Trees.java 文件源码

public static String getNodeText(@NotNull Tree t, @Nullable List<String> ruleNames) {
    if ( ruleNames!=null ) {
        if ( t instanceof RuleNode ) {
            int ruleIndex = ((RuleNode)t).getRuleContext().getRuleIndex();
            String ruleName = ruleNames.get(ruleIndex);
            return ruleName;
        }
        else if ( t instanceof ErrorNode) {
            return t.toString();
        }
        else if ( t instanceof TerminalNode) {
            Token symbol = ((TerminalNode)t).getSymbol();
            if (symbol != null) {
                String s = symbol.getText();
                return s;
            }
        }
    }
    // no recog for rule names
    Object payload = t.getPayload();
    if ( payload instanceof Token ) {
        return ((Token)payload).getText();
    }
    return t.getPayload().toString();
}