Lack of support for fractional timescales

[Lampus]

I have VCD file dumped from Cadence Simvision viewer with less than femtosecond timescale:

$comment
TOOL:   simvision(64)   19.03-s012
$end

$date
    Jun 22, 2021 11:14:06
$end

$timescale
    0.001fs
$end


$scope module tb_top $end

Parsing of this file is failed with next error:

Error: Magnitude of timescale must be one of 1, 10, or 100.
Current magnitude is: 0

Used workaround:

...
magnitude = Decimal(re.findall(r"\d+(\.\d+)?|$", timescale)[0])
                if magnitude not in [Decimal('0.001'), 1, 10, 100]:
...

[samimia-swks]

I see the same issue. @cirosantilli can you please apply this fix?

[samimia-swks]

@cirosantilli to clarify, you already removed the error, but the problem is that this regex
magnitude = Decimal(re.findall(r"\d+|$", timescale)[0])
fails to parse 0.001fs as 0.001. It results in magnitude = 0 instead.

What @Lampus suggested, i.e.
Decimal(re.findall(r"\d+(\.\d+)?|$", timescale)[0])
seems to work

[cirosantilli]

Fixed and released on v2.3.6, let me know if any issues remain with this.