[antlr-interest] charScanner panic.

[Bharath Sundararaman]

Hi all,

 

I have an application that passes code to my ANTLR compiler. Recently,
when the code is passed, the CharScanner's panic() method is called
which causes a system exit. I over-rode the panic() method and prevented
the system from exiting which led to "can't find AST node type:
packageName.ASTName" exception. 

 

public void setASTNodeClass(String t) {

        theASTNodeType = t;

        try {

            theASTNodeTypeClass = Class.forName(t); // get class def

        }

        catch (Exception e) {

            // either class not found,

            // class is interface/abstract, or

            // class or initializer is not accessible.

            error("Can't find/access AST Node type" + t);

        }

    }

 

This method indicates to me that it's a class loader issue related to
Eclipse IDE and the way it deals with plugins. Has anybody faced this
problem before while using antlr.jar with their Eclipse plug-in? I know
one solution is to add antlr.jar to your system class path so that
parent CL will find it before the Eclipse CL does but I don't want to
follow that approach, even if it will work.

 

Any ideas?

________________________________

From: antlr-interest-bounces at antlr.org
[mailto:antlr-interest-bounces at antlr.org] On Behalf Of Ed Delaney
Sent: Friday, April 29, 2005 8:51 AM
To: antlr-interest at antlr.org
Subject: [antlr-interest] PLSQLGrammar.g - antlr

 


Hey Michiel, 
Are you still working on your PL/Sql project? 

I finally got the PL/Sql grammar to generate and compile. I've created a
simple main to test it, but I'm not sure what is happening. Have you
made any more progress? 
Remember, my experience with Java is pretty basic, though I know a
zillion other languages. 

All I want to do is feed it some Plsql and see if it parses or if it
detects an error: 


import java.io.DataInputStream; 

class main { 
    public static void main(String[] args) { 
        try { 
            PLSqlLexer lexer = new PLSqlLexer(new
DataInputStream(System.in)); 
            PLSqlParser parser = new PLSqlParser(lexer); 
            parser.start_rule(); 
        } catch(Exception e) { 
            System.err.println("exception: "+e); 
        } 
    } 
} 

later on I want to generate an AST that I can start working with.  But
as it stands, shouldn't this work as a syntax checker? 

My test input is: 
BEGIN 
null; 
END; 

And when it runs I get 

java main < t.sql 
line 1:1: expecting EOF, found 'BEGIN' 


Thanks, 
Ed 



---------------------------------------------------
Ed Delaney
SunGard SCT
Advisory Software Engineer
Phone Number (Office): 765-939-0533
Time Zone: US Indiana
edelaney at sungardsct.com
www.sungardsct.com

Leadership - Choices - Excellence

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