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Tcl_Namespace(3) Tcl Library Procedures Tcl_Namespace(3)
_________________________________________________________________________________________________
NAME
Tcl_AppendExportList, Tcl_CreateNamespace, Tcl_DeleteNamespace, Tcl_Export, Tcl_FindCom-
mand, Tcl_FindNamespace, Tcl_ForgetImport, Tcl_GetCurrentNamespace, Tcl_GetGlobalNames-
pace, Tcl_GetNamespaceUnknownHandler, Tcl_Import, Tcl_SetNamespaceUnknownHandler - manipu-
late namespaces
SYNOPSIS
#include <tcl.h>
Tcl_Namespace *
Tcl_CreateNamespace(interp, name, clientData, deleteProc)
Tcl_DeleteNamespace(nsPtr)
int
Tcl_AppendExportList(interp, nsPtr, objPtr)
int
Tcl_Export(interp, nsPtr, pattern, resetListFirst)
int
Tcl_Import(interp, nsPtr, pattern, allowOverwrite)
int
Tcl_ForgetImport(interp, nsPtr, pattern)
Tcl_Namespace *
Tcl_GetCurrentNamespace(interp)
Tcl_Namespace *
Tcl_GetGlobalNamespace(interp)
Tcl_Namespace *
Tcl_FindNamespace(interp, name, contextNsPtr, flags)
Tcl_Command
Tcl_FindCommand(interp, name, contextNsPtr, flags)
Tcl_Obj *
Tcl_GetNamespaceUnknownHandler(interp, nsPtr)
int
Tcl_SetNamespaceUnknownHandler(interp, nsPtr, handlerPtr)
ARGUMENTS
Tcl_Interp *interp (in/out) The interpreter in which the names-
pace exists and where name lookups
are performed. Also where error
result messages are written.
const char *name (in) The name of the namespace or command
to be created or accessed.
ClientData clientData (in) A context pointer by the creator of
the namespace. Not interpreted by
Tcl at all.
Tcl_NamespaceDeleteProc *deleteProc (in) A pointer to function to call when
the namespace is deleted, or NULL if
no such callback is to be performed.
Tcl_Namespace *nsPtr (in) The namespace to be manipulated, or
NULL (for other than Tcl_DeleteNames-
pace) to manipulate the current
namespace.
Tcl_Obj *objPtr (out) A reference to an unshared object to
which the function output will be
written.
const char *pattern (in) The glob-style pattern (see
Tcl_StringMatch) that describes the
commands to be imported or exported.
int resetListFirst (in) Whether the list of export patterns
should be reset before adding the
current pattern to it.
int allowOverwrite (in) Whether new commands created by this
import action can overwrite existing
commands.
Tcl_Namespace *contextNsPtr (in) The location in the namespace hierar-
chy where the search for a namespace
or command should be conducted rela-
tive to when the search term is not
rooted at the global namespace. NULL
indicates the current namespace.
int flags (in) OR-ed combination of bits controlling
how the search is to be performed.
The following flags are supported:
TCL_GLOBAL_ONLY (indicates that the
search is always to be conducted rel-
ative to the global namespace),
TCL_NAMESPACE_ONLY (just for
Tcl_FindCommand; indicates that the
search is always to be conducted rel-
ative to the context namespace), and
TCL_LEAVE_ERR_MSG (indicates that an
error message should be left in the
interpreter if the search fails.)
Tcl_Obj *handlerPtr (in) A script fragment to be installed as
the unknown command handler for the
namespace, or NULL to reset the han-
dler to its default.
_________________________________________________________________
DESCRIPTION
Namespaces are hierarchic naming contexts that can contain commands and variables. They
also maintain a list of patterns that describes what commands are exported, and can import
commands that have been exported by other namespaces. Namespaces can also be manipulated
through the Tcl command namespace.
The Tcl_Namespace structure encapsulates a namespace, and is guaranteed to have the fol-
lowing fields in it: name (the local name of the namespace, with no namespace separator
characters in it, with empty denoting the global namespace), fullName (the fully specified
name of the namespace), clientData, deleteProc (the values specified in the call to
Tcl_CreateNamespace), and parentPtr (a pointer to the containing namespace, or NULL for
the global namespace.)
Tcl_CreateNamespace creates a new namespace. The deleteProc will have the following type
signature:
typedef void (Tcl_NamespaceDeleteProc) (ClientData clientData);
Tcl_DeleteNamespace deletes a namespace.
Tcl_AppendExportList retrieves the export patterns for a namespace given namespace and
appends them (as list items) to objPtr.
Tcl_Export sets and appends to the export patterns for a namespace. Patterns are appended
unless the resetListFirst flag is true.
Tcl_Import imports commands matching a pattern into a namespace. Note that the pattern
must include the name of the namespace to import from. This function returns an error if
an attempt to import a command over an existing command is made, unless the allowOverwrite
flag has been set.
Tcl_ForgetImport removes imports matching a pattern.
Tcl_GetCurrentNamespace returns the current namespace for an interpreter.
Tcl_GetGlobalNamespace returns the global namespace for an interpreter.
Tcl_FindNamespace searches for a namespace named name within the context of the namespace
contextNsPtr. If the namespace cannot be found, NULL is returned.
Tcl_FindCommand searches for a command named name within the context of the namespace con-
textNsPtr. If the command cannot be found, NULL is returned.
Tcl_GetNamespaceUnknownHandler returns the unknown command handler for the namespace, or
NULL if none is set.
Tcl_SetNamespaceUnknownHandler sets the unknown command handler for the namespace. If han-
dlerPtr is NULL, then the handler is reset to its default.
SEE ALSO
Tcl_CreateCommand, Tcl_ListObjAppendElements, Tcl_SetVar
KEYWORDS
namespace, command
Tcl 8.5 Tcl_Namespace(3)
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On Apache
Under GNU General Public License
2024-04-19 14:48 @18.188.44.223 CrawledBy Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)