033length.cc


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//: Recipe to compute the length of an array.

:(scenario array_length)
recipe main [
  1:integer <- copy 3:literal
  2:integer <- copy 14:literal
  3:integer <- copy 15:literal
  4:integer <- copy 16:literal
  5:integer <- length 1:array:integer
]
+run: instruction main/4
+mem: storing 3 in location 5

:(before "End Primitive Recipe Declarations")
LENGTH,
:(before "End Primitive Recipe Numbers")
Recipe_number["length"] = LENGTH;
:(before "End Primitive Recipe Implementations")
case LENGTH: {
  reagent x = canonize(current_instruction().ingredients.at(0));
  if (x.types.at(0) != Type_number["array"]) {
    raise << "tried to calculate length of non-array " << x.to_string() << '\n';
    break;
  }
  products.resize(1);
  assert(is_integer(Memory[x.value]));
  assert(!is_negative(Memory[x.value]));
  products.at(0).push_back(Memory[x.value]);  // length must be a positive integer
  break;
}