Subversion Repositories wimsdev

/*    Copyright (C) 1998-2003 XIAO, Gang of Universite de Nice - Sophia Antipolis

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; either version 2 of the License, or

 *  (at your option) any later version.

 *

 *  This program is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *  GNU General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program; if not, write to the Free Software

 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 */

/* Check type of a file */

/*************** Customization: change values hereafter ****************/

/* limit of data buffers */

#define buflim 1024*1024*16

/***************** Nothing should need change hereafter *****************/

#include "../Lib/libwims.h"

#define hmsame "\\CC\\Delta\\Gamma\\Lambda\\NN\\Omega\\Phi\\Pi\\Psi\\QQ\\RR\\Sigma\\Xi\\ZZ\\alpha\\beta\\cap\\chi\\cup\\delta\\div\\eta\\exists\\forall\\gamma\\in\\infty\\iota\\kappa\\lambda\\mu\\nabla\\nu\\omega\\pi\\pm\\psi\\rho\\sigma\\subset\\subseteq\\tau\\theta\\times\\varepsilon\\varphi\\xi\\zeta\\"

char fn1[1024]="", fn2[1024]="";

char mathbuf[MAX_LINELEN+1];

char *filebuf;

int filelen=0;

int latex2html=0;

FILE *outf;

struct {

    char *name, *trans;

} backtrans[]={

    {"\\ge\\", " >= "},

    {"\\geq\\", " >= "},

    {"\\le\\", " <= "},

    {"\\leq\\", " <= "},

    {"\\to\\", " -> "},

    {"\\rightarrow\\", " -> "},

    {"\\longrightarrow\\", " --> "},

    {"\\Rightarrow\\", " => "},

    {"\\Longrightarrow\\", " ==> "},

    {"\\Leftrightarrow\\", " <=> "},

    {"\\Longleftrightarrow\\", " <==> "},

    {"\\Longleftarrow\\", " <== "},

};

#define backtransno (sizeof(backtrans)/sizeof(backtrans[0]))

char *find_tag_end(char *p)

{

  char *pp, *old;

  pp=p; if(*pp=='<') pp++;

  for(; *pp && *pp!='>'; pp++) {

    if(*pp=='"') {

      pp=strchr(pp+1,'"');

      if(pp==NULL) {pp=p+strlen(p); break;} else continue;

    }

  }

/* this is probably an syntax error of the page */

  if(*pp==0 && pp>p+2048) {

    old=p; if(*old=='<') old++;

    pp=strchr(old,'>');

    if(pp==NULL) pp=strchr(old,'<');

    if(pp==NULL) pp=find_word_end(find_word_start(old));

  }

  if(*pp=='>') pp++;

  return pp;

}

char *find_tag(char *p, char *tag)

{

  char *pp;

  int len;

  len=strlen(tag);

  for(pp=strchr(p,'<'); pp!=NULL && *pp; pp=strchr(pp+1,'<')) {

    if(strncasecmp(pp+1,tag,len)==0 && !isalnum(*(pp+1+len))) return pp;

  }

  return p+strlen(p);

}

void cutamp(char *p)

{

  char *pp;

  for(pp=strchr(p,'&'); pp; pp=strchr(pp+1,'&')) {

    if(strncmp(pp,"&",5)==0) {

      ovlstrcpy(pp+1,pp+5); continue;

    }

    if(strncmp(pp,"<",4)==0) {

      *pp='<'; ovlstrcpy(pp+1,pp+4); continue;

    }

    if(strncmp(pp,">",4)==0) {

      *pp='>'; ovlstrcpy(pp+1,pp+4); continue;

    }

  }

}

/* get the file */

void prepare_file(void)

{

  FILE *f;

  long int flen;

  filelen=0;

  f=fopen(fn1,"r"); if(f==NULL) return;

  fseek(f,0,SEEK_END);flen=ftell(f); fseek(f,0,SEEK_SET);

  if(flen>buflim) return;

  filebuf=xmalloc(2*flen+1024);flen=fread(filebuf,1,flen,f);

  fclose(f);

  if(flen<0 || flen>=buflim) flen=0;

  filebuf[flen]=0;

  filelen=flen;

  outf=fopen(fn2,"w"); if(outf==NULL) return;

}

void getmath(char *p)

{

  char *pt, *pv;

  char *p1, *p2, buf[256];

  mathbuf[0]=0;

  pt=find_word_start(p);

  if(strncmp(pt,"\\begin{displaymath}",

             strlen("\\begin{displaymath}"))==0) {

    pt=strchr(pt,'}')+1;

    pv=strstr(pt,"\\end{displaymath}");

    if(pv==NULL) return;

    goto insmath;

  }

  if(*pt=='%') pt=strchr(pt,'$');

  if(pt==NULL) return;

  if(*pt!='$') return;

  do pt++; while(*pt=='$');

  pv=strchr(pt,'$'); if(pv==NULL) return;

  insmath: if(pv-pt>=MAX_LINELEN-256) return;

  memmove(mathbuf,pt,pv-pt); mathbuf[pv-pt]=0;

  if(strstr(mathbuf,"...\n...")!=NULL) {

    ovlstrcpy(mathbuf,"......"); return;

  }

  cutamp(mathbuf); latex2html=1;

  for(p1=strstr(mathbuf,"\\mathbb");p1;p1=strstr(p1+1,"\\mathbb")) {

    char c,*d;

    p2=find_word_start(p1+strlen("\\mathbb")); c=0;

    if(strchr("NZQRC",*p2)!=NULL) c=*p2;

    else

      if(*p2=='{' && *(p2+2)=='}' && strchr("NZQRC",*(p2+1))!=NULL) {

        c=*(p2+1); p2+=2;

      }

    if(c) {

      p2=find_word_start(++p2);

      if(isalnum(*p2)) d=" "; else d="";

      string_modify(mathbuf,p1,p2,"\\%c%c%s",c,c,d);

    }

  }

  for(p1=strstr(mathbuf,"{\\"); p1; p1=strstr(p1+1,"{\\")) {

    if(p1>mathbuf && isalpha(*(p1-1))) continue;

    for(p2=p1+2; p2<p1+24 && isalpha(*p2); p2++);

    if(*p2!='}' || isalnum(*(p2+1))) continue;

    memmove(buf,p1+1,p2-p1-1); buf[p2-p1-1]='\\'; buf[p2-p1]=0;

    if(strstr(hmsame,buf)==NULL) continue;

    ovlstrcpy(p2,p2+1); ovlstrcpy(p1,p1+1);

  }

  if(strstr(mathbuf,"\\begin{")!=NULL) return;

  for(p1=strchr(mathbuf,'{'); p1; p1=strchr(p1+1,'{')) {

    if((p1>mathbuf && isalpha(*(p1-1))) ||

       !isalnum(*(p1+1)) || *(p1+2)!='}') continue;

    *p1=*(p1+1); ovlstrcpy(p1+1,p1+3);

  }

  if(strchr(mathbuf,'[')!=NULL) {

    char mbuf[MAX_LINELEN+1];

    snprintf(mbuf,sizeof(mbuf),"{%s}",mathbuf);

    ovlstrcpy(mathbuf,mbuf);

  }

/* try to simplify */

  if(strchr(mathbuf,'{')==NULL && strchr(mathbuf,'\\')!=NULL) {

    int i, tt;

    tt=0;

    for(p1=strchr(mathbuf,'\\'); p1; p1=strchr(p1+1,'\\')) {

      for(p2=p1+1;isalpha(*p2);p2++);

      if(p2==p1+1 || p2>p1+24) {tt=1; break;}

      memmove(buf,p1,p2-p1);buf[p2-p1]='\\';buf[p2-p1+1]=0;

      for(i=0;i<backtransno && strcmp(buf,backtrans[i].name)!=0;i++);

      if(i>=backtransno && strstr(hmsame,buf)==NULL) {

        tt=1; break;

      }

    }

    if(tt==0) {

      for(p1=strchr(mathbuf,'\\'); p1; p1=strchr(p1+1,'\\')) {

        for(p2=p1+1;isalpha(*p2);p2++);

        if(p2==p1+1 || p2>p1+24) break;

        memmove(buf,p1,p2-p1);buf[p2-p1]='\\';buf[p2-p1+1]=0;

        for(i=0;i<backtransno && strcmp(buf,backtrans[i].name)!=0;i++);

        if(i<backtransno)

          string_modify(buf,p1,p2,backtrans[i].trans);

        else *p1=' ';

      }

    }

  }

}

void output(void)

{

  char *p, *pp, *p2, *pt;

  char buf[MAX_LINELEN+1];

  p=filebuf;

  restart:

  pp=find_tag(p,"body");

  if(*pp!=0) {

    p=find_tag_end(pp); goto restart;

  }

  pp=find_tag(p,"html");

  if(*pp!=0) {

    p=find_tag_end(pp); goto restart;

  }

  *find_tag(p,"/body")=0; *find_tag(p,"/html")=0;

  for(pp=strstr(p,"\n\n"); pp; pp=strstr(pp+1,"\n\n")) *pp=' ';

  for(pp=strchr(p,'<');pp!=NULL;pp=strchr(find_tag_end(pp),'<')) {

    if(pp>p) {fwrite(p,1,pp-p,outf); p=pp;}

    if(latex2html && strncasecmp(pp,"<br><hr>",8)==0 &&

       *find_word_start(pp+8)==0) break;

    if(strncasecmp(pp+1,"!-- MATH",8)==0) {

      p2=strstr(pp+8,"-->"); if(p2==NULL) continue;

      *p2=0; getmath(pp+9); *p2='-';

      p=p2+3; pt=find_word_start(p);

      if(mathbuf[0] && strncasecmp(pt,"<IMG",4)==0 && isspace(*(pt+4))) {

        p=find_tag_end(pt); pp=pt;

        fprintf(outf,"\\(%s\\)",mathbuf);

      }

      continue;

    }

    if(strncasecmp(pp+1,"a",1)==0 && isspace(*(pp+2))) {

      continue;

    }

    if(strncasecmp(pp+1,"img",3)==0 && isspace(*(pp+4))) {

      p2=find_tag_end(pp);

      if(p2-pp>=MAX_LINELEN-256) continue;

      memmove(buf,pp+1,p2-pp-2); buf[p2-pp-2]=0;

      pt=strstr(buf,"ALT=\""); if(pt==NULL) pt=strstr(buf,"alt=\"");

      if(pt!=NULL) {

        pt+=strlen("ALT=\"");

        getmath(pt); if(mathbuf[0]) {

          fprintf(outf,"\\(%s\\)",mathbuf); p=p2;

        }

      }

    }

  }

  if(pp==NULL) fprintf(outf,"%s",p);

}

int main(int argc, char *argv[])

{

  char *p, *pp;

  char *mod;

  mod=getenv("w_module");

  if(mod!=NULL && strncmp(mod,"adm/",4)!=0 && strcmp(mod,"home")!=0) return 1;

  if(mod==NULL) p=argv[1]; else p=getenv("wims_exec_parm");

  if(p==NULL || *p==0) return 1;

  p=find_word_start(p); pp=find_word_end(p);

  if(pp<=p || pp-p>sizeof(fn1)-1) return 1;

  memmove(fn1,p,pp-p); fn1[pp-p]=0;

  p=find_word_start(pp); pp=find_word_end(p);

  if(pp<=p || pp-p>sizeof(fn2)-1) ovlstrcpy(fn2,fn1);

  else {memmove(fn2,p,pp-p); fn2[pp-p]=0;}

  prepare_file();

  output();

  fclose(outf);

  return 0;

}