[antlr-interest] analysing java source code

[Jim O'Connor]

 Hi Suma,
  I assume you can "Tool" a grammar using antlr.  I assume you understand
the role of the Main.java file in "running" the grammar.   If you don't
understand either of those, I would recommend going to the getting started
section of antlr.org.
  The printing of the variables and types for a java file should be half
hour exercise (being generous), assuming you already have java.g,
java.tree.g, and Main.java cranked up.

Steps
1. Tool java.g
2. Tool java.tree.g
3.  compile all the *.java files, including Main.java.
4.  Execute Main.java given an input file.
         I don't think it will output anything - no actions!
5.  To get your types and variables look at java.tree.g

variableDef
	:	#(VARIABLE_DEF modifiers typeSpec variableDeclarator
varInitializer)
	;

variableDeclarator
	:	IDENT
	|	LBRACK variableDeclarator
	;

This section of the world should be very interesting to you.  Rip off some
print methods from other grammars and you're set.


The obfuscator, minimally,  is a translator that wants to make everything
less readable, rather than more.  I haven't looked for translators, but
there are people here that have opinions/expertise on those.

I am working on the Java Cross Referencing Tool.  The obfuscator would want
to know this type of information to make consistant changes. 

Hope that helps.

Jim

  

-----Original Message-----
From: Suma Venkatesh
To: antlr-interest at yahoogroups.com
Sent: 10/1/03 6:14 PM
Subject: Re: [antlr-interest] analysing java source code

Hi
  Terence,

 I did look into that already but can you please give me some tips on
how to run it and
use it to achieve my task.I mean read a java file parse it and print
variables and their
types.some small sample will do for me.I need to start from here and
later learn to
analyse entire java code like control constructs etc.Our main idea is to
build an
obfuscation tool kit for java programs using antlr.


thanks in advance,
suma


--- Terence Parr <parrt at antlr.org> wrote:
> See the cross referencing headstart in the file sharing area.
> 
> Terence
> On Wednesday, October 1, 2003, at 10:01 AM, Suma Venkatesh wrote:
> 
> > Hi,
> >
> >   Iam looking for  parsing which can parse an input java source
code.I 
> > mean the parser
> > should read the source code and identify the variable names and
types 
> > and control
> > structures.I saw java.g example of antlr.But can anyone help me on
how 
> > to use that for
> > getting specific results like below.ALso it should the read from an 
> > input file ,parse it
> > and write the output in a file.
> >
> > Eg: Input is :
> >   import java.util.*;
> >
> > public class HelloWorld{
> >
> > public static void main(String args[]) {
> >
> > String message = "Hello World";
> > int count =0;
> >
> > 	while(count <10) {
> >              System.out.println(message);
> >              count++;
> >         }
> >
> > }
> >
> > Output should be :
> >
> > Variables: type name
> >            int  count
> >            String message
> >
> > Can ANTLR do this and if so how ??
> >
> > PLEASE HELP ME!!
> >
> > thanks in advance,
> > suma
> >
> >
> >
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