[antlr-interest] Re: Line number [sls]-bl.spamcop.net

[Morne Streicher]

Dear All

Thanks to some help from this interest group, I found it easy to track line numbers. Here is what I have done. Hope this concrete example helps - and off course, it's only one way of doing it... 

Sure there are more elegant ways - but this works for me...

Step 1 : Extend the CommonAST class:
----------------------------------------------------------



public class OTS_AST extends CommonAST {
	int line_number = -1;
	int column_number = -1;
	
    public OTS_AST() {
    }

    public OTS_AST(Token tok) {
        initialize(tok);
    }

    public void initialize(Token tok) {
        setText(tok.getText());
        setType(tok.getType());
		this.line_number = tok.getLine();
		this.column_number = tok.getColumn();		
    }
	
	public int getLine()
	{
		return this.line_number;
	}
	
	public int getColumn()
	{
		return this.column_number;
	}
}

Step 2 : Tell the parser which AST class to use:
---------------------------------------------------
			//....
			otsLexer lexer = new otsLexer(fis);
			lexer.setFilename(filename);
			otsParser parser = new otsParser(lexer);
			parser.setFilename(filename);
			parser.setASTNodeType("OTS_AST");  --NB!!!!!!!!
			parser.otscript();
			//....

Step 3: Get your instance of the AST
----------------------------------------

		//.....

		OTS_AST ast = (OTS_AST) parser.getAST()

		int token1_line = ast.getLine();

		//...

And that's it. 

M.

-----Original Message-----
From: tdknghi <nk.truong at student.qut.edu.au>
[mailto:nk.truong at student.qut.edu.au]
Sent: 12 February 2003 07:58
To: antlr-interest at yahoogroups.com
Subject: [antlr-interest] Re: Line number [sls]-bl.spamcop.net
Importance: Low


    Hi,

Sorry for being so stupid. Could you give me more detail instruction 
how to keep track the line number for Java programs (by AST view)?
I read the track line number section in the ANTLR documentation. 
However, I haven't got a clear idea how to do it. 

Thanks.

Regards,
MiMi


--- In antlr-interest at yahoogroups.com, "micheal_jor <open.zone at v...>" 
<open.zone at v...> wrote:
> 
> >   Hi all,
> > 
> > I have seen a lot of post regarding about display the line number 
> in the 
> > AST vew. However, there is no clear and example of how to do it. I 
> am 
> > currently using antlr 2-7.2.
> >    Could you please let me know how to get it done. Thanks.
> > 
> > Regards,
> > MiMi
> 
> If you are using Java or C# and, if by "AST view" you mean the 
> ASTFrame mechanism for viewing your ASTs then you can do the 
> following:
> 
> 1. Create a subclass of the appropriate standard Common***AST 
class 
> (if you haven't already)
> 2. Override toString()/ToString() to print line numbers as well
> 3. Instruct your parser to use your new AST class with 
> parser.setASTNodeType(string) or by using the "ASTLableType" 
option 
> in your grammar.
> 
> Run your app as usual  ;-)
> 
> Micheal


 

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