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/*
* Smithsonian Astrophysical Observatory, Cambridge, MA, USA
* This code has been modified under the terms listed below and is made
* available under the same terms.
*/
/*
* bltNsUtil.c --
*
* This module implements utility namespace procedures for the BLT toolkit.
*
* Copyright 1997-2008 George A Howlett.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <tclPort.h>
#include <tclInt.h>
#include "bltInt.h"
#include "bltNsUtil.h"
/*ARGSUSED*/
Tcl_Namespace *
Blt_GetCommandNamespace(Tcl_Command cmdToken)
{
Command *cmdPtr = (Command *)cmdToken;
return (Tcl_Namespace *)cmdPtr->nsPtr;
}
int
Blt_ParseObjectName(Tcl_Interp* interp, const char *path,
Blt_ObjectName *namePtr, unsigned int flags)
{
char *last, *colon;
namePtr->nsPtr = NULL;
namePtr->name = NULL;
colon = NULL;
/* Find the last namespace separator in the qualified name. */
last = (char *)(path + strlen(path));
while (--last > path) {
if ((*last == ':') && (*(last - 1) == ':')) {
last++; /* just after the last "::" */
colon = last - 2;
break;
}
}
if (colon == NULL) {
namePtr->name = path;
if ((flags & BLT_NO_DEFAULT_NS) == 0) {
namePtr->nsPtr = Tcl_GetCurrentNamespace(interp);
}
return TRUE; /* No namespace designated in name. */
}
/* Separate the namespace and the object name. */
*colon = '\0';
if (path[0] == '\0') {
namePtr->nsPtr = Tcl_GetGlobalNamespace(interp);
} else {
namePtr->nsPtr = Tcl_FindNamespace(interp, (char *)path, NULL,
(flags & BLT_NO_ERROR_MSG) ? 0 : TCL_LEAVE_ERR_MSG);
}
/* Repair the string. */ *colon = ':';
if (namePtr->nsPtr == NULL) {
return FALSE; /* Namespace doesn't exist. */
}
namePtr->name =last;
return TRUE;
}
char *
Blt_MakeQualifiedName(Blt_ObjectName *namePtr, Tcl_DString *resultPtr)
{
Tcl_DStringInit(resultPtr);
if ((namePtr->nsPtr->fullName[0] != ':') ||
(namePtr->nsPtr->fullName[1] != ':') ||
(namePtr->nsPtr->fullName[2] != '\0')) {
Tcl_DStringAppend(resultPtr, namePtr->nsPtr->fullName, -1);
}
Tcl_DStringAppend(resultPtr, "::", -1);
Tcl_DStringAppend(resultPtr, (char *)namePtr->name, -1);
return Tcl_DStringValue(resultPtr);
}
static Tcl_Namespace* NamespaceOfVariable(Var *varPtr)
{
if (varPtr->flags & VAR_IN_HASHTABLE) {
VarInHash *vhashPtr = (VarInHash *)varPtr;
TclVarHashTable *vtablePtr;
vtablePtr = (TclVarHashTable *)vhashPtr->entry.tablePtr;
return (Tcl_Namespace*)(vtablePtr->nsPtr);
}
return NULL;
}
/*
*---------------------------------------------------------------------------
*
* Blt_GetVariableNamespace --
*
* Returns the namespace context of the variable. If NULL, this
* indicates that the variable is local to the call frame.
*
* Results:
* Returns the context of the namespace in an opaque type.
*
*---------------------------------------------------------------------------
*/
Tcl_Namespace *
Blt_GetVariableNamespace(Tcl_Interp* interp, const char *path)
{
Blt_ObjectName objName;
if (!Blt_ParseObjectName(interp, path, &objName, BLT_NO_DEFAULT_NS)) {
return NULL;
}
if (objName.nsPtr == NULL) {
Var *varPtr;
varPtr = (Var *)Tcl_FindNamespaceVar(interp, (char *)path,
(Tcl_Namespace *)NULL,
TCL_GLOBAL_ONLY);
if (varPtr != NULL) {
return NamespaceOfVariable(varPtr);
}
}
return objName.nsPtr;
}
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