import from github

tools/jsonproc/jsonproc.cpp

@@ -0,0 +1,109 @@
+// jsonproc.cpp
+
+#include "jsonproc.h"
+
+#include <map>
+
+#include <string>
+using std::string; using std::to_string;
+
+#include <inja.hpp>
+using namespace inja;
+using json = nlohmann::json;
+
+std::map<string, string> customVars;
+
+void set_custom_var(string key, string value)
+{
+    customVars[key] = value;
+}
+
+string get_custom_var(string key)
+{
+    return customVars[key];
+}
+
+int main(int argc, char *argv[])
+{
+    if (argc != 4)
+        FATAL_ERROR("USAGE: jsonproc <json-filepath> <template-filepath> <output-filepath>\n");
+
+    string jsonfilepath = argv[1];
+    string templateFilepath = argv[2];
+    string outputFilepath = argv[3];
+
+    Environment env;
+
+    // Add custom command callbacks.
+    env.add_callback("doNotModifyHeader", 0, [jsonfilepath, templateFilepath](Arguments& args) {
+        return "//\n// DO NOT MODIFY THIS FILE! It is auto-generated from " + jsonfilepath +" and Inja template " + templateFilepath + "\n//\n";
+    });
+
+    env.add_callback("subtract", 2, [](Arguments& args) {
+        int minuend = args.at(0)->get<int>();
+        int subtrahend = args.at(1)->get<int>();
+
+        return minuend - subtrahend;
+    });
+
+    env.add_callback("setVar", 2, [=](Arguments& args) {
+        string key = args.at(0)->get<string>();
+        string value = args.at(1)->get<string>();
+        set_custom_var(key, value);
+        return "";
+    });
+
+    env.add_callback("setVarInt", 2, [=](Arguments& args) {
+        string key = args.at(0)->get<string>();
+        string value = to_string(args.at(1)->get<int>());
+        set_custom_var(key, value);
+        return "";
+    });
+
+    env.add_callback("getVar", 1, [=](Arguments& args) {
+        string key = args.at(0)->get<string>();
+        return get_custom_var(key);
+    });
+
+    env.add_callback("concat", 2, [](Arguments& args) {
+        string first = args.at(0)->get<string>();
+        string second = args.at(1)->get<string>();
+        return first + second;
+    });
+
+    env.add_callback("removePrefix", 2, [](Arguments& args) {
+        string rawValue = args.at(0)->get<string>();
+        string prefix = args.at(1)->get<string>();
+        string::size_type i = rawValue.find(prefix);
+        if (i != 0)
+            return rawValue;
+
+        return rawValue.erase(0, prefix.length());
+    });
+
+    env.add_callback("removeSuffix", 2, [](Arguments& args) {
+        string rawValue = args.at(0)->get<string>();
+        string suffix = args.at(1)->get<string>();
+        string::size_type i = rawValue.rfind(suffix);
+        if (i == string::npos)
+            return rawValue;
+
+        return rawValue.substr(0, i);
+    });
+
+    // single argument is a json object
+    env.add_callback("isEmpty", 1, [](Arguments& args) {
+        return args.at(0)->empty();
+    });
+
+    try
+    {
+        env.write_with_json_file(templateFilepath, jsonfilepath, outputFilepath);
+    }
+    catch (const std::exception& e)
+    {
+        FATAL_ERROR("JSONPROC_ERROR: %s\n", e.what());
+    }
+
+    return 0;
+}