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# frozen_string_literal: true
require "ffi-gobject/closure"
module GObject
# Encapsulates Ruby blocks as GObject Closures.
class RubyClosure < Closure
# @api private
BLOCK_STORE = {}
# Extend the standard +GObject::Closure+ layout with a field block_id to store
# the object_id of the associated block.
#
# @api private
class Struct < GirFFI::Struct
layout :parent, Closure::Struct, 0,
:block_id, :int64
end
def initialize(&block)
block or raise ArgumentError, "Block needed"
initialize_simple(self.class::Struct.size, nil)
self.block = block
set_marshal proc { |*args| self.class.marshaller(*args) }
end
# @api private
def self.marshaller(closure, return_value, param_values, _invocation_hint,
_marshal_data)
# TODO: Improve by registering RubyClosure as a GObject type
rclosure = wrap(closure.to_ptr)
param_values ||= []
args = param_values.map(&:get_value)
result = rclosure.invoke_block(*args)
return_value&.set_value(result)
end
# @api private
# TODO: Re-structure so invoke_block can become a private method
def invoke_block(*args)
block.call(*args)
end
private
# @api private
def block=(block)
id = block.object_id
BLOCK_STORE[id] = block
struct[:block_id] = id
end
def block
BLOCK_STORE[struct[:block_id]]
end
end
end
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