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Contents
module Gorillib
module Hashlike
module TreeMerge
# Recursively merges hashlike objects
#
# For each key in keys,
# * if block_given? and yield(key,self_val,other_val) returns non-nil, set that
# * if self is missing value for key, receive the attribute.
# * if self's attribute is an Array, append to it.
# * if self's value responds to tree_merge!, deep merge it.
# * if self's value responds_to merge!, merge! it.
# * otherwise, receive the value from other_hash
#
def tree_merge!(other_hash)
return self if other_hash.blank?
[self.keys, other_hash.keys].flatten.uniq.each do |key|
# get other's val if any
if other_hash.has_key?(key.to_sym) then other_val = other_hash[key.to_sym]
elsif other_hash.has_key?(key.to_s) then other_val = other_hash[key.to_s]
else next ; end
# get self val if any
self_val = self[key]
# get block resolved result if any
if block_given? && yield(key, self_val, other_val)
next
end
# p ['hash tree_merge', key, self_val.respond_to?(:tree_merge!), self_val, '***************', other_val]
#
case
when other_val.nil? then next
when (not has_key?(key)) then self[key] = other_val
when self_val.is_a?(Array) then self[key] += other_val
when self_val.respond_to?(:tree_merge!) then self[key] = self_val.tree_merge!(other_val)
when self_val.respond_to?(:merge!) then self[key] = self_val.merge!(other_val)
else self[key] = other_val
end
end
self
end
end
end
end
class Hash
include Gorillib::Hashlike::TreeMerge
end
Version data entries
7 entries across 7 versions & 1 rubygems