raspikeyer/src/morse.cpp

// #include <algorithm>
#include <map>
#include <string>
// #include <regex>

#include "morse.h"

std::map<char, std::string> morseMap = {
    {'A', ".-"},
    {'B', "-..."},
    {'C', "-.-."},
    {'D', "-.."},
    {'E', "."},
    {'F', "..-."},
    {'G', "--."},
    {'H', "...."},
    {'I', ".."},
    {'J', ".---"},
    {'K', "-.-"},
    {'L', ".-.."},
    {'M', "--"},
    {'N', "-."},
    {'O', "---"},
    {'P', ".--."},
    {'Q', "--.-"},
    {'R', ".-."},
    {'S', "..."},
    {'T', "-"},
    {'U', "..-"},
    {'V', "...-"},
    {'W', ".--"},
    {'X', "-..-"},
    {'Y', "-.--"},
    {'Z', "--.."},
    {'1', ".----"},
    {'2', "..---"},
    {'3', "...--"},
    {'4', "....-"},
    {'5', "....."},
    {'6', "-...."},
    {'7', "--..."},
    {'8', "---.."},
    {'9', "----."},
    {'0', "-----"},
    {',', "--..--"},
    {'.', ".-.-.-"},
    {'?', "..--.."},
    {':', "---..."},
    {'&', ".-..."},
    // Some WinKeyer compatible mappings …
    {'\"', ".-..-."}, // " => <RR>
    {'$', "...-..-"}, // $ => <SX>
    {'\'', ".----."}, // ' => <WG>
    {'(', "-.--."},   // ( => <KN>
    {')', "-.--.-"},  // ) => <KK>
    {'+', ".-.-."},   // + => <AR>
    {'-', "-....-"},  // - => <DU>
    {'/', "-..-."},   // / => <DN>
    {':', "-.--."},   // : => <KN>
    {';', ".-.-"},    // ; => <AA>
    {'<', ".-.-."},   // < => <AR> [sic!]
    {'=', "-...-"},   // = => <BT>
    {'>', "...-.-"},  // > == <SK>
    {'@', ".--.-."},  // @ => <AC>
    {'[', ".-..."},   // [ => <AS>
    {'\\', "-..-."},  // \ => <DN>
    {']', "-.--."},   // ] => <KN> [sic!]
};

/*
void refurbishMessage(std::string &msg)
{
    // Make the message all upper case
    std::transform(msg.begin(), msg.end(), msg.begin(), ::toupper);

    // Encode the special characters as we like it
    msg = std::regex_replace(msg, std::regex("<BT>"), "=");
    msg = std::regex_replace(msg, std::regex("<BK>"), "b");
    msg = std::regex_replace(msg, std::regex("<KN>"), "k");
    msg = std::regex_replace(msg, std::regex("<SK>"), "s");
    msg = std::regex_replace(msg, std::regex("<AR>"), "+");
    msg = std::regex_replace(msg, std::regex("<KA>"), "a");

    // Remove all other unknown characters
    msg.erase(remove_if(msg.begin(), msg.end(),
                        [](const char &c) { return c != ' ' && morseMap.find(c) == morseMap.end(); }),
              msg.end());

    // Remove spaces, if there are too many of them
    msg = std::regex_replace(msg, std::regex("(\\s+)"), " ");
}
*/

std::string messageToMorse(std::string &msg)
{
    // refurbishMessage(msg);

    std::string morseString {};

    for (unsigned int i = 0; i < msg.length(); i++) {
        char c = msg[i];
        if (c == ' ') {
            morseString.push_back('w');
            continue;
        }

        // Ignore and continue with next char, if not found
        auto search = morseMap.find(c);
        if (search == morseMap.end()) {
            continue;
        }

        for (unsigned int j = 0; j < morseMap[c].length(); j++) {
            char m = morseMap[c][j];
            if (j == 0 && i > 0 && msg[i - 1] != ' ') {
                morseString.push_back('c');
            }

            morseString += m;

            if (j < morseMap[c].length() - 1) {
                morseString.push_back('i');
            }
        }
    }

    // Append word space if last char was not a blank
    if (msg.back() != ' ') {
        morseString.push_back('w');
    }

    return morseString;
}

std::string charToMorse(const char ch)
{
    std::string morseString {};

    if (ch == ' ') {
        morseString.push_back('w');
        return morseString;
    }

    for (unsigned int j = 0; j < morseMap[ch].length(); j++) {
        char m = morseMap[ch][j];

        morseString += m;

        if (j < morseMap[ch].length() - 1) {
            morseString.push_back('i');
        }
    }

    morseString.push_back('c');

    return morseString;
}

bool charToMorse(const char ch, char *morseSymbols)
{
    size_t index {0};

    if (ch != ' ' && !morseMap.contains(ch)) {
        return false;
    }

    if (ch == ' ') {
        morseSymbols[index++] = 'w';
    } else {
        for (unsigned int i = 0; i < morseMap[ch].length(); i++) {
            char m = morseMap[ch][i];

            morseSymbols[index++] = m;

            if (i < morseMap[ch].length() - 1) {
                morseSymbols[index++] = 'i';
            }
        }

        morseSymbols[index++] = 'c';
    }

    morseSymbols[index] = '\0';

    return true;
}