Add initial keyboard_input parser and tests

The current implementation SEGFAULTs when F characters are followed by
end of string.

src/keyboard_input/input_parser.cpp

@@ -0,0 +1,103 @@
+#include "input_parser.h"
+
+std::optional<Token> getModifier( const char& character )
+{
+    switch ( character )
+    {
+    case '^':
+        return Token::MODIFIER_CTRL;
+    case '*':
+        return Token::MODIFIER_ALT;
+    case '>':
+        return Token::MODIFIER_SHIFT;
+    case '/':
+        return Token::MODIFIER_ALTGR;
+    case '#':
+        return Token::MODIFIER_SUPER;
+    default:
+        return std::nullopt;
+    }
+}
+
+std::optional<Token> getNumberOrLetter( const char& character )
+{
+    if ( islower( character ) || isdigit( character ) )
+    {
+        return static_cast<Token>( character );
+    }
+    return std::nullopt;
+}
+
+std::optional<Token> getFunctionNumber( const char& character )
+{
+    switch ( character )
+    {
+    case '1':
+        return Token::KEY_F1;
+    case '2':
+        return Token::KEY_F2;
+    case '3':
+        return Token::KEY_F3;
+    case '4':
+        return Token::KEY_F4;
+    case '5':
+        return Token::KEY_F5;
+    case '6':
+        return Token::KEY_F6;
+    case '7':
+        return Token::KEY_F7;
+    case '8':
+        return Token::KEY_F8;
+    case '9':
+        return Token::KEY_F9;
+
+    default:
+        // LOG incorrect character
+        return std::nullopt;
+    }
+}
+
+std::vector<Token> ParseKeyboardInputsToTokens( const std::string inputs )
+{
+    std::vector<Token> tokens{};
+
+    for ( auto ch = inputs.begin(); ch != inputs.end(); ++ch )
+    {
+        if ( const auto c = getNumberOrLetter( *ch ); c.has_value() )
+        {
+            tokens.push_back( *c );
+            continue;
+        }
+        if ( const auto c = getModifier( *ch ); c.has_value() )
+        {
+            tokens.push_back( *c );
+            continue;
+        }
+
+        if ( !isupper( *ch ) )
+        {
+            // LOG incorrect character
+            continue;
+        }
+        // Everything below is upper case
+
+        if ( *ch == 'F' )
+        {
+            ++ch;
+            const auto token = getFunctionNumber( *ch );
+            if ( token.has_value() )
+            {
+                tokens.push_back( *token );
+                continue;
+            }
+            else
+            {
+                // Spec says to abort on errors and submit correct values before
+                // error.
+                break;
+            }
+        }
+    }
+
+    return tokens;
+}

src/keyboard_input/input_parser.h

@@ -0,0 +1,91 @@
+#pragma once
+#include <string>
+#include <vector>
+#include <cctype>
+#include <optional>
+
+enum class Token
+{
+    // Literals
+    KEY_a = 'a',
+    KEY_b = 'b',
+    KEY_c = 'c',
+    KEY_d = 'd',
+    KEY_e = 'e',
+    KEY_f = 'f',
+    KEY_g = 'g',
+    KEY_h = 'h',
+    KEY_i = 'i',
+    KEY_j = 'j',
+    KEY_k = 'k',
+    KEY_l = 'l',
+    KEY_m = 'm',
+    KEY_n = 'n',
+    KEY_o = 'o',
+    KEY_p = 'p',
+    KEY_q = 'q',
+    KEY_r = 'r',
+    KEY_s = 's',
+    KEY_t = 't',
+    KEY_u = 'u',
+    KEY_v = 'v',
+    KEY_w = 'w',
+    KEY_x = 'x',
+    KEY_y = 'y',
+    KEY_z = 'z',
+
+    KEY_0 = '0',
+    KEY_1 = '1',
+    KEY_2 = '2',
+    KEY_3 = '3',
+    KEY_4 = '4',
+    KEY_5 = '5',
+    KEY_6 = '6',
+    KEY_7 = '7',
+    KEY_8 = '8',
+    KEY_9 = '9',
+
+    KEY_F1,
+    KEY_F2,
+    KEY_F3,
+    KEY_F4,
+    KEY_F5,
+    KEY_F6,
+    KEY_F7,
+    KEY_F8,
+    KEY_F9,
+
+    KEY_BACKSPACE,
+    KEY_SPACE,
+    KEY_TAB,
+    KEY_ESC,
+    KEY_INS,
+    KEY_DEL,
+    KEY_END,
+    KEY_PGDN,
+    KEY_PGUP,
+    KEY_CAPS,
+    KEY_PRNSCRN,
+    KEY_PAUSE,
+    KEY_SCRLOCK,
+    KEY_LEFTARROW,
+    KEY_RIGHTARROW,
+    KEY_UPARROW,
+    KEY_DOWNARROW,
+    KEY_KPSLASH,
+    KEY_KPSTAR,
+    KEY_KPMINUS,
+    KEY_KPPLUS,
+
+    // Misc tokens
+    TOKEN_NEW_SEQUENCE,
+
+    // Modifiers
+    MODIFIER_CTRL,
+    MODIFIER_ALT,
+    MODIFIER_SHIFT,
+    MODIFIER_ALTGR,
+    MODIFIER_SUPER,
+};
+
+std::vector<Token> ParseKeyboardInputsToTokens( std::string inputs );