source: orxonox.OLD/trunk/src/lib/util/ini_parser.cc @ 5939

/*
   orxonox - the future of 3D-vertical-scrollers

   Copyright (C) 2004 orx

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   ### File Specific:
   main-programmer: Benjamin Grauer
   co-programmer: Christian Meyer

   2005-08-14: complete reimplementation:
               now the File is parsed at the initialisation,
               and informations is gathered there.
*/


#include "ini_parser.h"

#include <stdlib.h>
#include <string.h>

#if HAVE_CONFIG_H 
#include <config.h> 
#endif

#ifdef DEBUG
 #include "debug.h"
#else
 #define PRINTF(x) printf
#endif

using namespace std;

/**
 * @brief constructs an IniParser using a file
 * @param fileName: the path and name of the file to parse
 */
IniParser::IniParser (const char* fileName)
{
  this->fileName = NULL;


  if (fileName != NULL)
    this->readFile(fileName);
}


/**
 * @brief removes the IniParser from memory
 */
IniParser::~IniParser ()
{
  this->deleteSections();
}


/**
 * @brief removes all the sections. This is like delete, but even cooler :)
 */
void IniParser::deleteSections()
{
  // in all sections
  while(!this->sections.empty())
  {
     IniSection section = this->sections.front();
    
    // in all entries of the sections
    while(!section.entries.empty())
    {
      // delete all strings of entries.
      IniEntry entry = section.entries.front();
      delete []entry.name;
      delete []entry.value;
      section.entries.pop_front();
    }
    // delete all Sections
    delete []section.name;
    this->sections.pop_front();
  }
  this->currentSection = this->sections.end();
  this->setFileName(NULL);
}


/**
 * @brief sets the Name of the input-file
 * @param fileName The new FileName to set to the IniParser
 * If fileName is NULL the new Name will be set to NULL too.
 */
void IniParser::setFileName(const char* fileName)
{
  if (this->fileName)
    delete []this->fileName;
  if (fileName != NULL)
  {
    this->fileName = new char[strlen(fileName)+1];
    strcpy(this->fileName, fileName);
  }
  else
    this->fileName = NULL;
}


/**
 * @brief opens a file to parse 
 * @param fileName: path and name of the new file to parse
 * @return true on success false otherwise;
 *
 * If there was already an opened file, the file will be closed,
 * and the new one will be opened.
 */
bool IniParser::readFile(const char* fileName)
{
  FILE*    stream;           //< The stream we use to read the file.

  if (this->fileName != NULL)
    this->deleteSections();
  if( fileName == NULL)
    return false;

  if( (stream = fopen (fileName, "r")) == NULL)
  {
    PRINTF(1)("IniParser could not open %s\n", fileName);
    return false;
  }
  else
  {
    this->setFileName(fileName);

    /////////////////////////////
    // READING IN THE INI-FILE //
    /////////////////////////////
    char lineBuffer[PARSELINELENGHT];
    char buffer[PARSELINELENGHT];
    const char* lineBegin;
    char* ptr;

    while( fgets (lineBuffer, PARSELINELENGHT, stream))
    {
      lineBegin = lineBuffer;
      // remove newline char, and \0-terminate
      if( (ptr = strchr( lineBuffer, '\n')) != NULL)
        *ptr = 0;
      // cut up to the beginning of the line.
      while((*lineBegin == ' ' || *lineBegin == '\t') && lineBegin < lineBuffer + strlen(lineBuffer))
        ++lineBegin;
      if (strlen(lineBegin) <= 1 || *lineBegin == '#' || *lineBegin == ';')
        continue;//printf("empty Line\n");
      // check for section identifyer
      else if( sscanf (lineBegin, "[%s", buffer) == 1)
      {
        if( (ptr = strchr( buffer, ']')) != NULL)
        {
          *ptr = 0;
          this->addSection(buffer);
        }
      }
      // check for Entry identifier (Entry = Value)
      else if( (ptr = strchr( lineBegin, '=')) != NULL)
      {
        if (currentSection == NULL)
        {
          PRINTF(2)("Not in a Section yet for %s\n", lineBegin);
          continue;
        }
        if( ptr == lineBegin)
          continue;
        char* valueBegin = ptr+1;
        while ((*valueBegin == ' ' || *valueBegin == '\t') && valueBegin <= lineBegin + strlen(lineBegin))
          ++valueBegin;
        char* valueEnd = valueBegin + strlen(valueBegin)-1;
        while ((*valueEnd == ' ' || *valueEnd == '\t') && valueEnd >= valueBegin)
          --valueEnd;
        valueEnd[1] = '\0';
        char* nameEnd = ptr-1;
        while ((*nameEnd == ' ' || *nameEnd == '\t' ) && nameEnd >= lineBegin)
          --nameEnd;
        nameEnd[1] = '\0';

        this->addVar(lineBegin, valueBegin);
      }
    }
  }
  this->currentSection = this->sections.begin();
  if (!this->sections.empty())
    this->currentEntry = (*this->currentSection).entries.begin();

  fclose(stream);
  return true;
}


/**
 * @brief opens a file and writes to it
 * @param fileName: path and name of the new file to write to
 * @return true on success false otherwise
 */
bool IniParser::writeFile(const char* fileName) const
{
  FILE*    stream;           //!< The stream we use to read the file.
  if( fileName == NULL)
    return false;

  if( (stream = fopen (fileName, "w")) == NULL)
  {
    PRINTF(1)("IniParser could not open %s\n", fileName);
    return false;
  }
  else
  {
    std::list<IniSection>::const_iterator section;
    for (section = this->sections.begin(); section != this->sections.end(); section++)
      {
        fprintf(stream, "\n [%s]\n", (*section).name);
        
        std::list<IniEntry>::const_iterator entry;
        for (entry = (*section).entries.begin(); entry != (*section).entries.end(); entry++)
          fprintf(stream, "   %s = %s\n", (*entry).name, (*entry).value);
      }
  }
  fclose(stream);
}


/**
 * @brief adds a section to the list of Sections,
 * if no Section list is availiable, it will create it
 * @param sectionName the Name of the section to add
 * @return true on success... there is only success or segfault :)
 */
bool IniParser::addSection(const char* sectionName)
{
  this->sections.push_back(IniSection());

  this->sections.back().name = new char[strlen(sectionName)+1];
  strcpy(this->sections.back().name, sectionName);

  this->currentSection = --this->sections.end();
  if (!this->sections.empty())
      this->currentEntry = (*this->currentSection).entries.begin();
  PRINTF(5)("Added Section %s\n", sectionName);
  return true;
}


/**
 * @brief Set the parsing cursor to the specified section
 * @param sectionName: the name of the section to set the cursor to
 * @return true on success or false if the section could not be found
 */
bool IniParser::getSection(const char* sectionName)
{
  std::list<IniSection>::iterator section;
  for (section = this->sections.begin(); section != this->sections.end(); section++)
    if (!strcmp((*section).name, sectionName))
      {
        this->currentSection = section;
        this->currentEntry = (*this->currentSection).entries.begin();
        return true;
      }
  return false;
}


/**
 * @brief moves to the first section
 */
void IniParser::firstSection()
{
  this->currentSection = this->sections.begin();
  if (!this->sections.empty())
    this->currentEntry = (*this->currentSection).entries.begin();
}


/**
 * @brief searches the next section
 * @returns the name of the section if found, NULL otherwise
 */
const char* IniParser::nextSection()
{
  if (this->currentSection == this->sections.end())
    return NULL;

  this->currentSection++;

  if (this->currentSection != this->sections.end())
    {
      this->currentEntry = (*this->currentSection).entries.begin();
      return this->currentSection->name;
    }
  else
    return NULL;
}


/**
 * @brief moves to the first Variable of the current Section
 */
void IniParser::firstVar()
{
  if (!this->sections.empty() &&
      this->currentSection != this->sections.end())
    this->currentEntry = (*this->currentSection).entries.begin();
}


/**
 * @brief gets the next VarName = VarValue pair from the parsing stream
 * @return true on success, false otherwise (in the latter case name and value will be NULL)
 */
bool IniParser::nextVar()
{
  if ( this->sections.empty() 
       || this->currentSection == this->sections.end()
       || this->currentEntry == (*this->currentSection).entries.end())
    return false;

  this->currentEntry++;

  if (this->currentEntry == (*this->currentSection).entries.end())
    return false;
  else
    return true;
}


/**
 * @brief adds a new Entry to either the currentSection or the section called by sectionName
 * @param entryName the Name of the Entry to add
 * @param value the value to assign to this entry
 * @param sectionName if NULL then this entry will be set to the currentSection
 * otherwise to the section refered to by sectionName.
 * If both are NULL no entry will be added
 * @return true if everything is ok false on error
 */
bool IniParser::addVar(const char* entryName, const char* value, const char* sectionName)
{
  std::list<IniSection>::iterator section;
  
  if (sectionName != NULL)
  {
    for (section = this->sections.begin(); section != this->sections.end(); section++)
      if (!strcmp((*section).name, sectionName))
        break;
  }
  else
    section = this->currentSection;
  if (section == this->sections.end())
    return false;

  if (section == this->sections.end())
  {
    PRINTF(2)("section '%s' not found for value '%s'\n", sectionName, entryName);
    return false;
  }
  else
  {
    (*section).entries.push_back(IniEntry());
    (*section).entries.back().name = new char[strlen(entryName)+1];
    strcpy((*section).entries.back().name, entryName);
    (*section).entries.back().value = new char[strlen(value)+1];
    strcpy((*section).entries.back().value, value);
    PRINTF(5)("Added Entry %s with Value '%s' to Section %s\n",
              (*section).entries.back().name,
              (*section).entries.back().value,
              (*section).name);
    return true;
  }
}


/**
 * @brief directly acesses an entry in a section
 * @param entryName: the name of the entry to find
 * @param sectionName: the section where the entry is to be found
 * @param defaultValue: what should be returned in case the entry cannot be found
 * @return a pointer to a buffer conatining the value of the specified entry. This buffer will contain the data specified in defvalue in case the entry wasn't found
 *
 *  The returned pointer points to an internal buffer, so do not free it on your own. Do not give a NULL pointer to defvalue, this will certainly
 * lead to unwanted behaviour.
*/
const char* IniParser::getVar(const char* entryName, const char* sectionName, const char* defaultValue) const
{
  if (fileName != NULL)
  {
    std::list<IniSection>::const_iterator section;
    if (sectionName != NULL)
      {
        for (section = this->sections.begin(); section != this->sections.end(); section++)
          {
            if (!strcmp((*section).name, sectionName))
              {
                break;
              }
          }
        PRINTF(2)("Section %s that should be containing %s not found.\n", sectionName, entryName);
      }
    else
      section = this->currentSection;
    
   if (section == this->sections.end())
     return (defaultValue);

    std::list<IniEntry>::const_iterator entry;
    for (entry = (*section).entries.begin(); entry != (*section).entries.end(); entry++)
      if (!strcmp((*entry).name, entryName))
        return (*entry).value;
    PRINTF(2)("Entry '%s' in section '%s' not found.\n", entryName, sectionName);
   
  }
  else
    PRINTF(2)("%s not opened\n", fileName);

  return defaultValue;

}


/**
 * @returns the name of the Current selected Section 
 */
const char* IniParser::getCurrentSection() const 
{
  if (!this->sections.empty() &&
      this->currentSection != this->sections.end()) 
    return this->currentSection->name;
  else
    return NULL;
 }


/** 
 * @returns the current entries Name, or NULL if we havn't selected a Entry 
 */
const char* IniParser::getCurrentName() const
{
 if (!this->sections.empty() &&
     this->currentSection != this->sections.end() &&
     this->currentEntry != (*this->currentSection).entries.end())
   return (*this->currentEntry).name;
 else
   return NULL;
}

/**
 * @returns the current entries Value, or NULL if we havn't selected a Entry 
 */
const char* IniParser::getCurrentValue() const 
{
  if (!this->sections.empty() &&
      this->currentSection != this->sections.end() &&
      this->currentEntry != (*this->currentSection).entries.end())
    return (*this->currentEntry).value;
  else
    return NULL; 
}


/**
 * @brief output the whole tree in a nice and easy way.
 */
void IniParser::debug() const
{
  PRINTF(0)("Iniparser %s - debug\n", this->fileName);
  if (this->fileName != NULL)
  {
    std::list<IniSection>::const_iterator section;
    for (section = this->sections.begin(); section != this->sections.end(); section++)
    {
      PRINTF(0)(" [%s]\n", (*section).name);

      std::list<IniEntry>::const_iterator entry;
      for (entry = (*section).entries.begin(); entry != (*section).entries.end(); entry++)
        PRINTF(0)("   '%s' -> '%s'\n", (*entry).name, (*entry).value);
    }
  }
  else
    PRINTF(1)("no opened ini-file.\n");
}