100 lines
3.0 KiB
C++
100 lines
3.0 KiB
C++
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#include "Console.h"
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#include <boost/optional.hpp>
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#include <boost/algorithm/string/trim.hpp>
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using std::string;
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using std::vector;
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using std::ostream;
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using std::istream;
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using std::flush;
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using std::getline;
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using boost::optional;
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using boost::none;
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using std::function;
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using namespace cpputils;
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IOStreamConsole::IOStreamConsole(): IOStreamConsole(std::cout, std::cin) {
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}
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IOStreamConsole::IOStreamConsole(ostream &output, istream &input): _output(output), _input(input) {
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}
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optional<int> parseInt(const string &str) {
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try {
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string trimmed = str;
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boost::algorithm::trim(trimmed);
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int parsed = std::stoi(str);
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if (std::to_string(parsed) != trimmed) {
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return none;
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}
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return parsed;
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} catch (const std::invalid_argument &e) {
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return none;
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} catch (const std::out_of_range &e) {
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return none;
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}
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}
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function<optional<unsigned int>(const std::string &input)> parseUIntWithMinMax(unsigned int min, unsigned int max) {
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return [min, max] (const string &input) {
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optional<int> parsed = parseInt(input);
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if (parsed == none) {
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return optional<unsigned int>(none);
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}
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unsigned int value = static_cast<unsigned int>(*parsed);
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if (value < min || value > max) {
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return optional<unsigned int>(none);
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}
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return optional<unsigned int>(value);
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};
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}
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template<typename Return>
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Return IOStreamConsole::_askForChoice(const string &question, function<optional<Return> (const string&)> parse) {
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optional<Return> choice = none;
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do {
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_output << question << flush;
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string choiceStr;
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getline(_input, choiceStr);
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choice = parse(choiceStr);
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} while(choice == none);
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return *choice;
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}
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unsigned int IOStreamConsole::ask(const string &question, const vector<string> &options) {
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if(options.size() == 0) {
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throw std::invalid_argument("options should have at least one entry");
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}
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_output << "\n" << question << "\n";
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for (unsigned int i = 0; i < options.size(); ++i) {
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_output << " [" << (i+1) << "] " << options[i] << "\n";
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}
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int choice = _askForChoice("Your choice [1-" + std::to_string(options.size()) + "]: ", parseUIntWithMinMax(1, options.size()));
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return choice-1;
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}
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function<optional<bool>(const string &input)> parseYesNo() {
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return [] (const string &input) {
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string trimmed = input;
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boost::algorithm::trim(trimmed);
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if(trimmed == "Y" || trimmed == "y" || trimmed == "Yes" || trimmed == "yes") {
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return optional<bool>(true);
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} else if (trimmed == "N" || trimmed == "n" || trimmed == "No" || trimmed == "no") {
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return optional<bool>(false);
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} else {
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return optional<bool>(none);
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}
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};
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}
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bool IOStreamConsole::askYesNo(const string &question) {
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_output << "\n" << question << "\n";
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return _askForChoice("Your choice [y/n]: ", parseYesNo());
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}
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void IOStreamConsole::print(const std::string &output) {
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_output << output << std::flush;
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}
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