Recognize Forth 2012 number syntax

[pforth] / csrc / pf_words.c

/* @(#) pf_words.c 96/12/18 1.10 */
/***************************************************************
** Forth words for PForth based on 'C'
**
** Author: Phil Burk
** Copyright 1994 3DO, Phil Burk, Larry Polansky, David Rosenboom
**
** The pForth software code is dedicated to the public domain,
** and any third party may reproduce, distribute and modify
** the pForth software code or any derivative works thereof
** without any compensation or license.  The pForth software
** code is provided on an "as is" basis without any warranty
** of any kind, including, without limitation, the implied
** warranties of merchantability and fitness for a particular
** purpose and their equivalents under the laws of any jurisdiction.
**
**
**  941031  rdg     fix ffScan() to look for CRs and LFs
**
***************************************************************/

#include "pf_all.h"


/***************************************************************
** Print number in current base to output stream.
** This version does not handle double precision.
*/
void ffDot( cell_t n )
{
   MSG( ConvertNumberToText( n, gVarBase, TRUE, 1 ) );
   EMIT(' ');
}

/***************************************************************
** Print number in current base to output stream.
** This version does not handle double precision.
*/
void ffDotHex( cell_t n )
{
   MSG( ConvertNumberToText( n, 16, FALSE, 1 ) );
   EMIT(' ');
}

/* ( ... --- ... , print stack ) */
void ffDotS( void )
{
   cell_t *sp;
   cell_t i, Depth;

   MSG("Stack<");
   MSG( ConvertNumberToText( gVarBase, 10, TRUE, 1 ) ); /* Print base in decimal. */
   MSG("> ");

   Depth = gCurrentTask->td_StackBase - gCurrentTask->td_StackPtr;
   sp = gCurrentTask->td_StackBase;

   if( Depth < 0 )
   {
       MSG("UNDERFLOW!");
   }
   else
   {
       for( i=0; i<Depth; i++ )
       {
/* Print as unsigned if not base 10. */
           MSG( ConvertNumberToText( *(--sp), gVarBase, (gVarBase == 10), 1 ) );
           EMIT(' ');
       }
   }
   MSG("\n");
}

/* ( addr cnt char -- addr' cnt' , skip leading characters ) */
cell_t ffSkip( char *AddrIn, cell_t Cnt, char c, char **AddrOut )
{
   char *s;

   s = AddrIn;

   if( c == BLANK )
   {
       while( ( Cnt > 0 ) &&
           (( *s == BLANK) || ( *s == '\t')) )
       {
DBUGX(("ffSkip BLANK: %c, %d\n", *s, Cnt ));
           s++;
           Cnt--;
       }
   }
   else
   {
       while(( Cnt > 0 ) && ( *s == c ))
       {
DBUGX(("ffSkip: %c=0x%x, %d\n", *s, Cnt ));
       s++;
       Cnt--;
       }
   }
   *AddrOut = s;
   return Cnt;
}

/* ( addr cnt char -- addr' cnt' , scan for char ) */
cell_t ffScan( char *AddrIn, cell_t Cnt, char c, char **AddrOut )
{
   char *s;

   s = AddrIn;

   if( c == BLANK )
   {
       while(( Cnt > 0 ) &&
           ( *s != BLANK) &&
           ( *s != '\r') &&
           ( *s != '\n') &&
           ( *s != '\t'))
       {
DBUGX(("ffScan BLANK: %c, %d\n", *s, Cnt ));
           s++;
           Cnt--;
       }
   }
   else
   {
       while(( Cnt > 0 ) && ( *s != c ))
       {
DBUGX(("ffScan: %c, %d\n", *s, Cnt ));
           s++;
           Cnt--;
       }
   }
   *AddrOut = s;
   return Cnt;
}

/***************************************************************
** Forth equivalent 'C' functions.
***************************************************************/

/* Convert a single digit to the corresponding hex number. */
static cell_t HexDigitToNumber( char c )
{
   if( (c >= '0') && (c <= '9') )
   {
       return( c - '0' );
   }
   else if ( (c >= 'A') && (c <= 'F') )
   {
       return( c - 'A' + 0x0A );
   }
   else
   {
       return -1;
   }
}

/* Convert a string to the corresponding number using BASE. */
cell_t ffNumberQ( const char *FWord, cell_t *Num )
{
   cell_t Len, i, Accum=0, n, Sign=1, Base=gVarBase;
   const char *s;

/* get count */
   Len = *FWord++;
   s = FWord;

   switch (*s) {
   case '#': Base = 10; s++; Len--; break;
   case '$': Base = 16; s++; Len--; break;
   case '%': Base =  2; s++; Len--; break;
   case '\'':
       if( Len == 3 && s[2] == '\'' )
       {
           *Num = s[1];
           return NUM_TYPE_SINGLE;
       }
   }

/* process initial minus sign */
   if( *s == '-' )
   {
       Sign = -1;
       s++;
       Len--;
   }

   for( i=0; i<Len; i++)
   {
       n = HexDigitToNumber( *s++ );
       if( (n < 0) || (n >= Base) )
       {
           return NUM_TYPE_BAD;
       }

       Accum = (Accum * Base) + n;
   }
   *Num = Accum * Sign;
   return NUM_TYPE_SINGLE;
}

/***************************************************************
** Compiler Support
***************************************************************/

/* ( char -- c-addr , parse word ) */
char * ffWord( char c )
{
   char *s1,*s2,*s3;
   cell_t n1, n2, n3;
   cell_t i, nc;

   s1 = gCurrentTask->td_SourcePtr + gCurrentTask->td_IN;
   n1 = gCurrentTask->td_SourceNum - gCurrentTask->td_IN;
   n2 = ffSkip( s1, n1, c, &s2 );
DBUGX(("ffWord: s2=%c, %d\n", *s2, n2 ));
   n3 = ffScan( s2, n2, c, &s3 );
DBUGX(("ffWord: s3=%c, %d\n", *s3, n3 ));
   nc = n2-n3;
   if (nc > 0)
   {
       gScratch[0] = (char) nc;
       for( i=0; i<nc; i++ )
       {
           gScratch[i+1] = s2[i];
       }
   }
   else
   {

       gScratch[0] = 0;
   }
   gCurrentTask->td_IN += (n1-n3) + 1;
   return &gScratch[0];
}