1 files changed, 55 insertions, 3 deletions

diff --git a/src/utils.h b/src/utils.h
index bf789e1..dea052b 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -1,15 +1,17 @@
 #pragma once
 #include "json.hpp"
+#include "entry.h"
 #include <string>
 #include <vector>
 #include <map>
 #include <sstream>
 #include <memory>
 #include <stdexcept>
+#include <filesystem>
 
 namespace utils {
-    nlohmann::json loadJson(const std::string& path);
-    
+    nlohmann::json loadJson(const std::filesystem::path& path);
+
     // Recursively loads all .json files under directory
     // If called multiple times with same directory, returns a cached result.
     std::vector<nlohmann::json> loadAllJson(const std::string& directory);
@@ -20,11 +22,31 @@ namespace utils {
     // goes through the available types and searches for the one matching name.
     nlohmann::json findByName(const std::string& name);
 
-    void saveJson(const nlohmann::json& data, const std::string& path);
+    void saveJson(const nlohmann::json& data, const std::filesystem::path& path);
 
     // converts in-place
     std::string lower(std::string& in);
 
+    template<typename T> std::shared_ptr<T> instantiate(const std::filesystem::path& path) {
+        std::shared_ptr<entry::Entry> ent;
+        try {
+            ent = entry::Entry::create(loadJson(path));
+        } catch(std::exception& e) {
+            if(std::filesystem::directory_entry(path).exists()) {
+                throw std::runtime_error("Invalid json: " + path.string());
+            } else {
+                throw std::runtime_error("No such file nor directory: " + path.string());
+            }
+        }
+        std::shared_ptr<T> t = std::dynamic_pointer_cast<T>(ent);
+        if(! t) {
+            throw std::runtime_error("Wrong instance type: " + ent->getType());
+        }
+        return t;
+    }
+
+    int parseInt(const std::string& s);
+
     template<typename S, typename D> std::shared_ptr<S> loadDFromJson(const nlohmann::json& data) {
         try {
             return std::shared_ptr<S>(new D(loadJson(data["type"], data["name"]), data));
@@ -78,4 +100,34 @@ namespace utils {
     std::string getCostString(int coppers);
 
     std::string toOrdinal(std::size_t number);
+
+    template<typename T> std::vector<T> json2vec(const nlohmann::json& data) {
+        using std::begin; using std::end;
+        return std::vector<T>(begin(data), end(data));
+    }
+
+    template<typename T> std::vector<std::shared_ptr<T>> jsonList2ptrvec(const std::string& type, const std::vector<std::string>& names) {
+        std::vector<std::shared_ptr<T>> ret;
+        for(auto name : names) {
+            auto j = utils::loadJson(type, name);
+            ret.push_back(std::shared_ptr<T>(new T(j, j)));
+        }
+        return ret;
+    }
+
+    template<typename T> std::vector<std::shared_ptr<T>> json2ptrvec(const nlohmann::json& data) {
+        std::vector<std::shared_ptr<T>> ret;
+        for(nlohmann::json d : data) {
+            ret.push_back(T::create(d));
+        }
+        return ret;
+    }
+
+    template<typename T> std::vector<nlohmann::json> ptrvec2json(std::vector<T> src) {
+        std::vector<nlohmann::json> ret;
+        for(T i : src) {
+            ret.push_back(i->toJson());
+        }
+        return ret;
+    }
 }