wor...@ariadne.com (Dale R. Worley) wrote: > Martin Bjorklund <m...@tail-f.com> writes: > >> > > > > It is worth noting (either here or in 6.1.3) how line-breaks inside > >> > > > > quoted strings are transcribed into the string's value. As now > >> > > > > written, it seems that the line-break is transcribed identically to > >> > > > > how it is represented in the source. That means (1) If the source > >> > > > > is > >> > > > > recoded with the other type of line break, the semantics of the > >> > > > > Yang > >> > > > > code change; and (2) if the source uses line-breaks of one type > >> > > > > (CRLF > >> > > > > or LF), only that type can be directly transcribed into string > >> > > > > values. > >> > > > > (But regardless of the source line-breaks, an LF can be transcribed > >> > > > > into a double-quoted string with "\n". But a CRLF cannot be > >> > > > > transcribed into a double-quoted string with escape sequences. Was > >> > > > > that intended, or was "\r" intended to be legal?) > >> > > > >> > > Don't forget this. > >> > >> I was wondering that (as the text is written) the value of a quoted > >> string that includes a line end will change if the line ends are > >> changed (say, by moving the Yang file to a different host). Normally > >> computer languages are defined so that changing how the program is > >> "represented", e.g., by transforming it into a form with different > >> line-ends, won't change the semantics of the program. > >> > >> But if it's true, I seems desirable to provide an explicit warning > >> about it. > > It still seems to me to be valuable to warn about this.
Do you have an suggestion for what to write? These kinds of multi-line strings are almost always 'description' statements, used for human consumption. It is not clear to me what the warning would be. > >> > You can always get the same effect by using single quoted strings. > >> > >> I don't see how you can get a single CR using single-quoted strings, > >> because line ends are only allowed to be LF and CR-LF; writing a CR > >> without an LF following it isn't allowed. Or is it that in practice, > >> Yang 1 allows people to use CR alone, and it is not interpreted as a > >> line-end? > > > > If the module has a string like this: > > > > 0x27 0x0d 0x27 > > > > it is a string with a single CR. > > I see in the grammar: > > line-break = CRLF / LF > > So you can't write an isolated CR in most of a Yang module. But am I > correct in understanding that you *can* write an isolated CR inside a > single-quoted string (and presumably, a double-quoted string)? Yes. /martin _______________________________________________ netmod mailing list netmod@ietf.org https://www.ietf.org/mailman/listinfo/netmod
