Grammar.java 文件源码

/** Given an arbitrarily complex SemanticContext, walk the "tree" and get display string.
 *  Pull predicates from grammar text.
 */
public String getSemanticContextDisplayString(SemanticContext semctx) {
    if ( semctx instanceof SemanticContext.Predicate ) {
        return getPredicateDisplayString((SemanticContext.Predicate)semctx);
    }
    if ( semctx instanceof SemanticContext.AND ) {
        SemanticContext.AND and = (SemanticContext.AND)semctx;
        return joinPredicateOperands(and, " and ");
    }
    if ( semctx instanceof SemanticContext.OR ) {
        SemanticContext.OR or = (SemanticContext.OR)semctx;
        return joinPredicateOperands(or, " or ");
    }
    return semctx.toString();
}