[x]
Posted via EE Mobile

Search, ask, and monitor your questions on the go with EE Mobile. Visit Experts Exchange from your mobile device and never be out of touch again.

Question
[x]
Attachment Details
[x]
The Solution Rating System

With so many solutions, how can you tell which solutions are most likely to help you and which ones are not? To provide you with a tool to use, we rate our solutions based on various elements that most accurately determine if a solution is a quality solution. To explain what factors affect the solution rating, here are the elements we take into consideration when formulating our solution rating.

  • The Grade of the Solution
  • The Zone Rank of the Expert Providing the Solution
  • The Number of Author and Expert Comments
  • The Number of Experts Contributing
  • The Feedback of the Community

Your Input Matters
Because of the way the system is set up, the most important variable in this equation is you. As a member of Experts Exchange, you are able to cast your vote on the quality of the solutions in regard to how complete, accurate, helpful and easy to understand each solution is. When you provide your feedback, each rating is adjusted accordingly. So, if you see a solution that has a poor rating that you think is a good solution, let us know by rating it. As you do, the rating will be adjusted and will become more accurate for other members of our site.

If you have any suggestions that you would like to make for our rating system, please ask a question in the Suggestions Zone of Community Support.

Thank you!

8.0

antlr parsing advice

Asked by D4Ly in Java Programming Language

Tags: grammar, lbracket

I've got the following portion of a parsing grammar (for ANTLR)

type: ("int" | "bool" | "void" | ID)(ARRAY)?
;

expr: (uop expr
      | INTEGER
      | LPAREN expr RPAREN
      | lvalue
      | "new" (ID LPAREN (actuals)? RPAREN | type LBRACKET expr DOTS expr RBRACKET) <--- (1)
      ) (op expr)* <--- (2)
;

op: AND
      | OR
      | EQ
      | NEQ
      | LSE
      | GTE
      | LS
      | GT
      | PLUS
      | MINUS
      | MULT
      | DIV
;

I'm having a bit of trouble removing the nondeterminism issues on the lines marked with <---. Below are my observations:

For (1)
When removing the 'type' class from (1) the nondeterminism goes away. This is because both sides of the OR pattern in (1) can begin with ID (the left side always beginning with ID, whereas 'type' on the right side can also match ID as the beginning of its pattern. I am not sure how to remedy this. I can't just remove ID from the 'type' class since it's referenced elswhere.

For (2)
I find that when removing the * from (2) the nondeterminism for that line is removed, though I can make the connection to what is causing the issue.

This IS part of a homework assignment. I am NOT looking for answers, but advice or suggestions. Thanks!!
[+][-]02/18/06 08:54 AM, ID: 15989122Expert Comment

At Experts Exchange, members can ask their questions to thousands of technology professionals, also known as Experts. Experts compete and collaborate to answer those questions by leaving comments like this one.

Start your 30-day free trial to view this Expert Comment or ask the Experts your question.

 
[+][-]02/18/06 09:11 AM, ID: 15989197Author Comment

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 30-day free trial to view this Author Comment or ask the Experts your question.

 
[+][-]02/18/06 09:24 AM, ID: 15989292Expert Comment

At Experts Exchange, members can ask their questions to thousands of technology professionals, also known as Experts. Experts compete and collaborate to answer those questions by leaving comments like this one.

Start your 30-day free trial to view this Expert Comment or ask the Experts your question.

 
[+][-]02/18/06 09:32 AM, ID: 15989346Accepted Solution

View this solution now by starting your 30-day free trial. Setting up your free trial is quick, easy, and secure. We will return you to this solution, unlocked, when you're done.

About this solution

Zone: Java Programming Language
Tags: grammar, lbracket
Sign Up Now!
Solution Provided By: Webstorm
Participating Experts: 1
Solution Grade: B
 
[+][-]02/18/06 10:22 AM, ID: 15989688Author Comment

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 30-day free trial to view this Author Comment or ask the Experts your question.

 
[+][-]02/18/06 10:24 AM, ID: 15989701Author Comment

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 30-day free trial to view this Author Comment or ask the Experts your question.

 
[+][-]02/18/06 02:15 PM, ID: 15990899Author Comment

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 30-day free trial to view this Author Comment or ask the Experts your question.

 
[+][-]02/19/06 04:04 PM, ID: 15996872Author Comment

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 30-day free trial to view this Author Comment or ask the Experts your question.

 
 
Loading Advertisement...
20091021-EE-VQP-81