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//: when encountering other types, try to convert them to strings using
//: 'to-text'
:(scenarios transform)
:(scenario rewrite_stashes_to_text)
recipe main [
local-scope
n:number <- copy 34
stash n
]
+transform: {stash_2_0: ("address" "array" "character")} <- to-text-line {n: "number"}
+transform: stash {stash_2_0: ("address" "array" "character")}
//: special case: rewrite attempts to stash contents of most arrays to avoid
//: passing addresses around
:(scenario rewrite_stashes_of_arrays)
recipe main [
local-scope
n:address:array:number <- new number:type, 3
stash *n
]
+transform: {stash_2_0: ("address" "array" "character")} <- array-to-text-line {n: ("address" "array" "number")}
+transform: stash {stash_2_0: ("address" "array" "character")}
:(scenario ignore_stashes_of_static_arrays)
recipe main [
local-scope
n:array:number:3 <- create-array
stash n
]
+transform: stash {n: ("array" "number" "3")}
:(before "End Instruction Inserting/Deleting Transforms")
Transform.push_back(rewrite_stashes_to_text);
:(code)
void rewrite_stashes_to_text(recipe_ordinal r) {
recipe& caller = get(Recipe, r);
trace(9991, "transform") << "--- rewrite 'stash' instructions in recipe " << caller.name << end();
// in recipes without named locations, 'stash' is still not extensible
if (contains_numeric_locations(caller)) return;
check_or_set_types_by_name(r); // prerequisite
rewrite_stashes_to_text(caller);
}
void rewrite_stashes_to_text(recipe& caller) {
vector<instruction> new_instructions;
for (int i = 0; i < SIZE(caller.steps); ++i) {
instruction& inst = caller.steps.at(i);
if (inst.name == "stash") {
for (int j = 0; j < SIZE(inst.ingredients); ++j) {
if (!inst.ingredients.at(j).type) {
// error; will be handled elsewhere
continue;
}
if (is_literal(inst.ingredients.at(j))) continue;
if (is_mu_string(inst.ingredients.at(j))) continue;
// don't try to extend static arrays
if (is_static_array(inst.ingredients.at(j))) continue;
instruction def;
if (is_lookup_of_address_of_array(inst.ingredients.at(j))) {
def.name = "array-to-text-line";
reagent/*copy*/ tmp = inst.ingredients.at(j);
drop_one_lookup(tmp);
def.ingredients.push_back(tmp);
}
else {
def.name = "to-text-line";
def.ingredients.push_back(inst.ingredients.at(j));
}
ostringstream ingredient_name;
ingredient_name << "stash_" << i << '_' << j << ":address:array:character";
def.products.push_back(reagent(ingredient_name.str()));
trace(9993, "transform") << to_string(def) << end();
new_instructions.push_back(def);
inst.ingredients.at(j).clear(); // reclaim old memory
inst.ingredients.at(j) = reagent(ingredient_name.str());
}
}
trace(9993, "transform") << to_string(inst) << end();
new_instructions.push_back(inst);
}
caller.steps.swap(new_instructions);
}
bool is_lookup_of_address_of_array(reagent/*copy*/ x) {
if (x.type->name != "address") return false;
if (!canonize_type(x)) return false;
return x.type->name == "array";
}
bool is_static_array(const reagent& x) {
// no canonize_type()
return x.type->name == "array";
}
//: Make sure that the new system is strictly better than just the 'stash'
//: primitive by itself.
:(scenarios run)
:(scenario rewrite_stash_continues_to_fall_back_to_default_implementation)
# type without a to-text implementation
container foo [
x:number
y:number
]
recipe main [
local-scope
x:foo <- merge 34, 35
stash x
]
+app: 34 35
:(before "End Primitive Recipe Declarations")
TO_TEXT,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "to-text", TO_TEXT);
:(before "End Primitive Recipe Checks")
case TO_TEXT: {
if (SIZE(inst.ingredients) != 1) {
raise << maybe(get(Recipe, r).name) << "'to-text' requires a single ingredient, but got '" << to_original_string(inst) << "'\n" << end();
break;
}
// can handle any type
break;
}
:(before "End Primitive Recipe Implementations")
case TO_TEXT: {
products.resize(1);
products.at(0).push_back(new_mu_string(print_mu(current_instruction().ingredients.at(0), ingredients.at(0))));
break;
}
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