PageRange class

Represents a page range for printing.

This class provides a type-safe way to define which pages of a document to print. It can represent a single page, a continuous range of pages, or a complex combination of pages and ranges.

Example usage:

// Print only page 5
final singlePage = PageRange.single(5);

// Print pages 2 through 7
final continuousRange = PageRange.range(2, 7);

// Print pages 1, 3-5, and 8
final complexRange = PageRange.multiple([
  PageRange.single(1),
  PageRange.range(3, 5),
  PageRange.single(8),
]);

// Parse from a string
final fromString = PageRange.parse("1-3,5,7-9");