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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. leftpar2,leftpar3,leftpar4,leftpar5,leftpar6,\
  27. leftpar7,leftpar8,leftpar9,leftpar10,leftpar11,leftpar12,\
  28. rightpar2,rightpar3,rightpar4,rightpar5,rightpar6,\
  29. rightpar7,rightpar8,rightpar9,rightpar10,rightpar11,rightpar12,\
  30. leftbrace2,leftbrace3,leftbrace4,leftbrace5,leftbrace6,\
  31. leftbrace7,leftbrace8,leftbrace9,leftbrace10,leftbrace11,leftbrace12,\
  32. rightbrace2,rightbrace3,rightbrace4,rightbrace5,rightbrace6,\
  33. rightbrace7,rightbrace8,rightbrace9,rightbrace10,rightbrace11,rightbrace12,";
  34.  
  35. /* These are temporary definitions. */
  36. char *mathfont_dir="mathfonts";
  37.  
  38. /* tex font size list */
  39. int texsize_list[]={63,69,76,83,91,100,109,120,131,144,158,173};
  40. int texbasesize=6; /* defaults to 109 */
  41. int usertexsize=-1; /* non-negative if defined */
  42. #define texsize_no (sizeof(texsize_list)/sizeof(texsize_list[0]))
  43.  
  44. int current_tex_size;
  45.  
  46. void fix_tex_size(void)
  47. {
  48.   char buf[64],*p; int i,ts;
  49.   ts=texbasesize;
  50.   if(usertexsize>=0) ts=usertexsize+1;
  51.   if(getwimstexsize) p=getvar("wims_texsize"); else p=NULL;
  52.   if(p!=NULL && *p!=0) {
  53.     i=evalue(p);
  54.     if(i>=-5 && i<=5) ts+=i;
  55.   }
  56.   if(ts<0) ts=0;
  57.   if(ts>=texsize_no) ts=texsize_no-1;
  58.   current_tex_size=texsize_list[ts];
  59.   snprintf(buf,sizeof(buf),"%d",current_tex_size);
  60.   setenv("texgif_density",buf,1);
  61. }
  62.  
  63. /* takes math font image file string */
  64. char *mathfont(char *fontname)
  65. {
  66.   char buf1[MAX_LINELEN+1],buf2[MAX_LINELEN+1];
  67.   struct stat st;
  68.  
  69.   if(fontname[0]=='\\') fontname++;
  70.   else if(strncmp(fontname,mathfont_prefix,strlen(mathfont_prefix))==0)
  71.     fontname+=strlen(mathfont_prefix);
  72.   if(strlen(fontname)==1 /* && strchr("xyz",fontname[0])==NULL */) {
  73.     char c=fontname[0];
  74.     if(!isalpha(c)) { // c is not a letter
  75.       buf2[0]=c;buf2[1]=0;
  76.    }
  77.    else {
  78. // case of variable xyz in particular
  79.     char *pp;
  80.     if(c=='f') pp="&nbsp;"; else pp="";
  81.     snprintf(buf2,sizeof(buf2),"<i>%c</i>%s",c,pp);
  82. //FIXME-> should we arrive here in mathml case ???
  83.     }
  84.   }
  85.   else {/* interpret font with at least two caracters as \RR \calB - only outside of math environment
  86.     not useful in mathml*/
  87.     char *underscore;
  88.     fix_tex_size(); underscore="";
  89.     {
  90.       char *p, *p2;
  91.       for(p=fontname; *p && !isupper(*p); p++);
  92. /* verify positionning of capital letter */
  93.       if(*p && p>fontname && *(p+1)!=0) return NULL;
  94.       if(p==fontname && (fontname[1]!=*p || strlen(fontname)!=2)) {
  95.         for(p2=p+1; *p2 && !isupper(*p2); p2++);
  96.         if(*p2) return NULL;
  97.       }
  98.       if(*p) underscore="_";
  99.     }
  100.     snprintf(buf1,sizeof(buf1),"%s/%d/%s%s.gif",
  101.            mathfont_dir,current_tex_size,fontname,underscore);
  102.     if(*underscore && stat(buf1,&st)!=0)
  103.       snprintf(buf1,sizeof(buf1),"%s/%d/%s.gif",
  104.              mathfont_dir,current_tex_size,fontname);
  105.  
  106.     if(stat(buf1,&st)!=0) return NULL;
  107.     snprintf(buf2,sizeof(buf2),",%s,",fontname);
  108.     if(strstr(middle_fonts,buf2)!=NULL)
  109.       snprintf(buf2,sizeof(buf2),
  110.              "%s<img src=\"%s%s\" style=\"vertical-align: middle; border:none\" \
  111. alt=\"%s\" />%s",
  112.              mathalign_sup1,ref_base,buf1,fontname,mathalign_sup2);
  113.     else
  114.        snprintf(buf2,sizeof(buf2),"<img src=\"%s%s\" style=\"margin:0px; border:none\" \
  115. alt=\"%s\" />",
  116.              ref_base,buf1,fontname);
  117.   }
  118.   force_setvar("wims_mathfont_",buf2); return getvar("wims_mathfont_");
  119. }
  120.