Groups > comp.soft-sys.math.mathematica > #2072

Re: Remove MakeExpression settings

From	Peter Breitfeld <phbrf@t-online.de>
Newsgroups	comp.soft-sys.math.mathematica
Subject	Re: Remove MakeExpression settings
Date	2011-05-03 12:23 +0000
Organization	Steven M. Christensen and Associates, Inc and MathTensor, Inc.
Message-ID	<ipos3l$i41$1@smc.vnet.net> (permalink)
References	<ipm2f1$58n$1@smc.vnet.net> <ipoipp$g2j$1@smc.vnet.net>

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David Bailey wrote:

> On 02/05/2011 11:53, Peter Breitfeld wrote:
>> I made some settings using MakeExpression and MakeBoxes. Suppose I use
>>
>> beautyOut[a_]:=MakExpression[...]
>>
>> I can find these definitions in Definition[MakeBoxes] and
>> Definitions[MakeBoxes].
>>
>> Sometimes I want to switch off these definitions. The only way I found
>> is to use Quit.
>>
>> My question:
>> Is it possible, to remove the definitions made from the set of
>> definitons of MakeExpression and Makeboxes?
>>
>> Thank you
>> Peter
> One possibility is not to remove them but activate/deactivate them based 
> on a global variable
>
> mySwitch=True;
>
> MakeExpression[...,StandardForm]:=Module[.............]/;mySwitch;
>
> Set up this way, they can be activated/deactivated at will.
>
> David Bailey
> http://www.dbaileyconsultancy.co.uk
>

Thanks to David and John!

I now use the following approach. The Definitions are strored in
FormatValues[MakeBoxes] and FormatValues[MakeExpression]. I now maintain
a list "beautyList" which contains all Symbols I want beauty.

I have a Definition defBeauty[a_], which makes setting in MakeBoxes and
MakeExpression. To find these definitions in the FormatValues list, I
add a nonsense form to the form parameter of MakeBoxes/Expression. e.g.

MakeBoxes[bla, form:StandardForm|TraditionalForm|WEIRD]...

The function undefBeauty[a] now looks for the pattern WEIRD, deletes the
entry in FormatValues[...], removes a from beautyList and calls
defBeauty for all remaining entries in beautyList. This works quite good. 

-- 
_________________________________________________________________
Peter Breitfeld, Bad Saulgau, Germany -- http://www.pBreitfeld.de

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Remove MakeExpression settings Peter Breitfeld <phbrf@t-online.de> - 2011-05-02 10:53 +0000
  Re: Remove MakeExpression settings David Bailey <dave@removedbailey.co.uk> - 2011-05-03 09:44 +0000
    Re: Remove MakeExpression settings Peter Breitfeld <phbrf@t-online.de> - 2011-05-03 12:23 +0000

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