mpsinput.h

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/*                  This file is part of the class library                   */
/*       SoPlex --- the Sequential object-oriented simPlex.                  */
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/*  Copyright (c) 1996-2024 Zuse Institute Berlin (ZIB)                      */
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/**@file  mpsinput.h
 * @brief Read MPS format files.
 */
#ifndef _MPSINPUT_H_
#define _MPSINPUT_H_
 
#include <iostream>
 
#include "soplex/spxout.h"
 
namespace soplex
{
 
/**@class MPSInput
 
   Reads MPS input files. A right-hand side for the objective function is
   allowed but ignored.
 */
class MPSInput
{
public:
 
   //-----------------------------------
   /**@name Types */
   ///@{
   ///
 
   enum Section
   {
      NAME, OBJSEN, OBJNAME, ROWS, COLUMNS, RHS, RANGES, BOUNDS, ENDATA
   };
   ///
 
   /// optimization sense.
   enum Sense
   {
      MAXIMIZE = 1,
      MINIMIZE = -1
   };
 
   enum { MAX_LINE_LEN = 256 };
 
   ///@}
 
private:
 
   //-----------------------------------
   /**@name Private data */
   ///@{
   ///
   Section         m_section;
   /// the input stream from which the file is read
   std::istream&   m_input;
   /// line number
   int             m_lineno;
   /// objctive sense (maximization or minimization)
   Sense           m_objsense;
   /// is set to \c true upon a syntax error
   bool            m_has_error;
   /// the line buffer
   char            m_buf[MAX_LINE_LEN];
   /// first field in a line
   const char*     m_f0;
   /// second field in a line
   const char*     m_f1;
   /// third field in a line
   const char*     m_f2;
   /// fourth field in a line
   const char*     m_f3;
   /// fifth field in a line
   const char*     m_f4;
   /// sixth field in a line
   const char*     m_f5;
   /// problem name
   char            m_probname[MAX_LINE_LEN];
   /// objective name
   char            m_objname [MAX_LINE_LEN];
   ///
   bool            m_is_integer;
   /// new MPS format?
   bool            m_is_new_format;
   /// Number of already ignored entries.
   int             m_ignored;
   /// Maximal number of ignored entries for which a warning will be issued.
   static const int m_max_ignore = 1000;
   ///@}
 
public:
 
   //-----------------------------------
   /**@name Construction / destruction */
   ///@{
   ///
   explicit
   MPSInput(std::istream& p_input)
      : m_section(NAME)
      , m_input(p_input)
      , m_lineno(0)
      , m_objsense(MPSInput::MINIMIZE)
      , m_has_error(false)
      , m_is_integer(false)
      , m_is_new_format(false)
      , m_ignored(0)
   {
      m_f0 = m_f1 = m_f2 = m_f3 = m_f4 = m_f5 = nullptr;
 
      m_buf     [0] = '\0';
      m_probname[0] = '\0';
      m_objname [0] = '\0';
   }
   ///
   virtual
   ~MPSInput()
   {
      // only to signal to flexelint that the pointers do
      // not point to anything that has to be freed.
      m_f0 = m_f1 = m_f2 = m_f3 = m_f4 = m_f5 = nullptr;
   }
   ///@}
 
   //-----------------------------------
   /**@name Access */
   ///@{
   ///
   Section         section()   const
   {
      return m_section;
   }
   ///
   int             lineno()    const
   {
      return m_lineno;
   }
   ///
   const char*     field0()    const
   {
      return m_f0;
   }
   ///
   const char*     field1()    const
   {
      return m_f1;
   }
   ///
   const char*     field2()    const
   {
      return m_f2;
   }
   ///
   const char*     field3()    const
   {
      return m_f3;
   }
   ///
   const char*     field4()    const
   {
      return m_f4;
   }
   ///
   const char*     field5()    const
   {
      return m_f5;
   }
   ///
   const char*     probName()  const
   {
      return m_probname;
   }
   ///
   const char*     objName()   const
   {
      return m_objname;
   }
   ///
   Sense           objSense()  const
   {
      return m_objsense;
   }
   ///
   bool            hasError()  const
   {
      return m_has_error;
   }
   ///
   bool            isInteger() const
   {
      return m_is_integer;
   }
   ///@}
 
   //-----------------------------------
   /**@name Modification */
   ///@{
   ///
   void setSection(Section p_section)
   {
      m_section = p_section;
   }
   ///
   void setProbName(const char* p_probname)
   {
      assert(strlen(p_probname) < MAX_LINE_LEN);
      spxSnprintf(m_probname, MAX_LINE_LEN, "%s", p_probname);
   }
   ///
   void setObjName(const char* p_objname)
   {
      assert(strlen(p_objname) < MAX_LINE_LEN);
      spxSnprintf(m_objname, MAX_LINE_LEN, "%s", p_objname);
   }
   ///
   void setObjSense(Sense sense)
   {
      m_objsense = sense;
   }
   ///@}
 
   //-----------------------------------
   /**@name Warnings and Errors */
   ///@{
   ///
   void syntaxError()
   {
      SPX_MSG_ERROR(std::cerr << "Syntax error in line " << m_lineno << std::endl;)
      m_section = ENDATA;
      m_has_error = true;
   }
   ///
   void entryIgnored(
      const char* what, const char* what_name,
      const char* entity, const char* entity_name)
   {
      if(m_ignored < m_max_ignore)
      {
         SPX_MSG_ERROR(std::cerr << "Warning: line " << m_lineno << ": "
                       << what << " \"" << what_name << "\""
                       << " for " << entity << " \""
                       << entity_name << "\" ignored" << std::endl;)
         ++m_ignored;
 
         if(m_ignored == m_max_ignore)
            SPX_MSG_ERROR(std::cerr << "Warning: This was the " << m_max_ignore
                          << " ignored entry. No further warnings on "
                          << "ignored entries will be given." << std::endl;)
         }
   }
   ///@}
 
   //-----------------------------------
   /**@name Helpers */
   ///@{
   /// reads an MPS format data line and parse the fields.
   bool readLine();
   /// Inserts \p name as field 1 and shifts all other fields up.
   void insertName(const char* name,
                   bool second = false);
   ///@}
};
} // namespace soplex
#endif // _MPSINPUT_H_