//: Spaces help isolate recipes from each other. You can create them at will,
//: and all addresses in arguments are implicitly based on the 'default-space'
//: (unless they have the /raw property)

:(scenario set_default_space)
# if default-space is 10, and if an array of 5 locals lies from location 11 to 15 (inclusive),
# then location 0 is really location 11, location 1 is really location 12, and so on.
recipe main [
  10:number <- copy 5  # pretend array; in practice we'll use new
  default-space:address:array:location <- copy 10
  1:number <- copy 23
]
+mem: storing 23 in location 12

:(scenario lookup_sidesteps_default_space)
recipe main [
  # pretend pointer from outside
  3:number <- copy 34
  # pretend array
  1000:number <- copy 5
  # actual start of this recipe
  default-space:address:array:location <- copy 1000
  1:address:number <- copy 3
  8:number/raw <- copy *1:address:number
]
+mem: storing 34 in location 8

//:: first disable name conversion for 'default-space'
:(scenario convert_names_passes_default_space)
recipe main [
  default-space:number, x:number <- copy 0, 1
]
+name: assign x 1
-name: assign default-space 1

:(before "End Disqualified Reagents")
if (x.name == "default-space")
  x.initialized = true;
:(before "End is_special_name Cases")
if (s == "default-space") return true;

//:: now implement space support
:(before "End call Fields")
long long int default_space;
:(before "End call Constructor")
default_space = 0;

:(replace "reagent r = x" following "reagent canonize(reagent x)")
reagent r = absolutize(x);
:(code)
reagent absolutize(reagent x) {
//?   cout << "absolutize " << x.to_string() << '\n'; //? 4
  if (is_raw(x) || is_dummy(x)) return x;
  if (!x.initialized) {
    raise << current_instruction().to_string() << ": reagent not initialized: " << x.original_string << end();
    return x;
  }
  reagent r = x;
  r.set_value(address(r.value, space_base(r)));
  r.properties.push_back(pair<string, vector<string> >("raw", vector<string>()));
  assert(is_raw(r));
  return r;
}
:(before "return result" following "reagent lookup_memory(reagent x)")
result.properties.push_back(pair<string, vector<string> >("raw", vector<string>()));

//:: fix 'get'

:(scenario lookup_sidesteps_default_space_in_get)
recipe main [
  # pretend pointer to container from outside
  12:number <- copy 34
  13:number <- copy 35
  # pretend array
  1000:number <- copy 5
  # actual start of this recipe
  default-space:address:array:location <- copy 1000
  1:address:point <- copy 12
  9:number/raw <- get *1:address:point, pre { line-height: 125%; }
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