James DeVain writes:
Hi, everyone. I'm using the "{(calc)}" recipe at
Cookbook/MarkupExpressionSamples. I'm
trying to do this:
(:gen:4708003830:)
{(calc '(substr {$:gen} 0 -8) + 3')}
which should return 50, but I just get "input error!". I've tried it a bunch
of different
ways, but nothing works so far. Might be worth mentioning that if I use the
"{(math)}"
recipe (from the same page), as in:
{(math (substr {*$:gen} 0 -8) + 3)}
Remove the single quotes. To nest markup expressions use
{(func1 (func2 12 6 (func3 5)) )}
If you use quotes, the stuff in quotes is not searched for nested markup
expressions.
OTOH if you do arithmetic calculations, you may have to use parentheses, and
parentheses indicate sub-expressions. Two ways to use arithmetic parentheses
without quotes and without the markup expressions engine to break:
{(calc 25 + ( {$:stuff}-0) )} use a space after the ( parenthese
{(calc 25 + (calc {$:stuff}-0) )} use an actual sub-expression
Petko
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