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1 files changed, 72 insertions, 0 deletions
| -rw-r--r-- | Year 1/Object-oriented Programming/Project 2/src/Generic/ConsoleInterface/Menu.cpp | 72 |
diff --git a/Year 1/Object-oriented Programming/Project 2/src/Generic/ConsoleInterface/Menu.cpp b/Year 1/Object-oriented Programming/Project 2/src/Generic/ConsoleInterface/Menu.cpp new file mode 100644 index 0000000..9c2fca5 --- /dev/null +++ b/Year 1/Object-oriented Programming/Project 2/src/Generic/ConsoleInterface/Menu.cpp @@ -0,0 +1,72 @@ +#include "Menu.h" +#include "Toolbox.hpp" +#include <cstring> + +Menu::Menu() : menuOptions() {} + +unsigned indexOfCommandEnd(char* str) { + unsigned ind = 0; + std::cout << str[ind] << std::endl; + + return ind; +} + +void Menu::addCommand(const Command& command) { + menuOptions.add(command); +} + +/*! + * Prints the title, then an Error/Warning/Sucess message (if set), + * prints all command names as an ordered list (starting from 1), + * waits for user input to select one of those commands (by list number) + * and finally executes the appropriate command's run() function. + * + * After the run() function exists, everything is reprinted. + * The 0 list index is always "Go Back"/"Exit" and it always stops the reprinting loop. + * + * If there are no commands, prints "Menu is empty!". + * If user input doesn't correspond to any command, registers an error message and reprints. + */ +void Menu::navigate() const { + if (menuOptions.get_count() == 0) { + printLine("Menu is empty!"); + return; + } + + char buffer[MAX_LINE_WIDTH]; + + unsigned startIndex, commandEnd, paramsStart, index; + bool hasThrown = false; + while (!hasThrown) { + startIndex = 0; + inputLineBox(buffer, MAX_LINE_WIDTH, false); + + while (buffer[startIndex] == ' ') startIndex++; + + commandEnd = startIndex; + while (buffer[commandEnd] != ' ' && buffer[commandEnd] != '\n' && buffer[commandEnd] != '\0') + commandEnd++; + + index = menuOptions.get_count(); + for (unsigned i = 0; i < menuOptions.get_count() && index == menuOptions.get_count(); i++) { + if (strncmp(buffer + startIndex, menuOptions[i].get_name(), commandEnd - startIndex) == 0) + index = i; + } + + paramsStart = startIndex + commandEnd; + while (buffer[paramsStart] == ' ') paramsStart++; + + if (index == menuOptions.get_count()) { + printLine("Invalid menu option!"); + continue; + } + + try { + menuOptions[index].run(buffer + paramsStart); + } + catch (std::logic_error err) { + hasThrown = true; + printLine(err.what()); + } + } +} |