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/*----------------------------------------------------------------------*/
/* Tag callback mechanism */
/*----------------------------------------------------------------------*/
#include <stdio.h>
#include <tk.h>
#include <string.h> /* for strlen() */
#include "net.h" /* defines TRUE and FALSE */
Tcl_HashTable IrsimTagTable;
/*----------------------------------------------------------------------*/
/* Quick reimplementation of strdup() using Tcl's alloc calls */
/*----------------------------------------------------------------------*/
char *Tcl_StrDup(const char *s)
{
char *snew;
int slen;
slen = 1 + strlen(s);
snew = Tcl_Alloc(slen);
if (snew != NULL)
memcpy(snew, s, slen);
return snew;
}
/*----------------------------------------------------------------------*/
/* Implement tag callbacks on functions */
/* Find any tags associated with a command and execute them. */
/*----------------------------------------------------------------------*/
int IrsimTagCallback(Tcl_Interp *interp, int argc, char *argv[])
{
int argidx, result = TCL_OK;
char *postcmd, *substcmd, *newcmd, *sptr, *sres;
char *croot = argv[0];
Tcl_HashEntry *entry;
Tcl_SavedResult state;
int reset = FALSE;
int i, llen, cmdnum;
/* Skip over namespace qualifier, if any */
if (!strncmp(croot, "::", 2)) croot += 2;
if (!strncmp(croot, "irsim::", 10)) croot += 10;
entry = Tcl_FindHashEntry(&IrsimTagTable, croot);
postcmd = (entry) ? (char *)Tcl_GetHashValue(entry) : NULL;
if (postcmd)
{
substcmd = (char *)Tcl_Alloc(strlen(postcmd) + 1);
strcpy(substcmd, postcmd);
sptr = substcmd;
/*--------------------------------------------------------------*/
/* Parse "postcmd" for Tk-substitution escapes */
/* Allowed escapes are: */
/* %W substitute the tk path of the calling window */
/* %r substitute the previous Tcl result string */
/* %R substitute the previous Tcl result string and */
/* reset the Tcl result. */
/* %[0-5] substitute the argument to the original command */
/* %N substitute all arguments as a list */
/* %% substitute a single percent character */
/* %* (all others) no action: print as-is. */
/* */
/* Characters "[" and "]" in IRSIM commands are escaped to */
/* prevent Tcl from attempting to treat them as an immediate */
/* evaluation. */
/*--------------------------------------------------------------*/
while ((sptr = strchr(sptr, '%')) != NULL)
{
switch (*(sptr + 1))
{
case 'W': {
char *tkpath = NULL;
Tk_Window tkwind = Tk_MainWindow(interp);
if (tkwind != NULL) tkpath = Tk_PathName(tkwind);
if (tkpath == NULL)
newcmd = (char *)Tcl_Alloc(strlen(substcmd));
else
newcmd = (char *)Tcl_Alloc(strlen(substcmd) + strlen(tkpath));
strcpy(newcmd, substcmd);
if (tkpath == NULL)
strcpy(newcmd + (int)(sptr - substcmd), sptr + 2);
else
{
strcpy(newcmd + (int)(sptr - substcmd), tkpath);
strcat(newcmd, sptr + 2);
}
Tcl_Free(substcmd);
substcmd = newcmd;
sptr = substcmd;
} break;
case 'R':
reset = TRUE;
case 'r':
sres = (char *)Tcl_GetStringResult(interp);
newcmd = (char *)Tcl_Alloc(strlen(substcmd)
+ strlen(sres) + 1);
strcpy(newcmd, substcmd);
sprintf(newcmd + (int)(sptr - substcmd), "\"%s\"", sres);
strcat(newcmd, sptr + 2);
Tcl_Free(substcmd);
substcmd = newcmd;
sptr = substcmd;
break;
case '0': case '1': case '2': case '3': case '4': case '5':
argidx = (int)(*(sptr + 1) - '0');
if ((argidx >= 0) && (argidx < argc))
{
int needList = 0;
if (strchr(argv[argidx], '[') != NULL ||
strchr(argv[argidx], ']') != NULL)
needList = 1;
newcmd = (char *)Tcl_Alloc(strlen(substcmd)
+ strlen(argv[argidx]) + 2 * needList);
strcpy(newcmd, substcmd);
if (needList)
strcpy(newcmd + (int)(sptr - substcmd), "{");
strcpy(newcmd + (int)(sptr - substcmd) + needList,
argv[argidx]);
if (needList)
strcat(newcmd, "}");
strcat(newcmd, sptr + 2);
Tcl_Free(substcmd);
substcmd = newcmd;
sptr = substcmd;
}
else if (argidx >= argc)
{
newcmd = (char *)Tcl_Alloc(strlen(substcmd) + 1);
strcpy(newcmd, substcmd);
strcpy(newcmd + (int)(sptr - substcmd), sptr + 2);
Tcl_Free(substcmd);
substcmd = newcmd;
sptr = substcmd;
}
else sptr++;
break;
case 'N':
llen = 1;
for (i = 1; i < argc; i++)
llen += (1 + strlen(argv[i]));
newcmd = (char *)Tcl_Alloc(strlen(substcmd) + llen);
strcpy(newcmd, substcmd);
strcpy(newcmd + (int)(sptr - substcmd), "{");
for (i = 1; i < argc; i++) {
strcat(newcmd, argv[i]);
if (i < (argc - 1))
strcat(newcmd, " ");
}
strcat(newcmd, "}");
strcat(newcmd, sptr + 2);
Tcl_Free(substcmd);
substcmd = newcmd;
sptr = substcmd;
break;
case '%':
newcmd = (char *)Tcl_Alloc(strlen(substcmd) + 1);
strcpy(newcmd, substcmd);
strcpy(newcmd + (int)(sptr - substcmd), sptr + 1);
Tcl_Free(substcmd);
substcmd = newcmd;
sptr = substcmd;
break;
default:
break;
}
}
/* lprintf(stderr, "Substituted tag callback is \"%s\"\n", substcmd); */
Tcl_SaveResult(interp, &state);
result = Tcl_Eval(interp, substcmd);
if ((result == TCL_OK) && (reset == FALSE))
Tcl_RestoreResult(interp, &state);
else
Tcl_DiscardResult(&state);
Tcl_Free(substcmd);
}
return result;
}
/*--------------------------------------------------------------*/
/* Add a command tag callback */
/*--------------------------------------------------------------*/
int _irsim_tag(ClientData clientData,
Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[])
{
Tcl_HashEntry *entry;
char *hstring;
int new;
if (objc != 2 && objc != 3)
return TCL_ERROR;
entry = Tcl_CreateHashEntry(&IrsimTagTable, Tcl_GetString(objv[1]), &new);
if (entry == NULL) return TCL_ERROR;
hstring = (char *)Tcl_GetHashValue(entry);
if (objc == 2)
{
Tcl_SetResult(interp, hstring, NULL);
return TCL_OK;
}
if (strlen(Tcl_GetString(objv[2])) == 0)
{
Tcl_DeleteHashEntry(entry);
}
else
{
hstring = Tcl_StrDup(Tcl_GetString(objv[2]));
Tcl_SetHashValue(entry, hstring);
}
return TCL_OK;
}
/*--------------------------------------------------------------*/
/* Initialize the tag callback stuff. */
/*--------------------------------------------------------------*/
void TagInit(interp)
Tcl_Interp *interp;
{
Tcl_InitHashTable(&IrsimTagTable, TCL_STRING_KEYS);
Tcl_CreateObjCommand(interp, "irsim::tag",
(Tcl_ObjCmdProc *)_irsim_tag,
(ClientData)NULL, (Tcl_CmdDeleteProc *)NULL);
}
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