BIFXMLBNReader_tpl.h

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/****************************************************************************
 *   This file is part of the aGrUM/pyAgrum library.                        *
 *                                                                          *
 *   Copyright (c) 2005-2026 by                                             *
 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
 *       - Christophe GONZALES(_at_AMU)                                     *
 *                                                                          *
 *   The aGrUM/pyAgrum library is free software; you can redistribute it    *
 *   and/or modify it under the terms of either :                           *
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 *    - the MIT license (MIT),                                              *
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 *   SPDX-FileCopyrightText: Copyright 2005-2026                            *
 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
 *       - Christophe GONZALES(_at_AMU)                                     *
 *   SPDX-License-Identifier: LGPL-3.0-or-later OR MIT                      *
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 *   Contact  : info_at_agrum_dot_org                                       *
 *   homepage : http://agrum.gitlab.io                                      *
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#pragma once
 
 
#include <agrum/BN/io/BIFXML/BIFXMLBNReader.h>   // to ease IDE parser
#ifndef DOXYGEN_SHOULD_SKIP_THIS
#  include <agrum/BN/io/BIFXML/BIFXMLBNReader.h>
 
#  include <agrum/base/core/utils_string.h>
 
namespace gum {
  /*
   * Constructor
   * A reader is created to reading a defined file.
   * Note that an BN as to be created before and given in parameter.
   */
  template < GUM_Numeric GUM_SCALAR >
  BIFXMLBNReader< GUM_SCALAR >::BIFXMLBNReader(BayesNet< GUM_SCALAR >* bn,
                                               std::string_view        filePath) :
      BNReader< GUM_SCALAR >(bn, filePath) {
    GUM_CONSTRUCTOR(BIFXMLBNReader);
    _bn_       = bn;
    _filePath_ = filePath;
  }
 
  /*
   * Constructor from an input stream.
   */
  template < GUM_Numeric GUM_SCALAR >
  BIFXMLBNReader< GUM_SCALAR >::BIFXMLBNReader(BayesNet< GUM_SCALAR >* bn, std::istream& stream) :
      BNReader< GUM_SCALAR >(bn, "<stream>") {
    GUM_CONSTRUCTOR(BIFXMLBNReader);
    _bn_           = bn;
    _isFromStream_ = true;
    _xmlContent_
        = std::string(std::istreambuf_iterator< char >(stream), std::istreambuf_iterator< char >());
  }
 
  /*
   * Default destructor.
   */
  template < GUM_Numeric GUM_SCALAR >
  BIFXMLBNReader< GUM_SCALAR >::~BIFXMLBNReader() {
    GUM_DESTRUCTOR(BIFXMLBNReader);
  }
 
  /*
   * Reads the bayes net from the file referenced by filePath  given at the
   * creation
   * of class
   * @return Returns the number of errors during the parsing (0 if none).
   */
  template < GUM_Numeric GUM_SCALAR >
  Size BIFXMLBNReader< GUM_SCALAR >::proceed() {
    try {
      // Loading file or parsing string
      std::string status = _isFromStream_ ? "Parsing XML content ..." : "Loading File ...";
      GUM_EMIT2(onProceed, 0, status);
 
      XmlDocument xmlDoc;
      if (_isFromStream_) {
        xmlDoc.parse(_xmlContent_);
      } else {
        xmlDoc = XmlDocument(_filePath_);
        xmlDoc.loadFile();
      }
 
      if (xmlDoc.noChildren()) {
        GUM_ERROR(IOError, ": Loading fail, please check the file for any syntax error.")
      }
 
      // Finding BIF element
      status = "File loaded. Now looking for BIF element ...";
      GUM_EMIT2(onProceed, 4, status);
 
      XmlElement bifElement = xmlDoc.firstChildElement("BIF");
 
      // Finding network element
      status = "BIF Element reached. Now searching network ...";
      GUM_EMIT2(onProceed, 7, status);
 
      XmlElement networkElement = bifElement.firstChildElement("NETWORK");
 
      // Reading network name (optional)
      XmlElement nameElement = networkElement.firstChildElement("NAME", false);
      if (!nameElement.isNull()) { _bn_->setProperty("name", nameElement.textOrDefault("")); }
 
      // Finding id variables
      status = "Network found. Now proceeding variables instantiation...";
      GUM_EMIT2(onProceed, 10, status);
 
      _parsingVariables_(networkElement);
 
      // Filling diagram
      status = "All variables have been instantiated. Now filling up diagram...";
      GUM_EMIT2(onProceed, 55, status);
 
      _fillingBN_(networkElement);
 
      status = "Instantiation of network completed";
      GUM_EMIT2(onProceed, 100, status);
 
      return 0;
    } catch (XmlException& xmlException) { GUM_ERROR(IOError, xmlException.what()) }
  }
 
  template < GUM_Numeric GUM_SCALAR >
  void BIFXMLBNReader< GUM_SCALAR >::_parsingVariables_(XmlElement parentNetwork) {
    int nbVar = 0;
    for (const auto& _: parentNetwork.children("VARIABLE")) {
      nbVar++;
    }
 
    // Iterating on variable element
    int nbIte = 0;
 
    for (const auto& currentVar: parentNetwork.children("VARIABLE")) {
      // Getting variable name
      XmlElement  varNameElement = currentVar.firstChildElement("NAME");
      std::string varName        = varNameElement.textOrDefault("");
 
      std::string description = "";
      std::string fast        = "";
      // Getting variable description and/or fast syntax
      for (const auto& property: currentVar.children("PROPERTY")) {
        const auto pair = gum::split(property.textOrDefault(""), "=");
        if (pair.size() == 2) {
          const auto propertyName = gum::toLower(gum::trim_copy(pair[0]));
          const auto value        = gum::trim_copy(pair[1]);
          // check for descritpion and fast
          if (propertyName == "description") {
            description = value;
          } else if (propertyName == "fast") {
            fast = value;
          }
        }
      }
 
      if (fast == "") {
        // if no fast syntax, we create a variable with the default}
        // Instanciation de la variable
        auto newVar = new LabelizedVariable(varName, description, 0);
 
        // Getting variable outcomes
        for (const auto& outcome: currentVar.children("OUTCOME"))
          newVar->addLabel(outcome.textOrDefault(""));
 
        // Add the variable to the bn and then delete newVar (add makes a copy)
        _bn_->add(*newVar);
        delete newVar;
      } else {
        auto newVar = gum::fastVariable(fast, 2);
        newVar->setDescription(description);
        // we could check if varName is OK
        if (newVar->name() != varName) {
          GUM_ERROR(IOError,
                    "Variable name (" << varName << ") and fast syntax (" << fast
                                      << ") are not compatible. Please check the syntax.")
        }
        // Add the variable to the bn and then delete newVar (add makes a copy)
        _bn_->add(*newVar);
      }
 
      // Emitting progress.
      std::string status   = "Network found. Now proceedind variables instanciation...";
      int         progress = (int)((float)nbIte / (float)nbVar * 45) + 10;
      GUM_EMIT2(onProceed, progress, status);
      nbIte++;
    }
  }
 
  template < GUM_Numeric GUM_SCALAR >
 
 
  void BIFXMLBNReader< GUM_SCALAR >::_fillingBN_(XmlElement parentNetwork) {
    // Counting the number of variable for the signal
    int nbDef = 0;
    for (const auto& _: parentNetwork.children("DEFINITION")) {
      nbDef++;
    }
 
    // Iterating on definition nodes
    int nbIte = 0;
 
    for (const auto& currentVar: parentNetwork.children("DEFINITION")) {
      // Considered Node
      std::string currentVarName = currentVar.firstChildElement("FOR").textOrDefault("");
      NodeId      currentVarId   = _bn_->idFromName(currentVarName);
 
      // Get Node's parents
      List< NodeId > parentList;
 
      for (const auto& given: currentVar.children("GIVEN")) {
        std::string parentNode = given.textOrDefault("");
        NodeId      parentId   = _bn_->idFromName(parentNode);
        parentList.pushBack(parentId);
      }
 
      for (List< NodeId >::iterator_safe parentListIte = parentList.rbeginSafe();
           parentListIte != parentList.rendSafe();
           --parentListIte)
        _bn_->addArc(*parentListIte, currentVarId);
 
      // Recuperating tables values
      XmlElement              tableElement = currentVar.firstChildElement("TABLE");
      std::istringstream      issTableString(tableElement.textOrDefault(""));
      std::list< GUM_SCALAR > tablelist;
      GUM_SCALAR              value;
 
      while (!issTableString.eof()) {
        issTableString >> value;
        tablelist.push_back(value);
      }
 
      std::vector< GUM_SCALAR > tablevector(tablelist.begin(), tablelist.end());
 
      // Filling tables
      _bn_->cpt(currentVarId).fillWith(tablevector);
 
      // Emitting progress.
      std::string status   = "All variables have been instancied. Now filling up diagram...";
      int         progress = (int)((float)nbIte / (float)nbDef * 45) + 55;
      GUM_EMIT2(onProceed, progress, status);
      nbIte++;
    }
  }
} /* namespace gum */
 
#endif   // DOXYGEN_SHOULD_SKIP_THIS