Hello list,
I'm new at TT. After RTFMing i've tried to do macros that manipulate
lists and I've realized that I haven't understood how TT macros work.
Could you please tell me why the following constructs that look
equivalent to me behave so differently? What have I missed?
1) MACRO CAN'T RETURN A LIST: I can't use a macro that expands to a
list in a loop. see this simple example:
[% list = [1..5] %]
[%
MACRO macro_list BLOCK;
list;
END;
%]
list:
[%
FOREACH element IN list ;
"$element ";
END;
%]
macro:
[%
FOREACH element IN macro_list ;
"$element ";
END;
%]
Which gives the following output ( I would expect the same output in
both cases )
list:
1 2 3 4 5
macro:
ARRAY(0x843900c)
2) LIST MANIPULATION: straightforward list manipulation is ignored
inside MACRO, i need to resort to Virtual Methods. example list = [
1..5] doesn't work, I have to do list.splice + list.push inside a loop
like shown below:
[%
MACRO initialize_push BLOCK;
devnull = list.splice(0);
FOREACH num IN [ 10..15 ] ;
list.push(num) ;
END;
END;
%]
[%
MACRO initialize_simple BLOCK;
list = [ 6..10 ] ;
END;
%]
[%
MACRO show_list BLOCK;
FOREACH element IN list;
"$element ";
END;
END;
%]
manual initialization
[%
list = [ 1..5 ];
show_list;
%]
initialization with macro
[%
initialize_simple;
show_list;
%]
initialization with push macro
[%
initialize_push;
show_list;
%]
The output of this macro is
manual initialization
1 2 3 4 5
initialization with macro
1 2 3 4 5
initialization with push macro
10 11 12 13 14 15
And I had expected
manual initialization
1 2 3 4 5
initialization with macro
6 7 8 9 10
initialization with push macro
10 11 12 13 14 15
Thank you very much for your time,
Francesc
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