[R] MenuRead() Question

[Prof Brian Ripley]

On Sun, 26 Mar 2006, Keith Chamberlain wrote:

> Dear Gabor & Philipe,
>
> Thank you for clarifying regular expressions, and how tk menus are
> demarcated in menus.txt. Regular expressions are beginning to make sense for
> me, and the menu is now being added properly to the tk window.
>
> regexpr("^[$]Tk[.].+/", menu)...
> If I understand better, the expression is matching "$Tk." but since "$" and
> "." have special meanings in regular expressions, they need to be in
> brackets so that they are interpreted literally.

Or, better, escaped by \ (entered as \\ in an R character string).
Please do read ?regexp for how to use regular expressions in R.


>
> Rgds,
> KeithC.
>
> -----Original Message-----
> From: Philippe Grosjean [mailto:phgrosjean at sciviews.org]
> Sent: Sunday, March 26, 2006 9:49 AM
> To: Keith Chamberlain
> Cc: r-help at stat.math.ethz.ch
> Subject: Re: [R] MenuRead() Question
>
> Hi Keith,
>
> If you want to define a Tk menu using MenuRead() and a text file to
> define your menu, you have to start it with "Tk.". That way, MenuRead()
> recognizes that it is a Tk menu. So, rewrite your menu definition file as:
>
> > <menu.txt - in RHOME>
> > $Tk.KSesnMain
> > |$MenuTest
> > ||Objects        ~~ ls()
> > ||-
> > ||Path	   ~~ search()
>
> Note also that KSesnMain must point to a valid Tk window previously
> constructed.
> Best,
>
> Philippe Grosjean
>
>
> Keith Chamberlain wrote:
>> Dear List-mates,
>>
>> I think the difficulty I'm having is localized to the MenuType() call made
>> from within MenuRead(). I'm not used to seeing text operations such as "^"
>> or "[]", so am having trouble understanding what's going on.
>>
>> I'm interested in understanding the regular expression:
>> regexpr("^[$]Tk[.].+/", menu), and why it my menus.txt file is not
> returning
>> at that point.
>>
>> ?regex explains that the "^" symbol excludes the text enclosed in brackets
>> what is in the character string in following brackets, so a bunch of
>> matching on string vectors going on that I don't understand well enough
> yet.
>> Do I need to install PCRE-6.6 for this to start working?
>>
>> Rgds,
>> KeithC.
>>
>>
>>
>> -----Original Message-----
>> From: Keith Chamberlain [mailto:chamberk at colorado.edu]
>> Sent: Saturday, March 25, 2006 4:26 PM
>> To: 'r-help at stat.math.ethz.ch'
>> Cc: 'Philippe Grosjean'
>> Subject: MenuRead() Question
>>
>> Dear List-mates,
>>
>> I'm trying to read a tk window menu from a file using {svWidgets} and
>> 'menus.txt' but am receiving Warnings without seeing the desired
>> consequences of the call.
>>
>> library(svWidgets)
>> tkWinAdd("KSesnMain",title="kLab Session Manager for R", pos="+0+0")
>> MenuRead(file="menus.txt")
>>
>> Warning messages:
>> 1: Unrecognized menu type for $KSesnMain/MenuTest in: MenuType(menu)
>> 2: Unrecognized menu type for $KSesnMain/MenuTest in: MenuType(menu)
>> 3: Unrecognized menu type for $KSesnMain/MenuTest in: MenuType(menu)
>> 4: Unrecognized menu type for $KSesnMain/MenuTest in: MenuType(menu)
>>
>> <menu.txt - in RHOME>
>> $KSesnMain
>> |$MenuTest
>> ||Objects  ~~ ls()
>> ||-
>> ||Path	   ~~ search()
>>
>> Please Advise,
>> KeithC.
>>
>> ______________________________________________
>> R-help at stat.math.ethz.ch mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide!
> http://www.R-project.org/posting-guide.html
>>
>>
>
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595