JavaCC Grammar

http://www.engr.mun.ca/~theo/JavaCC-Tutorial/javacc-tutorial.pdf

http://www.javaworld.com/javaworld/jw-12-1996/jw-12-jack.html
http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-cooltools.html

Thanks for the link objects. But how do I write the following grammer?

Start         ::= 'begin' StatementList 'end'

Is it a java code like this.

class Start() {

begin..

I am confused on what actually I need to write. Please help.

Thanks,
Mohammed

This is now the new home for Javacc: https://javacc.dev.java.net/
From there you can download the utility as well as read their documents (which are pretty good).
see:
https://javacc.dev.java.net/doc/javaccgrm.html
Also the zip file contains examples which are easy to follow.

>> What exactly does writing a grammar means?
It means that you define a language that describe both set of keywords(syntax) and their relation.
I find myself using JavaCC anytime I need to deal with complex syntax(input) which can not be parsed
by using String/StreamTokenizer or RegExp.

If you give more details about the syntax you need I can help writing down the (javacc) .jj file.
Basically I need you to define your syntax (using BNF is a great way for doing it) and the action[s]/return type that you need (assuming
you don't want only to validate the input but also want to get some info from it).

>> Start         ::= 'begin' StatementList 'end'
I get that 'begin' and 'end' are keywords, but what is StatementList?
Also, is there something you need returned from the evaluation or is just valid/invalid syntax?

>>Is it a java code like this.
>> class Start() {
Its a mix of both JavaCode and JavaCC grammer definitions.

Thanks aozarov. Following is the thing that I am working on which I need help in.

1.      Use javacc to write a parser for the following grammar:

Start         ::= 'begin' StatementList 'end'
StatementList ::= Statement { Statement }
Statement     ::= 'id' '=' Expr ';'
Expr          ::= Term { ( '+' | '-' ) Term }
Term          ::= Factor { ( '*' | '/' ) Factor }
Factor        ::= 'id' | 'integer' | '(' Expr ')'

Any help is greatly appreciated.

Thanks,
Mohammed

Just to verify.
1. is it homework?
2. should the parser return true/false for validating the input?

1) Yes this is an assignment for my class that I need help on.
2) The thing that I am having problem is in understanding how to write a parser. My professor hasn't explained much about this assignment and this is the first time I am trying to write a parser in javacc.

Thanks,
Mohammed

> 1. is it homework?

same rules actually apply whether its homework or not, talk to the page editor if you need more details.

Thanks aozarov. This helps a lot. Thanks again for your quick help. I really appreciate it.

Thanks,
Mohammed

NP. :-)