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|
# frozen_string_literal: true
module Sinatra
# A poor man's ActiveSupport::HashWithIndifferentAccess, with all the Rails-y
# stuff removed.
#
# Implements a hash where keys <tt>:foo</tt> and <tt>"foo"</tt> are
# considered to be the same.
#
# rgb = Sinatra::IndifferentHash.new
#
# rgb[:black] = '#000000' # symbol assignment
# rgb[:black] # => '#000000' # symbol retrieval
# rgb['black'] # => '#000000' # string retrieval
#
# rgb['white'] = '#FFFFFF' # string assignment
# rgb[:white] # => '#FFFFFF' # symbol retrieval
# rgb['white'] # => '#FFFFFF' # string retrieval
#
# Internally, symbols are mapped to strings when used as keys in the entire
# writing interface (calling e.g. <tt>[]=</tt>, <tt>merge</tt>). This mapping
# belongs to the public interface. For example, given:
#
# hash = Sinatra::IndifferentHash.new
# hash[:a] = 1
#
# You are guaranteed that the key is returned as a string:
#
# hash.keys # => ["a"]
#
# Technically other types of keys are accepted:
#
# hash = Sinatra::IndifferentHash
# hash[:a] = 1
# hash[0] = 0
# hash # => { "a"=>1, 0=>0 }
#
# But this class is intended for use cases where strings or symbols are the
# expected keys and it is convenient to understand both as the same. For
# example the +params+ hash in Sinatra.
class IndifferentHash < Hash
def self.[](*args)
new.merge!(Hash[*args])
end
def default(*args)
args.map!(&method(:convert_key))
super(*args)
end
def default=(value)
super(convert_value(value))
end
def assoc(key)
super(convert_key(key))
end
def rassoc(value)
super(convert_value(value))
end
def fetch(key, *args)
args.map!(&method(:convert_value))
super(convert_key(key), *args)
end
def [](key)
super(convert_key(key))
end
def []=(key, value)
super(convert_key(key), convert_value(value))
end
alias store []=
def key(value)
super(convert_value(value))
end
def key?(key)
super(convert_key(key))
end
alias has_key? key?
alias include? key?
alias member? key?
def value?(value)
super(convert_value(value))
end
alias has_value? value?
def delete(key)
super(convert_key(key))
end
# Added in Ruby 2.3
def dig(key, *other_keys)
super(convert_key(key), *other_keys)
end
def fetch_values(*keys)
keys.map!(&method(:convert_key))
super(*keys)
end
def slice(*keys)
keys.map!(&method(:convert_key))
self.class[super(*keys)]
end
def values_at(*keys)
keys.map!(&method(:convert_key))
super(*keys)
end
def merge!(*other_hashes)
other_hashes.each do |other_hash|
if other_hash.is_a?(self.class)
super(other_hash)
else
other_hash.each_pair do |key, value|
key = convert_key(key)
value = yield(key, self[key], value) if block_given? && key?(key)
self[key] = convert_value(value)
end
end
end
self
end
alias update merge!
def merge(*other_hashes, &block)
dup.merge!(*other_hashes, &block)
end
def replace(other_hash)
super(other_hash.is_a?(self.class) ? other_hash : self.class[other_hash])
end
def transform_values(&block)
dup.transform_values!(&block)
end
def transform_values!
super
super(&method(:convert_value))
end
def transform_keys(&block)
dup.transform_keys!(&block)
end
def transform_keys!
super
super(&method(:convert_key))
end
def select(*args, &block)
return to_enum(:select) unless block_given?
dup.tap { |hash| hash.select!(*args, &block) }
end
def reject(*args, &block)
return to_enum(:reject) unless block_given?
dup.tap { |hash| hash.reject!(*args, &block) }
end
def compact
dup.tap(&:compact!)
end
def except(*keys)
keys.map!(&method(:convert_key))
self.class[super(*keys)]
end if Gem::Version.new(RUBY_VERSION) >= Gem::Version.new("3.0")
private
def convert_key(key)
key.is_a?(Symbol) ? key.to_s : key
end
def convert_value(value)
case value
when Hash
value.is_a?(self.class) ? value : self.class[value]
when Array
value.map(&method(:convert_value))
else
value
end
end
end
end
|
