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#include <algorithm>
#include <fstream>
#include <iostream>
#include <string>
using namespace std;
#include <cctype>
// conversion to uppercase
class toUpper {public: char operator()(char c) const {return toupper(c);}};
bool isValidEmailCharacter(char c)
{
if ((c == '+') || (c == '-') || (c == '.') || (c >= '0' && c <= '9') ||
(c >= 'A' && c <= 'Z') || (c == '_') || (c >= 'a' && c <= 'z'))
return true;
else
return false;
}
int main()
{
// declare constants (default file names)
const string DEFAULT_INPUT_FILE = "fileContainingEmails.txt";
const string DEFAULT_OUTPUT_FILE = "copyPasteMyEmails.txt";
// declare array list
const int MAX_EMAILS = 1000;
int nEmails = 0;
string email[MAX_EMAILS];
// declare variables
string inputFileName;
string outputFileName;
ifstream fin; // file pointers
ofstream fout;
string line; // line from file
int s = 0, // start position of email
e = 0; // end position of email
bool hasDot = false; // check for period after @ symbol
string aEmail; // an email address!
bool emailAlreadyExists = false;
string email1, email2; // temporary strings, for converting emails to uppercase
string temp; // temporary string for sorting
// prompt user for input filename
cout << "Enter input filename [default: " << DEFAULT_INPUT_FILE << "]: ";
getline(cin, inputFileName);
if (inputFileName.length() == 0) {
inputFileName = DEFAULT_INPUT_FILE;
// prompt user for output filename
cout << "Enter output filename [default: " << DEFAULT_OUTPUT_FILE << "]: ";
getline(cin, outputFileName);
if (outputFileName.length() == 0) outputFileName = DEFAULT_OUTPUT_FILE;
} else {
// prompt user for output filename
cout << "Enter output filename [default: " << inputFileName << "]: ";
getline(cin, outputFileName);
if (outputFileName.length() == 0) outputFileName = inputFileName;
}
cout << endl;
cout << "Input file = " << inputFileName << endl;
cout << "Output file = " << outputFileName << endl;
cout << endl;
// open input file
fin.open(inputFileName.c_str());
if (!fin.good()) throw "I/O error";
while (fin.good())
{
getline(fin, line); // read a line
for (int i = 0; i < line.length(); i++) {
// look for '@' character
if (line[i] == '@') {
// Then look backwards in a loop until you find an invalid email address
// character, or run into the start of line.
s = i;
while (s > 0 && isValidEmailCharacter(line[s-1])) {
s--;
}
// Then look forwards from the same '@' in another loop until you find
// an invalid email address character, or run into the end of line.
e = i;
hasDot = false;
while (e < line.length() && isValidEmailCharacter(line[e+1])) {
if (line[e] == '.') hasDot = true;
e++;
}
// check for valid email
if (s < i && e > i && hasDot) {
aEmail = line.substr(s, e-s +1);
// check for duplicates
emailAlreadyExists = false;
email1 = aEmail;
transform(email1.begin(), email1.end(), email1.begin(), toUpper());
for (int i = 0; i < nEmails; i++) {
email2 = email[i];
transform(email2.begin(), email2.end(), email2.begin(), toUpper());
if (email1 == email2) emailAlreadyExists = true;
}
// if non-duplicate, add to list if there is space
if (!emailAlreadyExists && nEmails < MAX_EMAILS) {
email[nEmails++] = aEmail;
// print email address
cout << aEmail << endl;
}
}
}
}
}
cout << endl;
// close input file
fin.close();
// if one or more emails are found
if (nEmails > 0) {
// open output file
fout.open(outputFileName.c_str());
if (!fout.good()) throw "I/O error";
// write emails to file
for (int i = 0; i < nEmails; i++) {
fout << email[i];
if ((i+1) < nEmails) fout << "; ";
}
// close output file
fout.close();
cout << nEmails << " non-duplicate email " << ((nEmails==1) ? "address was" : "addresses were") << " found, and copied to the file " << outputFileName << endl;
} else {
cout << "Sorry, no email addresses were found in the file " << inputFileName << endl;
}
return 0;
}
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