Difference between revisions of "Evaluation brackets"
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Now lets see how it works out in more complex forms. | Now lets see how it works out in more complex forms. | ||
echo -a [ %a $+ [ %b ] ] | echo -a [ %a $+ [ %b ] ] | ||
| − | This would echo "sometext%a" In this case %a is evaluated once and so is %b. Note that echoing [ %a $+ %b ] | + | This would echo "sometext%a" In this case %a is evaluated once and so is %b. Note that echoing [ %a $+ %b ] won't work. |
echo -a [ %a $+ [ [ %b ] ] ] | echo -a [ %a $+ [ [ %b ] ] ] | ||
This would echo "sometextsometext" since %a is evaluated once and %b twice. | This would echo "sometextsometext" since %a is evaluated once and %b twice. | ||
Revision as of 23:27, 5 July 2006
Controles evaluation of identifiers / variables
[ string ]
The evaluation brackets work a bit like $eval though you can add multiple things to evaluate at different levels at once.
Example:
var %a = sometext var %b = % $+ a
Now %a is "sometext" and %b is "%a"
echo -a [ %b ]
This would echo "%a" since %b is evaluated once. Note that this is the same as just echoing %b
echo -a [ [ %b ] ]
This would echo "sometext" since %b is first evaluated to "%a" and then %a is evaluated to "sometext".
Now lets see how it works out in more complex forms.
echo -a [ %a $+ [ %b ] ]
This would echo "sometext%a" In this case %a is evaluated once and so is %b. Note that echoing [ %a $+ %b ] won't work.
echo -a [ %a $+ [ [ %b ] ] ]
This would echo "sometextsometext" since %a is evaluated once and %b twice.
Another example:
var %name = fish var %surname = bot set % [ $+ [ %name ] $+ . $+ [ %surname ] ] m00
This would set %fish.bot to m00.
