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Parse.cpp

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/*
Copyright (c) 2000-2003, Jelle Kok, University of Amsterdam
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.

3. Neither the name of the University of Amsterdam nor the names of its
contributors may be used to endorse or promote products derived from this
software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include "Parse.h"

#include <ctype.h>    // needed for isdigit
#include <math.h>     // needed for pow
#include <string.h>   // needed for strlen

/*****************************************************************************/
/********************** CLASS PARSE ******************************************/
/*****************************************************************************/

char Parse::gotoFirstNonSpace( char** strMsg )
{
  while(*strMsg && isspace(**strMsg) )
    (*strMsg)++;
  return  (*strMsg) ?  **strMsg : '\0';

}

char Parse::gotoFirstSpaceOrClosingBracket( char** strMsg )
{
  while( *strMsg && **strMsg!=' ' && **strMsg!=')' )
    (*strMsg)++;
  return  (*strMsg) ?  **strMsg : '\0';
}

int Parse::gotoFirstOccurenceOf( char c, char** strMsg )
{
  int i=0;
  while(**strMsg && **strMsg != c )
  {
    i++;
    (*strMsg)++;
  }
  if( ! **strMsg )
    return -1;
  return i;
}

int Parse::parseFirstInt( char** strMsg )
{
  int  iRes  = 0;
  bool bIsMin= false;
  char *str  = *strMsg;

  while( *str != '\0' && !isdigit(*str) && *str!='-')
    str++;                             // walk to first non digit or minus sign


  if( *str != '\0' && *str=='-')       // if it was a minus sign, remember
  {
    bIsMin=true;
    str++;
  }

  while( *str != '\0' && *str<='9' && *str>='0' )   // for all digits
  {
      iRes=iRes*10+(int)(*str-'0');                 // multiply old res with 10
      str++;                                        // and add new value
  }
  *strMsg = str;
  return (bIsMin) ? -iRes : iRes;
}

double Parse::parseFirstDouble( char** strMsg )
{
  double dRes=0.0, dFrac=1.0;
  bool bIsMin=false, bInDecimal=false, bCont=true;
  char *str = *strMsg;

  // go to first part of double (digit, minus sign or '.')
  while( *str != '\0' && !isdigit(*str) && *str!='-' && *str!='.')
  {
    // when NaN or nan is double value, return -1000.0
    if( (*str=='N' && strlen(str)>3 && *(str+1)=='a' && *(str+2)=='N') ||
        (*str=='n' && strlen(str)>3 && *(str+1)=='a' && *(str+2)=='n') )
    {
      *strMsg = str+3;
      return -1000.0;
    }
    else
       str++;
  }

  if( *str != '\0' && *str=='-')               // if minus sign, remember that
  {
    bIsMin=true;
    str++;
  }

  while( *str != '\0' && bCont)                // process the number bit by bit
  {
    if( *str=='.' )                            // in decimal part after '.'
      bInDecimal = true;
    else if( bInDecimal && *str<='9' && *str>='0') // number and in decimal
    {
      dFrac=dFrac*10.0;                        // shift decimal part to right
      dRes += (double)(*str-'0')/dFrac;        // and add number
    }
    else if( *str<='9' && *str>='0' )          // if number and not decimal
      dRes=dRes*10+(double)(*str-'0');         // shift left and add number
    else if( *str=='e' ) // 10.6e-08           // if to power e
    {
      if( *(str+1) == '+' )                    // determine sign
        dRes *=  pow(10, parseFirstInt(&str)); // and multiply with power
      else if( *(str+1) == '-' )
      {
        str = str+2;                           // skip -
        dRes /=  pow(10, parseFirstInt(&str)); // and divide by power
      }
      bCont = false;                           // after 'e' stop
    }
    else
      bCont = false;                           // all other cases stop

    if( bCont == true )                        // update when not stopped yet
      str++;
  }
  *strMsg = str;
  return (bIsMin && dRes != 0.0) ? -dRes : dRes;
}

/*****************************************************************************/
/********************* TESTING PURPOSES **************************************/
/*****************************************************************************/
/*
#include<iostream.h>

int main( void )
{
  double d = 13.6e+15;
  char str[] = "13.6e+15";
  double d2 = 13.6e-15;
  char str2[] = "13.6e-15";

  char *strmsg;
  strmsg = &str[0];
  cout  << d << endl;
  cout << Parse::parseFirstDouble( &strmsg )<< endl;
  strmsg = &str2[0];
  cout  << d2 << endl;
  cout << Parse::parseFirstDouble( &strmsg ) << endl;
  return 0;
}
*/

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