Navigating IF nodes on the Game Boy

choiceNodes

/* In this version, each node in the story has a function
which displays text to the printer/screen, gives the
player options to choose from, and returns an enum of the
next node to go to based on that decision. */

typedef enum NODE {
  //nodes can have more descriptive names,
  //e.g. what part in the story you're in
  NODE1,
  NODE2,
  NODE3,
  NODE4
} NODE;

//define pointers to node functions
typedef NODE (*nodeFunction)(void);

//declare node functions
NODE node1();
NODE node2();
NODE node3();
NODE node4();

//create array of node functions
//functions have to be listed here in the
//same order as in the enum list
nodeFunction nodeTable[] = {
  node1,
  node2,
  node3,
  node4
};

NODE nextNode(NODE choiceNode){
//choicenode is the NODE returned from previous node function
  return nodeTable[choiceNode]();
}

//define node functions
NODE node1(){
  //print text to printer
  //print choice options to screen
  //wait for user to pick an option
  if (option==1){ //return the next node based on option picked
    return NODE2;
  } else {
    return NODE3;
  }
}

NODE node2(){};
NODE node3(){};
NODE node4(){};

void main(){
  NODE nextNodeEnum = node1(); //get first choice
  while(1) { //chain together nodes based on choices
    nextNodeEnum = nextNode(nextNodeEnum);
  }
}