source: trunk/src/riched32/text-writer.c@ 3515

/*
 * text-writer -- RTF-to-text translation writer code.
 *
 * Read RTF input, write text of document (text extraction).
 *
 * Wrapper must call WriterInit() once before processing any files,
 * then set up input and call BeginFile() for each input file.
 *
 * This installs callbacks for the text and control token classes.
 * The control class is necessary so that special characters such as
 * \par, \tab, \sect, etc.  can be converted.
 *
 * It's problematic what to do with text in headers and footers, and
 * what to do about tables.
 *
 * This really is quite a stupid program, for instance, it could keep
 * track of the current leader character and dump that out when a tab
 * is encountered.
 *
 * 04 Feb 91    Paul DuBois     dubois@primate.wisc.edu
 *
 * This software may be redistributed without restriction and used for
 * any purpose whatsoever.
 *
 * 04 Feb 91
 * -Created.
 * 27 Feb 91
 * - Updated for distribution 1.05.
 * 13 Jul 93
 * - Updated to compile under THINK C 6.0.
 * 31 Aug 93
 * - Added Mike Sendall's entries for Macintosh char map.
 * 07 Sep 93
 * - Uses charset map and output sequence map for character translation.
 * 11 Mar 94
 * - Updated for 1.10 distribution.
 */

# include       <stdio.h>

# include       "rtf.h"
# include       "rtf2text.h"
# include       "charlist.h"

static void     TextClass ();
static void     ControlClass ();
static void     Destination ();
static void     SpecialChar ();
static void     PutStdChar ();
static void     PutLitChar ();
static void     PutLitStr ();

static char     *outMap[rtfSC_MaxChar];

static CHARLIST charlist = {0, NULL, NULL};

int RTFToBuffer(char* pBuffer, int nBufferSize);
int RTFToBuffer(char* pBuffer, int nBufferSize)
{
    
   /* check if the buffer is big enough to hold all characters  */    
   /* we require one more for the '\0'                          */
   
   
   if(nBufferSize < charlist.nCount + 1) {
        return charlist.nCount + CHARLIST_CountChar(&charlist, '\n') + 1;
   }
  
   while(charlist.nCount)
   {
       *pBuffer = CHARLIST_Dequeue(&charlist);
       if(*pBuffer=='\n')
       {
         *pBuffer = '\r';
         pBuffer++;
         *pBuffer = '\n'; 
       }
       pBuffer++;
   }
   *pBuffer = '\0';

   return 0;    
}


/*
 * Initialize the writer.
 */

void
WriterInit ()
{
        RTFReadOutputMap (outMap,1);
}


int
BeginFile ()
{
        /* install class callbacks */

        RTFSetClassCallback (rtfText, TextClass);
        RTFSetClassCallback (rtfControl, ControlClass);

        return (1);
}


/*
 * Write out a character.  rtfMajor contains the input character, rtfMinor
 * contains the corresponding standard character code.
 *
 * If the input character isn't in the charset map, try to print some
 * representation of it.
 */

static void
TextClass ()
{
char    buf[rtfBufSiz];

        if (rtfMinor != rtfSC_nothing)
                PutStdChar (rtfMinor);
        else
        {
                if (rtfMajor < 128)     /* in ASCII range */
                        sprintf (buf, "[[%c]]", rtfMajor);
                else
                        sprintf (buf, "[[\\'%02x]]", rtfMajor);
                PutLitStr (buf);
        }
}


static void
ControlClass ()
{
        switch (rtfMajor)
        {
        case rtfDestination:
                Destination ();
                break;
        case rtfSpecialChar:
                SpecialChar ();
                break;
        }
}


/*
 * This function notices destinations that should be ignored
 * and skips to their ends.  This keeps, for instance, picture
 * data from being considered as plain text.
 */

static void
Destination ()
{
        switch (rtfMinor)
        {
        case rtfPict:
        case rtfFNContSep:
        case rtfFNContNotice:
        case rtfInfo:
        case rtfIndexRange:
        case rtfITitle:
        case rtfISubject:
        case rtfIAuthor:
        case rtfIOperator:
        case rtfIKeywords:
        case rtfIComment:
        case rtfIVersion:
        case rtfIDoccomm:
                RTFSkipGroup ();
                break;
        }
}


/*
 * The reason these use the rtfSC_xxx thingies instead of just writing
 * out ' ', '-', '"', etc., is so that the mapping for these characters
 * can be controlled by the text-map file.
 */

void SpecialChar ()
{
        switch (rtfMinor)
        {
        case rtfPage:
        case rtfSect:
        case rtfRow:
        case rtfLine:
        case rtfPar:
                PutLitChar ('\n');
                break;
        case rtfCell:
                PutStdChar (rtfSC_space);       /* make sure cells are separated */
                break;
        case rtfNoBrkSpace:
                PutStdChar (rtfSC_nobrkspace);
                break;
        case rtfTab:
                PutLitChar ('\t');
                break;
        case rtfNoBrkHyphen:
                PutStdChar (rtfSC_nobrkhyphen);
                break;
        case rtfBullet:
                PutStdChar (rtfSC_bullet);
                break;
        case rtfEmDash:
                PutStdChar (rtfSC_emdash);
                break;
        case rtfEnDash:
                PutStdChar (rtfSC_endash);
                break;
        case rtfLQuote:
                PutStdChar (rtfSC_quoteleft);
                break;
        case rtfRQuote:
                PutStdChar (rtfSC_quoteright);
                break;
        case rtfLDblQuote:
                PutStdChar (rtfSC_quotedblleft);
                break;
        case rtfRDblQuote:
                PutStdChar (rtfSC_quotedblright);
                break;
        }
}


/*
 * Eventually this should keep track of the destination of the
 * current state and only write text when in the initial state.
 *
 * If the output sequence is unspecified in the output map, write
 * the character's standard name instead.  This makes map deficiencies
 * obvious and provides incentive to fix it. :-)
 */

void PutStdChar (int stdCode)
{
  
  char  *oStr = (char *) NULL;
  char  buf[rtfBufSiz];
  
/*      if (stdCode == rtfSC_nothing)
                RTFPanic ("Unknown character code, logic error\n");
*/              
        oStr = outMap[stdCode];
        if (oStr == (char *) NULL)      /* no output sequence in map */
        {
                sprintf (buf, "[[%s]]", RTFStdCharName (stdCode));
                oStr = buf;
        }
        PutLitStr (oStr);
}


void PutLitChar (int c)
{
        CHARLIST_Enqueue(&charlist, (char) c);
        /* fputc (c, ostream); */
}


static void PutLitStr (char     *s)
{
        for(;*s;s++)
        {
          CHARLIST_Enqueue(&charlist, *s);
        }
        /* fputs (s, ostream); */
}