i3psh5B8

1#include "mail_addr_validator.hpp"
2#include <ctype.h>
3
4QString suffix = "@gmail.com";
5
6bool is_mail_valid(QString mail) {
7    // remove unnessessary spaces
8    mail.replace(' ', "");
9    mail.replace('\t', "");
10    mail = mail.toLower(); // make the address case-insesitive
11
12    if (!mail.endsWith(suffix)) return false;
13
14    // remove dots from the address (since GMail ignores them)
15    mail.replace('.', "");
16    suffix.replace('.', "");
17
18    // now only the prefix will be checked
19    auto size = mail.size() - suffix.size();
20    if (size == 0) return false;
21
22    // return false if the first and the last character of the prefix is not a letter or a digit
23    if (!mail[0].isLetterOrNumber() || !mail[size - 1].isLetterOrNumber()) return false;
24
25    auto contains_letters = false;
26    QChar prev = ' ';
27
28    for (auto i = 0; i < size; ++i) {
29        auto c = mail[i];
30
31        if (c.isLetter()) {
32            contains_letters = true;
33        } else if (!c.isDigit()){
34            if (c != '_' && c != '-') return false;
35
36            if (c == prev && !c.isDigit()) return false;
37        }
38
39        prev = c;
40    }
41
42    if (!contains_letters) return false;
43
44    return true;
45}