Get modifiers from class - rascal

Question

I'm trying to get all the modifiers from a class in Rascal.
m = createM3FromEclipseProject(projectLocation);
for(cl <- classes(m)){
set[Modifier] modi = { f | f <- m#modifiers[cl], f.scheme == "java+class"};
println(modi);
}
This gives me an empty set of modifiers for all classes, but if I check m#modifiers, it is not empty.
So m#modifiers[cl] won't give me the modifiers that belong to that the class with location cl. How do I get these modifiers?

Answer 1

Something's wrong with the code you presented. If you try to do it step by step on the REPL you will see why:
For an example project with Fruit and such extracted into the M3 model m I have this:
rascal>classes(m)
set[loc]: {
|java+class:///Fruit|,
|java+class:///Apple|,
|java+class:///HelloWorld|
}
rascal>m#modifiers
rel[loc definition,Modifier modifier]: {
<|java+interface:///IFruit|,public()>,
<|java+method:///HelloWorld/main(java.lang.String%5B%5D)|,static()>,
<|java+class:///Fruit|,abstract()>,
<|java+method:///Apple/edible()|,public()>,
<|java+method:///Fruit/edible()|,public()>,
<|java+class:///Apple|,public()>,
<|java+method:///HelloWorld/main(java.lang.String%5B%5D)|,public()>,
<|java+class:///HelloWorld|,public()>,
<|java+method:///Fruit/edible()|,abstract()>,
<|java+class:///Fruit|,public()>
}
So m#modifiers[someClass] returns a set of modifiers:
rascal>m#modifiers[|java+class:///Fruit|]
set[Modifier]: {
abstract(),
public()
}
In your code f <- m#modifiers[cl] the f thus binds to a modifier and not to a source location. Somehow the code does not throw an exception but rather lets the condition fail for you? Because I get this result instead:
rascal>{ f | cl <- classes(m), f <- m#modifiers[cl], f.scheme == "java+class"};
|prompt:///|(46,1,<1,46>,<1,47>): Undeclared field: scheme for Modifier
Advice: |http://tutor.rascal-mpl.org/Errors/Static/UndeclaredField/UndeclaredField.html|
If you want to print the modifiers for each class, then this code should do it:
for (cl <- classes(m)) {
println("modifiers for <cl> are <m#modifiers[cl]>");
}