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Archiving hookablemacro

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This commit is contained in:
Eric Myllyoja 2022-03-14 22:02:44 -04:00
parent 60c6e5ee29
commit 7c0cb9c69c
2 changed files with 0 additions and 71 deletions
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1
source/funkin/modding/IHook.hx
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@ -13,5 +13,4 @@ import polymod.hscript.HScriptable;
// ALL of these values are added to ALL scripts in the child classes.
context: [FlxG, FlxSprite, Math, Paths, Std]
})
@:autoBuild(funkin.util.macro.HookableMacro.build())
interface IHook extends HScriptable {}

70
source/funkin/util/macro/HookableMacro.hx
View file

@ -1,70 +0,0 @@
package funkin.util.macro;
import haxe.macro.Context;
import haxe.macro.Expr;
using Lambda;
class HookableMacro
{
/**
* The @:hookable annotation replaces a given function with a variable that contains a function.
* It's still callable, like normal, but now you can also replace the value! Neat!
*
* NOTE: If you receive the following error when making a function use @:hookable:
* `Cannot access this or other member field in variable initialization`
* This is because you need to perform calls and assignments using a static variable referencing the target object.
*/
public static macro function build():Array<Field>
{
Context.info('Running HookableMacro...', Context.currentPos());
var cls:haxe.macro.Type.ClassType = Context.getLocalClass().get();
var fields:Array<Field> = Context.getBuildFields();
// Find all fields with @:hookable metadata
for (field in fields)
{
if (field.meta == null)
continue;
var scriptable_meta = field.meta.find(function(m) return m.name == ':hookable');
if (scriptable_meta != null)
{
Context.info(' @:hookable annotation found on field ${field.name}', Context.currentPos());
switch (field.kind)
{
case FFun(originalFunc):
// This is the type of the function, like (Int, Int) -> Int
var replFieldTypeRet:ComplexType = originalFunc.ret == null ? Context.toComplexType(Context.getType('Void')) : originalFunc.ret;
var replFieldType:ComplexType = TFunction([for (arg in originalFunc.args) arg.type], replFieldTypeRet);
// This is the expression of the function, i.e. the function body.
var replFieldExpr:ExprDef = EFunction(FAnonymous, {
ret: originalFunc.ret,
params: originalFunc.params,
args: originalFunc.args,
expr: originalFunc.expr
});
var replField:Field = {
name: field.name,
doc: field.doc,
access: field.access,
pos: field.pos,
meta: field.meta,
kind: FVar(replFieldType, {
expr: replFieldExpr,
pos: field.pos
}),
};
// Replace the original field with the new field
fields[fields.indexOf(field)] = replField;
default:
Context.error('@:hookable can only be used on functions', field.pos);
}
}
}
return fields;
}
}