StructuredQueryParser.java 文件源码

public StructuredQuery parse(String query) throws ParseCancellationException {
    GraphflowLexer lexer = new GraphflowLexer(CharStreams.fromString(query));
    lexer.removeErrorListeners();   // Remove default listeners first.
    lexer.addErrorListener(ErrorListener.INSTANCE);

    GraphflowParser parser = new GraphflowParser(new CommonTokenStream(lexer));
    parser.removeErrorListeners();   // Remove default listeners first.
    parser.addErrorListener(ErrorListener.INSTANCE);

    try {
        ParseTree tree = parser.graphflow();
        GraphflowVisitor visitor = new GraphflowVisitor();
        return (StructuredQuery) visitor.visit(tree);
    } catch (Exception e) {
        throw new ParseCancellationException(e.getMessage());
    }
}