Support constant definitions

[GorbadPS3]

I have been following a youtube tutorial for SysML v2: https://www.youtube.com/watch?v=2FWxUGlkrE0

In it, "reindeer nose color" has been define as a constant , like this:

    ref part r8 subsets reindeer { constant redefines noseColor = Color::gold; }

    part def Reindeer {
        constant noseColor : Color;
        attribute energyLevel : Real default := 100.0;
    }

An example sysml v2 file according to the tutorial looks like this:

Before_SysON_Import_L02_SantaSleigh.txt

However, after importing it to SysON and exporting it back to a sysml text document, it appears like this:

After_SysON_Export_L02_SantaSleigh.txt

    ref part r8 :> reindeer {
        'constant' :>> noseColor = Color::gold;
    }

    part def Reindeer {
        'constant';
        noseColor : Color;
        attribute energyLevel : Real default := 100.0;
    }

As you can see, the "constant" keyword is somehow parsed into its own line, which completely breaks the sysml v2 model. It also gets quotation-marks around it.

It looks like the constant keyword isn't supported by SysON?

[GorbadPS3]

Note:

The same happens if we define constants like this:

    part def Reindeer {
        constant attribute noseColor : Color;
        attribute energyLevel : Real default := 100.0;
    }

SysON exports the definition as:

	part def Reindeer {
		'constant';
		attribute noseColor : Color;
		attribute energyLevel : Real default := 100.0;
	}

[AxelRICHARD]

Hello,

Thank you for raising this issue.

Our export to text module is not perfect, we try to improve it release after release.
We will try to fix this problem in the next releases.

Regards,

[GorbadPS3]

@AxelRICHARD I actually think this might be a problem beyond the export, because the attributes also show up strange in the SysON UI:

This sysml definition:

    part def Reindeer {
        constant attribute noseColor : Color;
        attribute energyLevel : Real default := 100.0;
    }

Is shown in SysON as:

i.e. the "constant" is a separate attribute / connection / item, even though it's supposed to be a property of the "noseColor" attribute.

Further, if drag the item to the view:

Or look at its advanced tab:

We see that the "Is Constant" is not checked, even though the sysml defined it as a constant. If we manually check the "constant" box to true, then the item is exported semi-correctly as:

	part def Reindeer {
		'constant';
		constant attribute noseColor : Color;
		attribute energyLevel : Real default := 100.0;
	}

This to me suggests that it's actually the -import- logic that doesn't correctly flag the attribute as a constant.

[AxelRICHARD]

This second problem you described seems related to the import module, the one who allows to create a model from a textual SysMLv2 file of piece of text. You can create a separate issue for this second problem.