SID-00188: How to set variables for a topic hierarchy?

Status:	Answered	TWiki version:	4.0.4	Perl version:
Category:	CategoryRendering	Server OS:		Last update:	16 years ago

I'd like to set variables in a topic whose values were propagate to all sub-topics in topic hierarchy. I tried %INCLUDE% including a page with the settings with no success... Is there any way to do that?

-- WeberSotomba - 13 Mar 2009

Discussion and Answer

An INCLUDEd page does not inherit variables.

As a workaround you can use a SpreadSheetPlugin VarCALC: $SET() a variable in the INCLUDEd page, and $GET() the variable in the including page. See working example at Sandbox.SpreadSheetRollupTest.

-- PeterThoeny - 13 Mar 2009

It worked indeed. I tried another approach using a more regular var setting, like this:

<!--
VAR=0304
-->

It worked but the var "importing" is quite clumsy:

   * Set VAR = %<nop>INCLUDE{"SetIncludedVarsSet" pattern=".*?VAR=(\S+).*"}%

There is a more complete example on SetIncludedVars .

It seems to me that a good solution would be some way to evaluate Set VAR = <value> statements that would be dynamically created by an %EXTRACT{"SetIncludedVarsSet"}% command.

Obviously I have no clue if it is feasible

-- WeberSotomba - 14 Mar 2009

See also proposed feature to MakingVarVARTopicCapable.

-- PeterThoeny - 16 Mar 2009

Right, that is a better way of importing a single variable. But to import a bunch of vars, it seems that a good way (if system architecture allows that) would be some kind of routine to evaluate a string in the current topic, alike the Perl eval() routine. For instance:

   %STR_EVAL("   * Set VAR = 0304$n   * Set VAR2 = \"This string\"")%

The string could be generated by a %EXTRACT{}% processing the topic with the var settings.

Is this feasible? This routine would have a number of other uses, I guess.

Tks for your assistance.

-- WeberSotomba - 16 Mar 2009

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