encodings/newline_conversions_parens.rb

tests/_examples/encodings/newline_conversions_parens.rb in the metorex repository.

# `encode` rewrites line endings when asked. `universal_newline:` reads CR LF
# and a lone CR as LF, and `crlf_newline:` and `cr_newline:` write each LF as
# CR LF or as CR. `newline:` names the same conversions, `:lf` among them,
# and is read ahead of the flags.
text = "a\r\nb\rc\nd"
p(text.encode(universal_newline: true))
p(text.encode(crlf_newline: true))
p(text.encode(cr_newline: true))
p(text.encode(cr_newline: false))
p(text.encode(newline: :lf))
p(text.encode(newline: :crlf, universal_newline: true))
p(text.encode("UTF-16LE", universal_newline: true).encode("UTF-8"))

# More than one flag names no converter, and `newline:` takes only the names
# it knows.
def refusal()
  yield()
rescue StandardError => problem
  [problem.class(), problem.message()]
end

p(refusal() { text.encode(universal_newline: true, crlf_newline: true) })
p(refusal() { text.encode(crlf_newline: true, cr_newline: true) })
p(refusal() { text.encode(newline: :other) })
p(refusal() { text.encode(newline: "crlf") })

Output:

"a\nb\nc\nd"
"a\r\r\nb\rc\r\nd"
"a\r\rb\rc\rd"
"a\r\nb\rc\nd"
"a\nb\nc\nd"
"a\r\r\nb\rc\r\nd"
"a\nb\nc\nd"
[Encoding::ConverterNotFoundError, "code converter not found (universal_newline,crlf_newline)"]
[Encoding::ConverterNotFoundError, "code converter not found (crlf_newline,cr_newline)"]
[ArgumentError, "unexpected value for newline option: other"]
[ArgumentError, "unexpected value for newline option"]