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 $"$RA$5.$cpp$"$:

The function $($from PA $1)$

Lexltem id$\_$or$\_$kw$($const string& lexeme, int linenum$)$;

Id$\_$or$\_$kw function accepts a reference to a string of identifier lexeme $($i$.$e$.,$ keyword, or IDENT$)$ and a line number and returns a Lexltem 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 Lexltem object containing the lexeme,

the keyword Token, and the line number, if it is found, or IDENT Token otherwise.

The overloaded operator function operator $$ for printing out an object of Lexltem class $($defined in "lex.h$").$

ostream& operator $<mtext\; id="EditorElement\_2702969"></mtext><mi\; id="EditorElement\_2702970">(</mi>$ostream& out, const Lexltem& tok$)$;

The operator $<mtext\; id="EditorElement\_2703020"></mtext><mi\; id="EditorElement\_2703021">(</mi><mi\; id="EditorElement\_2703022">)</mi>$ function accepts a reference to an ostream object and a reference to a Lexltem object, and returns a reference to the ostream object. The

operator$$ function prints out a Lexltem object information according to the Token value using the following formats:

Token

Format

IDENT

IDENT: 'lexeme'

Keyword token

Keyword$-$Token: Keyword

ICONST$/$ RCONST

Token: $($lexeme$)$

SCONST

SCONST: "lexeme"

Operators

Op$-$Token: Operator Symbol "lexeme"

delimiters

Delimiter$-$Token: Delimiter Character "lexeme"

ERR

ERR: $\{$lexeme$\}$ Error at Line no$.$ linenumber

Where, "linenumber" is the value of the line number, "lexeme" is the lexeme string value.

Note that the implementation of operator$$ function in RA$5$ differs from its implementation in PA $1.$ See the examples in the class slides for the output

format.

Use the given driver program in "tokensListing.cpp$"$ for testing your implementations, where the driver program would accept a file name as a command line

argument for a test case in each run. Note, there are $4$ test cases in RA $5.$ See the details of the outputs for the examples in the slides.