Assignment 1: Completed

[siddham04]

1. Grammar Modifications:
   Added lexer tokens BYTE_SIZE and TIME_DURATION to the grammar (Directives.g4).

2.API Updates:
Created new Java classes ByteSize and TimeDuration extending Token, which handle parsing and conversion of byte size and time duration strings.

3.Core Parser Updates:
Implemented visitor methods (visitByteSizeArg and visitTimeDurationArg) to handle parsing of byte size and time duration values.

4.New Directive Implementation:
Created a new aggregate directive, aggregate-stats, which computes the sum or average of byte size and time duration columns.

5.Testing:
Added unit tests for ByteSize and TimeDuration classes to ensure correct parsing and value retrieval.

Checklist:

• Grammar changes (lexer and parser) for byte size and time duration.
• API updates for ByteSize and TimeDuration classes.
• New aggregate-stats directive implementation.
• Unit and parser tests for the new features.
• Successful build and test execution.