ParseTrees.java 文件源码

public static Interval getSourceInterval(@NonNull ParserRuleContext context) {
    Parameters.notNull("context", context);
    int startIndex = context.start.getStartIndex();
    Token stopSymbol = getStopSymbol(context);
    if (stopSymbol == null) {
        return new Interval(startIndex, startIndex - 1);
    }

    int stopIndex;
    if (stopSymbol.getType() != Token.EOF) {
        stopIndex = stopSymbol.getStopIndex();
    } else {
        TokenSource tokenSource = context.getStart().getTokenSource();
        CharStream inputStream = tokenSource != null ? tokenSource.getInputStream() : null;
        if (inputStream != null) {
            stopIndex = inputStream.size() - 1;
        } else {
            stopIndex = context.start.getStartIndex() - 1;
        }
    }

    stopIndex = Math.max(stopIndex, startIndex - 1);
    return new Interval(startIndex, stopIndex);
}