/*****************************************************************************
#   Copyright (C) 1994-2008 by David Gordon.
#   All rights reserved.                           
#                                                                           
#   This software is part of a beta-test version of the Consed/Autofinish
#   package.  It should not be redistributed or
#   used for any commercial purpose, including commercially funded
#   sequencing, without written permission from the author and the
#   University of Washington.
#   
#   This software is provided ``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 authors or the University of Washington 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.
#
#   Building Consed from source is error prone and not simple which is
#   why I provide executables.  Due to time limitations I cannot
#   provide any assistance in building Consed.  Even if you do not
#   modify the source, you may introduce errors due to using a
#   different version of the compiler, a different version of motif,
#   different versions of other libraries than I used, etc.  For this
#   reason, if you discover Consed bugs, I can only offer help with
#   those bugs if you first reproduce those bugs with an executable
#   provided by me--not an executable you have built.
# 
#   Modifying Consed is also difficult.  Although Consed is modular,
#   some modules are used by many other modules.  Thus making a change
#   in one place can have unforeseen effects on many other features.
#   It may takes months for you to notice these other side-effects
#   which may not seen connected at all.  It is not feasable for me to
#   provide help with modifying Consed sources because of the
#   potentially huge amount of time involved.
#
#*****************************************************************************/
#include    "bIsNumericFloat.h"
#include    "rwcstring.h"
#include    "rwcregexp.h"
#include    <stdio.h>
#include    <stdlib.h>



// Number of form 42. or 42.3 or 42
static RWCRegexp reg1( "^[+-]?[0-9]+[\\.]?[0-9]*$" );
// Number of form .3  with no digit before decimal point
static RWCRegexp reg2( "^[+-]?\\.[0-9]+$" );
// Number of form -2.3e-25
// or 6e-06 (no decimal point)
static RWCRegexp reg3( "^[+-]?[0-9]+[\\.]?[0-9]*[Ee][+-][0-9]+$" );


bool bIsNumericFloat( const RWCString& soNumber, float& fConvertedNumber ) {

   // chop off the leading and trailing whitespace

   RWCString soNumberLocalCopy = soNumber;
   soNumberLocalCopy.stripWhitespace( RWCString::BOTH );


   // match white space followed by +/- (maybe) followed by
   // numbers followed by white space
   // must handle the following cases:
   //   .59
   // 42.
   // 42.3
   // as well as leading signs
   // However the following should be excluded:
   // . or -. or +.


   if ( soNumberLocalCopy.index( reg1 ) == RW_NPOS ) {
      
      // See if it could be of form .3

      if ( soNumberLocalCopy.index( reg2 ) ) {

         // See if it could be of form -2.3e-25

         if ( soNumberLocalCopy.index( reg3 ) ) {
            // give up
            return( false );
         }
      }
   }

   fConvertedNumber = atof( soNumberLocalCopy.data() );
   return( true );
}