Some more c++ stuff, add possible lr grammar (glr?)

src/base/storybook.cpp

@@ -8,7 +8,29 @@ Storybook::Storybook(FILE* fin) {
   pages = CyoaParse(fin);
 }
 
-void Storybook::Find(const char* id) {
+void Storybook::UpdateStat(const char *key, int rel) {
+  auto it = stats.find(key);
+  if (it == stats.end()) {
+    // Key not present
+    stats[key] = 0;
+  } else {
+    // Key present, add the rel
+    stats[key] = it->second + rel;
+  }
+}
+
+int Storybook::LookupStat(const char *key) {
+  auto it = stats.find(key);
+  if (it == stats.end()){
+    stats[key] = 0;
+    return 0;
+  } else {
+    return it->second;
+  }
+  return 0;
+}
+
+void Storybook::Find(const char *id) {
   for (Page* page : pages) {
     if (strcmp(page->id, id) == 0) {
       current = page;
@@ -19,6 +41,41 @@ void Storybook::Find(const char* id) {
   current = NULL;
 }
 
+void Storybook::Advance() {
+  // TODO throw an exception if the ending type is choices
+  switch(current->footer.type) {
+  case FooterType::End:
+    IsEnded = true;
+    current = NULL;
+    return;
+  case FooterType::Goto:
+    Find(current->footer.link);
+    return;
+  }
+}
+
+void Storybook::Advance(int choice_key) {
+  // TODO throw an exception if the ending type is not choices.
+  Choice* choice = (*current->footer.choices)[choice_key];
+  if (!choice) {
+    // TODO throw exception?
+  }
+
+  if (auto ck = choice->statcheck) {
+    int val = LookupStat(ck->stat);
+    if (ck->rel == STATCHECK_GT && val < ck->value ||
+	ck->rel == STATCHECK_LT && val > ck->value) {
+      // TODO throw different exception?
+    }
+  }
+
+  if (auto cg = choice->statchange) {
+    UpdateStat(cg->stat, cg->addend);
+  }
+
+  Find(choice->id);
+}
+
 void print_choice(Choice* c) {
   printf("%d) %s", c->option, c->flavor);
   if (c->statcheck) {
@@ -32,14 +89,15 @@ void print_choice(Choice* c) {
 
 void Storybook::Play() {
   printf(current->body);
+  Choice *choice;
 
   switch (current->footer.type) {
   case FooterType::End:
     printf("The End.");
-    IsEnded = true;
+    Advance();
     break;
   case FooterType::Goto:
-    Find(current->footer.link);
+    Advance();
     printf("Press ENTER to continue...");
     std::cin.get();
     break;
@@ -48,9 +106,9 @@ void Storybook::Play() {
       print_choice(c.second);
     }
     printf("Make a selection: ");
-    int choice;
-    std::cin >> choice;
-    Find((*current->footer.choices)[choice]->id);
+    int choice_option;
+    std::cin >> choice_option;
+    Advance(choice_option);
     break;
   default:
     IsEnded = true; // TODO

src/base/storybook.h

@@ -2,18 +2,32 @@
 #define STORYBOOK_H
 
 #include <vector>
+#include <unordered_map>
+#include <string>
 #include <cstdio>
 #include "cyoa.h"
 
 class Storybook {
 private:
   std::vector<Page*> pages;
+  std::unordered_map<const char*, int> stats;
   Page *current;
 public:
   Storybook(FILE* fin);
+  
+  // Functions for looking up and printing stats
+  void UpdateStat(const char*, int);
+  int LookupStat(const char*);
+  std::vector<std::string> GetDefinedStats();
+
+  // Functions to change the game state
   void Find(const char*);
-  void Play();
+  void Advance(); // For Goto and End cases
+  void Advance(int); // For Choices
   bool IsEnded = false;
+
+  // This will probably be moved to the cli driver
+  void Play();
 };
 
 #endif /* STORYBOOK_H */