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omg so much scary stuff

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Adam D. Ruppe 2020-01-01 11:51:20 -05:00
parent 3316e500a5
commit 046d55e880
3 changed files with 73 additions and 25 deletions
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33
declarativeloader.d
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@ -5,26 +5,27 @@ module arsd.declarativeloader;
import std.range;
// @VariableLength indicates the value is saved in a MIDI like format
// @BigEndian, @LittleEndian
// @NumBytes!Field or @NumElements!Field controls length of embedded arrays
// @Tagged!Field indicates a tagged union. Each struct within should have @Tag(X) which is a value of Field
// @MustBe() causes it to throw if not the given value
// @NotSaved indicates a struct member that is not actually saved in the file
///
enum BigEndian;
///
enum LittleEndian;
/// @VariableLength indicates the value is saved in a MIDI like format
enum VariableLength;
/// @NumBytes!Field or @NumElements!Field controls length of embedded arrays
struct NumBytes(alias field) {}
/// ditto
struct NumElements(alias field) {}
/// @Tagged!Field indicates a tagged union. Each struct within should have @Tag(X) which is a value of Field
struct Tagged(alias field) {}
struct TagStruct(T) { T t; }
/// ditto
auto Tag(T)(T t) {
return TagStruct!T(t);
}
enum NotSaved;
struct TagStruct(T) { T t; }
struct MustBeStruct(T) { T t; }
/// The marked field is not in the actual file
enum NotSaved;
/// Insists the field must be a certain value, like for magic numbers
auto MustBe(T)(T t) {
return MustBeStruct!T(t);
}
@ -65,7 +66,7 @@ union N(ty) {
ubyte[ty.sizeof] bytes;
}
// input range of ubytes...
/// input range of ubytes...
int loadFrom(T, Range)(ref T t, auto ref Range r, bool assumeBigEndian = false) {
int bytesConsumed;
ubyte next() {
@ -160,9 +161,19 @@ int loadFrom(T, Range)(ref T t, auto ref Range r, bool assumeBigEndian = false)
}
} else {
while(numElementsRemaining) {
//import std.stdio; writeln(memberName);
E piece;
auto by = loadFrom(piece, r, endianness);
numElementsRemaining--;
// such a filthy hack, needed for Java's mistake though :(
static if(__traits(compiles, piece.takesTwoSlots())) {
if(piece.takesTwoSlots()) {
__traits(getMember, t, memberName) ~= piece;
numElementsRemaining--;
}
}
bytesConsumed += by;
__traits(getMember, t, memberName) ~= piece;
}