.travis.yml: Add *.json file validation

[versat]

No description provided.

[versat]

./naming.json:5:8: Error: Values must be separated by a comma
   |  At line 5, column 8, offset 103
   |  Array started at line 3, column 12, offset 48
./naming.json: has error

Validation works. I will add a commit fixing naming.json.

[versat]

After fixing naming.json Travis prints a lot of naming violations, for example

lib/importproject.h:115:11: warning: Variable ProjectElementName violates naming convention [naming-varname]
    const char ProjectElementName[] = "project";
          ^
lib/importproject.h:116:11: warning: Variable ProjectVersionAttrib violates naming convention [naming-varname]
    const char ProjectVersionAttrib[] = "version";
          ^
...

@danmar Was the error in naming.json intended? Why does Cppcheck happily parse such a file that obviously does not work? Is that intended too?
The Travis command that also checks for naming violations is in line 216.

[danmar]

the error in naming.json was not intended.

Why does Cppcheck happily parse such a file that obviously does not work? Is that intended too?

why shouldn't it parse that file?

[versat]

why shouldn't it parse that file?

What I mean is that I wonder if Cppcheck should better exit with an error message if a. json file is erroneous instead of using only some part of the .json without any warning.
I would expect a program to issue an error message and exit with an error code if an input file is invalid. This gives the user the chance to detect and fix the error instead of getting wrong results without knowing that they are wrong.

Maybe picojson has the functionality to detect errors. I can see if we can use that.
I suggest to first fix it inside Cppcheck and only then add the external json validation from this PR.

[danmar]

I would expect a program to issue an error message and exit with an error code if an input file is invalid.

I agree!

[amai2012]

Should this be merged now?

[versat]

Should this be merged now?

Yes, thanks for reminding me.