InputPanel.java 文件源码

public void setCursorToGrammarElement(Project project, PreviewState previewState, int offset) {
    Token tokenUnderCursor = ParsingUtils.getTokenUnderCursor(previewState, offset);
    if ( tokenUnderCursor==null ) {
        return;
    }

    PreviewParser parser = (PreviewParser) previewState.parsingResult.parser;
    Integer atnState = parser.inputTokenToStateMap.get(tokenUnderCursor);
    if ( atnState==null ) { // likely an error token
        //LOG.error("no ATN state for input token " + tokenUnderCursor);
        return;
    }

    Interval region = previewState.g.getStateToGrammarRegion(atnState);
    CommonToken token =
        (CommonToken) previewState.g.tokenStream.get(region.a);
    jumpToGrammarPosition(project, token.getStartIndex());
}