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//: Phase 2: Filter loaded recipes through an extensible list of 'transforms'.
//:
//: The process of running Mu code:
//: load -> transform -> run
//:
//: The hope is that this framework of transform tools will provide a
//: deconstructed alternative to conventional compilers.
//:
//: We're going to have many transforms in Mu, and getting their order right
//: (not the same as ordering of layers) is a well-known problem. Some tips:
//: a) Design each layer to rely on as few previous layers as possible.
//:
//: b) When positioning transforms, try to find the tightest constraint in
//: each transform relative to previous layers.
//:
//: c) Even so you'll periodically need to try adjusting each transform
//: relative to those in previous layers to find a better arrangement.
:(before "End recipe Fields")
int transformed_until;
:(before "End recipe Constructor")
transformed_until = -1;
:(before "End Types")
typedef void (*transform_fn)(const recipe_ordinal);
:(before "End Globals")
vector<transform_fn> Transform;
:(before "End One-time Setup")
initialize_transforms();
:(code)
void initialize_transforms() {
// Begin Transforms
// Begin Instruction Inserting/Deleting Transforms
// End Instruction Inserting/Deleting Transforms
// Begin Instruction Modifying Transforms
// End Instruction Modifying Transforms
// End Transforms
// Begin Checks
// End Checks
}
void transform_all() {
trace(100, "transform") << "=== transform_all()" << end();
// Begin transform_all
for (int t = 0; t < SIZE(Transform); ++t) {
for (map<recipe_ordinal, recipe>::iterator p = Recipe.begin(); p != Recipe.end(); ++p) {
recipe& r = p->second;
if (r.transformed_until != t-1) continue;
// End Transform Checks
(*Transform.at(t))(/*recipe_ordinal*/p->first);
r.transformed_until = t;
}
}
parse_int_reagents(); // do this after all other transforms have run
// End transform_all
}
//: Even though a run will involve many calls to transform_all() for tests,
//: our logical model is to load all code, then transform all code, then run.
//: If you load new code that should cause already-transformed recipes to
//: change, that's not supported. To help detect such situations and raise
//: helpful errors we track a count of the number of calls made to
//: transform_all().
:(before "End Globals")
int Num_calls_to_transform_all = 0;
:(after "void transform_all()")
++Num_calls_to_transform_all;
:(code)
void parse_int_reagents() {
trace(101, "transform") << "--- parsing any uninitialized reagents as integers" << end();
for (map<recipe_ordinal, recipe>::iterator p = Recipe.begin(); p != Recipe.end(); ++p) {
recipe& r = p->second;
if (r.steps.empty()) continue;
for (int index = 0; index < SIZE(r.steps); ++index) {
instruction& inst = r.steps.at(index);
for (int i = 0; i < SIZE(inst.ingredients); ++i) {
populate_value(inst.ingredients.at(i));
}
for (int i = 0; i < SIZE(inst.products); ++i) {
populate_value(inst.products.at(i));
}
}
}
}
void populate_value(reagent& r) {
if (r.initialized) return;
// End Reagent-parsing Exceptions
if (!is_integer(r.name)) return;
r.set_value(to_integer(r.name));
}
// helper for tests -- temporarily suppress run
void transform(string form) {
load(form);
transform_all();
}
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