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Postings from February 2022
On Wed, Feb 23, 2022 at 11:03:14PM +0100, Graham Knop wrote:
> For serializers, being able to detect the original type of a value is
> essential, so it would help to provide functions to provide this
> information. For example, providing builtin::isnumber and
> builtin::isstring, to go along with builtin::isbool.
One issue that comes to mind is that of round-tripping.
JSON, when read by Perl, is just text. Actually, all input that we don't
parse from Perl source code is always text, right?
When parsing `{ "a" : 2, "b": "c" }`, all that Perl reads is text. How
would a pure Perl JSON parser decode that `2` from the input source and
keep it in memory as if it was always the number 2?
I guess something like the following would work:
# from parsing the JSON text, we end up with:
# $key = "a"
# $num = "2"
$json->{$key} = 0+ $num;
# and when parsing the next element:
# $key = "b"
# $str = "c"
$json->{$key} = "$str";
Is this how we're expected to *set* the initial type of a scalar when
it's obtained from outside input (not source code)?
--
Philippe Bruhat (BooK)
Where there are hearts of gold, there is no need for bars of steel.
(Moral from Groo The Wanderer #103 (Epic))
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