ParseTrees.java 文件源码

public static Interval getSourceInterval(@NonNull ParseTree context) {
    Parameters.notNull("context", context);

    if (context instanceof TerminalNode) {
        TerminalNode terminalNode = (TerminalNode)context;
        Token token = terminalNode.getSymbol();
        return new Interval(token.getStartIndex(), token.getStopIndex());
    } else if (context instanceof RuleNode) {
        RuleNode ruleNode = (RuleNode)context;
        RuleContext ruleContext = ruleNode.getRuleContext();
        if (ruleContext instanceof ParserRuleContext) {
            return getSourceInterval((ParserRuleContext)ruleContext);
        } else {
            Token startSymbol = getStartSymbol(context);
            Token stopSymbol = getStopSymbol(context);
            if (startSymbol == null || stopSymbol == null) {
                return Interval.INVALID;
            }

            return new Interval(startSymbol.getStartIndex(), stopSymbol.getStopIndex());
        }
    } else {
        return Interval.INVALID;
    }
}