Re: [Gnuplot-info] Enhanced-escape bug (at least 8 years old)...

[Craig D. <def...@bo...>]

Ah.  Sorry, I completely misunderstood the nature of the double-quotes in question -- I assumed they were in some shell command.  In the past (and earlier versions of gnuplot) I've had trouble on occasion using single quotes and just emitted double-quotes for everything. 

Thanks for the clarification.

Cheers,
Craig



On Jan 20, 2014, at 6:33 PM, Ethan A Merritt <EAM...@gm...> wrote:

> On Monday, 20 January 2014 05:41:04 PM Craig DeForest wrote:
>> In enhanced-mode, escaped characters such as ampersand require not one escape but two.  
>> For example, the string 'S\&P 500' renders as "S P 500" in a title.  
> 
> I think you will find that is not quite true. 
> The single-quoted string you show will print as S&P 500.
> It would act as you show if the string were in double-quotes.
> 
>> The string 'S\\&P 500' renders correctly.  This is reproducible with pdf, eps, and all the cairo terminals.
> 
> Again true for double-quotes but not for single-quotes.
> 
> 
>> I googled for the problem, and found this thread 
>> ("http://comp.graphics.apps.gnuplot.narkive.com/GtFk5Tfg/ampersand-in-title")
>> from 8 years ago, complete with in-character comments from both Juergen and Ethan.
>> As far as I can tell, the behavior has been neither documented nor repaired in that time.  
> 
> It is documented under "help enhanced" and "help quotes".
> Those bits may have been added in response to that query 8 years ago.
> I don't recall.
> 
>> Or is it now established behavior that instead needs to be documented?
> 
> It is an integral part of the enhanced text processing.
> The same is true for all the special characters:   & _ ^ @ ~
> 
> The suggestions in that thread from 8 years ago are still valid.
> You have the options:
> 
> - Turn off enhanced mode
> or
> - Use single quotes and a single backslash to escape each special character
> or
> - Use double quotes and two backslashes to escape each special character
> or
> - (kind of obscure but nonetheless "correct" if you are in a UTF-8 locale) 
>  use the character at unicode FF06   ＆
>  instead of the one at unicode 0026  &
> 
>> Is this something about which a patch would be welcome? 
> 
> A patch to do what, exactly?
> Maybe each of the enhanced text markup characters should 
> have its own help index entry?
> 
> 	Ethan
> 	
> 
>> Cheers,
>> Craig
>> 
>> 
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