Readibility of Source of Csq4

[AniketKumar2500]

I was looking at Csq4's parser after 5 days so i found there are confusing parts in it so to improve it i am thinking to make parser and lexer from the starting which will let newcomers understand the code easily. But remember there will not be any change in syntax it will remain same.
The parser is full of code which is not easy to manage and it also lacks some part of error handling becuase in the initial stage there weren't any problems for it so this rewritting will help in error handling also.