ranger - mirror of ranger - a simple, vim-like file manager

	Commit message (Collapse)	Author	Age	Files	Lines
*	general updates	hut	2011-10-08	1	-22/+6
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*	Moved HACKING and TODO to doc/	hut	2011-01-04	1	-0/+95

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<pre id='vimCodeElement'>
<span class="Comment">//: Containers contain a fixed number of elements of different types.</span>

<span class="Delimiter">:(before &quot;End Mu Types Initialization&quot;)</span>
<span class="Comment">//: We'll use this container as a running example, with two number elements.</span>
type_number point = Type_number[<span class="Constant">&quot;point&quot;</span>] = Next_type_number++<span class="Delimiter">;</span>
Type[point]<span class="Delimiter">.</span>size = <span class="Constant">2</span><span class="Delimiter">;</span>
Type[point]<span class="Delimiter">.</span>kind = container<span class="Delimiter">;</span>
Type[point]<span class="Delimiter">.</span>name = <span class="Constant">&quot;point&quot;</span><span class="Delimiter">;</span>
vector&lt;type_number&gt; i<span class="Delimiter">;</span>
i<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>number<span class="Delimiter">);</span>
Type[point]<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
Type[point]<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>i<span class="Delimiter">);</span>

<span class="Comment">//: Containers can be copied around with a single instruction just like</span>
<span class="Comment">//: numbers, no matter how large they are.</span>

<span class="Comment">//: Tests in this layer often explicitly setup memory before reading it as a</span>
<span class="Comment">//: container. Don't do this in general. I'm tagging exceptions with /raw to</span>
<span class="Comment">//: avoid warnings.</span>
<span class="Delimiter">:(scenario copy_multiple_locations)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>:literal
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">35</span>:literal
  <span class="Constant">3</span>:point<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>:point/<span class="Special">raw</span>  <span class="Comment"># unsafe</span>
]
<span class="traceContains">+mem: storing 34 in location 3</span>
<span class="traceContains">+mem: storing 35 in location 4</span>

<span class="Delimiter">:(before &quot;End Mu Types Initialization&quot;)</span>
<span class="Comment">// A more complex container, containing another container as one of its</span>
<span class="Comment">// elements.</span>
type_number point_number = Type_number[<span class="Constant">&quot;point-number&quot;</span>] = Next_type_number++<span class="Delimiter">;</span>
Type[point_number]<span class="Delimiter">.</span>size = <span class="Constant">2</span><span class="Delimiter">;</span>
Type[point_number]<span class="Delimiter">.</span>kind = container<span class="Delimiter">;</span>
Type[point_number]<span class="Delimiter">.</span>name = <span class="Constant">&quot;point-number&quot;</span><span class="Delimiter">;</span>
vector&lt;type_number&gt; p2<span class="Delimiter">;</span>
p2<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>point<span class="Delimiter">);</span>
Type[point_number]<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>p2<span class="Delimiter">);</span>
vector&lt;type_number&gt; i2<span class="Delimiter">;</span>
i2<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>number<span class="Delimiter">);</span>
Type[point_number]<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>i2<span class="Delimiter">);</span>

<span class="Delimiter">:(scenario copy_handles_nested_container_elements)</span>
recipe main [
  <span class="Constant">12</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>:literal
  <span class="Constant">13</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">35</span>:literal
  <span class="Constant">14</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">36</span>:literal
  <span class="Constant">15</span>:point-number<span class="Special"> &lt;- </span>copy <span class="Constant">12</span>:point-number/<span class="Special">raw</span>  <span class="Comment"># unsafe</span>
]
<span class="traceContains">+mem: storing 36 in location 17</span>

<span class="Comment">//: Containers can be checked for equality with a single instruction just like</span>
<span class="Comment">//: numbers, no matter how large they are.</span>

<span class="Delimiter">:(scenario compare_multiple_locations)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>:literal  <span class="Comment"># first</span>
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">35</span>:literal
  <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">36</span>:literal
  <span class="Constant">4</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>:literal  <span class="Comment"># second</span>
  <span class="Constant">5</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">35</span>:literal
  <span class="Constant">6</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">36</span>:literal
  <span class="Constant">7</span>:boolean<span class="Special"> &lt;- </span>equal <span class="Constant">1</span>:point-number/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">4</span>:point-number/<span class="Special">raw</span>  <span class="Comment"># unsafe</span>
]
<span class="traceContains">+mem: storing 1 in location 7</span>

<span class="Delimiter">:(scenario compare_multiple_locations2)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>:literal  <span class="Comment"># first</span>
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">35</span>:literal
  <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">36</span>:literal
  <span class="Constant">4</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>:literal  <span class="Comment"># second</span>
  <span class="Constant">5</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">35</span>:literal
  <span class="Constant">6</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">37</span>:literal  <span class="Comment"># different</span>
  <span class="Constant">7</span>:boolean<span class="Special"> &lt;- </span>equal <span class="Constant">1</span>:point-number/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">4</span>:point-number/<span class="Special">raw</span>  <span class="Comment"># unsafe</span>
]
<span class="traceContains">+mem: storing 0 in location 7</span>

<span class="Delimiter">:(before &quot;End size_of(types) Cases&quot;)</span>
type_info t = Type[types<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span>]<span class="Delimiter">;</span>
if <span class="Delimiter">(</span>t<span class="Delimiter">.</span>kind == container<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Comment">// size of a container is the sum of the sizes of its elements</span>
  long long int result = <span class="Constant">0</span><span class="Delimiter">;</span>
  for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>t<span class="Delimiter">.</span>elements<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    <span class="Comment">// todo: strengthen assertion to disallow mutual type recursion</span>
    assert<span class="Delimiter">(</span>types<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> != t<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
    result += size_of<span class="Delimiter">(</span>t<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="SalientComment">//:: To access elements of a container, use 'get'</span>
<span class="Delimiter">:(scenario get)</span>
recipe main [
  <span class="Constant">12</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>:literal
  <span class="Constant">13</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">35</span>:literal
  <span class="Constant">15</span>:number<span class="Special"> &lt;- </span>get <span class="Constant">12</span>:point/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">1</span>:offset  <span class="Comment"># unsafe</span>
]
<span class="traceContains">+mem: storing 35 in location 15</span>

<span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
GET<span class="Delimiter">,</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
Recipe_number[<span class="Constant">&quot;get&quot;</span>] = GET<span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
case GET: <span class="Delimiter">{</span>
  reagent base = current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
  long long int base_address = base<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
  type_number base_type = base<span class="Delimiter">.</span>types<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
  assert<span class="Delimiter">(</span>Type[base_type]<span class="Delimiter">.</span>kind == container<span class="Delimiter">);</span>
  assert<span class="Delimiter">(</span>isa_literal<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)));</span>
  assert<span class="Delimiter">(</span>scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)));</span>
  long long int offset = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
  long long int src = base_address<span class="Delimiter">;</span>
  for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; offset<span class="Delimiter">;</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    src += size_of<span class="Delimiter">(</span>Type[base_type]<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
  <span class="Delimiter">}</span>
  trace<span class="Delimiter">(</span>Primitive_recipe_depth<span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;address to copy is &quot;</span> &lt;&lt; src<span class="Delimiter">;</span>
  assert<span class="Delimiter">(</span>Type[base_type]<span class="Delimiter">.</span>kind == container<span class="Delimiter">);</span>
  assert<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>Type[base_type]<span class="Delimiter">.</span>elements<span class="Delimiter">)</span> &gt; offset<span class="Delimiter">);</span>
  type_number src_type = Type[base_type]<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>offset<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
  trace<span class="Delimiter">(</span>Primitive_recipe_depth<span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;its type is &quot;</span> &lt;&lt; src_type<span class="Delimiter">;</span>
  reagent tmp<span class="Delimiter">;</span>
  tmp<span class="Delimiter">.</span>set_value<span class="Delimiter">(</span>src<span class="Delimiter">);</span>
  tmp<span class="Delimiter">.</span>types<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>src_type<span class="Delimiter">);</span>
  products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>read_memory<span class="Delimiter">(</span>tmp<span class="Delimiter">));</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(scenario get_handles_nested_container_elements)</span>
recipe main [
  <span class="Constant">12</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>:literal
  <span class="Constant">13</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">35</span>:literal
  <span class="Constant">14</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">36</span>:literal
  <span class="Constant">15</span>:number<span class="Special"> &lt;- </span>get <span class="Constant">12</span>:point-number/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">1</span>:offset  <span class="Comment"># unsafe</span>
]
<span class="traceContains">+mem: storing 36 in location 15</span>

<span class="SalientComment">//:: To write to elements of containers, you need their address.</span>

<span class="Delimiter">:(scenario get_address)</span>
recipe main [
  <span class="Constant">12</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>:literal
  <span class="Constant">13</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">35</span>:literal
  <span class="Constant">15</span>:address:number<span class="Special"> &lt;- </span>get-address <span class="Constant">12</span>:point/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">1</span>:offset  <span class="Comment"># unsafe</span>
]
<span class="traceContains">+mem: storing 13 in location 15</span>

<span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
GET_ADDRESS<span class="Delimiter">,</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
Recipe_number[<span class="Constant">&quot;get-address&quot;</span>] = GET_ADDRESS<span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
case GET_ADDRESS: <span class="Delimiter">{</span>
  reagent base = current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
  long long int base_address = base<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
  type_number base_type = base<span class="Delimiter">.</span>types<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
  assert<span class="Delimiter">(</span>Type[base_type]<span class="Delimiter">.</span>kind == container<span class="Delimiter">);</span>
  assert<span class="Delimiter">(</span>isa_literal<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)));</span>
  assert<span class="Delimiter">(</span>scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)));</span>
  long long int offset = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
  long long int result = base_address<span class="Delimiter">;</span>
  for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; offset<span class="Delimiter">;</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    result += size_of<span class="Delimiter">(</span>Type[base_type]<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
  <span class="Delimiter">}</span>
  trace<span class="Delimiter">(</span>Primitive_recipe_depth<span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;address to copy is &quot;</span> &lt;&lt; result<span class="Delimiter">;</span>
  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="SalientComment">//:: Allow containers to be defined in mu code.</span>

<span class="Delimiter">:(scenarios load)</span>
<span class="Delimiter">:(scenario container)</span>
container foo [
  x:number
  y:number
]
<span class="traceContains">+parse: reading container foo</span>
<span class="traceContains">+parse:   element name: x</span>
<span class="traceContains">+parse:   type: 1</span>
<span class="traceContains">+parse:   element name: y</span>
<span class="traceContains">+parse:   type: 1</span>

<span class="Delimiter">:(scenario container_use_before_definition)</span>
container foo [
  x:number
  y:bar
]

container bar [
  x:number
  y:number
]
<span class="traceContains">+parse: reading container foo</span>
<span class="traceContains">+parse: type number: 1000</span>
<span class="traceContains">+parse:   element name: x</span>
<span class="traceContains">+parse:   type: 1</span>
<span class="traceContains">+parse:   element name: y</span>
<span class="traceContains">+parse:   type: 1001</span>
<span class="traceContains">+parse: reading container bar</span>
<span class="traceContains">+parse: type number: 1001</span>

<span class="Delimiter">:(before &quot;End Command Handlers&quot;)</span>
else if <span class="Delimiter">(</span>command == <span class="Constant">&quot;container&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
  insert_container<span class="Delimiter">(</span>command<span class="Delimiter">,</span> container<span class="Delimiter">,</span> in<span class="Delimiter">);</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(code)</span>
void insert_container<span class="Delimiter">(</span>const string&amp; command<span class="Delimiter">,</span> kind_of_type kind<span class="Delimiter">,</span> istream&amp; in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  skip_whitespace<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
  string name = next_word<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
  trace<span class="Delimiter">(</span><span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;reading &quot;</span> &lt;&lt; command &lt;&lt; <span class="Constant">' '</span> &lt;&lt; name<span class="Delimiter">;</span>
<span class="CommentedCode">//?   cout &lt;&lt; name &lt;&lt; '\n'; //? 2</span>
<span class="CommentedCode">//?   if (Type_number.find(name) != Type_number.end()) //? 1</span>
<span class="CommentedCode">//?     cerr &lt;&lt; Type_number[name] &lt;&lt; '\n'; //? 1</span>
  if <span class="Delimiter">(</span>Type_number<span class="Delimiter">.</span>find<span class="Delimiter">(</span>name<span class="Delimiter">)</span> == Type_number<span class="Delimiter">.</span>end<span class="Delimiter">()</span>
      || Type_number[name] == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
    Type_number[name] = Next_type_number++<span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  trace<span class="Delimiter">(</span><span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;type number: &quot;</span> &lt;&lt; Type_number[name]<span class="Delimiter">;</span>
  skip_bracket<span class="Delimiter">(</span>in<span class="Delimiter">,</span> <span class="Constant">&quot;'container' must begin with '['&quot;</span><span class="Delimiter">);</span>
  type_info&amp; t = Type[Type_number[name]]<span class="Delimiter">;</span>
  recently_added_types<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>Type_number[name]<span class="Delimiter">);</span>
  t<span class="Delimiter">.</span>name = name<span class="Delimiter">;</span>
  t<span class="Delimiter">.</span>kind = kind<span class="Delimiter">;</span>
  while <span class="Delimiter">(</span>!in<span class="Delimiter">.</span>eof<span class="Delimiter">())</span> <span class="Delimiter">{</span>
    skip_whitespace_and_comments<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
    string element = next_word<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
    if <span class="Delimiter">(</span>element == <span class="Constant">&quot;]&quot;</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
    istringstream inner<span class="Delimiter">(</span>element<span class="Delimiter">);</span>
    t<span class="Delimiter">.</span>element_names<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>slurp_until<span class="Delimiter">(</span>inner<span class="Delimiter">,</span> <span class="Constant">':'</span><span class="Delimiter">));</span>
    trace<span class="Delimiter">(</span><span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;  element name: &quot;</span> &lt;&lt; t<span class="Delimiter">.</span>element_names<span class="Delimiter">.</span>back<span class="Delimiter">();</span>
    vector&lt;type_number&gt; types<span class="Delimiter">;</span>
    while <span class="Delimiter">(</span>!inner<span class="Delimiter">.</span>eof<span class="Delimiter">())</span> <span class="Delimiter">{</span>
      string type_name = slurp_until<span class="Delimiter">(</span>inner<span class="Delimiter">,</span> <span class="Constant">':'</span><span class="Delimiter">);</span>
      if <span class="Delimiter">(</span>Type_number<span class="Delimiter">.</span>find<span class="Delimiter">(</span>type_name<span class="Delimiter">)</span> == Type_number<span class="Delimiter">.</span>end<span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span class="CommentedCode">//?         cerr &lt;&lt; type_name &lt;&lt; &quot; is &quot; &lt;&lt; Next_type_number &lt;&lt; '\n'; //? 1</span>
        Type_number[type_name] = Next_type_number++<span class="Delimiter">;</span>
      <span class="Delimiter">}</span>
      types<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>Type_number[type_name]<span class="Delimiter">);</span>
      trace<span class="Delimiter">(</span><span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;  type: &quot;</span> &lt;&lt; types<span class="Delimiter">.</span>back<span class="Delimiter">();</span>
    <span class="Delimiter">}</span>
    t<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>types<span class="Delimiter">);</span>
  <span class="Delimiter">}</span>
  assert<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>t<span class="Delimiter">.</span>elements<span class="Delimiter">)</span> == SIZE<span class="Delimiter">(</span>t<span class="Delimiter">.</span>element_names<span class="Delimiter">));</span>
  t<span class="Delimiter">.</span>size = SIZE<span class="Delimiter">(</span>t<span class="Delimiter">.</span>elements<span class="Delimiter">);</span>
<span class="Delimiter">}</span>

<span class="Comment">//: ensure types created in one scenario don't leak outside it.</span>
<span class="Delimiter">:(before &quot;End Globals&quot;)</span>
vector&lt;type_number&gt; recently_added_types<span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End load_permanently&quot;)</span>  <span class="Comment">//: for non-tests</span>
recently_added_types<span class="Delimiter">.</span>clear<span class="Delimiter">();</span>
<span class="Delimiter">:(before &quot;End Setup&quot;)</span>  <span class="Comment">//: for tests</span>
for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>recently_added_types<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="CommentedCode">//?   cout &lt;&lt; &quot;erasing &quot; &lt;&lt; Type[recently_added_types.at(i)].name &lt;&lt; '\n'; //? 1</span>
  Type_number<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>Type[recently_added_types<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span>]<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
  Type<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>recently_added_types<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
<span class="Delimiter">}</span>
recently_added_types<span class="Delimiter">.</span>clear<span class="Delimiter">();</span>
<span class="Comment">// delete recent type references</span>
<span class="Comment">// can't rely on recently_added_types to cleanup Type_number, because of deliberately misbehaving tests with references to undefined types</span>
map&lt;string<span class="Delimiter">,</span> type_number&gt;::iterator p = Type_number<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>
while<span class="Delimiter">(</span>p != Type_number<span class="Delimiter">.</span>end<span class="Delimiter">())</span> <span class="Delimiter">{</span>
  <span class="Comment">// save current item</span>
  string name = p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">;</span>
  type_number t = p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">;</span>
  <span class="Comment">// increment iterator</span>
  ++p<span class="Delimiter">;</span>
  <span class="Comment">// now delete current item if necessary</span>
  if <span class="Delimiter">(</span>t &gt;= <span class="Constant">1000</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="CommentedCode">//?     cerr &lt;&lt; &quot;AAA &quot; &lt;&lt; name &lt;&lt; &quot; &quot; &lt;&lt; t &lt;&lt; '\n'; //? 1</span>
    Type_number<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>name<span class="Delimiter">);</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Comment">//: lastly, ensure scenarios are consistent by always starting them at the</span>
<span class="Comment">//: same type number.</span>
Next_type_number = <span class="Constant">1000</span><span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End Test Run Initialization&quot;)</span>
assert<span class="Delimiter">(</span>Next_type_number &lt; <span class="Constant">1000</span><span class="Delimiter">);</span>
<span class="Delimiter">:(before &quot;End Setup&quot;)</span>
Next_type_number = <span class="Constant">1000</span><span class="Delimiter">;</span>

<span class="SalientComment">//:: Allow container definitions anywhere in the codebase, but warn if you</span>
<span class="SalientComment">//:: can't find a definition.</span>

<span class="Delimiter">:(scenarios run)</span>
<span class="Delimiter">:(scenario run_warns_on_unknown_types)</span>
<span class="Special">% Hide_warnings = true;</span>
<span class="CommentedCode">#? % Trace_stream-&gt;dump_layer = &quot;run&quot;;</span>
recipe main [
  <span class="Comment"># integer is not a type</span>
  <span class="Constant">1</span>:integer<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>:literal
]
<span class="traceContains">+warn: unknown type: integer</span>

<span class="Delimiter">:(scenario run_allows_type_definition_after_use)</span>
<span class="Special">% Hide_warnings = true;</span>
recipe main [
  <span class="Constant">1</span>:bar<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>:literal
]

container bar [
  x:number
]
<span class="traceAbsent">-warn: unknown type: bar</span>

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

<span class="Delimiter">:(code)</span>
void check_invalid_types<span class="Delimiter">(</span>const recipe_number r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  for <span class="Delimiter">(</span>long long int index = <span class="Constant">0</span><span class="Delimiter">;</span> index &lt; SIZE<span class="Delimiter">(</span>Recipe[r]<span class="Delimiter">.</span>steps<span class="Delimiter">);</span> ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    const instruction&amp; inst = Recipe[r]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
    for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
      check_invalid_types<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
    <span class="Delimiter">}</span>
    for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
      check_invalid_types<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

void check_invalid_types<span class="Delimiter">(</span>const reagent&amp; r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>r<span class="Delimiter">.</span>types<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    if <span class="Delimiter">(</span>r<span class="Delimiter">.</span>types<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
    if <span class="Delimiter">(</span>Type<span class="Delimiter">.</span>find<span class="Delimiter">(</span>r<span class="Delimiter">.</span>types<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> == Type<span class="Delimiter">.</span>end<span class="Delimiter">())</span>
      raise &lt;&lt; <span class="Constant">&quot;unknown type: &quot;</span> &lt;&lt; r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>second<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(scenario container_unknown_field)</span>
<span class="Special">% Hide_warnings = true;</span>
container foo [
  x:number
  y:bar
]
<span class="traceContains">+warn: unknown type for field y in foo</span>

<span class="Delimiter">:(scenario read_container_with_bracket_in_comment)</span>
container foo [
  x:number
  <span class="Comment"># ']' in comment</span>
  y:number
]
<span class="traceContains">+parse: reading container foo</span>
<span class="traceContains">+parse:   element name: x</span>
<span class="traceContains">+parse:   type: 1</span>
<span class="traceContains">+parse:   element name: y</span>
<span class="traceContains">+parse:   type: 1</span>

<span class="Delimiter">:(before &quot;End Load Sanity Checks&quot;)</span>
check_container_field_types<span class="Delimiter">();</span>

<span class="Delimiter">:(code)</span>
void check_container_field_types<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  for <span class="Delimiter">(</span>map&lt;type_number<span class="Delimiter">,</span> type_info&gt;::iterator p = Type<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != Type<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    const type_info&amp; info = p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">;</span>
<span class="CommentedCode">//?     cerr &lt;&lt; &quot;checking &quot; &lt;&lt; p-&gt;first &lt;&lt; '\n'; //? 1</span>
    for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
      for <span class="Delimiter">(</span>long long int j = <span class="Constant">0</span><span class="Delimiter">;</span> j &lt; SIZE<span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span> ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
        if <span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span>j<span class="Delimiter">)</span> == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
        if <span class="Delimiter">(</span>Type<span class="Delimiter">.</span>find<span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span>j<span class="Delimiter">))</span> == Type<span class="Delimiter">.</span>end<span class="Delimiter">())</span>
          raise &lt;&lt; <span class="Constant">&quot;unknown type for field &quot;</span> &lt;&lt; info<span class="Delimiter">.</span>element_names<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; in &quot;</span> &lt;&lt; info<span class="Delimiter">.</span>name &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
      <span class="Delimiter">}</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

<span class="SalientComment">//:: helpers</span>

<span class="Delimiter">:(code)</span>
void skip_bracket<span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">,</span> string message<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  skip_whitespace_and_comments<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
  if <span class="Delimiter">(</span>in<span class="Delimiter">.</span>get<span class="Delimiter">()</span> != <span class="Constant">'['</span><span class="Delimiter">)</span>
    raise &lt;&lt; message &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
</pre>
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