="Delimiter">;</span>
      made_progress = <span class="Constant">true</span><span class="Delimiter">;</span>
      Fragments_used<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label<span class="Delimiter">);</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>Before_fragments<span class="Delimiter">.</span>find<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label<span class="Delimiter">)</span> != Before_fragments<span class="Delimiter">.</span>end<span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span class="CommentedCode">//?         cerr &lt;&lt; &quot;loading code before &quot; &lt;&lt; inst.label &lt;&lt; '\n'; //? 1</span>
        result<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>result<span class="Delimiter">.</span>end<span class="Delimiter">(),</span> Before_fragments[inst<span class="Delimiter">.</span>label]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> Before_fragments[inst<span class="Delimiter">.</span>label]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>end<span class="Delimiter">());</span>
      <span class="Delimiter">}</span>
      result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>inst<span class="Delimiter">);</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>After_fragments<span class="Delimiter">.</span>find<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label<span class="Delimiter">)</span> != After_fragments<span class="Delimiter">.</span>end<span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span class="CommentedCode">//?         cerr &lt;&lt; &quot;loading code after &quot; &lt;&lt; inst.label &lt;&lt; '\n'; //? 1</span>
        result<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>result<span class="Delimiter">.</span>end<span class="Delimiter">(),</span> After_fragments[inst<span class="Delimiter">.</span>label]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> After_fragments[inst<span class="Delimiter">.</span>label]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>end<span class="Delimiter">());</span>
      <span class="Delimiter">}</span>
    <span class="Delimiter">}</span>
    Recipe[r]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>swap<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

<span class="Comment">//: warn about unapplied fragments</span>
<span class="Delimiter">:(before &quot;End Globals&quot;)</span>
<span class="Normal">bool</span> Transform_check_insert_fragments_Ran = <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End One-time Setup&quot;)</span>
Transform<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>check_insert_fragments<span class="Delimiter">);</span>  <span class="Comment">// final transform</span>
<span class="Delimiter">:(code)</span>
<span class="Normal">void</span> check_insert_fragments<span class="Delimiter">(</span>unused recipe_ordinal<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>Transform_check_insert_fragments_Ran<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
  Transform_check_insert_fragments_Ran = <span class="Constant">true</span><span class="Delimiter">;</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> recipe&gt;::iterator p = Before_fragments<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != Before_fragments<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>Fragments_used<span class="Delimiter">.</span>find<span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">)</span> == Fragments_used<span class="Delimiter">.</span>end<span class="Delimiter">())</span>
      raise &lt;&lt; <span class="Constant">&quot;could not locate insert before &quot;</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>first &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
  <span class="Delimiter">}</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> recipe&gt;::iterator p = After_fragments<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != After_fragments<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>Fragments_used<span class="Delimiter">.</span>find<span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">)</span> == Fragments_used<span class="Delimiter">.</span>end<span class="Delimiter">())</span>
      raise &lt;&lt; <span class="Constant">&quot;could not locate insert after &quot;</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>first &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(scenario tangle_before_and_after)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  +label1
  <span class="Constant">4</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
]
before +label1 [
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
]
after +label1 [
  <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
]
<span class="traceContains">+mem: storing 0 in location 1</span>
<span class="traceContains">+mem: storing 0 in location 2</span>
<span class="Comment"># label1</span>
<span class="traceContains">+mem: storing 0 in location 3</span>
<span class="traceContains">+mem: storing 0 in location 4</span>
<span class="Comment"># nothing else</span>
$mem: <span class="Constant">4</span>

<span class="Delimiter">:(scenario tangle_keeps_labels_separate)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  +label1
  +label2
  <span class="Constant">6</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
]
before +label1 [
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
]
after +label1 [
  <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
]
before +label2 [
  <span class="Constant">4</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
]
after +label2 [
  <span class="Constant">5</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
]
<span class="traceContains">+mem: storing 0 in location 1</span>
<span class="traceContains">+mem: storing 0 in location 2</span>
<span class="Comment"># label1</span>
<span class="traceContains">+mem: storing 0 in location 3</span>
<span class="Comment"># 'after' fragments for earlier label always go before 'before' fragments for later label</span>
<span class="traceContains">+mem: storing 0 in location 4</span>
<span class="Comment"># label2</span>
<span class="traceContains">+mem: storing 0 in location 5</span>
<span class="traceContains">+mem: storing 0 in location 6</span>
<span class="Comment"># nothing else</span>
$mem: <span class="Constant">6</span>

<span class="Delimiter">:(scenario tangle_stacks_multiple_fragments)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  +label1
  <span class="Constant">6</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
]
before +label1 [
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
]
after +label1 [
  <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
]
before +label1 [
  <span class="Constant">4</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
]
after +label1 [
  <span class="Constant">5</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
]
<span class="traceContains">+mem: storing 0 in location 1</span>
<span class="Comment"># 'before' fragments stack in order</span>
<span class="traceContains">+mem: storing 0 in location 2</span>
<span class="traceContains">+mem: storing 0 in location 4</span>
<span class="Comment"># label1</span>
<span class="Comment"># 'after' fragments stack in reverse order</span>
<span class="traceContains">+mem: storing 0 in location 5</span>
<span class="traceContains">+mem: storing 0 in location 3</span>
<span class="traceContains">+mem: storing 0 in location 6</span>
<span class="Comment"># nothing else</span>
$mem: <span class="Constant">6</span>

<span class="Delimiter">:(scenario tangle_supports_fragments_with_multiple_instructions)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  +label1
  <span class="Constant">6</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
]
before +label1 [
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
]
after +label1 [
  <span class="Constant">4</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Constant">5</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
]
<span class="traceContains">+mem: storing 0 in location 1</span>
<span class="traceContains">+mem: storing 0 in location 2</span>
<span class="traceContains">+mem: storing 0 in location 3</span>
<span class="Comment"># label1</span>
<span class="traceContains">+mem: storing 0 in location 4</span>
<span class="traceContains">+mem: storing 0 in location 5</span>
<span class="traceContains">+mem: storing 0 in location 6</span>
<span class="Comment"># nothing else</span>
$mem: <span class="Constant">6</span>

<span class="Delimiter">:(scenario tangle_tangles_into_all_labels_with_same_name)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">10</span>
  +label1
  <span class="Constant">4</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">10</span>
  recipe2
]
recipe recipe2 [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">11</span>
  +label1
  <span class="Constant">4</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">11</span>
]
before +label1 [
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">12</span>
]
after +label1 [
  <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">12</span>
]
<span class="traceContains">+mem: storing 10 in location 1</span>
<span class="traceContains">+mem: storing 12 in location 2</span>
<span class="Comment"># label1</span>
<span class="traceContains">+mem: storing 12 in location 3</span>
<span class="traceContains">+mem: storing 10 in location 4</span>
<span class="Comment"># recipe2</span>
<span class="traceContains">+mem: storing 11 in location 1</span>
<span class="traceContains">+mem: storing 12 in location 2</span>
<span class="Comment"># label1</span>
<span class="traceContains">+mem: storing 12 in location 3</span>
<span class="traceContains">+mem: storing 11 in location 4</span>
<span class="Comment"># nothing else</span>
$mem: <span class="Constant">8</span>

<span class="Delimiter">:(scenario tangle_tangles_into_all_labels_with_same_name_2)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">10</span>
  +label1
  +label1
  <span class="Constant">4</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">10</span>
]
before +label1 [
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">12</span>
]
after +label1 [
  <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">12</span>
]
<span class="traceContains">+mem: storing 10 in location 1</span>
<span class="traceContains">+mem: storing 12 in location 2</span>
<span class="Comment"># label1</span>
<span class="traceContains">+mem: storing 12 in location 3</span>
<span class="traceContains">+mem: storing 12 in location 2</span>
<span class="Comment"># label1</span>
<span class="traceContains">+mem: storing 12 in location 3</span>
<span class="traceContains">+mem: storing 10 in location 4</span>
<span class="Comment"># nothing else</span>
$mem: <span class="Constant">6</span>

<span class="Delimiter">:(scenario tangle_tangles_into_all_labels_with_same_name_3)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">10</span>
  +label1
  +foo
  <span class="Constant">4</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">10</span>
]
before +label1 [
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">12</span>
]
after +label1 [
  <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">12</span>
]
after +foo [
  +label1
]
<span class="traceContains">+mem: storing 10 in location 1</span>
<span class="traceContains">+mem: storing 12 in location 2</span>
<span class="Comment"># label1</span>
<span class="traceContains">+mem: storing 12 in location 3</span>
<span class="traceContains">+mem: storing 12 in location 2</span>
<span class="Comment"># +foo/label1</span>
<span class="traceContains">+mem: storing 12 in location 3</span>
<span class="traceContains">+mem: storing 10 in location 4</span>
<span class="Comment"># nothing else</span>
$mem: <span class="Constant">6</span>
</pre>
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