abg-libxml-utils.h

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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// -*- mode: C++ -*-
//
// Copyright (C) 2013-2025 Red Hat, Inc.
 
/// @file
 
#ifndef __ABG_LIBXML_UTILS_H__
#define __ABG_LIBXML_UTILS_H__
 
#include <libxml/xmlreader.h>
 
#include <istream>
#include <memory>
 
#include "abg-sptr-utils.h"
 
namespace abigail
{
 
/// Internal namespace for xml manipulation utilities.
namespace xml
{
 
using sptr_utils::build_sptr;
using std::shared_ptr;
 
/// A convenience typedef for a shared pointer of xmlTextReader.
typedef shared_ptr<xmlTextReader> reader_sptr;
 
/// A convenience typedef for a shared pointer of xmlChar.
typedef shared_ptr<xmlChar> xml_char_sptr;
 
/// This functor is used to instantiate a shared_ptr for the
/// xmlTextReader.
struct textReaderDeleter
{
  void
  operator()(xmlTextReaderPtr reader)
  {xmlFreeTextReader(reader);}
};
 
/// This functor is used to instantiate a shared_ptr for xmlChar
struct charDeleter
{
  void
  operator()(xmlChar* str)
  { xmlFree(str); }
};
 
void initialize();
reader_sptr new_reader_from_file(const std::string& path);
reader_sptr new_reader_from_buffer(const std::string& buffer);
reader_sptr new_reader_from_istream(std::istream*);
bool xml_char_sptr_to_string(xml_char_sptr, std::string&);
 
int get_xml_node_depth(xmlNodePtr);
 
/// Get the name of the current element node the reader is pointing
/// to.  Note that this macro returns an instance of
/// shared_ptr<xmlChar> so that the caller doesn't have to worry about
/// managing memory itself.  Also note that the reader is a
/// shared_ptr<xmlTextReader>
#define XML_READER_GET_NODE_NAME(reader) \
  xml::build_sptr(xmlTextReaderName(reader.get()))
 
/// Get the type of the current node of the shared_ptr<xmlTextReader>
/// passed in argument.
#define XML_READER_GET_NODE_TYPE(reader) \
  static_cast<xmlReaderTypes> (xmlTextReaderNodeType(reader.get()))
 
/// Get the value of attribute 'name' on the current node of 'reader'
/// which is an instance of shared_ptr<xmlTextReader>.
#define XML_READER_GET_ATTRIBUTE(reader, name) \
  xml::build_sptr(xmlTextReaderGetAttribute(reader.get(), BAD_CAST(name)))
 
/// Get the value of attribute 'name' ont the instance of xmlNodePtr
/// denoted by 'node'.
#define XML_NODE_GET_ATTRIBUTE(node, name) \
  xml::build_sptr(xmlGetProp(node, BAD_CAST(name)))
 
#define CHAR_STR(xml_char_str) \
  reinterpret_cast<char*>(xml_char_str.get())
 
void
escape_xml_string(const std::string& str,
          std::string& escaped);
 
std::string
escape_xml_string(const std::string& str);
 
void
escape_xml_comment(const std::string& str,
           std::string& escaped);
 
std::string
escape_xml_comment(const std::string& str);
 
void
unescape_xml_string(const std::string& str,
            std::string& escaped);
 
std::string
unescape_xml_string(const std::string& str);
 
void
unescape_xml_comment(const std::string& str,
             std::string& escaped);
 
std::string
unescape_xml_comment(const std::string& str);
 
}//end namespace xml
 
namespace sptr_utils
{
/// Specialization of sptr_utils::build_sptr for xmlTextReader
template<>
xml::reader_sptr
build_sptr<xmlTextReader>(xmlTextReader *p);
 
/// Specialization of build_str for xmlChar.
template<>
xml::xml_char_sptr
build_sptr<xmlChar>(xmlChar *p);
}// end namespace sptr_utils
 
}//end namespace abigail
#endif //__ABG_LIBXML_UTILS_H__