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unless String.method_defined? :byteslice
require 'backports/tools/arguments'
class String
def byteslice(start, len = Backports::Undefined)
# Argument parsing & checking
if Backports::Undefined == len
if start.is_a?(Range)
range = start
start = Backports.coerce_to_int(range.begin)
start += bytesize if start < 0
last = Backports.coerce_to_int(range.end)
last += bytesize if last < 0
last += 1 unless range.exclude_end?
len = last - start
else
start = Backports.coerce_to_int(start)
start += bytesize if start < 0
len = 1
return if start >= bytesize
end
else
start = Backports.coerce_to_int(start)
start += bytesize if start < 0
len = Backports.coerce_to_int(len)
return if len < 0
end
return if start < 0 || start > bytesize
len = 0 if len < 0
# Actual implementation:
str = unpack("@#{start}a#{len}").first
str = dup.replace(str) unless self.instance_of?(String) # Must return subclass
str.force_encoding(encoding) if respond_to?(:encoding)
str
end
end
end
|
