Finish up the cli driver

src/base/cyoa.leg

@@ -153,22 +153,6 @@ void append_body(Page *page, char *str) {
   }
 }
 
-void print_page(Page *page) {
-  printf("HEADER: %s\nBODY: %s\n", page->id, page->body);
-  switch (page->footer.type) {
-  case FooterType::End:
-    printf("THE END\n");
-    break;
-  case FooterType::Goto:
-    printf("GOTO %s\n", page->footer.link);
-    break;
-  case FooterType::Choices:
-    printf("CHOICES:\n");
-    // TODO
-    break;
-  }
-}
-
 std::vector<Page*> CyoaParse(FILE *file) {
   yyin = file;
   yyparse();

src/base/storybook.cpp

@@ -56,10 +56,9 @@ void Storybook::Advance() {
   }
 }
 
-void Storybook::Advance(int choice_option) {
-  // TODO throw an exception if the ending type is not choices.
+void Storybook::Advance(int choice_option) { 
   if (!IsChoiceAvailable(choice_option)) {
-    // TODO throw exception?
+    throw IllegalChoiceException();
   }
   
   Choice* choice = (*current->footer.choices)[choice_option];
@@ -122,9 +121,13 @@ void Storybook::Play() {
     printf("Make a selection: ");
     int choice_option;
     std::cin >> choice_option;
-    Advance(choice_option);
+    try {
+      Advance(choice_option);
+    } catch (IllegalChoiceException e) {
+      printf("You can't do that!\n\n");
+    }
     break;
   default:
-    IsEnded = true; // TODO
+    IsEnded = true;
   }
 }

src/base/storybook.h

@@ -31,6 +31,12 @@ public:
 
   // This will probably be moved to the cli driver
   void Play();
+
+  class IllegalChoiceException : std::exception {
+    virtual const char *what() const noexcept {
+      return "Illegal Choice.";
+    }
+  };
 };
 
 #endif /* STORYBOOK_H */