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

[tdknghi <nk.truong at student.qut.edu.au>]

   Hi,
Many thanks for your quick and detail response. However, I tried it and 
it doesn't work. It all compiled but when I run
  java Main -showtree myprogram.java

the ASTFrame view doesn't appear at all. Do we have to modify the 
lexer or parser?????

Thanks.

Regards,
MiMi

--- In antlr-interest at yahoogroups.com, "Morne Streicher" 
<mornes at m...> wrote:
> 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 s...>
> [mailto:nk.truong at s...]
> 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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