On 2003.12.15, Tom Jackson <[EMAIL PROTECTED]> wrote:
> I'm trying to see if a value is an integer, using:
>
> if {[string is integer "${var}"]} {
> do something
> }
>
> When var is the empty string it returns true, so I have to use:
>
> if {!("" eq "${var}) && ...
>
> Is this a bug, or expected behavior?
Expected behavior. Read the docs for [string]. The short-hand for what
you want might look like this:
if {[string is integer " $var"]} {
... do something ...
}
Note the leading whitespace. When $var is an empty string, this will
return 0. Otherwise, if $var contains a valid integer, it'll return 1,
as [string is integer $str] ignores leading and trailing whitespace.
However, a non-empty string that contains no integer isn't an integer,
so the test does what you're expecting it to.
-- Dossy
--
Dossy Shiobara mail: [EMAIL PROTECTED]
Panoptic Computer Network web: http://www.panoptic.com/
"He realized the fastest way to change is to laugh at your own
folly -- then you can let go and quickly move on." (p. 70)
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