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Contents
class RakeCommander
module Patcher
# Helpers to patch
module Helpers
# For a given method `meth` it gives the index of the parameter `arg_name`
# @return [Integer, NilClass] the position of `arg_name` in parameters.
def method_argument_idx(meth, arg_name)
arg_name = arg_name.to_sym
meth.parameters.each_with_index do |(_type, name), i|
return i if name == arg_name
end
end
# Its usage only makes sense if you extended an existing method you are patching.
# Therefore it is expected that `super` exists, so the original parameters definition
# of the method can be accessed.
# @note although the signature of a method can change through different versions
# the name of the parameters is generally preserved (specially when they are core parameters).
# @example
# module Rake
# class Application
# def init(*args)
# args = RakeCommander::Patcher.change_method_argument(:argv, method: method(__method__), args: args) do |value|
# RakeCommander.argv_rake_native_arguments(value)
# end
# super(*args)
# end
# end
# end
#
# @param arg_name [Symbol, String] the name of the parameter as it reads in the original method.
# @param method [Method] the extended method (not its `super` method)
# @return [Array] the original arguments where `arg_name` has been changed.
def change_method_argument(arg_name, method:, args:)
raise ArgumentError, 'Expecting block' unless block_given?
raise ArgumentError, "Expecting Method. Given #{method.class}" unless method.is_a?(Method)
if idx = method_argument_idx(method.super_method, arg_name.to_sym)
args[idx] = yield(args[idx])
end
args
end
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems