antlr-directory-dependencies is a compiled Lisp function in `
Return dependencies for all grammar files in directory DIRNAME.
The result looks like ((CLASS-SPEC ...) . (FILE-DEP ...))
where CLASS-SPEC = (CLASS (FILE . EVOCAB) ...).
FILE-DEP are the dependencies for each grammar file in DIRNAME, see
`antlr-file-dependencies'. For each grammar class CLASS, FILE is a
grammar file in which CLASS is defined and EVOCAB is the name of the
export vocabulary specified in that file.