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Contents
# frozen_string_literal: true
module GraphQL
# Helpers for migrating in a backwards-compatibile way
# @api private
module BackwardsCompatibility
module_function
# Given a callable whose API used to take `from` arguments,
# check its arity, and if needed, apply a wrapper so that
# it can be called with `to` arguments.
# If a wrapper is applied, warn the application with `name`.
#
# If `last`, then use the last arguments to call the function.
def wrap_arity(callable, from:, to:, name:, last: false)
arity = get_arity(callable)
case arity
when to
# It already matches, return it as is
callable
when from
# It has the old arity, so wrap it with an arity converter
message ="#{name} with #{from} arguments is deprecated, it now accepts #{to} arguments, see:"
backtrace = caller(0, 20)
# Find the first line in the trace that isn't library internals:
user_line = backtrace.find {|l| l !~ /lib\/graphql/ }
warn(message + "\n" + user_line + "\n")
wrapper = last ? LastArgumentsWrapper : FirstArgumentsWrapper
wrapper.new(callable, from)
else
raise "Can't wrap #{callable} (arity: #{arity}) to have arity #{to}"
end
end
def get_arity(callable)
case callable
when Method, Proc
callable.arity
else
callable.method(:call).arity
end
end
class FirstArgumentsWrapper
def initialize(callable, old_arity)
@callable = callable
@old_arity = old_arity
end
def call(*args)
backwards_compat_args = args.first(@old_arity)
@callable.call(*backwards_compat_args)
end
end
class LastArgumentsWrapper < FirstArgumentsWrapper
def call(*args)
backwards_compat_args = args.last(@old_arity)
@callable.call(*backwards_compat_args)
end
end
end
end
Version data entries
19 entries across 19 versions & 1 rubygems