You are given a copy of lex.h from Programming Assignment 1, and a file called tokensListing.cpp as a driver program.

DO NOT CHANGE neither lex.h nor tokensListing.cpp.

Your implementation should include the following in another file, called RA5.cpp: The function LexItem id_or_kw(const string& lexeme, int linenum); id_or_kw () function accepts a reference to a string of a lexeme and a line number and returns a LexItem object. It searches for the lexeme in a directory that maps a string value of a keyword to its corresponding Token value, and it returns a LexItem object containing the keyword Token if it is found. Otherwise, it returns a LexItem object containing a token for one of the possible types of identifiers (i.e., IDENT, SIDENT, or NIDENT). The overloaded operator function operator<< for LexItem. ostream& operator<<(ostream& out, const LexItem& tok); The operator<<() function accepts a reference to an ostream object and a reference to a LexItem object, and returns a reference to the ostream object. The operator<< function prints out a LexItem object information according to the Token value using the following formats: Token Format IDENT IDENTIFIER: at Line NIDENT/SIDENT : at Line Keyword token : at Line ICONST/RCONST : () at Line SCONST SCONST: at Line Operators : at Line ERR ERROR: at Line

Note that the implementation of operator<< function in RA5 differs from its implementation in PA1. See the examples in the class slides for the output format. Use the given driver program in tokensListing.cpp for testing your implementations. The driver program accepts a file name for a test case in each run, and there are 5 test cases used. See the details of the outputs for the examples in the slides.