I just updated the TiddlyWiki. The related javascript macro, I had locked
it down to make sure nothing other than `"0123456789 ()+-*/%"` would be
accepted, but I had totally forgotten about decimals.
So now the javascript is locked down to make sure nothing other than
`"*0123456789
.()+-*/%*"` is accepted.
So now this works:
`<<EvalThis "{{{ [[25.9]] }}} * ( 1 + ( {{{ [[15%]removesuffix[%]] }}} /
100 ) )">>`
i.e.
`<<EvalThis "{{ item_price }} * ( 1 + ( {{( [[tax_rate]removesuffix[%]] })}
/ 100 ) )">>`
On Saturday, March 12, 2022 at 2:51:47 PM UTC-4 Charlie Veniot wrote:
> After a bit of discussion over on TiddlyTalk
> <https://talk.tiddlywiki.org/t/what-are-current-options-for-plain-arithmetic/2699/12>,
>
> I've resolved a security issue and feel good enough about the little
> solution for lengthy/complex (but primitive only) arithmetic expressions.
>
> In this sample TiddlyWiki instance
> <https://cjveniot.neocities.org/TiddlyWikiEvalThisMacro.html>, you'll
> find the following two tiddlers needed:
>
>
> - Eval.js (the javascript eval function, locked to only allow the
> characters (excluding the double quotes) "0123456789 ()+-*/%"
> - EvalThis tiddler with the EvalThis macro.
>
>
> Although I can't stand javascript, I am not fussy about TiddlyWiki filter
> operations for lengthy/complex basic arithmetic, and not really fond of
> bringing in any of the powerful plugins out there when I don't need that
> much oomph.
>
> Some sample macro references:
>
> `
> <<EvalThis "(100 + 2) / (9 - 1)">>
>
> <<EvalThis "59 % 3">>
>
> <<EvalThis "5**3">>
>
> <<EvalThis "( {{!!a}} * {{!!b}} ) / 2">>
>
> <$list filter="[range[25]]"> {{!!title}} / 2 = <<EvalThis "{{!!title}} /
> 2">><br> </$list>
> `
>
>
>
>
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