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  1. /*    Copyright (C) 1998-2003 XIAO, Gang of Universite de Nice - Sophia Antipolis
  2.  *
  3.  *  This program is free software; you can redistribute it and/or modify
  4.  *  it under the terms of the GNU General Public License as published by
  5.  *  the Free Software Foundation; either version 2 of the License, or
  6.  *  (at your option) any later version.
  7.  *
  8.  *  This program is distributed in the hope that it will be useful,
  9.  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  10.  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11.  *  GNU General Public License for more details.
  12.  *
  13.  *  You should have received a copy of the GNU General Public License
  14.  *  along with this program; if not, write to the Free Software
  15.  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  16.  */
  17.  
  18. #include "wims.h"
  19.  
  20. /* fonts which should have align=middle */
  21. char *middle_fonts=",y,beta,eta,mu,phi,rho,varphi,psi,\
  22. le,leq,ge,geq,pm,ne,neq,\
  23. subseteq,supseteq,wp,\
  24. int,oint,Vert,\
  25. QQ,\
  26. eufQ,eufz,\
  27. leftpar2,leftpar3,leftpar4,leftpar5,leftpar6,\
  28. leftpar7,leftpar8,leftpar9,leftpar10,leftpar11,leftpar12,\
  29. rightpar2,rightpar3,rightpar4,rightpar5,rightpar6,\
  30. rightpar7,rightpar8,rightpar9,rightpar10,rightpar11,rightpar12,\
  31. leftbrace2,leftbrace3,leftbrace4,leftbrace5,leftbrace6,\
  32. leftbrace7,leftbrace8,leftbrace9,leftbrace10,leftbrace11,leftbrace12,\
  33. rightbrace2,rightbrace3,rightbrace4,rightbrace5,rightbrace6,\
  34. rightbrace7,rightbrace8,rightbrace9,rightbrace10,rightbrace11,rightbrace12,";
  35.  
  36. /* These are temporary definitions. */
  37. char *mathfont_dir="mathfonts";
  38.  
  39. /* tex font size list */
  40. int texsize_list[]={63,69,76,83,91,100,109,120,131,144,158,173};
  41. int texbasesize=6; /* defaults to 109 */
  42. int usertexsize=-1; /* non-negative if defined */
  43. #define texsize_no (sizeof(texsize_list)/sizeof(texsize_list[0]))
  44.  
  45. int current_tex_size;
  46.  
  47. void fix_tex_size(void)
  48. {
  49.   char buf[64],*p; int i,ts;
  50.   ts=texbasesize;
  51.   if(usertexsize>=0) ts=usertexsize+1;
  52.   if(getwimstexsize) p=getvar("wims_texsize"); else p=NULL;
  53.   if(p!=NULL && *p!=0) {
  54.     i=evalue(p);
  55.     if(i>=-5 && i<=5) ts+=i;
  56.   }
  57.   if(ts<0) ts=0;
  58.   if(ts>=texsize_no) ts=texsize_no-1;
  59.   current_tex_size=texsize_list[ts];
  60.   snprintf(buf,sizeof(buf),"%d",current_tex_size);
  61.   setenv("texgif_density",buf,1);
  62. }
  63.  
  64. /* takes math font image file string */
  65. char *mathfont(char *fontname)
  66. {
  67.   char buf1[MAX_LINELEN+1],buf2[MAX_LINELEN+1];
  68.   struct stat st;
  69.  
  70.   if(fontname[0]=='\\') fontname++;
  71.   else if(strncmp(fontname,mathfont_prefix,strlen(mathfont_prefix))==0)
  72.     fontname+=strlen(mathfont_prefix);
  73.   if(strlen(fontname)==1 /* && strchr("xyz",fontname[0])==NULL */) {
  74.     char c=fontname[0];
  75.     if(!isalpha(c)) { // c is not a letter
  76.       buf2[0]=c;buf2[1]=0;
  77.    }
  78.    else {
  79. // case of variable xyz in particular
  80.     char *pp;
  81.     if(c=='f') pp="&nbsp;"; else pp="";
  82.     snprintf(buf2,sizeof(buf2),"<i>%c</i>%s",c,pp);
  83. //FIXME-> should we arrive here in mathml case ???
  84.     }
  85.   }
  86.   else {/* interpret font with at least two caracters as \RR \calB - only outside of math environment
  87.     not useful in mathml*/
  88.     char *underscore;
  89.     fix_tex_size(); underscore="";
  90.     {
  91.       char *p, *p2;
  92.       for(p=fontname; *p && !isupper(*p); p++);
  93. /* verify positionning of capital letter */
  94.       if(*p && p>fontname && *(p+1)!=0) return NULL;
  95.       if(p==fontname && (fontname[1]!=*p || strlen(fontname)!=2)) {
  96.         for(p2=p+1; *p2 && !isupper(*p2); p2++);
  97.         if(*p2) return NULL;
  98.       }
  99.       if(*p) underscore="_";
  100.     }
  101.     snprintf(buf1,sizeof(buf1),"%s/%d/%s%s.gif",
  102.            mathfont_dir,current_tex_size,fontname,underscore);
  103.     if(*underscore && stat(buf1,&st)!=0)
  104.       snprintf(buf1,sizeof(buf1),"%s/%d/%s.gif",
  105.              mathfont_dir,current_tex_size,fontname);
  106.  
  107.     if(stat(buf1,&st)!=0) return NULL;
  108.     snprintf(buf2,sizeof(buf2),",%s,",fontname);
  109.     if(strstr(middle_fonts,buf2)!=NULL)
  110.       snprintf(buf2,sizeof(buf2),
  111.              "%s<img src=\"%s%s\" style=\"vertical-align: middle; border:none\" \
  112. alt=\"%s\" />%s",
  113.              mathalign_sup1,ref_base,buf1,fontname,mathalign_sup2);
  114.     else
  115.        snprintf(buf2,sizeof(buf2),"<img src=\"%s%s\" style=\"margin:0px; border:none\" \
  116. alt=\"%s\" />",
  117.              ref_base,buf1,fontname);
  118.   }
  119.   force_setvar("wims_mathfont_",buf2); return getvar("wims_mathfont_");
  120. }
  121.