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//: make some recipes more friendly by trying to auto-convert their ingredients to text
:(scenarios transform)
:(scenario rewrite_stashes_to_text)
def main [
local-scope
n:num <- copy 34
stash n
]
+transform: {stash_2_0: ("address" "array" "character")} <- to-text-line {n: "number"}
+transform: stash {stash_2_0: ("address" "array" "character")}
:(scenario rewrite_traces_to_text)
def main [
local-scope
n:num <- copy 34
trace 2, [app], n
]
+transform: {trace_2_2: ("address" "array" "character")} <- to-text-line {n: "number"}
+transform: trace {2: "literal"}, {"app": "literal-string"}, {trace_2_2: ("address" "array" "character")}
//: special case: rewrite attempts to stash contents of most arrays to avoid
//: passing addresses around
:(scenario rewrite_stashes_of_arrays)
def main [
local-scope
n:&:@:num <- 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)
def main [
local-scope
n:@:num:3 <- create-array
stash n
]
+transform: stash {n: ("array" "number" "3")}
:(scenario rewrite_stashes_of_recipe_header_products)
container foo [
x:num
]
def bar -> x:foo [
local-scope
load-ingredients
x <- merge 34
stash x
]
+transform: stash {stash_2_0: ("address" "array" "character")}
//: misplaced; should be in instruction inserting/deleting transforms, but has
//: prerequisites: deduce_types_from_header and check_or_set_types_by_name
:(after "Transform.push_back(deduce_types_from_header)")
Transform.push_back(convert_ingredients_to_text); // idempotent
:(code)
void convert_ingredients_to_text(const recipe_ordinal r) {
recipe& caller = get(Recipe, r);
trace(9991, "transform") << "--- convert some ingredients to text in recipe " << caller.name << end();
// in recipes without named locations, 'stash' is still not extensible
if (contains_numeric_locations(caller)) return;
convert_ingredients_to_text(caller);
}
void convert_ingredients_to_text(recipe& caller) {
vector<instruction> new_instructions;
for (int i = 0; i < SIZE(caller.steps); ++i) {
instruction& inst = caller.steps.at(i);
// all these cases are getting hairy. how can we make this extensible?
if (inst.name == "stash") {
for (int j = 0; j < SIZE(inst.ingredients); ++j) {
if (is_literal_text(inst.ingredients.at(j))) continue;
ostringstream ingredient_name;
ingredient_name << "stash_" << i << '_' << j << ":address:array:character";
convert_ingredient_to_text(inst.ingredients.at(j), new_instructions, ingredient_name.str());
}
}
else if (inst.name == "trace") {
for (int j = /*skip*/2; j < SIZE(inst.ingredients); ++j) {
if (is_literal_text(inst.ingredients.at(j))) continue;
ostringstream ingredient_name;
ingredient_name << "trace_" << i << '_' << j << ":address:array:character";
convert_ingredient_to_text(inst.ingredients.at(j), new_instructions, ingredient_name.str());
}
}
else if (inst.name_before_rewrite == "append") {
// override only variants that try to append to a string
// Beware: this hack restricts how much 'append' can be overridden. Any
// new variants that match:
// append _:text, ___
// will never ever get used.
if (is_literal_text(inst.ingredients.at(0)) || is_mu_text(inst.ingredients.at(0))) {
for (int j = /*skip base*/1; j < SIZE(inst.ingredients); ++j) {
ostringstream ingredient_name;
ingredient_name << "append_" << i << '_' << j << ":address:array:character";
convert_ingredient_to_text(inst.ingredients.at(j), new_instructions, ingredient_name.str());
}
}
}
trace(9993, "transform") << to_string(inst) << end();
new_instructions.push_back(inst);
}
caller.steps.swap(new_instructions);
}
// add an instruction to convert reagent 'r' to text in list 'out', then
// replace r with converted text
void convert_ingredient_to_text(reagent& r, vector<instruction>& out, const string& tmp_var) {
if (!r.type) return; // error; will be handled elsewhere
if (is_mu_text(r)) return;
// don't try to extend static arrays
if (is_static_array(r)) return;
instruction def;
if (is_lookup_of_address_of_array(r)) {
def.name = "array-to-text-line";
reagent/*copy*/ tmp = r;
drop_one_lookup(tmp);
def.ingredients.push_back(tmp);
}
else {
def.name = "to-text-line";
def.ingredients.push_back(r);
}
def.products.push_back(reagent(tmp_var));
trace(9993, "transform") << to_string(def) << end();
out.push_back(def);
r.clear(); // reclaim old memory
r = reagent(tmp_var);
}
bool is_lookup_of_address_of_array(reagent/*copy*/ x) {
if (x.type->atom) return false;
if (x.type->left->name != "address") return false;
if (!canonize_type(x)) return false;
return is_mu_array(x);
}
bool is_static_array(const reagent& x) {
// no canonize_type()
return !x.type->atom && x.type->left->atom && x.type->left->name == "array";
}
//: Supporting 'append' above requires remembering what name an instruction
//: had before any rewrites or transforms.
:(before "End instruction Fields")
string name_before_rewrite;
:(before "End instruction Clear")
name_before_rewrite.clear();
:(before "End next_instruction(curr)")
curr->name_before_rewrite = curr->name;
:(scenarios run)
:(scenario append_other_types_to_text)
def main [
local-scope
n:num <- copy 11
c:character <- copy 111/o
a:text <- append [abc], 10, n, c
expected:text <- new [abc1011o]
10:bool/raw <- equal a, expected
]
//: Make sure that the new system is strictly better than just the 'stash'
//: primitive by itself.
:(scenario rewrite_stash_continues_to_fall_back_to_default_implementation)
# type without a to-text implementation
container foo [
x:num
y:num
]
def main [
local-scope
x:foo <- merge 34, 35
stash x
]
+app: 34 35
|