RElement.cxx

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/*************************************************************************
 * Copyright (C) 1995-2020, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
#include <ROOT/Browsable/RElement.hxx>
 
#include <ROOT/Browsable/RLevelIter.hxx>
#include <ROOT/Browsable/RItem.hxx>
#include <ROOT/RLogger.hxx>
 
#include "TBufferJSON.h"
 
using namespace ROOT::Experimental::Browsable;
using namespace std::string_literals;
 
ROOT::Experimental::RLogChannel &ROOT::Experimental::BrowsableLog() {
   static RLogChannel sLog("ROOT.Browsable");
   return sLog;
}
 
 
/////////////////////////////////////////////////////////////////////
/// Returns child iterator (if any)
 
std::unique_ptr<RLevelIter> RElement::GetChildsIter()
{
   return nullptr;
}
 
/////////////////////////////////////////////////////////////////////
/// Returns number of childs
/// By default creates iterator and iterates over all items
 
int RElement::GetNumChilds()
{
   auto iter = GetChildsIter();
   if (!iter) return 0;
   int cnt = 0;
   while (iter->Next()) cnt++;
   return cnt;
}
 
/////////////////////////////////////////////////////////////////////
/// Find item with specified name
/// Default implementation, should work for all
 
RElement::EContentKind RElement::GetContentKind(const std::string &kind)
{
    std::string lkind = kind;
    std::transform(lkind.begin(), lkind.end(), lkind.begin(), ::tolower);
 
   if (lkind == "text") return kText;
   if ((lkind == "image") || (lkind == "image64")) return kImage;
   if (lkind == "png") return kPng;
   if ((lkind == "jpg") || (lkind == "jpeg")) return kJpeg;
   if (lkind == "json") return kJson;
   if (lkind == "filename") return kFileName;
   return kNone;
}
 
/////////////////////////////////////////////////////////////////////
/// Returns sub element
 
std::shared_ptr<RElement> RElement::GetSubElement(std::shared_ptr<RElement> &elem, const RElementPath_t &path)
{
   auto curr = elem;
 
   for (auto &itemname : path) {
      if (!curr)
         return nullptr;
 
      auto iter = curr->GetChildsIter();
      if (!iter || !iter->Find(itemname))
         return nullptr;
 
      curr = iter->GetElement();
   }
 
   return curr;
}
 
/////////////////////////////////////////////////////////////////////
/// Returns string content like text file content or json representation
 
std::string RElement::GetContent(const std::string &kind)
{
   if (GetContentKind(kind) == kJson) {
      auto obj = GetObject();
      if (obj)
         return TBufferJSON::ConvertToJSON(obj->GetObject(), obj->GetClass()).Data();
   }
 
   return ""s;
}
 
 
/////////////////////////////////////////////////////////////////////
/// Returns item with element description
 
std::unique_ptr<RItem> RElement::CreateItem() const
{
   auto item = std::make_unique<RItem>(GetName());
   item->SetTitle(GetTitle());
   return item;
}
 
/////////////////////////////////////////////////////////////////////
/// Parse string path to produce RElementPath_t
/// One should avoid to use string pathes as much as possible
 
RElementPath_t RElement::ParsePath(const std::string &strpath)
{
   RElementPath_t arr;
   if (strpath.empty())
      return arr;
 
   std::string slash = "/";
 
   std::string::size_type previous = 0;
   if (strpath[0] == slash[0]) previous++;
 
   auto current = strpath.find(slash, previous);
   while (current != std::string::npos) {
      if (current > previous)
         arr.emplace_back(strpath.substr(previous, current - previous));
      previous = current + 1;
      current = strpath.find(slash, previous);
   }
 
   if (previous < strpath.length())
      arr.emplace_back(strpath.substr(previous));
 
   return arr;
}
 
/////////////////////////////////////////////////////////////////////
/// Compare two paths,
/// Returns number of elements matches in both paths
 
int RElement::ComparePaths(const RElementPath_t &path1, const RElementPath_t &path2)
{
   int sz = path1.size();
   if (sz > (int) path2.size()) sz = path2.size();
 
   for (int n = 0; n < sz; ++n)
      if (path1[n] != path2[n])
         return n;
 
   return sz;
}
 
/////////////////////////////////////////////////////////////////////
/// Converts element path back to string
 
std::string RElement::GetPathAsString(const RElementPath_t &path)
{
   std::string res;
   for (auto &elem : path) {
      res.append("/");
      std::string subname = elem;
      ExtractItemIndex(subname);
      res.append(subname);
   }
 
   return res;
}
 
/////////////////////////////////////////////////////////////////////
/// Extract index from name
/// Index coded by client with `###<indx>$$$` suffix
/// Such coding used by browser to identify element by index
 
int RElement::ExtractItemIndex(std::string &name)
{
   auto p1 = name.rfind("###"), p2 = name.rfind("$$$");
   if ((p1 == std::string::npos) || (p2 == std::string::npos) || (p1 >= p2) || (p2 != name.length()-3)) return -1;
 
   int indx = std::stoi(name.substr(p1+3,p2-p1-3));
   name.resize(p1);
   return indx;
}