So for a school assignment I'm supposed to make a basic text editor using a doubly linked list, I have pretty much written most of it but keep coming across several problems. In certain places,all marked in the code, I get the error "expected a declaration" ive looked online and nothing ive found helps. And secondly I also get the error" declaration has no storage class or type specifier" but i havent been able to find anything that helps either. If anyone could help me fix these id greatly appreciate it
Code:
// assignment 2-2.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <iostream>
#include <fstream>
#include <assert.h>
#include <string>
#include <windows.h>
#include <list>
using namespace std;
template <class Node_entry>
struct Node {
// data members
Node_entry entry;
Node<Node_entry> *next;
Node<Node_entry> *back;
// constructors
Node( );
Node(Node_entry, Node<Node_entry> *link_back = NULL,
Node<Node_entry> *link_next = NULL);
};
template <class List_entry>
class List {
public:
// methods of the List ADT
List( );
int size( ) const;
bool full( ) const;
bool empty( ) const;
void clear( );
error_code traverse(void (*visit)(List_entry &));
error_code retrieve(int position, List_entry &x) const;
error_code remove(int position, List_entry &x);
error_code insert(int position, const List_entry &x);
protected:
// data members for a contiguous list implementation
int count=0;
List_entry entry[max_list];
mutable int current_position;
mutable Node<List_entry> *current;
void set_position(int position) const;
}
template <class List_entry>
int List<List_entry>::size( ) const
{
return count;
}
template <class List_entry>
void List<List entry>::set_position(int position) const
{
if (current position <= position)
for ( ; current position != position; current position++)
current = current->next;
else
for ( ; current position != position; current position−−)
current = current->back;
}
template <class List_entry>
error_code List<List_entry>::insert(int position, const List entry &x)
{
Node<List_entry> *new_node, *following, *preceding;
if (position < 0 || position > count) return range_error;
if (position == 0) {
if (count == 0) following = NULL;
else {
set_position(0);
following = current;
}
preceding = NULL;
}
else {
set_position(position − 1);
preceding = current;
following = preceding->next;
}
new_node = new Node<List_entry>(x, preceding, following);
if (new_node == NULL)
return overflow;
if (preceding != NULL)
preceding->next = new_node;
if(following != NULL) following->back = new_node;
current=new_node;
current_position=position;//<-----error declaration has no storage class same for next 2
count++;//<----error
return success;//<-----error
}
int main(int argc, char *argv[ ])
{
if (argc != 3) {
cout << "Usage:\n\t edit inputfile outputfile" << endl;
exit (1);
}
ifstream file_in(argv[1]); // Declare and open the input stream.
if (file_in == 0) {//<<----error Expected a Declartion
cout << "Cant open input file " << argv[1] << endl;
exit (1);
}
ofstream file_out(argv[2]); // Declare and open the output stream.
if (file_out == 0) {//<--same as above
cout << "Cant open output file " << argv[2] << endl;
exit (1);
}
Editor buffer( &file in, &file out);
while (buffer.get_command())//<<----error Expected a Declartion
buffer.run_command();
}
class Editor: public List<String> {
public:
Editor(ifstream *file_in, ofstream *file_out);
bool get_command( );
void run_command( );
private:
ifstream *infile;
ofstream *outfile;
char user_command;
// auxiliary functions
error_code next_line( );
error_code previous_line( );
error_code goto_line( );
error_code insert_line( );
error_code substitute_line( );
error_code change_line( );
void read_file( );
void write_file( );
void find_string( );
}//<<----error Expected a Declartion
Editor::Editor(ifstream *file in, ofstream *file out)
{
infile = file in;
outfile = file out;
}
bool Editor:: get_command( )
{
if (current != NULL)
cout << current_position << " : "<< current->entry.c str( ) << "\n??" << flush;
else
cout << "File is empty.\n??" << flush;
cin >> user_command; // ignores white space and gets command
user_command = tolower(user_command);//<-- error "user_command has no storage class
while(cin.get( ) != '\n')//<<----error Expected a Declartion
; // ignore users enter key
if(user_command == 'q')//<<----error Expected a Declartion
return false;
else//<<----error Expected a Declartion
return true;
}
template <class List_entry>
void Editor::run_command( )
{
string temp_string;
cout << "Press h or ? for help or enter a valid command: ";
if(user_command=='b'){
if (empty( ))
cout << " Warning: empty buffer " << endl;
else
while (previous_line( ) == success);
goto point;;}
if(user_command=='c'){
if (empty( ))
cout << " Warning: Empty file" << endl;
else if (change_line( ) != success)
cout << " Error: Substitution failed " << endl;
goto point;;}
if(user_command=='d'){
if (remove(current_position, temp_string) != success)
cout << " Error: Deletion failed " << endl;
goto point;;}
if(user_command=='e'){
if(empty())
cout<<"Warning: Buffer is empty"<<endl
else
while (next_line( ) == success)
;
goto point;}
if(user_command=='f'){
if (empty( )) cout << " Warning: Empty file" << endl;
else
find_string( );
goto point;}//<<----error Expected a Declartion
if(user_command=='g'){
if (goto_line( ) != success)
cout << " Warning: No such line" << endl;
goto point;;}
if(user_command=='?'||user_command=="h"){
cout << "Valid commands are: b(egin) c(hange) d(el) e(nd)"
<< endl
<< "f(ind) g(o) h(elp) i(nsert) l(ength) n(ext) p(rior) " << endl
<< "q(uit) r(ead) s(ubstitute) v(iew) w(rite) " << endl;}
if(user_command=='i'){
if (insert_line( ) != success)
cout << " Error: Insertion failed " << endl;
goto point;;}
if(user_command=='l'){
cout << "There are " << size( ) << " lines in the file." << endl;
if (!empty( ))
cout << "Current line length is "<< strlen((current->entry).c_str( )) << endl;
goto point;;}
if(user_command=='n'){
if (next_line( ) != success)
cout << " Warning: at end of buffer" << endl;
goto point;;}
if(user_command=='p'){
if (previous_line( ) != success)
cout << " Warning: at start of buffer" << endl;
goto point;;}
if(user_command=='r'){
read_file( );
goto point;;}
if(user_command=='s'){
if (substitute_line( ) != success)
cout << " Error: Substitution failed " << endl;
goto point;;}
if(user_command=='v'){
traverse(write);
goto point;;}
if(user_command=='w'){
if (empty( ))
cout << " Warning: Empty file" << endl;
else
write_file( );
goto point;;}
point:
}
void Editor : : read file( )
{
bool proceed = true;
if (!empty( )) {
cout << "Buffer is not empty; the read will destroy it." << endl;
cout << " OK to proceed? " << endl;
if (proceed = user says yes( )) clear( );
}
int line_number = 0, terminal_char;
while (proceed) {
String in_string = read_in(*infile, terminal_char);
if (terminal char == EOF) {
proceed = false;
if (strlen(in_string.c_str( )) > 0) insert(line_number, in_string);
}
else insert(line_number++, in_string);
}
}
Error code Editor : : insert line( ){
int line number;
cout << " Insert what line number? " << flush;
cin >> line_number;
while (cin.get( ) != 'n');
cout << " What is the new line to insert? " << flush;
String to insert = read in(cin);
return insert(line number, to insert);
}