mirror of
https://github.com/JHDev2006/Super-Mario-Bros.-Remastered-Public.git
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84 lines
2.9 KiB
GDScript
84 lines
2.9 KiB
GDScript
class_name ModLoaderHookChain
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extends RefCounted
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## Small class to keep the state of hook execution chains and move between mod hook calls.[br]
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## For examples, see [method ModLoaderMod.add_hook].
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## The reference object is usually the [Node] that the vanilla script is attached to. [br]
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## If the hooked method is [code]static[/code], it will contain the [GDScript] itself.
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var reference_object: Object
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var _callbacks: Array[Callable] = []
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var _callback_index := -1
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const LOG_NAME := "ModLoaderHookChain"
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# `callbacks` is kept as untyped Array for simplicity when creating a new chain.
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# This approach allows direct use of `[vanilla_method] + hooks` without the need to cast types with Array.assign().
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func _init(reference_object: Object, callbacks: Array) -> void:
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self.reference_object = reference_object
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_callbacks.assign(callbacks)
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_callback_index = callbacks.size()
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## Will execute the next mod hook callable or vanilla method and return the result.[br]
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## [br]
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## [br][b]Parameters:[/b][br]
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## - [param args] ([Array]): An array of all arguments passed into the vanilla function. [br]
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## [br]
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## [br][b]Returns:[/b][br]
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## - [Variant]: Return value of the next function in the chain.[br]
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## [br]
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## Make sure to call this method [i][color=orange]once[/color][/i] somewhere in the [param mod_callable] you pass to [method ModLoaderMod.add_hook]. [br]
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func execute_next(args := []) -> Variant:
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var callback := _get_next_callback()
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if not callback:
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return
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# Vanilla needs to be called without the hook chain being passed
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if _is_callback_vanilla():
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return callback.callv(args)
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return callback.callv([self] + args)
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## Same as [method execute_next], but asynchronous - it can be used if a method uses [code]await[/code]. [br]
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## [br]
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## [br][b]Parameters:[/b][br]
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## - [param args] ([Array]): An array of all arguments passed into the vanilla function. [br]
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## [br]
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## [br][b]Returns:[/b][br]
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## - [Variant]: Return value of the next function in the chain.[br]
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## [br]
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## This hook needs to be used if the vanilla method uses [code]await[/code] somewhere. [br]
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## Make sure to call this method [i][color=orange]once[/color][/i] somewhere in the [param mod_callable] you pass to [method ModLoaderMod.add_hook]. [br]
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func execute_next_async(args := []) -> Variant:
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var callback := _get_next_callback()
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if not callback:
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return
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# Vanilla needs to be called without the hook chain being passed
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if _is_callback_vanilla():
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return await callback.callv(args)
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return await callback.callv([self] + args)
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func _get_next_callback() -> Variant:
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_callback_index -= 1
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if not _callback_index >= 0:
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ModLoaderLog.fatal(
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"The hook chain index should never be negative. " +
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"A mod hook has called execute_next twice or ModLoaderHookChain was modified in an unsupported way.",
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LOG_NAME
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)
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return
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return _callbacks[_callback_index]
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func _is_callback_vanilla() -> bool:
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return _callback_index == 0
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