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[fcformat] Implement 'delete', 'escape', and 'translate' filter functions 

The format '%{family|delete( )}' expands to family values with space removed.
The format '%{family|translate( ,-)}' expands to family values with space
replaced by dash.  Multiple chars are supported, like tr(1).
The format '%{family|escape(\\ )}' expands to family values with space
escaped using backslash.
This commit is contained in:
Behdad Esfahbod 2009-02-10 05:57:10 -05:00
parent b6a23028be
commit c8f5933d13
1 changed files with 194 additions and 25 deletions
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219
src/fcformat.c
View File

@ -124,6 +124,20 @@ FcCharIsPunct (const FcChar8 c)
return FcFalse;
}
static char escaped_char(const char ch)
{
switch (ch) {
case 'a': return '\a';
case 'b': return '\b';
case 'f': return '\f';
case 'n': return '\n';
case 'r': return '\r';
case 't': return '\t';
case 'v': return '\v';
default: return ch;
}
}
static FcBool
read_word (FcFormatContext *c)
{
@ -137,7 +151,7 @@ read_word (FcFormatContext *c)
{
c->format++;
if (*c->format)
c->format++;
*p++ = escaped_char (*c->format++);
continue;
}
else if (FcCharIsPunct (*c->format))
@ -157,6 +171,38 @@ read_word (FcFormatContext *c)
return FcTrue;
}
static FcBool
read_chars (FcFormatContext *c,
FcChar8 term)
{
FcChar8 *p;
p = c->word;
while (*c->format && *c->format != '}' && *c->format != term)
{
if (*c->format == '\\')
{
c->format++;
if (*c->format)
*p++ = escaped_char (*c->format++);
continue;
}
*p++ = *c->format++;
}
*p = '\0';
if (p == c->word)
{
message ("expected character data at %d",
c->format - c->format_orig + 1);
return FcFalse;
}
return FcTrue;
}
static FcBool
interpret_expr (FcFormatContext *c,
FcPattern *pat,
@ -403,7 +449,7 @@ interpret_count (FcFormatContext *c,
count++;
}
snprintf (buf_static, sizeof (buf_static), "%d", count);
snprintf ((char *) buf_static, sizeof (buf_static), "%d", count);
FcStrBufString (buf, buf_static);
return FcTrue;
@ -452,7 +498,7 @@ static FcChar8 *
cescape (const FcChar8 *str)
{
FcStrBuf buf;
FcChar8 buf_static[8192];
FcChar8 buf_static[8192];
FcStrBufInit (&buf, buf_static, sizeof (buf_static));
while(*str)
@ -473,7 +519,7 @@ static FcChar8 *
shescape (const FcChar8 *str)
{
FcStrBuf buf;
FcChar8 buf_static[8192];
FcChar8 buf_static[8192];
FcStrBufInit (&buf, buf_static, sizeof (buf_static));
FcStrBufChar (&buf, '\'');
@ -493,7 +539,7 @@ static FcChar8 *
xmlescape (const FcChar8 *str)
{
FcStrBuf buf;
FcChar8 buf_static[8192];
FcChar8 buf_static[8192];
FcStrBufInit (&buf, buf_static, sizeof (buf_static));
while(*str)
@ -510,6 +556,137 @@ xmlescape (const FcChar8 *str)
return FcStrBufDone (&buf);
}
static FcChar8 *
delete_chars (FcFormatContext *c,
const FcChar8 *str)
{
FcStrBuf buf;
FcChar8 buf_static[8192];
/* XXX not UTF-8 aware */
if (!expect_char (c, '(') ||
!read_chars (c, ')') ||
!expect_char (c, ')'))
return NULL;
FcStrBufInit (&buf, buf_static, sizeof (buf_static));
while(*str)
{
FcChar8 *p;
p = (FcChar8 *) strpbrk ((const char *) str, (const char *) c->word);
if (p)
{
FcStrBufData (&buf, str, p - str);
str = p + 1;
}
else
{
FcStrBufString (&buf, str);
break;
}
}
return FcStrBufDone (&buf);
}
static FcChar8 *
escape_chars (FcFormatContext *c,
const FcChar8 *str)
{
FcStrBuf buf;
FcChar8 buf_static[8192];
/* XXX not UTF-8 aware */
if (!expect_char (c, '(') ||
!read_chars (c, ')') ||
!expect_char (c, ')'))
return NULL;
FcStrBufInit (&buf, buf_static, sizeof (buf_static));
while(*str)
{
FcChar8 *p;
p = (FcChar8 *) strpbrk ((const char *) str, (const char *) c->word);
if (p)
{
FcStrBufData (&buf, str, p - str);
FcStrBufChar (&buf, c->word[0]);
FcStrBufChar (&buf, *p);
str = p + 1;
}
else
{
FcStrBufString (&buf, str);
break;
}
}
return FcStrBufDone (&buf);
}
static FcChar8 *
translate_chars (FcFormatContext *c,
const FcChar8 *str)
{
FcStrBuf buf;
FcChar8 buf_static[8192];
char *from, *to, repeat;
int from_len, to_len;
/* XXX not UTF-8 aware */
if (!expect_char (c, '(') ||
!read_chars (c, ',') ||
!expect_char (c, ','))
return NULL;
from = (char *) c->word;
from_len = strlen (from);
to = from + from_len + 1;
/* hack: we temporarily diverge c->word */
c->word = (FcChar8 *) to;
if (!read_chars (c, ')'))
{
c->word = (FcChar8 *) from;
return FcFalse;
}
c->word = (FcChar8 *) from;
to_len = strlen (to);
repeat = to[to_len - 1];
if (!expect_char (c, ')'))
return FcFalse;
FcStrBufInit (&buf, buf_static, sizeof (buf_static));
while(*str)
{
FcChar8 *p;
p = (FcChar8 *) strpbrk ((const char *) str, (const char *) from);
if (p)
{
int i;
FcStrBufData (&buf, str, p - str);
i = strchr (from, *p) - from;
FcStrBufChar (&buf, i < to_len ? to[i] : repeat);
str = p + 1;
}
else
{
FcStrBufString (&buf, str);
break;
}
}
return FcStrBufDone (&buf);
}
static FcChar8 *
convert (FcFormatContext *c,
const FcChar8 *str)
@ -519,12 +696,18 @@ convert (FcFormatContext *c,
#define CONVERTER(name, func) \
else if (0 == strcmp ((const char *) c->word, name))\
return func (str)
CONVERTER ("downcase", FcStrDowncase);
CONVERTER ("basename", FcStrBasename);
CONVERTER ("dirname", FcStrDirname);
CONVERTER ("cescape", cescape);
CONVERTER ("shescape", shescape);
CONVERTER ("xmlescape", xmlescape);
#define CONVERTER2(name, func) \
else if (0 == strcmp ((const char *) c->word, name))\
return func (c, str)
CONVERTER ("downcase", FcStrDowncase);
CONVERTER ("basename", FcStrBasename);
CONVERTER ("dirname", FcStrDirname);
CONVERTER ("cescape", cescape);
CONVERTER ("shescape", shescape);
CONVERTER ("xmlescape", xmlescape);
CONVERTER2 ("delete", delete_chars);
CONVERTER2 ("escape", escape_chars);
CONVERTER2 ("translate", translate_chars);
message ("unknown converter \"%s\"",
c->word);
@ -636,20 +819,6 @@ interpret_percent (FcFormatContext *c,
expect_char (c, '}');
}
static char escaped_char(const char ch)
{
switch (ch) {
case 'a': return '\a';
case 'b': return '\b';
case 'f': return '\f';
case 'n': return '\n';
case 'r': return '\r';
case 't': return '\t';
case 'v': return '\v';
default: return ch;
}
}
static FcBool
interpret_expr (FcFormatContext *c,
FcPattern *pat,