Resolving unicode escapes to unicode character

[Tyler]

Hi all,
I'm trying to parse escaped unicode characters. The basic goal is to
read the string '\u00F3' (or "\\u00F3") as 'ó'. I have a workaround
below that uses eval (code below), but I'd be grateful if anyone had a
less dangerous solution or suggestion. In python, you can 'import
codecs' and use string.decode("unicode-escape"), is something similar
possible in Ruby?

Thanks!
Tyler


File.open("test.txt", 'w') {|file| file.puts "Asociaci\\u00F3n Alumni
\nF\\u00FAtbol"}
File.open "test.txt", 'r' do |file|
file.each do |line|
puts eval("%Q{#{line}}")
# puts line
end
end
# => Asociación Alumni
# => Fútbol
#
# If 'puts line' is used instead, this is the output:
# => Asociaci\u00F3n Alumni
# => F\u00FAtbol
#
# Is there a (prettier & safer) way to do this without using eval?

 

[Robert Klemme]

Hi all,
I'm trying to parse escaped unicode characters. The basic goal is to
read the string '\u00F3' (or "\\u00F3") as 'ó'. I have a workaround
below that uses eval (code below), but I'd be grateful if anyone had a
less dangerous solution or suggestion. In python, you can 'import
codecs' and use string.decode("unicode-escape"), is something similar
possible in Ruby?

irb(main):037:0> s="a\\u00fab"
=> "a\\u00fab"
irb(main):038:0> puts s
a\u00fab
=> nil
irb(main):039:0> s.gsub(%r[\\u(\h{4})]) {$1.to_i(16).chr(Encoding::UTF_8)}
=> "aúb"

Kind regards

robert