Re: [v8-users] BigInt from String?
On Sat, Sep 15, 2018 at 10:38 PM Jakob Kummerow
wrote:
> To create arbitrary BigInts via the C++ API, use BigInt::NewFromWords.
>
maybe this is a new method; it wasn't available, and would require
preparsing to get an array of native values.
>
> An alternative, as you suggest, is to parse the string as source, because
> "BigInt strings with 'n' suffixes" are BigInt literals. Instead of "eval",
> the API functions to do that are Script::Compile and Script::Run. Look at
> samples/shell.cc or test/cctest/* for examples.
>
That works simply enough.
Would still have just preferred to have like ::NewFromUtf8 methods on Date
and BigInt; this seems like a LOT more overhead.
case JSOX_VALUE_BIGINT:
// just pass the string as is.
script = Script::Compile( String::NewFromUtf8( revive->isolate,
val->string, NewStringType::kNormal, val->stringLen ).ToLocalChecked()
, String::NewFromUtf8( revive->isolate, "BigIntFormater",
NewStringType::kInternalized ).ToLocalChecked() );
result = script->Run();
break;
case JSOX_VALUE_DATE:
char buf[64];
snprintf( buf, 64, "new Date('%s')", val->string );
script = Script::Compile( String::NewFromUtf8( revive->isolate, buf,
NewStringType::kNormal ).ToLocalChecked()
, String::NewFromUtf8( revive->isolate, "DateFormater",
NewStringType::kInternalized ).ToLocalChecked() );
result = script->Run();
break;
> Another alternative, depending on your requirements, might be to create
> this custom "parser" (more of a wrapper, really) in JavaScript:
>
> function MyBigInt(str) {
> console.assert(str.endsWith("n"));
> return BigInt(str.substring(0, str.length - 1));
> }
>
>
> On Sat, Sep 15, 2018 at 8:44 PM J Decker wrote:
>
>>
>>
>> On Sat, Sep 15, 2018 at 8:41 PM J Decker wrote:
>>
>>> I was implementing a parser that includes BigInt strings with 'n'
>>> suffixes...
>>> I tried to create a BigInt::New( isolate, ... and then found the only
>>> constructor takes an int64; which isn't a very big int.
>>>
>>> howto bigint from string?
>>>
>>
>> maybe someone could share a snippet to call eval()? Also Date::New()
>> doesn't take a string :(
>>
>>
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Re: [v8-users] BigInt from String?
To create arbitrary BigInts via the C++ API, use BigInt::NewFromWords.
An alternative, as you suggest, is to parse the string as source, because
"BigInt strings with 'n' suffixes" are BigInt literals. Instead of "eval",
the API functions to do that are Script::Compile and Script::Run. Look at
samples/shell.cc or test/cctest/* for examples.
Another alternative, depending on your requirements, might be to create
this custom "parser" (more of a wrapper, really) in JavaScript:
function MyBigInt(str) {
console.assert(str.endsWith("n"));
return BigInt(str.substring(0, str.length - 1));
}
On Sat, Sep 15, 2018 at 8:44 PM J Decker wrote:
>
>
> On Sat, Sep 15, 2018 at 8:41 PM J Decker wrote:
>
>> I was implementing a parser that includes BigInt strings with 'n'
>> suffixes...
>> I tried to create a BigInt::New( isolate, ... and then found the only
>> constructor takes an int64; which isn't a very big int.
>>
>> howto bigint from string?
>>
>
> maybe someone could share a snippet to call eval()? Also Date::New()
> doesn't take a string :(
>
>
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>> v8-users@googlegroups.com
>> http://groups.google.com/group/v8-users
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>> email to v8-users+unsubscr...@googlegroups.com.
>> For more options, visit https://groups.google.com/d/optout.
>>
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Re: [v8-users] BigInt from String?
On Sat, Sep 15, 2018 at 8:41 PM J Decker wrote: > I was implementing a parser that includes BigInt strings with 'n' > suffixes... > I tried to create a BigInt::New( isolate, ... and then found the only > constructor takes an int64; which isn't a very big int. > > howto bigint from string? > maybe someone could share a snippet to call eval()? Also Date::New() doesn't take a string :( > -- > -- > v8-users mailing list > v8-users@googlegroups.com > http://groups.google.com/group/v8-users > --- > You received this message because you are subscribed to the Google Groups > "v8-users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to v8-users+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- -- v8-users mailing list v8-users@googlegroups.com http://groups.google.com/group/v8-users --- You received this message because you are subscribed to the Google Groups "v8-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to v8-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[v8-users] BigInt from String?
I was implementing a parser that includes BigInt strings with 'n' suffixes... I tried to create a BigInt::New( isolate, ... and then found the only constructor takes an int64; which isn't a very big int. howto bigint from string? -- -- v8-users mailing list v8-users@googlegroups.com http://groups.google.com/group/v8-users --- You received this message because you are subscribed to the Google Groups "v8-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to v8-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
