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<pre id='vimCodeElement'>
<span class="Comment">//: A program is a book of 'recipes' (functions)</span>
<span class="Delimiter">:(before &quot;End Globals&quot;)</span>
<span class="Comment">//: Each recipe is stored at a specific page number, or ordinal.</span>
map&lt;recipe_ordinal<span class="Delimiter">,</span> recipe&gt; Recipe<span class="Delimiter">;</span>
<span class="Comment">//: You can also refer to each recipe by its name.</span>
map&lt;string<span class="Delimiter">,</span> recipe_ordinal&gt; Recipe_ordinal<span class="Delimiter">;</span>
recipe_ordinal Next_recipe_ordinal = <span class="Constant">1</span><span class="Delimiter">;</span>

<span class="Comment">//: Ordinals are like numbers, except you can't do arithmetic on them. Ordinal</span>
<span class="Comment">//: 1 is not less than 2, it's just different. Phone numbers are ordinals;</span>
<span class="Comment">//: adding two phone numbers is meaningless. Here each recipe does something</span>
<span class="Comment">//: incommensurable with any other recipe.</span>
<span class="Delimiter">:(after &quot;Types&quot;)</span>
typedef long long int recipe_ordinal<span class="Delimiter">;</span>

<span class="Delimiter">:(before &quot;End Types&quot;)</span>
<span class="Comment">// Recipes are lists of instructions. To perform or 'run' a recipe, the</span>
<span class="Comment">// computer runs its instructions.</span>
struct recipe <span class="Delimiter">{</span>
  string name<span class="Delimiter">;</span>
  vector&lt;instruction&gt; steps<span class="Delimiter">;</span>
  <span class="Comment">// End recipe Fields</span>
  recipe<span class="Delimiter">();</span>
  string to_string<span class="Delimiter">()</span> const<span class="Delimiter">;</span>
<span class="Delimiter">};</span>

<span class="Delimiter">:(before &quot;struct recipe&quot;)</span>
<span class="Comment">// Each instruction is either of the form:</span>
<span class="Comment">//   product1, product2, product3, ... &lt;- operation ingredient1, ingredient2, ingredient3, ...</span>
<span class="Comment">// or just a single 'label' starting with a non-alphanumeric character</span>
<span class="Comment">//   +label</span>
<span class="Comment">// Labels don't do anything, they're just waypoints.</span>
struct instruction <span class="Delimiter">{</span>
  bool is_label<span class="Delimiter">;</span>
  string label<span class="Delimiter">;</span>  <span class="Comment">// only if is_label</span>
  string name<span class="Delimiter">;</span>  <span class="Comment">// only if !is_label</span>
  string old_name<span class="Delimiter">;</span>  <span class="Comment">// before our automatic rewrite rules</span>
  recipe_ordinal operation<span class="Delimiter">;</span>  <span class="Comment">// get(Recipe_ordinal, name)</span>
  vector&lt;reagent&gt; ingredients<span class="Delimiter">;</span>  <span class="Comment">// only if !is_label</span>
  vector&lt;reagent&gt; products<span class="Delimiter">;</span>  <span class="Comment">// only if !is_label</span>
  <span class="Comment">// End instruction Fields</span>
  instruction<span class="Delimiter">();</span>
  void clear<span class="Delimiter">();</span>
  bool is_clear<span class="Delimiter">();</span>
  string to_string<span class="Delimiter">()</span> const<span class="Delimiter">;</span>
<span class="Delimiter">};</span>

<span class="Delimiter">:(before &quot;struct instruction&quot;)</span>
<span class="Comment">// Ingredients and products are a single species -- a reagent. Reagents refer</span>
<span class="Comment">// either to numbers or to locations in memory along with 'type' tags telling</span>
<span class="Comment">// us how to interpret them. They also can contain arbitrary other lists of</span>
<span class="Comment">// properties besides types, but we're getting ahead of ourselves.</span>
struct reagent <span class="Delimiter">{</span>
  string original_string<span class="Delimiter">;</span>
  vector&lt;pair&lt;string<span class="Delimiter">,</span> string_tree*&gt; &gt; properties<span class="Delimiter">;</span>
  string name<span class="Delimiter">;</span>
  double value<span class="Delimiter">;</span>
  bool initialized<span class="Delimiter">;</span>
  type_tree* type<span class="Delimiter">;</span>
  reagent<span class="Delimiter">(</span>string s<span class="Delimiter">);</span>
  reagent<span class="Delimiter">();</span>
  ~reagent<span class="Delimiter">();</span>
  void clear<span class="Delimiter">();</span>
  reagent<span class="Delimiter">(</span>const reagent&amp; old<span class="Delimiter">);</span>
  reagent&amp; operator=<span class="Delimiter">(</span>const reagent&amp; old<span class="Delimiter">);</span>
  void set_value<span class="Delimiter">(</span>double v<span class="Delimiter">)</span> <span class="Delimiter">{</span> value = v<span class="Delimiter">;</span> initialized = <span class="Constant">true</span><span class="Delimiter">;</span> <span class="Delimiter">}</span>
  string to_string<span class="Delimiter">()</span> const<span class="Delimiter">;</span>
<span class="Delimiter">};</span>

<span class="Delimiter">:(before &quot;struct reagent&quot;)</span>
struct property <span class="Delimiter">{</span>
  vector&lt;string&gt; values<span class="Delimiter">;</span>
<span class="Delimiter">};</span>

<span class="Comment">// Types can range from a simple type ordinal, to arbitrarily complex trees of</span>
<span class="Comment">// type parameters, like (map (address array character) (list number))</span>
struct type_tree <span class="Delimiter">{</span>
  type_ordinal value<span class="Delimiter">;</span>
  type_tree* left<span class="Delimiter">;</span>
  type_tree* right<span class="Delimiter">;</span>
  ~type_tree<span class="Delimiter">();</span>
  type_tree<span class="Delimiter">(</span>const type_tree&amp; old<span class="Delimiter">);</span>
  <span class="Comment">// simple: type ordinal</span>
  explicit type_tree<span class="Delimiter">(</span>type_ordinal v<span class="Delimiter">)</span> :value<span class="Delimiter">(</span>v<span class="Delimiter">),</span> left<span class="Delimiter">(</span><span class="Constant">NULL</span><span class="Delimiter">),</span> right<span class="Delimiter">(</span><span class="Constant">NULL</span><span class="Delimiter">)</span> <span class="Delimiter">{}</span>
  <span class="Comment">// intermediate: list of type ordinals</span>
  type_tree<span class="Delimiter">(</span>type_ordinal v<span class="Delimiter">,</span> type_tree* r<span class="Delimiter">)</span> :value<span class="Delimiter">(</span>v<span class="Delimiter">),</span> left<span class="Delimiter">(</span><span class="Constant">NULL</span><span class="Delimiter">),</span> right<span class="Delimiter">(</span>r<span class="Delimiter">)</span> <span class="Delimiter">{}</span>
  <span class="Comment">// advanced: tree containing type ordinals</span>
  type_tree<span class="Delimiter">(</span>type_tree* l<span class="Delimiter">,</span> type_tree* r<span class="Delimiter">)</span> :value<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">),</span> left<span class="Delimiter">(</span>l<span class="Delimiter">),</span> right<span class="Delimiter">(</span>r<span class="Delimiter">)</span> <span class="Delimiter">{}</span>
<span class="Delimiter">};</span>

struct string_tree <span class="Delimiter">{</span>
  string value<span class="Delimiter">;</span>
  string_tree* left<span class="Delimiter">;</span>
  string_tree* right<span class="Delimiter">;</span>
  ~string_tree<span class="Delimiter">();</span>
  string_tree<span class="Delimiter">(</span>const string_tree&amp; old<span class="Delimiter">);</span>
  <span class="Comment">// simple: flat string</span>
  explicit string_tree<span class="Delimiter">(</span>string v<span class="Delimiter">)</span> :value<span class="Delimiter">(</span>v<span class="Delimiter">),</span> left<span class="Delimiter">(</span><span class="Constant">NULL</span><span class="Delimiter">),</span> right<span class="Delimiter">(</span><span class="Constant">NULL</span><span class="Delimiter">)</span> <span class="Delimiter">{}</span>
  <span class="Comment">// intermediate: list of strings</span>
  string_tree<span class="Delimiter">(</span>string v<span class="Delimiter">,</span> string_tree* r<span class="Delimiter">)</span> :value<span class="Delimiter">(</span>v<span class="Delimiter">),</span> left<span class="Delimiter">(</span><span class="Constant">NULL</span><span class="Delimiter">),</span> right<span class="Delimiter">(</span>r<span class="Delimiter">)</span> <span class="Delimiter">{}</span>
  <span class="Comment">// advanced: tree containing strings</span>
  string_tree<span class="Delimiter">(</span>string_tree* l<span class="Delimiter">,</span> string_tree* r<span class="Delimiter">)</span> :left<span class="Delimiter">(</span>l<span class="Delimiter">),</span> right<span class="Delimiter">(</span>r<span class="Delimiter">)</span> <span class="Delimiter">{}</span>
  <span class="Comment">// print as s-expression</span>
  string to_string<span class="Delimiter">()</span> const<span class="Delimiter">;</span>
<span class="Delimiter">};</span>

<span class="Delimiter">:(before &quot;End Globals&quot;)</span>
<span class="Comment">// Locations refer to a common 'memory'. Each location can store a number.</span>
map&lt;long long int<span class="Delimiter">,</span> double&gt; Memory<span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End Setup&quot;)</span>
Memory<span class="Delimiter">.</span>clear<span class="Delimiter">();</span>

<span class="Delimiter">:(after &quot;Types&quot;)</span>
<span class="Comment">// Mu types encode how the numbers stored in different parts of memory are</span>
<span class="Comment">// interpreted. A location tagged as a 'character' type will interpret the</span>
<span class="Comment">// value 97 as the letter 'a', while a different location of type 'number'</span>
<span class="Comment">// would not.</span>
<span class="Comment">//</span>
<span class="Comment">// Unlike most computers today, mu stores types in a single big table, shared</span>
<span class="Comment">// by all the mu programs on the computer. This is useful in providing a</span>
<span class="Comment">// seamless experience to help understand arbitrary mu programs.</span>
typedef long long int type_ordinal<span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End Globals&quot;)</span>
map&lt;string<span class="Delimiter">,</span> type_ordinal&gt; Type_ordinal<span class="Delimiter">;</span>
map&lt;type_ordinal<span class="Delimiter">,</span> type_info&gt; Type<span class="Delimiter">;</span>
type_ordinal Next_type_ordinal = <span class="Constant">1</span><span class="Delimiter">;</span>
<span class="Delimiter">:(code)</span>
void setup_types<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  Type<span class="Delimiter">.</span>clear<span class="Delimiter">();</span>  Type_ordinal<span class="Delimiter">.</span>clear<span class="Delimiter">();</span>
  put<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;literal&quot;</span><span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
  Next_type_ordinal = <span class="Constant">1</span><span class="Delimiter">;</span>
  <span class="Comment">// Mu Types Initialization</span>
  type_ordinal number = put<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;number&quot;</span><span class="Delimiter">,</span> Next_type_ordinal++<span class="Delimiter">);</span>
  put<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;location&quot;</span><span class="Delimiter">,</span> get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;number&quot;</span><span class="Delimiter">));</span>  <span class="Comment">// wildcard type: either a pointer or a scalar</span>
  get_or_insert<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> number<span class="Delimiter">).</span>name = <span class="Constant">&quot;number&quot;</span><span class="Delimiter">;</span>
  type_ordinal address = put<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;address&quot;</span><span class="Delimiter">,</span> Next_type_ordinal++<span class="Delimiter">);</span>
  get_or_insert<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> address<span class="Delimiter">).</span>name = <span class="Constant">&quot;address&quot;</span><span class="Delimiter">;</span>
  type_ordinal boolean = put<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;boolean&quot;</span><span class="Delimiter">,</span> Next_type_ordinal++<span class="Delimiter">);</span>
  get_or_insert<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> boolean<span class="Delimiter">).</span>name = <span class="Constant">&quot;boolean&quot;</span><span class="Delimiter">;</span>
  type_ordinal character = put<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;character&quot;</span><span class="Delimiter">,</span> Next_type_ordinal++<span class="Delimiter">);</span>
  get_or_insert<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> character<span class="Delimiter">).</span>name = <span class="Constant">&quot;character&quot;</span><span class="Delimiter">;</span>
  <span class="Comment">// Array types are a special modifier to any other type. For example,</span>
  <span class="Comment">// array:number or array:address:boolean.</span>
  type_ordinal array = put<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;array&quot;</span><span class="Delimiter">,</span> Next_type_ordinal++<span class="Delimiter">);</span>
  get_or_insert<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> array<span class="Delimiter">).</span>name = <span class="Constant">&quot;array&quot;</span><span class="Delimiter">;</span>
  <span class="Comment">// End Mu Types Initialization</span>
<span class="Delimiter">}</span>
void teardown_types<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  for <span class="Delimiter">(</span>map&lt;type_ordinal<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>
    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>p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span>elements<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span>
      delete p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
  <span class="Delimiter">}</span>
  Type_ordinal<span class="Delimiter">.</span>clear<span class="Delimiter">();</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before &quot;End One-time Setup&quot;)</span>
setup_types<span class="Delimiter">();</span>
atexit<span class="Delimiter">(</span>teardown_types<span class="Delimiter">);</span>

<span class="Delimiter">:(before &quot;End Types&quot;)</span>
<span class="Comment">// You can construct arbitrary new types. New types are either 'containers'</span>
<span class="Comment">// with multiple 'elements' of other types, or 'exclusive containers' containing</span>
<span class="Comment">// one of multiple 'variants'. (These are similar to C structs and unions,</span>
<span class="Comment">// respectively, though exclusive containers implicitly include a tag element</span>
<span class="Comment">// recording which variant they should be interpreted as.)</span>
<span class="Comment">//</span>
<span class="Comment">// For example, storing bank balance and name for an account might require a</span>
<span class="Comment">// container, but if bank accounts may be either for individuals or groups,</span>
<span class="Comment">// with different properties for each, that may require an exclusive container</span>
<span class="Comment">// whose variants are individual-account and joint-account containers.</span>
enum kind_of_type <span class="Delimiter">{</span>
  PRIMITIVE<span class="Delimiter">,</span>
  CONTAINER<span class="Delimiter">,</span>
  EXCLUSIVE_CONTAINER
<span class="Delimiter">};</span>

struct type_info <span class="Delimiter">{</span>
  string name<span class="Delimiter">;</span>
  kind_of_type kind<span class="Delimiter">;</span>
  long long int size<span class="Delimiter">;</span>  <span class="Comment">// only if type is not primitive; primitives and addresses have size 1 (except arrays are dynamic)</span>
  vector&lt;type_tree*&gt; elements<span class="Delimiter">;</span>
  vector&lt;string&gt; element_names<span class="Delimiter">;</span>
  <span class="Comment">// End type_info Fields</span>
  type_info<span class="Delimiter">()</span> :kind<span class="Delimiter">(</span>PRIMITIVE<span class="Delimiter">),</span> size<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{}</span>
<span class="Delimiter">};</span>

enum primitive_recipes <span class="Delimiter">{</span>
  IDLE = <span class="Constant">0</span><span class="Delimiter">,</span>
  COPY<span class="Delimiter">,</span>
  <span class="Comment">// End Primitive Recipe Declarations</span>
  MAX_PRIMITIVE_RECIPES<span class="Delimiter">,</span>
<span class="Delimiter">};</span>
<span class="Delimiter">:(code)</span>
<span class="Comment">//: It's all very well to construct recipes out of other recipes, but we need</span>
<span class="Comment">//: to know how to do *something* out of the box. For the following</span>
<span class="Comment">//: recipes there are only codes, no entries in the book, because mu just knows</span>
<span class="Comment">//: what to do for them.</span>
void setup_recipes<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  Recipe<span class="Delimiter">.</span>clear<span class="Delimiter">();</span>  Recipe_ordinal<span class="Delimiter">.</span>clear<span class="Delimiter">();</span>
  put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;idle&quot;</span><span class="Delimiter">,</span> IDLE<span class="Delimiter">);</span>
  <span class="Comment">// Primitive Recipe Numbers</span>
  put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;copy&quot;</span><span class="Delimiter">,</span> COPY<span class="Delimiter">);</span>
  <span class="Comment">// End Primitive Recipe Numbers</span>
<span class="Delimiter">}</span>
<span class="Comment">//: We could just reset the recipe table after every test, but that gets slow</span>
<span class="Comment">//: all too quickly. Instead, initialize the common stuff just once at</span>
<span class="Comment">//: startup. Later layers will carefully undo each test's additions after</span>
<span class="Comment">//: itself.</span>
<span class="Delimiter">:(before &quot;End One-time Setup&quot;)</span>
setup_recipes<span class="Delimiter">();</span>
assert<span class="Delimiter">(</span>MAX_PRIMITIVE_RECIPES &lt; <span class="Constant">200</span><span class="Delimiter">);</span>  <span class="Comment">// level 0 is primitives; until 199</span>
Next_recipe_ordinal = <span class="Constant">200</span><span class="Delimiter">;</span>
put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;main&quot;</span><span class="Delimiter">,</span> Next_recipe_ordinal++<span class="Delimiter">);</span>
<span class="Comment">// End Load Recipes</span>
<span class="Delimiter">:(before &quot;End Test Run Initialization&quot;)</span>
assert<span class="Delimiter">(</span>Next_recipe_ordinal &lt; <span class="Constant">1000</span><span class="Delimiter">);</span>  <span class="Comment">// recipes being tested didn't overflow into test space</span>
<span class="Delimiter">:(before &quot;End Setup&quot;)</span>
Next_recipe_ordinal = <span class="Constant">1000</span><span class="Delimiter">;</span>  <span class="Comment">// consistent new numbers for each test</span>

^L

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

<span class="Delimiter">:(code)</span>
recipe::recipe<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  <span class="Comment">// End recipe Constructor</span>
<span class="Delimiter">}</span>

instruction::instruction<span class="Delimiter">()</span> :is_label<span class="Delimiter">(</span><span class="Constant">false</span><span class="Delimiter">),</span> operation<span class="Delimiter">(</span>IDLE<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Comment">// End instruction Constructor</span>
<span class="Delimiter">}</span>
void instruction::clear<span class="Delimiter">()</span> <span class="Delimiter">{</span> is_label=<span class="Constant">false</span><span class="Delimiter">;</span> label<span class="Delimiter">.</span>clear<span class="Delimiter">();</span> name<span class="Delimiter">.</span>clear<span class="Delimiter">();</span> old_name<span class="Delimiter">.</span>clear<span class="Delimiter">();</span> operation=IDLE<span class="Delimiter">;</span> ingredients<span class="Delimiter">.</span>clear<span class="Delimiter">();</span> products<span class="Delimiter">.</span>clear<span class="Delimiter">();</span> <span class="Delimiter">}</span>
bool instruction::is_clear<span class="Delimiter">()</span> <span class="Delimiter">{</span> <span class="Identifier">return</span> !is_label &amp;&amp; name<span class="Delimiter">.</span>empty<span class="Delimiter">();</span> <span class="Delimiter">}</span>

<span class="Comment">// Reagents have the form &lt;name&gt;:&lt;type&gt;:&lt;type&gt;:.../&lt;property&gt;/&lt;property&gt;/...</span>
reagent::reagent<span class="Delimiter">(</span>string s<span class="Delimiter">)</span> :original_string<span class="Delimiter">(</span>s<span class="Delimiter">),</span> value<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">),</span> initialized<span class="Delimiter">(</span><span class="Constant">false</span><span class="Delimiter">),</span> type<span class="Delimiter">(</span><span class="Constant">NULL</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Comment">// Parsing reagent(string s)</span>
  istringstream in<span class="Delimiter">(</span>s<span class="Delimiter">);</span>
  in &gt;&gt; std::noskipws<span class="Delimiter">;</span>
  <span class="Comment">// properties</span>
  while <span class="Delimiter">(</span>has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
    istringstream row<span class="Delimiter">(</span>slurp_until<span class="Delimiter">(</span>in<span class="Delimiter">,</span> <span class="Constant">'/'</span><span class="Delimiter">));</span>
    row &gt;&gt; std::noskipws<span class="Delimiter">;</span>
    string key = slurp_until<span class="Delimiter">(</span>row<span class="Delimiter">,</span> <span class="Constant">':'</span><span class="Delimiter">);</span>
    string_tree* value = parse_property_list<span class="Delimiter">(</span>row<span class="Delimiter">);</span>
    properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span>key<span class="Delimiter">,</span> value<span class="Delimiter">));</span>
  <span class="Delimiter">}</span>
  <span class="Comment">// structures for the first row of properties: name and list of types</span>
  name = properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>first<span class="Delimiter">;</span>
  type = new_type_tree<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>
  if <span class="Delimiter">(</span>is_integer<span class="Delimiter">(</span>name<span class="Delimiter">)</span> &amp;&amp; type == <span class="Constant">NULL</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
    assert<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>
    properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>second = new string_tree<span class="Delimiter">(</span><span class="Constant">&quot;literal&quot;</span><span class="Delimiter">);</span>
    type = new type_tree<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;literal&quot;</span><span class="Delimiter">));</span>
  <span class="Delimiter">}</span>
  if <span class="Delimiter">(</span>name == <span class="Constant">&quot;_&quot;</span> &amp;&amp; type == <span class="Constant">NULL</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
    assert<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>
    properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>second = new string_tree<span class="Delimiter">(</span><span class="Constant">&quot;dummy&quot;</span><span class="Delimiter">);</span>
    type = new type_tree<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;literal&quot;</span><span class="Delimiter">));</span>
  <span class="Delimiter">}</span>
  <span class="Comment">// End Parsing reagent</span>
<span class="Delimiter">}</span>

string_tree* parse_property_list<span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
  if <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">NULL</span><span class="Delimiter">;</span>
  string_tree* result = new string_tree<span class="Delimiter">(</span>slurp_until<span class="Delimiter">(</span>in<span class="Delimiter">,</span> <span class="Constant">':'</span><span class="Delimiter">));</span>
  result<span class="Delimiter">-&gt;</span>right = parse_property_list<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

type_tree* new_type_tree<span class="Delimiter">(</span>const string_tree* properties<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  if <span class="Delimiter">(</span>!properties<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">NULL</span><span class="Delimiter">;</span>
  type_tree* result = new type_tree<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
  if <span class="Delimiter">(</span>!properties<span class="Delimiter">-&gt;</span>value<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
    const string&amp; type_name = properties<span class="Delimiter">-&gt;</span>value<span class="Delimiter">;</span>
    if <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type_name<span class="Delimiter">))</span>
      result<span class="Delimiter">-&gt;</span>value = get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type_name<span class="Delimiter">);</span>
    else if <span class="Delimiter">(</span>is_integer<span class="Delimiter">(</span>type_name<span class="Delimiter">))</span>  <span class="Comment">// sometimes types will contain non-type tags, like numbers for the size of an array</span>
      result<span class="Delimiter">-&gt;</span>value = <span class="Constant">0</span><span class="Delimiter">;</span>
    else if <span class="Delimiter">(</span>properties<span class="Delimiter">-&gt;</span>value != <span class="Constant">&quot;-&gt;&quot;</span><span class="Delimiter">)</span>  <span class="Comment">// used in recipe types</span>
      result<span class="Delimiter">-&gt;</span>value = -<span class="Constant">1</span><span class="Delimiter">;</span>  <span class="Comment">// should never happen; will trigger errors later</span>
  <span class="Delimiter">}</span>
  result<span class="Delimiter">-&gt;</span>left = new_type_tree<span class="Delimiter">(</span>properties<span class="Delimiter">-&gt;</span>left<span class="Delimiter">);</span>
  result<span class="Delimiter">-&gt;</span>right = new_type_tree<span class="Delimiter">(</span>properties<span class="Delimiter">-&gt;</span>right<span class="Delimiter">);</span>
  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Comment">//: avoid memory leaks for the type tree</span>

reagent::reagent<span class="Delimiter">(</span>const reagent&amp; old<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  original_string = old<span class="Delimiter">.</span>original_string<span class="Delimiter">;</span>
  name = old<span class="Delimiter">.</span>name<span class="Delimiter">;</span>
  value = old<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
  initialized = old<span class="Delimiter">.</span>initialized<span class="Delimiter">;</span>
  properties<span class="Delimiter">.</span>clear<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>old<span class="Delimiter">.</span>properties<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span>old<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first<span class="Delimiter">,</span>
                                                    old<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second ? new string_tree<span class="Delimiter">(</span>*old<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">)</span> : <span class="Constant">NULL</span><span class="Delimiter">));</span>
  <span class="Delimiter">}</span>
  type = old<span class="Delimiter">.</span>type ? new type_tree<span class="Delimiter">(</span>*old<span class="Delimiter">.</span>type<span class="Delimiter">)</span> : <span class="Constant">NULL</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

type_tree::type_tree<span class="Delimiter">(</span>const type_tree&amp; old<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  value = old<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
  left = old<span class="Delimiter">.</span>left ? new type_tree<span class="Delimiter">(</span>*old<span class="Delimiter">.</span>left<span class="Delimiter">)</span> : <span class="Constant">NULL</span><span class="Delimiter">;</span>
  right = old<span class="Delimiter">.</span>right ? new type_tree<span class="Delimiter">(</span>*old<span class="Delimiter">.</span>right<span class="Delimiter">)</span> : <span class="Constant">NULL</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

string_tree::string_tree<span class="Delimiter">(</span>const string_tree&amp; old<span class="Delimiter">)</span> <span class="Delimiter">{</span>  <span class="Comment">// :value(old.value) {</span>
  value = old<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
  left = old<span class="Delimiter">.</span>left ? new string_tree<span class="Delimiter">(</span>*old<span class="Delimiter">.</span>left<span class="Delimiter">)</span> : <span class="Constant">NULL</span><span class="Delimiter">;</span>
  right = old<span class="Delimiter">.</span>right ? new string_tree<span class="Delimiter">(</span>*old<span class="Delimiter">.</span>right<span class="Delimiter">)</span> : <span class="Constant">NULL</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

reagent&amp; reagent::operator=<span class="Delimiter">(</span>const reagent&amp; old<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  original_string = old<span class="Delimiter">.</span>original_string<span class="Delimiter">;</span>
  properties<span class="Delimiter">.</span>clear<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>old<span class="Delimiter">.</span>properties<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span>
    properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span>old<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first<span class="Delimiter">,</span> old<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second ? new string_tree<span class="Delimiter">(</span>*old<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">)</span> : <span class="Constant">NULL</span><span class="Delimiter">));</span>
  name = old<span class="Delimiter">.</span>name<span class="Delimiter">;</span>
  value = old<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
  initialized = old<span class="Delimiter">.</span>initialized<span class="Delimiter">;</span>
  type = old<span class="Delimiter">.</span>type ? new type_tree<span class="Delimiter">(</span>*old<span class="Delimiter">.</span>type<span class="Delimiter">)</span> : <span class="Constant">NULL</span><span class="Delimiter">;</span>
  <span class="Identifier">return</span> *this<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

reagent::~reagent<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  clear<span class="Delimiter">();</span>
<span class="Delimiter">}</span>

void reagent::clear<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>properties<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    if <span class="Delimiter">(</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">)</span> <span class="Delimiter">{</span>
      delete properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">;</span>
      properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second = <span class="Constant">NULL</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  delete type<span class="Delimiter">;</span>
  type = <span class="Constant">NULL</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
type_tree::~type_tree<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  delete left<span class="Delimiter">;</span>
  delete right<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
string_tree::~string_tree<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  delete left<span class="Delimiter">;</span>
  delete right<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

reagent::reagent<span class="Delimiter">()</span> :value<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">),</span> initialized<span class="Delimiter">(</span><span class="Constant">false</span><span class="Delimiter">),</span> type<span class="Delimiter">(</span><span class="Constant">NULL</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Comment">// The first property is special, so ensure we always have it.</span>
  <span class="Comment">// Other properties can be pushed back, but the first must always be</span>
  <span class="Comment">// assigned to.</span>
  properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span><span class="Constant">&quot;&quot;</span><span class="Delimiter">,</span> <span class="Constant">NULL</span><span class="Delimiter">));</span>
<span class="Delimiter">}</span>

string reagent::to_string<span class="Delimiter">()</span> const <span class="Delimiter">{</span>
  ostringstream out<span class="Delimiter">;</span>
  if <span class="Delimiter">(</span>!properties<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
    out &lt;&lt; <span class="Constant">&quot;{&quot;</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>properties<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
      if <span class="Delimiter">(</span>i &gt; <span class="Constant">0</span><span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">&quot;, &quot;</span><span class="Delimiter">;</span>
      out &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\&quot;</span><span class="Constant">&quot;</span> &lt;&lt; properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\&quot;</span><span class="Constant">: &quot;</span> &lt;&lt; debug_string<span class="Delimiter">(</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">);</span>
    <span class="Delimiter">}</span>
    out &lt;&lt; <span class="Constant">&quot;}&quot;</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span class="Delimiter">}</span>

string debug_string<span class="Delimiter">(</span>const reagent&amp; x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  ostringstream out<span class="Delimiter">;</span>
  out &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; debug_string<span class="Delimiter">(</span>x<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; -- &quot;</span> &lt;&lt; x<span class="Delimiter">.</span>to_string<span class="Delimiter">();</span>
  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span class="Delimiter">}</span>

string debug_string<span class="Delimiter">(</span>const string_tree* property<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  if <span class="Delimiter">(</span>!property<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">&quot;&lt;&gt;&quot;</span><span class="Delimiter">;</span>
  ostringstream out<span class="Delimiter">;</span>
  if <span class="Delimiter">(</span>!property<span class="Delimiter">-&gt;</span>left &amp;&amp; !property<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span>
    <span class="Comment">// abbreviate a single-node tree to just its contents</span>
    out &lt;&lt; <span class="Constant">'&quot;'</span> &lt;&lt; property<span class="Delimiter">-&gt;</span>value &lt;&lt; <span class="Constant">'&quot;'</span><span class="Delimiter">;</span>
  else
    dump_property_tree<span class="Delimiter">(</span>property<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span class="Delimiter">}</span>

void dump_property_tree<span class="Delimiter">(</span>const string_tree* property<span class="Delimiter">,</span> ostream&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  out &lt;&lt; <span class="Constant">&quot;&lt;&quot;</span><span class="Delimiter">;</span>
  if <span class="Delimiter">(</span>property<span class="Delimiter">-&gt;</span>left<span class="Delimiter">)</span>
    dump_property_tree<span class="Delimiter">(</span>property<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
  else
    out &lt;&lt; <span class="Constant">'&quot;'</span> &lt;&lt; property<span class="Delimiter">-&gt;</span>value &lt;&lt; <span class="Constant">'&quot;'</span><span class="Delimiter">;</span>
  out &lt;&lt; <span class="Constant">&quot; : &quot;</span><span class="Delimiter">;</span>
  if <span class="Delimiter">(</span>property<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span>
    dump_property_tree<span class="Delimiter">(</span>property<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
  else
    out &lt;&lt; <span class="Constant">&quot;&lt;&gt;&quot;</span><span class="Delimiter">;</span>
  out &lt;&lt; <span class="Constant">&quot;&gt;&quot;</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

string debug_string<span class="Delimiter">(</span>const type_tree* type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Comment">// abbreviate a single-node tree to just its contents</span>
  if <span class="Delimiter">(</span>!type<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">&quot;NULLNULLNULL&quot;</span><span class="Delimiter">;</span>  <span class="Comment">// should never happen</span>
  ostringstream out<span class="Delimiter">;</span>
  if <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>left &amp;&amp; !type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span>
    dump_type_name<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
  else
    dump_types_tree<span class="Delimiter">(</span>type<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span class="Delimiter">}</span>

void dump_types_tree<span class="Delimiter">(</span>const type_tree* type<span class="Delimiter">,</span> ostream&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  out &lt;&lt; <span class="Constant">&quot;&lt;&quot;</span><span class="Delimiter">;</span>
  if <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">)</span>
    dump_types_tree<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
  else
    dump_type_name<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
  out &lt;&lt; <span class="Constant">&quot; : &quot;</span><span class="Delimiter">;</span>
  if <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span>
    dump_types_tree<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
  else
    out &lt;&lt; <span class="Constant">&quot;&lt;&gt;&quot;</span><span class="Delimiter">;</span>
  out &lt;&lt; <span class="Constant">&quot;&gt;&quot;</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

void dump_type_name<span class="Delimiter">(</span>type_ordinal type<span class="Delimiter">,</span> ostream&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  if <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> type<span class="Delimiter">))</span>
    out &lt;&lt; get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> type<span class="Delimiter">).</span>name<span class="Delimiter">;</span>
  else
    out &lt;&lt; <span class="Constant">&quot;?&quot;</span> &lt;&lt; type<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

string instruction::to_string<span class="Delimiter">()</span> const <span class="Delimiter">{</span>
  if <span class="Delimiter">(</span>is_label<span class="Delimiter">)</span> <span class="Identifier">return</span> label<span class="Delimiter">;</span>
  ostringstream out<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>products<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    if <span class="Delimiter">(</span>i &gt; <span class="Constant">0</span><span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">&quot;, &quot;</span><span class="Delimiter">;</span>
    out &lt;&lt; products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string<span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  if <span class="Delimiter">(</span>!products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> out &lt;&lt; <span class="Constant">&quot; &lt;- &quot;</span><span class="Delimiter">;</span>
  out &lt;&lt; name &lt;&lt; <span class="Constant">' '</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>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    if <span class="Delimiter">(</span>i &gt; <span class="Constant">0</span><span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">&quot;, &quot;</span><span class="Delimiter">;</span>
    out &lt;&lt; ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string<span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span class="Delimiter">}</span>

string debug_string<span class="Delimiter">(</span>const recipe&amp; x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  ostringstream out<span class="Delimiter">;</span>
  out &lt;&lt; <span class="Constant">&quot;- recipe &quot;</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
  <span class="Comment">// Begin debug_string(recipe x)</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>x<span class="Delimiter">.</span>steps<span class="Delimiter">);</span> ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    const instruction&amp; inst = x<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
    out &lt;&lt; <span class="Constant">&quot;inst: &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>to_string<span class="Delimiter">()</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
    out &lt;&lt; <span class="Constant">&quot;  ingredients</span><span class="cSpecial">\n</span><span class="Constant">&quot;</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>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span>
      out &lt;&lt; <span class="Constant">&quot;    &quot;</span> &lt;&lt; debug_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<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>
    out &lt;&lt; <span class="Constant">&quot;  products</span><span class="cSpecial">\n</span><span class="Constant">&quot;</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>
      out &lt;&lt; <span class="Constant">&quot;    &quot;</span> &lt;&lt; debug_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<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="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span class="Delimiter">}</span>

string slurp_until<span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">,</span> char delim<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  ostringstream out<span class="Delimiter">;</span>
  char c<span class="Delimiter">;</span>
  while <span class="Delimiter">(</span>in &gt;&gt; c<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    if <span class="Delimiter">(</span>c == delim<span class="Delimiter">)</span> <span class="Delimiter">{</span>
      <span class="Comment">// drop the delim</span>
      <span class="Identifier">break</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
    out &lt;&lt; c<span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span class="Delimiter">}</span>

bool has_property<span class="Delimiter">(</span>reagent x<span class="Delimiter">,</span> string name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  for <span class="Delimiter">(</span>long long int i = <span class="Comment">/*</span><span class="Comment">skip name:type</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    if <span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first == name<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

string_tree* property<span class="Delimiter">(</span>const reagent&amp; r<span class="Delimiter">,</span> const string&amp; name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  for <span class="Delimiter">(</span>long long int p = <span class="Comment">/*</span><span class="Comment">skip name:type</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span> p != SIZE<span class="Delimiter">(</span>r<span class="Delimiter">.</span>properties<span class="Delimiter">);</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    if <span class="Delimiter">(</span>r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>p<span class="Delimiter">).</span>first == name<span class="Delimiter">)</span>
      <span class="Identifier">return</span> r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>p<span class="Delimiter">).</span>second<span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">return</span> <span class="Constant">NULL</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

void dump_memory<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  for <span class="Delimiter">(</span>map&lt;long long int<span class="Delimiter">,</span> double&gt;::iterator p = Memory<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != Memory<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    cout &lt;&lt; p<span class="Delimiter">-&gt;</span>first &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

string recipe::to_string<span class="Delimiter">()</span> const <span class="Delimiter">{</span>
  ostringstream out<span class="Delimiter">;</span>
  out &lt;&lt; <span class="Constant">&quot;recipe &quot;</span> &lt;&lt; name &lt;&lt; <span class="Constant">&quot; [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</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>steps<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span>
    out &lt;&lt; <span class="Constant">&quot;  &quot;</span> &lt;&lt; steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>to_string<span class="Delimiter">()</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
  out &lt;&lt; <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span class="Delimiter">}</span>

string string_tree::to_string<span class="Delimiter">()</span> const <span class="Delimiter">{</span>
  ostringstream out<span class="Delimiter">;</span>
  dump<span class="Delimiter">(</span>this<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span class="Delimiter">}</span>

void dump<span class="Delimiter">(</span>const string_tree* x<span class="Delimiter">,</span> ostream&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  if <span class="Delimiter">(</span>!x<span class="Delimiter">-&gt;</span>left &amp;&amp; !x<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    out &lt;&lt; x<span class="Delimiter">-&gt;</span>value<span class="Delimiter">;</span>
    <span class="Identifier">return</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  out &lt;&lt; <span class="Constant">'('</span><span class="Delimiter">;</span>
  for <span class="Delimiter">(</span>const string_tree* curr = x<span class="Delimiter">;</span> curr<span class="Delimiter">;</span> curr = curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    if <span class="Delimiter">(</span>curr != x<span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
    if <span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>left<span class="Delimiter">)</span>
      dump<span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
    else
      out &lt;&lt; curr<span class="Delimiter">-&gt;</span>value<span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  out &lt;&lt; <span class="Constant">')'</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(before &quot;End Globals&quot;)</span>
const string Ignore<span class="Delimiter">(</span><span class="Constant">&quot;,&quot;</span><span class="Delimiter">);</span>  <span class="Comment">// commas are ignored in mu except within [] strings</span>
<span class="Delimiter">:(code)</span>
void skip_whitespace_but_not_newline<span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  while <span class="Delimiter">(</span><span class="Constant">true</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
    if <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
    else if <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
    else if <span class="Delimiter">(</span>isspace<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()))</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
    else if <span class="Delimiter">(</span>Ignore<span class="Delimiter">.</span>find<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">())</span> != string::npos<span class="Delimiter">)</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
    else <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(before &quot;End Types&quot;)</span>
struct no_scientific <span class="Delimiter">{</span>
  double x<span class="Delimiter">;</span>
  explicit no_scientific<span class="Delimiter">(</span>double y<span class="Delimiter">)</span> :x<span class="Delimiter">(</span>y<span class="Delimiter">)</span> <span class="Delimiter">{}</span>
<span class="Delimiter">};</span>

<span class="Delimiter">:(code)</span>
ostream&amp; operator&lt;&lt;<span class="Delimiter">(</span>ostream&amp; os<span class="Delimiter">,</span> no_scientific x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  if <span class="Delimiter">(</span>!isfinite<span class="Delimiter">(</span>x<span class="Delimiter">.</span>x<span class="Delimiter">))</span> <span class="Delimiter">{</span>
    <span class="Comment">// Infinity or NaN</span>
    os &lt;&lt; x<span class="Delimiter">.</span>x<span class="Delimiter">;</span>
    <span class="Identifier">return</span> os<span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  ostringstream tmp<span class="Delimiter">;</span>
  tmp &lt;&lt; std::fixed &lt;&lt; x<span class="Delimiter">.</span>x<span class="Delimiter">;</span>
  os &lt;&lt; trim_floating_point<span class="Delimiter">(</span>tmp<span class="Delimiter">.</span>str<span class="Delimiter">());</span>
  <span class="Identifier">return</span> os<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

string trim_floating_point<span class="Delimiter">(</span>const string&amp; in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  if <span class="Delimiter">(</span>in<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">;</span>
  long long int len = SIZE<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
  while <span class="Delimiter">(</span>len &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
    if <span class="Delimiter">(</span>in<span class="Delimiter">.</span>at<span class="Delimiter">(</span>len-<span class="Constant">1</span><span class="Delimiter">)</span> != <span class="Constant">'0'</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
    --len<span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  if <span class="Delimiter">(</span>in<span class="Delimiter">.</span>at<span class="Delimiter">(</span>len-<span class="Constant">1</span><span class="Delimiter">)</span> == <span class="Constant">'.'</span><span class="Delimiter">)</span> --len<span class="Delimiter">;</span>
<span class="CommentedCode">//?   cerr &lt;&lt; in &lt;&lt; &quot;: &quot; &lt;&lt; in.substr(0, len) &lt;&lt; '\n';</span>
  <span class="Identifier">return</span> in<span class="Delimiter">.</span>substr<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">,</span> len<span class="Delimiter">);</span>
<span class="Delimiter">}</span>

void test_trim_floating_point<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  CHECK_EQ<span class="Delimiter">(</span><span class="Constant">&quot;&quot;</span><span class="Delimiter">,</span> trim_floating_point<span class="Delimiter">(</span><span class="Constant">&quot;&quot;</span><span class="Delimiter">));</span>
  CHECK_EQ<span class="Delimiter">(</span><span class="Constant">&quot;0&quot;</span><span class="Delimiter">,</span> trim_floating_point<span class="Delimiter">(</span><span class="Constant">&quot;000000000&quot;</span><span class="Delimiter">));</span>
  CHECK_EQ<span class="Delimiter">(</span><span class="Constant">&quot;1.5&quot;</span><span class="Delimiter">,</span> trim_floating_point<span class="Delimiter">(</span><span class="Constant">&quot;1.5000&quot;</span><span class="Delimiter">));</span>
  CHECK_EQ<span class="Delimiter">(</span><span class="Constant">&quot;1.000001&quot;</span><span class="Delimiter">,</span> trim_floating_point<span class="Delimiter">(</span><span class="Constant">&quot;1.000001&quot;</span><span class="Delimiter">));</span>
  CHECK_EQ<span class="Delimiter">(</span><span class="Constant">&quot;23&quot;</span><span class="Delimiter">,</span> trim_floating_point<span class="Delimiter">(</span><span class="Constant">&quot;23.000000&quot;</span><span class="Delimiter">));</span>
  CHECK_EQ<span class="Delimiter">(</span><span class="Constant">&quot;23&quot;</span><span class="Delimiter">,</span> trim_floating_point<span class="Delimiter">(</span><span class="Constant">&quot;23.0&quot;</span><span class="Delimiter">));</span>
  CHECK_EQ<span class="Delimiter">(</span><span class="Constant">&quot;23&quot;</span><span class="Delimiter">,</span> trim_floating_point<span class="Delimiter">(</span><span class="Constant">&quot;23.&quot;</span><span class="Delimiter">));</span>
  CHECK_EQ<span class="Delimiter">(</span><span class="Constant">&quot;23&quot;</span><span class="Delimiter">,</span> trim_floating_point<span class="Delimiter">(</span><span class="Constant">&quot;23&quot;</span><span class="Delimiter">));</span>
  CHECK_EQ<span class="Delimiter">(</span><span class="Constant">&quot;3&quot;</span><span class="Delimiter">,</span> trim_floating_point<span class="Delimiter">(</span><span class="Constant">&quot;3.000000&quot;</span><span class="Delimiter">));</span>
  CHECK_EQ<span class="Delimiter">(</span><span class="Constant">&quot;3&quot;</span><span class="Delimiter">,</span> trim_floating_point<span class="Delimiter">(</span><span class="Constant">&quot;3.0&quot;</span><span class="Delimiter">));</span>
  CHECK_EQ<span class="Delimiter">(</span><span class="Constant">&quot;3&quot;</span><span class="Delimiter">,</span> trim_floating_point<span class="Delimiter">(</span><span class="Constant">&quot;3.&quot;</span><span class="Delimiter">));</span>
  CHECK_EQ<span class="Delimiter">(</span><span class="Constant">&quot;3&quot;</span><span class="Delimiter">,</span> trim_floating_point<span class="Delimiter">(</span><span class="Constant">&quot;3&quot;</span><span class="Delimiter">));</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(before &quot;End Includes&quot;)</span>
<span class="PreProc">#include</span><span class="Constant">&lt;utility&gt;</span>
using std::pair<span class="Delimiter">;</span>
<span class="PreProc">#include</span><span class="Constant">&lt;math.h&gt;</span>
</pre>
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