logback-android/src/main/java/ch/qos/logback/core/pattern/parser/Parser.java
public Converter<E> compile(final Node top, Map<String, String> converterMap) {
    Compiler<E> compiler = new Compiler<E>(top, converterMap);
    compiler.setContext(context);
    //compiler.setStatusManager(statusManager);
    return compiler.compile();
  }
public Converter<E> compile(final Node top, Map<String, String> converterMap) {
    Compiler<E> compiler = new Compiler<E>(top, converterMap);
    compiler.setContext(context);
    //compiler.setStatusManager(statusManager);
    return compiler.compile();
  }
When the parsing step is done, the Node list can be transformed into a
converter chain.

@param top the top node
@param converterMap converter map
@return the converter chain