Re: Single vs. Double Quotes

[John W. Eaton]

On 16-Oct-2011, Ben Abbott wrote:

| On Oct 15, 2011, at 5:07 PM, John W. Eaton wrote:
| 
| > On 15-Oct-2011, Michael Goffioul wrote:
| > 
| > | On Sat, Oct 15, 2011 at 7:08 PM, John W. Eaton <address@hidden> wrote:
| > | > On 15-Oct-2011, Michael Goffioul wrote:
| > | >
| > | > | way.This is could be achieved as easily as:
| > | > |
| > | > | strrep (delimiter_string, '\n', "\n")
| > | >
| > | > I'm not sure, but I don't think it is quite this simple.  WDMD if the
| > | > delimiter string is set to '\\n'?  Is this recognized as a
| > | > two-character sequence backslash and n, or is it backslash and NL?
| > | >
| > | > In *printf, I think it is backslash and n, so it would be unfortunate
| > | > if the delimiter string in strread did something different.
| > | 
| > | You're right, this was just a quick hack I considered, but far from a
| > | good solution. Your other solution is better. I also thought about
| > | that, but was afraid of other side-effects due to the use of sprintf.
| > | Doubling % characters should prevent them.
| > 
| > Another possibility is do_string_escapes.  It should still be applied
| > only to single-quoted strings in strread, but it saves you the step of
| > doubling the % characters and it only does backslash-style escape
| > processing, so it might be faster than sprintf.
| > 
| > jwe
| 
| 
| Is there a robust way to determine whether a string is single-quoted or 
double-quoted?

I checked in the following change to add the functions is_sq_string
and is_dq_string.

  http://hg.savannah.gnu.org/hgweb/octave/rev/f80473f24553

Any objection?  If anyone thinks it would be better to just check
the string that typeinfo returns, speak up and give some justification
for that and I'll consider removing these functions.

jwe