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digest.c

/*      Copyright (C) 2001, 2002, 2003, 2004 Stijn van Dongen
 * * This file is part of Zoem. You can redistribute and/or modify Zoem under the
 * terms of the GNU General Public License;  either version 2 of the License or
 * (at your option) any later  version.  You should have received a copy of the
 * GPL along with Zoem, in the file COPYING.
*/

#include "digest.h"
#include "filter.h"
#include "parse.h"
#include "iface.h"
#include "segment.h"
#include "util.h"

#include "util/ting.h"

/*
 *    creates successively new segs, and these segs
 *    and their content will be freed. The input txt is left
 *    alone however, and is responsibility of caller.
*/

mcxstatus yamOutput
(  mcxTing       *txtin
,  sink*          sd
,  int            fltidx
)
   {  yamSeg   *seg
   ;  filter* fd = sd ? sd->fd : NULL

   ;  if (!txtin)
         yamErr("yamOutput PBD", "void argument")
      ,  mcxExit(1)

   ;  if (sd)
      sinkStackPush(sd)
   ;  seg = yamStackPush(txtin)

   ;  if (seg->flags & SEGMENT_ERROR)

   ;  else
      while(seg)
      {  int  prev_offset  =  seg->offset
      ;  yamSeg* prev_seg  =  seg
      ;  mcxbool dofilter  =  fltidx
      
      ;  int offset        =  yamFindKey(seg)
      ;  mcxbool done      =  offset == -1
      ;  mcxbool err       =  offset == -2
      ;  int len

      ;  if (err)
         break

      ;  if (done)
         offset = seg->txt->len
      
      ;  len = offset - prev_offset

      ;  if (tracing_g & ZOEM_TRACE_OUTPUT)
         fprintf
         (  stdout
         ,  "----.----. %s seg %d stack %d offset %d len %d txt len %d%s"
         ,  dofilter ? "filtering" : "skipping"
         ,  seg->idx
         ,  yamStackIdx()
         ,  prev_offset
         ,  len
         ,  seg->txt->len
         ,  dofilter && len ? "\n ...|" : "\n"
         )

      ;  if (len && dofilter && flts[fltidx](fd, seg->txt, prev_offset, len))
         break

      ;  if (seg && seg->flags & SEGMENT_INTERRUPT)
         break

      ;  if (tracing_g & ZOEM_TRACE_OUTPUT)
         fprintf
         (  stdout
         ,  "%s----^----^ output %s seg %d and stack %d\n"
         ,  dofilter && len ? "\n" : ""
         ,  done ? "finished" : "continuing"
         ,  seg->idx
         ,  yamStackIdx()
         )

      ;  if (done)
         {  seg  =  seg->prev
         ;  yamSegFree(&prev_seg)
      ;  }
         else
         {  yamSeg* newseg  = yamDoKey(seg)
         ;  if (newseg)
            seg = newseg
         ;  else
            {  seg->flags |= SEGMENT_ERROR
            ;  break
         ;  }
         }
      }

      if (sd)
      sinkStackPop()

   ;  if (seg)    /* thrown or error */
      {  mcxbool throw = seg->flags & SEGMENT_THROW
      ;  yamStackFree(&seg)
      ;  return throw ? STATUS_THROW : STATUS_FAIL
   ;  }

      return STATUS_OK
;  }


mcxstatus  yamDigest
(  mcxTing      *txtin
,  mcxTing      *txtout
,  yamSeg       *baseseg
)
   {  yamSeg     *seg
   ;  mcxbool     newscratch  =  txtin == txtout ? TRUE : FALSE
   ;  mcxbits     irupt = 0

   ;  mcxTing*    txt = newscratch ? NULL : txtout

   ;  if (!txtin)
         yamErr("yamDigest PBD", "void argument")
      ,  mcxExit(1)

   ;  if (txtin == txtout && !strchr(txtin->str, '\\'))
      return STATUS_OK

   ;  txt  =  mcxTingEmpty(txt, 30)

   ;  seg = yamStackPush(txtin)
   ;  seg->flags |=  SEGMENT_DIGEST

   ;  if (seg->flags & SEGMENT_ERROR)

   ;  else
      while(seg)
      {  int prev_offset   =  seg->offset
      ;  yamSeg* prev_seg  =  seg

      ;  int offset        =  yamFindKey(seg)
      ;  mcxbool done      =  offset == -1
      ;  mcxbool err       =  offset == -2
      ;  int len

      ;  if (err)
         break

      ;  if (done)
         offset = seg->txt->len

      ;  len = offset - prev_offset

      ;  if (tracing_g & ZOEM_TRACE_OUTPUT)
         fprintf
         (  stdout
         ,  "----.----. "
            "appending seg %d stack %d offset %d length %d text length %d%s"
         ,  seg->idx
         ,  yamStackIdx()
         ,  prev_offset
         ,  len
         ,  seg->txt->len
         ,  len ? "\n(dat(" : "\n"
         )

      ;  if (len)
         mcxTingNAppend
         (  txt
         ,  seg->txt->str+prev_offset
         ,  len
         )

      ;  if (seg && seg->flags & SEGMENT_INTERRUPT)
         break

      ;  if (tracing_g & ZOEM_TRACE_OUTPUT)
         {  if (len)
            traceputlines(seg->txt->str+prev_offset, len)
         ;  fprintf
            (  stdout
            ,  "----^----^ digest %s seg %d and stack %d\n"
            ,  done ? "finished" : "continuing"
            ,  seg->idx
            ,  yamStackIdx()
            )
      ;  }

         if (done)
         {  seg  =  seg->prev
         ;  yamSegFree(&prev_seg)
      ;  }
         else
         {  yamSeg* newseg  = yamDoKey(seg)
         ;  if (newseg)
            seg = newseg
         ;  else
            {  seg->flags |= SEGMENT_ERROR
            ;  break
         ;  }
         }
      }

      if (newscratch)
      {  mcxTingWrite(txtin, txt->str)
      ;  mcxTingFree(&txt)
   ;  }

      if (seg)    /* thrown or error */
      {  irupt = seg->flags & SEGMENT_INTERRUPT
      ;  if (baseseg)
         baseseg->flags |= irupt
      ;  yamStackFree(&seg)
   ;  }

      return irupt ? STATUS_FAIL : STATUS_OK
;  }



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