src/fclang.c

   1 /*
   2  * $XFree86: xc/lib/fontconfig/fc-lang/fclang.tmpl.c,v 1.1 2002/07/06 23:21:36 keithp Exp $
   3  *
   4  * Copyright © 2002 Keith Packard, member of The XFree86 Project, Inc.
   5  *
   6  * Permission to use, copy, modify, distribute, and sell this software and its
   7  * documentation for any purpose is hereby granted without fee, provided that
   8  * the above copyright notice appear in all copies and that both that
   9  * copyright notice and this permission notice appear in supporting
  10  * documentation, and that the name of Keith Packard not be used in
  11  * advertising or publicity pertaining to distribution of the software without
  12  * specific, written prior permission.  Keith Packard makes no
  13  * representations about the suitability of this software for any purpose.  It
  14  * is provided "as is" without express or implied warranty.
  15  *
  16  * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  17  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  18  * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  19  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  20  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  21  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  22  * PERFORMANCE OF THIS SOFTWARE.
  23  */
  24
  25 #include "fcint.h"
  26
  27 typedef struct {
  28     FcChar8     *lang;
  29     FcCharSet   charset;
  30 } FcLangCharSet;
  31
  32 #include "../fc-lang/fclang.h"
  33
  34 #define NUM_LANG_CHAR_SET       (sizeof (fcLangCharSets) / sizeof (fcLangCharSets[0]))
  35
  36 FcBool
  37 FcFreeTypeSetLang (FcPattern        *pattern,
  38                    FcCharSet        *charset,
  39                    const FcChar8    *exclusiveLang)
  40 {
  41     int             i;
  42     FcChar32        missing;
  43     FcBool          hasLang = FcFalse;
  44     const FcCharSet *exclusiveCharset = 0;
  45
  46     if (exclusiveLang)
  47         exclusiveCharset = FcCharSetForLang (exclusiveLang);
  48     for (i = 0; i < NUM_LANG_CHAR_SET; i++)
  49     {
  50         /*
  51          * Check for Han charsets to make fonts
  52          * which advertise support for a single language
  53          * not support other Han languages
  54          */
  55         if (exclusiveCharset &&
  56             FcFreeTypeIsExclusiveLang (fcLangCharSets[i].lang) &&
  57             fcLangCharSets[i].charset.leaves != exclusiveCharset->leaves)
  58         {
  59             continue;
  60         }
  61         missing = FcCharSetSubtractCount (&fcLangCharSets[i].charset, charset);
  62         if (FcDebug() & FC_DBG_SCANV)
  63             printf ("%s(%d) ", fcLangCharSets[i].lang, missing);
  64         if (!missing)
  65         {
  66             if (!FcPatternAddString (pattern, FC_LANG, fcLangCharSets[i].lang))
  67                 return FcFalse;
  68             hasLang = FcTrue;
  69         }
  70     }
  71     /*
  72      * Make sure it has a lang entry
  73      */
  74     if (!hasLang)
  75         if (!FcPatternAddString (pattern, FC_LANG, (FcChar8 *) "x-unknown"))
  76             return FcFalse;
  77
  78     if (FcDebug() & FC_DBG_SCANV)
  79         printf ("\n");
  80     return FcTrue;
  81 }
  82
  83
  84 FcLangResult
  85 FcLangCompare (const FcChar8 *s1, const FcChar8 *s2)
  86 {
  87     const FcChar8   *orig_s1 = s1;
  88     FcChar8         c1, c2;
  89     FcLangResult    result;
  90     /*
  91      * Compare ISO 639 language codes
  92      */
  93     for (;;)
  94     {
  95         c1 = *s1++;
  96         c2 = *s2++;
  97         if (c1 == '\0' || c1 == '-')
  98             break;
  99         if (c2 == '\0' || c2 == '-')
 100             break;
 101         c1 = FcToLower (c1);
 102         c2 = FcToLower (c2);
 103         if (c1 != c2)
 104             return FcLangDifferentLang;     /* mismatching lang code */
 105     }
 106     if (!c1 && !c2)
 107         return FcLangEqual;
 108     /*
 109      * Make x-* mismatch as if the lang part didn't match
 110      */
 111     result = FcLangDifferentCountry;
 112     if (orig_s1[0] == 'x' && (orig_s1[1] == '\0' || orig_s1[1] == '-'))
 113         result = FcLangDifferentLang;
 114
 115     if (c1 == '\0' || c2 == '\0')
 116         return result;
 117     /*
 118      * Compare ISO 3166 country codes
 119      */
 120     for (;;)
 121     {
 122         c1 = *s1++;
 123         c2 = *s2++;
 124         if (!c1 || !c2)
 125             break;
 126         c1 = FcToLower (c1);
 127         c2 = FcToLower (c2);
 128         if (c1 != c2)
 129             break;
 130     }
 131     if (c1 == c2)
 132         return FcLangEqual;
 133     else
 134         return result;
 135 }
 136
 137 const FcCharSet *
 138 FcCharSetForLang (const FcChar8 *lang)
 139 {
 140     int         i;
 141     int         country = -1;
 142     for (i = 0; i < NUM_LANG_CHAR_SET; i++)
 143     {
 144         switch (FcLangCompare (lang, fcLangCharSets[i].lang)) {
 145         case FcLangEqual:
 146             return &fcLangCharSets[i].charset;
 147         case FcLangDifferentCountry:
 148             if (country == -1)
 149                 country = i;
 150         default:
 151             break;
 152         }
 153     }
 154     if (country == -1)
 155         return 0;
 156     return &fcLangCharSets[i].charset;
 157 }