Added JsonUtils to post-process written json (backported from master)

src/libslic3r/CMakeLists.txt

@@ -509,6 +509,8 @@ set(SLIC3R_SOURCES
     Arachne/WallToolPaths.hpp
     Arachne/WallToolPaths.cpp
     StaticMap.hpp
+    Utils/JsonUtils.hpp
+    Utils/JsonUtils.cpp
 )
 
 add_library(libslic3r STATIC ${SLIC3R_SOURCES})

src/libslic3r/Utils/JsonUtils.cpp

@@ -0,0 +1,24 @@
+#include "JsonUtils.hpp"
+#include <boost/algorithm/string/replace.hpp>
+#include <regex>
+
+namespace Slic3r {
+
+namespace pt = boost::property_tree;
+
+std::string write_json_with_post_process(const pt::ptree& ptree)
+{
+    std::stringstream oss;
+    pt::write_json(oss, ptree);
+
+    // fix json-out to show node values as a string just for string nodes
+    std::regex reg("\\\"([0-9]+\\.{0,1}[0-9]*)\\\""); // code is borrowed from https://stackoverflow.com/questions/2855741/why-does-boost-property-tree-write-json-save-everything-as-string-is-it-possibl
+    std::string result = std::regex_replace(oss.str(), reg, "$1");
+
+    boost::replace_all(result, "\"true\"", "true");
+    boost::replace_all(result, "\"false\"", "false");
+
+    return result;
+}
+
+} // namespace Slic3r

src/libslic3r/Utils/JsonUtils.hpp

@@ -0,0 +1,12 @@
+#ifndef slic3r_JsonUtils_hpp_
+#define slic3r_JsonUtils_hpp_
+
+#include <boost/property_tree/json_parser.hpp>
+
+namespace Slic3r {
+
+std::string write_json_with_post_process(const boost::property_tree::ptree& ptree);
+
+} // namespace Slic3r
+
+#endif // slic3r_jsonUtils_hpp_