implementation of parsing the simple expressions with antlr

tests for parsing xor expression

tests for parsing complement expressions

tests for parsing divide expressions

tests for parsing equal expressions

tests for parsing greater than expressions

tests for parsing greater that or equal expressions

fixing the grammar for cast expressions (precedence)

tests for parsing instanceof expressions

tests for parsing instance expression

tests for left shift expressions

tests for right shift expressions

tests for parsing less than expressions

tests for parsing less than or equal expressions

tests for parsing modulo expressions

tests for parsing multiply expressions

tests for parsing negation expressions

fixing unary expressions! (?)

tests for parsing not equal expressions

tests for parsing not expression

tests for parsing or expressions

tests for parsing bitwise or expressions

tests for parsing subtract expression

tests for parsing unary plus expressison

tests for parsing xor expression