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/*
* Copyright (C) 2000, Matias Atria
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <config.h>
#include <ctype.h>
#include <string.h>
#include "mdvi.h"
#include "private.h"
#if defined(WITH_REGEX_SPECIALS) && defined(HAVE_REGEX_H)
#include <regex.h>
#endif
typedef struct _DviSpecial {
struct _DviSpecial *next;
struct _DviSpecial *prev;
char *label;
char *prefix;
size_t plen;
#ifdef WITH_REGEX_SPECIALS
regex_t reg;
int has_reg;
#endif
DviSpecialHandler handler;
} DviSpecial;
static ListHead specials = {NULL, NULL, 0};
#define SPECIAL(x) \
void x __PROTO((DviContext *, const char *, const char *))
static SPECIAL(sp_layer);
extern SPECIAL(epsf_special);
extern SPECIAL(do_color_special);
static struct {
char *label;
char *prefix;
char *regex;
DviSpecialHandler handler;
} builtins[] = {
{"Layers", "layer", NULL, sp_layer},
{"EPSF", "psfile", NULL, epsf_special}
};
#define NSPECIALS (sizeof(builtins) / sizeof(builtins[0]))
static int registered_builtins = 0;
static void register_builtin_specials(void)
{
int i;
ASSERT(registered_builtins == 0);
registered_builtins = 1;
for(i = 0; i < NSPECIALS; i++)
mdvi_register_special(
builtins[i].label,
builtins[i].prefix,
builtins[i].regex,
builtins[i].handler,
1 /* replace if exists */);
}
static DviSpecial *find_special_prefix(const char *prefix)
{
DviSpecial *sp;
/* should have a hash table here, but I'm so lazy */
for(sp = (DviSpecial *)specials.head; sp; sp = sp->next) {
if(STRCEQ(sp->prefix, prefix))
break;
}
return sp;
}
int mdvi_register_special(const char *label, const char *prefix,
const char *regex, DviSpecialHandler handler, int replace)
{
DviSpecial *sp;
int newsp = 0;
if(!registered_builtins)
register_builtin_specials();
sp = find_special_prefix(prefix);
if(sp == NULL) {
sp = xalloc(DviSpecial);
sp->prefix = mdvi_strdup(prefix);
newsp = 1;
} else if(!replace)
return -1;
else {
mdvi_free(sp->label);
sp->label = NULL;
}
#ifdef WITH_REGEX_SPECIALS
if(!newsp && sp->has_reg) {
regfree(&sp->reg);
sp->has_reg = 0;
}
if(regex && regcomp(&sp->reg, regex, REG_NOSUB) != 0) {
if(newsp) {
mdvi_free(sp->prefix);
mdvi_free(sp);
}
return -1;
}
sp->has_reg = (regex != NULL);
#endif
sp->handler = handler;
sp->label = mdvi_strdup(label);
sp->plen = strlen(prefix);
if(newsp)
listh_prepend(&specials, LIST(sp));
DEBUG((DBG_SPECIAL,
"New \\special handler `%s' with prefix `%s'\n",
label, prefix));
return 0;
}
int mdvi_unregister_special(const char *prefix)
{
DviSpecial *sp;
sp = find_special_prefix(prefix);
if(sp == NULL)
return -1;
mdvi_free(sp->prefix);
#ifdef WITH_REGEX_SPECIALS
if(sp->has_reg)
regfree(&sp->reg);
#endif
listh_remove(&specials, LIST(sp));
mdvi_free(sp);
return 0;
}
int mdvi_do_special(DviContext *dvi, char *string)
{
char *prefix;
char *ptr;
DviSpecial *sp;
if(!registered_builtins) {
}
if(!string || !*string)
return 0;
/* skip leading spaces */
while(*string && isspace(*string))
string++;
DEBUG((DBG_SPECIAL, "Looking for a handler for `%s'\n", string));
/* now try to find a match */
ptr = string;
for(sp = (DviSpecial *)specials.head; sp; sp = sp->next) {
#ifdef WITH_REGEX_SPECIALS
if(sp->has_reg && !regexec(&sp->reg, ptr, 0, 0, 0))
break;
#endif
/* check the prefix */
if(STRNCEQ(sp->prefix, ptr, sp->plen)) {
ptr += sp->plen;
break;
}
}
if(sp == NULL) {
DEBUG((DBG_SPECIAL, "None found\n"));
return -1;
}
/* extract the prefix */
if(ptr == string) {
prefix = NULL;
DEBUG((DBG_SPECIAL,
"REGEX match with `%s' (arg `%s')\n",
sp->label, ptr));
} else {
if(*ptr) *ptr++ = 0;
prefix = string;
DEBUG((DBG_SPECIAL,
"PREFIX match with `%s' (prefix `%s', arg `%s')\n",
sp->label, prefix, ptr));
}
/* invoke the handler */
sp->handler(dvi, prefix, ptr);
return 0;
}
void mdvi_flush_specials(void)
{
DviSpecial *sp, *list;
for(list = (DviSpecial *)specials.head; (sp = list); ) {
list = sp->next;
if(sp->prefix) mdvi_free(sp->prefix);
if(sp->label) mdvi_free(sp->label);
#ifdef WITH_REGEX_SPECIALS
if(sp->has_reg)
regfree(&sp->reg);
#endif
mdvi_free(sp);
}
specials.head = NULL;
specials.tail = NULL;
specials.count = 0;
}
/* some builtin specials */
void sp_layer(DviContext *dvi, const char *prefix, const char *arg)
{
if(STREQ("push", arg))
dvi->curr_layer++;
else if(STREQ("pop", arg)) {
if(dvi->curr_layer)
dvi->curr_layer--;
else
mdvi_warning(_("%s: tried to pop top level layer\n"),
dvi->filename);
} else if(STREQ("reset", arg))
dvi->curr_layer = 0;
DEBUG((DBG_SPECIAL, "Layer level: %d\n", dvi->curr_layer));
}
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