I've been into toying with run prefixes for my filters, to see what I can
now do with them.
I've been able to have an equivalent of "if not A then B" but I've not been
able to get "if A then B". the + or :and prefix is not a logical AND at all
but just a way to replace all currents stuff in the pipe with new contents.
Part of the problem is I can't produce NOT A. I mean, see this example:
{{{
cobalt great gaz :filter[split[]match[r]]
+[!is[blank]then[]else["great" void]]
~Expected
}}}
{{{
cobalt fox gaz :filter[split[]match[r]]
+[!is[blank]then[]else["fox" void]]
~Unexpected
}}}
The only output is "fox" void. I expected that the first filter output be
Expected.
As a kind of check with
{{{
cobalt great gaz :filter[split[]match[r]]
~Expected
}}}
{{{
cobalt fox gaz :filter[split[]match[r]]
~Unexpected
}}}
the output is
great
Unexpected
which is totally what we thought we should have.
The same also happens with
cobalt great gaz :filter[split[]match[r]]
+[!is[blank]]
~Expected
}}}
{{{
cobalt fox gaz :filter[split[]match[r]]
+[!is[blank]]
~Unexpected
}}}
Again, that's OK. Maybe that's because [] is not a blank input? But
{{{ [[]] +[!is[blank]then[Full]else[Empty]] }}}
does indeed output Empty as expected so I'm really confused now...
BTW, in real life, in "if A then B" my B is not a constant, in which case I
would have used [A]!is[blank]then[B] but a complex run. I know I can have a
function or variable as my B to get around the difficulty, but that is not
what I want to do here.
--
Jean-Pierre
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