Lexer (/PyCOOLC/lexer.py) was implemented. Some of the missing tokens are:

• (* and *): for matching multi-lines comments.
• --: for matching single lines comments.

More missing tokens: loop, pool, Int, String, Object, SELF_TYPE, let, in, ~, <-.

Implemented all the missing tokens reported in previous comments. The Lexer is ready.

Parser fails at parsing TYPEs in the source code. A Type is any user defined Class or builtin Class in COOL.

The regular expression for ID Token Rule should be modified to consider only Identifiers with a leading lowercase alphabetical letter or an underscore (_) to be an ID Token and all other identifiers that start with a leading uppercase alphabetical character to be a Type. The checks for IDs and TYPEs should also be secondary to checks against the reserved keywords map.

TYPE Rule was added to the Lexer as a complex lexing token rule and as a Token Type.