[antlr-interest] line number counter reset

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

Hi all,

I would like tracking the line number in my program when parse Java 
program. I wrote a class to extend antlr.CommonAST then instruct the 
parser to use my custom AST type rather than the default AST node 
type. I have everything work beautifully except one problem. I 
attach all the files together with the description so that you could 
get a better idea of what goes wrong.

  ---------------------------------

 1. Here is my custom AST node type:

public class LineAST extends antlr.CommonAST 
{
	int line_number = 0;
	int column_number = -1;
	private static boolean verboseStringConversion = false;
	private static String[] tokenNames = null;

	public LineAST() 
	{
	}

	public LineAST(antlr.Token tok) 
	{
		initialize(tok);
	}

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

	public int getLine()
	{
		return line_number;
	}

	public int getColumn()
	{
		return column_number;
	}
	public static void setVerboseStringConversion(boolean 
verbose, String[] names) 
	{
		verboseStringConversion = verbose;
		tokenNames = names;
	}

	public String toString()
	{
		StringBuffer b = new StringBuffer();

		// if verbose and type name not same as text 
(keyword probably)
		if (verboseStringConversion &&
			!getText().equalsIgnoreCase(tokenNames
[getType()])) 
		{
			b.append("[l# " + getLine() + " c# " + 
getColumn() + " ");
			b.append(getText());
			b.append(",<");
			b.append(tokenNames[getType()]);
			b.append(">]");
			return b.toString();
		}
		return getText();

	}
}
  -----------------------------------------
2. Instruct the parser to use my custom AST node..(it's done 
correctly).

--------------------------------------------------
3. When a parser the following program --- PROBLEM START HERE!!!!!!

1     import TerminalIO.*;
2
3     public class Minutes 
4     {
5	ScreenWriter writer = new ScreenWriter(); ****
6
7	public void run() 
8	{
9		int i = 5;		***
10		System.out.println(i);		
11	}	
12	
13	public static void main(String[] args)
14	{
15		System.out.println("main method");
16	}
17     }

 a. The line number of the "ScreenWriter token" (type one) suddently 
reset to 0 (the correct line number should be 5), but the line 
number of the token "writer" is correct which is 5. The rest of 
tokens in that line is correct.
 b. Similarity  with the line int i = 5; the line number of the 
token "int" is reset to 0 but the line number of toke "i", "=", "5" 
is correct.

 I have done several tests. the line number only reset for the first 
token of the variable declaration line only. 

Do you have any idea what goes wrong? Many thanks for all your help.


Regards,
MM

Note: I am using ANTLR 2.7.2



 

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