DSL for file processing - GetInLine

I've been playing with an embedded Domain-specific language for file processing. It grew out of a requirement from my current project, but I've already found a use for it in a couple of personal tasks.

Tha language is growing and changing fast, but here's a code snippet that may give you a feel for what it can do already:

public void testIncludingFiltersOutRecordsThatDoNotMatchACondition() throws Exception {
 new Source().
 fromFile("docs/sample-data/flights3.txt").
 upToTheEnd().
 counting(allRecords).
 withoutBlankLines().
 counting(nonBlankRecords).
 allowing(Processing.rule().
  accepting(1).
  including(terminalRecordPattern).
  populatingList(
  terminals,
  terminalFactory,
  regexParser),
   Processing.rule().
  including(detailRecordPattern).
  populatingList(
   flights,
   flightFactory,
   commaDelimitedParser))
  .read();
  
 assertEquals(1, terminals.size());
 assertEquals(4, flights.size());
 assertEquals(6, allRecords.getCount());
 assertEquals(5, nonBlankRecords.getCount());
 checkEntry(0, "BA123", "Glasgow", "09:45");
 checkEntry(2, "BM435", "Bradford", "10:40");
}

which will read this file and create objects from it:

Terminal 1

BA123,Glasgow,09:45
IB236,Barcelona,10:20
BM435,Bradford,10:40
KL326,Amsterdam (Schipol),11:00