CIT597 Perl

CIT 597 Assignment 7: Perl
Fall 2006, David Matuszek

Purposes of this assignment:

Get you started using Perl
Give you plenty of practice with regular expressions

General idea of the assignment:

Translate an HTML page into XHTML.

Details:

Name your program xhtmlize.

Your program should accept any number of command-line arguments. It should check that each argument is the name of a file with a .htm or .html extension, and that the named file exists. It should also check that a file with the same name but an .xhtml extension does not already exist. For each acceptable file, the program should read the input file and silently produce the corresponding .xhtml file. If an input file cannot be processed for any reason (including errors during translation), the program should produce an appropriate error message for that file, but it should continue to process the remaining input files.

The output .xhtml file should begin with this DOCTYPE declaration:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

The remainder of the file should be enclosed in <html>...</html> tags.

Tags should be properly nested. To achieve this, you will need to keep a stack of start tags.

When you encounter a start tag, output it and push it onto the stack.
When you encounter an end tag,
- If it matches the top tag in the stack, output the end tag and pop the stack.
- Otherwise, search the stack to see whether it contains a corresponding start tag.
  - If it does, pop off each of the intervening start tags, and output an end tag for each.
  - If it doesn't, just discard the end tag.

All tags must be properly closed. There are a few tags you should recognize and close immediately: <br ...> becomes <br ... />, <hr ...> becomes <hr ... />, and <img ...> becomes <img ... />.

All tag names and all attribute names must be in lowercase.

Attribute values must be quoted.

Any start tag with a name attribute should have the id attribute added to it, with the same value.

In XHTML, attribute minimization is forbidden. However, you can ignore this requirement; I don't think I've ever seen attribute minimization in use.

Use regular expressions to do most of the work. Use functions to break up the work into manageable chunks.

Due date:

Monday, November 27 , before midnight. Submit your program via Blackboard..