public List<File> getNonImportDependenciesFileList() {
        List<File> files = new ArrayList<File>();

        // handle token vocabulary loads
        String tokenVocab = g.getOptionString("tokenVocab");
        if (tokenVocab != null) {
			String fileName =
				tokenVocab + CodeGenerator.VOCAB_FILE_EXTENSION;
			File vocabFile;
			if ( tool.libDirectory.equals(".") ) {
				vocabFile = new File(fileName);
			}
			else {
				vocabFile = new File(tool.libDirectory, fileName);
			}
			files.add(vocabFile);
		}

        return files;
    }
Return a list of File objects that name files ANTLR will read
to process T.g; This can only be .tokens files and only
if they use the tokenVocab option.

@return List of dependencies other than imported grammars
tool/src/org/antlr/v4/tool/BuildDependencyGenerator.java