Floating point numbers

Permanently deleted user

Created April 23, 2015 07:27

There is a native integer type in MPS. Is there also a Double or a Float type? I couldn't find one.

Thanks in advance!

Regards
mschalk

5 comments

Vaclav Pech

Created April 23, 2015 07:34

I guess you mean types for properties in language structure definition - yes, there are types derived from string and constraining the values by a regex:

_FPNumber_String for doubles
_FloatNumberValue for floats

Cheers,

Vaclav

Permanently deleted user

Created April 23, 2015 07:54

Thanks for your reply Vaclav!
I added the jetbrains.mps.lang.structure + jetbrains.mps.baseLanguage to my own language.
However I can't define the mentioned Types from above for my property in structure definition.

Vaclav Pech

Created April 23, 2015 08:08

It could be because your structure model misses a dependency on j.m.baselanguage.structure. You may try Control/Cmd + R and type _FPNumber_String - this could set the dependencies for you.

Vaclav

Permanently deleted user

Created April 23, 2015 08:16

Thank you for your help, Vaclav!
Finally it's working!

Permanently deleted user

Created May 23, 2019 14:53

This will actually provide you with a string representing a (floating point) number, which can then be parsed through Double.parseDouble and related functions.

Is it possible to add Java behavior to these constrained string representations, so that we can avoid the boilerplate Double.parseDouble (and e.g. provide a default null when a NumberFormatError is thrown)

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