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Contents
module Scalyr; module Common; module Util;
# Flattens a hash or array, returning a hash where keys are a delimiter-separated string concatenation of all
# nested keys. Returned keys are always strings. If a non-hash or array is provided, raises TypeError.
# Please see rspec util_spec.rb for expected behavior.
def self.flatten(obj, delimiter='_')
# base case is input object is not enumerable, in which case simply return it
if !obj.respond_to?(:each)
raise TypeError.new('Input must be a hash or array')
end
result = Hash.new
# require 'pry'
# binding.pry
if obj.respond_to?(:has_key?)
# input object is a hash
obj.each do |key, value|
if value.respond_to?(:each)
flatten(value).each do |subkey, subvalue|
result["#{key}#{delimiter}#{subkey}"] = subvalue
end
else
result["#{key}"] = value
end
end
else
# input object is an array or set
obj.each_with_index do |value, index|
if value.respond_to?(:each)
flatten(value).each do |subkey, subvalue|
result["#{index}#{delimiter}#{subkey}"] = subvalue
end
else
result["#{index}"] = value
end
end
end
return result
end
end; end; end;
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10 entries across 10 versions & 1 rubygems