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# encoding: utf-8
# frozen_string_literal: true
module Mail
module Encodings
class TransferEncoding
NAME = ''
PRIORITY = -1
def self.can_transport?(enc)
enc = Encodings.get_name(enc)
if Encodings.defined? enc
Encodings.get_encoding(enc).new.is_a? self
else
false
end
end
def self.can_encode?(enc)
can_transport? enc
end
def self.cost(str)
raise "Unimplemented"
end
def self.compatible_input?(str)
true
end
def self.to_s
self::NAME
end
def self.get_best_compatible(source_encoding, str)
if self.can_transport?(source_encoding) && self.compatible_input?(str)
source_encoding
else
choices = Encodings.get_all.select do |enc|
self.can_transport?(enc) && enc.can_encode?(source_encoding)
end
best = nil
best_cost = nil
choices.each do |enc|
# If the current choice cannot be transported safely,
# give priority to other choices but allow it to be used as a fallback.
this_cost = enc.cost(str) if enc.compatible_input?(str)
if !best_cost || (this_cost && this_cost < best_cost)
best_cost = this_cost
best = enc
elsif this_cost == best_cost
best = enc if enc::PRIORITY < best::PRIORITY
end
end
best
end
end
def to_s
self.class.to_s
end
end
end
end
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