Question

lex.h

-----------------

#ifndef LEX_H_

#define LEX_H_

#include <string>

#include <iostream>

using std::string;

using std::istream;

using std::ostream;

enum Token {

// keywords

PRINT, BEGIN, END, IF, THEN,

// an identifier

IDENT,

// an integer and string constant

ICONST, RCONST, SCONST,

// the operators, parens, semicolon

PLUS, MINUS, MULT, DIV, EQ, LPAREN, RPAREN, SCOMA, COMA,

// any error returns this token

ERR,

// when completed (EOF), return this token

DONE

};

class LexItem {

Token token;

string lexeme;

int lnum;

public:

LexItem() {

token = ERR;

lnum = -1;

}

LexItem(Token token, string lexeme, int line) {

this->token = token;

this->lexeme = lexeme;

this->lnum = line;

}

bool operator==(const Token token) const { return this->token == token; }

bool operator!=(const Token token) const { return this->token != token; }

Token GetToken() const { return token; }

string GetLexeme() const { return lexeme; }

int GetLinenum() const { return lnum; }

};

extern ostream& operator<<(ostream& out, const LexItem& tok);

extern LexItem getNextToken(istream& in, int& linenum);

#endif /* LEX_H_ */

---------------------/----

//tokenListing.cpp

include <iostream>

#include "lex.h"

#include "io.cpp"

#include <cctype>

#include <map>

using std::map;

using namespace std;

int

main()

{

LexItem toks[] = {

LexItem(PRINT,"PRINT",3),

LexItem(IF,"IF",3),

LexItem(BEGIN,"BEGIN",3),

LexItem(END,"END",3),

LexItem(IDENT,"area",3),

LexItem(ICONST,"579",3),

LexItem(SCONST,"hello NJIT",3),

LexItem(RCONST,"5.79",3),

LexItem(PLUS,"+",3),

LexItem(MINUS,"-",3),

LexItem(MULT,"*",3),

LexItem(DIV,"/",3),

LexItem(EQ,"=",3),

LexItem(LPAREN,"(",3),

LexItem(RPAREN,")",3),

LexItem(SCOMA,";",3),

LexItem(COMA,",",3),

LexItem(ERR, "ERR", 3),

LexItem(DONE,"DONE",3),

};

  

for( int i = 0; toks[i] != DONE; i++ )

cout << toks[i] << endl;

  

return 0;

}

---------------------------

You are given a copy of lex.h from Programming Assignment 2, and a file called tokensListing.cpp as a driver program. DO NOT CHANGE tokensListing.cpp Your implementation should include the following in another file, called io.cpp: Creating a static map container that defines the list of tokens and their associated string. The declaration is: static map <Token, string> tokenPrint = {........}; Writing code to implement the operator<< overloaded method for Lexltem. Use the given driver program in tokensListing.cpp for testing your implementation.

Answer 1

to Look code lex-app for reference it just a line of code if you want add it lez.h Let me know it you any problem thank you you can have & lex upp #include "lex.h" extern ostream v operator << (ostream yout, conch Tokstok) out L"token: 11 << tok. Get Token () 22" dex: <<tok Get dexeme() << CH dine no: " << tok. Getdenenum (); retum out) } lex.h #ifndef LEX-H- #define LEX_H #include <string> #include <iostream> using std:: sting; using Std :: istean; using std :: ostream; enum Token { ll Keywords PRINT, PRINTLN, REPEAT , BEGIMIEND,

1 an identifier IDENT, Han integen and string constant I CONST, SCONST, / Operalasparens, semicolon PLUS, MINOS , STAR, SLASH , EQUAREN , RPAREN, SC, ll any enor retums this token 2 ERR ll when completed (eof), retum this token DONE 3; Class Toks Token token; String lexeme; int Inum; public Tok() { token = ERR Inum = -1; Token (Token token, - token; string lezene, int line) & this - token this kezeme lexene; this Inum- line

bod operator (const Token token) const { retum this → token token; } bool operator! = (const Token token) const {retum this-> token! token; } Token Get Token () anst- pretuen to ken;} String Getderme ( ) const { retum lex eme;} int Gettinenum () const {retuen Inum; extern Ostream e-operator <e (ostream sout, const Tok Stok); extern Tok get- Next Token (istseam yin, int y line num); #endif /*LEX-H- */ Streams.PP #include "lex.hu int main ( & Tok toks (3= { TOK (BEGIN, TOK(PRINT , "PRINT", 3), Tok (PRINTIN, UPRINTIN", 2), Tok (REPEAT, CREPEAT", 3), BEGIN",3) TOK (END "END", 3), Tok (IDENT','foo', 3), Tok (CONST 4 347", 3), Tok (SCONST, "hello world", 3),

Tok (PLUS," +"), Tok (MINUS ,-"), Tok(STAR , " * 1,3), Tok ( SLASH,"/"), TOK (EQ , "=1,3), Tok (LPAREN, "(", 3), Tok (RPAREN.) 3), Tok (sc," : 1, 3) Tok (DONE , "DONE", 3). 3; for (int i = 0; toks [i]) = DONE; i++) cout << toks li] << endl; retum og 3

OUTPUT:

X CA Microsoft Visual Studio Debug Console Token: 0 Lex: PRINT LineNo: 3 Token: 1 Lex: PRINTLN LineNo: 3 Token: 2 Lex: REPEAT LineNo: 3 Token: 3 Lex: BEGIN LineNo: 3 Token: 4 Lex: END LineNo: 3 Token: 5 Lex: foo LineNo: 3 Token: 6 Lex: 347 LineNo: 3 Token: 7 Lex: hello world LineNo: 3 Token: 8 Lex: + LineNo: 3 Token: 9 Lex: - LineNo: 3 Token: 10 Lex: * LineNo: 3 Token: 11 Lex: / LineNo: 3 Token: 12 Lex: = LineNo: 3 Token: 13 Lex: ( LineNo: 3 Token: 14 Lex: ) LineNo: 3 Token: 15 LineNo: 3 Lex: ; C:\Users\ASUS FX505 \source\repos\ConsoleApplication5\Debug\ConsoleApplication5.exe (process 5336) exited with code 0. To automatically close the console when debugging stops, enable Tools->Options ->Debugging->Automatically close the conso le when debugging stops. Press any key to close this window ...