On 23/06/08 19:37, Andy Armstrong wrote:
> On 23 Jun 2008, at 18:34, Gautam Iyer wrote:
>>> Doesn't that allow '+-3' ?
>> This seems to go unnoticed in some other languages too (e.g. Python).
>
>
> I assume that's because they support unary '+' as an operator. It's
> not part of the numeric constant:
>
> >>> print +(1+2)
> 3
> >>> print ++++++(1+2)
> 3
> >>> print ---1
> -1
>
Vim supports both + and - as unary operators, but apparently it supports
-3 but not +3 as a single numeric token. (Where an expression is
expected, +3 is accepted as the operator + acting on the number 3.)
For instance:
:echo str2nr('-3')
-3
:echo str2nr('+3')
0
:echo str2nr('--3')
0
:echo eval('-3')
-3
:echo eval('+3')
3
:echo eval('--3')
3
The difference is that str2nr() expects the string-form of a Number,
eval() expects the string-form of an expression.
I suppose that now that we know it, we can live with it.
Best regards,
Tony.
--
Baltimore, n.:
Where the women wear turtleneck sweaters to hide their flea
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