XMLParserUtilities.h

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/*
 * Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration.
 */
 
#ifndef XMLCoreParser_XMLParserUtilities_H
#define XMLCoreParser_XMLParserUtilities_H
 
#include <expat.h>
#include <cstdlib> //getenv
#include <string>
#include <source_location>
#include <memory>
#include <iostream>
 
 
namespace XmlParser{
   std::string
   xmlFileName(const std::string & fname, const std::string & prefix="");
   
  inline bool 
  debug_enabled() {
    static const bool enabled = (std::getenv("XMLDEBUG") != nullptr);
    return enabled;
  }
  
  inline std::string 
  label(const std::source_location loc = std::source_location::current()){
    return loc.function_name();
  }
  
  struct XMLParserDeleter {
    void operator()(XML_Parser p) const noexcept {
      if (p) {
        XML_ParserFree(p);
      }
    }
  };

  using XMLParserPtr = std::unique_ptr<std::remove_pointer_t<XML_Parser>, XMLParserDeleter>;
  
  inline XMLParserPtr make_parser(){
    XML_Parser p = XML_ParserCreate(nullptr);
    if (!p) {
      std::cout << "ExpatCoreParser::Couldn't allocate memory for parser" << std::endl;
      std::abort();
    }
    return XMLParserPtr{p};
  }

  inline std::string 
  rtrim(const XML_Char* s, int len){
    while (len > 0 && s[len - 1] == '\n') {
      --len;
    }
    return (len > 0) ? std::string{s, static_cast<std::size_t>(len)} : std::string{};
  }
}
 
 
#endif