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module Teacup
module_function
# Merges two Hashes. This is similar to `Hash#merge`, except the values will
# be merged recursively (aka deep merge) when both values for a key are
# Hashes, and values for the *left* argument are preferred over values on the
# right.
#
# If you pass in a third argument, it will be acted upon directly instead of
# creating a new Hash. Usually used with `merge_defaults!`, which merges values
# from `right` into `left`.
def merge_defaults(left, right, target={})
if target != left
left.each do |key, value|
if target.has_key? key and value.is_a?(Hash) and target[key].is_a?(Hash)
target[key] = Teacup::merge_defaults(target[key], value)
else
if value.is_a?(Hash)
# make a copy of the Hash
value = Teacup::merge_defaults!({}, value)
end
target[key] = value
end
end
end
right.each do |key, value|
if not target.has_key? key
target[key] = value
elsif value.is_a?(Hash) and left[key].is_a?(Hash)
target[key] = Teacup::merge_defaults(left[key], value, (left==target ? left[key] : {}))
end
end
target
end
# modifies left by passing it in as the `target`.
def merge_defaults!(left, right)
Teacup::merge_defaults(left, right, left)
end
end
Version data entries
31 entries across 31 versions & 1 rubygems