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fontconfig/src/fclang.c

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/*
* $RCSId: xc/lib/fontconfig/src/fclang.c,v 1.7 2002/08/26 23:34:31 keithp Exp $
*
* Copyright © 2002 Keith Packard
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of Keith Packard not be used in
* advertising or publicity pertaining to distribution of the software without
* specific, written prior permission. Keith Packard makes no
* representations about the suitability of this software for any purpose. It
* is provided "as is" without express or implied warranty.
*
* KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#include "fcint.h"
typedef struct {
FcChar8 *lang;
FcCharSet charset;
} FcLangCharSet;
typedef struct {
int begin;
int end;
} FcLangCharSetRange;
#include "../fc-lang/fclang.h"
struct _FcLangSet {
FcChar32 map[NUM_LANG_SET_MAP];
FcStrSet *extra;
};
#define FcLangSetBitSet(ls, id) ((ls)->map[(id)>>5] |= ((FcChar32) 1 << ((id) & 0x1f)))
#define FcLangSetBitGet(ls, id) (((ls)->map[(id)>>5] >> ((id) & 0x1f)) & 1)
FcLangSet *
FcFreeTypeLangSet (const FcCharSet *charset,
const FcChar8 *exclusiveLang)
{
int i;
FcChar32 missing;
const FcCharSet *exclusiveCharset = 0;
FcLangSet *ls;
if (exclusiveLang)
exclusiveCharset = FcCharSetForLang (exclusiveLang);
ls = FcLangSetCreate ();
if (!ls)
return 0;
for (i = 0; i < NUM_LANG_CHAR_SET; i++)
{
/*
* Check for Han charsets to make fonts
* which advertise support for a single language
* not support other Han languages
*/
if (exclusiveCharset &&
FcFreeTypeIsExclusiveLang (fcLangCharSets[i].lang) &&
fcLangCharSets[i].charset.leaves != exclusiveCharset->leaves)
{
continue;
}
missing = FcCharSetSubtractCount (&fcLangCharSets[i].charset, charset);
if (FcDebug() & FC_DBG_SCANV)
{
if (missing && missing < 10)
{
FcCharSet *missed = FcCharSetSubtract (&fcLangCharSets[i].charset,
charset);
FcChar32 ucs4;
FcChar32 map[FC_CHARSET_MAP_SIZE];
FcChar32 next;
printf ("\n%s(%d) ", fcLangCharSets[i].lang, missing);
printf ("{");
for (ucs4 = FcCharSetFirstPage (missed, map, &next);
ucs4 != FC_CHARSET_DONE;
ucs4 = FcCharSetNextPage (missed, map, &next))
{
int i, j;
for (i = 0; i < FC_CHARSET_MAP_SIZE; i++)
if (map[i])
{
for (j = 0; j < 32; j++)
if (map[i] & (1 << j))
printf (" %04x", ucs4 + i * 32 + j);
}
}
printf (" }\n\t");
FcCharSetDestroy (missed);
}
else
printf ("%s(%d) ", fcLangCharSets[i].lang, missing);
}
if (!missing)
FcLangSetBitSet (ls, i);
}
if (FcDebug() & FC_DBG_SCANV)
printf ("\n");
return ls;
}
#define FcLangEnd(c) ((c) == '-' || (c) == '\0')
FcLangResult
FcLangCompare (const FcChar8 *s1, const FcChar8 *s2)
{
FcChar8 c1, c2;
FcLangResult result = FcLangDifferentLang;
for (;;)
{
c1 = *s1++;
c2 = *s2++;
c1 = FcToLower (c1);
c2 = FcToLower (c2);
if (c1 != c2)
{
if (FcLangEnd (c1) && FcLangEnd (c2))
result = FcLangDifferentCountry;
return result;
}
else if (!c1)
return FcLangEqual;
else if (c1 == '-')
result = FcLangDifferentCountry;
}
}
/*
* Return FcTrue when s1 contains s2.
*
* s1 contains s2 if s1 equals s2 or if s1 is a
* language with a country and s2 is just a language
*/
static FcBool
FcLangContains (const FcChar8 *s1, const FcChar8 *s2)
{
FcChar8 c1, c2;
for (;;)
{
c1 = *s1++;
c2 = *s2++;
c1 = FcToLower (c1);
c2 = FcToLower (c2);
if (c1 != c2)
{
/* see if s1 has a country while s2 is mising one */
if (c1 == '-' && c2 == '\0')
return FcTrue;
return FcFalse;
}
else if (!c1)
return FcTrue;
}
}
const FcCharSet *
FcCharSetForLang (const FcChar8 *lang)
{
int i;
int country = -1;
for (i = 0; i < NUM_LANG_CHAR_SET; i++)
{
switch (FcLangCompare (lang, fcLangCharSets[i].lang)) {
case FcLangEqual:
return &fcLangCharSets[i].charset;
case FcLangDifferentCountry:
if (country == -1)
country = i;
default:
break;
}
}
if (country == -1)
return 0;
return &fcLangCharSets[i].charset;
}
FcLangSet *
FcLangSetCreate (void)
{
FcLangSet *ls;
ls = malloc (sizeof (FcLangSet));
if (!ls)
return 0;
FcMemAlloc (FC_MEM_LANGSET, sizeof (FcLangSet));
memset (ls->map, '\0', sizeof (ls->map));
ls->extra = 0;
return ls;
}
void
FcLangSetDestroy (FcLangSet *ls)
{
if (ls->extra)
FcStrSetDestroy (ls->extra);
FcMemFree (FC_MEM_LANGSET, sizeof (FcLangSet));
free (ls);
}
FcLangSet *
FcLangSetCopy (const FcLangSet *ls)
{
FcLangSet *new;
new = FcLangSetCreate ();
if (!new)
goto bail0;
memcpy (new->map, ls->map, sizeof (new->map));
if (ls->extra)
{
FcStrList *list;
FcChar8 *extra;
new->extra = FcStrSetCreate ();
if (!new->extra)
goto bail1;
list = FcStrListCreate (ls->extra);
if (!list)
goto bail1;
while ((extra = FcStrListNext (list)))
if (!FcStrSetAdd (new->extra, extra))
{
FcStrListDone (list);
goto bail1;
}
FcStrListDone (list);
}
return new;
bail1:
FcLangSetDestroy (new);
bail0:
return 0;
}
static int
FcLangSetIndex (const FcChar8 *lang)
{
int low, high, mid;
int cmp;
FcChar8 firstChar = FcToLower(lang[0]);
if (firstChar < 'a')
{
low = 0;
high = fcLangCharSetRanges[0].begin;
}
else if(firstChar > 'z')
{
low = fcLangCharSetRanges[25].begin;
high = NUM_LANG_CHAR_SET - 1;
}
else
{
low = fcLangCharSetRanges[firstChar - 'a'].begin;
high = fcLangCharSetRanges[firstChar - 'a'].end;
/* no matches */
if (low > high)
return -low; /* next entry after where it would be */
}
while (low <= high)
{
mid = (high + low) >> 1;
if(fcLangCharSets[mid].lang[0] != firstChar)
cmp = FcStrCmpIgnoreCase(fcLangCharSets[mid].lang, lang);
else
{ /* fast path for resolving 2-letter languages (by far the most common) after
* finding the first char (probably already true because of the hash table) */
FcChar8 secondChar = FcToLower(lang[1]);
if (fcLangCharSets[mid].lang[1] > secondChar) // check second chars
{
high = mid - 1;
continue;
}
else if (fcLangCharSets[mid].lang[1] < secondChar)
{
low = mid + 1;
continue;
}
else if (fcLangCharSets[mid].lang[2] == '\0' && lang[2] == '\0')
return mid;
else /* identical through the first two charcters, but at least one string didn't end there */
cmp = FcStrCmpIgnoreCase(fcLangCharSets[mid].lang+2, lang+2);
}
if (cmp == 0)
return mid;
if (cmp < 0)
low = mid + 1;
else
high = mid - 1;
}
if (cmp < 0)
mid++;
return -(mid + 1);
}
FcBool
FcLangSetAdd (FcLangSet *ls, const FcChar8 *lang)
{
int id;
id = FcLangSetIndex (lang);
if (id >= 0)
{
FcLangSetBitSet (ls, id);
return FcTrue;
}
if (!ls->extra)
{
ls->extra = FcStrSetCreate ();
if (!ls->extra)
return FcFalse;
}
return FcStrSetAdd (ls->extra, lang);
}
FcLangResult
FcLangSetHasLang (const FcLangSet *ls, const FcChar8 *lang)
{
int id;
FcLangResult best, r;
int i;
id = FcLangSetIndex (lang);
if (id < 0)
id = -id - 1;
else if (FcLangSetBitGet (ls, id))
return FcLangEqual;
best = FcLangDifferentLang;
for (i = id - 1; i >= 0; i--)
{
r = FcLangCompare (lang, fcLangCharSets[i].lang);
if (r == FcLangDifferentLang)
break;
if (FcLangSetBitGet (ls, i) && r < best)
best = r;
}
for (i = id; i < NUM_LANG_CHAR_SET; i++)
{
r = FcLangCompare (lang, fcLangCharSets[i].lang);
if (r == FcLangDifferentLang)
break;
if (FcLangSetBitGet (ls, i) && r < best)
best = r;
}
if (ls->extra)
{
FcStrList *list = FcStrListCreate (ls->extra);
FcChar8 *extra;
FcLangResult r;
if (list)
{
while (best > FcLangEqual && (extra = FcStrListNext (list)))
{
r = FcLangCompare (lang, extra);
if (r < best)
best = r;
}
FcStrListDone (list);
}
}
return best;
}
static FcLangResult
FcLangSetCompareStrSet (const FcLangSet *ls, FcStrSet *set)
{
FcStrList *list = FcStrListCreate (set);
FcLangResult r, best = FcLangDifferentLang;
FcChar8 *extra;
if (list)
{
while (best > FcLangEqual && (extra = FcStrListNext (list)))
{
r = FcLangSetHasLang (ls, extra);
if (r < best)
best = r;
}
FcStrListDone (list);
}
return best;
}
FcLangResult
FcLangSetCompare (const FcLangSet *lsa, const FcLangSet *lsb)
{
int i, j;
FcLangResult best, r;
for (i = 0; i < NUM_LANG_SET_MAP; i++)
if (lsa->map[i] & lsb->map[i])
return FcLangEqual;
best = FcLangDifferentLang;
for (j = 0; j < NUM_COUNTRY_SET; j++)
for (i = 0; i < NUM_LANG_SET_MAP; i++)
if ((lsa->map[i] & fcLangCountrySets[j][i]) &&
(lsb->map[i] & fcLangCountrySets[j][i]))
{
best = FcLangDifferentCountry;
break;
}
if (lsa->extra)
{
r = FcLangSetCompareStrSet (lsb, lsa->extra);
if (r < best)
best = r;
}
if (best > FcLangEqual && lsb->extra)
{
r = FcLangSetCompareStrSet (lsa, lsb->extra);
if (r < best)
best = r;
}
return best;
}
/*
* Used in computing values -- mustn't allocate any storage
*/
FcLangSet *
FcLangSetPromote (const FcChar8 *lang)
{
static FcLangSet ls;
static FcStrSet strs;
static FcChar8 *str;
int id;
memset (ls.map, '\0', sizeof (ls.map));
ls.extra = 0;
id = FcLangSetIndex (lang);
if (id > 0)
{
FcLangSetBitSet (&ls, id);
}
else
{
ls.extra = &strs;
strs.num = 1;
strs.size = 1;
strs.strs = &str;
strs.ref = 1;
str = (FcChar8 *) lang;
}
return &ls;
}
FcChar32
FcLangSetHash (const FcLangSet *ls)
{
FcChar32 h = 0;
int i;
for (i = 0; i < NUM_LANG_SET_MAP; i++)
h ^= ls->map[i];
if (ls->extra)
h ^= ls->extra->num;
return h;
}
FcLangSet *
FcNameParseLangSet (const FcChar8 *string)
{
FcChar8 lang[32],c;
int i;
FcLangSet *ls;
ls = FcLangSetCreate ();
if (!ls)
goto bail0;
for(;;)
{
for(i = 0; i < 31;i++)
{
c = *string++;
if(c == '\0' || c == '|')
break; /* end of this code */
lang[i] = c;
}
lang[i] = '\0';
if (!FcLangSetAdd (ls, lang))
goto bail1;
if(c == '\0')
break;
}
return ls;
bail1:
FcLangSetDestroy (ls);
bail0:
return 0;
}
FcBool
FcNameUnparseLangSet (FcStrBuf *buf, const FcLangSet *ls)
{
int i, bit;
FcChar32 bits;
FcBool first = FcTrue;
for (i = 0; i < NUM_LANG_SET_MAP; i++)
{
if ((bits = ls->map[i]))
{
for (bit = 0; bit <= 31; bit++)
if (bits & (1 << bit))
{
int id = (i << 5) | bit;
if (!first)
if (!FcStrBufChar (buf, '|'))
return FcFalse;
if (!FcStrBufString (buf, fcLangCharSets[id].lang))
return FcFalse;
first = FcFalse;
}
}
}
if (ls->extra)
{
FcStrList *list = FcStrListCreate (ls->extra);
FcChar8 *extra;
if (!list)
return FcFalse;
while ((extra = FcStrListNext (list)))
{
if (!first)
if (!FcStrBufChar (buf, '|'))
return FcFalse;
if (!FcStrBufString (buf, extra))
return FcFalse;
first = FcFalse;
}
}
return FcTrue;
}
FcBool
FcLangSetEqual (const FcLangSet *lsa, const FcLangSet *lsb)
{
int i;
for (i = 0; i < NUM_LANG_SET_MAP; i++)
{
if (lsa->map[i] != lsb->map[i])
return FcFalse;
}
if (!lsa->extra && !lsb->extra)
return FcTrue;
if (lsa->extra && lsb->extra)
return FcStrSetEqual (lsa->extra, lsb->extra);
return FcFalse;
}
static FcBool
FcLangSetContainsLang (const FcLangSet *ls, const FcChar8 *lang)
{
int id;
FcLangResult r;
int i;
id = FcLangSetIndex (lang);
if (id < 0)
id = -id - 1;
else if (FcLangSetBitGet (ls, id))
return FcTrue;
/*
* search up and down among equal languages for a match
*/
for (i = id - 1; i >= 0; i--)
{
if (FcLangCompare (fcLangCharSets[i].lang, lang) == FcLangDifferentLang)
break;
if (FcLangSetBitGet (ls, i) &&
FcLangContains (fcLangCharSets[i].lang, lang))
return FcTrue;
}
for (i = id; i < NUM_LANG_CHAR_SET; i++)
{
if (FcLangCompare (fcLangCharSets[i].lang, lang) == FcLangDifferentLang)
break;
if (FcLangSetBitGet (ls, i) &&
FcLangContains (fcLangCharSets[i].lang, lang))
return FcTrue;
}
if (ls->extra)
{
FcStrList *list = FcStrListCreate (ls->extra);
FcChar8 *extra;
FcLangResult r;
if (list)
{
while ((extra = FcStrListNext (list)))
{
if (FcLangContains (extra, lang))
break;
}
FcStrListDone (list);
if (extra)
return FcTrue;
}
}
return FcFalse;
}
/*
* return FcTrue if lsa contains every language in lsb
*/
FcBool
FcLangSetContains (const FcLangSet *lsa, const FcLangSet *lsb)
{
int i, j;
FcChar32 missing;
if (FcDebug() & FC_DBG_MATCHV)
{
printf ("FcLangSet "); FcLangSetPrint (lsa);
printf (" contains "); FcLangSetPrint (lsb);
printf ("\n");
}
/*
* check bitmaps for missing language support
*/
for (i = 0; i < NUM_LANG_SET_MAP; i++)
{
missing = lsb->map[i] & ~lsa->map[i];
if (missing)
{
for (j = 0; j < 32; j++)
if (missing & (1 << j))
{
if (!FcLangSetContainsLang (lsa,
fcLangCharSets[i*32 + j].lang))
{
if (FcDebug() & FC_DBG_MATCHV)
printf ("\tMissing bitmap %s\n", fcLangCharSets[i*32+j].lang);
return FcFalse;
}
}
}
}
if (lsb->extra)
{
FcStrList *list = FcStrListCreate (lsb->extra);
FcChar8 *extra;
if (list)
{
while ((extra = FcStrListNext (list)))
{
if (!FcLangSetContainsLang (lsa, extra))
{
if (FcDebug() & FC_DBG_MATCHV)
printf ("\tMissing string %s\n", extra);
break;
}
}
FcStrListDone (list);
if (extra)
return FcFalse;
}
}
return FcTrue;
}
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