Re: [Configobj-develop] configObj validation/interpolation design defect

[Michael H. <ma...@ma...>]

Am 11.12.2009 um 15:32 schrieb Michael Foord:
...
>> The spec is:
>>
>> axis3_safe_margin = string(default= "%(ax3_letter)s safety margin
>> [mm]:")
>>
>> The task is:
>> - if the default ini file does not exist, generate it from the spec.
>> - when reading the default .ini back in, I want the string equivalent
>> as generated by:
>>
>> <foo>.axis3_safe_margin = "%(ax3_letter)s safety margin [mm]:"
>> ---------------------------^^^^^^^^^^^^^ note - no mutilation here
...

> Have you tried the interpolation attribute? Does that not work?

Not for me. See attached example below which shows what I'm referring  
to. interpolation=False in the ConfigObj constructor, and I didnt find  
a way to express that extra for the validator.

The problem seems to be the validate() function which insists on  
interpolating even if interpolation=False, and this should be fixed.

Version was 4.6.0 .

> http://www.voidspace.org.uk/python/configobj.html#interpolation
>
> Try setting it to False before validation and then back to True  
> after. It can also be passed as a keyword argument to the ConfigObj  
> constructor.
>
> Also you are incorrect that interpolation is only done against the  
> DEFAULT section. Version 4.4 contained a lot of improvements to the  
> interpolation engine and I believe this was one of the changes:

Technically you are right - interpolation works against several  
sections - inner to outer.

My point is: Insisting exclusively on intra-file interpolation between  
variables and formats - and copping out if a format cant be  
interpolated - is very limiting in the sense of what you can  
interpolate against (e.g. my program's variables, options, path etc )  
once you want to actually use these variables.

My suggestion is to provide a way to turn interpolation in the  
validator off completely, even in the validate() function.

I would really appreciate a solution for this.

thanks in advance

Michael



>
> http://www.voidspace.org.uk/python/configobj.html#version-4-4-0
> http://www.voidspace.org.uk/python/configobj.html#string-interpolation
>
> """
> Interpolation checks first the current section to see if name is the  
> key to a value. ('name' is case sensitive).
>
> If it doesn't find it, next it checks the 'DEFAULT' sub-section of  
> the current section.
>
> If it still doesn't find it, it moves on to check the parent section  
> and the parent section's 'DEFAULT' subsection, and so on all the way  
> up to the main section.
> """
>
>
> All the best,
>
> Michael Foord
>> my suggestion: an interpolation=(True|False) parameter to validate()
>> and please leave my strings untouched...
>>
>>
>> thanks un advance
>>
>> Michael
>>
>>
>>
>>
>>
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