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module FFI
class VariadicInvoker
def VariadicInvoker.new(library, function, arg_types, ret_type, options)
invoker = self.__new(library, function, ret_type, options[:convention].to_s)
invoker.init(arg_types, options[:type_map])
invoker
end
def init(arg_types, type_map)
@fixed = Array.new
@type_map = type_map
arg_types.each_with_index do |type, i|
@fixed << FFI.find_type(type, @type_map) unless type == FFI::NativeType::VARARGS
end
end
def call(*args, &block)
param_types = Array.new(@fixed)
param_values = Array.new
@fixed.each_with_index do |t, i|
param_values << args[i]
end
i = @fixed.length
while i < args.length
param_types << FFI.find_type(args[i], @type_map)
param_values << args[i + 1]
i += 2
end
invoke(param_types, param_values, &block)
end
def attach(mod, mname)
#
# Attach the invoker to this module as 'mname'.
#
invoker = self
params = "*args"
call = "call"
mod.module_eval <<-code
@@#{mname} = invoker
def self.#{mname}(#{params})
@@#{mname}.#{call}(#{params})
end
def #{mname}(#{params})
@@#{mname}.#{call}(#{params})
end
code
invoker
end
end
end
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