* Locate the grammar file metadata by grammar file path.
     *
     * @param path The grammar file path.
     * @return The grammar file metadata.  May be null if none found.
     */
    public GrammarFileMetadata getGrammarFileByPath(String path) {
        return filesByPath.get(path);
    }

    /**
     * Locate the grammar file metadata by the name of a class generated from one of its included grammars.
     *