parser.y

%{
    #include <stdio.h>
    
    int yylex();
    int yyerror();

    int yylineno;

    void header();
    void print_default_delay();
    void print_string();
    void footer();

    int d = 0;
%}

%token alt altgr backspace default_delay delay menu pause_key capslock ctrl delete down end enter esc function gui home insert left letter new_line numlock pagedown pageup printscreen rem repeat right scrolllock separator shift space string tab up

// required to get text
%union {
    char *text;
    int integer;
}

%%
file: {header();} blocs {footer();}

blocs: bloc blocs
     | bloc

bloc: line repeat new_line
    | line

line: keys {printf("  Keyboard.releaseAll();\n");print_default_delay();} new_line
    | delay {printf("  delay(%d);\n", yylval.integer*10);} new_line
    | default_delay {d = yylval.integer*10;} new_line
    | rem {printf("  // %s\n", yylval.text);} new_line
    | string {print_string(yylval.text);print_default_delay();} new_line
    | new_line {printf("\n");}

keys: key separator keys
    | key

key: alt {printf("  Keyboard.press(KEY_LEFT_ALT);\n");}
   | altgr {printf("  Keyboard.press(KEY_RIGHT_ALT);\n");}
   | backspace {printf("  Keyboard.press(KEY_BACKSPACE);\n");}
   | menu {printf("  Keyboard.press(0x76+0x88);\n");}
   | pause_key {printf("  Keyboard.press(0x48+0x88);\n");}
   | capslock {printf("  Keyboard.press(KEY_CAPS_LOCK);\n");}
   | ctrl {printf("  Keyboard.press(KEY_LEFT_CTRL);\n");}
   | delete {printf("  Keyboard.press(KEY_DELETE);\n");}
   | down {printf("  Keyboard.press(KEY_DOWN_ARROW);\n");}
   | end {printf("  Keyboard.press(KEY_END);\n");}
   | enter {printf("  Keyboard.press(KEY_RETURN);\n");}
   | esc {printf("  Keyboard.press(KEY_ESC);\n");}
   | function {printf("  Keyboard.press(KEY_F%d);\n", yylval.integer);}
   | gui {printf("  Keyboard.press(KEY_LEFT_GUI);\n");}
   | home {printf("  Keyboard.press(KEY_HOME);\n");}
   | insert {printf("  Keyboard.press(KEY_INSERT);\n");}
   | left {printf("  Keyboard.press(KEY_LEFT_ARROW);\n");}
   | numlock {printf("  Keyboard.press(0x53+0x88);\n");}
   | pagedown {printf("  Keyboard.press(KEY_PAGE_DOWN);\n");}
   | pageup {printf("  Keyboard.press(KEY_PAGE_UP);\n");}
   | printscreen {printf("  Keyboard.press(0x46+0x88);\n");}
   | right {printf("  Keyboard.press(KEY_RIGHT_ARROW);\n");}
   | scrolllock {printf("  Keyboard.press(0x47+0x88);\n");}
   | shift {printf("  Keyboard.press(KEY_LEFT_SHIFT);\n");}
   | space {printf("  Keyboard.press(' ');\n");}
   | tab {printf("  Keyboard.press(KEY_TAB);\n");}
   | up {printf("  Keyboard.press(KEY_UP_ARROW);\n");}
   | letter {printf("  Keyboard.press('%s');\n", yylval.text);}
%%

int yyerror(char *s) {
    printf("\033[31merror:\033[0m %s \033[32m(l.%d)\033[0m\n",s,yylineno);
    return 0;
}

void header() {
    printf("#include <Keyboard.h>\n\n");
    printf("void setup() {\n");
    printf("  // keyboard connection\n");
    printf("  Keyboard.begin();\n");
    printf("  delay(500);\n\n");
}

void print_default_delay() {
    if (d != 0) {
        printf("  delay(%d);\n", d);
    }
}

void print_string(char *s) {
    printf("  Keyboard.print(\"");

    int i = 0;
    while (s[i] != '\0') {
        if (s[i] == '\"' || s[i] == '\\') {
            printf("\\");
        }
        printf("%c", s[i]);
        i++;
    }

    printf("\");\n");
}

void footer() {
    printf("\n");
    printf("  // keyboard disconnection\n");
    printf("  Keyboard.end();\n");
    printf("}\n\n");
    printf("void loop() {}\n");
}

int main(void) {
    yyparse();
    return 0;
}