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Easter calculator with HTML export (ProgTest HW3)
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| #ifndef __PROGTEST__ | |
| #include <cstdio> | |
| #include <cstdlib> | |
| #include <cctype> | |
| #include <cstring> | |
| #include <iostream> | |
| #include <iomanip> | |
| #include <fstream> | |
| #include <sstream> | |
| #include <vector> | |
| #include <string> | |
| #include <cstddef> | |
| #include <cassert> | |
| #define EASTER_OK 0 | |
| #define EASTER_INVALID_FILENAME 1 | |
| #define EASTER_INVALID_YEARS 2 | |
| #define EASTER_IO_ERROR 3 | |
| #endif | |
| struct Date { | |
| unsigned short Day; | |
| unsigned short Month; | |
| unsigned int Year; | |
| Date(unsigned short day, unsigned short month, unsigned int year) : Day(day), Month(month), Year(year) {}; | |
| }; | |
| const char *html_head = "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\">\n" | |
| "<html>\n<head>\n" | |
| "<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\">\n" | |
| "<title>C++</title>\n</head>\n<body>\n<table width=\"300\">\n" | |
| "<tr><th width=\"99\">den</th><th width=\"99\">mesic</th><th width=\"99\">rok</th></tr>\n"; | |
| const char *html_tail = "</table>\n</body>\n</html>"; | |
| bool export_html(std::vector<Date> &dates, const char * outFileName) { | |
| std::ofstream ofs(outFileName); | |
| if (!ofs.good()) | |
| return false; | |
| ofs << html_head; | |
| for (auto d : dates) | |
| ofs << "<tr><td>" << d.Day << "</td><td>" << (d.Month == 3 ? "brezen" : "duben") << "</td><td>" << d.Year << "</td></tr>" << std::endl; | |
| ofs << html_tail; | |
| return true; | |
| } | |
| Date get_easter_date(unsigned int year) { | |
| int a = year % 19; | |
| int b = year / 100; | |
| int c = year % 100; | |
| int d = b / 4; | |
| int e = b % 4; | |
| int f = (b + 8) / 25; | |
| int g = (b - f + 1) / 3; | |
| int h = (19 * a + b - d - g + 15) % 30; | |
| int i = c / 4; | |
| int k = c % 4; | |
| int L = (32 + 2 * e + 2 * i - h - k) % 7; | |
| int m = (a + 11 * h + 22 * L) / 451; | |
| int month = (h + L - 7 * m + 114) / 31; | |
| int day = ((h + L - 7 * m + 114) % 31) + 1; | |
| return Date(day, month, year); | |
| } | |
| bool try_stoi(const std::string &str, int &out) { | |
| std::string::size_type end; | |
| try { | |
| out = std::stoi(str, &end); | |
| if (end == str.size()) | |
| return true; | |
| else | |
| return false; | |
| } | |
| catch (...) { | |
| return false; | |
| } | |
| return true; | |
| } | |
| bool process_years(const std::string &str, std::vector<Date> &dates) { | |
| std::size_t pos = str.find('-'); | |
| if (pos != std::string::npos) { | |
| int start, end; | |
| if (!try_stoi(str.substr(0, pos), start)) | |
| return false; | |
| if (!try_stoi(str.substr(pos + 1, str.size()), end)) | |
| return false; | |
| if (start > end || start <= 1582 || start >= 2200 || end <= 1582 || end >= 2200) | |
| return false; | |
| for (int y = start; y <= end; y++) | |
| dates.push_back(get_easter_date(y)); | |
| } | |
| else { | |
| int year; | |
| if (!try_stoi(str, year) || year <= 1582 || year >= 2200) | |
| return false; | |
| dates.push_back(get_easter_date(year)); | |
| } | |
| return true; | |
| } | |
| int easterReport(const char * years, const char * outFileName) | |
| { | |
| std::string yrs(years); | |
| std::string filename(outFileName); | |
| for (auto & c : filename) c = toupper(c); //convert to uppercase | |
| if (filename.size() <= 5 || | |
| filename.compare(filename.size() - 5, 5, ".HTML") != 0 || | |
| filename.find_first_not_of("ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.\\/") != std::string::npos) | |
| return EASTER_INVALID_FILENAME; | |
| for (std::size_t i = 0; i < yrs.length(); i++) //remove the whitespaces | |
| if (yrs[i] == ' ') { | |
| yrs.erase(i, 1); | |
| i--; | |
| } | |
| if (yrs.size() < 4 || yrs.find_first_not_of("0123456789-,") != std::string::npos) | |
| return EASTER_INVALID_YEARS; | |
| std::vector<Date> dates; | |
| std::size_t start = 0; | |
| std::size_t end = yrs.find(','); | |
| while (end != std::string::npos) | |
| { | |
| if (!process_years(yrs.substr(start, end - start), dates)) | |
| return EASTER_INVALID_YEARS; | |
| start = end + 1; | |
| end = yrs.find(',', start); | |
| } | |
| //process the last year | |
| if (!process_years(yrs.substr(start, yrs.size()), dates)) | |
| return EASTER_INVALID_YEARS; | |
| if (!export_html(dates, outFileName)) | |
| return EASTER_IO_ERROR; | |
| return EASTER_OK; | |
| } | |
| #ifndef __PROGTEST__ | |
| int main(int argc, char * argv[]) | |
| { | |
| assert(easterReport("2012,2013,2015-2020,2020-2222", "out0.html") == EASTER_INVALID_YEARS); | |
| assert(easterReport("2000 - 2014", "out1.html") == EASTER_OK); | |
| assert(easterReport("2001 , 2002 , 2003 ,2005,2006", "out2.html") == EASTER_OK); | |
| assert(easterReport("2000,2011,2010-2020", "out3.html") == EASTER_OK); | |
| assert(easterReport("2000-3000", "out4.html") == EASTER_INVALID_YEARS); | |
| assert(easterReport("1002, 1554, 1984-1998, 1222", "out5.html") == EASTER_INVALID_YEARS); | |
| assert(easterReport(" 1300", "out6.htm") == EASTER_INVALID_FILENAME); | |
| assert(easterReport(" 1300", "out7.html") == EASTER_INVALID_YEARS); | |
| assert(easterReport("1200-1300", "out8.html") == EASTER_INVALID_YEARS); | |
| assert(easterReport(",1600", "out9.html") == EASTER_INVALID_YEARS); | |
| assert(easterReport("1600,", "out10.html") == EASTER_INVALID_YEARS); | |
| std::cout << "Tests succeeded!" << std::endl; | |
| return 0; | |
| } | |
| #endif |
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