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module IRB
class << (MagicFile = Object.new)
# see parser_magic_comment in parse.y
ENCODING_SPEC_RE = %r"coding\s*[=:]\s*([[:alnum:]\-_]+)"
def open(path)
io = File.open(path, 'rb')
line = io.gets
line = io.gets if line[0,2] == "#!"
encoding = detect_encoding(line)
internal_encoding = encoding
encoding ||= default_src_encoding
io.rewind
io.set_encoding(encoding, internal_encoding)
if block_given?
begin
return (yield io)
ensure
io.close
end
else
return io
end
end
private
def detect_encoding(line)
return unless line[0] == ?#
line = line[1..-1]
line = $1 if line[/-\*-\s*(.*?)\s*-*-$/]
return nil unless ENCODING_SPEC_RE =~ line
encoding = $1
return encoding.sub(/-(?:mac|dos|unix)/i, '')
end
end
end